/// Framework Core Low-Level JSON Processing
// - this unit is a part of the Open Source Synopse mORMot framework 2,
// licensed under a MPL/GPL/LGPL three license - see LICENSE.md
unit mormot.core.json;

{
  *****************************************************************************

   JSON functions shared by all framework units
    - Low-Level JSON Processing Functions
    - TJsonWriter class with proper JSON escaping and WriteObject() support
    - JSON-aware TSynNameValue TSynPersistentStoreJson
    - JSON-aware TSynDictionary Storage
    - JSON Unserialization for any kind of Values
    - JSON Serialization Wrapper Functions
    - Abstract Classes with Auto-Create-Fields

  *****************************************************************************
}

interface

{$I mormot.defines.inc}

uses
  classes,
  contnrs,
  sysutils,
  {$ifdef ISDELPHI}
  typinfo, // for proper Delphi inlining
  {$endif ISDELPHI}
  mormot.core.base,
  mormot.core.os,
  mormot.core.unicode,
  mormot.core.text,
  mormot.core.datetime,
  mormot.core.rtti,
  mormot.core.buffers,
  mormot.core.data;


{ ********** Low-Level JSON Processing Functions }

type
  /// exception raised by this unit, in relation to raw JSON process
  EJsonException = class(ESynException);

  /// kind of first character used from JSON_TOKENS[] for efficient JSON parsing
  TJsonToken = (
    jtNone,
    jtDoubleQuote,
    jtFirstDigit,
    jtNullFirstChar,
    jtTrueFirstChar,
    jtFalseFirstChar,
    jtObjectStart,
    jtArrayStart,
    jtObjectStop,
    jtArrayStop,
    jtAssign,
    jtComma,
    jtSingleQuote,
    jtEqual,
    jtIdentifierFirstChar,
    jtSlash,
    jtEndOfBuffer);

  /// defines a lookup table used for branch-less first char JSON parsing
  TJsonTokens = array[AnsiChar] of TJsonToken;
  /// points to a lookup table used for branch-less first char JSON parsing
  PJsonTokens = ^TJsonTokens;

  /// kind of character used from JSON_CHARS[] for efficient JSON parsing
  // - using such a set compiles into TEST [MEM], IMM so is more efficient
  // than a regular set of AnsiChar which generates much slower BT [MEM], IMM
  // - the same 256-byte memory will also be reused from L1 CPU cache
  // during the parsing of complex JSON input
  // - TTestCoreProcess.JSONBenchmark shows around 900MB/s on my i5 notebook
  TJsonChar = set of (
    jcJsonIdentifierFirstChar,
    jcJsonIdentifier,
    jcEndOfJsonFieldOr0,
    jcEndOfJsonFieldNotName,
    jcEndOfJsonValueField,
    jcJsonStringMarker,
    jcDigitFirstChar,
    jcDigitFloatChar);

  /// defines a lookup table used for branch-less JSON parsing
  TJsonCharSet = array[AnsiChar] of TJsonChar;
  /// points to a lookup table used for branch-less JSON parsing
  PJsonCharSet = ^TJsonCharSet;

const
  /// JSON_ESCAPE[] lookup value: indicates no escape needed
  JSON_ESCAPE_NONE = 0;
  /// JSON_ESCAPE[] lookup value: indicates #0 (end of string)
  JSON_ESCAPE_ENDINGZERO = 1;
  /// JSON_ESCAPE[] lookup value: should be escaped as \u00xx
  JSON_ESCAPE_UNICODEHEX = 2;

  /// JSON_UNESCAPE[] lookup value: indicates #0 or unexpected control char
  JSON_UNESCAPE_UNEXPECTED = #0;
  /// JSON_UNESCAPE[] lookup value: indicates '\u0123' UTF-16 pattern
  JSON_UNESCAPE_UTF16 = #1;

var
  /// 256-byte lookup table for fast branchless initial character JSON parsing
  JSON_TOKENS: TJsonTokens;
  /// 256-byte lookup table for fast branchless JSON parsing
  // - to be used e.g. as:
  // ! if jvJsonIdentifier in JSON_CHARS[P^] then ...
  JSON_CHARS: TJsonCharSet;
  /// 256-byte lookup table for fast branchless JSON text escaping
  // - 0 = JSON_ESCAPE_NONE indicates no escape needed
  // - 1 = JSON_ESCAPE_ENDINGZERO indicates #0 (end of string)
  // - 2 = JSON_ESCAPE_UNICODEHEX should be escaped as \u00xx
  // - b,t,n,f,r,\," as escaped character for #8,#9,#10,#12,#13,\,"
  JSON_ESCAPE: array[byte] of byte;

  /// 256-byte lookup table for fast branchless JSON text un-escaping
  // - #0 = JSON_UNESCAPE_UNEXPECTED for unexpected #0 or control char
  // - #1 = JSON_UNESCAPE_UTF16 for '\u0123' UTF-16 pattern
  // - #8,#9,#10,#12,#13 as unescaped char from b,t,n,f,r
  // - other characters are litterals and should be written as such
  JSON_UNESCAPE: array[AnsiChar] of AnsiChar;

  /// how many initial chars of a JSON array are parsed for intial capacity
  // - used e.g. by _JL_DynArray() and TDocVariantData.InitJsonInPlace()
  // - 64KB was found out empirically as a good value - but you can tune it
  JSON_PREFETCH: integer = 65536;

/// returns TRUE if the given text buffers would be escaped when written as JSON
// - e.g. if contains " or \ characters, as defined by
// http://www.ietf.org/rfc/rfc4627.txt
function NeedsJsonEscape(const Text: RawUtf8): boolean; overload;

/// returns TRUE if the given text buffers would be escaped when written as JSON
// - e.g. if contains " or \ characters, as defined by
// http://www.ietf.org/rfc/rfc4627.txt
function NeedsJsonEscape(P: PUtf8Char): boolean; overload;

/// returns TRUE if the given text buffers would be escaped when written as JSON
// - e.g. if contains " or \ characters, as defined by
// http://www.ietf.org/rfc/rfc4627.txt
function NeedsJsonEscape(P: PUtf8Char; PLen: integer): boolean; overload;
  {$ifdef HASINLINE}inline;{$endif}

/// UTF-8 decode one or two \u#### JSON escaped codepoints into Dest
// - P^ should point at 'u1234' just after \u1234
// - return ending P position, maybe after another \u#### UTF-16 surrogate char
function JsonUnicodeEscapeToUtf8(var D: PUtf8Char; P: PUtf8Char): PUtf8Char;
//  {$ifdef HASINLINE}inline;{$endif}

/// ensure all UTF-8 Unicode glyphs are escaped as \u#### UTF-16 JSON
// - this will work at raw UTF-8 text level: if your input is true JSON,
// consider using JsonReformat(s, jsonEscapeUnicode) instead
function JsonUnicodeEscape(const s: RawUtf8): RawUtf8;

/// ensure all \u#### UTF-16 JSON are decoded into plain UTF-8 content
// - this will work at raw UTF-8 text level: if your input is true JSON,
// consider using JsonReformat(s, jsonNoEscapeUnicode) instead
function JsonUnicodeUnEscape(const s: RawUtf8): RawUtf8;

/// encode one \u#### JSON escaped UTF-16 codepoint into Dest
procedure Utf16ToJsonUnicodeEscape(var B: PUtf8Char; c: PtrUint; tab: PByteToWord);
  {$ifdef HASINLINE} inline; {$endif}

/// test if the supplied buffer is a "string" value or a numerical value
// (floating point or integer), according to the characters within
// - this version will recognize null/false/true as strings
// - e.g. IsString('0')=false, IsString('abc')=true, IsString('null')=true
function IsString(P: PUtf8Char): boolean;

/// test if the supplied buffer is a "string" value or a numerical value
// (floating or integer), according to the JSON encoding schema
// - this version will NOT recognize JSON null/false/true as strings
// - e.g. IsStringJson('0')=false, IsStringJson('abc')=true,
// but IsStringJson('null')=false
// - will follow the JSON definition of number, i.e. '0123' is a string (i.e.
// '0' is excluded at the begining of a number) and '123' is not a string
function IsStringJson(P: PUtf8Char): boolean;

/// test if the supplied text buffer seems to be a correct (extended) JSON value
// - will allow comments and extended MongoDB JSON syntax unless Strict=true
// - numbers, escaped strings and commas are wild guessed, for performance
function IsValidJson(P: PUtf8Char; len: PtrInt; strict: boolean = false): boolean; overload;

/// test if the supplied text seems to be a correct (extended) JSON value
// - will allow comments and extended MongoDB JSON syntax unless Strict=true
// - numbers, escaped strings and commas are wild guessed, for performance
function IsValidJson(const s: RawUtf8; strict: boolean = false): boolean; overload;

/// test if the supplied #0 ended buffer is a correct (extended) JSON value
// - will allow comments and extended MongoDB JSON syntax unless Strict=true
// - numbers, escaped strings and commas are wild guessed, for performance
function IsValidJsonBuffer(P: PUtf8Char; strict: boolean = false): boolean;

/// returns the JSON type of a supplied #0 ended buffer
// - will move to the first non-space char, then returns its JSON_TOKENS[] value
// - for valid JSON, is likely to return jtDoubleQuote, jtFirstDigit,
// jtNullFirstChar, jtTrueFirstChar, jtFalseFirstChar, jtObjectStart or jtArrayStart
function GetFirstJsonToken(P: PUtf8Char): TJsonToken;

/// validate the supplied #0 ended buffer and returns its JSON type
// - on parsing error, returns P=nil and jtNone
// - will move P to the next JSON item, and return the JSON token kind, e.g.
// jtArrayStart, jtObjectStart, jtDoubleQuote or jtFirstDigit
// - will allow comments and extended MongoDB JSON syntax unless Strict=true
// - optionally return the number of nested items for jtArrayStart/jtObjectStart
function GetNextJsonToken(var P: PUtf8Char; strict: boolean = false;
  DocCount: PInteger = nil): TJsonToken;

/// simple method to go after the next ',' character
procedure IgnoreComma(var P: PUtf8Char);
  {$ifdef HASINLINE}inline;{$endif}

/// returns TRUE if the given text buffer contains simple characters as
// recognized by JSON extended syntax
// - follow GetJsonPropName and GotoNextJsonObjectOrArray expectations
function JsonPropNameValid(P: PUtf8Char): boolean;
  {$ifdef HASINLINE}inline;{$endif}

type
  /// efficient JSON value parser / in-place decoder
  // - as used by JsonDecode() and all internal JSON functions
  {$ifdef USERECORDWITHMETHODS}
  TGetJsonField = record
  {$else}
  TGetJsonField = object
  {$endif USERECORDWITHMETHODS}
  public
    /// input/output JSON parsing buffer address
    Json: PUtf8Char;
    /// in-place output parsed JSON value, unescaped and #0 terminated
    // - see associated WasString to find out its actual type
    Value: PUtf8Char;
    /// in-place output parsed JSON value length
    ValueLen: integer;
    /// set if the value was actually a JSON string
    // - "strings" are decoded as 'strings', with WasString=true, properly JSON
    // unescaped (e.g. any \u0123 pattern would be converted into UTF-8 content)
    // - numbers are decoded as text, e.g. '1.234', with WasString=false
    // - null is decoded as Value=nil and WasString=false
    // - true/false are decoded as 'true'/'false' with WasString=false
    WasString: boolean;
    /// the ',' ':' or '}' separator just after the Value
    // - may have been overwritten with a #0 termination in the input buffer
    EndOfObject: AnsiChar;
    /// decode a JSON field value in-place from an UTF-8 encoded text buffer
    // - warning: will decode in the Json buffer memory itself (no memory copy
    // nor allocation), for faster process - so take care that it is not shared
    // - Value/ValueLen/WasString is set with the parsed value
    // - EndOfObject is set to the JSON ending char (',' ':' or '}' e.g.)
    // - Json points to the next field to be decoded, or nil on parsing error
    procedure GetJsonField;
    /// decode a JSON 64-bit integer value from an UTF-8 encoded text buffer
    function GetJsonInt64: Int64;
      {$ifdef HASINLINE} inline; {$endif}
    /// decode a JSON field value in-place into a RawUtf8 string
    procedure GetJsonValue(var Text: RawUtf8);
    /// decode a JSON content from an UTF-8 encoded buffer
    // - GetJsonField will only handle JSON "strings" or numbers - if
    // HandleValuesAsObjectOrArray is TRUE, this function will process JSON {
    // objects } or [ arrays ] and add a #0 at the end of it
    // - warning: will decode in the Json buffer memory itself (no memory
    // allocation or copy), for faster process - so take care that it is not shared
    // - Value/ValueLen/WasString is set with the parsed JSON value
    // - EndOfObject is set to the JSON ending char (',' ':' or '}' e.g.)
    // - Json points to the next value to be decoded, or nil on parsing error
    procedure GetJsonFieldOrObjectOrArray(
      HandleValuesAsObjectOrArray: boolean = true; NormalizeBoolean: boolean = true);
  end;

{$ifndef PUREMORMOT2}
/// decode a JSON field value in-place from an UTF-8 encoded text buffer
// - compatibility wrapper around TGetJsonField.GetJsonField method
function GetJsonField(P: PUtf8Char; out PDest: PUtf8Char;
  WasString: PBoolean = nil; EndOfObject: PUtf8Char = nil;
  Len: PInteger = nil): PUtf8Char;
  {$ifdef HASINLINE} inline; {$endif}

/// decode a JSON content from an UTF-8 encoded buffer
// - compatibility wrapper around TGetJsonField.GetJsonFieldOrObjectOrArray
function GetJsonFieldOrObjectOrArray(var Json: PUtf8Char;
  WasString: PBoolean = nil; EndOfObject: PUtf8Char = nil;
  HandleValuesAsObjectOrArray: boolean = false;
  NormalizeBoolean: boolean = true; Len: PInteger = nil): PUtf8Char;
  {$ifdef HASINLINE} inline; {$endif}
{$endif PUREMORMOT2}

/// decode a JSON field name in an UTF-8 encoded buffer
// - this function decodes in the P^ buffer memory itself (no memory allocation
// or copy), for faster process - so take care that P^ is not shared
// - it will return the property name, with an ending #0, and "..." content
// properly unescaped unless NoJsonUnescape is set to true
// - returns nil on error
// - this function will handle strict JSON property name (i.e. a "string"), but
// also MongoDB extended syntax, e.g. {age:{$gt:18}} or {'people.age':{$gt:18}}
// see @http://docs.mongodb.org/manual/reference/mongodb-extended-json
function GetJsonPropName(var Json: PUtf8Char; Len: PInteger = nil;
  NoJsonUnescape: boolean = false): PUtf8Char;

/// decode a JSON field name in an UTF-8 encoded ShortString variable
// - this function would left the P^ buffer memory untouched, so may be safer
// than the overloaded GetJsonPropName() function in some cases
// - it will return the property name as a local UTF-8 encoded ShortString,
// or PropName='' on error
// - this function won't unescape the property name, as strict JSON (i.e. a "st\"ring")
// - but it will handle MongoDB syntax, e.g. {age:{$gt:18}} or {'people.age':{$gt:18}}
// see @http://docs.mongodb.org/manual/reference/mongodb-extended-json
procedure GetJsonPropNameShort(var P: PUtf8Char; out PropName: ShortString);

/// decode a JSON object or array from an UTF-8 encoded buffer
// - as called by GetJsonFieldOrObjectOrArray() for HandleValuesAsObjectOrArray
// - return the position of the next JSON item (with EndOfObject and optionally
// Len^ properly set) or nil on parsing error
function GetJsonObjectOrArray(P: PUtf8Char;
  EndOfObject: PUtf8Char; Len: PInteger = nil): PUtf8Char;

/// retrieve the next JSON item as a RawJson undecoded variable
// - P buffer can be either any JSON item, i.e. a string, a number or even a
// JSON array (ending with ]) or a JSON object (ending with })
// - EndOfObject (if not nil) is set to the JSON value end char (',' ':' or '}')
// - input buffer is not modified in-place, since result is directly copied
procedure GetJsonItemAsRawJson(var P: PUtf8Char; var result: RawJson;
  EndOfObject: PAnsiChar = nil);

/// retrieve the next JSON item as a RawUtf8 decoded buffer
// - P buffer can be either any JSON item, i.e. a string, a number or even a
// JSON array (ending with ]) or a JSON object (ending with })
// - EndOfObject (if not nil) is set to the JSON value end char (',' ':' or '}')
// - just calls TGetJsonField, and create a new RawUtf8 from the returned value,
// after proper string unescape (with WasString^=true)
// - warning: input buffer is modified in-place during output value parsing
function GetJsonItemAsRawUtf8(var P: PUtf8Char; var output: RawUtf8;
  WasString: PBoolean = nil; EndOfObject: PUtf8Char = nil): boolean;

/// get the next character after a quoted buffer
// - the first character in P^ must be "
// - it will return the latest " position, ignoring \" within
// - caller should check that return PUtf8Char is indeed a "
function GotoEndOfJsonString(P: PUtf8Char): PUtf8Char;

/// reach position just after the current JSON string in the supplied UTF-8 buffer
// - will first ensure that P^='"' then process like GotoEndJsonItem()
function GotoEndJsonItemString(P: PUtf8Char): PUtf8Char;

/// reach position just after the current JSON item in the supplied UTF-8 buffer
// - buffer can be either any JSON item, i.e. a string, a number or even a
// JSON array (ending with ]) or a JSON object (ending with })
// - returns nil if the specified buffer is not valid JSON content
// - returns the position in buffer just after the item excluding the separator
// character - i.e. result^ may be ',','}',']'
// - will allow comments and extended MongoDB JSON syntax - use
// GotoEndJsonItemStrict() if you expect a more standard JSON parsing
function GotoEndJsonItem(P: PUtf8Char; PMax: PUtf8Char = nil): PUtf8Char;

/// reach position just after the current JSON item in the supplied UTF-8 buffer
// - in respect to GotoEndJsonItem(), this function will validate for strict
// JSON simple values, i.e. real numbers or only true/false/null constants,
// and refuse commens or MongoDB extended syntax like {age:{$gt:18}}
// - numbers and escaped strings are not fully validated, just their charset
function GotoEndJsonItemStrict(P: PUtf8Char; PMax: PUtf8Char = nil): PUtf8Char;

/// reach the position of the next JSON item(s) in the supplied UTF-8 buffer
// - buffer can be either any JSON item, i.e. a string, a number or even a
// JSON array (ending with ]) or a JSON object (ending with })
// - returns nil if the specified number of items is not available in buffer
// - returns the position in buffer after the item including the separator
// character (optionally in EndOfObject) - i.e. result will be at the start of
// the next object, and EndOfObject may be ',','}',']'
function GotoNextJsonItem(P: PUtf8Char; NumberOfItemsToJump: cardinal = 1;
  EndOfObject: PAnsiChar = nil; PMax: PUtf8Char = nil;
  Strict: boolean = false): PUtf8Char; overload;

/// reach the position of the next JSON item in the supplied UTF-8 buffer
// - similar to the GotoNextJsonItem() with NumberOfItemsToJump=1
function GotoNextJsonItem(P: PUtf8Char; var EndOfObject: AnsiChar): PUtf8Char; overload;
  {don't inline to reduce the stack size of the caller function}

/// search the EndOfObject of a JSON buffer, just like TGetJsonField does
function ParseEndOfObject(P: PUtf8Char; out EndOfObject: AnsiChar): PUtf8Char;
  {$ifdef HASINLINE}inline;{$endif}

/// compute the number of elements of a JSON array
// - this will handle any kind of arrays, including those with nested
// JSON objects or arrays
// - incoming P^ should point to the first char AFTER the initial '[' (which
// may be a closing ']')
// - returns 0 if the supplied input is invalid, or the number of identified
// items in the JSON array buffer
// - if PMax is set, will abort after this position, and return the current
// counted number of items as negative, which could be used as initial allocation
// before the loop - typical use in this case is e.g.
// ! cap := abs(JsonArrayCount(P, P + JSON_PREFETCH));
// - some performance numbers on a Core i5-13400:
// $     JsonArrayCount(P) in 10.95ms i.e. 14.3M/s, 1.7 GB/s
// $     JsonArrayCount(P,PMax) in 11.05ms i.e. 14.1M/s, 1.7 GB/s
function JsonArrayCount(P: PUtf8Char; PMax: PUtf8Char = nil;
  Strict: boolean = false): integer;

/// go to the #nth item of a JSON array
// - implemented via a fast SAX-like approach: the input buffer is not changed,
// nor no memory buffer allocated neither content copied
// - returns nil if the supplied index is out of range
// - returns a pointer to the index-nth item in the JSON array (first index=0)
// - this will handle any kind of arrays, including those with nested
// JSON objects or arrays
// - incoming P^ should point to the first initial '[' char
function JsonArrayItem(P: PUtf8Char; Index: integer): PUtf8Char;

/// retrieve the positions of all elements of a JSON array
// - this will handle any kind of arrays, including those with nested
// JSON objects or arrays
// - warning: incoming P^ should point to the first char AFTER the initial '['
// (which may be a closing ']') - calling e.g. NextNotSpaceCharIs()
// - returns false if the supplied input is invalid
// - returns true on success, with Values[] pointing to each unescaped value,
// may be a JSON string, object, array of constant
function JsonArrayDecode(P: PUtf8Char;
  out Values: TPUtf8CharDynArray): boolean;

/// compute the number of fields in a JSON object
// - this will handle any kind of objects, including those with nested JSON
// documents, and also comments or MongoDB extended syntax (unless Strict=true)
// - warning: incoming P^ should point to the first char AFTER the initial '{'
// (which may be a closing '}')
// - will abort if P reaches PMax (if not nil), and return the current counted
// number of items as negative, which could be used as initial allocation before
// a parsing loop - typical use in this case is e.g.
// ! cap := abs(JsonObjectPropCount(P, P + JSON_PREFETCH));
function JsonObjectPropCount(P: PUtf8Char; PMax: PUtf8Char = nil;
  Strict: boolean = false): PtrInt;

/// go to a named property of a JSON object
// - implemented via a fast SAX-like approach: the input buffer is not changed,
// nor no memory buffer allocated neither content copied
// - PropName is search case-insensitively  as 'propertyname' or 'property*'
// - returns nil if the supplied property name does not exist
// - returns a pointer to the matching item value in the JSON object
// - this will handle any kind of objects, including those with nested
// JSON objects or arrays
// - incoming P^ should point to the first initial '{' char
function JsonObjectItem(P: PUtf8Char; const PropName: RawUtf8;
  PropNameFound: PRawUtf8 = nil): PUtf8Char; overload;

/// go to a buffer-named property of a JSON object
// - as called by overloaded JsonObjectItem()
function JsonObjectItem(P: PUtf8Char; PropName: PUtf8Char; PropNameLen: PtrInt;
  PropNameFound: PRawUtf8): PUtf8Char; overload;

/// go to a property of a JSON object, by its full path, e.g. 'parent.child'
// - implemented via a fast SAX-like approach: the input buffer is not changed,
// nor no memory buffer allocated neither content copied
// - PropPath is search case-insensitively as 'parent.child' or 'parent.ch*'
// - returns nil if the supplied property path does not exist
// - returns a pointer to the matching item value in the JSON object
// - this will handle any kind of objects, including those with nested
// JSON objects or arrays
// - incoming P^ should point to the first initial '{' char
function JsonObjectByPath(JsonObject, PropPath: PUtf8Char): PUtf8Char;

/// return all matching properties of a JSON object
// - here the PropPath could be a comma-separated list of case-insensitive full
// paths, e.g. 'Prop1,Prop2' or 'Obj1.Obj2.Prop*,Obj1.Prop1'
// - returns '' if no property did match
// - returns a JSON object of all matching properties
// - this will handle any kind of objects, including those with nested
// JSON objects or arrays
// - incoming P^ should point to the first initial '{' char
function JsonObjectsByPath(JsonObject, PropPath: PUtf8Char): RawUtf8;

/// convert one JSON object into two JSON arrays of keys and values
// - i.e. makes the following transformation:
// $ {key1:value1,key2,value2...} -> [key1,key2...] + [value1,value2...]
// - this function won't allocate any memory during its process, nor
// modify the JSON input buffer
// - is the reverse of the TJsonWriter.AddJsonArraysAsJsonObject() method
// - used e.g. by TSynDictionary.LoadFromJson
// - returns the number of items parsed and stored into keys/values, -1 on
// error parsing the input JSON buffer
function JsonObjectAsJsonArrays(Json: PUtf8Char;
  out keys, values: RawUtf8): integer;

/// remove comments and trailing commas from a text buffer before passing
// it to a JSON parser
// - handle two types of comments: starting from // till end of line
// or /* ..... */ blocks anywhere in the text content
// - trailing commas is replaced by ' ', so resulting JSON is valid for parsers
// what not allows trailing commas (browsers for example)
// - may be used to prepare configuration files before loading;
// for example we store server configuration in file config.json and
// put some comments in this file then code for loading is:
// !var
// !  cfg: RawUtf8;
// ! ...
// !  cfg := StringFromFile(Executable.ProgramFilePath + 'config.json');
// !  RemoveCommentsFromJson(@cfg[1]);
// !  pLastChar := JsonToObject(obj, pointer(cfg), isvalid);
procedure RemoveCommentsFromJson(P: PUtf8Char); overload;

/// remove comments from a text buffer before passing it to JSON parser
// - won't remove the comments in-place, but allocate a new string
function RemoveCommentsFromJson(const s: RawUtf8): RawUtf8; overload;

/// helper to retrieve the bit mapped integer value of a set from its JSON text
// - Names and MaxValue should be retrieved from RTTI
// - if supplied P^ is a JSON integer number, will read it directly
// - if P^ maps some ["item1","item2"] content, would fill all matching bits
// - if P^ contains ['*'], would fill all bits
// - returns P=nil if reached prematurely the end of content, or returns
// the value separator (e.g. , or }) in EndOfObject (like GetJsonField)
function GetSetNameValue(Names: PShortString; MinValue, MaxValue: integer;
  var P: PUtf8Char; out EndOfObject: AnsiChar): QWord; overload;

/// helper to retrieve the bit mapped integer value of a set from its JSON text
// - overloaded function using the RTTI
function GetSetNameValue(Info: PRttiInfo;
  var P: PUtf8Char; out EndOfObject: AnsiChar): QWord; overload;

/// retrieve a pointer to JSON string field content, without unescaping it
// - returns either ':' for name field, or } , for value field
// - returns nil on JSON content error
// - this function won't touch the JSON buffer, so you can call it before
// using in-place escape process via JsonDecode() or TGetJsonField
function JsonRetrieveStringField(P: PUtf8Char; out Field: PUtf8Char;
  out FieldLen: integer; ExpectNameField: boolean): PUtf8Char;
  {$ifdef HASINLINE}inline;{$endif}

/// retrieve a class Rtti, as saved by ObjectToJson(...,[...,woStoreClassName,...]);
// - JSON input should be either 'null', either '{"ClassName":"TMyClass",...}'
// - calls IdemPropName/JsonRetrieveStringField so input buffer won't be
// modified, but caller should ignore this "ClassName" property later on
// - the corresponding class shall have been previously registered by
// Rtti.RegisterClass(), in order to retrieve the class type from it name -
// or, at least, by the RTL Classes.RegisterClass() function, if AndGlobalFindClass
// parameter is left to default true so that RTL Classes.FindClass() is called
function JsonRetrieveObjectRttiCustom(var Json: PUtf8Char;
  AndGlobalFindClass: boolean): TRttiCustom;

/// encode a JSON object UTF-8 buffer into URI parameters
// - you can specify property names to ignore during the object decoding
// - you can omit the leading query delimiter ('?') by setting IncludeQueryDelimiter=false
// - warning: the ParametersJson input buffer will be modified in-place
function UrlEncodeJsonObject(const UriName: RawUtf8; ParametersJson: PUtf8Char;
  const PropNamesToIgnore: array of RawUtf8;
  IncludeQueryDelimiter: boolean = true): RawUtf8; overload;

/// encode a JSON object UTF-8 buffer into URI parameters
// - you can specify property names to ignore during the object decoding
// - you can omit the leading query delimiter ('?') by setting IncludeQueryDelimiter=false
// - overloaded function which will make a copy of the input JSON before parsing
function UrlEncodeJsonObject(const UriName, ParametersJson: RawUtf8;
  const PropNamesToIgnore: array of RawUtf8;
  IncludeQueryDelimiter: boolean = true): RawUtf8; overload;


/// formats and indents a JSON array or document to the specified layout
// - just a wrapper around TJsonWriter.AddJsonReformat() method
// - WARNING: the JSON buffer is decoded in-place, so P^ WILL BE modified
procedure JsonBufferReformat(P: PUtf8Char; out result: RawUtf8;
  Format: TTextWriterJsonFormat = jsonHumanReadable);

/// formats and indents a JSON array or document to the specified layout
// - just a wrapper around TJsonWriter.AddJsonReformat, making a private
// of the supplied JSON buffer (so that JSON content  would stay untouched)
function JsonReformat(const Json: RawUtf8;
  Format: TTextWriterJsonFormat = jsonHumanReadable): RawUtf8;

/// formats and indents a JSON array or document as a file
// - just a wrapper around TJsonWriter.AddJsonReformat() method
// - WARNING: the JSON buffer is decoded in-place, so P^ WILL BE modified
function JsonBufferReformatToFile(P: PUtf8Char; const Dest: TFileName;
  Format: TTextWriterJsonFormat = jsonHumanReadable): boolean;

/// formats and indents a JSON array or document as a file
// - just a wrapper around TJsonWriter.AddJsonReformat, making a private
// of the supplied JSON buffer (so that JSON content  would stay untouched)
function JsonReformatToFile(const Json: RawUtf8; const Dest: TFileName;
  Format: TTextWriterJsonFormat = jsonHumanReadable): boolean;


/// convert UTF-8 content into a JSON string
// - with proper escaping of the content, and surounding " characters
procedure QuotedStrJson(const aText: RawUtf8; var result: RawUtf8;
  const aPrefix: RawUtf8 = ''; const aSuffix: RawUtf8 = ''); overload;
  {$ifdef HASINLINE}inline;{$endif}

/// convert UTF-8 buffer into a JSON string
// - with proper escaping of the content, and surounding " characters
procedure QuotedStrJson(P: PUtf8Char; PLen: PtrInt; var result: RawUtf8;
  const aPrefix: RawUtf8 = ''; const aSuffix: RawUtf8 = ''); overload;

/// convert UTF-8 content into a JSON string
// - with proper escaping of the content, and surounding " characters
function QuotedStrJson(const aText: RawUtf8): RawUtf8; overload;
  {$ifdef HASINLINE}inline;{$endif}

const
  FIELDCOUNT_PATTERN: PUtf8Char = '{"fieldCount":'; // PatternLen = 14 chars
  ROWCOUNT_PATTERN: PUtf8Char   = ',"rowCount":';   // PatternLen = 12 chars
  VALUES_PATTERN: PUtf8Char     = ',"values":[';    // PatternLen = 11 chars

/// quickly check if an UTF-8 buffer start with the supplied Pattern
// - PatternLen is at least 8 bytes long, typically FIELDCOUNT_PATTERN,
// ROWCOUNT_PATTERN or VALUES_PATTERN constants
// - defined here for TDocVariantData.InitArrayFromResults
function Expect(var P: PUtf8Char; Pattern: PUtf8Char; PatternLen: PtrInt): boolean;
  {$ifdef HASINLINE}inline;{$endif}

/// parse JSON content in not-expanded format
// - i.e. stored as
// $ {"fieldCount":2,"values":["f1","f2","1v1",1v2,"2v1",2v2...],"rowCount":20}
// - search and extract "fieldCount" and "rowCount" field information
// - defined here for TDocVariantData.InitArrayFromResults
function IsNotExpandedBuffer(var P: PUtf8Char; PEnd: PUtf8Char;
  var FieldCount, RowCount: PtrInt): boolean;

/// efficient retrieval of the number of rows in non-expanded layout
// - search for "rowCount": at the end of the JSON buffer
function NotExpandedBufferRowCountPos(P, PEnd: PUtf8Char): PUtf8Char;

/// low-level prepare GetFieldCountExpanded() parsing returning '{' or ']'
function GotoFieldCountExpanded(P: PUtf8Char): PUtf8Char;

/// low-level parsing of the first expanded JSON object to guess fields count
function GetFieldCountExpanded(P: PUtf8Char): integer;

/// fast Format() function replacement, handling % and ? parameters
// - call rather FormatSql() and FormatJson() wrappers instead
// - resulting string has no length limit and uses fast concatenation
// - any supplied TObject instance will be written as their class name
procedure FormatParams(const Format: RawUtf8; const Args, Params: array of const;
  JsonFormat: boolean; var Result: RawUtf8);

/// fast Format() function replacement, handling % but also ? inlined parameters
// - will include Args[] for every % in Format
// - will include Params[] for every ? in Format, as "inlined" ORM or DB values,
// e.g. :(1234): for numbers, and  :('quoted '' string'): for text
// - note that, due to a Delphi compiler limitation, cardinal values should be
// type-casted to Int64() (otherwise the integer mapped value will be converted)
// - is a wrapper around FormatParams(Format, Args, Params, false, result);
function FormatSql(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8;

/// fast Format() function replacement, handling % but also ? parameters as JSON
// - will include Args[] for every % in Format
// - will include Params[] for every ? in Format, as their JSON value, with
// proper JSON double quotes and escaping for strings
// - note that, due to a Delphi compiler limitation, cardinal values should be
// type-casted to Int64() (otherwise the integer mapped value will be converted)
// - is a wrapper around FormatParams(Format, Args, Params, true, result);
function FormatJson(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8;

{$ifndef PUREMORMOT2} // rather call FormatSql() and FormatJson() functions
function FormatUtf8(const Format: RawUtf8; const Args, Params: array of const;
  JsonFormat: boolean = false): RawUtf8; overload;
{$endif PUREMORMOT2}


{ ********** TJsonWriter class with proper JSON escaping and WriteObject() support }

type
  /// JSON-capable TTextWriter/TTextDateWriter inherited class
  // - in addition to TTextWriter/TTextDateWriter, will handle JSON
  // serialization of any kind of value, including records, classes or arrays
  TJsonWriter = class(TTextDateWriter)
  protected
    // used by AddCRAndIndent for enums, sets and T*ObjArray comment of values
    fBlockComment: RawUtf8;
    // used by WriteObjectAsString/AddDynArrayJsonAsString methods
    fInternalJsonWriter: TJsonWriter;
    procedure InternalAddFixedAnsi(Source: PAnsiChar; SourceChars: cardinal;
      AnsiToWide: PWordArray; Escape: TTextWriterKind);
    // called after TRttiCustomProp.GetValueDirect/GetValueGetter
    procedure AddRttiVarData(const Value: TRttiVarData; Escape: TTextWriterKind;
      WriteOptions: TTextWriterWriteObjectOptions);
  public
    /// release all internal structures
    destructor Destroy; override;
    /// gives access to a temporary TJsonWriter
    // - returned instance is owned by this TJsonWriter, and voided
    // - may be used to escape some JSON espaced value (i.e. escape it twice),
    // in conjunction with AddJsonEscape(Source: TJsonWriter)
    function GetTempJsonWriter: TJsonWriter;
    /// append '[' or '{' with proper indentation
    procedure BlockBegin(Starter: AnsiChar; Options: TTextWriterWriteObjectOptions);
      {$ifdef HASINLINE}inline;{$endif}
    /// append ',' with proper indentation
    // - warning: this will break CancelLastComma, since CRLF+tabs are added
    procedure BlockAfterItem(Options: TTextWriterWriteObjectOptions);
      {$ifdef HASINLINE}inline;{$endif}
    /// append ']' or '}' with proper indentation
    procedure BlockEnd(Stopper: AnsiChar; Options: TTextWriterWriteObjectOptions);
      {$ifdef HASINLINE}inline;{$endif}
    /// used internally by WriteObject() when serializing a published property
    // - will call AddCRAndIndent then append "PropName":
    procedure WriteObjectPropNameHumanReadable(PropName: PUtf8Char; PropNameLen: PtrInt);
    /// used internally by WriteObject() when serializing a published property
    // - will call AddCRAndIndent then append "PropName":
    procedure WriteObjectPropNameShort(const PropName: ShortString;
      Options: TTextWriterWriteObjectOptions);
      {$ifdef HASINLINE}inline;{$endif}
    /// same as WriteObject(), but will double all internal " and bound with "
    // - this implementation will avoid most memory allocations
    procedure WriteObjectAsString(Value: TObject;
      Options: TTextWriterWriteObjectOptions = [woDontStoreDefault]);
    /// same as AddDynArrayJson(), but will double all internal " and bound with "
    // - this implementation will avoid most memory allocations
    procedure AddDynArrayJsonAsString(aTypeInfo: PRttiInfo; var aValue;
      WriteOptions: TTextWriterWriteObjectOptions = []);
    /// append a JSON field name, followed by an escaped UTF-8 JSON String and
    // a comma (',')
    procedure AddPropJsonString(const PropName: ShortString; const Text: RawUtf8);
    /// append CR+LF (#13#10) chars and #9 indentation
    // - will also flush any fBlockComment
    procedure AddCRAndIndent; override;
    /// write some #0 ended UTF-8 text, according to the specified format
    // - if Escape is a constant, consider calling directly AddNoJsonEscape,
    // AddJsonEscape or AddOnSameLine methods
    procedure Add(P: PUtf8Char; Escape: TTextWriterKind); override;
    /// write some #0 ended UTF-8 text, according to the specified format
    // - if Escape is a constant, consider calling directly AddNoJsonEscape,
    // AddJsonEscape or AddOnSameLine methods
    procedure Add(P: PUtf8Char; Len: PtrInt; Escape: TTextWriterKind); override;
    /// write some #0 ended Unicode text as UTF-8, according to the specified format
    // - if Escape is a constant, consider calling directly AddNoJsonEscapeW,
    // AddJsonEscapeW or AddOnSameLineW methods
    procedure AddW(P: PWord; Len: PtrInt; Escape: TTextWriterKind);
      {$ifdef HASINLINE}inline;{$endif}
    /// append some UTF-8 encoded chars to the buffer, from the main AnsiString type
    // - use the current system code page for AnsiString parameter
    procedure AddAnsiString(const s: AnsiString; Escape: TTextWriterKind); overload;
    /// append some UTF-8 encoded chars to the buffer, from any AnsiString value
    // - if CodePage is left to its default value of -1, it will assume
    // CurrentAnsiConvert.CodePage prior to Delphi 2009, but newer UNICODE
    // versions of Delphi will retrieve the code page from string
    // - if CodePage is defined to a >= 0 value, the encoding will take place
    procedure AddAnyAnsiString(const s: RawByteString; Escape: TTextWriterKind;
      CodePage: integer = -1);
    /// append some UTF-8 encoded chars to the buffer, from any Ansi buffer
    // - the codepage should be specified, e.g. CP_UTF8, CP_RAWBYTESTRING,
    // CP_WINANSI, or any version supported by the Operating System
    // - if codepage is 0, the current CurrentAnsiConvert.CodePage would be used
    // - will use TSynAnsiConvert to perform the conversion to UTF-8
    procedure AddAnyAnsiBuffer(P: PAnsiChar; Len: PtrInt;
      Escape: TTextWriterKind; CodePage: integer);
    /// write some data Base64 encoded
    // - if withMagic is TRUE, will write as '"\uFFF0base64encodedbinary"'
    procedure WrBase64(P: PAnsiChar; Len: PtrUInt; withMagic: boolean); override;
    /// write some binary-saved data with Base64 encoding
    // - if withMagic is TRUE, will write as '"\uFFF0base64encodedbinary"'
    // - is a wrapper around BinarySave() and WrBase64()
    procedure BinarySaveBase64(Data: pointer; Info: PRttiInfo;
      Kinds: TRttiKinds; withMagic: boolean; withCrc: boolean = false);
    /// append some values at once
    // - text values (e.g. RawUtf8) will be escaped as JSON by default
    procedure Add(const Values: array of const); overload;
    /// append some values at once with custom escaping
    procedure Add(const Values: array of const; Escape: TTextWriterKind); overload;
    /// append an array of RawUtf8 as CSV of JSON strings
    procedure AddCsvUtf8(const Values: array of RawUtf8);
    /// append an array of const as CSV of JSON values
    procedure AddCsvConst(const Values: array of const);
    /// append a quoted string as JSON, with in-place decoding
    // - if QuotedString does not start with ' or ", it will written directly
    // (i.e. expects to be a number, or null/true/false constants)
    // - as used e.g. by TJsonObjectDecoder.EncodeAsJson method and
    // JsonEncodeNameSQLValue() function
    procedure AddQuotedStringAsJson(const QuotedString: RawUtf8);

    /// append strings or integers with a specified format
    // - this overriden version will properly handle JSON escape
    // - % = #37 marks a string, integer, floating-point, or class parameter
    // to be appended as text (e.g. class name)
    // - note that due to a limitation of the "array of const" format, cardinal
    // values should be type-casted to Int64() - otherwise the integer mapped
    // value will be transmitted, therefore wrongly
    procedure Add(const Format: RawUtf8; const Values: array of const;
      Escape: TTextWriterKind = twNone;
      WriteObjectOptions: TTextWriterWriteObjectOptions = [woFullExpand]); override;
    /// append a variant content as number or string
    // - this overriden version will properly handle JSON escape
    // - properly handle Value as a TRttiVarData from TRttiProp.GetValue
    procedure AddVariant(const Value: variant; Escape: TTextWriterKind = twJsonEscape;
      WriteOptions: TTextWriterWriteObjectOptions = []); override;
    /// append complex types as JSON content using raw TypeInfo()
    // - handle rkClass as WriteObject, rkEnumeration/rkSet with proper options,
    // rkRecord, rkDynArray or rkVariant using proper JSON serialization
    // - other types will append 'null'
    procedure AddTypedJson(Value, TypeInfo: pointer;
      WriteOptions: TTextWriterWriteObjectOptions = []); override;
    /// serialize as JSON the given object
    procedure WriteObject(Value: TObject;
      WriteOptions: TTextWriterWriteObjectOptions = [woDontStoreDefault]); override;
    /// append complex types as JSON content using TRttiCustom
    // - called e.g. by TJsonWriter.AddVariant() for varAny / TRttiVarData
    procedure AddRttiCustomJson(Value: pointer; RttiCustom: TObject;
      Escape: TTextWriterKind; WriteOptions: TTextWriterWriteObjectOptions);
    /// append a JSON value, array or document, in a specified format
    // - this overriden version will properly handle JSON escape
    function AddJsonReformat(Json: PUtf8Char; Format: TTextWriterJsonFormat;
      EndOfObject: PUtf8Char): PUtf8Char; override;
    /// append a JSON value, array or document as simple XML content
    // - you can use JsonBufferToXML() and JsonToXML() functions as wrappers
    // - this method is called recursively to handle all kind of JSON values
    // - WARNING: the JSON buffer is decoded in-place, so will be changed
    // - returns the end of the current JSON converted level, or nil if the
    // supplied content was not correct JSON
    function AddJsonToXML(Json: PUtf8Char; ArrayName: PUtf8Char = nil;
      EndOfObject: PUtf8Char = nil): PUtf8Char;

    /// append a record content as UTF-8 encoded JSON or custom serialization
    // - default serialization will use Base64 encoded binary stream, or
    // a custom serialization, in case of a previous registration via
    // TRttiJson.RegisterCustomSerializer() class method - from a dynamic array
    // handling this kind of records, or directly from TypeInfo() of the record
    // - by default, custom serializers defined via RegisterCustomSerializer()
    // would write enumerates and sets as integer numbers, unless
    // twoEnumSetsAsTextInRecord or twoEnumSetsAsBooleanInRecord is set in
    // the instance CustomOptions
    // - returns the element size
    function AddRecordJson(Value: pointer; RecordInfo: PRttiInfo;
      WriteOptions: TTextWriterWriteObjectOptions = []): PtrInt;
    /// append a void record content as UTF-8 encoded JSON or custom serialization
    // - this method will first create a void record (i.e. filled with #0 bytes)
    // then save its content with default or custom serialization
    procedure AddVoidRecordJson(RecordInfo: PRttiInfo;
      WriteOptions: TTextWriterWriteObjectOptions = []);
    /// append a dynamic array content as UTF-8 encoded JSON array
    // - typical content could be
    // ! '[1,2,3,4]' or '["\uFFF0base64encodedbinary"]'
    procedure AddDynArrayJson(var DynArray: TDynArray;
      WriteOptions: TTextWriterWriteObjectOptions = []); overload;
    /// append a dynamic array content as UTF-8 encoded JSON array
    // - expect a dynamic array TDynArrayHashed wrapper as incoming parameter
    procedure AddDynArrayJson(var DynArray: TDynArrayHashed;
      WriteOptions: TTextWriterWriteObjectOptions = []); overload;
      {$ifdef HASINLINE}inline;{$endif}
    /// append a dynamic array content as UTF-8 encoded JSON array
    // - returns the array element size
    function AddDynArrayJson(Value: pointer; Info: TRttiCustom;
      WriteOptions: TTextWriterWriteObjectOptions = []): PtrInt; overload;
    /// append UTF-8 content as text
    // - Text CodePage will be used (if possible) - assume RawUtf8 otherwise
    // - will properly handle JSON escape between two " double quotes
    procedure AddText(const Text: RawByteString; Escape: TTextWriterKind = twJsonEscape);
    /// append UTF-16 content as text
    // - P should be a #0 terminated PWideChar buffer
    // - will properly handle JSON escape between two " double quotes
    procedure AddTextW(P: PWord; Escape: TTextWriterKind = twJsonEscape);
    /// append some UTF-8 encoded chars to the buffer
    // - escapes chars according to the JSON RFC
    // - if Len is 0, writing will stop at #0 (default Len = 0 is slightly faster
    // than specifying Len>0 if you are sure P is zero-ended - e.g. from RawUtf8)
    procedure AddJsonEscape(P: Pointer; Len: PtrInt = 0); overload;
    /// append some Unicode encoded chars to the buffer
    // - if Len is 0, Len is calculated from zero-ended widechar
    // - escapes chars according to the JSON RFC
    procedure AddJsonEscapeW(P: PWord; Len: PtrInt = 0);
    /// append some UTF-8 encoded chars to the buffer, from a RTL string type
    // - faster than AddJsonEscape(pointer(StringToUtf8(string))
    // - escapes chars according to the JSON RFC
    procedure AddJsonEscapeString(const s: string);
      {$ifdef HASINLINE}inline;{$endif}
    /// append some UTF-8 encoded chars to the buffer, from the main AnsiString type
    // - escapes chars according to the JSON RFC
    procedure AddJsonEscapeAnsiString(const s: AnsiString);
    /// append an open array constant value to the buffer
    // - "" will be added if necessary
    // - escapes chars according to the JSON RFC
    // - very fast (avoid most temporary storage)
    procedure AddJsonEscape(const V: TVarRec); overload;
    /// append a UTF-8 JSON string, JSON escaped between double quotes
    // - "" will always be added, before calling AddJsonEscape()
    procedure AddJsonString(const Text: RawUtf8);
    /// flush a supplied TJsonWriter, and write pending data as JSON escaped text
    // - may be used with InternalJsonWriter, as a faster alternative to
    // ! AddJsonEscape(Pointer(fInternalJsonWriter.Text),0);
    procedure AddJsonEscape(Source: TJsonWriter); overload;
    /// flush a supplied TJsonWriter, and write pending data as JSON escaped text
    // - may be used with InternalJsonWriter, as a faster alternative to
    // ! AddNoJsonEscapeUtf8(Source.Text);
    procedure AddNoJsonEscape(Source: TJsonWriter); overload;
    /// append a UTF-8 already encoded JSON buffer forcing Unicode escape
    // - don't escapes chars according to the JSON RFC but convert any 8-bit
    // UTF-8 values as their UTF-16 \u#### escaped content
    // - i.e. generate a pure ASCII output with no UTF-8 encoding involved
    // - used for jsonEscapeUnicode to follow python default json.dumps() layout
    procedure AddNoJsonEscapeForcedUnicode(P: PUtf8Char; Len: PtrInt);
    /// append a UTF-8 encoded JSON buffer without any \u#### Unicode escape
    // - i.e. \u#### patterns will be converted into pure UTF-8 output
    // - as used for jsonNoEscapeUnicode transformation
    procedure AddNoJsonEscapeForcedNoUnicode(P: PUtf8Char; Len: PtrInt);
    /// append an open array constant value to the buffer
    // - "" won't be added for string values
    // - string values may be escaped, depending on the supplied parameter
    // - very fast (avoid most temporary storage)
    procedure Add(const V: TVarRec; Escape: TTextWriterKind = twNone;
      WriteObjectOptions: TTextWriterWriteObjectOptions = [woFullExpand]); overload;
    /// encode the supplied data as an UTF-8 valid JSON object content
    // - data must be supplied two by two, as Name,Value pairs, e.g.
    // ! aWriter.AddJsonEscape(['name','John','year',1972]);
    // will append to the buffer:
    // ! '{"name":"John","year":1972}'
    // - or you can specify nested arrays or objects with '['..']' or '{'..'}':
    // ! aWriter.AddJsonEscape(['doc','{','name','John','ab','[','a','b']','}','id',123]);
    // will append to the buffer:
    // ! '{"doc":{"name":"John","abc":["a","b"]},"id":123}'
    // - note that, due to a Delphi compiler limitation, cardinal values should be
    // type-casted to Int64() (otherwise the integer mapped value will be converted)
    // - you can pass nil as parameter for a null JSON value
    procedure AddJsonEscape(
      const NameValuePairs: array of const); overload;
    /// encode the supplied (extended) JSON content, with parameters,
    // as an UTF-8 valid JSON object content
    // - in addition to the JSON RFC specification strict mode, this method will
    // handle some BSON-like extensions, e.g. unquoted field names:
    // ! aWriter.AddJson('{id:?,%:{name:?,birthyear:?}}',['doc'],[10,'John',1982]);
    // - you can use nested _Obj() / _Arr() instances
    // ! aWriter.AddJson('{%:{$in:[?,?]}}',['type'],['food','snack']);
    // ! aWriter.AddJson('{type:{$in:?}}',[],[_Arr(['food','snack'])]);
    // ! // which are the same as:
    // ! aWriter.AddShort('{"type":{"$in":["food","snack"]}}');
    // - if the mormot.db.nosql.bson unit is used in the application, the MongoDB
    // Shell syntax will also be recognized to create TBsonVariant, like
    // ! new Date()   ObjectId()   MinKey   MaxKey  /<jRegex>/<jOptions>
    // see @http://docs.mongodb.org/manual/reference/mongodb-extended-json
    // !  aWriter.AddJson('{name:?,field:/%/i}',['acme.*corp'],['John']))
    // ! // will write
    // ! '{"name":"John","field":{"$regex":"acme.*corp","$options":"i"}}'
    // - will call internally _JsonFastFmt() to create a temporary TDocVariant
    // with all its features - so is slightly slower than other AddJson* methods
    procedure AddJson(const Format: RawUtf8;
      const Args, Params: array of const);
    /// append two JSON arrays of keys and values as one JSON object
    // - i.e. makes the following transformation:
    // $ [key1,key2...] + [value1,value2...] -> {key1:value1,key2,value2...}
    // - this method won't allocate any memory during its process, nor
    // modify the keys and values input buffers
    // - is the reverse of the JsonObjectAsJsonArrays() function
    // - used e.g. by TSynDictionary.SaveToJson
    procedure AddJsonArraysAsJsonObject(keys, values: PUtf8Char);
  end;


{ ************ JSON-aware TSynNameValue TSynPersistentStoreJson }

type
  /// store one Name/Value pair, as used by TSynNameValue class
  TSynNameValueItem = record
    /// the name of the Name/Value pair
    // - this property is hashed by TSynNameValue for fast retrieval
    Name: RawUtf8;
    /// the value of the Name/Value pair
    Value: RawUtf8;
    /// any associated Pointer or numerical value
    Tag: PtrInt;
  end;

  /// Name/Value pairs storage, as used by TSynNameValue class
  TSynNameValueItemDynArray = array of TSynNameValueItem;

  /// event handler used to convert on the fly some UTF-8 text content
  TOnSynNameValueConvertRawUtf8 = function(
    const text: RawUtf8): RawUtf8 of object;

  /// callback event used by TSynNameValue
  TOnSynNameValueNotify = procedure(
    const Item: TSynNameValueItem; Index: PtrInt) of object;

  /// pseudo-class used to store Name/Value RawUtf8 pairs
  // - use internally a TDynArrayHashed instance for fast retrieval
  // - is therefore faster than TRawUtf8List
  // - is defined as an object, not as a class: you can use this in any
  // class, without the need to destroy the content
  // - Delphi "object" is buggy on stack -> also defined as record with methods
  {$ifdef USERECORDWITHMETHODS}
  TSynNameValue = record
  private
  {$else}
  TSynNameValue = object
  protected
  {$endif USERECORDWITHMETHODS}
    fOnAdd: TOnSynNameValueNotify;
    function GetBlobData: RawByteString;
    procedure SetBlobData(const aValue: RawByteString);
    function GetStr(const aName: RawUtf8): RawUtf8;
      {$ifdef HASINLINE}inline;{$endif}
    function GetInt(const aName: RawUtf8): Int64;
      {$ifdef HASINLINE}inline;{$endif}
  public
    /// the internal Name/Value storage
    List: TSynNameValueItemDynArray;
    /// the number of Name/Value pairs
    Count: integer;
    /// low-level access to the internal storage hasher
    DynArray: TDynArrayHashed;
    /// initialize the storage
    // - will also reset the internal List[] and the internal hash array
    procedure Init(aCaseSensitive: boolean);
    /// add an element to the array
    // - if aName already exists, its associated Value will be updated
    procedure Add(const aName, aValue: RawUtf8; aTag: PtrInt = 0);
    /// reset content, then add all name=value pairs from a supplied .ini file
    // section content
    // - will first call Init(false) to initialize the internal array
    // - Section can be retrieved e.g. via FindSectionFirstLine()
    procedure InitFromIniSection(Section: PUtf8Char;
      const OnTheFlyConvert: TOnSynNameValueConvertRawUtf8 = nil;
      const OnAdd: TOnSynNameValueNotify = nil);
    /// reset content, then add all name=value; CSV pairs
    // - will first call Init(false) to initialize the internal array
    // - if ItemSep=#10, then any kind of line feed (CRLF or LF) will be handled
    procedure InitFromCsv(Csv: PUtf8Char; NameValueSep: AnsiChar = '=';
      ItemSep: AnsiChar = #10);
    /// reset content, then add all fields from an JSON object
    // - will first call Init() to initialize the internal array
    // - then parse the incoming JSON object, storing all its field values
    // as RawUtf8, and returning TRUE if the supplied content is correct
    // - warning: the supplied JSON buffer will be decoded and modified in-place
    function InitFromJson(Json: PUtf8Char; aCaseSensitive: boolean = false): boolean;
    /// reset content, then add all name, value pairs
    // - will first call Init(false) to initialize the internal array
    procedure InitFromNamesValues(const Names, Values: array of RawUtf8);
    /// search for a Name, return the index in List
    // - using fast O(1) hash algoritm
    function Find(const aName: RawUtf8): PtrInt;
    /// search for the first chars of a Name, return the index in List
    // - using O(n) calls of IdemPChar() function
    // - here aUpperName should be already uppercase, as expected by IdemPChar()
    function FindStart(const aUpperName: RawUtf8): PtrInt;
    /// search for a Value, return the index in List
    // - using O(n) brute force algoritm with case-sensitive aValue search
    function FindByValue(const aValue: RawUtf8): PtrInt;
    /// search for a Name, and delete its entry in the List if it exists
    function Delete(const aName: RawUtf8): boolean;
    /// search for a Value, and delete its entry in the List if it exists
    // - returns the number of deleted entries
    // - you may search for more than one match, by setting a >1 Limit value
    function DeleteByValue(const aValue: RawUtf8; Limit: integer = 1): integer;
    /// search for a Name, return the associated Value as a UTF-8 string
    function Value(const aName: RawUtf8; const aDefaultValue: RawUtf8 = ''): RawUtf8;
    /// search for a Name, return the associated Value as integer
    function ValueInt(const aName: RawUtf8; const aDefaultValue: Int64 = 0): Int64;
    /// search for a Name, return the associated Value as boolean
    // - returns true only if the value is exactly '1' / 'true'
    function ValueBool(const aName: RawUtf8): boolean;
      {$ifdef HASINLINE}inline;{$endif}
    /// search for a Name, return the associated Value as an enumerate
    // - returns true and set aEnum if aName was found, and associated value
    // matched an aEnumTypeInfo item
    // - returns false if no match was found
    function ValueEnum(const aName: RawUtf8; aEnumTypeInfo: PRttiInfo;
      out aEnum; aEnumDefault: PtrUInt = 0): boolean; overload;
    /// returns all values, as CSV or INI content
    function AsCsv(const KeySeparator: RawUtf8 = '=';
      const ValueSeparator: RawUtf8 = #13#10; const IgnoreKey: RawUtf8 = ''): RawUtf8;
    /// returns all values as a JSON object of string fields
    function AsJson: RawUtf8;
    /// fill the supplied two arrays of RawUtf8 with the stored values
    procedure AsNameValues(out Names, Values: TRawUtf8DynArray);
    /// search for a Name, return the associated Value as variant
    // - returns null if the name was not found
    function ValueVariantOrNull(const aName: RawUtf8): variant;
    /// compute a TDocVariant document from the stored values
    // - output variant will be reset and filled as a TDocVariant instance,
    // ready to be serialized as a JSON object
    // - if there is no value stored (i.e. Count=0), set null
    procedure AsDocVariant(out DocVariant: variant;
      ExtendedJson: boolean = false; ValueAsString: boolean = true;
      AllowVarDouble: boolean = false); overload;
    /// compute a TDocVariant document from the stored values
    function AsDocVariant(ExtendedJson: boolean = false;
      ValueAsString: boolean = true): variant; overload;
      {$ifdef HASINLINE}inline;{$endif}
    /// merge the stored values into a TDocVariant document
    // - existing properties would be updated, then new values will be added to
    // the supplied TDocVariant instance, ready to be serialized as a JSON object
    // - if ValueAsString is TRUE, values would be stored as string
    // - if ValueAsString is FALSE, numerical values would be identified by
    // IsString() and stored as such in the resulting TDocVariant
    // - if you let ChangedProps point to a TDocVariantData, it would contain
    // an object with the stored values, just like AsDocVariant
    // - returns the number of updated values in the TDocVariant, 0 if
    // no value was changed
    function MergeDocVariant(var DocVariant: variant; ValueAsString: boolean;
      ChangedProps: PVariant = nil; ExtendedJson: boolean = false;
      AllowVarDouble: boolean = false): integer;
    /// returns true if the Init() method has been called
    function Initialized: boolean;
    /// can be used to set all data from one BLOB memory buffer
    procedure SetBlobDataPtr(aValue, aValueMax: pointer);
    /// can be used to set or retrieve all stored data as one BLOB content
    property BlobData: RawByteString
      read GetBlobData write SetBlobData;
    /// event triggerred after an item has just been added to the list
    property OnAfterAdd: TOnSynNameValueNotify
      read fOnAdd write fOnAdd;
    /// search for a Name, return the associated Value as a UTF-8 string
    // - returns '' if aName is not found in the stored keys
    property Str[const aName: RawUtf8]: RawUtf8
      read GetStr; default;
    /// search for a Name, return the associated Value as integer
    // - returns 0 if aName is not found, or not a valid Int64 in the stored keys
    property Int[const aName: RawUtf8]: Int64
      read GetInt;
    /// search for a Name, return the associated Value as boolean
    // - returns true if aName stores '1' / 'true' as associated value
    property Bool[const aName: RawUtf8]: boolean
      read ValueBool;
  end;


  /// a reference pointer to a Name/Value RawUtf8 pairs storage
  PSynNameValue = ^TSynNameValue;

  /// implement a cache of some key/value pairs, e.g. to improve reading speed
  // - used e.g. by TSqlDataBase for caching the SELECT statements results in an
  // internal JSON format (which is faster than a query to the SQLite3 engine)
  // - internally make use of an efficient hashing algorithm for fast response
  // (i.e. TSynNameValue will use the TDynArrayHashed wrapper mechanism)
  TSynCache = class(TSynPersistent)
  protected
    fNameValue: TSynNameValue;
    fRamUsed: cardinal;
    fMaxRamUsed: cardinal;
    fTimeoutSeconds: cardinal;
    fTimeoutTix: cardinal;
    fSafe: TRWLock; // writes should be reentrant for Reset
    procedure ResetIfNeeded; // call Reset after TimeoutSeconds
  public
    /// initialize the internal storage
    // - aMaxCacheRamUsed can set the maximum RAM to be used for values, in bytes
    // (default is 16 MB), after which the cache is flushed
    // - by default, key search is done case-insensitively, but you can specify
    // another option here
    // - by default, there is no timeout period, but you may specify a number of
    // seconds of inactivity (i.e. no Add call) after which the cache is flushed
    constructor Create(aMaxCacheRamUsed: cardinal = 16 shl 20;
      aCaseSensitive: boolean = false; aTimeoutSeconds: cardinal = 0); reintroduce;
    /// find a Key in the cache entries
    // - return '' if nothing found: you may call Add() just after to insert
    // the expected value in the cache
    // - return the associated Value otherwise, and the associated integer tag
    // if aResultTag address is supplied
    // - this method is thread-safe, using the Safe R/W locker of this instance
    function Find(const aKey: RawUtf8; aResultTag: PPtrInt = nil): RawUtf8;
    /// add a Key/Value pair in the cache entries
    // - returns true if aKey was not existing yet, and aValue has been stored
    // - returns false if aKey did already exist in the internal cache, and
    // its entry has been updated with the supplied aValue/aTag
    // - this method is thread-safe, using the Safe R/W locker of this instance
    function AddOrUpdate(const aKey, aValue: RawUtf8; aTag: PtrInt): boolean;
    /// called after a write access to the database to flush the cache
    // - set Count to 0
    // - release all cache memory
    // - returns TRUE if was flushed, i.e. if there was something in cache
    // - this method is thread-safe, using the Safe R/W locker of this instance
    function Reset: boolean;
    /// access to the internal R/W locker, for thread-safe process
    // - Find/AddOrUpdate methods are protected by this R/W lock
    property Safe: TRWLock
      read fSafe;
  published
    /// number of entries in the cache
    property Count: integer
      read fNameValue.Count;
    /// the current global size of Values in RAM cache, in bytes
    property RamUsed: cardinal
      read fRamUsed;
    /// the maximum RAM to be used for values, in bytes
    // - the cache is flushed when ValueSize reaches this limit
    // - default is 16 MB (16 shl 20)
    property MaxRamUsed: cardinal
      read fMaxRamUsed;
    /// after how many seconds betwen Add() calls the cache should be flushed
    // - equals 0 by default, meaning no time out
    property TimeoutSeconds: cardinal
      read fTimeoutSeconds;
  end;


type
  /// implement binary persistence and JSON serialization (not deserialization)
  TSynPersistentStoreJson = class(TSynPersistentStore)
  protected
    // append "name" -> inherited should add properties to the JSON object
    procedure AddJson(W: TJsonWriter); virtual;
  public
    /// serialize this instance as a JSON object
    function SaveToJson(reformat: TTextWriterJsonFormat = jsonCompact): RawUtf8;
  end;



{ *********** JSON-aware TSynDictionary Storage }

type
  /// exception raised during TSynDictionary process
  ESynDictionary = class(ESynException);

  // internal flag, used only by TSynDictionary.InArray protected method
  TSynDictionaryInArray = (
    iaFind,
    iaFindAndDelete,
    iaFindAndUpdate,
    iaFindAndAddIfNotExisting,
    iaAdd,
    iaAddForced);

  /// event called by TSynDictionary.ForEach methods to iterate over stored items
  // - if the implementation method returns TRUE, will continue the loop
  // - if the implementation method returns FALSE, will stop values browsing
  // - aOpaque is a custom value specified at ForEach() method call
  TOnSynDictionary = function(const aKey; var aValue;
    aIndex, aCount: integer; aOpaque: pointer): boolean of object;

  /// event called by TSynDictionary.DeleteDeprecated
  // - called just before deletion: return false to by-pass this item
  TOnSynDictionaryCanDelete = function(const aKey, aValue;
    aIndex: integer): boolean of object;

  /// thread-safe dictionary to store some values from associated keys
  // - will maintain a dynamic array of values, associated with a hash table
  // for the keys, so that setting or retrieving values would be O(1)
  // - thread-safe by default, since most methods are protected by a TSynLocker;
  // use the ThreadUse option to tune thread-safety (e.g. disable or use a TRWLock)
  // - TDynArray is a wrapper which does not store anything, whereas this class
  // actually stores both keys and values, and provide convenient methods to
  // access the stored data, including JSON serialization and binary storage
  // - consider IKeyValue<> from mormot.core.collections.pas, for more robust
  // generics-based code where TKey/TValue are propagated to all methods
  TSynDictionary = class(TSynLocked)
  protected
    fKeys: TDynArrayHashed;
    fValues: TDynArray;
    fTimeOut: TCardinalDynArray;
    fTimeOuts: TDynArray;
    fCompressAlgo: TAlgoCompress;
    fOnCanDelete: TOnSynDictionaryCanDelete;
    function InternalAddUpdate(aKey, aValue: pointer; aUpdate: boolean): PtrInt;
    function InArray(const aKey, aArrayValue; aAction: TSynDictionaryInArray;
      aCompare: TDynArraySortCompare): boolean;
    procedure SetTimeouts;
    function ComputeNextTimeOut: cardinal;
      {$ifdef HASINLINE} inline; {$endif}
    function GetCapacity: integer;
    procedure SetCapacity(const Value: integer);
    function GetTimeOutSeconds: cardinal;
      {$ifdef HASINLINE} inline; {$endif}
    procedure SetTimeOutSeconds(Value: cardinal);
    function GetThreadUse: TSynLockerUse;
      {$ifdef HASINLINE} inline; {$endif}
    procedure SetThreadUse(const Value: TSynLockerUse);
      {$ifdef HASINLINE} inline; {$endif}
  public
    /// initialize the dictionary storage, specifying dynamic array keys/values
    // - aKeyTypeInfo should be a dynamic array TypeInfo() RTTI pointer, which
    // would store the keys within this TSynDictionary instance
    // - aValueTypeInfo should be a dynamic array TypeInfo() RTTI pointer, which
    // would store the values within this TSynDictionary instance
    // - by default, string keys would be searched following exact case, unless
    // aKeyCaseInsensitive is TRUE
    // - you can set an optional timeout period, in seconds - you should call
    // DeleteDeprecated periodically to search for deprecated items
    constructor Create(aKeyTypeInfo, aValueTypeInfo: PRttiInfo;
      aKeyCaseInsensitive: boolean = false; aTimeoutSeconds: cardinal = 0;
      aCompressAlgo: TAlgoCompress = nil; aHasher: THasher = nil); reintroduce; virtual;
    {$ifdef HASGENERICS}
    /// initialize the dictionary storage, specifying keys/values as generic types
    // - just a convenient wrapper around TSynDictionary.Create()
    // - consider IKeyValue<> from mormot.core.collections.pas, for more robust
    // generics-based code where TKey/TValue are propagated to all methods
    class function New<TKey, TValue>(aKeyCaseInsensitive: boolean = false;
      aTimeoutSeconds: cardinal = 0; aCompressAlgo: TAlgoCompress = nil;
      aHasher: THasher = nil): TSynDictionary;
        static; {$ifdef FPC} inline; {$endif}
    {$endif HASGENERICS}
    /// finalize the storage
    // - would release all internal stored values
    destructor Destroy; override;
    /// try to add a value associated with a primary key
    // - returns the index of the inserted item, -1 if aKey is already existing
    // - this method is thread-safe, since it will lock the instance
    function Add(const aKey, aValue): PtrInt;
    /// store a value associated with a primary key
    // - returns the index of the matching item
    // - if aKey does not exist, a new entry is added
    // - if aKey does exist, the existing entry is overriden with aValue
    // - this method is thread-safe, since it will lock the instance
    function AddOrUpdate(const aKey, aValue): PtrInt;
    /// clear the value associated via aKey
    // - does not delete the entry, but reset its value
    // - returns the index of the matching item, -1 if aKey was not found
    // - this method is thread-safe, since it will lock the instance
    function Clear(const aKey): PtrInt;
    /// delete all key/value stored in the current instance
    procedure DeleteAll;
    /// delete a key/value association from its supplied aKey
    // - this would delete the entry, i.e. matching key and value pair
    // - returns the index of the deleted item, -1 if aKey was not found
    // - this method is thread-safe, since it will lock the instance
    function Delete(const aKey): PtrInt;
    /// delete a key/value association from its internal index
    // - this method is not thread-safe: you should use fSafe.Lock/Unlock
    // e.g. then Find/FindValue to retrieve the index value
    function DeleteAt(aIndex: PtrInt): boolean;
    /// search and delete all deprecated items according to TimeoutSeconds
    // - returns how many items have been deleted
    // - you can call this method very often: it will ensure that the
    // search process will take place at most once every second
    // - this method is thread-safe, but blocking during the process
    function DeleteDeprecated(tix64: Int64 = 0): integer;
    /// search of a primary key within the internal hashed dictionary
    // - returns the index of the matching item, -1 if aKey was not found
    // - if you want to access the value, you should use fSafe.Lock/Unlock:
    // consider using Exists or FindAndCopy thread-safe methods instead
    // - aUpdateTimeOut will update the associated timeout value of the entry
    function Find(const aKey; aUpdateTimeOut: boolean = false): PtrInt;
    /// search of a primary key within the internal hashed dictionary
    // - returns a pointer to the matching item, nil if aKey was not found
    // - if you want to access the value, you should use fSafe.Lock/Unlock:
    // consider using Exists or FindAndCopy thread-safe methods instead
    // - aUpdateTimeOut will update the associated timeout value of the entry
    function FindValue(const aKey; aUpdateTimeOut: boolean = false;
      aIndex: PPtrInt = nil): pointer;
    /// search of a primary key within the internal hashed dictionary
    // - returns a pointer to the matching or already existing value item
    // - if you want to access the value, you should use fSafe.Lock/Unlock:
    // consider using Exists or FindAndCopy thread-safe methods instead
    // - will update the associated timeout value of the entry, if applying
    function FindValueOrAdd(const aKey; var added: boolean;
      aIndex: PPtrInt = nil): pointer;
    /// search of a stored value by its primary key, and return a local copy
    // - so this method is thread-safe
    // - returns TRUE if aKey was found, FALSE if no match exists
    // - will update the associated timeout value of the entry, unless
    // aUpdateTimeOut is set to false
    function FindAndCopy(const aKey;
      var aValue; aUpdateTimeOut: boolean = true): boolean;
    /// search of a stored value by its primary key, then delete and return it
    // - returns TRUE if aKey was found, fill aValue with its content,
    // and delete the entry in the internal storage
    // - so this method is thread-safe
    // - returns FALSE if no match exists
    function FindAndExtract(const aKey; var aValue): boolean;
    /// search of a stored value, and return seconds since its timeout was set
    // - returns -1 if aKey was not found
    // - this method is thread-safe
    function FindAndGetElapsedSeconds(const aKey): integer;
    /// search of a stored value, and delete it if its timeout was set too long ago
    // - returns true if aKey was found and deleted
    // - returns false if aKey was not found or the entry not deprecated
    // - this method is thread-safe
    function FindAndDeleteDeprecated(const aKey; aSeconds: integer): boolean;
    /// search for a primary key presence
    // - returns TRUE if aKey was found, FALSE if no match exists
    // - this method is thread-safe
    function Exists(const aKey): boolean;
    /// search for a value presence
    // - returns TRUE if aValue was found, FALSE if no match exists
    // - this method is thread-safe, but will use O(n) slow browsing
    function ExistsValue(const aValue; aCompare: TDynArraySortCompare = nil): boolean;
    /// apply a specified event over all items stored in this dictionnary
    // - would browse the list in the adding order
    // - returns the number of times OnEach has been called
    // - this method is thread-safe - if the callback modifies the data, set
    // MayModify=true and call fSafe.Lock/UnLock when writing
    function ForEach(const OnEach: TOnSynDictionary;
      Opaque: pointer = nil; MayModify: boolean = true): integer; overload;
    /// apply a specified event over matching items stored in this dictionnary
    // - would browse the list in the adding order, comparing each key and/or
    // value item with the supplied comparison functions and aKey/aValue content
    // - returns the number of times OnMatch has been called, i.e. how many times
    // KeyCompare(aKey,Keys[#])=0 or ValueCompare(aValue,Values[#])=0
    // - this method is thread-safe - if the callback modifies the data, set
    // MayModify=true and call fSafe.Lock/UnLock when writing
    function ForEach(const OnMatch: TOnSynDictionary;
      KeyCompare, ValueCompare: TDynArraySortCompare; const aKey, aValue;
      Opaque: pointer = nil; MayModify: boolean = true): integer; overload;
    /// touch the entry timeout field so that it won't be deprecated sooner
    // - this method is not thread-safe, and is expected to be executed e.g.
    // from a ForEach() TOnSynDictionary callback
    procedure SetTimeoutAtIndex(aIndex: PtrInt);
    /// search aArrayValue item in a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, then use TDynArray.Find
    // to delete any aArrayValue match in the associated dynamic array
    // - returns FALSE if Values is not a tkDynArray, or if aKey or aArrayValue
    // were not found
    // - this method is thread-safe, since it will lock the instance
    function FindInArray(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// search of a stored key by its associated key, and return a key local copy
    // - won't use any hashed index but RTTI TDynArray.IndexOf search over
    // over fValues() so is much slower than FindAndCopy() for huge arrays
    // - will update the associated timeout value of the entry, unless
    // aUpdateTimeOut is set to false
    // - this method is thread-safe
    // - returns TRUE if aValue was found, FALSE if no match exists
    function FindKeyFromValue(const aValue; out aKey;
      aUpdateTimeOut: boolean = true): boolean;
    /// add aArrayValue item within a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, then use TDynArray.Add
    // to add aArrayValue to the associated dynamic array
    // - returns FALSE if Values is not a tkDynArray, or if aKey was not found
    // - this method is thread-safe, since it will lock the instance
    function AddInArray(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// add aArrayValue item within a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, create the entry if not found,
    //  then use TDynArray.Add to add aArrayValue to the associated dynamic array
    // - returns FALSE if Values is not a tkDynArray
    // - this method is thread-safe, since it will lock the instance
    function AddInArrayForced(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// add once aArrayValue within a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, then use
    // TDynArray.FindAndAddIfNotExisting to add once aArrayValue to the
    // associated dynamic array
    // - returns FALSE if Values is not a tkDynArray, or if aKey was not found
    // - this method is thread-safe, since it will lock the instance
    function AddOnceInArray(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// clear aArrayValue item of a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, then use TDynArray.FindAndDelete
    // to delete any aArrayValue match in the associated dynamic array
    // - returns FALSE if Values is not a tkDynArray, or if aKey or aArrayValue
    // were not found
    // - this method is thread-safe, since it will lock the instance
    function DeleteInArray(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// replace aArrayValue item of a dynamic-array value associated via aKey
    // - expect the stored value to be a dynamic array itself
    // - would search for aKey as primary key, then use TDynArray.FindAndUpdate
    // to delete any aArrayValue match in the associated dynamic array
    // - returns FALSE if Values is not a tkDynArray, or if aKey or aArrayValue were
    // not found
    // - this method is thread-safe, since it will lock the instance
    function UpdateInArray(const aKey, aArrayValue;
      aCompare: TDynArraySortCompare = nil): boolean;
    /// make a copy of the stored values
    // - this method is thread-safe, since it will lock the instance during copy
    // - resulting length(Dest) will match the exact values count
    // - T*ObjArray will be reallocated and copied by content (using a temporary
    // JSON serialization), unless ObjArrayByRef is true and pointers are copied
    procedure CopyValues(out Dest; ObjArrayByRef: boolean = false);
    /// serialize the content as a "key":value JSON object
    procedure SaveToJson(W: TJsonWriter; EnumSetsAsText: boolean = false); overload;
    /// serialize the content as a "key":value JSON object
    function SaveToJson(EnumSetsAsText: boolean = false): RawUtf8; overload;
    /// serialize the Values[] as a JSON array
    function SaveValuesToJson(EnumSetsAsText: boolean = false;
      ReFormat: TTextWriterJsonFormat = jsonCompact): RawUtf8;
    /// unserialize the content from "key":value JSON object
    // - if the JSON input may not be correct (i.e. if not coming from SaveToJson),
    // you may set EnsureNoKeyCollision=TRUE for a slow but safe keys validation
    function LoadFromJson(const Json: RawUtf8;
      CustomVariantOptions: PDocVariantOptions = nil): boolean; overload;
    /// unserialize the content from "key":value JSON object
    // - note that input JSON buffer is not modified in place: no need to create
    // a temporary copy if the buffer is about to be re-used
    function LoadFromJson(Json: PUtf8Char;
      CustomVariantOptions: PDocVariantOptions = nil): boolean; overload;
    /// save the content as SynLZ-compressed raw binary data
    // - warning: this format is tied to the values low-level RTTI, so if you
    // change the value/key type definitions, LoadFromBinary() would fail
    function SaveToBinary(NoCompression: boolean = false;
      Algo: TAlgoCompress = nil): RawByteString;
    /// load the content from SynLZ-compressed raw binary data
    // - as previously saved by SaveToBinary method
    function LoadFromBinary(const binary: RawByteString): boolean;
    /// can be assigned to OnCanDeleteDeprecated to check
    // TSynPersistentLock(aValue).Safe.IsLocked before actual deletion
    class function OnCanDeleteSynPersistentLock(
      const aKey, aValue; aIndex: PtrInt): boolean;
    {$ifndef PUREMORMOT2}
    class function OnCanDeleteSynPersistentLocked(
      const aKey, aValue; aIndex: PtrInt): boolean;
    {$endif PUREMORMOT2}
    /// returns how many items are currently stored in this dictionary
    // - this method is NOT thread-safe so should be protected by fSafe.Lock/UnLock
    function Count: integer;
      {$ifdef HASINLINE}inline;{$endif}
    /// direct access to the primary key identifiers
    // - if you want to access the keys, you should use fSafe.Lock/Unlock
    property Keys: TDynArrayHashed
      read fKeys;
    /// direct access to the associated stored values
    // - if you want to access the values, you should use fSafe.Lock/Unlock
    property Values: TDynArray
      read fValues;
    /// defines how many items are currently stored in Keys/Values internal arrays
    // - if you set a maximum size of this store (even a rough size), Add() are
    // likely to be up to twice faster than letting the table grow by chunks
    property Capacity: integer
      read GetCapacity write SetCapacity;
    /// direct low-level access to the internal access tick (GetTickCount64 shr 10)
    // - may be nil if TimeOutSeconds=0
    property TimeOut: TCardinalDynArray
      read fTimeOut;
    /// returns the aTimeOutSeconds parameter value, as specified to Create()
    // - warning: setting a new timeout will clear all previous content
    property TimeOutSeconds: cardinal
      read GetTimeOutSeconds write SetTimeOutSeconds;
    /// the compression algorithm used for binary serialization
    property CompressAlgo: TAlgoCompress
      read fCompressAlgo write fCompressAlgo;
    /// callback to by-pass DeleteDeprecated deletion by returning false
    // - can be assigned e.g. to OnCanDeleteSynPersistentLock if Value is a
    // TSynPersistentLock instance, to avoid any potential access violation
    property OnCanDeleteDeprecated: TOnSynDictionaryCanDelete
      read fOnCanDelete write fOnCanDelete;
    /// can tune TSynDictionary threading process depending on your use case
    // - will redirect to the internal Safe TSynLocker instance
    // - warning: to be set only before any process is done
    // - advice: any performance impact should always be monitored, not guessed
    property ThreadUse: TSynLockerUse
      read GetThreadUse write SetThreadUse;
  end;

const
  // TSynDictionary.fSafe.Padding[DIC_*] place holders - defined here for inlining
  DIC_KEYCOUNT   = 0;   // Keys.Count integer
  DIC_KEY        = 1;   // Key.Value pointer
  DIC_VALUECOUNT = 2;   // Values.Count integer
  DIC_VALUE      = 3;   // Values.Value pointer
  DIC_TIMECOUNT  = 4;   // Timeouts.Count integer
  DIC_TIMESEC    = 5;   // Timeouts Seconds integer
  DIC_TIMETIX    = 6;   // last GetTickCount64 shr 10 integer


{ ********** Low-level JSON Serialization for any kind of Values }

type
  /// internal stack-allocated structure for nested JSON serialization
  // - defined here for low-level use within TRttiJsonSave functions
  {$ifdef USERECORDWITHMETHODS}
  TJsonSaveContext = record
  {$else}
  TJsonSaveContext = object
  {$endif USERECORDWITHMETHODS}
  public
    /// the associated stream writer for the JSON output
    W: TJsonWriter;
    /// serialization options as specified for this process
    // - as used by AddShort/Add64/AddDateTime methods
    Options: TTextWriterWriteObjectOptions;
    /// the RTTI information of the current serialized type
    Info: TRttiCustom;
    /// the RTTI information of the current serialized property
    // - is likely to be nil outside of properties serialization
    Prop: PRttiCustomProp;
    /// initialize this low-level JSON serialization context
    procedure Init(WR: TJsonWriter;
      WriteOptions: TTextWriterWriteObjectOptions; Rtti: TRttiCustom);
      {$ifdef HASINLINE}inline;{$endif}
    /// some basic function to append a shorstring JSON value according to Options
    procedure AddShort(PS: PShortString);
    /// some basic function to append an Int64 JSON value according to Options
    procedure Add64(Value: PInt64; UnSigned: boolean);
      {$ifdef HASINLINE}inline;{$endif}
    /// some basic function to append a TDateTime JSON value according to Options
    procedure AddDateTime(Value: PDateTime; WithMS: boolean);
    /// some basic function to append a "name":boolean JSON pair value
    procedure AddShortBoolean(PS: PShortString; Value: boolean);
  end;

  /// internal function handler for JSON persistence of any TRttiParserType value
  // - i.e. the kind of functions called via PT_JSONSAVE[] lookup table
  TRttiJsonSave = procedure(Data: pointer; const Ctxt: TJsonSaveContext);


{ ********** Low-level JSON Unserialization for any kind of Values }

type
  /// store one name/value pair of raw UTF-8 content, from a JSON buffer
  // - used e.g. by JsonDecode() overloaded function or UrlEncodeJsonObject()
  // to returns names/values
  TNameValuePUtf8Char = record
    /// pointer and length to the actual UTF-8 name text
    Name: TValuePUtf8Char;
    /// pointer and length to the actual UTF-8 value text
    Value: TValuePUtf8Char;
  end;

  /// used e.g. by JsonDecode() overloaded function to returns name/value pairs
  TNameValuePUtf8CharDynArray = array of TNameValuePUtf8Char;

/// decode the supplied UTF-8 JSON content for the supplied names
// - data will be set in Values, according to the Names supplied e.g.
// ! JsonDecode(JSON,['name','year'],@Values) -> Values[0].Value='John'; Values[1].Value='1972';
// - if any supplied name wasn't found its corresponding Values[] will be nil
// - this procedure will decode the JSON content in-memory, i.e. the PUtf8Char
// array is created inside JSON, which is therefore modified: make a private
// copy first if you want to reuse the JSON content
// - if HandleValuesAsObjectOrArray is TRUE, then this procedure will handle
// JSON arrays or objects
// - support enhanced JSON syntax, e.g. '{name:'"John",year:1972}' is decoded
// just like '{"name":'"John","year":1972}'
procedure JsonDecode(var Json: RawUtf8; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray;
  HandleValuesAsObjectOrArray: boolean = false); overload;

/// decode the supplied UTF-8 JSON content for the supplied names
// - an overloaded function when the JSON is supplied as a RawJson variable
procedure JsonDecode(var Json: RawJson; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray;
  HandleValuesAsObjectOrArray: boolean = false); overload;

/// decode the supplied UTF-8 JSON object for the supplied field names
// - data will be set in Values, according to the Names supplied e.g.
// ! JsonDecode(P,['name','year'],Values) -> Values[0]^='John'; Values[1]^='1972';
// - if any supplied name wasn't found its corresponding Values[] will be nil
// - this procedure will decode the JSON content in-memory, i.e. the PUtf8Char
// array is created inside P, which is therefore modified: make a private
// copy first if you want to reuse the JSON content
// - if HandleValuesAsObjectOrArray is TRUE, then this procedure will handle
// JSON arrays or objects
// - if ValuesLen is set, ValuesLen[] will contain the length of each Values[]
// - returns a pointer to the next content item in the JSON buffer
function JsonDecode(P: PUtf8Char; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray;
  HandleValuesAsObjectOrArray: boolean = false): PUtf8Char; overload;

/// decode the supplied UTF-8 JSON object for the supplied field names
// - overloaded function expecting the names supplied as a constant array
// - slightly faster than the one using "const Names: array of RawUtf8"
function JsonDecode(P: PUtf8Char; Names: PPUtf8CharArray; NamesCount: integer;
  Values: PValuePUtf8CharArray;
  HandleValuesAsObjectOrArray: boolean = false): PUtf8Char; overload;

/// decode the supplied UTF-8 JSON object into an array of name/value pairs
// - this procedure will decode the JSON content in-memory, i.e. the PUtf8Char
// array is created inside JSON, which is therefore modified: make a private
// copy first if you want to reuse the JSON content
// - the supplied JSON buffer should stay available until Name/Value pointers
// from returned Values[] are accessed
// - if HandleValuesAsObjectOrArray is TRUE, then this procedure will handle
// JSON arrays or objects
// - support enhanced JSON syntax, e.g. '{name:'"John",year:1972}' is decoded
// just like '{"name":'"John","year":1972}'
function JsonDecode(P: PUtf8Char; out Values: TNameValuePUtf8CharDynArray;
  HandleValuesAsObjectOrArray: boolean = false): PUtf8Char; overload;

/// decode the supplied UTF-8 JSON object for the one supplied field name
// - this function will decode the JSON content in-memory, so will unescape it
// in-place: it must be called only once with the same JSON data
function JsonDecode(var Json: RawUtf8; const aName: RawUtf8 = 'result';
  WasString: PBoolean = nil;
  HandleValuesAsObjectOrArray: boolean = false): RawUtf8; overload;
  {$ifdef HASINLINE} inline; {$endif}

  /// decode the supplied UTF-8 JSON object for the one supplied field name
// - this function will decode and modify the input JSON buffer in-place
function JsonDecode(Json: PUtf8Char; const aName: RawUtf8;
  WasString: PBoolean; HandleValuesAsObjectOrArray: boolean): RawUtf8; overload;


type
  /// available options for JSON parsing process
  // - by default, parsing will fail if a JSON field name is not part of the
  // object published properties, unless jpoIgnoreUnknownProperty is defined -
  // this option will also ignore read-only properties (i.e. with only a getter)
  // - by default, function will check that the supplied JSON value will
  // be a JSON string when the property is a string, unless jpoIgnoreStringType
  // is defined and JSON numbers are accepted and stored as text
  // - by default any unexpected value for enumerations will be marked as
  // invalid, unless jpoIgnoreUnknownEnum is defined, so that in such case the
  // ordinal 0 value is left, and loading continues
  // - by default, only simple kind of variant types (string/numbers) are
  // handled: set jpoHandleCustomVariants if you want to handle any custom -
  // in this case , it will handle direct JSON [array] of {object}: but if you
  // also define jpoHandleCustomVariantsWithinString, it will also try to
  // un-escape a JSON string first, i.e. handle "[array]" or "{object}" content
  // (may be used e.g. when JSON has been retrieved from a database TEXT column)
  // - by default, a temporary instance will be created if a published field
  // has a setter, and the instance is expected to be released later by the
  // owner class: set jpoSetterExpectsToFreeTempInstance to let JsonParser
  // (and TPropInfo.ClassFromJson) release it when the setter returns, and
  // jpoSetterNoCreate to avoid the published field instance creation
  // - set jpoAllowInt64Hex to let Int64/QWord fields accept hexadecimal string
  // (as generated e.g. via the woInt64AsHex option)
  // - by default, double values won't be stored as variant values, unless
  // jpoAllowDouble is set - see also dvoAllowDoubleValue in TDocVariantOptions
  // - jpoObjectListClassNameGlobalFindClass would also search for "ClassName":
  // TObjectList serialized field with the global Classes.FindClass() function
  // - null will release any class instance, unless jpoNullDontReleaseObjectInstance
  // is set which will leave the instance untouched
  // - values will be left untouched before parsing, unless jpoClearValues
  // is defined, to void existing record fields or class published properties
  TJsonParserOption = (
    jpoIgnoreUnknownProperty,
    jpoIgnoreStringType,
    jpoIgnoreUnknownEnum,
    jpoHandleCustomVariants,
    jpoHandleCustomVariantsWithinString,
    jpoSetterExpectsToFreeTempInstance,
    jpoSetterNoCreate,
    jpoAllowInt64Hex,
    jpoAllowDouble,
    jpoObjectListClassNameGlobalFindClass,
    jpoNullDontReleaseObjectInstance,
    jpoClearValues);

  /// set of options for JsonParser() parsing process
  TJsonParserOptions = set of TJsonParserOption;

  /// efficient execution context of the JSON parser
  // - defined here for low-level use of TRttiJsonLoad functions
  // - inherit from TGetJsonField to include ParseNext/ParseNextAny unserialized
  // Value/ValueLen and flags, and Json as current position in the JSON input
  {$ifdef USERECORDWITHMETHODS}
  TJsonParserContext = record
  public
    Get: TGetJsonField;
    function Json: PUtf8Char;       {$ifdef HASINLINE} inline; {$endif}
    function Value: PUtf8Char;      {$ifdef HASINLINE} inline; {$endif}
    function ValueLen: PtrInt;      {$ifdef HASINLINE} inline; {$endif}
    function WasString: boolean;    {$ifdef HASINLINE} inline; {$endif}
    function EndOfObject: AnsiChar; {$ifdef HASINLINE} inline; {$endif}
  {$else}
  TJsonParserContext = object(TGetJsonField)
  {$endif USERECORDWITHMETHODS}
  public
    /// true if the last parsing succeeded
    Valid: boolean;
    /// customize parsing
    Options: TJsonParserOptions;
    /// how TDocVariant should be created
    CustomVariant: PDocVariantOptions;
    /// contains the current value RTTI
    Info: TRttiCustom;
    /// contains the current property value RTTI
    Prop: PRttiCustomProp;
    /// force the item class when reading a TObjectList without "ClassName":...
    ObjectListItem: TRttiCustom;
    /// optional RawUtf8 values interning
    Interning: TRawUtf8Interning;
    /// TDocVariant initialization options
    DVO: TDocVariantOptions;
    /// initialize this unserialization context
    procedure InitParser(P: PUtf8Char; Rtti: TRttiCustom; O: TJsonParserOptions;
      CV: PDocVariantOptions; ObjectListItemClass: TClass;
      RawUtf8Interning: TRawUtf8Interning);
    /// call inherited GetJsonField() to retrieve the next JSON value
    // - on success, return true and set Value/ValueLen and WasString fields
    function ParseNext: boolean;
      {$ifdef HASINLINE}inline;{$endif}
    /// call inherited GetJsonFieldOrObjectOrArray() to retrieve the next JSON value
    // - on success, return true and set Value/ValueLen and WasString fields
    function ParseNextAny: boolean;
      {$ifdef HASINLINE}inline;{$endif}
    /// retrieve the next JSON value as UTF-8 text
    function ParseUtf8: RawUtf8;
    /// retrieve the next JSON value as RTL string text
    function ParseString: string;
    /// retrieve the next JSON value as integer
    function ParseInteger: Int64;
    /// set the EndOfObject field of a JSON buffer, just like GetJsonField() does
    // - to be called whan a JSON object or JSON array has been manually parsed
    procedure ParseEndOfObject;
      {$ifdef HASINLINE}inline;{$endif}
    /// parse a 'null' value from JSON buffer
    function ParseNull: boolean;
      {$ifdef HASINLINE}inline;{$endif}
    /// parse initial '[' token from JSON buffer
    // - once all the nested values have been read, call ParseEndOfObject
    function ParseArray: boolean;
    /// parse initial '{' token from JSON buffer
    // - once all the nested values have been read, call ParseEndOfObject
    function ParseObject: boolean; overload;
    /// wrapper around JsonDecode() to easily get JSON object values
    function ParseObject(const Names: array of RawUtf8;
      Values: PValuePUtf8CharArray;
      HandleValuesAsObjectOrArray: boolean = false): boolean; overload;
    /// parse a JSON object from the buffer into a
    // - if ObjectListItem was not defined, expect the JSON input to start as
    // '{"ClassName":"TMyClass",...}'
    function ParseNewObject: TObject;
      {$ifdef HASINLINE}inline;{$endif}
    /// parse a property value, properly calling any setter
    procedure ParsePropComplex(Data: pointer);
  end;

  PJsonParserContext = ^TJsonParserContext;

  /// internal function handler for JSON reading of any TRttiParserType value
  TRttiJsonLoad = procedure(Data: pointer; var Ctxt: TJsonParserContext);


var
  /// default options for the JSON parser
  // - as supplied to LoadJson() with Tolerant=false
  // - defined as var, not as const, to allow process-wide override
  JSONPARSER_DEFAULTOPTIONS: TJsonParserOptions = [];

  /// some open-minded options for the JSON parser
  // - as supplied to LoadJson() with Tolerant=true
  // - won't block JSON unserialization due to some minor unexpected values
  // - used e.g. by TObjArraySerializer.CustomReader and
  // TInterfacedObjectFake.FakeCall/TServiceMethodExecute.ExecuteJson methods
  // - defined as var, not as const, to allow process-wide override
  JSONPARSER_TOLERANTOPTIONS: TJsonParserOptions =
    [jpoHandleCustomVariants, jpoIgnoreUnknownEnum,
     jpoIgnoreUnknownProperty, jpoIgnoreStringType, jpoAllowInt64Hex];

  /// access default (false) or tolerant (true) JSON parser options
  // - to be used as JSONPARSER_DEFAULTORTOLERANTOPTIONS[tolerant]
  JSONPARSER_DEFAULTORTOLERANTOPTIONS: array[boolean] of TJsonParserOptions = (
    [],
    [jpoHandleCustomVariants, jpoIgnoreUnknownEnum,
     jpoIgnoreUnknownProperty, jpoIgnoreStringType, jpoAllowInt64Hex]);

// backward compatibility types redirections
{$ifndef PUREMORMOT2}

type
  TJsonToObjectOption = TJsonParserOption;
  TJsonToObjectOptions = TJsonParserOptions;

const
  j2oSQLRawBlobAsBase64 = woRawBlobAsBase64;
  j2oIgnoreUnknownProperty = jpoIgnoreUnknownProperty;
  j2oIgnoreStringType = jpoIgnoreStringType;
  j2oIgnoreUnknownEnum = jpoIgnoreUnknownEnum;
  j2oHandleCustomVariants = jpoHandleCustomVariants;
  j2oHandleCustomVariantsWithinString = jpoHandleCustomVariantsWithinString;
  j2oSetterExpectsToFreeTempInstance = jpoSetterExpectsToFreeTempInstance;
  j2oSetterNoCreate = jpoSetterNoCreate;
  j2oAllowInt64Hex = jpoAllowInt64Hex;

const
  JSONTOOBJECT_TOLERANTOPTIONS: TJsonParserOptions =
    [jpoHandleCustomVariants, jpoIgnoreUnknownEnum,
     jpoIgnoreUnknownProperty, jpoIgnoreStringType, jpoAllowInt64Hex];

{$endif PUREMORMOT2}


{ ********** Custom JSON Serialization }

type
  /// the callback signature used by TRttiJson for serializing JSON data
  // - Data^ should be written into W, with the supplied Options
  TOnRttiJsonWrite = procedure(W: TJsonWriter; Data: pointer;
    Options: TTextWriterWriteObjectOptions) of object;

  /// the callback signature used by TRttiJson for unserializing JSON data
  // - set Context.Valid=true if Context.JSON has been parsed into Data^
  TOnRttiJsonRead = procedure(var Context: TJsonParserContext;
    Data: pointer) of object;

  /// the callback signature used by TRttiJson for serializing JSON classes
  // - Instance should be written into W, with the supplied Options
  // - is in fact a convenient alias to the TOnRttiJsonWrite callback
  TOnClassJsonWrite = procedure(W: TJsonWriter; Instance: TObject;
    Options: TTextWriterWriteObjectOptions) of object;

  /// the callback signature used by TRttiJson for unserializing JSON classes
  // - set Context.Valid=true if Context.JSON has been parsed into Instance
  // - is in fact a convenient alias to the TOnRttiJsonRead callback
  TOnClassJsonRead = procedure(var Context: TJsonParserContext;
    Instance: TObject) of object;

  /// JSON-aware TRttiCustom class - used for global RttiCustom: TRttiCustomList
  TRttiJson = class(TRttiCustom)
  protected
    fCompare: array[{CaseInsens:}boolean] of TRttiCompare; // for ValueCompare
    fIncludeReadOptions: TJsonParserOptions;
    fIncludeWriteOptions: TTextWriterWriteObjectOptions;
    // overriden for proper JSON process - set fJsonSave and fJsonLoad
    function SetParserType(aParser: TRttiParserType;
      aParserComplex: TRttiParserComplexType): TRttiCustom; override;
    procedure SetValueClass(aClass: TClass; aInfo: PRttiInfo); override;
  public
    /// simple wrapper around TRttiJsonSave(fJsonSave)
    procedure RawSaveJson(Data: pointer; const Ctxt: TJsonSaveContext);
      {$ifdef HASINLINE}inline;{$endif}
    /// simple wrapper around TRttiJsonLoad(fJsonLoad)
    procedure RawLoadJson(Data: pointer; var Ctxt: TJsonParserContext);
      {$ifdef HASINLINE}inline;{$endif}
    /// create and parse a new TObject instance of this rkClass
    function ParseNewInstance(var Context: TJsonParserContext): TObject;
    /// compare two stored values of this type
    function ValueCompare(Data, Other: pointer; CaseInsensitive: boolean): integer; override;
    /// fill a variant with a stored value of this type
    // - complex values can be returned as TDocVariant after JSON conversion,
    // using e.g. @JSON_[mFast] as optional Options parameter
    function ValueToVariant(Data: pointer; out Dest: TVarData;
      Options: pointer{PDocVariantOptions} = nil): PtrInt; override;
    /// unserialize some JSON input into Data^
    // - as used by LoadJson() and similar high-level functions
    procedure ValueLoadJson(Data: pointer; var Json: PUtf8Char; EndOfObject: PUtf8Char;
      ParserOptions: TJsonParserOptions; CustomVariantOptions: PDocVariantOptions;
      ObjectListItemClass: TClass; Interning: TRawUtf8Interning);
    /// how many iterations could be done one a given value
    // - returns -1 if the value is not iterable, or length(DynArray) or
    // TRawUtf8List.Count or TList.Count or TSynList.Count
    // - note that TStrings values are not supported, because they require a
    // temporary string variable for their getter
    function ValueIterateCount(Data: pointer): integer; override;
    /// iterate over one sub-item of a given value
    // - returns nil if the value is not iterable or Index is out of range
    // - returns a pointer to the value, rkClass/rkLString kinds being already
    // resolved (as the TList/TSynList/TRawUtf8List items are returned),
    // so you can directly trans-type the result to TObject() or RawUtf8()
    // - ResultRtti holds the type of the resolved result pointer
    // - note that TStrings values are not supported, because they require a
    // temporary string variable for their getter method
    function ValueIterate(Data: pointer; Index: PtrUInt;
      out ResultRtti: TRttiCustom): pointer; override;
    /// lookup a value by a path name e.g. 'one.two.three' nested values
    // - for a record/class, will search for a property name
    // - for a TDocVariant/TBsonVariant, calls TSynInvokeableVariantType.IntGet
    // - for an enumeration or set, will return true/false about the enum name
    // - for a string, Data^ will be compared to the name
    function ValueByPath(var Data: pointer; Path: PUtf8Char; var Temp: TVarData;
      PathDelim: AnsiChar = '.'): TRttiCustom; override;
    /// efficient search of TRttiJson from a given RTTI TypeInfo()
    // - to be used instead of Rtti.Find() to return directly the TRttiJson instance
    class function Find(Info: PRttiInfo): TRttiJson;
      {$ifdef HASINLINE}inline;{$endif}
    /// register a custom callback for JSON serialization of a given TypeInfo()
    // - for a dynamic array, will customize the item serialization callbacks
    // - replace deprecated TTextWriter.RegisterCustomJSONSerializer() method
    class function RegisterCustomSerializer(Info: PRttiInfo;
      const Reader: TOnRttiJsonRead; const Writer: TOnRttiJsonWrite): TRttiJson;
    /// unregister any custom callback for JSON serialization of a given TypeInfo()
    // - will also work after RegisterFromText()
    class function UnRegisterCustomSerializer(Info: PRttiInfo): TRttiJson;
    /// register a custom callback for JSON serialization of a given class
    // - replace deprecated TTextWriter.RegisterCustomJSONSerializer() method
    class function RegisterCustomSerializerClass(ObjectClass: TClass;
      const Reader: TOnClassJsonRead; const Writer: TOnClassJsonWrite): TRttiJson;
    /// unregister any custom callback for JSON serialization of a given class
    class function UnRegisterCustomSerializerClass(ObjectClass: TClass): TRttiJson;
    /// register TypeInfo() custom JSON serialization for a given dynamic
    // array or record
    // - to be used instead of homonomous Rtti.RegisterFromText() to supply
    // an additional set of serialization/unserialization JSON options
    class function RegisterFromText(DynArrayOrRecord: PRttiInfo;
      const RttiDefinition: RawUtf8;
      IncludeReadOptions: TJsonParserOptions;
      IncludeWriteOptions: TTextWriterWriteObjectOptions): TRttiJson;
    /// define an additional set of unserialization JSON options
    // - is included for this type to the supplied TJsonParserOptions
    property IncludeReadOptions: TJsonParserOptions
      read fIncludeReadOptions write fIncludeReadOptions;
    /// define an additional set of serialization JSON options
    // - is included for this type to the supplied TTextWriterWriteObjectOptions
    property IncludeWriteOptions: TTextWriterWriteObjectOptions
      read fIncludeWriteOptions write fIncludeWriteOptions;
  end;


{ ********** JSON Serialization Wrapper Functions }

/// encode the supplied data as an UTF-8 valid JSON object content
// - data must be supplied two by two, as Name,Value pairs, e.g.
// ! JsonEncode(['name','John','year',1972]) = '{"name":"John","year":1972}'
// - or you can specify nested arrays or objects with '['..']' or '{'..'}':
// ! J := JsonEncode(['doc','{','name','John','abc','[','a','b','c',']','}','id',123]);
// ! assert(J='{"doc":{"name":"John","abc":["a","b","c"]},"id":123}');
// - note that, due to a Delphi compiler limitation, cardinal values should be
// type-casted to Int64() (otherwise the integer mapped value will be converted)
// - you can pass nil as parameter for a null JSON value
function JsonEncode(const NameValuePairs: array of const): RawUtf8; overload;

/// encode the supplied (extended) JSON content, with parameters,
// as an UTF-8 valid JSON object content
// - in addition to the JSON RFC specification strict mode, this method will
// handle some BSON-like extensions, e.g. unquoted field names:
// ! aJson := JsonEncode('{id:?,%:{name:?,birthyear:?}}',['doc'],[10,'John',1982]);
// - you can use nested _Obj() / _Arr() instances
// ! aJson := JsonEncode('{%:{$in:[?,?]}}',['type'],['food','snack']);
// ! aJson := JsonEncode('{type:{$in:?}}',[],[_Arr(['food','snack'])]);
// ! // will both return
// ! '{"type":{"$in":["food","snack"]}}')
// - if the mormot.db.nosql.bson unit is used in the application, the MongoDB
// Shell syntax will also be recognized to create TBsonVariant, like
// ! new Date()   ObjectId()   MinKey   MaxKey  /<jRegex>/<jOptions>
// see @http://docs.mongodb.org/manual/reference/mongodb-extended-json
// !  aJson := JsonEncode('{name:?,field:/%/i}',['acme.*corp'],['John']))
// ! // will return
// ! '{"name":"John","field":{"$regex":"acme.*corp","$options":"i"}}'
// - will call internally _JsonFastFmt() to create a temporary TDocVariant with
// all its features - so is slightly slower than other JsonEncode* functions
function JsonEncode(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8; overload;

/// encode the supplied RawUtf8 array data as an UTF-8 valid JSON array content
function JsonEncodeArrayUtf8(
  const Values: array of RawUtf8): RawUtf8; overload;

/// encode the supplied integer array data as a valid JSON array
function JsonEncodeArrayInteger(
  const Values: array of integer): RawUtf8; overload;

/// encode the supplied floating-point array data as a valid JSON array
function JsonEncodeArrayDouble(
  const Values: array of double): RawUtf8; overload;

/// encode the supplied array data as a valid JSON array content
// - if WithoutBraces is TRUE, no [ ] will be generated
// - note that, due to a Delphi compiler limitation, cardinal values should be
// type-casted to Int64() (otherwise the integer mapped value will be converted)
function JsonEncodeArrayOfConst(const Values: array of const;
  WithoutBraces: boolean = false): RawUtf8; overload;

/// encode the supplied array data as a valid JSON array content
// - if WithoutBraces is TRUE, no [ ] will be generated
// - note that, due to a Delphi compiler limitation, cardinal values should be
// type-casted to Int64() (otherwise the integer mapped value will be converted)
procedure JsonEncodeArrayOfConst(const Values: array of const;
  WithoutBraces: boolean; var result: RawUtf8); overload;

/// encode as JSON {"name":value} object, from a potential SQL quoted value
// - will unquote the SQLValue using TJsonWriter.AddQuotedStringAsJson()
procedure JsonEncodeNameSQLValue(const Name, SQLValue: RawUtf8;
  var result: RawUtf8);


var
  /// the options used by TObjArraySerializer, TInterfacedObjectFake and
  // TServiceMethodExecute when serializing values as JSON
  // - used as DEFAULT_WRITEOPTIONS[DontStoreVoidJson]
  // - you can modify this global variable to customize the whole process
  DEFAULT_WRITEOPTIONS: array[boolean] of TTextWriterWriteObjectOptions = (
    [woDontStoreDefault, woRawBlobAsBase64],
    [woDontStoreDefault, woDontStoreVoid, woRawBlobAsBase64]);

  /// the options used by TSynJsonFileSettings.SaveIfNeeded
  // - you can modify this global variable to customize the whole process
  SETTINGS_WRITEOPTIONS: TTextWriterWriteObjectOptions =
    [woHumanReadable, woStoreStoredFalse, woHumanReadableFullSetsAsStar,
     woHumanReadableEnumSetAsComment, woInt64AsHex];

  /// the options used by TServiceFactoryServer.OnLogRestExecuteMethod
  // - you can modify this global variable to customize the whole process
  SERVICELOG_WRITEOPTIONS: TTextWriterWriteObjectOptions =
    [woDontStoreDefault, woDontStoreVoid, woHideSensitivePersonalInformation];


/// serialize most kind of content as JSON, using its RTTI
// - is just a wrapper around TJsonWriter.AddTypedJson()
// - so would handle tkClass, tkEnumeration, tkSet, tkRecord, tkDynArray,
// tkVariant kind of content - other kinds would return 'null'
// - you can override serialization options if needed
procedure SaveJson(const Value; TypeInfo: PRttiInfo;
  Options: TTextWriterOptions; var result: RawUtf8;
  ObjectOptions: TTextWriterWriteObjectOptions = []); overload;

/// serialize most kind of content as JSON, using its RTTI
// - is just a wrapper around TJsonWriter.AddTypedJson()
function SaveJson(const Value; TypeInfo: PRttiInfo;
  EnumSetsAsText: boolean): RawUtf8; overload;
  {$ifdef HASINLINE}inline;{$endif}

/// serialize most kind of content as JSON, using its RTTI
function SaveJson(const Value; TypeInfo: PRttiInfo): RawUtf8; overload;

/// serialize most kind of content as JSON, using its RTTI and a type name
// - could be used if you know the type name and not the TypeInfo()
// - will use Rtti.RegisterTypeFromName() so the type should be known, i.e. be
// a simple type, or have been alredy registered
// - returns '' if TypeName is not recognized
function SaveJson(const Value; const TypeName: RawUtf8;
  Options: TTextWriterOptions = []): RawUtf8; overload;

{$ifdef FPC}
/// special global function exported to Lazarus for runtime evaluation, within
// latest trunk fpdebug, of any variable as JSON, using mORMot RTTI
// - the "JsonForDebug" function name is recognized by recent fpdebug, and
// called and try to serialize a variable as JSON in Lazarus debug windows - see
// https://wiki.freepascal.org/IDE_Window:_Ide_Options_-_Backend_Value_Converter
// - this function will recognize 1) all type names registered to mORMot RTTI
// (using Rtti.Register*() methods), 2) T* class types guessing from their VMT,
// 3) I* types recognized as interface, and their associated "as TObject" class
// instance will be serialized
procedure JsonForDebug(Value: pointer; var TypeName: RawUtf8;
  out JsonResultText: RawUtf8);
{$endif FPC}

/// save record into its JSON serialization as saved by TJsonWriter.AddRecordJson
// - will use default Base64 encoding over RecordSave() binary - or custom true
// JSON format (as set by Rtti.RegisterFromText/TRttiJson.RegisterCustomSerializer
// or via enhanced RTTI), if available (following EnumSetsAsText optional
// parameter for nested enumerates and sets)
function RecordSaveJson(const Rec; TypeInfo: PRttiInfo;
  EnumSetsAsText: boolean = false): RawUtf8;
  {$ifdef HASINLINE}inline;{$endif}

/// serialize a dynamic array content as JSON
// - Value shall be set to the source dynamic array field
// - is just a wrapper around TJsonWriter.AddDynArrayJson(), creating
// a temporary TDynArray wrapper on the stack
// - to be used e.g. for custom record JSON serialization, within a
// TDynArrayJsonCustomWriter callback or Rtti.RegisterFromText()
// (following EnumSetsAsText optional parameter for nested enumerates and sets)
function DynArraySaveJson(const Value; TypeInfo: PRttiInfo;
  EnumSetsAsText: boolean = false): RawUtf8;

/// serialize a dynamic array content, supplied as raw binary buffer, as JSON
// - Value shall be set to the source dynamic array field
// - is just a wrapper around TJsonWriter.AddDynArrayJson(), creating
// a temporary TDynArray wrapper on the stack
// - to be used e.g. for custom record JSON serialization, within a
// TDynArrayJsonCustomWriter callback or Rtti.RegisterFromText()
function DynArrayBlobSaveJson(TypeInfo: PRttiInfo; BlobValue: pointer;
  BlobLen: PtrInt): RawUtf8;

/// wrapper to serialize a T*ObjArray dynamic array as JSON
// - for proper serialization on Delphi 7-2009, use Rtti.RegisterObjArray()
function ObjArrayToJson(const aObjArray;
  aOptions: TTextWriterWriteObjectOptions = [woDontStoreDefault]): RawUtf8;

/// will serialize set of TObject into its UTF-8 JSON representation
// - follows ObjectToJson()/TJsonWriter.WriterObject() functions output
// - if Names is not supplied, the corresponding class names would be used
function ObjectsToJson(const Names: array of RawUtf8; const Values: array of TObject;
  Options: TTextWriterWriteObjectOptions = [woDontStoreDefault]): RawUtf8;

/// persist a class instance into a JSON file
// - returns TRUE on success, false on error (e.g. the file name is invalid
// or the file is existing and could not be overwritten)
// - see ObjectToJson() as defined in momrot.core.text.pas
function ObjectToJsonFile(Value: TObject; const JsonFile: TFileName;
  Options: TTextWriterWriteObjectOptions = [woHumanReadable]): boolean;

/// get any (potentially nested) object property by path
// - complex values (e.g. dynamic array properties) will be returned as
// TDocVariant after JSON conversion
function GetValueObject(Instance: TObject; const Path: RawUtf8;
  out Value: variant): boolean;

/// unserialize most kind of content as JSON, using its RTTI, as saved by
// TJsonWriter.AddRecordJson / RecordSaveJson
// - same implementation than GetDataFromJson() global low-level function
// - returns nil on error, or the end of buffer on success
// - warning: the JSON buffer will be modified in-place during process - use
// LoadJson() instead or a make temporary copy if you need to access it later
function LoadJsonInPlace(var Value; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char = nil; CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): PUtf8Char;

/// unserialize most kind of content as JSON, using its RTTI, as saved by
// TJsonWriter.AddRecordJson / RecordSaveJson
// - this overloaded function will make a private copy before parsing it,
// so is safe with a read/only or shared string - but slightly slower
function LoadJson(var Value; const Json: RawUtf8; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char = nil; CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): boolean;

/// fill a record content from a JSON serialization as saved by
// TJsonWriter.AddRecordJson / RecordSaveJson
// - will use default Base64 encoding over RecordSave() binary - or custom
// JSON format (as set by Rtti.RegisterFromText/TRttiJson.RegisterCustomSerializer
// or via enhanced RTTI), if available
// - returns nil on error, or the end of buffer on success
// - warning: the JSON buffer will be modified in-place during process - use
// a temporary copy if you need to access it later or if the string comes from
// a constant (refcount=-1) - see e.g. the overloaded RecordLoadJson()
function RecordLoadJson(var Rec; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char = nil; CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): PUtf8Char; overload;

/// fill a record content from a JSON serialization as saved by
// TJsonWriter.AddRecordJson / RecordSaveJson
// - this overloaded function will make a private copy before parsing it,
// so is safe with a read/only or shared string - but slightly slower
function RecordLoadJson(var Rec; const Json: RawUtf8; TypeInfo: PRttiInfo;
  CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): boolean; overload;

/// fill a dynamic array content from a JSON serialization as saved by
// TJsonWriter.AddDynArrayJson with or without twoNonExpandedArrays layout
// - Value shall be set to the target dynamic array field
// - return a pointer at the end of the data read from JSON, nil in case
// of an invalid input buffer
// - could be used e.g. for custom record JSON unserialization, within a
// TDynArrayJsonCustomReader callback
// - warning: the JSON buffer will be modified in-place during process - use
// a temporary copy if you need to access it later or if the string comes from
// a constant (refcount=-1) - see e.g. the overloaded DynArrayLoadJson()
// - some numbers on a Core i5-13500, extracted from our regression tests:
// $ DynArrayLoadJson exp in 32.86ms i.e. 4.7M rows/s, 596.5 MB/s
// $ DynArrayLoadJson non exp in 22.46ms i.e. 6.9M rows/s, 383.7 MB/s
function DynArrayLoadJson(var Value; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char = nil; CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): PUtf8Char; overload;

/// fill a dynamic array content from a JSON serialization as saved by
// TJsonWriter.AddDynArrayJson, which won't be modified
// - this overloaded function will make a private copy before parsing it,
// so is safe with a read/only or shared string - but slightly slower
function DynArrayLoadJson(var Value; const Json: RawUtf8;
  TypeInfo: PRttiInfo; CustomVariantOptions: PDocVariantOptions = nil;
  Tolerant: boolean = true; Interning: TRawUtf8Interning = nil): boolean; overload;

/// read an object properties, as saved by ObjectToJson function
// - ObjectInstance must be an existing TObject instance
// - the data inside From^ is modified in-place (unescaped and transformed):
// calling JsonToObject(pointer(JSONRawUtf8)) will change the JSONRawUtf8
// variable content, which may not be what you expect - consider using the
// ObjectLoadJson() function instead
// - handle integer, Int64, enumerate (including boolean), set, floating point,
// TDateTime, TCollection, TStrings, TRawUtf8List, variant, and string properties
// (excluding ShortString, but including WideString and UnicodeString under
// Delphi 2009+)
// - TList won't be handled since it may leak memory when calling TList.Clear
// - won't handle TObjectList (even if ObjectToJson is able to serialize
// them) since has no way of knowing the object type to add (TCollection.Add
// is missing), unless: 1. you set the TObjectListItemClass property as expected,
// and provide a TObjectList object, or 2. woStoreClassName option has been
// used at ObjectToJson() call and the corresponding classes have been previously
// registered by Rtti.RegisterClass()
// - will clear any previous TCollection objects, and convert any null JSON
// basic type into nil - e.g. if From='null', will call FreeAndNil(Value)
// - you can add some custom (un)serializers for ANY class, via mormot.core.json
// TRttiJson.RegisterCustomSerializer() class method
// - set Valid=TRUE on success, Valid=FALSE on error, and the main function
// will point in From at the syntax error place (e.g. on any unknown property name)
// - caller should explicitly perform a SetDefaultValuesObject(Value) if
// the default values are expected to be set before JSON parsing
function JsonToObject(var ObjectInstance; From: PUtf8Char;
  out Valid: boolean; TObjectListItemClass: TClass = nil;
  Options: TJsonParserOptions = []; Interning: TRawUtf8Interning = nil): PUtf8Char;

/// parse the supplied JSON with some tolerance about Settings format
// - will make a TSynTempBuffer copy for parsing, and un-comment it
// - returns true if the supplied JSON was successfully retrieved
// - returns false on error
function JsonSettingsToObject(const JsonContent: RawUtf8;
  Instance: TObject): boolean;

/// read an object properties, as saved by ObjectToJson function
// - ObjectInstance must be an existing TObject instance
// - this overloaded version will make a private copy of the supplied JSON
// content (via TSynTempBuffer), to ensure the original buffer won't be modified
// during process, before calling safely JsonToObject()
// - will return TRUE on success, or FALSE if the supplied JSON was invalid
function ObjectLoadJson(var ObjectInstance; const Json: RawUtf8;
  TObjectListItemClass: TClass = nil; Options: TJsonParserOptions = [];
  Interning: TRawUtf8Interning = nil): boolean;

/// create a new object instance, as saved by ObjectToJson(...,[...,woStoreClassName,...]);
// - JSON input should be either 'null', either '{"ClassName":"TMyClass",...}'
// - woStoreClassName option shall have been used at ObjectToJson() call
// - and the corresponding class shall have been previously registered by
// Rtti.RegisterClass() to retrieve the class type from it name
// - the data inside From^ is modified in-place (unescaped and transformed):
// don't call JsonToObject(pointer(JSONRawUtf8)) but makes a temporary copy of
// the JSON text buffer before calling this function, if want to reuse it later
function JsonToNewObject(var From: PUtf8Char; var Valid: boolean;
  Options: TJsonParserOptions = []; Interning: TRawUtf8Interning = nil): TObject;

/// read an TObject published property, as saved by ObjectToJson() function
// - will use direct in-memory reference to the object, or call the corresponding
// setter method (if any), creating a temporary instance
// - unserialize the JSON input buffer via a call to JsonToObject()
// - by default, a temporary instance will be created if a published field
// has a setter, and the instance is expected to be released later by the
// owner class: you can set the j2oSetterExpectsToFreeTempInstance option
// to let this method release it when the setter returns
function PropertyFromJson(Prop: PRttiCustomProp; Instance: TObject;
  From: PUtf8Char; var Valid: boolean; Options: TJsonParserOptions = [];
  Interning: TRawUtf8Interning = nil): PUtf8Char;

/// decode a specified parameter compatible with URI encoding into its original
// object contents
// - ObjectInstance must be an existing TObject instance
// - will call internally JsonToObject() function to unserialize its content
// - UrlDecodeExtended('price=20.45&where=LastName%3D%27M%C3%B4net%27','PRICE=',P,@Next)
// will return Next^='where=...' and P=20.45
// - if Upper is not found, Value is not modified, and result is FALSE
// - if Upper is found, Value is modified with the supplied content, and result is TRUE
function UrlDecodeObject(U: PUtf8Char; Upper: PAnsiChar;
  var ObjectInstance; Next: PPUtf8Char = nil;
  Options: TJsonParserOptions = []): boolean;

/// fill the object properties from a JSON file content
// - ObjectInstance must be an existing TObject instance
// - this function will call RemoveCommentsFromJson() before process
function JsonFileToObject(const JsonFile: TFileName; var ObjectInstance;
  TObjectListItemClass: TClass = nil; Options: TJsonParserOptions = [];
  Interning: TRawUtf8Interning = nil): boolean;


const
  /// standard header for an UTF-8 encoded XML file
  XMLUTF8_HEADER = '<?xml version="1.0" encoding="UTF-8"?>'#13#10;

  /// standard namespace for a generic XML File
  XMLUTF8_NAMESPACE = '<contents xmlns="http://www.w3.org/2001/XMLSchema-instance">';

/// convert a JSON array or document into a simple XML content
// - just a wrapper around TJsonWriter.AddJsonToXML, with an optional
// header before the XML converted data (e.g. XMLUTF8_HEADER), and an optional
// name space content node which will nest the generated XML data (e.g.
// '<contents xmlns="http://www.w3.org/2001/XMLSchema-instance">') - the
// corresponding ending token will be appended after (e.g. '</contents>')
// - WARNING: the JSON buffer is decoded in-place, so P^ WILL BE modified
procedure JsonBufferToXML(P: PUtf8Char; const Header, NameSpace: RawUtf8;
  out result: RawUtf8);

/// convert a JSON array or document into a simple XML content
// - just a wrapper around TJsonWriter.AddJsonToXML, making a private copy
// of the supplied JSON buffer using TSynTempBuffer (so that JSON content
// would stay untouched)
// - the optional header is added at the beginning of the resulting string
// - an optional name space content node could be added around the generated XML,
// e.g. '<content>'
function JsonToXML(const Json: RawUtf8; const Header: RawUtf8 = XMLUTF8_HEADER;
  const NameSpace: RawUtf8 = ''): RawUtf8;


{ ********************* Abstract Classes with Auto-Create-Fields }

/// should be called by T*AutoCreateFields constructors
// - will also register this class type, if needed, so RegisterClass() is
// redundant to this method
function AutoCreateFields(ObjectInstance: TObject): TRttiJson;
  {$ifdef HASINLINE}inline;{$endif}

/// should be called by T*AutoCreateFields destructors
// - constructor should have called AutoCreateFields()
procedure AutoDestroyFields(ObjectInstance: TObject; Info: TRttiJson = nil);
  {$ifdef HASINLINE}inline;{$endif}

/// internal function called by AutoCreateFields() when inlined
// - do not call this internal function, but always AutoCreateFields()
function DoRegisterAutoCreateFields(ObjectInstance: TObject): TRttiJson;


type
  /// abstract TPersistent class, which will instantiate all its nested class
  // published properties, then release them (and any T*ObjArray) when freed
  // - TSynAutoCreateFields is to be preferred in most cases, thanks to its
  // lower overhead
  // - note that non published (e.g. public) properties won't be instantiated,
  // serialized, nor released - but may contain weak references to other classes
  // - please take care that you will not create any endless recursion: you should
  // ensure that at one level, nested published properties won't have any class
  // instance refering to its owner (there is no weak reference - remember!)
  // - since the destructor will release all nested properties, you should
  // never store a reference to any of those nested instances if this owner
  // may be freed before
  TPersistentAutoCreateFields = class(TPersistentWithCustomCreate)
  public
    /// this overriden constructor will instantiate all its nested
    // class or T*ObjArray published properties
    constructor Create; override;
    /// finalize the instance, and its class or T*ObjArray published properties
    destructor Destroy; override;
  end;

  /// our own empowered TPersistentAutoCreateFields-like parent class
  // - this class is a perfect parent to store any data by value, e.g. DDD Value
  // Objects, Entities or Aggregates
  // - is defined as an abstract class able with a virtual constructor, RTTI
  // for published properties, and automatic memory management of all nested
  // class published properties: any class defined as a published property will
  // be owned by this instance - i.e. with strong reference
  // - will also release any T*ObjArray dynamic array storage of persistents,
  // previously registered via Rtti.RegisterObjArray() for Delphi 7-2009
  // - nested published classes (or T*ObjArray) don't need to inherit from
  // TSynAutoCreateFields: they may be from any TPersistent/TSynPersistent type
  // - note that non published (e.g. public) properties won't be instantiated,
  // serialized, nor released - but may contain weak references to other classes
  // - please take care that you will not create any endless recursion: you should
  // ensure that at one level, nested published properties won't have any class
  // instance refering to its owner (there is no weak reference - remember!)
  // - since the destructor will release all nested properties, you should
  // never store a reference to any of those nested instances if this owner
  // may be freed before
  // - TPersistent/TPersistentAutoCreateFields have an unexpected speed overhead
  // due a giant lock introduced to manage property name fixup resolution
  // (which we won't use outside the UI) - this class is definitively faster
  TSynAutoCreateFields = class(TSynPersistent)
  public
    /// this overriden constructor will instantiate all its nested
    // class or T*ObjArray published properties
    constructor Create; override;
    /// finalize the instance, and its class or T*ObjArray published properties
    destructor Destroy; override;
  end;
  /// meta-class definition of TSynAutoCreateFields
  TSynAutoCreateFieldsClass = class of TSynAutoCreateFields;

  /// adding locking methods to a TSynAutoCreateFields with virtual constructor
  TSynAutoCreateFieldsLocked = class(TSynPersistentLock)
  public
    /// initialize the object instance, its associated lock, and its nested
    // class or T*ObjArray published properties
    constructor Create; override;
    /// release the instance (including the locking resource) and nested classes
    destructor Destroy; override;
  end;
  /// meta-class definition of TSynAutoCreateFieldsLocked
  TSynAutoCreateFieldsLockedClass = class of TSynAutoCreateFieldsLocked;

  /// abstract TInterfacedObject class, which will instantiate all its nested
  // class published properties, then release them when freed
  // - will handle automatic memory management of all nested class and T*ObjArray
  // published properties: any class or T*ObjArray defined as a published
  // property will be owned by this instance - i.e. with strong reference
  // - non published properties (e.g. public) won't be instantiated, so may
  // store weak class references
  // - could be used for gathering of TCollectionItem properties, e.g. for
  // Domain objects in DDD, especially for list of value objects, with some
  // additional methods defined by an Interface
  // - since the destructor will release all nested properties, you should
  // never store a reference to any of those nested instances if this owner
  // may be freed before
  TInterfacedObjectAutoCreateFields = class(TInterfacedObjectWithCustomCreate)
  public
    /// this overriden constructor will instantiate all its nested
    // class or T*ObjArray published properties
    constructor Create; override;
    /// finalize the instance, and release its published properties
    destructor Destroy; override;
  end;
  /// meta-class definition of TInterfacedObjectAutoCreateFields
  TInterfacedObjectAutoCreateFieldsClass = class of TInterfacedObjectAutoCreateFields;

  /// abstract interface parent with common methods for JSON serialization
  // - to implement this, you can inherit from TInterfacedSerializable
  // or TInterfacedSerializableAutoCreateFields
  ISerializable = interface
    ['{EA7F298D-06D7-4ADF-9F75-6598B75338B3}']
    // methods used as getter/setter for the Json property
    function GetJson: RawUtf8;
    procedure SetJson(const value: RawUtf8);
    /// serialize this instance into a JSON array/object specific format
    function ToJson(format: TTextWriterJsonFormat;
      options: TTextWriterWriteObjectOptions = []): RawUtf8; overload;
    /// convert this instance into JSON array/object as RTL string
    function ToString(format: TTextWriterJsonFormat = jsonCompact;
      options: TTextWriterWriteObjectOptions = []): string;
    /// raw unserialization of a JSON content into this instance
    procedure FromJson(var Context: TJsonParserContext);
    /// raw serialization of this instance into a JSON writer
    procedure ToJson(W: TJsonWriter; options: TTextWriterWriteObjectOptions); overload;
    /// unserialize/serialize this IDocList/IDocDict from/into a JSON array/object
    // - use ToString if you want the result as RTL string
    property Json: RawUtf8
      read GetJson write SetJson;
  end;

  {$M+}
  /// abstract class parent with ISerializable methods for JSON serialization
  // - you need to override Create, ToJson and FromJson abstract methods
  TInterfacedSerializable = class(TInterfacedObject, ISerializable)
  protected
    // methods used as getter/setter for the Json property
    function GetJson: RawUtf8;
    procedure SetJson(const value: RawUtf8); virtual;
    // used internally for proper ISerializable instances serialization
    class function SerializableInterface: TRttiCustom;
      {$ifdef HASINLINE} inline; {$endif}
    class procedure JS(W: TJsonWriter; data: pointer;
      options: TTextWriterWriteObjectOptions);
    class procedure JL(var context: TJsonParserContext; data: pointer);
  public
    /// factory of one class implementing a ISerializable interface
    // - this abstract method must be overriden
    constructor Create(options: PDocVariantOptions); reintroduce; virtual; abstract;
    /// raw serialization of this instance into a JSON writer
    // - this abstract method must be overriden
    procedure ToJson(W: TJsonWriter;
      options: TTextWriterWriteObjectOptions); overload; virtual; abstract;
    /// raw unserialization of a JSON content into this instance
    // - this abstract method must be overriden
    procedure FromJson(var context: TJsonParserContext); virtual; abstract;
  public
    /// register this class to implement a given ISerializer sub-interface
    class function RegisterToRtti(InterfaceInfo: PRttiInfo): TRttiJson;
    /// return the associated ISerializer sub-interface TGuid
    // - as registered by RegisterToRtti() class method
    class function Guid: PGuid;
    /// create a new instance as the associated ISerializer sub-interface
    // - as registered by RegisterToRtti() class method
    class procedure NewInterface(out Obj);
    /// serialize this instance into a JSON array/object specific format
    function ToJson(format: TTextWriterJsonFormat;
      options: TTextWriterWriteObjectOptions): RawUtf8; overload; virtual;
    /// convert this instance into JSON array/object as RTL string
    function ToString(format: TTextWriterJsonFormat;
      options: TTextWriterWriteObjectOptions): string; reintroduce; virtual;
    /// unserialize/serialize this instance from/into a JSON array/object
    // - use ToString if you want the result as RTL string
    property Json: RawUtf8
      read GetJson write SetJson;
  end;
  {$M-}
  /// meta-class of the TInterfacedSerializable type
  TInterfacedSerializableClass = class of TInterfacedSerializable;
  /// points to a TInterfacedSerializable class instance
  PInterfacedSerializable = ^TInterfacedSerializable;

  /// abstract ISerializable class parent with auto-create published fields
  // - you should inherit this class, associated with an interface inheriting
  // from ISerializable (and propably with a method returning self to access the
  // properties), then call once the RegisterToRtti() class function
  // - could be used e.g. to implement a DDD/KDD Aggregate object with both
  // ref-counted data and methods, ready to be serialized over SOA
  TInterfacedSerializableAutoCreateFields = class(TInterfacedSerializable)
  protected
    fRttiJson: TRttiJson;
  public
    /// instantiate all nested  class or T*ObjArray published properties
    constructor Create(options: PDocVariantOptions = nil); override;
    /// finalize the instance, and release its published properties
    destructor Destroy; override;
    /// raw JSON serialization of the published properties of this instance
    procedure ToJson(W: TJsonWriter; options: TTextWriterWriteObjectOptions); override;
    /// raw JSON unserialization into the published properties of this instance
    procedure FromJson(var context: TJsonParserContext); override;
    /// low-level access to the RTTI information associated with this class
    property RttiJson: TRttiJson
      read fRttiJson;
  end;

  /// abstract TCollectionItem class, which will instantiate all its nested class
  // published properties, then release them (and any T*ObjArray) when freed
  // - could be used for gathering of TCollectionItem properties, e.g. for
  // Domain objects in DDD, especially for list of value objects
  // - consider using T*ObjArray dynamic array published properties in your
  // value types instead of TCollection storage: T*ObjArray have a lower overhead
  // and are easier to work with, once Rtti.RegisterObjArray is called on Delphi
  // 7-2009 to register the T*ObjArray type (not needed on FPC and Delphi 2010+)
  // - note that non published (e.g. public) properties won't be instantiated,
  // serialized, nor released - but may contain weak references to other classes
  // - please take care that you will not create any endless recursion: you should
  // ensure that at one level, nested published properties won't have any class
  // instance refering to its owner (there is no weak reference - remember!)
  // - since the destructor will release all nested properties, you should
  // never store a reference to any of those nested instances if this owner
  // may be freed before
  TCollectionItemAutoCreateFields = class(TCollectionItem)
  public
    /// this overriden constructor will instantiate all its nested
    // class or T*ObjArray published properties
    constructor Create(Collection: TCollection); override;
    /// finalize the instance, and release its published properties
    destructor Destroy; override;
  end;

  /// customize TSynJsonFileSettings process
  // - fsoDisableSaveIfNeeded will disable SaveIfNeeded method process
  // - fsoReadIni will disable JSON loading, and expect INI file format
  // - fsoWriteIni will force SaveIfNeeded to use the INI layout
  TSynJsonFileSettingsOption = (
    fsoDisableSaveIfNeeded,
    fsoReadIni,
    fsoWriteIni);
  TSynJsonFileSettingsOptions = set of TSynJsonFileSettingsOption;

  /// abstract parent class able to store settings as JSON file
  // - would fallback and try to read as INI file if no valid JSON is found
  TSynJsonFileSettings = class(TSynAutoCreateFields)
  protected
    fInitialJsonContent, fSectionName: RawUtf8;
    fFileName: TFileName;
    fLoadedAsIni: boolean;
    fSettingsOptions: TSynJsonFileSettingsOptions;
    // could be overriden to validate the content coherency and/or clean fields
    function AfterLoad: boolean; virtual;
  public
    /// read existing settings from a JSON content
    // - if the input is no JSON object, then a .INI structure is tried
    function LoadFromJson(const aJson: RawUtf8;
      const aSectionName: RawUtf8 = 'Main'): boolean;
    /// read existing settings from a JSON or INI file file
    function LoadFromFile(const aFileName: TFileName;
      const aSectionName: RawUtf8 = 'Main'): boolean; virtual;
    /// just a wrapper around ExtractFilePath(FileName);
    function FolderName: TFileName;
    /// persist the settings as a JSON file, named from LoadFromFile() parameter
    // - will use the INI format if it was used at loading, or fsoWriteIni is set
    procedure SaveIfNeeded; virtual;
    /// optional persistence file name, as set by LoadFromFile()
    property FileName: TFileName
      read fFileName write fFileName;
    /// allow to customize the storing process
    property SettingsOptions: TSynJsonFileSettingsOptions
      read fSettingsOptions write fSettingsOptions;
  end;
  /// meta-class definition of TSynJsonFileSettings
  TSynJsonFileSettingsClass = class of TSynJsonFileSettings;


implementation

uses
  mormot.core.variants;


{ ********** Low-Level JSON Processing Functions }

function NeedsJsonEscape(P: PUtf8Char; PLen: integer): boolean;
var
  tab: PByteArray;
begin
  result := true;
  tab := @JSON_ESCAPE;
  if PLen > 0 then
    repeat
      if tab[ord(P^)] <> JSON_ESCAPE_NONE then
        exit;
      inc(P);
      dec(PLen);
    until PLen = 0;
  result := false;
end;

function NeedsJsonEscape(const Text: RawUtf8): boolean;
begin
  result := NeedsJsonEscape(pointer(Text), length(Text));
end;

function NeedsJsonEscape(P: PUtf8Char): boolean;
var
  tab: PByteArray;
  esc: byte;
begin
  result := false;
  if P = nil then
    exit;
  tab := @JSON_ESCAPE;
  repeat
    esc := tab[ord(P^)];
    if esc = JSON_ESCAPE_NONE then
      inc(P)
    else if esc = JSON_ESCAPE_ENDINGZERO then
      exit
    else
      break;
  until false;
  result := true;
end;

function JsonUnicodeEscapeToUtf8(var D: PUtf8Char;  P: PUtf8Char): PUtf8Char;
var
  c, s: cardinal;
begin
  // P^ points at 'u1234' just after \u0123
  c := HexToWideChar(P + 1);
  if c <= $7f then
    if c >= 32 then
      D^ := AnsiChar(c)
    else if c = 0 then
      D^ := '?' // \u0000 is an invalid value (at least in our framework)
    else
    begin
      PInt64(D)^ := PInt64(P - 1)^; // control chars should always be escaped
      inc(D, 5);
    end
  else if c < $7ff then
  begin
    D[0] := AnsiChar($C0 or (c shr 6));
    D[1] := AnsiChar($80 or (c and $3F));
    inc(D);
  end
  else if (c >= UTF16_HISURROGATE_MIN) and  // decode from two UTF-16 surrogates
          (c <= UTF16_LOSURROGATE_MAX) then
    if PWord(P + 5)^ = ord('\') + ord('u') shl 8 then
    begin
      s := HexToWideChar(P + 7);
      if s = 0 then
        D^ := '?' // invalid surrogate
      else
      begin
        case c of // inlined Utf16CharToUtf8()
          UTF16_HISURROGATE_MIN..UTF16_HISURROGATE_MAX:
            c := ((c - UTF16_SURROGATE_OFFSET) shl 10) or
                 (s xor UTF16_LOSURROGATE_MIN);
          UTF16_LOSURROGATE_MIN..UTF16_LOSURROGATE_MAX:
            c := ((s - UTF16_SURROGATE_OFFSET) shl 10) or
                 (c xor UTF16_LOSURROGATE_MIN);
        end;
        inc(D, Ucs4ToUtf8(c, D));
        result := P + 11;
        exit;
      end;
    end
    else
      D^ := '?' // the first \u#### expects a following \u#### surrogate
  else
  begin
    D[0] := AnsiChar($E0 or (c shr 12));
    D[1] := AnsiChar($80 or ((c shr 6) and $3F));
    D[2] := AnsiChar($80 or (c and $3F));
    inc(D,2);
  end;
  inc(D);
  result := P + 5;
end;

procedure JsonDoUniEscape(const s: RawUtf8; var result: RawUtf8; esc: boolean);
var
  tmp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(tmp) do
    try
      if esc then
        AddNoJsonEscapeForcedUnicode(pointer(s), length(s))
      else
        AddNoJsonEscapeForcedNoUnicode(pointer(s), length(s));
      SetText(result);
    finally
      Free;
    end;
end;

function JsonUnicodeEscape(const s: RawUtf8): RawUtf8;
begin
  JsonDoUniEscape(s, result, true);
end;

function JsonUnicodeUnEscape(const s: RawUtf8): RawUtf8;
begin
  JsonDoUniEscape(s, result, false);
end;

procedure Utf16ToJsonUnicodeEscape(var B: PUtf8Char; c: PtrUInt; tab: PByteToWord);
var
  P: PUtf8Char;
begin
  P := B;
  PWord(P + 1)^ := ord('\') + ord('u') shl 8;
  PWord(P + 3)^ := tab[c shr 8];
  PWord(P + 5)^ := tab[c and $ff];
  inc(B, 6);
end;

function IsString(P: PUtf8Char): boolean;  // test if P^ is a "string" value
begin
  if P = nil then
  begin
    result := false;
    exit;
  end;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  if (P[0] in ['0'..'9']) or // is first char numeric?
     ((P[0] in ['-', '+']) and
      (P[1] in ['0'..'9'])) then
  begin
    // check if P^ is a true numerical value
    repeat
      inc(P);
    until not (P^ in ['0'..'9']); // check digits
    if P^ = '.' then
      repeat
        inc(P);
      until not (P^ in ['0'..'9']); // check fractional digits
    if ((P^ = 'e') or
        (P^ = 'E')) and
       (P[1] in ['0'..'9', '+', '-']) then
    begin
      inc(P);
      if P^ = '+' then
        inc(P)
      else if P^ = '-' then
        inc(P);
      while (P^ >= '0') and
            (P^ <= '9') do
        inc(P);
    end;
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    result := (P^ <> #0);
    exit;
  end
  else
    result := true; // don't begin with a numerical value -> must be a string
end;

function IsStringJson(P: PUtf8Char): boolean;  // test if P^ is a "string" value
var
  c4: integer;
  c: AnsiChar;
  tab: PJsonCharSet;
begin
  if P = nil then
  begin
    result := false;
    exit;
  end;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  tab := @JSON_CHARS;
  c4 := PInteger(P)^;
  if (((c4 = NULL_LOW) or
       (c4 = TRUE_LOW)) and
      (jcEndOfJsonValueField in tab[P[4]])) or
     ((c4 = FALSE_LOW) and
      (P[4] = 'e') and
      (jcEndOfJsonValueField in tab[P[5]])) then
  begin
    result := false; // constants are no string
    exit;
  end;
  c := P^;
  if c = '-' then
  begin
    inc(P);
    c := P^;
  end;
  if ((c >= '1') and (c <= '9')) or // is first char numeric?
     ((c = '0') and ((P[1] < '0') or (P[1] > '9'))) then // '012' not JSON
  begin
    // check if c is a true numerical value
    repeat
      inc(P);
    until (P^ < '0') or
          (P^ > '9'); // check digits
    if P^ = '.' then
      repeat
        inc(P);
      until (P^ < '0') or
            (P^ > '9'); // check fractional digits
    if ((P^ = 'e') or
        (P^ = 'E')) and
       (jcDigitFirstChar in tab[P[1]]) then
    begin
      inc(P);
      c := P^;
      if c = '+' then
        inc(P)
      else if c = '-' then
        inc(P);
      while (P^ >= '0') and
            (P^ <= '9') do
        inc(P);
    end;
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    result := (P^ <> #0);
    exit;
  end
  else
    result := true; // don't begin with a numerical value -> must be a string
end;

type
  TJsonGotoEndParserState = (
    stObjectName,
    stObjectValue,
    stValue);

  /// state machine for fast (900MB/s) parsing of (extended) JSON input
  {$ifdef USERECORDWITHMETHODS}
  TJsonGotoEndParser = record
  {$else}
  TJsonGotoEndParser = object
  {$endif USERECORDWITHMETHODS}
  public
    {$ifdef CPUX86}
    JsonSet: PJsonCharSet; // not enough registers in i386 mode
    {$endif CPUX86}
    State: TJsonGotoEndParserState;
    ExpectStandard: boolean;
    StackCount: integer;
    JsonFirst: PJsonTokens;
    Max: PUtf8Char; // checking Max after each comma is good enough
    RootCount: integer;
    // 500 nested documents seem enough in practice (SQlite3 uses 1000)
    Stack: array[0..500] of TJsonGotoEndParserState;
    procedure Init(Strict: boolean; PMax: PUtf8Char);
      {$ifdef HASINLINE} inline; {$endif}
    procedure InitCount(Strict: boolean; PMax: PUtf8Char;
      First: TJsonGotoEndParserState);
    // reusable method able to jump over any JSON value (up to Max)
    function GotoEnd(P: PUtf8Char): PUtf8Char; overload;
    function GotoEnd(P: PUtf8Char; var EndOfObject: AnsiChar): PUtf8Char; overload;
      {$ifdef HASINLINE} inline; {$endif}
 end;

procedure TJsonGotoEndParser.Init(Strict: boolean; PMax: PUtf8Char);
begin
  {$ifdef CPUX86}
  JsonSet := @JSON_CHARS;
  {$endif CPUX86}
  State := stValue;
  ExpectStandard := Strict;
  StackCount := 0;
  JsonFirst := @JSON_TOKENS;
  Max := PMax;
end; // RootCount is not initialized by default unless InitCount() is called

procedure TJsonGotoEndParser.InitCount(Strict: boolean; PMax: PUtf8Char;
  First: TJsonGotoEndParserState);
begin
  Init(Strict, PMax);
  RootCount := 0;
  Stack[0] := stValue; // emulate parsing of the opening [ or {
  inc(StackCount);
  State := First;
end;

function TJsonGotoEndParser.GotoEnd(P: PUtf8Char): PUtf8Char;
var
  n: PtrInt;
  {$ifndef CPUX86}
  JsonSet: PJsonCharSet; // will use a register for this lookup table
  {$endif CPUX86}
label
  prop, stop, assign;
begin
  result := nil; // to notify unexpected end
  if P = nil then
    exit;
  {$ifndef CPUX86}
  JsonSet := @JSON_CHARS;
  {$endif CPUX86}
  repeat
    {$ifdef FPC}
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    {$else}
    if P^ in [#1..' '] then
      repeat
        inc(P)
      until not (P^ in [#1..' ']);
    {$endif FPC}
    case JsonFirst[P^] of // FPC and Delphi will use a jump table :)
      jtNone:
        exit;// unexpected character in JSON input
      jtDoubleQuote: // '"'
        begin
          repeat // inlined GotoEndOfJsonString2()
            inc(P);
            if not (jcJsonStringMarker in JsonSet[P^]) then // [#0, '"', '\']
              continue; // very fast parsing of most UTF-8 chars
            if P^ = '"' then
              break
            else if P^ = #0 then
              exit; // unexpected end of string/buffer
            inc(P); // P^ was '\' -> ignore \# ou \u0123
            if P^ = #0 then
              exit; // buffer overflow detected as \#0
          until false;
          inc(P);
          if (StackCount <> 0) or
             (State = stObjectName) then
            continue;
          break;
        end;
      jtFirstDigit: // '-', '0'..'9'
        begin
          if (State = stObjectName) and
             ExpectStandard then
            exit;
          // '0123' excluded by JSON, but not here
          repeat
            inc(P);
          until not (jcDigitFloatChar in JsonSet[P^]);
          // not ['-', '+', '0'..'9', '.', 'E', 'e']
          if (StackCount <> 0) or
             (State = stObjectName) then
            continue;
          break;
        end;
      jtNullFirstChar: // 'n'
        if (PInteger(P)^ = NULL_LOW) and
           (jcEndOfJsonValueField in JsonSet[P[4]]) then
          inc(P, 3)
        else
          goto prop;
      jtTrueFirstChar: // 't'
        if (PInteger(P)^ = TRUE_LOW) and
           (jcEndOfJsonValueField in JsonSet[P[4]]) then
          inc(P, 3)
        else
          goto prop;
      jtFalseFirstChar: // 'f'
        if (PInteger(P + 1)^ = FALSE_LOW2) and
           (jcEndOfJsonValueField in JsonSet[P[5]]) then
          inc(P, 4)
        else
          goto prop;
      jtObjectStart: // {
        begin
          n := StackCount;
          if (State = stObjectName) or
             (n > high(Stack)) then
            exit; // too many nested documents
          Stack[n] := State;
          inc(StackCount);
          State := stObjectName;
          inc(P);
          continue;
        end;
      jtArrayStart: // [
        begin
          n := StackCount;
          if (State = stObjectName) or
             (n > high(Stack)) then
            exit; // too many nested documents
          Stack[n] := State;
          inc(StackCount);
          State := stValue;
          inc(P);
          continue;
        end;
      jtObjectStop: // }
        begin
          if State = stValue then
            exit;
stop:     n := StackCount;
          if n = 0 then
            exit; // invalid input
          dec(n);
          inc(RootCount, ord(n = 0));
          StackCount := n;
          State := Stack[n];
        end;
      jtArrayStop: // ]
        if State <> stValue then
          exit
        else
          goto stop;
      jtAssign: // :
        begin
assign:   if State <> stObjectName then
            exit;
          State := stObjectValue;
          inc(P);
          continue;
        end;
      jtComma: // ,
        begin
          if State = stObjectName then
            exit;
          dec(State, ord(State = stObjectValue)); // branchless update
          inc(P);
          inc(RootCount, ord(StackCount = 1));
          if (Max = nil) or // checking Max after each comma is good enough
             (P < Max) then
            continue;
          // reached end of allowed - but valid - input
          if RootCount = 0 then
            dec(RootCount) // first item may be huge -> at least -1
          else
            RootCount := -RootCount;
          exit;
        end;
      jtSingleQuote: // '''' as single-quoted identifier or value
        if ExpectStandard then
          exit
        else
          repeat
            inc(P);
            if P^ <= ' ' then
              exit;
          until P^ = '''';
      jtEqual: // =
        if ExpectStandard then
          exit
        else
          goto assign;
      jtIdentifierFirstChar: // ['_', 'a'..'z', 'A'..'Z', '$']
        begin
prop:     if ExpectStandard then
            exit;
          repeat
            repeat
              inc(P);
            until not (jcJsonIdentifier in JsonSet[P^]);
            // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '.', '[', ']']
            while (P^ <= ' ') and
                  (P^ <> #0) do
              inc(P);
          until not (jcJsonIdentifierFirstChar in JsonSet[P^]); // new date(...
          while (P^ <= ' ') and
                (P^ <> #0) do
            inc(P);
          if P^ = '(' then
          begin
            // handle e.g. "born":isodate("1969-12-31")
            repeat
              inc(P);
            until (P^ > ' ') or
                  (P^ = #0);
            if P^ = '"' then
            begin
              repeat
                inc(P);
              until jcJsonStringMarker in JsonSet[P^]; // [#0, '"', '\']
              if P^ <> '"' then
                exit;
              inc(P);
            end;
            while (P^ <> ')') and
                  (P^ <> #0) do
              inc(P);
            if P^ <> #0 then
              inc(P);
          end
          else if State <> stObjectName then
            exit; // identifier values are functions like isodate() objectid()
          continue;
        end;
      jtSlash: // '/' extended /regex/i or /*comment*/ or //comment
        begin
          if ExpectStandard then
            exit;
          inc(P);
          if P^ = #0 then
            exit
          else if P^ = '*' then // ignore /* comment */
          begin
            repeat
              inc(P);
              if P^ = #0 then
                exit;
            until PWord(P)^ = ord('*') + ord('/') shl 8;
            inc(P, 2);
            continue;
          end
          else if P^ = '/' then // ignore // comment
          begin
            P := GotoNextLine(P + 1);
            if P = nil then
              exit;
            continue;
          end
          else
          begin
            repeat // extended /regex/i syntax
              inc(P);
              if P^ = #0 then
                exit;
            until P^ = '/';
            while not (jcEndOfJsonFieldNotName in JsonSet[P[1]]) do
              inc(P);
          end;
        end;
      jtEndOfBuffer: // #0
        if StackCount <> 0 then
          exit // unclosed array or object
        else
          break; // return #0
    else
      exit; // paranoid (every and each TJsonToken should be handled above)
    end;
    // if we are here we know this was an identifier or value
    inc(P);
    if (StackCount = 0) and
       (State <> stObjectName) then
      break;
  until false;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  result := P; // points to the next meaningful char
end;

function TJsonGotoEndParser.GotoEnd(P: PUtf8Char; var EndOfObject: AnsiChar): PUtf8Char;
var
  c: AnsiChar;
begin
  result := GotoEnd(P);
  if result = nil then
    exit;
  c := result^; // return last jcEndOfJsonFieldOr0
  EndOfObject := c;
  if c <> #0 then
    inc(result);
end;

function IsValidJson(const s: RawUtf8; strict: boolean): boolean;
begin
  result := IsValidJson(pointer(s), length(s), strict);
end;

function IsValidJson(P: PUtf8Char; len: PtrInt; strict: boolean): boolean;
var
  B: PUtf8Char;
  parser: TJsonGotoEndParser;
begin
  result := false;
  if (P = nil) or
     (len <= 0) then
    exit;
  B := P;
  {%H-}parser.Init(strict, P + len);
  P := parser.GotoEnd(P);
  result := (P <> nil) and
            (P - B = len);
end;

function GetFirstJsonToken(P: PUtf8Char): TJsonToken;
begin
  if P <> nil then
    result := JSON_TOKENS[GotoNextNotSpace(P)^]
  else
    result := jtNone;
end;

function GetNextJsonToken(var P: PUtf8Char; strict: boolean; DocCount: PInteger): TJsonToken;
var
  parser: TJsonGotoEndParser;
begin
  result := jtNone;
  if DocCount <> nil then
    DocCount^ := 0;
  if P = nil then
    exit;
  P := GotoNextNotSpace(P);
  result := JSON_TOKENS[P^];
  if result in [jtNone, jtEndOfBuffer, jtAssign, jtEqual, jtComma] then
  begin
    P := nil;
    result := jtNone;
    exit;
  end;
  {%H-}parser.Init(strict, nil);
  parser.RootCount := 0;
  P := parser.GotoEnd(P);
  if P = nil then
    result := jtNone
  else if DocCount <> nil then
    DocCount^ := parser.RootCount;
end;

function IsValidJsonBuffer(P: PUtf8Char; strict: boolean): boolean;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init(strict, nil);
  result := parser.GotoEnd(P) <> nil;
end;

procedure IgnoreComma(var P: PUtf8Char);
begin
  if P <> nil then
  begin
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    if P^ = ',' then
      inc(P);
  end;
end;

function JsonPropNameValid(P: PUtf8Char): boolean;
var
  tab: PJsonCharSet;
begin
  tab := @JSON_CHARS;
  if (P <> nil) and
     (jcJsonIdentifierFirstChar in tab[P^]) then
  begin
    // ['_', '0'..'9', 'a'..'z', 'A'..'Z', '$']
    repeat
      inc(P);
    until not (jcJsonIdentifier in tab[P^]);
    // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '.', '[', ']']
    result := P^ = #0;
  end
  else
    result := false;
end;

{$ifndef PUREMORMOT2}
function GetJsonField(P: PUtf8Char; out PDest: PUtf8Char; WasString: PBoolean;
  EndOfObject: PUtf8Char; Len: PInteger): PUtf8Char;
var
  info: TGetJsonField;
begin
  info.Json := P;
  info.GetJsonField;
  PDest := info.Json;
  if WasString <> nil then
    WasString^ := info.WasString;
  if EndOfObject <> nil then
    EndOfObject^ := info.EndOfObject;
  if Len <> nil then
    Len^ := info.ValueLen;
  result := info.Value;
end;

function GetJsonFieldOrObjectOrArray(var Json: PUtf8Char; WasString: PBoolean;
  EndOfObject: PUtf8Char; HandleValuesAsObjectOrArray, NormalizeBoolean: boolean;
  Len: PInteger): PUtf8Char;
var
  info: TGetJsonField;
begin
  info.Json := Json;
  info.GetJsonFieldOrObjectOrArray(HandleValuesAsObjectOrArray, NormalizeBoolean);
  Json := info.Json;
  if WasString <> nil then
    WasString^ := info.WasString;
  if EndOfObject <> nil then
    EndOfObject^ := info.EndOfObject;
  if Len <> nil then
    Len^ := info.ValueLen;
  result := info.Value;
end;
{$endif PUREMORMOT2}


{ TGetJsonField }

procedure TGetJsonField.GetJsonValue(var Text: RawUtf8);
begin
  GetJsonField;
  FastSetString(Text, Value, ValueLen);
end;

function TGetJsonField.GetJsonInt64: Int64;
begin
  GetJsonField;
  result := GetInt64(Value);
end;

procedure TGetJsonField.GetJsonField;
var
  P, D: PUtf8Char;
  c4, surrogate, extra: PtrUInt;
  c: AnsiChar;
  {$ifdef CPUX86NOTPIC}
  tab: TJsonCharSet absolute JSON_CHARS; // not enough registers
  {$else}
  tab: PJsonCharSet;
  {$endif CPUX86NOTPIC}
begin
  // see http://www.ietf.org/rfc/rfc4627.txt
  P := Json;
  Json := nil; // Json=nil indicates error or unexpected end (#0)
  Value := nil;
  ValueLen := 0; // ensure returns ValueLen=0 on invalid input (Json=nil)
  WasString := false; // not a string by default
  if P = nil then
    exit;
  while P^ <= ' ' do
  begin
    if P^ = #0 then
      exit;
    inc(P);
  end;
  {$ifndef CPUX86NOTPIC}
  tab := @JSON_CHARS;
  {$endif CPUX86NOTPIC}
  case JSON_TOKENS[P^] of
    jtFirstDigit: // '-', '0'..'9'
      begin
        // numerical value
        Value := P;
        if P^ = '0' then
          if (P[1] >= '0') and
             (P[1] <= '9') then
            // 0123 excluded by JSON!
            exit;
        repeat // loop all '-', '+', '0'..'9', '.', 'E', 'e'
          inc(P);
        until not (jcDigitFloatChar in tab[P^]);
        if P^ = #0 then
          exit; // a JSON number value should be followed by , } or ]
        ValueLen := P - Value;
        if (P^ <= ' ') and
           (P^ <> #0) then
        begin
          P^ := #0; // force numerical field with no trailing ' '
          inc(P);
        end;
      end;
    jtDoubleQuote: // '"'
      begin
        // " -> unescape P^ into D^
        inc(P);
        Value := P; // points to the unescaped JSON string
        WasString := true;
        while not (jcJsonStringMarker in tab[P^]) do
          // not [#0, '"', '\']
          inc(P); // very fast parsing of most UTF-8 chars within "string"
        D := P;
        if P^ <> '"' then
        repeat
          // escape needed -> in-place unescape from P^ into D^
          c := P^;
          if not (jcJsonStringMarker in tab[c]) then
          begin
            inc(P);
            D^ := c;
            inc(D);
            continue; // very fast parsing of most UTF-8 chars within "string"
          end;
          // P^ is either #0, '"' or '\'
          if c = '"' then
            // end of string
            break;
          if c = #0 then
            // premature ending (leaving Json=nil)
            exit;
          // unescape JSON text: process char after \
          inc(P); // P^ was '\' here
          c := JSON_UNESCAPE[P^];
          if c > JSON_UNESCAPE_UTF16 then
          begin
            inc(P);
            D^ := c;
            inc(D);
            continue; // direct un-escape of most \x values
          end
          else if c = JSON_UNESCAPE_UNEXPECTED then
            exit; // avoid \#0 potential buffer overflow issue or control char
          // JSON_UNESCAPE_UTF16: decode '\u0123' UTF-16 into UTF-8
          // (inlined JsonUnicodeEscapeToUtf8() to optimize GetJsonField)
          c4 := (ConvertHexToBin[ord(P[1])] shl 12) or
                (ConvertHexToBin[ord(P[2])] shl 8) or
                (ConvertHexToBin[ord(P[3])] shl 4) or
                 ConvertHexToBin[ord(P[4])]; // optimistic conversion (no check)
          inc(P, 5);
          case c4 of
            0: // \u0000 is an invalid value (at least in our framework)
              begin
                D^ := '?';
                inc(D);
              end;
            1..$7f:
              begin
                D^ := AnsiChar(c4);
                inc(D);
              end;
            $80..$7ff:
              begin
                D[0] := AnsiChar($C0 or (c4 shr 6));
                D[1] := AnsiChar($80 or (c4 and $3F));
                inc(D, 2);
              end;
            UTF16_HISURROGATE_MIN..UTF16_LOSURROGATE_MAX:
              if PWord(P)^ = ord('\') + ord('u') shl 8 then
              begin
                inc(P);
                surrogate := (ConvertHexToBin[ord(P[1])] shl 12) or
                             (ConvertHexToBin[ord(P[2])] shl 8) or
                             (ConvertHexToBin[ord(P[3])] shl 4) or
                              ConvertHexToBin[ord(P[4])];
                case c4 of // inlined Utf16CharToUtf8()
                  UTF16_HISURROGATE_MIN..UTF16_HISURROGATE_MAX:
                    c4 := ((c4 - UTF16_SURROGATE_OFFSET) shl 10) or
                          (surrogate xor UTF16_LOSURROGATE_MIN);
                  UTF16_LOSURROGATE_MIN..UTF16_LOSURROGATE_MAX:
                    c4 := ((surrogate - UTF16_SURROGATE_OFFSET) shl 10) or
                          (c4 xor UTF16_LOSURROGATE_MIN);
                end;
                if c4 <= $7ff then
                  c := #2
                else if c4 <= $ffff then
                  c := #3
                else if c4 <= $1FFFFF then
                  c := #4
                else if c4 <= $3FFFFFF then
                  c := #5
                else
                  c := #6;
                extra := ord(c) - 1;
                repeat
                  D[extra] := AnsiChar((c4 and $3f) or $80);
                  c4 := c4 shr 6;
                  dec(extra);
                until extra = 0;
                D^ := AnsiChar(byte(c4) or UTF8_TABLE.FirstByte[ord(c)]);
                inc(D, ord(c));
                inc(P, 5);
              end
              else
              begin
                // unexpected surrogate without its pair
                D^ := '?';
                inc(D);
              end;
          else
            begin
              D[0] := AnsiChar($E0 or (c4 shr 12));
              D[1] := AnsiChar($80 or ((c4 shr 6) and $3F));
              D[2] := AnsiChar($80 or (c4 and $3F));
              inc(D, 3);
            end;
          end;
        until false;
        // here P^='"'
        inc(P);
        D^ := #0; // make zero-terminated
        ValueLen := D - Value;
      end;
    jtSingleQuote: // extended/non-standard 'text' single quoted content
      begin
        inc(P);
        Value := P; // points to the unquoted string
        WasString := true;
        D := P;
        repeat
          c := P^;
          if c = #0 then
            exit
          else if c = '''' then
            if P[1] = '''' then
              inc(P) // unquote double quotes
            else
              break;
          D^ := c;
          inc(D);
          inc(P);
        until false;
        inc(P);
        D^ := #0; // make zero-terminated
        ValueLen := D - Value;
      end;
    jtNullFirstChar: // 'n'
      if (PInteger(P)^ = NULL_LOW) and
         (jcEndOfJsonValueField in tab[P[4]]) then
         // [#0, #9, #10, #13, ' ',  ',', '}', ']']
        // null -> returns nil and WasString=false
        inc(P, 4)
      else
        exit;
    jtFalseFirstChar: // 'f'
      if (PInteger(P + 1)^ = FALSE_LOW2) and
         (jcEndOfJsonValueField in tab[P[5]]) then
         // [#0, #9, #10, #13, ' ',  ',', '}', ']']
      begin
        // false -> returns 'false' and WasString=false
        Value := P;
        ValueLen := 5;
        inc(P, 5);
      end
      else
        exit;
    jtTrueFirstChar: // 't'
      if (PInteger(P)^ = TRUE_LOW) and
         (jcEndOfJsonValueField in tab[P[4]]) then
         // [#0, #9, #10, #13, ' ',  ',', '}', ']']
      begin
        // true -> returns 'true' and WasString=false
        Value := P;
        ValueLen := 4;
        inc(P, 4);
      end
      else
        exit;
  else
    // leave Json=nil on error (e.g. if a {...} or [...] was supplied)
    exit;
  end;
  while not (jcEndOfJsonFieldOr0 in tab[P^]) do
    // loop until #0 , ] } : delimiter
    inc(P);
  EndOfObject := P^;
  // ensure JSON value is zero-terminated, and continue after it
  if P^ <> #0 then
  begin
    P^ := #0;
    Json := P + 1;
  end
  else
    Json := P;
end;

function TryGotoEndOfComment(P: PUtf8Char): PUtf8Char;
begin
  repeat
    result := P; // return input P^ = '/' if no comment was found
    inc(P);
    if P^ = '*' then // ignore /* comment */
    begin
      repeat
        inc(P);
        if P^ = #0 then
          exit;
      until PWord(P)^ = ord('*') + ord('/') shl 8;
      result := GotoNextNotSpace(P + 2);
    end
    else if P^ = '/' then // ignore // comment
    begin
      P := GotoNextLine(P + 1);
      if P = nil then
        exit;
      result := GotoNextNotSpace(P);
    end
    else
      exit;
  until P^ <> '/'; // there may be other subsequent comments ;)
end;

procedure TGetJsonField.GetJsonFieldOrObjectOrArray(
  HandleValuesAsObjectOrArray, NormalizeBoolean: boolean);
var
  P: PUtf8Char;
  parser: TJsonGotoEndParser;
  c: integer;
begin
  P := Json;
  Value := nil;
  ValueLen := 0;
  if P = nil then
    exit;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  if P^ = '/' then
    P := TryGotoEndOfComment(P);
  if HandleValuesAsObjectOrArray and
     (P^ in ['{', '[']) then
  begin
    WasString := false;
    Value := P;
    {%H-}parser.Init({strict=}false, nil);
    P := parser.GotoEnd(P);
    if P = nil then
      Value := nil
    else
    begin
      ValueLen := P - Value;
      while (P^ <= ' ') and
            (P^ <> #0) do
        inc(P);
      EndOfObject := P^;
      if P^ <> #0 then
      begin
        P^ := #0; // make zero-terminated as GetJsonField()
        inc(P);
      end;
    end;
    Json := P;
  end
  else
  begin
    Json := P;
    GetJsonField;
    if not WasString and
       NormalizeBoolean and
       (Value <> nil) then
    begin
      c := PInteger(Value)^;
      if c = TRUE_LOW then
        Value := pointer(SmallUInt32Utf8[1]) // normalize true -> 1
      else if c = FALSE_LOW then
        Value := pointer(SmallUInt32Utf8[0]) // normalize false -> 0
      else
        exit;
      ValueLen := 1; // result = '0' or '1'
    end;
  end;
end;

function GotoEndOfJsonString2(P: PUtf8Char; tab: PJsonCharSet): PUtf8Char;
  {$ifdef HASINLINE} inline; {$endif}
begin
  // P[-1]='"' at function call
  repeat
    if not (jcJsonStringMarker in tab[P^]) then
    begin
      inc(P);   // not [#0, '"', '\']
      continue; // very fast parsing of most UTF-8 chars
    end;
    if (P^ = '"') or
       (P^ = #0) or
       (P[1] = #0) then
      // end of string/buffer, or buffer overflow detected as \#0
      break;
    inc(P, 2); // P^ was '\' -> ignore \# ou \u0123
  until false;
  result := P;
  // P^='"' at function return (if input was correct)
end;

function GotoEndOfJsonString(P: PUtf8Char): PUtf8Char;
begin
  // P^='"' at function call and at successful function return
  result := GotoEndOfJsonString2(P + 1, @JSON_CHARS);
end;

function GotoEndJsonItemString(P: PUtf8Char): PUtf8Char;
var
  tab: PJsonCharSet;
begin
  // see TOrmTableJson.ParseAndConvert and TDocVariantData.InitArrayFromResults
  if P <> nil then
    repeat
      if P^ = '"' then
      begin
        inc(P);
        tab := @JSON_CHARS;
        repeat // inlined GotoEndOfJsonString2()
          if not (jcJsonStringMarker in tab[P^]) then
          begin
            inc(P);   // not [#0, '"', '\']
            continue; // very fast parsing of most UTF-8 chars
          end;
          if P^ = '"' then
          begin
            repeat
              inc(P);
            until not (P^ in [#1..' ']);
            result := P;
            exit;
          end
          else if (P^ = #0) or
                  (P[1] = #0) then
            // end of string/buffer, or buffer overflow detected as \#0
            break;
          inc(P, 2); // P^ was '\' -> ignore \# ou \u0123
        until false;
        break;
      end
      else if P^ <= ' ' then
      begin
        if P^ = #0 then
          break;
        inc(P);
        continue;
      end;
      break;
    until false;
  result := nil;
end;

function GetJsonPropName(var Json: PUtf8Char; Len: PInteger;
  NoJsonUnescape: boolean): PUtf8Char;
var
  P, Name: PUtf8Char;
  tab: PJsonCharSet;
  info: TGetJsonField;
begin
  // should match GotoNextJsonObjectOrArray() and JsonPropNameValid()
  result := nil; // returns nil on invalid input
  P := Json;
  if P = nil then
    exit;
  while P^ <= ' ' do
  begin
    if P^ = #0 then
    begin
      Json := nil; // reached early end of input
      exit;
    end;
    inc(P);
  end;
  if P^ = '/' then
    P := TryGotoEndOfComment(P);
  Name := P + 1;
  tab := @JSON_CHARS;
  if P^ = '"' then
  begin
    // handle very efficiently the most common case of unescaped double quotes
    repeat
      inc(P);
    until jcJsonStringMarker in tab[P^]; // [#0, '"', '\']
    if P^ <> '"' then
      // we need to handle a complex property name (seldom encoutered)
      if P^ = #0 then
        exit
      else if NoJsonUnescape then
        P := GotoEndOfJsonString2(P, tab)
      else
      begin // should be unescaped
        info.Json := Name - 1;
        info.GetJsonField;
        if (info.Value <> nil) and
           info.WasString and
           (info.EndOfObject = ':') then
        begin
          result := info.Value;
          if Len <> nil then
            Len^ := info.ValueLen;
        end;
        Json := info.Json;
        exit;
      end;
  end
  else if P^ = '''' then
    // single quotes won't handle nested quote character
    repeat
      inc(P);
      if P^ < ' ' then
        exit;
    until P^ = ''''
  else
  begin
    // e.g. '{age:{$gt:18}}'
    if not (jcJsonIdentifierFirstChar in tab[P^]) then
      exit; // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '$']
    repeat
      inc(P);
    until not (jcJsonIdentifier in tab[P^]);
    // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '.', '[', ']']
    if P^ = #0 then
      exit;
    dec(Name);
    if Len <> nil then
      Len^ := P - Name;
    info.EndOfObject := P^;
    P^ := #0; // Name should end with #0
    if not (info.EndOfObject in [':', '=']) then // relaxed {age=10} syntax
      repeat
        inc(P);
        if P^ = #0 then
          exit;
      until P^ in [':', '='];
    Json := P + 1;
    result := Name;
    exit;
  end;
  if Len <> nil then
    Len^ := P - Name;
  P^ := #0; // ensure Name is #0 terminated
  repeat
    inc(P);
    if P^ = #0 then
      exit;
  until P^ = ':';
  Json := P + 1;
  result := Name;
end;

procedure GetJsonPropNameShort(var P: PUtf8Char; out PropName: ShortString);
var
  Name: PAnsiChar;
  c: AnsiChar;
  tab: PJsonCharSet;
label
  ok;
begin
  // match GotoNextJsonObjectOrArray() and overloaded GetJsonPropName()
  PropName[0] := #0;
  if P = nil then
    exit;
  while P^ <= ' ' do
  begin
    if P^ = #0 then
    begin
      P := nil;
      exit;
    end;
    inc(P);
  end;
  Name := pointer(P);
  c := P^;
  if c = '/' then
  begin
    P := TryGotoEndOfComment(P);
    c := P^;
  end;
  if c = '"' then
  begin
    inc(Name);
    tab := @JSON_CHARS;
    repeat
      inc(P);
    until jcJsonStringMarker in tab[P^]; // end at [#0, '"', '\']
    if P^ <> '"' then
      exit;
ok: SetString(PropName, Name, P - Name); // note: won't unescape JSON strings
    repeat
      inc(P)
    until (P^ > ' ') or
          (P^ = #0);
    if P^ <> ':' then
    begin
      PropName[0] := #0;
      exit;
    end;
    inc(P);
  end
  else if c = '''' then
  begin
    // single quotes won't handle nested quote character
    inc(P);
    inc(Name);
    while P^ <> '''' do
      if P^ < ' ' then
        exit
      else
        inc(P);
    goto ok;
  end
  else
  begin
    // e.g. '{age:{$gt:18}}'
    tab := @JSON_CHARS;
    if not (jcJsonIdentifierFirstChar in tab[c]) then
      exit; // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '$']
    repeat
      inc(P);
    until not (jcJsonIdentifier in tab[P^]);
    // not ['_', '0'..'9', 'a'..'z', 'A'..'Z', '.', '[', ']']
    SetString(PropName, Name, P - Name);
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    if (P^ <> ':') and
       (P^ <> '=') then
    begin
      // allow both age:18 and age=18 pairs (very relaxed JSON syntax)
      PropName[0] := #0;
      exit;
    end;
    inc(P);
  end;
end;

function JsonRetrieveStringField(P: PUtf8Char; out Field: PUtf8Char;
  out FieldLen: integer; ExpectNameField: boolean): PUtf8Char;
var
  tab: PJsonCharSet;
begin
  result := nil;
  // retrieve string field
  if P = nil then
    exit;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  if P^ <> '"' then
    exit;
  inc(P);
  Field := P;
  tab := @JSON_CHARS;
  while not (jcJsonStringMarker in tab[P^]) do
    // not [#0, '"', '\']
    inc(P); // very fast parsing of most UTF-8 chars within "string"
  if P^ <> '"' then
    exit; // here P^ should be '"'
  FieldLen := P - Field;
  // check valid JSON delimiter
  repeat
    inc(P)
  until (P^ > ' ') or
        (P^ = #0);
  if ExpectNameField then
  begin
    if P^ <> ':' then
      exit; // invalid name field
  end
  else if not (P^ in ['}', ',']) then
    exit; // invalid value field
  result := P; // return either ':' for name field, or } , for value field
end;

function GlobalFindClass(classname: PUtf8Char; classnamelen: integer): TRttiCustom;
var
  name: string;
  c: TClass;
begin
  Utf8DecodeToString(classname, classnamelen, name);
  c := FindClass(name);
  if c = nil then
    result := nil
  else
    result := Rtti.RegisterClass(c);
end;

function JsonRetrieveObjectRttiCustom(var Json: PUtf8Char;
  AndGlobalFindClass: boolean): TRttiCustom;
var
  tab: PNormTable;
  P, classname: PUtf8Char;
  classnamelen: integer;
begin
  result := nil;
  P := GotoNextNotSpace(Json + 1); // at input, Json^ = '{'
  tab := @NormToUpperAnsi7;
  if IdemPChar(P, '"CLASSNAME":', tab) then
    inc(P, 12)
  else if IdemPChar(P, 'CLASSNAME:', tab) then
    inc(P, 10)
  else
    exit; // we expect woStoreClassName option to have been used
  P := JsonRetrieveStringField(P, classname, classnamelen, false);
  if P = nil then
    exit; // invalid (maybe too complex) Json string value
  Json := P; // Json^ is either } or ,
  result := Rtti.FindName(classname, classnamelen, rkClass);
  if (result = nil) and
     AndGlobalFindClass then
    result := GlobalFindClass(classname, classnamelen);
end;

procedure GetJsonItemAsRawJson(var P: PUtf8Char; var result: RawJson;
  EndOfObject: PAnsiChar);
var
  B: PUtf8Char;
begin
  result := '';
  if P = nil then
    exit;
  B := GotoNextNotSpace(P);
  P := GotoEndJsonItem(B);
  if P = nil then
    exit;
  FastSetString(RawUtf8(result), B, P - B);
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  if EndOfObject <> nil then
    EndOfObject^ := P^;
  if P^ <> #0 then //if P^=',' then
    repeat
      inc(P)
    until (P^ > ' ') or
          (P^ = #0);
end;

function GetJsonItemAsRawUtf8(var P: PUtf8Char; var output: RawUtf8;
  WasString: PBoolean; EndOfObject: PUtf8Char): boolean;
var
  info: TGetJsonField;
begin
  info.Json := P;
  info.GetJsonValue(output);
  P := info.Json;
  if WasString <> nil then
    WasString^ := info.WasString;
  if EndOfObject <> nil then
    EndOfObject^ := info.EndOfObject;
  result := info.Json <> nil;
end;

function GotoEndJsonItemStrict(P, PMax: PUtf8Char): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init({strict=}true, PMax);
  result := parser.GotoEnd(P);
end;

function GotoEndJsonItem(P, PMax: PUtf8Char): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init({strict=}false, PMax);
  result := parser.GotoEnd(P);
end;

function GotoNextJsonItem(P: PUtf8Char; NumberOfItemsToJump: cardinal;
  EndOfObject: PAnsiChar; PMax: PUtf8Char; Strict: boolean): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init(Strict, PMax);
  result := nil; // to notify unexpected end
  if NumberOfItemsToJump <> 0 then
    repeat
      P := parser.GotoEnd(P);
      if P = nil then
        exit;
      if EndOfObject <> nil then
        EndOfObject^ := P^; // return last jcEndOfJsonFieldOr0
      if P^ <> #0 then
        inc(P);
      dec(NumberOfItemsToJump);
    until NumberOfItemsToJump = 0;
  result := P;
end;

function GotoNextJsonItem(P: PUtf8Char; var EndOfObject: AnsiChar): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init(false, nil);
  result := parser.GotoEnd(P, EndOfObject);
end;

function GetJsonObjectOrArray(P: PUtf8Char;
  EndOfObject: PUtf8Char; Len: PInteger): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.Init({strict=}false, nil);
  result := parser.GotoEnd(P);
  if result = nil then
    exit;
  if Len <> nil then
    Len^ := result - P;
  while (result^ <= ' ') and
        (result^ <> #0) do
    inc(result);
  if EndOfObject <> nil then
    EndOfObject^ := result^;
  if result^ <> #0 then
  begin
    result^ := #0; // make zero-terminated
    inc(result);
  end;
end;

function JsonArrayCount(P, PMax: PUtf8Char; Strict: boolean): integer;
var
  parser: TJsonGotoEndParser;
begin
  {%H-}parser.InitCount(Strict, PMax, stValue);
  if (parser.GotoEnd(P) = nil) and
     (parser.RootCount >= 0) then
    result := 0 // invalid input
  else
    result := parser.RootCount; // negative if PMax was reached
end;

function JsonArrayDecode(P: PUtf8Char; out Values: TPUtf8CharDynArray): boolean;
var
  n, max: PtrInt;
  parser: TJsonGotoEndParser;
begin
  result := false;
  max := 0;
  n := 0;
  {%H-}parser.Init({strict=}false, nil);
  P := GotoNextNotSpace(P);
  if P^ <> ']' then
    repeat
      if max = n then
      begin
        max := NextGrow(max);
        SetLength(Values, max);
      end;
      Values[n] := P;
      inc(n);
      P := parser.GotoEnd(P);
      if P = nil then
        exit; // invalid content, or #0 reached
      if P^ <> ',' then
        break;
      inc(P);
    until false;
  if P^ = ']' then
  begin
    if n <> 0 then
      DynArrayFakeLength(Values{%H-}, n);
    result := true;
  end
  else
    Values := nil;
end;

function JsonArrayItem(P: PUtf8Char; Index: integer): PUtf8Char;
var
  parser: TJsonGotoEndParser;
begin
  if P <> nil then
  begin
    P := GotoNextNotSpace(P);
    if P^ = '[' then
    begin
      {%H-}parser.Init({strict=}false, nil);
      P := GotoNextNotSpace(P + 1);
      if P^ <> ']' then
        repeat
          if Index <= 0 then
          begin
            result := P;
            exit;
          end;
          P := parser.GotoEnd(P);
          if (P = nil) or
             (P^ <> ',') then
            break; // invalid content or #0 reached
          inc(P);
          dec(Index);
        until false;
    end;
  end;
  result := nil;
end;

function JsonObjectPropCount(P, PMax: PUtf8Char; Strict: boolean): PtrInt;
var
  parser: TJsonGotoEndParser;
begin // is very efficiently inlined on FPC
  {%H-}parser.InitCount(Strict, PMax, stObjectName);
  P := parser.GotoEnd(P);
  result := parser.RootCount;
  if P = nil then
    // <0 means aborted when PMax or #0 was reached
    if result >= 0 then
      result := 0; // the JSON input was invalid
end;

function JsonObjectItem(P: PUtf8Char; const PropName: RawUtf8;
  PropNameFound: PRawUtf8): PUtf8Char;
begin
  result := JsonObjectItem(P, pointer(PropName), length(PropName), PropNameFound);
end;

function JsonObjectItem(P: PUtf8Char; PropName: PUtf8Char; PropNameLen: PtrInt;
  PropNameFound: PRawUtf8): PUtf8Char;
var
  name: ShortString; // no memory allocation nor P^ modification
  PropNameUpper: array[byte] of AnsiChar;
  parser: TJsonGotoEndParser;
begin
  if P <> nil then
  begin
    P := GotoNextNotSpace(P);
    if PropNameLen > 0 then
    begin
      if PropName[PropNameLen - 1] = '*' then
      begin
        UpperCopy255Buf(PropNameUpper{%H-}, PropName, PropNameLen - 1)^ := #0;
        PropNameLen := 0; // mark 'PropName*' search
      end;
      if P^ = '{' then
        P := GotoNextNotSpace(P + 1);
      if P^ <> '}' then
        repeat
          GetJsonPropNameShort(P, name);
          if (name[0] = #0) or
             (name[0] > #200) then
            break;
          while (P^ <= ' ') and
                (P^ <> #0) do
            inc(P);
          if PropNameLen = 0 then // 'PropName*'
          begin
            name[ord(name[0]) + 1] := #0; // make ASCIIZ
            if IdemPChar(@name[1], PropNameUpper) then
            begin
              if PropNameFound <> nil then
                FastSetString(PropNameFound^, @name[1], ord(name[0]));
              result := P;
              exit;
            end;
          end
          else if IdemPropName(name, PropName, PropNameLen) then
          begin
            result := P;
            exit;
          end;
          {%H-}parser.Init({strict=}false, nil);
          P := parser.GotoEnd(P);
          if (P = nil) or
             (P^ <> ',') then
            break; // invalid content, or #0 reached
          inc(P);
        until false;
    end;
  end;
  result := nil;
end;

function JsonObjectByPath(JsonObject, PropPath: PUtf8Char): PUtf8Char;
var
  objName: ShortString;
begin
  result := nil;
  if (JsonObject = nil) or
     (PropPath = nil) then
    exit;
  repeat
    GetNextItemShortString(PropPath, @objName, '.');
    if objName[0] = #0 then
      exit;
    JsonObject := JsonObjectItem(JsonObject, @objName[1], ord(objName[0]), nil);
    if JsonObject = nil then
      exit;
  until PropPath = nil; // found full name scope
  result := JsonObject;
end;

function JsonObjectsByPath(JsonObject, PropPath: PUtf8Char): RawUtf8;
var
  itemName, objName, propNameFound, objPath: RawUtf8;
  start, ending, obj: PUtf8Char;
  WR: TTextWriter;
  temp: TTextWriterStackBuffer;

  procedure AddFromStart(const name: RawUtf8);
  begin
    start := GotoNextNotSpace(start);
    ending := GotoEndJsonItem(start);
    if ending = nil then
      exit;
    if WR = nil then
    begin
      WR := TTextWriter.CreateOwnedStream(temp);
      WR.AddDirect('{');
    end
    else
      WR.AddComma;
    WR.AddFieldName(name);
    while (ending > start) and
          (ending[-1] <= ' ') do
      dec(ending); // trim right
    WR.AddNoJsonEscape(start, ending - start);
  end;

begin
  result := '';
  if (JsonObject = nil) or
     (PropPath = nil) then
    exit;
  WR := nil;
  try
    repeat
      GetNextItem(PropPath, ',', itemName);
      if itemName = '' then
        break;
      if itemName[length(itemName)] <> '*' then // single property lookup
      begin
        start := JsonObjectByPath(JsonObject, pointer(itemName));
        if start <> nil then
          AddFromStart(itemName);
      end
      else // 'propname*' may append several properties
      begin
        objPath := '';
        obj := pointer(itemName);
        repeat
          GetNextItem(obj, '.', objName);
          if objName = '' then
            exit;
          propNameFound := '';
          JsonObject := JsonObjectItem(JsonObject, objName, @propNameFound);
          if JsonObject = nil then
            exit;
          if obj = nil then
          begin
            // found full name scope
            start := JsonObject;
            repeat
              AddFromStart(objPath + propNameFound);
              ending := GotoNextNotSpace(ending);
              if ending^ <> ',' then
                break;
              propNameFound := '';
              start := JsonObjectItem(
                GotoNextNotSpace(ending + 1), objName, @propNameFound);
            until start = nil;
            break;
          end
          else
            objPath := objPath + objName + '.';
        until false;
      end;
    until PropPath = nil;
    if WR <> nil then
    begin
      WR.AddDirect('}');
      WR.SetText(result);
    end;
  finally
    WR.Free;
  end;
end;

function JsonObjectAsJsonArrays(Json: PUtf8Char; out keys, values: RawUtf8): integer;
var
  wk, wv: TTextWriter;
  kb, ke, vb, ve: PUtf8Char;
  temp1, temp2: TTextWriterStackBuffer;
  parser: TJsonGotoEndParser;
  n: integer;
begin
  result := -1;
  if (Json = nil) or
     (Json^ <> '{') then
    exit;
  parser.Init({strict=}false, nil);
  n := 0;
  wk := TTextWriter.CreateOwnedStream(temp1);
  wv := TTextWriter.CreateOwnedStream(temp2);
  try
    wk.AddDirect('[');
    wv.AddDirect('[');
    kb := Json + 1;
    repeat
      ke := parser.GotoEnd(kb);
      if (ke = nil) or
         (ke^ <> ':') then
        exit; // invalid input content
      vb := ke + 1;
      ve := parser.GotoEnd(vb);
      if (ve = nil) or
         not (ve^ in [',', '}']) then
        exit;
      wk.AddNoJsonEscape(kb, ke - kb);
      wk.AddComma;
      wv.AddNoJsonEscape(vb, ve - vb);
      wv.AddComma;
      kb := ve + 1;
      inc(n);
    until ve^ = '}';
    wk.CancelLastComma(']');
    wk.SetText(keys);
    wv.CancelLastComma(']');
    wv.SetText(values);
    result := n; // success
  finally
    wv.Free;
    wk.Free;
  end;
end;

function DoRemoveComment(P: PUtf8Char): PUtf8Char;
  {$ifdef HASINLINE} inline; {$endif}
begin
  result := P + 1;
  case result^ of
    '/':
      begin // this is // comment - replace by ' '
        dec(result);
        repeat
          result^ := ' ';
          inc(result)
        until result^ in [#0, #10, #13];
        if result^ <> #0 then
          inc(result);
      end;
    '*':
      begin // this is /* comment - replace by ' ' but keep CRLF
        result[-1] := ' ';
        repeat
          if not (result^ in [#10, #13]) then
            result^ := ' '; // keep CRLF for line numbering (e.g. for error)
          inc(result);
          if PWord(result)^ = ord('*') + ord('/') shl 8 then
          begin
            PWord(result)^ := $2020;
            inc(result, 2);
            break;
          end;
        until result^ = #0;
      end;
  end;
end;

procedure RemoveCommentsFromJson(P: PUtf8Char);
var
  PComma: PUtf8Char;
begin // replace comments by ' ' characters which will be ignored by parser
  if P <> nil then
    while P^ <> #0 do
    begin
      case P^ of
        '"':
          begin
            P := GotoEndOfJsonString2(P + 1, @JSON_CHARS);
            if P^ <> '"' then
              exit;
            inc(P);
          end;
        '/':
          P := DoRemoveComment(P);
        ',':
          begin
            // replace trailing comma by space for strict JSON parsers
            PComma := P;
            repeat
              inc(P)
            until (P^ > ' ') or
                  (P^ = #0);
            if P^ = '/' then
              P := DoRemoveComment(P);
            while (P^ <= ' ') and
                  (P^ <> #0) do
              inc(P);
            if P^ in ['}', ']'] then
              PComma^ := ' '; // see https://github.com/synopse/mORMot/pull/349
          end;
      else
        inc(P);
      end;
    end;
end;

function RemoveCommentsFromJson(const s: RawUtf8): RawUtf8;
begin
  if PosExChar('/', s) = 0 then
    result := s
  else
  begin
    FastSetString(result, pointer(s), length(s));
    RemoveCommentsFromJson(pointer(s)); // remove in-place
  end;
end;

function ParseEndOfObject(P: PUtf8Char; out EndOfObject: AnsiChar): PUtf8Char;
var
  tab: PJsonCharSet;
begin
  if P <> nil then
  begin
    tab := @JSON_CHARS; // mimics GetJsonField()
    while not (jcEndOfJsonFieldOr0 in tab[P^]) do
      inc(P); // not #0 , ] } :
    EndOfObject := P^;
    if P^ <> #0 then
      repeat
        inc(P); // ignore trailing , ] } and any successive spaces
      until (P^ > ' ') or
            (P^ = #0);
  end;
  result := P;
end;

function GetSetNameValue(Names: PShortString; MinValue, MaxValue: integer;
  var P: PUtf8Char; out EndOfObject: AnsiChar): QWord;
var
  info: TGetJsonField;
  tmp: shortstring;
begin
  result := 0;
  if (P = nil) or
     (Names = nil) or
     (MinValue < 0) or
     (MaxValue < 0) then
    exit;
  while (P^ <= ' ') and
        (P^ <> #0) do
    inc(P);
  if P^ = '[' then
  begin // stored as JSON array
    repeat
      inc(P)
    until (P^ > ' ') or
          (P^ = #0);
    if P^ = ']' then
      inc(P)
    else
    begin
      info.Json := P;
      repeat
        info.GetJsonField;
        if (info.Value = nil) or
           not info.WasString then
        begin
          P := nil; // invalid input (expects a JSON array of strings)
          exit;
        end;
        SetNamesValue(Names, MinValue, MaxValue, info.Value, info.ValueLen, result);
      until info.EndOfObject = ']';
      P := info.Json;
      if P = nil then
        exit; // avoid GPF below if already reached the input end
    end;
    P := ParseEndOfObject(P, EndOfObject); // mimics GetJsonField()
    if EndOfObject = #0 then
      P := nil; // as in mORMot 1
  end
  else
  begin
    info.Json := P;
    info.GetJsonField;
    P := info.Json;
    if info.WasString then // stored as CSV text (e.g. from a .INI file)
      while info.Value <> nil do
      begin
        GetNextItemShortString(info.Value, @tmp);
        SetNamesValue(Names, MinValue, MaxValue, @tmp[1], ord(tmp[0]), result);
      end
    else // stored as a 64-bit unsigned integer
      SetQWord(info.Value, result);
    EndOfObject := info.EndOfObject;
  end;
end;

function GetSetNameValue(Info: PRttiInfo;
  var P: PUtf8Char; out EndOfObject: AnsiChar): QWord;
var
  Names: PShortString;
  MinValue, MaxValue: integer;
begin
  if (Info <> nil) and
     (Info^.Kind = rkSet) and
     (Info^.SetEnumType(Names, MinValue, MaxValue) <> nil) then
    result := GetSetNameValue(Names, MinValue, MaxValue, P, EndOfObject)
  else
    result := 0;
end;

function UrlEncodeJsonObject(const UriName: RawUtf8; ParametersJson: PUtf8Char;
  const PropNamesToIgnore: array of RawUtf8; IncludeQueryDelimiter: boolean): RawUtf8;
var
  i, j: PtrInt;
  sep: AnsiChar;
  Params: TNameValuePUtf8CharDynArray;
  temp: TTextWriterStackBuffer;
begin
  if ParametersJson = nil then
    result := UriName
  else
    with TTextWriter.CreateOwnedStream(temp) do
    try
      AddString(UriName);
      if (JsonDecode(ParametersJson, Params, true) <> nil) and
         (Params <> nil) then
      begin
        sep := '?';
        for i := 0 to length(Params) - 1 do
          with Params[i] do
          begin
            for j := 0 to high(PropNamesToIgnore) do
              if IdemPropNameU(PropNamesToIgnore[j], Name.Text, Name.Len) then
              begin
                Name.Len := 0;
                break;
              end;
            if Name.Len = 0 then
              continue; // was within PropNamesToIgnore[]
            if IncludeQueryDelimiter then
              Add(sep);
            AddShort(Name.Text, Name.Len);
            Add('=');
            AddString(UrlEncode(Value.Text));
            sep := '&';
            IncludeQueryDelimiter := true;
          end;
      end;
      SetText(result);
    finally
      Free;
    end;
end;

function UrlEncodeJsonObject(const UriName, ParametersJson: RawUtf8;
  const PropNamesToIgnore: array of RawUtf8; IncludeQueryDelimiter: boolean): RawUtf8;
var
  temp: TSynTempBuffer;
begin
  temp.Init(ParametersJson);
  try
    result := UrlEncodeJsonObject(
      UriName, temp.buf, PropNamesToIgnore, IncludeQueryDelimiter);
  finally
    temp.Done;
  end;
end;

procedure QuotedStrJson(P: PUtf8Char; PLen: PtrInt; var result: RawUtf8;
  const aPrefix, aSuffix: RawUtf8);
var
  temp: TTextWriterStackBuffer;
  Lp, Ls: PtrInt;
  D: PUtf8Char;
begin
  if ((P = nil) or
      (PLen <= 0)) and
     (aPrefix = '') and
     (aSuffix = '') then
    result := '""'
  else if (pointer(result) = pointer(P)) or
          NeedsJsonEscape(P, PLen) then
    // use TJsonWriter.AddJsonEscape() for proper JSON escape
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      AddString(aPrefix);
      AddDirect('"');
      AddJsonEscape(P, PLen);
      AddDirect('"');
      AddString(aSuffix);
      SetText(result);
      exit;
    finally
      Free;
    end
  else
  begin
    // direct allocation if no JSON escape is needed
    Lp := length(aPrefix);
    Ls := length(aSuffix);
    FastSetString(result, PLen + Lp + Ls + 2);
    D := pointer(result); // we checked dest result <> source P above
    if Lp > 0 then
    begin
      MoveFast(pointer(aPrefix)^, D^, Lp);
      inc(D, Lp);
    end;
    D^ := '"';
    MoveFast(P^, D[1], PLen);
    inc(D, PLen);
    D[1] := '"';
    if Ls > 0 then
      MoveFast(pointer(aSuffix)^, D[2], Ls);
  end;
end;

procedure QuotedStrJson(const aText: RawUtf8; var result: RawUtf8;
  const aPrefix, aSuffix: RawUtf8);
begin
  QuotedStrJson(pointer(aText), Length(aText), result, aPrefix, aSuffix);
end;

function QuotedStrJson(const aText: RawUtf8): RawUtf8;
begin
  QuotedStrJson(pointer(aText), Length(aText), result, '', '');
end;

procedure JsonBufferReformat(P: PUtf8Char; out result: RawUtf8;
  Format: TTextWriterJsonFormat);
var
  temp: array[word] of byte; // 64KB buffer
begin
  if P <> nil then
    with TJsonWriter.CreateOwnedStream(@temp, SizeOf(temp)) do
    try
      AddJsonReformat(P, Format, nil);
      SetText(result);
    finally
      Free;
    end;
end;

function JsonReformat(const Json: RawUtf8; Format: TTextWriterJsonFormat): RawUtf8;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json);
  try
    JsonBufferReformat(tmp.buf, result, Format);
  finally
    tmp.Done;
  end;
end;

function JsonBufferReformatToFile(P: PUtf8Char; const Dest: TFileName;
  Format: TTextWriterJsonFormat): boolean;
var
  F: TStream;
  temp: array[word] of word; // 128KB
begin
  try
    F := TFileStreamEx.Create(Dest, fmCreate);
    try
      with TJsonWriter.Create(F, @temp, SizeOf(temp)) do
      try
        AddJsonReformat(P, Format, nil);
        FlushFinal;
      finally
        Free;
      end;
      result := true;
    finally
      F.Free;
    end;
  except
    on Exception do
      result := false;
  end;
end;

function JsonReformatToFile(const Json: RawUtf8; const Dest: TFileName;
  Format: TTextWriterJsonFormat): boolean;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json);
  try
    result := JsonBufferReformatToFile(tmp.buf, Dest, Format);
  finally
    tmp.Done;
  end;
end;

function Expect(var P: PUtf8Char; Pattern: PUtf8Char; PatternLen: PtrInt): boolean;
var
  i: PtrInt;
  J: PUtf8Char;
begin
  result := false;
  J := P;
  if J = nil then
    exit;
  while (J^ <= ' ') and
        (J^ <> #0) do
    inc(J);
  if PPtrInt(J)^ = PPtrInt(Pattern)^ then // PatternLen is at least 8 bytes long
  begin
    for i := SizeOf(PtrInt) to PatternLen - 1 do
      if J[i] <> Pattern[i] then
        exit;
    P := J + PatternLen;
    result := true;
  end;
end;

function IsNotExpandedBuffer(var P: PUtf8Char; PEnd: PUtf8Char;
  var FieldCount, RowCount: PtrInt): boolean;
var
  RowCountPos: PUtf8Char;
begin
  if not Expect(P, FIELDCOUNT_PATTERN, 14) then
  begin
    result := false;
    exit;
  end;
  FieldCount := GetNextItemCardinal(P, #0);
  if Expect(P, ROWCOUNT_PATTERN, 12) then
    RowCount := GetNextItemCardinal(P, #0)    // initial "rowCount":xxxx
  else
  begin
    if PEnd = nil then
      PEnd := P + mormot.core.base.StrLen(P); // late search of ending
    RowCountPos := NotExpandedBufferRowCountPos(P, PEnd);
    if RowCountPos = nil then
      RowCount := -1                          // no "rowCount":xxxx
    else
      RowCount := GetCardinal(RowCountPos);   // trailing "rowCount":xxxx
  end;
  result := (FieldCount <> 0) and
            Expect(P, VALUES_PATTERN, 11);
  if result and
     (RowCount < 0) then
  begin
    RowCount := JsonArrayCount(P, PEnd) div FieldCount; // 900MB/s browse
    if RowCount <= 0 then
      RowCount := -1; // bad format -> no data
  end;
end;

function NotExpandedBufferRowCountPos(P, PEnd: PUtf8Char): PUtf8Char;
var
  i: PtrInt;
begin
  // search for "rowCount": at the end of the JSON buffer
  result := nil;
  if (PEnd <> nil) and
     (PEnd - P > 24) then
    for i := 1 to 24 do
      case PEnd[-i] of
        ']',
        ',':
          exit;
        ':':
          begin
            if CompareMemFixed(PEnd - i - 11, pointer(ROWCOUNT_PATTERN), 11) then
              result := PEnd - i + 1;
            exit;
          end;
      end;
end;

function GotoFieldCountExpanded(P: PUtf8Char): PUtf8Char;
begin
  result := nil;
  while P^ <> '[' do
    if P^ = #0 then
      exit
    else
      inc(P); // need an array of objects
  repeat
    inc(P);
    if P^ = #0 then
      exit;
  until P^ in ['{', ']']; // go to object beginning
  result := P;
end;

function GetFieldCountExpanded(P: PUtf8Char): integer;
var
  EndOfObject: AnsiChar;
  parser: TJsonGotoEndParser;
begin
  result := 0;
  {%H-}parser.Init(false, nil);
  repeat
    P := parser.GotoEnd(P, EndOfObject{%H-}); // ignore Name
    P := parser.GotoEnd(P, EndOfObject);      // ignore Value
    if P = nil then
    begin // unexpected end
      result := 0;
      exit;
    end;
    inc(result);
    if EndOfObject = '}' then
      break; // end of object
  until false;
end;

procedure FormatParams(const Format: RawUtf8; const Args, Params: array of const;
  JsonFormat: boolean; var Result: RawUtf8);
var
  A, P: PtrInt;
  F, FDeb: PUtf8Char;
  isParam: AnsiChar;
  tmp: TTempUtf8;
  wasString: boolean;
  temp: TTextWriterStackBuffer;
begin
  if (Format = '') or
     ((high(Args) < 0) and
      (high(Params) < 0)) then
    // no formatting to process, but may be a const
    // -> make unique since e.g. _JsonFmt() will parse it in-place
    FastSetString(Result, pointer(Format), length(Format))
  else if high(Params) < 0 then
    // faster function with no ?
    FormatUtf8(Format, Args, Result)
  else if Format = '%' then
    // optimize raw conversion
    VarRecToUtf8(Args[0], Result)
  else
    // handle any number of parameters with minimal memory allocations
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      A := 0;
      P := 0;
      F := pointer(Format);
      while F^ <> #0 do
      begin
        if (F^ <> '%') and
           (F^ <> '?') then
        begin
          // handle plain text between % ? markers
          FDeb := F;
          repeat
            inc(F);
          until F^ in [#0, '%', '?'];
          AddNoJsonEscape(FDeb, F - FDeb);
          if F^ = #0 then
            break;
        end;
        isParam := F^;
        inc(F); // jump '%' or '?'
        if (isParam = '%') and
           (A <= high(Args)) then
        begin
          // handle % substitution
          if Args[A].VType = vtObject then
            AddShort(ClassNameShort(Args[A].VObject)^)
          else
            Add(Args[A]);
          inc(A);
        end
        else if (isParam = '?') and
                (P <= high(Params)) then
        begin
          // handle ? substitution as JSON or SQL
          if JsonFormat then
            AddJsonEscape(Params[P]) // does the JSON magic including "quotes"
          else
          begin
            Add(':', '('); // markup for SQL parameter binding
            VarRecToTempUtf8(Params[P], tmp, @wasString);
            if wasString then
              AddQuotedStr(tmp.Text, tmp.Len, '''') // SQL quote
            else
              AddShort(tmp.Text, tmp.Len); // numbers
            if tmp.TempRawUtf8 <> nil then
              RawUtf8(tmp.TempRawUtf8) := '';  // release temp memory
            Add(')', ':');
          end;
          inc(P);
        end
        else
        begin
          // no more available Args or Params -> add all remaining text
          AddNoJsonEscape(F, length(Format) - (F - pointer(Format)));
          break;
        end;
      end;
      SetText(Result);
    finally
      Free;
    end;
end;

function FormatSql(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8;
begin
  FormatParams(Format, Args, Params, {json=}false, result);
end;

function FormatJson(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8;
begin
  FormatParams(Format, Args, Params, {json=}true, result);
end;

{$ifndef PUREMORMOT2}
function FormatUtf8(const Format: RawUtf8; const Args, Params: array of const;
  JsonFormat: boolean): RawUtf8;
begin
  FormatParams(Format, Args, Params, JsonFormat, result);
end;
{$endif PUREMORMOT2}


{ ********** Low-Level JSON Serialization for all TRttiParserType }

// some methods defined here for proper inlining
procedure TJsonWriter.BlockAfterItem(Options: TTextWriterWriteObjectOptions);
begin
  B[1] := ',';
  inc(B);
  if woHumanReadable in Options then
    AddCRAndIndent;
end;

procedure TJsonWriter.BlockBegin(Starter: AnsiChar;
  Options: TTextWriterWriteObjectOptions);
begin
  if woHumanReadable in Options then
  begin
    AddCRAndIndent;
    inc(fHumanReadableLevel);
  end;
  Add(Starter);
end;

procedure TJsonWriter.BlockEnd(Stopper: AnsiChar;
  Options: TTextWriterWriteObjectOptions);
begin
  if woHumanReadable in Options then
  begin
    dec(fHumanReadableLevel);
    AddCRAndIndent;
  end;
  B[1] := Stopper;
  inc(B);
end;


{ TJsonSaveContext }

procedure TJsonSaveContext.Init(WR: TJsonWriter;
  WriteOptions: TTextWriterWriteObjectOptions; Rtti: TRttiCustom);
begin
  W := WR;
  if Rtti <> nil then
    WriteOptions := WriteOptions + TRttiJson(Rtti).fIncludeWriteOptions;
  Options := WriteOptions;
  Info := Rtti;
  Prop := nil;
end;

procedure TJsonSaveContext.AddShort(PS: PShortString);
begin
  W.Add('"');
  if twoTrimLeftEnumSets in W.CustomOptions then
    W.AddTrimLeftLowerCase(PS)
  else
    W.AddShort(PS^);
  W.AddDirect('"');
end;

procedure TJsonSaveContext.Add64(Value: PInt64; UnSigned: boolean);
begin
  if woInt64AsHex in Options then
    if Value^ = 0 then
      W.Add('"', '"')
    else
      W.AddBinToHexDisplayLower(Value, SizeOf(Value^), '"')
  else if UnSigned then
    W.AddQ(PQWord(Value)^)
  else
    W.Add(Value^);
end;

procedure TJsonSaveContext.AddDateTime(Value: PDateTime; WithMS: boolean);
var
  d: double;
begin
  if woDateTimeWithMagic in Options then
    W.AddShorter(JSON_SQLDATE_MAGIC_QUOTE_STR)
  else
    W.Add('"');
  d := unaligned(Value^);
  W.AddDateTime(d, WithMS);
  if woDateTimeWithZSuffix in Options then
    if not (twoDateTimeWithZ in W.CustomOptions) then // if not already done
      if frac(d) = 0 then // FireFox can't decode short form "2017-01-01Z"
        W.AddShort('T00:00:00Z') // the same pattern for date and dateTime
      else
        W.Add('Z');
  W.AddDirect('"');
end;

procedure TJsonSaveContext.AddShortBoolean(PS: PShortString; Value: boolean);
begin
  AddShort(PS);
  W.Add(':');
  W.Add(Value);
end;


procedure _JS_Null(Data: PBoolean; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.AddNull;
end;

procedure _JS_Boolean(Data: PBoolean; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add(Data^);
end;

procedure _JS_Byte(Data: PByte; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.AddU(Data^);
end;

procedure _JS_SmallInt(Data: PSmallInt; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.Add(Data^);
end;

procedure _JS_ShortInt(Data: PShortInt; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.Add(Data^);
end;

procedure _JS_Cardinal(Data: PCardinal; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.AddU(Data^);
end;

procedure _JS_Currency(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddCurr64(Data);
end;

procedure _JS_Double(Data: PDouble; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddDouble(unaligned(Data^));
end;

procedure _JS_Extended(Data: PSynExtended; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddDouble({$ifndef TSYNEXTENDED80}unaligned{$endif}(Data^));
end;

procedure _JS_Int64(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  Ctxt.Add64(Data, {unsigned=}false);
end;

procedure _JS_Integer(Data: PInteger; const Ctxt: TJsonSaveContext);
var
  W: TJsonWriter;
begin
  W := Ctxt.W;
  W.Add(Data^);
end;

procedure _JS_QWord(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  Ctxt.Add64(Data, {unsigned=}true);
end;

procedure _JS_RawByteString(Data: PRawByteString; const Ctxt: TJsonSaveContext);
begin
  if (Data^ = '') or
     ((rcfIsRawBlob in Ctxt.Info.Cache.Flags) and
      not (woRawBlobAsBase64 in Ctxt.Options)) then
    Ctxt.W.AddNull
  else
  begin
    Ctxt.W.Add('"'); // no magic trailer as with mORMot 1
    Ctxt.W.WrBase64(pointer(Data^), length(Data^), {withmagic=}false);
    Ctxt.W.AddDirect('"');
  end;
end;

procedure _JS_RawJson(Data: PRawJson; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddRawJson(Data^);
end;

procedure _JS_RawUtf8(Data: PAnsiChar; const Ctxt: TJsonSaveContext);
var
  cp: cardinal;
begin
  Ctxt.W.Add('"');
  Data := PPointer(Data)^;
  if Data <> nil then
  begin
    cp := Ctxt.Info.Cache.CodePage;
    if cp = CP_UTF8 then
      Ctxt.W.AddJsonEscape(Data, {len=}0)
    else
      Ctxt.W.AddAnyAnsiBuffer(Data, PStrLen(Data - _STRLEN)^, twJsonEscape, cp);
  end;
  Ctxt.W.AddDirect('"');
end;

procedure _JS_Ansi(Data: PAnsiChar; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add('"');
  Data := PPointer(Data)^;
  if Data <> nil then
    with PStrRec(Data - SizeOf(TStrRec))^ do
      // will handle any AnsiString, WinAnsiString or other CP
      Ctxt.W.AddAnyAnsiBuffer(Data, length, twJsonEscape,
       {$ifdef HASCODEPAGE} codePage {$else} Ctxt.Info.Cache.CodePage {$endif});
  Ctxt.W.AddDirect('"');
end;

procedure _JS_Single(Data: PSingle; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddSingle(Data^);
end;

procedure _JS_Unicode(Data: PPWord; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add('"');
  Ctxt.W.AddJsonEscapeW(Data^);
  Ctxt.W.AddDirect('"');
end;

procedure _JS_Char(Data: PAnsiChar; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add('"');
  if Data^ <> #0 then // #0 will be serialized as ""
    Ctxt.W.AddJsonEscape(Data, 1);
  Ctxt.W.AddDirect('"');
end;

procedure _JS_WideChar(Data: PWord; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add('"');
  if Data^ <> 0 then
    Ctxt.W.AddJsonEscapeW(Data, 1);
  Ctxt.W.AddDirect('"');
end;

procedure _JS_DateTime(Data: PDateTime; const Ctxt: TJsonSaveContext);
begin
  Ctxt.AddDateTime(Data, {withms=}false);
end;

procedure _JS_DateTimeMS(Data: PDateTime; const Ctxt: TJsonSaveContext);
begin
  Ctxt.AddDateTime(Data, {withms=}true);
end;

procedure _JS_GUID(Data: PGUID; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add(Data, '"');
end;

procedure _JS_Hash(Data: pointer; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddBinToHexDisplayLower(Data, Ctxt.Info.Size, '"');
end;

procedure _JS_Binary(Data: pointer; const Ctxt: TJsonSaveContext);
begin
  if IsZeroSmall(Data, Ctxt.Info.BinarySize) then
    Ctxt.W.Add('"', '"') // serialize "" for 0 value
  else
    Ctxt.W.AddBinToHexDisplayLower(Data, Ctxt.Info.BinarySize, '"');
end;

procedure _JS_TimeLog(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  if woTimeLogAsText in Ctxt.Options then
    Ctxt.W.AddTimeLog(Data, '"')
  else
    Ctxt.Add64(Data, true);
end;

procedure _JS_UnixTime(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  if woTimeLogAsText in Ctxt.Options then
    Ctxt.W.AddUnixTime(Data, '"')
  else
    Ctxt.Add64(Data, true);
end;

procedure _JS_UnixMSTime(Data: PInt64; const Ctxt: TJsonSaveContext);
begin
  if woTimeLogAsText in Ctxt.Options then
    Ctxt.W.AddUnixMSTime(Data, {withms=}true, '"')
  else
    Ctxt.Add64(Data, true);
end;

procedure _JS_WinAnsi(Data: PWinAnsiString; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.Add('"');
  Ctxt.W.AddAnyAnsiBuffer(pointer(Data^), length(Data^), twJsonEscape, CP_WINANSI);
  Ctxt.W.AddDirect('"');
end;

procedure _JS_Word(Data: PWord; const Ctxt: TJsonSaveContext);
begin
  Ctxt.W.AddU(Data^);
end;

procedure _JS_Interface(Data: PInterface; const Ctxt: TJsonSaveContext);
begin
  {$ifdef HASINTERFACEASTOBJECT}
  // interfaces can be saved/serialized as their own object instance,
  // but not restored/unserialized in _JL_Interface()
  if Data^ <> nil then
    Ctxt.W.WriteObject(Data^ as TObject)
  else
  {$endif HASINTERFACEASTOBJECT}
    Ctxt.W.AddNull;
end;

procedure _JS_PUtf8Char(Data: PPUtf8Char; const Ctxt: TJsonSaveContext);
begin
  // PUtf8Char can be saved/serialized as their own UTF-8 content,
  // but not restored/unserialized in _JL_PUtf8Char()
  Ctxt.W.Add('"');
  if Data^ <> nil then
    Ctxt.W.AddJsonEscape(Data^, {len=}0);
  Ctxt.W.AddDirect('"');
end;

procedure _JS_ID(Data: PInt64; const Ctxt: TJsonSaveContext);
var
  _str: ShortString;
begin
  Ctxt.W.Add(Data^);
  if woIDAsIDstr in Ctxt.Options then
  begin
    Ctxt.W.BlockAfterItem(Ctxt.Options);
    if (Ctxt.Prop <> nil) and
       (Ctxt.Prop^.Name <> '') then
    begin
      Ansi7StringToShortString(Ctxt.Prop^.Name, _str);
      AppendShort('_str', _str);
      Ctxt.W.WriteObjectPropNameShort(_str, Ctxt.Options);
    end
    else
      Ctxt.W.WriteObjectPropNameShort('ID_str', Ctxt.Options);
    Ctxt.W.Add('"');
    Ctxt.W.Add(Data^);
    Ctxt.W.AddDirect('"');
  end;
end;

procedure _JS_Enumeration(Data: PByte; const Ctxt: TJsonSaveContext);
var
  o: TTextWriterOptions;
  PS: PShortString;
begin
  o := Ctxt.W.CustomOptions;
  if (Ctxt.Options * [woFullExpand, woHumanReadable, woEnumSetsAsText] <> []) or
     (o * [twoEnumSetsAsBooleanInRecord, twoEnumSetsAsTextInRecord] <> []) then
  begin
    PS := Ctxt.Info.Cache.EnumInfo^.GetEnumNameOrd(Data^);
    if twoEnumSetsAsBooleanInRecord in o then
      Ctxt.AddShortBoolean(PS, true)
    else
      Ctxt.AddShort(PS);
    if woHumanReadableEnumSetAsComment in Ctxt.Options then
      Ctxt.Info.Cache.EnumInfo^.GetEnumNameAll(Ctxt.W.fBlockComment, '', true);
  end
  else
    Ctxt.W.AddU(Data^);
end;

procedure _JS_Set(Data: PCardinal; const Ctxt: TJsonSaveContext);
var
  PS: PShortString;
  i: cardinal;
  v: QWord;
  o: TTextWriterOptions;
begin
  o := Ctxt.W.CustomOptions;
  if twoEnumSetsAsBooleanInRecord in o then
  begin
    // { "set1": true/false, .... } with proper indentation
    PS := Ctxt.Info.Cache.EnumList;
    Ctxt.W.BlockBegin('{', Ctxt.Options);
    i := 0;
    repeat
      if i >= Ctxt.Info.Cache.EnumMin then
        Ctxt.AddShortBoolean(PS, GetBitPtr(Data, i));
      if i = Ctxt.Info.Cache.EnumMax then
        break;
      inc(i);
      Ctxt.W.BlockAfterItem(Ctxt.Options);
      inc(PByte(PS), PByte(PS)^ + 1); // next
    until false;
    Ctxt.W.BlockEnd('}', Ctxt.Options);
  end
  else if (Ctxt.Options * [woFullExpand, woHumanReadable, woEnumSetsAsText] <> []) or
          (twoEnumSetsAsTextInRecord in o) then
  begin
    // [ "set1", "set4", .... } on same line
    Ctxt.W.Add('[');
    if ((twoFullSetsAsStar in o) or
        (woHumanReadableFullSetsAsStar in Ctxt.Options)) and
       GetAllBits(Data^, Ctxt.Info.Cache.EnumMax + 1) then
      Ctxt.W.AddShorter('"*"')
    else
    begin
      PS := Ctxt.Info.Cache.EnumList;
      for i := 0 to Ctxt.Info.Cache.EnumMax do
      begin
        if (i >= Ctxt.Info.Cache.EnumMin) and
           GetBitPtr(Data, i) then
        begin
          Ctxt.AddShort(PS);
          Ctxt.W.AddComma;
        end;
        inc(PByte(PS), PByte(PS)^ + 1); // next
      end;
      Ctxt.W.CancelLastComma;
    end;
    Ctxt.W.AddDirect(']');
    if woHumanReadableEnumSetAsComment in Ctxt.Options then
      Ctxt.Info.Cache.EnumInfo^.GetEnumNameAll(
        Ctxt.W.fBlockComment, '"*" or a set of ', true);
  end
  else
  begin
    // standard serialization as unsigned integer (up to 64 items)
    v := 0;
    MoveFast(Data^, v, Ctxt.Info.Size);
    Ctxt.W.AddQ(v);
  end;
end;

procedure _JS_Array(Data: PAnsiChar; const Ctxt: TJsonSaveContext);
var
  n: integer;
  jsonsave: TRttiJsonSave;
  c: TJsonSaveContext;
begin
  {%H-}c.Init(Ctxt.W, Ctxt.Options, Ctxt.Info.ArrayRtti);
  c.W.BlockBegin('[', c.Options);
  jsonsave := c.Info.JsonSave; // e.g. PT_JSONSAVE/PTC_JSONSAVE
  if Assigned(jsonsave) then
  begin
    // efficient JSON serialization
    n := Ctxt.Info.Cache.ItemCount;
    repeat
      jsonsave(Data, c);
      dec(n);
      if n = 0 then
        break;
      c.W.BlockAfterItem(c.Options);
      inc(Data, c.Info.Cache.Size);
    until false;
  end
  else
    // fallback to raw RTTI binary serialization with Base64 encoding
    c.W.BinarySaveBase64(Data, Ctxt.Info.Info, [rkArray],
      {withMagic=}true, {withcrc=}false);
  c.W.BlockEnd(']', c.Options);
end;

procedure _JS_DynArray_Custom(Data: pointer; const Ctxt: TJsonSaveContext);
begin
  // TRttiJson.RegisterCustomSerializer() custom callback for each item
  TOnRttiJsonWrite(TRttiJson(Ctxt.Info).fJsonWriter)(
    Ctxt.W, Data, Ctxt.Options);
end;

procedure _JS_OneProp(var c: TJsonSaveContext; p: PRttiCustomProp; Data: PAnsiChar);
  {$ifdef HASINLINE} inline; {$endif}
begin
  if (woHideSensitivePersonalInformation in c.Options) and
     (rcfSpi in p^.Value.Flags) then
    c.W.AddShorter('"***"')
  else if p^.OffsetGet >= 0 then
  begin
    // direct value write (record field or plain class property)
    c.Info := p^.Value;
    c.Prop := p;
    TRttiJsonSave(c.Info.JsonSave)(Data + p^.OffsetGet, c);
  end
  else
    // need to call a getter method
    p^.AddValueJson(c.W, Data, c.Options);
end;

type
  TCCHook = class(TObjectWithCustomCreate); // to access its protected methods

procedure _JS_NonExpanded(var c: TJsonSaveContext; Data: PAnsiChar; n: integer);
var
  v: PAnsiChar;
  item: TRttiCustom;
  p: PRttiCustomProp;
  f: integer;
begin
  // {"fieldCount":2,"rowCount":20,"values":["f1","f2","1v1",1v2,"2v1",2v2...]}
  item := c.Info;
  c.W.BlockBegin('{', c.Options);
  c.W.AddShort('"fieldCount":');
  c.W.AddU(item.Props.CountNonVoid);
  c.W.AddShort(',"rowCount":');
  c.W.AddU(n);
  c.W.AddShort(',"values":[');
  c.W.AddString(item.Props.NamesAsJsonArray); // pre-computed - with trailing ,
  if n <> 0 then
    repeat
      if item.Kind = rkClass then
        v := PPointer(Data)^
      else
        v := Data;
      p := pointer(item.Props.List);
      f := item.Props.Count;
      repeat
        if p^.Name <> '' then
        begin
          if not (rcfHookWriteProperty in item.Flags) or
             not TCCHook(v).RttiWritePropertyValue(c.W, p, c.Options) then
            _JS_OneProp(c, p, v);
          c.W.AddComma;  // no c.W.BlockAfterItem() if non-expanded
        end;
        inc(p);
        dec(f);
      until f = 0;
      inc(Data, item.Cache.Size);
      dec(n);
    until n = 0;
  c.W.CancelLastComma(']');
  c.W.BlockEnd('}', c.Options);
end;

procedure _JS_DynArray(Data: PPointer; const Ctxt: TJsonSaveContext);
var
  n, s: PtrInt;
  jsonsave: TRttiJsonSave;
  P: PAnsiChar;
  c: TJsonSaveContext;
begin
  {%H-}c.Init(Ctxt.W, Ctxt.Options, Ctxt.Info.ArrayRtti);
  if (twoNonExpandedArrays in c.W.CustomOptions) and
     (c.Info <> nil) and
     (c.Info.Props.CountNonVoid > 0) and
     (Data^ <> nil) then
  begin
    // non-expanded format efficient serialization
    n := PDALen(PAnsiChar(Data^) - _DALEN)^ + _DAOFF; // length(Data)
    if n <> 1 then // expanded is fine for a single object array
    begin
      _JS_NonExpanded(c, Data^, n);
      exit;
    end;
  end;
  c.W.BlockBegin('[', c.Options);
  if Data^ <> nil then
  begin
    if TRttiJson(Ctxt.Info).fJsonWriter.Code <> nil then
    begin
      c.Info := Ctxt.Info;
      jsonsave := @_JS_DynArray_Custom; // redirect to custom callback
    end
    else if c.Info = nil then
      jsonsave := nil
    else
      jsonsave := c.Info.JsonSave; // e.g. PT_JSONSAVE/PTC_JSONSAVE
    if Assigned(jsonsave) then
    begin
      // efficient JSON serialization
      P := Data^;
      n := PDALen(P - _DALEN)^ + _DAOFF; // length(Data)
      s := Ctxt.Info.Cache.ItemSize; // c.Info may be nil
      repeat
        jsonsave(P, c);
        dec(n);
        if n = 0 then
          break;
        c.W.BlockAfterItem(c.Options);
        inc(P, s);
      until false;
    end
    else
      // fallback to raw RTTI binary serialization with Base64 encoding
      c.W.BinarySaveBase64(Data, Ctxt.Info.Info, [rkDynArray],
        {withMagic=}true, {withcrc=}false);
  end
  else if (woHumanReadableEnumSetAsComment in Ctxt.Options) and
          (c.Info <> nil) and
          (rcfHasNestedProperties in c.Info.Flags) then
    // void dynarray should include record/T*ObjArray fields as comment
    c.Info.Props.AsText(c.W.fBlockComment, true, 'array of {', '}');
  c.W.BlockEnd(']', c.Options);
end;

procedure _JS_Variant(Data: PVarData; const Ctxt: TJsonSaveContext); forward;

/// use pointer to allow any kind of Data^ type in _JS_*() functions
// - typecast to TRttiJsonSave for proper function call
const
  VARIANT_JSONSAVE: array[varEmpty .. varOleUInt] of pointer = (
    {0}  @_JS_Null, @_JS_Null, @_JS_SmallInt, @_JS_Integer, @_JS_Single,
    {5}  @_JS_Double, @_JS_Currency, @_JS_DateTime, nil, nil,
    {10} nil, @_JS_Boolean, nil, nil, nil,
    {15} nil, @_JS_ShortInt, @_JS_Byte, @_JS_Word, @_JS_Cardinal,
    {20} @_JS_Int64, @_JS_QWord, @_JS_Integer, @_JS_Cardinal);

  // rkRecord and rkClass are handled in TRttiJson.SetParserType
  PT_JSONSAVE: array[TRttiParserType] of pointer = (
    nil, @_JS_Array, @_JS_Boolean, @_JS_Byte, @_JS_Cardinal, @_JS_Currency,
    @_JS_Double, @_JS_Extended, @_JS_Int64, @_JS_Integer, @_JS_QWord,
    @_JS_RawByteString, @_JS_RawJson, @_JS_RawUtf8, nil, @_JS_Single,
    {$ifdef UNICODE} @_JS_Unicode {$else} @_JS_Ansi {$endif},
    @_JS_Unicode, @_JS_DateTime, @_JS_DateTimeMS, @_JS_GUID, @_JS_Hash,
    @_JS_Hash, @_JS_Hash, nil, @_JS_TimeLog, @_JS_Unicode, @_JS_UnixTime,
    @_JS_UnixMSTime, @_JS_Variant, @_JS_Unicode, @_JS_WinAnsi, @_JS_Word,
    @_JS_Enumeration, @_JS_Set, nil, @_JS_DynArray, @_JS_Interface,
    @_JS_PUtf8Char, nil);

  PTC_JSONSAVE: array[TRttiParserComplexType] of pointer = (
    nil, nil, nil, nil, @_JS_ID, @_JS_ID, @_JS_QWord, @_JS_QWord, @_JS_QWord);

procedure _JS_Variant(Data: PVarData; const Ctxt: TJsonSaveContext);
var
  vt: cardinal;
  cv: TSynInvokeableVariantType;
  save: TRttiJsonSave;
begin
  repeat
    vt := Data^.VType;
    if vt <> varVariantByRef then
      break;
    Data := Data^.VPointer;
  until false;
  if vt <= high(VARIANT_JSONSAVE) then
  begin
    save := VARIANT_JSONSAVE[vt];
    if Assigned(save) then
    begin
      save(@Data^.VAny, Ctxt);
      exit;
    end;
  end;
  case vt of // most common strings
    varString:
      {$ifdef HASCODEPAGE}
      _JS_Ansi(@Data^.VAny, Ctxt);
      {$else} // old Delphi can't use Ctxt.Info.Cache.CodePage 
      Ctxt.W.AddText(RawByteString(Data^.VString), twJsonEscape);
      {$endif HASCODEPAGE}
    {$ifdef HASVARUSTRING} varUString, {$endif} varOleStr:
      _JS_Unicode(@Data^.VAny, Ctxt);
  else
    begin
      cv := FindSynVariantType(vt); // our custom types
      if cv <> nil then
        cv.ToJson(Ctxt.W, Data)
      else // unsupported or seldom used
        Ctxt.W.AddVariant(PVariant(Data)^, twJsonEscape, Ctxt.Options);
    end;
  end;
end;

procedure AppendExceptionLocation(w: TJsonWriter; e: ESynException);
begin // call TDebugFile.FindLocationShort if mormot.core.log is used
  w.Add('"');
  w.AddShort(GetExecutableLocation(e.RaisedAt));
  w.Add('"');
end;

// serialization of properties for both records and classes
procedure _JS_RttiCustom(Data: PAnsiChar; const Ctxt: TJsonSaveContext);
var
  nfo: TRttiJson;
  p: PRttiCustomProp;
  t: TClass;
  n: integer;
  flags: set of (isNotFirst, noStored, noDefault, noHook, noVoid, isHumanReadable);
  c: TJsonSaveContext; // dedicated context used for fields/properties
begin
  c.W := Ctxt.W;
  c.Options := Ctxt.Options;
  nfo := TRttiJson(Ctxt.Info);
  if nfo.Kind = rkClass then
  begin
    if Data <> nil then
      Data := PPointer(Data)^; // class instances are accessed by reference
    if Data = nil then
    begin
      c.W.AddNull; // append 'null' for nil class instance
      exit;
    end;
    t := PClass(Data)^; // actual class of this instance
    if t <> nfo.ValueClass then
      nfo := TRttiJson(Rtti.RegisterClass(t)); // work on proper inherited class
    flags := [];
    if (woStoreStoredFalse in c.Options) or
       (rcfDisableStored in nfo.Flags) then
      include(flags, noStored);
    if not (woDontStoreDefault in c.Options) then
      include(flags, noDefault);
    if not (rcfHookWriteProperty in nfo.Flags) then
      include(flags, noHook);
  end
  else
  begin
    exclude(c.Options, woFullExpand); // not available for null or records
    flags := [noStored, noDefault, noHook];
  end;
  if nfo.fJsonWriter.Code <> nil then // TRttiJson.RegisterCustomSerializer()
  begin // e.g. TOrm.RttiJsonWrite
    TOnRttiJsonWrite(nfo.fJsonWriter)(c.W, Data, c.Options);
    exit;
  end;
  if not (rcfHookWrite in nfo.Flags) or
     not TCCHook(Data).RttiBeforeWriteObject(c.W, c.Options) then
  begin
    // regular JSON serialization using nested fields/properties
    if not ((woDontStoreVoid in c.Options) or
            (twoIgnoreDefaultInRecord in c.W.CustomOptions)) then
      include(flags, noVoid);
    if woHumanReadable in c.Options then
    begin
      include(flags, isHumanReadable);
      c.W.BlockBegin('{', c.Options)
    end
    else
      c.W.Add('{');
    c.Prop := pointer(nfo.Props.List);
    n := nfo.Props.Count;
    if (nfo.Kind = rkClass) and
       (c.Options * [woFullExpand, woStoreClassName, woStorePointer,
                     woDontStoreInherited] <> []) then
    begin
      if woFullExpand in c.Options then
      begin
        c.W.AddInstanceName(TObject(Data), ':');
        c.W.BlockBegin('{', c.Options);
      end;
      if woStoreClassName in c.Options then
      begin
        c.W.WriteObjectPropNameShort('ClassName', c.Options);
        c.W.AddDirect('"');
        c.W.AddShort(ClassNameShort(PClass(Data)^)^);
        c.W.AddDirect('"');
        if (c.Prop <> nil) or
           (woStorePointer in c.Options) then
          c.W.BlockAfterItem(c.Options);
      end;
      if woStorePointer in c.Options then
      begin
        c.W.WriteObjectPropNameShort('Address', c.Options);
        if nfo.ValueRtlClass = vcESynException then
          AppendExceptionLocation(c.W, ESynException(Data))
        else
          c.W.AddPointer(PtrUInt(Data), '"');
        if c.Prop <> nil then
          c.W.BlockAfterItem(c.Options);
      end;
      if woDontStoreInherited in c.Options then
        with nfo.Props do
          if NotInheritedIndex <> 0 then
          begin
            // List[NotInheritedIndex]..List[Count-1] is the last class level
            inc(c.Prop, NotInheritedIndex);
            dec(n, NotInheritedIndex);
          end;
    end;
    if n > 0 then
    begin
      // this is the main loop serializing Info.Props[]
      p := c.Prop;
      repeat
        if // handle Props.NameChange() set to Name='' to ignore this field
           (p^.Name <> '') and
           // handle woStoreStoredFalse flag and "stored" attribute in code
           ((p^.Stored = rpsTrue) or // most common case
            (noStored in flags) or
            ((p^.Stored = rpsGetter) and
             (p^.Prop.IsStoredGetter(pointer(Data))))) and
           // handle woDontStoreDefault flag over "default" attribute in code
           ((noDefault in flags) or
            (p^.OrdinalDefault = NO_DEFAULT) or
            not p^.ValueIsDefault(Data)) and
           // detect 0 numeric values and empty strings
           ((noVoid in flags) or
            not p^.ValueIsVoid(Data)) then
        begin
          // if we reached here, we should serialize this property
          if isNotFirst in flags then
            // append ',' and proper indentation if a field was just appended
            c.W.BlockAfterItem(c.Options);
          if isHumanReadable in flags then
            c.W.WriteObjectPropNameHumanReadable(pointer(p^.Name), length(p^.Name))
          else
            c.W.AddProp(pointer(p^.Name), length(p^.Name));
          if (noHook in flags) or
             not TCCHook(Data).RttiWritePropertyValue(c.W, p, c.Options) then
            _JS_OneProp(c, p, Data);
          include(flags, isNotFirst);
        end;
        dec(n);
        if n = 0 then
          break;
        inc(p);
      until false;
    end;
    if rcfHookWrite in nfo.Flags then
       TCCHook(Data).RttiAfterWriteObject(c.W, c.Options);
    if isHumanReadable in flags then
      c.W.BlockEnd('}', c.Options)
    else
      c.W.AddDirect('}');
    if woFullExpand in c.Options then
      c.W.BlockEnd('}', c.Options);
  end;
end;

// most known RTL classes custom serialization

procedure _JS_Objects(W: TJsonWriter; Value: PObject; Count: integer;
  Options: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  save: TRttiJsonSave;
  c, v: pointer; // reuse ctxt.Info if classes are the same (very likely)
begin
  c := nil;
  save := nil;
  {%H-}ctxt.Init(W, Options, nil);
  W.BlockBegin('[', Options);
  if Count > 0 then
    repeat
      v := Value^;
      if v = nil then
        W.AddNull
      else
      begin
        v := PPointer(v)^; // check Value class
        if v <> c then
        begin
          // need to retrieve the RTTI
          c := v;
          ctxt.Info := Rtti.RegisterClass(TClass(v));
          save := ctxt.Info.JsonSave;
        end;
        // this is where each object is serialized
        save(pointer(Value), ctxt);
      end;
      dec(Count);
      if Count = 0 then
        break;
      W.BlockAfterItem(Options);
      inc(Value);
    until false;
  W.BlockEnd(']', Options);
end;

procedure _JS_TList(Data: PList; const Ctxt: TJsonSaveContext);
begin
  if Data^ = nil then
    Ctxt.W.AddNull
  else
    _JS_Objects(Ctxt.W, pointer(Data^.List), Data^.Count, Ctxt.Options);
end;

procedure _JS_TObjectList(Data: PObjectList; const Ctxt: TJsonSaveContext);
var
  o: TTextWriterWriteObjectOptions;
begin
  if Data^ = nil then
  begin
    Ctxt.W.AddNull;
    exit;
  end;
  o := Ctxt.Options;
  if not (woObjectListWontStoreClassName in o) then
    include(o, woStoreClassName);
  _JS_Objects(Ctxt.W, pointer(Data^.List), Data^.Count, o);
end;

procedure _JS_TCollection(Data: PCollection; const Ctxt: TJsonSaveContext);
var
  item: TCollectionItem;
  i, last: PtrInt;
  c: TJsonSaveContext; // reuse same context for all collection items
begin
  if Data^ = nil then
  begin
    Ctxt.W.AddNull;
    exit;
  end;
  // can't use AddObjects() since we don't have access to the TCollection list
  {%H-}c.Init(Ctxt.W, Ctxt.Options, Rtti.RegisterClass(Data^.ItemClass));
  c.W.BlockBegin('[', c.Options);
  i := 0;
  last := Data^.Count - 1;
  if last >= 0 then
    repeat
      item := Data^.Items[i];
      TRttiJsonSave(c.Info.JsonSave)(@item, c);
      if i = last then
        break;
      c.W.BlockAfterItem(c.Options);
      inc(i);
    until false;
  c.W.BlockEnd(']', c.Options);
end;

procedure _JS_TStrings(Data: PStrings; const Ctxt: TJsonSaveContext);
var
  i, last: PtrInt;
begin
  if Data^ = nil then
  begin
    Ctxt.W.AddNull;
    exit;
  end;
  Ctxt.W.BlockBegin('[', Ctxt.Options);
  i := 0;
  last := Data^.Count - 1;
  if last >= 0 then
    repeat
      Ctxt.W.Add('"');
      Ctxt.W.AddJsonEscapeString(Data^.Strings[i]);
      Ctxt.W.AddDirect('"');
      if i = last then
        break;
      Ctxt.W.BlockAfterItem(Ctxt.Options);
      inc(i);
    until false;
  Ctxt.W.BlockEnd(']', Ctxt.Options);
end;

procedure _JS_TRawUtf8List(Data: PRawUtf8List; const Ctxt: TJsonSaveContext);
var
  i, last: PtrInt;
  u: PPUtf8CharArray;
begin
  if Data^ = nil then
  begin
    Ctxt.W.AddNull;
    exit;
  end;
  Ctxt.W.BlockBegin('[', Ctxt.Options);
  i := 0;
  u := Data^.TextPtr;
  last := Data^.Count - 1;
  if last >= 0 then
    repeat
      Ctxt.W.Add('"');
      Ctxt.W.AddJsonEscape(u[i]);
      Ctxt.W.AddDirect('"');
      if i = last then
        break;
      Ctxt.W.BlockAfterItem(Ctxt.Options);
      inc(i);
    until false;
  Ctxt.W.BlockEnd(']', Ctxt.Options);
end;

procedure _JS_TSynList(Data: PSynList; const Ctxt: TJsonSaveContext);
begin
  if Data^ = nil then
    Ctxt.W.AddNull
  else
    _JS_Objects(Ctxt.W, pointer(Data^.List), Data^.Count, Ctxt.Options);
end;

procedure _JS_TSynObjectList(Data: PSynObjectList; const Ctxt: TJsonSaveContext);
var
  o: TTextWriterWriteObjectOptions;
begin
  if Data^ = nil then
  begin
    Ctxt.W.AddNull;
    exit;
  end;
  o := Ctxt.Options;
  if not (woObjectListWontStoreClassName in o) then
    include(o, woStoreClassName);
  _JS_Objects(Ctxt.W, pointer(Data^.List), Data^.Count, o);
end;


{ ********** TJsonWriter class with proper JSON escaping and WriteObject() support }

{ TJsonWriter }

procedure TJsonWriter.WriteObjectPropNameHumanReadable(
  PropName: PUtf8Char; PropNameLen: PtrInt);
begin
  AddCRAndIndent; // won't do anything if has already been done
  AddProp(PropName, PropNameLen); // handle twoForceJsonExtended
  Add(' ');
end;

procedure TJsonWriter.WriteObjectPropNameShort(const PropName: ShortString;
  Options: TTextWriterWriteObjectOptions);
begin
  if woHumanReadable in Options then
    WriteObjectPropNameHumanReadable(@PropName[1], ord(PropName[0]))
  else
    AddProp(@PropName[1], ord(PropName[0]));
end;

procedure TJsonWriter.WriteObjectAsString(Value: TObject;
  Options: TTextWriterWriteObjectOptions);
var
  W: TJsonWriter;
begin
  Add('"');
  W := GetTempJsonWriter;
  W.WriteObject(Value, Options);
  AddJsonEscape(W);
  Add('"');
end;

procedure TJsonWriter.AddDynArrayJsonAsString(aTypeInfo: PRttiInfo; var aValue;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  temp: TDynArray;
  W: TJsonWriter;
begin
  Add('"');
  temp.Init(aTypeInfo, aValue);
  W := GetTempJsonWriter;
  W.AddDynArrayJson(temp, WriteOptions);
  AddJsonEscape(W);
  Add('"');
end;

procedure TJsonWriter.AddCRAndIndent;
begin
  if fBlockComment <> '' then
  begin
    AddShorter(' // ');
    AddString(fBlockComment);
    fBlockComment := '';
  end;
  inherited AddCRAndIndent;
end;

procedure TJsonWriter.AddPropJsonString(const PropName: ShortString;
  const Text: RawUtf8);
begin
  AddProp(@PropName[1], ord(PropName[0]));
  AddJsonString(Text); // " + AddJsonEscape(Text) + "
  AddComma;
end;

procedure TJsonWriter.InternalAddFixedAnsi(Source: PAnsiChar; SourceChars: cardinal;
  AnsiToWide: PWordArray; Escape: TTextWriterKind);
var
  c: cardinal;
  esc: byte;
begin
  if SourceChars > 0 then
  repeat
    case Escape of // twJsonEscape or twOnSameLine only occur on c <= $7f
      twNone:
        repeat
          if B >= BEnd then
            FlushToStream;
          c := byte(Source^);
          inc(Source);
          if c > $7F then
             break;
          if c = 0 then
            exit;
          inc(B);
          B^ := AnsiChar(c);
          dec(SourceChars);
          if SourceChars = 0 then
            exit;
        until false;
      twJsonEscape:
        repeat
          if B >= BEnd then
            FlushToStream;
          c := byte(Source^);
          inc(Source);
          if c > $7F then
             break;
          if c = 0 then
            exit;
          esc := JSON_ESCAPE[c]; // c<>0 -> esc<>JSON_ESCAPE_ENDINGZERO
          if esc = JSON_ESCAPE_NONE then
          begin
            // no escape needed
            inc(B);
            B^ := AnsiChar(c);
          end
          else if esc = JSON_ESCAPE_UNICODEHEX then
          begin
            // characters below ' ', #7 e.g. -> \u0007
            AddShorter('\u00');
            AddByteToHex(c);
          end
          else
            Add('\', AnsiChar(esc)); // escaped as \ + b,t,n,f,r,\,"
          dec(SourceChars);
          if SourceChars = 0 then
            exit;
        until false;
    else  //twOnSameLine:
      repeat
        if B >= BEnd then
          FlushToStream;
        c := byte(Source^);
        inc(Source);
        if c > $7F then
           break;
        if c = 0 then
          exit;
        inc(B);
        if c < 32 then
          B^ := ' ' // on same line
        else
          B^ := AnsiChar(c);
        dec(SourceChars);
        if SourceChars = 0 then
          exit;
      until false;
    end;
    // handle c > $7F (no surrogate is expected in TSynAnsiFixedWidth charsets)
    c := AnsiToWide[c]; // convert FixedAnsi char into Unicode char
    if c > $7ff then
    begin
      B[1] := AnsiChar($E0 or (c shr 12));
      B[2] := AnsiChar($80 or ((c shr 6) and $3F));
      B[3] := AnsiChar($80 or (c and $3F));
      inc(B, 3);
    end
    else
    begin
      B[1] := AnsiChar($C0 or (c shr 6));
      B[2] := AnsiChar($80 or (c and $3F));
      inc(B, 2);
    end;
    dec(SourceChars);
  until SourceChars = 0;
end;

destructor TJsonWriter.Destroy;
begin
  inherited Destroy;
  fInternalJsonWriter.Free;
end;

function TJsonWriter.GetTempJsonWriter: TJsonWriter;
begin
  if fInternalJsonWriter = nil then
    fInternalJsonWriter := TJsonWriter.CreateOwnedStream(4096, {noshare=}true)
  else
    fInternalJsonWriter.CancelAllAsNew;
  result := fInternalJsonWriter;
end;

procedure TJsonWriter.Add(P: PUtf8Char; Escape: TTextWriterKind);
begin
  if P <> nil then
    case Escape of
      twNone:
        AddNoJsonEscape(P, StrLen(P));
      twJsonEscape:
        AddJsonEscape(P);
      twOnSameLine:
        AddOnSameLine(P);
    end;
end;

procedure TJsonWriter.Add(P: PUtf8Char; Len: PtrInt; Escape: TTextWriterKind);
begin
  if P <> nil then
    case Escape of
      twNone:
        AddNoJsonEscape(P, Len);
      twJsonEscape:
        AddJsonEscape(P, Len);
      twOnSameLine:
        AddOnSameLine(P, Len);
    end;
end;

procedure TJsonWriter.AddW(P: PWord; Len: PtrInt; Escape: TTextWriterKind);
begin
  if P <> nil then
    case Escape of
      twNone:
        AddNoJsonEscapeW(P, Len);
      twJsonEscape:
        AddJsonEscapeW(P, Len);
      twOnSameLine:
        AddOnSameLineW(P, Len);
    end;
end;

procedure TJsonWriter.AddAnsiString(const s: AnsiString; Escape: TTextWriterKind);
begin
  AddAnyAnsiBuffer(pointer(s), length(s), Escape, 0);
end;

procedure TJsonWriter.AddAnyAnsiString(const s: RawByteString;
  Escape: TTextWriterKind; CodePage: integer);
var
  L: integer;
begin
  L := length(s);
  if L = 0 then
    exit;
  if (L > 2) and
     (PInteger(s)^ and $ffffff = JSON_BASE64_MAGIC_C) then
  begin
    AddNoJsonEscape(pointer(s), L); // was marked as a BLOB content
    exit;
  end;
  if CodePage < 0 then
    {$ifdef HASCODEPAGE}
    CodePage := GetCodePage(s);
    {$else}
    CodePage := CP_ACP; // TSynAnsiConvert.Engine(0)=CurrentAnsiConvert
    {$endif HASCODEPAGE}
  AddAnyAnsiBuffer(pointer(s), L, Escape, CodePage);
end;

procedure EngineAppendUtf8(W: TJsonWriter; Engine: TSynAnsiConvert;
  P: PAnsiChar; Len: PtrInt; Escape: TTextWriterKind);
var
  tmp: TSynTempBuffer;
begin
  // explicit conversion using a temporary UTF-16 buffer on stack
  Engine.AnsiBufferToUnicode(tmp.Init(Len * 3), P, Len); // includes ending #0
  W.AddW(tmp.buf, 0, Escape);
  tmp.Done;
end;

procedure TJsonWriter.AddAnyAnsiBuffer(P: PAnsiChar; Len: PtrInt;
  Escape: TTextWriterKind; CodePage: integer);
var
  B: PUtf8Char;
  engine: TSynAnsiConvert;
label
  utf8;
begin
  if (P = nil) or
     (Len <= 0) then
    exit;
  if CodePage = CP_ACP then // CP_UTF8 is very likely on POSIX or LCL
    CodePage := Unicode_CodePage; // = CurrentAnsiConvert.CodePage
  case CodePage of
    CP_UTF8:          // direct write of RawUtf8 content
      begin
        if Escape = twJsonEscape then
          Len := 0;    // faster with no Len
utf8:   Add(PUtf8Char(P), Len, Escape);
      end;
    CP_RAWBYTESTRING: // direct write of RawByteString content as UTF-8
      goto utf8;
    CP_UTF16:         // direct write of UTF-16 content
      AddW(PWord(P), 0, Escape);
    CP_RAWBLOB:       // RawBlob written with Base64 encoding
      begin
        AddShorter(JSON_BASE64_MAGIC_S); // \uFFF0
        WrBase64(P, Len, {withMagic=}false);
      end;
  else
    begin
      // first handle trailing 7-bit ASCII chars, by quad
      B := pointer(P);
      if Len >= 4 then
        repeat
          if PCardinal(P)^ and $80808080 <> 0 then
            break; // break on first non ASCII quad
          inc(P, 4);
          dec(Len, 4);
        until Len < 4;
      if (Len > 0) and
         (P^ <= #127) then
        repeat
          inc(P);
          dec(Len);
        until (Len = 0) or
              (P^ > #127);
      if P <> pointer(B) then
        Add(B, P - B, Escape);
      if Len <= 0 then
        exit;
      // rely on explicit conversion for all remaining ASCII characters
      engine := TSynAnsiConvert.Engine(CodePage);
      if PClass(engine)^ = TSynAnsiFixedWidth then
        InternalAddFixedAnsi(P, Len,
          pointer(TSynAnsiFixedWidth(engine).AnsiToWide), Escape)
      else
        EngineAppendUtf8(self, engine, P, Len, Escape);
    end;
  end;
end;

procedure TJsonWriter.WrBase64(P: PAnsiChar; Len: PtrUInt; withMagic: boolean);
var
  trailing, main, n: PtrUInt;
begin
  if P = nil then
    Len := 0;
  if withMagic then
    if Len <= 0 then
    begin
      AddNull; // JSON null is better than "" for BLOBs
      exit;
    end
    else
      AddShorter(JSON_BASE64_MAGIC_QUOTE_S); // "\uFFF0
  if Len > 0 then
  begin
    n := Len div 3;
    trailing := Len - n * 3;
    dec(Len, trailing);
    if BEnd - B > integer(n + 1) shl 2 then
    begin
      // will fit in available space in Buf -> fast in-buffer Base64 encoding
      n := Base64EncodeMain(@B[1], P, Len); // may use AVX2 on FPC x86_64
      inc(B, n * 4);
      inc(P, n * 3);
    end
    else
    begin
      // bigger than available space in Buf -> do it per chunk
      FlushToStream;
      while Len > 0 do
      begin
        n := ((fTempBufSize - 4) shr 2) * 3;
        if Len < n then
          n := Len;
        main := Base64EncodeMain(PAnsiChar(fTempBuf), P, n);
        n := main * 4;
        if n < cardinal(fTempBufSize) - 4 then
          inc(B, n)
        else
          WriteToStream(fTempBuf, n);
        n := main * 3;
        inc(P, n);
        dec(Len, n);
      end;
    end;
    if trailing > 0 then
    begin
      Base64EncodeTrailing(@B[1], P, trailing);
      inc(B, 4);
    end;
  end;
  if withMagic then
    Add('"');
end;

procedure TJsonWriter.BinarySaveBase64(Data: pointer; Info: PRttiInfo;
  Kinds: TRttiKinds; withMagic, withCrc: boolean);
var
  temp: TSynTempBuffer;
begin
  BinarySave(Data, temp, Info, Kinds, withCrc);
  WrBase64(temp.buf, temp.len, withMagic);
  temp.Done;
end;

procedure TJsonWriter.Add(const Format: RawUtf8; const Values: array of const;
  Escape: TTextWriterKind; WriteObjectOptions: TTextWriterWriteObjectOptions);
var
  ValuesIndex: integer;
  S, F: PUtf8Char;
begin
  if Format = '' then
    exit;
  if (Format = '%') and
     (high(Values) >= 0) then
  begin
    Add(Values[0], Escape);
    exit;
  end;
  ValuesIndex := 0;
  F := pointer(Format);
  repeat
    S := F;
    repeat
      if (F^ = #0) or
         (F^ = '%') then
        break;
      inc(F);
    until false;
    AddNoJsonEscape(S, F - S);
    if F^ = #0 then
      exit;
    // add next value as text instead of F^='%' placeholder
    if ValuesIndex <= high(Values) then // missing value will display nothing
      Add(Values[ValuesIndex], Escape, WriteObjectOptions);
    inc(F);
    inc(ValuesIndex);
  until false;
end;

procedure TJsonWriter.AddCsvUtf8(const Values: array of RawUtf8);
var
  i: PtrInt;
begin
  if length(Values) = 0 then
    exit;
  for i := 0 to high(Values) do
  begin
    Add('"');
    AddJsonEscape(pointer(Values[i]));
    AddDirect('"', ',');
  end;
  CancelLastComma;
end;

procedure TJsonWriter.AddCsvConst(const Values: array of const);
var
  i: PtrInt;
begin
  if length(Values) = 0 then
    exit;
  for i := 0 to high(Values) do
  begin
    AddJsonEscape(Values[i]);
    AddComma;
  end;
  CancelLastComma;
end;

procedure TJsonWriter.Add(const Values: array of const);
var
  i: PtrInt;
begin
  for i := 0 to high(Values) do
    AddJsonEscape(Values[i]);
end;

procedure TJsonWriter.Add(const Values: array of const; Escape: TTextWriterKind);
var
  i: PtrInt;
begin
  for i := 0 to high(Values) do
    Add(Values[i], Escape);
end;

procedure TJsonWriter.AddQuotedStringAsJson(const QuotedString: RawUtf8);
var
  L: integer;
  P, B: PUtf8Char;
  quote: AnsiChar;
begin
  L := length(QuotedString);
  if L = 0 then
    exit;
  quote := QuotedString[1];
  if (quote in ['''', '"']) and
     (QuotedString[L] = quote) then
  begin
    Add('"');
    P := pointer(QuotedString);
    inc(P);
    repeat
      B := P;
      while P[0] <> quote do
        inc(P);
      if P[1] <> quote then
        break; // end quote
      inc(P);
      AddJsonEscape(B, P - B);
      inc(P); // ignore double quote
    until false;
    if P - B <> 0 then
      AddJsonEscape(B, P - B);
    Add('"');
  end
  else // was not a quoted string
    AddNoJsonEscape(pointer(QuotedString), length(QuotedString));
end;

procedure TJsonWriter.AddVariant(const Value: variant; Escape: TTextWriterKind;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  cv: TSynInvokeableVariantType;
  v: PVarData;
  vt: cardinal;
  save: TRttiJsonSave;
begin
  v := @Value;
  repeat
    vt := v^.VType;
    if vt <> varVariantByRef then
      break;
    v := v^.VPointer;
  until false;
  if vt <= high(VARIANT_JSONSAVE) then
  begin
    ctxt.W := self;
    ctxt.Options := WriteOptions; // other fields are just ignored
    save := VARIANT_JSONSAVE[vt];
    if Assigned(save) then
    begin
      save(@v^.VAny, ctxt);
      exit;
    end;
  end;
  if vt = varString then
    AddText(RawByteString(v^.VString), Escape)
  else
  case vt of
    varOleStr {$ifdef HASVARUSTRING}, varUString{$endif}:
      AddTextW(v^.VAny, Escape);
    varAny:
      // rkEnumeration,rkSet,rkDynArray,rkClass,rkInterface,rkRecord,rkObject
      // from TRttiCustomProp.GetValueDirect/GetValueGetter
      AddRttiVarData(PRttiVarData(v)^, Escape, WriteOptions);
    varVariantByRef:
      AddVariant(PVariant(v^.VPointer)^, Escape, WriteOptions);
    varStringByRef:
      AddText(PRawByteString(v^.VAny)^, Escape);
    {$ifdef HASVARUSTRING} varUStringByRef, {$endif}
    varOleStrByRef:
      AddTextW(PPointer(v^.VAny)^, Escape)
  else
    begin
      cv := FindSynVariantType(vt); // our custom types
      if cv <> nil then
        cv.ToJson(self, v)
      else if not CustomVariantToJson(self, v, Escape) then // other custom
        raise EJsonException.CreateUtf8('%.AddVariant VType=%', [self, vt]);
    end;
  end;
end;

procedure TJsonWriter.AddTypedJson(Value, TypeInfo: pointer;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  save: TRttiJsonSave;
begin
  {%H-}ctxt.Init(self, WriteOptions, Rtti.RegisterType(TypeInfo));
  if ctxt.Info <> nil then
  begin
    save := ctxt.Info.JsonSave;
    if Assigned(save) then
      save(Value, ctxt)
    else
      BinarySaveBase64(Value, TypeInfo, rkRecordTypes, {withMagic=}true);
  end
  else
    AddNull; // paranoid check
end;

procedure TJsonWriter.WriteObject(Value: TObject;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  save: TRttiJsonSave;
begin
  if Value <> nil then
  begin
    // Rtti.RegisterClass() may create fake RTTI if {$M+} was not used
    {%H-}ctxt.Init(self, WriteOptions, Rtti.RegisterClass(PClass(Value)^));
    save := ctxt.Info.JsonSave;
    if Assigned(save) then
    begin
      save(@Value, ctxt);
      exit;
    end;
  end;
  AddNull;
end;

procedure TJsonWriter.AddRttiCustomJson(Value: pointer; RttiCustom: TObject;
  Escape: TTextWriterKind; WriteOptions: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  save: TRttiJsonSave;
begin
  {%H-}ctxt.Init(self, WriteOptions, TRttiCustom(RttiCustom));
  save := ctxt.Info.JsonSave;
  if Assigned(save) then
    save(Value, ctxt)
  else
    BinarySaveBase64(Value, ctxt.Info.Info, rkAllTypes,
      {magic=}Escape <> twOnSameLine);
end;

procedure TJsonWriter.AddRttiVarData(const Value: TRttiVarData;
  Escape: TTextWriterKind; WriteOptions: TTextWriterWriteObjectOptions);
var
  V64: Int64;
begin
  if Value.PropValueIsInstance then
  begin
    // from TRttiCustomProp.GetValueGetter
    if rcfGetOrdProp in Value.Prop.Value.Cache.Flags then
    begin
      // rkEnumeration,rkSet,rkDynArray,rkClass,rkInterface
      V64 := Value.Prop.Prop.GetOrdProp(Value.PropValue);
      AddRttiCustomJson(@V64, Value.Prop.Value, Escape, WriteOptions);
    end
    else
      // rkRecord,rkObject have no getter methods
      raise EJsonException.CreateUtf8('%.AddRttiVarData: unsupported % (%)',
        [self, Value.Prop.Value.Name, ToText(Value.Prop.Value.Kind)^]);
  end
  else
    // from TRttiCustomProp.GetValueDirect
    AddRttiCustomJson(Value.PropValue, Value.Prop.Value, Escape, WriteOptions);
end;

procedure TJsonWriter.AddText(const Text: RawByteString; Escape: TTextWriterKind);
begin
  if Escape = twJsonEscape then
    Add('"');
  {$ifdef HASCODEPAGE}
  AddAnyAnsiString(Text, Escape);
  {$else}
  Add(pointer(Text), length(Text), Escape);
  {$endif HASCODEPAGE}
  if Escape <> twJsonEscape then
    exit;
  B[1] := '"';
  inc(B);
end;

procedure TJsonWriter.AddTextW(P: PWord; Escape: TTextWriterKind);
begin
  if Escape = twJsonEscape then
    Add('"');
  AddW(P, 0, Escape);
  if Escape <> twJsonEscape then
    exit;
  B[1] := '"';
  inc(B);
end;

function TJsonWriter.AddJsonReformat(Json: PUtf8Char; Format: TTextWriterJsonFormat;
 EndOfObject: PUtf8Char): PUtf8Char;
var
  objEnd: AnsiChar;
  Name, Value: PUtf8Char;
  NameLen: integer;
  ValueLen: PtrInt;
  tab: PJsonCharSet;
begin
  result := nil;
  if Json = nil then
    exit;
  while (Json^ <= ' ') and
        (Json^ <> #0) do
    inc(Json);
  case Json^ of
    '[':
      begin
        // array
        repeat
          inc(Json)
        until (Json^ = #0) or
              (Json^ > ' ');
        if Json^ = ']' then
        begin
          Add('[');
          inc(Json);
        end
        else
        begin
          if Format in [jsonHumanReadable, jsonUnquotedPropName] then
            AddCRAndIndent;
          inc(fHumanReadableLevel);
          Add('[');
          repeat
            if Json = nil then
              exit;
            if Format in [jsonHumanReadable, jsonUnquotedPropName] then
              AddCRAndIndent;
            Json := AddJsonReformat(Json, Format, @objEnd);
            if objEnd = ']' then
              break;
            AddDirect(objEnd);
          until false;
          dec(fHumanReadableLevel);
          if Format in [jsonHumanReadable, jsonUnquotedPropName] then
            AddCRAndIndent;
        end;
        AddDirect(']');
      end;
    '{':
      begin
        // object
        repeat
          inc(Json)
        until (Json^ = #0) or
              (Json^ > ' ');
        Add('{');
        inc(fHumanReadableLevel);
        if Format in [jsonHumanReadable, jsonUnquotedPropName] then
          AddCRAndIndent;
        if Json^ = '}' then
          repeat
            inc(Json)
          until (Json^ = #0) or
                (Json^ > ' ')
        else
          repeat
            // processs property name
            Name := GetJsonPropName(Json, @NameLen, {nounescape=}true);
            if Name = nil then
              exit;
            if (Format in [jsonUnquotedPropName, jsonUnquotedPropNameCompact]) and
               JsonPropNameValid(Name) then
              AddNoJsonEscape(Name, NameLen)
            else
            begin
              AddDirect('"');
              if Format < jsonEscapeUnicode then
                AddNoJsonEscape(Name, NameLen)
              else if Format = jsonNoEscapeUnicode then
                AddNoJsonEscapeForcedNoUnicode(Name, NameLen)
              else
                AddNoJsonEscapeForcedUnicode(Name, NameLen);
              AddDirect('"');
            end;
            if Format in [jsonHumanReadable, jsonUnquotedPropName] then
              AddDirect(':', ' ')
            else
              AddDirect(':');
            // recurcisvely process value
            while (Json^ <= ' ') and
                  (Json^ <> #0) do
              inc(Json);
            Json := AddJsonReformat(Json, Format, @objEnd);
            if objEnd = '}' then
              break;
            Add(objEnd);
            if Format in [jsonHumanReadable, jsonUnquotedPropName] then
              AddCRAndIndent;
          until false;
        dec(fHumanReadableLevel);
        if Format in [jsonHumanReadable, jsonUnquotedPropName] then
          AddCRAndIndent;
        AddDirect('}');
      end;
    '"':
      begin
        // string
        Value := Json;
        Json := GotoEndOfJsonString2(Json + 1, @JSON_CHARS);
        if Json^ <> '"' then
          exit;
        inc(Json);
        if Format < jsonEscapeUnicode then
          AddNoJsonEscape(Value, Json - Value)
        else if Format = jsonNoEscapeUnicode then
          AddNoJsonEscapeForcedNoUnicode(Value, Json - Value)
        else
          AddNoJsonEscapeForcedUnicode(Value, Json - Value);
      end;
  else
    begin
      // numeric value or true/false/null constant or MongoDB extended
      tab := @JSON_CHARS;
      if jcEndOfJsonFieldOr0 in tab[Json^] then
        exit; // #0 , ] } :
      Value := Json;
      ValueLen := 0;
      repeat
        inc(ValueLen);
      until jcEndOfJsonFieldOr0 in tab[Json[ValueLen]];
      inc(Json, ValueLen);
      while (ValueLen > 0) and
            (Value[ValueLen - 1] <= ' ') do
        dec(ValueLen);
      AddShort(Value, ValueLen);
    end;
  end;
  if Json = nil then
    exit;
  while (Json^ <= ' ') and
        (Json^ <> #0) do
    inc(Json);
  if EndOfObject <> nil then
    EndOfObject^ := Json^;
  if Json^ <> #0 then
    repeat
      inc(Json)
    until (Json^ = #0) or
          (Json^ > ' ');
  result := Json;
end;

function TJsonWriter.AddJsonToXML(Json: PUtf8Char;
  ArrayName, EndOfObject: PUtf8Char): PUtf8Char;
var
  info: TGetJsonField;
  Name: PUtf8Char;
  n, c: integer;
begin
  result := nil;
  if Json = nil then
    exit;
  while (Json^ <= ' ') and
        (Json^ <> #0) do
    inc(Json);
  if Json^ = '/' then
    Json := TryGotoEndOfComment(Json);
  case Json^ of
  '[':
    begin
      repeat
        inc(Json);
      until (Json^ = #0) or
            (Json^ > ' ');
      if Json^ = ']' then
        Json := GotoNextNotSpace(Json + 1)
      else
      begin
        n := 0;
        repeat
          if Json = nil then
            exit;
          Add('<');
          if ArrayName = nil then
            Add(n)
          else
            AddXmlEscape(ArrayName);
          Add('>');
          Json := AddJsonToXML(Json, nil, @info.EndOfObject);
          Add('<', '/');
          if ArrayName = nil then
            Add(n)
          else
            AddXmlEscape(ArrayName);
          Add('>');
          inc(n);
        until info.EndOfObject = ']';
      end;
    end;
  '{':
    begin
      repeat
        inc(Json);
      until (Json^ = #0) or
            (Json^ > ' ');
      if Json^ = '}' then
        Json := GotoNextNotSpace(Json + 1)
      else
      begin
        repeat
          Name := GetJsonPropName(Json);
          if Name = nil then
            exit;
          while (Json^ <= ' ') and
                (Json^ <> #0) do
            inc(Json);
          if Json^ = '[' then // arrays are written as list of items, without root
            Json := AddJsonToXML(Json, Name, @info.EndOfObject)
          else
          begin
            Add('<');
            AddXmlEscape(Name);
            Add('>');
            Json := AddJsonToXML(Json, Name, @info.EndOfObject);
            Add('<', '/');
            AddXmlEscape(Name);
            Add('>');
          end;
        until info.EndOfObject = '}';
      end;
    end;
  else
    begin // unescape the JSON content and write as UTF-8 escaped XML
      info.Json := Json;
      info.GetJsonField;
      if info.Value = nil then
        AddNull
      else
      begin
        c := PInteger(info.Value)^ and $ffffff;
        if (c = JSON_BASE64_MAGIC_C) or
           (c = JSON_SQLDATE_MAGIC_C) then
          inc(info.Value, 3); // ignore the Magic codepoint encoded as UTF-8
        AddXmlEscape(info.Value);
      end;
      if EndOfObject <> nil then
        EndOfObject^ := info.EndOfObject;
      result := info.Json;
      exit;
    end;
  end;
  if Json <> nil then
  begin
    while (Json^ <= ' ') and
          (Json^ <> #0) do
      inc(Json);
    if EndOfObject <> nil then
      EndOfObject^ := Json^;
    if Json^ <> #0 then
      repeat
        inc(Json);
      until (Json^ = #0) or
            (Json^ > ' ');
  end;
  result := Json;
end;

procedure TJsonWriter.AddJsonEscape(P: Pointer; Len: PtrInt);
var
  i, start: PtrInt;
  {$ifdef CPUX86NOTPIC}
  tab: TNormTableByte absolute JSON_ESCAPE;
  {$else}
  tab: PByteArray;
  {$endif CPUX86NOTPIC}
label
  noesc;
begin
  if P = nil then
    exit;
  if Len = 0 then
    dec(Len); // -1 = no end = AddJsonEscape(P, 0)
  i := 0;
  {$ifndef CPUX86NOTPIC}
  tab := @JSON_ESCAPE;
  {$endif CPUX86NOTPIC}
  if tab[PByteArray(P)[i]] = JSON_ESCAPE_NONE then
  begin
noesc:
    start := i;
    if Len < 0 then  // fastest loop is with AddJsonEscape(P, 0)
      repeat
        inc(i);
      until tab[PByteArray(P)[i]] <> JSON_ESCAPE_NONE
    else
      repeat
        inc(i);
      until (i >= Len) or
            (tab[PByteArray(P)[i]] <> JSON_ESCAPE_NONE);
    inc(PByte(P), start);
    dec(i, start);
    if Len >= 0 then
      dec(Len, start);
    if BEnd - B <= i then
      AddNoJsonEscapeBig(P, i)
    else
    begin
      MoveFast(P^, B[1], i);
      inc(B, i);
    end;
    if (Len >= 0) and
       (i >= Len) then
      exit;
  end;
  repeat
    if B >= BEnd then
      FlushToStream;
    case tab[PByteArray(P)[i]] of // better codegen with no temp var
      JSON_ESCAPE_NONE:
        goto noesc;
      JSON_ESCAPE_ENDINGZERO:
        // #0
        exit;
      JSON_ESCAPE_UNICODEHEX:
        begin
          // characters below ' ', #7 e.g. -> // 'u0007'
          PCardinal(B + 1)^ :=
            ord('\') + ord('u') shl 8 + ord('0') shl 16 + ord('0') shl 24;
          inc(B, 4);
          PWord(B + 1)^ := TwoDigitsHexWB[PByteArray(P)[i]];
        end;
    else
      // escaped as \ + b,t,n,f,r,\,"
      PWord(B + 1)^ := (integer(tab[PByteArray(P)[i]]) shl 8) or ord('\');
    end;
    inc(i);
    inc(B, 2);
  until (Len >= 0) and
        (i >= Len);
end;

procedure TJsonWriter.AddJsonEscapeString(const s: string);
begin
  if s <> '' then
    {$ifdef UNICODE}
    AddJsonEscapeW(pointer(s), Length(s));
    {$else}
    AddAnyAnsiString(s, twJsonEscape, 0);
    {$endif UNICODE}
end;

procedure TJsonWriter.AddJsonEscapeAnsiString(const s: AnsiString);
begin
  AddAnyAnsiString(s, twJsonEscape, 0);
end;

procedure TJsonWriter.AddJsonEscapeW(P: PWord; Len: PtrInt);
var
  i, c, s: PtrInt;
  esc: byte;
  tab: PByteArray;
begin
  if P = nil then
    exit;
  if Len = 0 then
    Len := MaxInt;
  i := 0;
  while i < Len do
  begin
    s := i;
    tab := @JSON_ESCAPE;
    repeat
      c := PWordArray(P)[i];
      if (c <= 127) and
         (tab[c] <> JSON_ESCAPE_NONE) then
        break;
      inc(i);
    until i >= Len;
    if i <> s then
      AddNoJsonEscapeW(@PWordArray(P)[s], i - s);
    if i >= Len then
      exit;
    c := PWordArray(P)[i];
    if c = 0 then
      exit;
    esc := tab[c];
    if esc = JSON_ESCAPE_ENDINGZERO then // #0
      exit
    else if esc = JSON_ESCAPE_UNICODEHEX then
    begin
      // characters below ' ', #7 e.g. -> \u0007
      AddShorter('\u00');
      AddByteToHex(c);
    end
    else
      Add('\', AnsiChar(esc)); // escaped as \ + b,t,n,f,r,\,"
    inc(i);
  end;
end;

procedure TJsonWriter.AddJsonEscape(const V: TVarRec);
begin
  with V do
    case VType of
      vtPointer:
        AddNull;
      vtString,
      vtAnsiString,
      {$ifdef HASVARUSTRING}vtUnicodeString, {$endif}
      vtPChar,
      vtChar,
      vtWideChar,
      vtWideString,
      vtClass:
        begin
          Add('"');
          case VType of
            vtString:
              if (VString <> nil) and
                 (VString^[0] <> #0) then
                AddJsonEscape(@VString^[1], ord(VString^[0]));
            vtAnsiString:
              AddJsonEscape(VAnsiString);
            {$ifdef HASVARUSTRING}
            vtUnicodeString:
              AddJsonEscapeW(pointer(UnicodeString(VUnicodeString)),
                              length(UnicodeString(VUnicodeString)));
            {$endif HASVARUSTRING}
            vtPChar:
              AddJsonEscape(VPChar);
            vtChar:
              AddJsonEscape(@VChar, 1);
            vtWideChar:
              AddJsonEscapeW(@VWideChar, 1);
            vtWideString:
              AddJsonEscapeW(VWideString);
            vtClass:
              AddClassName(VClass);
          end;
          AddDirect('"');
        end;
      vtBoolean:
        Add(VBoolean); // 'true'/'false'
      vtInteger:
        Add(VInteger);
      vtInt64:
        Add(VInt64^);
      {$ifdef FPC}
      vtQWord:
        AddQ(V.VQWord^);
      {$endif FPC}
      vtExtended:
        AddDouble(VExtended^);
      vtCurrency:
        AddCurr64(VInt64);
      vtObject:
        WriteObject(VObject);
      vtVariant:
        AddVariant(VVariant^, twJsonEscape);
    end;
end;

procedure TJsonWriter.AddJsonEscape(Source: TJsonWriter);
begin
  if Source.fTotalFileSize = 0 then
    AddJsonEscape(Source.fTempBuf, Source.B - Source.fTempBuf + 1)
  else
    AddJsonEscape(Pointer(Source.Text));
end;

procedure TJsonWriter.AddNoJsonEscape(Source: TJsonWriter);
begin
  if Source.fTotalFileSize = 0 then
    AddNoJsonEscape(Source.fTempBuf, Source.B - Source.fTempBuf + 1)
  else
    AddNoJsonEscapeUtf8(Source.Text);
end;

procedure TJsonWriter.AddNoJsonEscapeForcedUnicode(P: PUtf8Char; Len: PtrInt);
var
  S, P2: PUtf8Char;
  c: cardinal;
  tab: PByteToWord;
label
  nxt;
begin
  if Len > 0 then
  repeat
    // handle 7-bit ASCII chars, by quad if possible
    S := P;
    if Len >= 4 then
      repeat
        if PCardinal(S)^ and $80808080 <> 0 then
          break; // break on first non ASCII quad
        inc(S, 4);
        dec(Len, 4);
      until Len < 4;
    if (Len > 0) and
       (S^ <= #127) then // some 1..3 trailing ASCII chars
      repeat
        inc(S);
        dec(Len);
      until (Len = 0) or
            (S^ > #127);
    P2 := P;
    P := S;
    dec(S, PtrUInt(P2));
    if S <> nil then
      AddNoJsonEscape(P2, PtrUInt(S));
nxt:if Len = 0 then
      exit;
    // some characters needs UTF-16 \u#### Unicode encoding
    if B >= BEnd then
      FlushToStream;
    P2 := P;
    c := UTF8_TABLE.GetHighUtf8Ucs4(P);
    dec(Len, P - P2);
    if (Len < 0) or
       (c = 0) then
      break;
    tab := @TwoDigitsHexWBLower;
    if c <= $ffff then
      Utf16ToJsonUnicodeEscape(B, c, tab)
    else
    begin
      dec(c, $10000); // store as UTF-16 surrogates
      Utf16ToJsonUnicodeEscape(B, (c shr 10) or UTF16_HISURROGATE_MIN, tab);
      Utf16ToJsonUnicodeEscape(B, (c and $3FF) or UTF16_LOSURROGATE_MIN, tab);
    end;
    if P^ > #127 then
      goto nxt;
  until false;
end;

procedure TJsonWriter.AddNoJsonEscapeForcedNoUnicode(P: PUtf8Char; Len: PtrInt);
var
  P2: PUtf8Char;
begin
  if Len > 0 then
  repeat
    P2 := P;
    repeat
      if P^ <> '\' then // quickly search for \### escape marker
      begin
        inc(P);
        dec(Len);
        if Len = 0 then
          break;
        continue;
      end;
      if P[1] = 'u' then // found a \u#### pattern
        break;
      inc(P, 2); // ignore this \# two-chars escape block
      dec(Len, 2);
      if Len = 0 then
        break;
      if Len < 0 then
        exit;
    until false;
    if P <> P2 then
      AddNoJsonEscape(P2, P - P2);
    if Len <= 0 then
      exit;
    // some characters needs UTF-16 \u#### Unicode decoding
    if B >= BEnd then
      FlushToStream;
    P2 := P;
    inc(P); // P^ should point at 'u1234' just after \u1234
    inc(B);
    P := JsonUnicodeEscapeToUtf8(B, P); // decode up to two UTF-16 surrogates
    dec(B);
    dec(Len, P - P2);
  until Len <= 0;
end;

procedure TJsonWriter.AddJsonString(const Text: RawUtf8);
begin
  Add('"');
  AddJsonEscape(pointer(Text));
  B[1] := '"';
  inc(B);
end;

procedure TJsonWriter.Add(const V: TVarRec; Escape: TTextWriterKind;
  WriteObjectOptions: TTextWriterWriteObjectOptions);
begin
  with V do
    case VType of
      vtInteger:
        Add(VInteger);
      vtBoolean:
        if VBoolean then // normalize
          Add('1')
        else
          Add('0');
      vtChar:
        Add(@VChar, 1, Escape);
      vtExtended:
        AddDouble(VExtended^);
      vtCurrency:
        AddCurr64(VInt64);
      vtInt64:
        Add(VInt64^);
      {$ifdef FPC}
      vtQWord:
        AddQ(VQWord^);
      {$endif FPC}
      vtVariant:
        AddVariant(VVariant^, Escape);
      vtString:
        if (VString <> nil) and
           (VString^[0] <> #0) then
          Add(@VString^[1], ord(VString^[0]), Escape);
      vtInterface,
      vtPointer:
        AddPointer(PtrUInt(VPointer));
      vtPChar:
        Add(PUtf8Char(VPChar), Escape);
      vtObject:
        WriteObject(VObject, WriteObjectOptions);
      vtClass:
        AddClassName(VClass);
      vtWideChar:
        AddW(@VWideChar, 1, Escape);
      vtPWideChar:
        AddW(pointer(VPWideChar), StrLenW(VPWideChar), Escape);
      vtAnsiString:
        if VAnsiString <> nil then // expect RawUtf8
          Add(VAnsiString, length(RawUtf8(VAnsiString)), Escape);
      vtWideString:
        if VWideString <> nil then
          AddW(VWideString, length(WideString(VWideString)), Escape);
      {$ifdef HASVARUSTRING}
      vtUnicodeString:
        if VUnicodeString <> nil then // convert to UTF-8
          AddW(VUnicodeString, length(UnicodeString(VUnicodeString)), Escape);
      {$endif HASVARUSTRING}
    end;
end;

procedure TJsonWriter.AddJson(const Format: RawUtf8; const Args, Params: array of const);
var
  temp: variant;
begin
  _JsonFmt(Format, Args, Params, JSON_FAST, temp);
  AddVariant(temp, twJsonEscape);
end;

procedure TJsonWriter.AddJsonArraysAsJsonObject(keys, values: PUtf8Char);
var
  k, v: PUtf8Char;
  parser: TJsonGotoEndParser;
begin
  if (keys = nil) or
     (keys[0] <> '[') or
     (values = nil) or
     (values[0] <> '[') or
     (keys[1] = ']') or
     (values[1] = ']') then
  begin
    AddNull;
    exit;
  end;
  inc(keys); // jump initial [
  inc(values);
  Add('{');
  {%H-}parser.Init({strict=}false, nil);
  repeat
    k := parser.GotoEnd(keys);
    v := parser.GotoEnd(values);
    if (k = nil) or
       (v = nil) then
      break; // invalid JSON input
    AddNoJsonEscape(keys, k - keys);
    AddDirect(':');
    AddNoJsonEscape(values, v - values);
    AddComma;
    if (k^ <> ',') or
       (v^ <> ',') then
      break; // reached the end of the input JSON arrays
    keys := k + 1;
    values := v + 1;
  until false;
  CancelLastComma('}');
end;

procedure TJsonWriter.AddJsonEscape(const NameValuePairs: array of const);
var
  a: integer;

  procedure WriteValue;
  begin
    case VarRecAsChar(NameValuePairs[a]) of
      ord('['):
        begin
          Add('[');
          while a < high(NameValuePairs) do
          begin
            inc(a);
            if VarRecAsChar(NameValuePairs[a]) = ord(']') then
              break;
            WriteValue;
          end;
          CancelLastComma(']');
        end;
      ord('{'):
        begin
          Add('{');
          while a < high(NameValuePairs) do
          begin
            inc(a);
            if VarRecAsChar(NameValuePairs[a]) = ord('}') then
              break;
            AddJsonEscape(NameValuePairs[a]);
            Add(':');
            inc(a);
            WriteValue;
          end;
          CancelLastComma('}');
        end
    else
      AddJsonEscape(NameValuePairs[a]);
    end;
    AddComma;
  end;

begin
  Add('{');
  a := 0;
  while a < high(NameValuePairs) do
  begin
    AddJsonEscape(NameValuePairs[a]);
    inc(a);
    AddDirect(':');
    WriteValue;
    inc(a);
  end;
  CancelLastComma('}');
end;

function TJsonWriter.AddRecordJson(Value: pointer; RecordInfo: PRttiInfo;
  WriteOptions: TTextWriterWriteObjectOptions): PtrInt;
var
  ctxt: TJsonSaveContext;
begin
  {%H-}ctxt.Init(self, WriteOptions, Rtti.RegisterType(RecordInfo));
  if rcfHasNestedProperties in ctxt.Info.Flags then
    // we know the fields from text definition
    TRttiJsonSave(ctxt.Info.JsonSave)(Value, ctxt)
  else
    // fallback to binary serialization, trailing crc32c and Base64 encoding
    BinarySaveBase64(Value, RecordInfo, rkRecordTypes, {magic=}true);
  result := ctxt.Info.Size;
end;

procedure TJsonWriter.AddVoidRecordJson(RecordInfo: PRttiInfo;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  tmp: TSynTempBuffer;
begin
  tmp.InitZero(RecordInfo.RecordSize);
  AddRecordJson(tmp.buf, RecordInfo, WriteOptions);
  tmp.Done;
end;

procedure TJsonWriter.AddDynArrayJson(var DynArray: TDynArray;
  WriteOptions: TTextWriterWriteObjectOptions);
var
  ctxt: TJsonSaveContext;
  len, backup: PtrInt;
  hacklen: PDALen;
begin
  len := DynArray.Count;
  if len = 0 then
    Add('[', ']')
  else
  begin
    {%H-}ctxt.Init(self, WriteOptions, DynArray.Info);
    hacklen := PDALen(PAnsiChar(DynArray.Value^) - _DALEN);
    backup := hacklen^;
    hacklen^ := len - _DAOFF; // may use ExternalCount -> ovewrite length(Array)
    _JS_DynArray(DynArray.Value, ctxt);
    hacklen^ := backup; // restore original length/capacity
  end;
end;

procedure TJsonWriter.AddDynArrayJson(var DynArray: TDynArrayHashed;
  WriteOptions: TTextWriterWriteObjectOptions);
begin
  // needed if UNDIRECTDYNARRAY is defined (Delphi 2009+)
  AddDynArrayJson(PDynArray(@DynArray)^, WriteOptions);
end;

function TJsonWriter.AddDynArrayJson(Value: pointer; Info: TRttiCustom;
  WriteOptions: TTextWriterWriteObjectOptions): PtrInt;
var
  temp: TDynArray;
begin
  if Info.Kind <> rkDynArray then
    raise EDynArray.CreateUtf8('%.AddDynArrayJson: % is %, expected rkDynArray',
      [self, Info.Name, ToText(Info.Kind)^]);
  temp.InitRtti(Info, Value^);
  AddDynArrayJson(temp, WriteOptions);
  result := temp.Info.Cache.ItemSize;
end;


{ ********** Low-Level JSON UnSerialization for all TRttiParserType }

{ TJsonParserContext }

procedure TJsonParserContext.InitParser(P: PUtf8Char; Rtti: TRttiCustom;
  O: TJsonParserOptions; CV: PDocVariantOptions; ObjectListItemClass: TClass;
  RawUtf8Interning: TRawUtf8Interning);
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
  Valid := true;
  Interning := RawUtf8Interning;
  if Rtti <> nil then
    O := O + TRttiJson(Rtti).fIncludeReadOptions;
  Options := O;
  if CV <> nil then
  begin
    DVO := CV^;
    CustomVariant := @DVO;
  end
  else if jpoHandleCustomVariants in O then
  begin
    if jpoAllowDouble in o then
      DVO := JSON_FAST_FLOAT
    else
      DVO := JSON_FAST;
    CustomVariant := @DVO;
  end
  else
    CustomVariant := nil;
  if jpoHandleCustomVariantsWithinString in O then
    include(DVO, dvoJsonObjectParseWithinString);
  Info := Rtti;
  Prop := nil;
  if ObjectListItemClass = nil then
    ObjectListItem := nil
  else
    ObjectListItem := mormot.core.rtti.Rtti.RegisterClass(ObjectListItemClass);
end;

{$ifdef USERECORDWITHMETHODS}
function TJsonParserContext.Json: PUtf8Char;
begin
  result := Get.Json;
end;

function TJsonParserContext.Value: PUtf8Char;
begin
  result := Get.Value;
end;

function TJsonParserContext.ValueLen: PtrInt;
begin
  result := Get.ValueLen;
end;

function TJsonParserContext.WasString: boolean;
begin
  result := Get.WasString;
end;

function TJsonParserContext.EndOfObject: AnsiChar;
begin
  result := Get.EndOfObject;
end;

{$endif USERECORDWITHMETHODS}

function TJsonParserContext.ParseNext: boolean;
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}GetJsonField;
  result := Json <> nil;
  Valid := result;
end;

function TJsonParserContext.ParseNextAny: boolean;
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}GetJsonFieldOrObjectOrArray;
  result := Json <> nil;
  Valid := result;
end;

function TJsonParserContext.ParseUtf8: RawUtf8;
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}GetJsonField;
  Valid := Json <> nil;
  Interning.Unique(result, Value, ValueLen)
end;

function TJsonParserContext.ParseString: string;
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}GetJsonField;
  Valid := Json <> nil;
  Utf8DecodeToString(Value, ValueLen, result);
end;

function TJsonParserContext.ParseInteger: Int64;
begin
  if ParseNext then
    SetInt64(Value, result{%H-})
  else
    result := 0;
end;

procedure TJsonParserContext.ParseEndOfObject;
var
  P: PUtf8Char;
begin
  if Valid then
  begin
    P := Json;
    if P^ <> #0 then
      P := mormot.core.json.ParseEndOfObject(
        P, {$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
    {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
    Valid := P <> nil;
  end;
end;

function TJsonParserContext.ParseNull: boolean;
var
  P: PUtf8Char;
begin
  result := false;
  if Valid then
    if Json <> nil then
    begin
      P := GotoNextNotSpace(Json);
      {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
      if PCardinal(P)^ = NULL_LOW then
      begin
        P := mormot.core.json.ParseEndOfObject(
          P + 4, {$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
        if P <> nil then
        begin
          {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
          result := true;
        end
        else
          Valid := false;
      end;
    end
    else
      result := true; // nil -> null
end;

function TJsonParserContext.ParseArray: boolean;
var
  P: PUtf8Char;
begin
  result := false; // no need to parse
  P := GotoNextNotSpace(Json);
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
  if P^ = '[' then
  begin
    P := GotoNextNotSpace(P + 1); // ignore trailing [
    if P^ = ']' then
    begin
      // void but valid array
      P := mormot.core.json.ParseEndOfObject(
        P + 1, {$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
      Valid := P <> nil;
      {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
    end
    else
    begin
      // we have a non void [...] array -> caller should parse it
      result := true;
      {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
    end;
  end
  else
    Valid := ParseNull; // only not [...] value allowed is null
end;

function TJsonParserContext.ParseObject: boolean;
var
  P: PUtf8Char;
begin
  result := false; // no need to parse
  P := GotoNextNotSpace(Json);
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
  if P^ = '{' then
  begin
    P := GotoNextNotSpace(P + 1); // ignore trailing {
    if P^ = '}' then
    begin
      // void but valid array
      P := mormot.core.json.ParseEndOfObject(
        P + 1, {$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
      Valid := P <> nil;
      {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
    end
    else
    begin
      // we have a non void {...} array -> caller should parse it
      result := true;
      {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P;
    end;
  end
  else
    Valid := ParseNull; // only not {...} value allowed is null
end;

function TJsonParserContext.ParseNewObject: TObject;
begin
  if ObjectListItem = nil then
  begin
    Info := JsonRetrieveObjectRttiCustom({$ifdef USERECORDWITHMETHODS}Get.{$endif}Json,
      jpoObjectListClassNameGlobalFindClass in Options);
    if (Info <> nil) and
       (Json^ = ',') then
      Json^ := '{' // to parse other properties as a regular Json object
    else
    begin
      Valid := false;
      result := nil;
      exit;
    end;
  end;
  result := TRttiJson(Info).ParseNewInstance(self);
end;

function TJsonParserContext.ParseObject(const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray; HandleValuesAsObjectOrArray: boolean): boolean;
begin
  {$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := JsonDecode(
    Json, Names, Values, HandleValuesAsObjectOrArray);
  if Json = nil then
    Valid := false
  else
    ParseEndOfObject;
  result := Valid;
end;

procedure _JL_Boolean(Data: PBoolean; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetBoolean(Ctxt.Value);
end;

procedure _JL_Byte(Data: PByte; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetCardinal(Ctxt.Value);
end;

procedure _JL_Cardinal(Data: PCardinal; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetCardinal(Ctxt.Value);
end;

procedure _JL_Integer(Data: PInteger; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetInteger(Ctxt.Value);
end;

procedure _JL_Currency(Data: PInt64; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := StrToCurr64(Ctxt.Value);
end;

procedure _JL_Double(Data: PDouble; var Ctxt: TJsonParserContext);
var
  err: integer;
begin
  if Ctxt.ParseNext then
  begin
    unaligned(Data^) := GetExtended(Ctxt.Value, err);
    Ctxt.Valid := (Ctxt.Value = nil) or (err = 0);
  end;
end;

procedure _JL_Extended(Data: PSynExtended; var Ctxt: TJsonParserContext);
var
  err: integer;
begin
  if Ctxt.ParseNext then
  begin
    Data^ := GetExtended(Ctxt.Value, err);
    Ctxt.Valid := (Ctxt.Value = nil) or (err = 0);
  end;
end;

procedure _JL_Int64(Data: PInt64; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString and
       (Ctxt.ValueLen = SizeOf(Data^) * 2) then
      Ctxt.Valid := (jpoAllowInt64Hex in Ctxt.Options) and
        HexDisplayToBin(PAnsiChar(Ctxt.Value), pointer(Data), SizeOf(Data^))
    else
      SetInt64(Ctxt.Value, Data^);
end;

procedure _JL_QWord(Data: PQWord; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString and
       (Ctxt.ValueLen = SizeOf(Data^) * 2) then
      Ctxt.Valid := (jpoAllowInt64Hex in Ctxt.Options) and
        HexDisplayToBin(PAnsiChar(Ctxt.Value), pointer(Data), SizeOf(Data^))
    else
      SetQWord(Ctxt.Value, Data^);
end;

procedure _JL_RawByteString(Data: PRawByteString; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.Value = nil then // null
      Data^ := ''
    else if not Ctxt.WasString then
      Ctxt.Valid := false
    else if Base64MagicTryAndDecode(Ctxt.Value, Ctxt.ValueLen, Data^) then
      exit // base64-encoded, with magic or not
    else
      FastSetRawByteString(Data^, Ctxt.Value, Ctxt.ValueLen); // fallback as text
end;

procedure _JL_RawJson(Data: PRawJson; var Ctxt: TJsonParserContext);
begin
  GetJsonItemAsRawJson(Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json,
    Data^, @Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
  Ctxt.Valid := Ctxt.Json <> nil;
end;

procedure _JL_RawUtf8(Data: PRawByteString; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    // will handle RawUtf8 but also AnsiString, WinAnsiString or other CP
    if Ctxt.Info.Cache.CodePage = CP_UTF8 then
      Ctxt.Interning.Unique(RawUtf8(Data^), Ctxt.Value, Ctxt.ValueLen)
    else if Ctxt.Info.Cache.CodePage >= CP_RAWBLOB then
      Ctxt.Valid := false // paranoid check (RawByteString should handle it)
    else
      Ctxt.Info.Cache.Engine.Utf8BufferToAnsi(Ctxt.Value, Ctxt.ValueLen, Data^);
end;

procedure _JL_Single(Data: PSingle; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetExtended(Ctxt.Value);
end;

procedure _JL_String(Data: PString; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Utf8DecodeToString(Ctxt.Value, Ctxt.ValueLen, Data^);
end;

procedure _JL_SynUnicode(Data: PSynUnicode; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Utf8ToSynUnicode(Ctxt.Value, Ctxt.ValueLen, Data^);
end;

procedure _JL_Char(Data: PByte; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
      if Ctxt.ValueLen <> 0 then
        Data^ := ord(Ctxt.Value[0]) // get the first char of the input string
      else
        Data^ := 0 // _JS_Char serializes #0 as ""
    else
      Data^ := GetCardinal(Ctxt.Value); // allow serialization as integer
end;

procedure _JL_WideChar(Data: PWord; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
      Data^ := GetUtf8WideChar(Ctxt.Value)
    else
      Data^ := GetCardinal(Ctxt.Value);
end;

procedure _JL_DateTime(Data: PDateTime; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
      Iso8601ToDateTimePUtf8CharVar(Ctxt.Value, Ctxt.ValueLen, Data^)
    else
      Data^ := GetExtended(Ctxt.Value); // was propbably stored as double
end;

procedure _JL_GUID(Data: PByteArray; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Ctxt.Valid := TextToGuid(Ctxt.Value, Data) <> nil;
end;

procedure _JL_Hash(Data: PByte; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Ctxt.Valid := (Ctxt.ValueLen = Ctxt.Info.Size * 2) and
      HexDisplayToBin(PAnsiChar(Ctxt.Value), Data, Ctxt.Info.Size);
end;

procedure _JL_Binary(Data: PByte; var Ctxt: TJsonParserContext);
var
  v: QWord;
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
    begin
      FillZeroSmall(Data, Ctxt.Info.Size); // BinarySize may be < Size
      if Ctxt.ValueLen > 0 then // "" -> is valid 0
        Ctxt.Valid := (Ctxt.ValueLen = Ctxt.Info.BinarySize * 2) and
          HexDisplayToBin(PAnsiChar(Ctxt.Value), Data, Ctxt.Info.BinarySize);
    end
    else
    begin
      SetQWord(Ctxt.Value, v{%H-});
      MoveFast(v, Data^, Ctxt.Info.Size);
    end;
end;

procedure _JL_TimeLog(Data: PQWord; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
      Data^ := Iso8601ToTimeLogPUtf8Char(Ctxt.Value, Ctxt.ValueLen)
    else
      SetQWord(Ctxt.Value, Data^);
end;

procedure _JL_UnicodeString(Data: pointer; var Ctxt: TJsonParserContext);
begin
  Ctxt.ParseNext;
  {$ifdef HASVARUSTRING}
  if Ctxt.Valid then
    Utf8DecodeToUnicodeString(Ctxt.Value, Ctxt.ValueLen, PUnicodeString(Data)^);
  {$endif HASVARUSTRING}
end;

procedure _JL_UnixTime(Data: PQWord; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
      Data^ := TimeLogToUnixTime(Iso8601ToTimeLogPUtf8Char(
        Ctxt.Value, Ctxt.ValueLen))
    else
      SetQWord(Ctxt.Value, Data^);
end;

procedure _JL_UnixMSTime(Data: PQWord; var Ctxt: TJsonParserContext);
var
  dt: TDateTime; // for ms resolution
begin
  if Ctxt.ParseNext then
    if Ctxt.WasString then
    begin
      Iso8601ToDateTimePUtf8CharVar(Ctxt.Value, Ctxt.ValueLen, dt);
      Data^ := DateTimeToUnixMSTime(dt);
    end
    else
      SetQWord(Ctxt.Value, Data^);
end;

procedure _JL_Variant(Data: PVariant; var Ctxt: TJsonParserContext);
begin
  JsonToAnyVariant(Data^, Ctxt{$ifdef USERECORDWITHMETHODS}.Get{$endif},
    Ctxt.CustomVariant, jpoAllowDouble in Ctxt.Options);
  Ctxt.Valid := Ctxt.Json <> nil;
end;

procedure _JL_WideString(Data: PWideString; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Utf8ToWideString(Ctxt.Value, Ctxt.ValueLen, Data^);
end;

procedure _JL_WinAnsi(Data: PRawByteString; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    WinAnsiConvert.Utf8BufferToAnsi(Ctxt.Value, Ctxt.ValueLen, Data^);
end;

procedure _JL_Word(Data: PWord; var Ctxt: TJsonParserContext);
begin
  if Ctxt.ParseNext then
    Data^ := GetCardinal(Ctxt.Value);
end;

procedure _JL_Enumeration(Data: pointer; var Ctxt: TJsonParserContext);
var
  v: PtrInt;
  err: integer;
begin
  if Ctxt.ParseNext then
  begin
    if Ctxt.WasString then
      v := Ctxt.Info.Cache.EnumInfo.GetEnumNameValue(Ctxt.Value, Ctxt.ValueLen)
    else
    begin
      v := GetInteger(Ctxt.Value, err);
      if (err <> 0) or
         (PtrUInt(v) > Ctxt.Info.Cache.EnumMax) or
         (PtrUInt(v) < Ctxt.Info.Cache.EnumMin) then
        v := -1;
    end;
    if v < 0 then
      if jpoIgnoreUnknownEnum in Ctxt.Options then
        v := 0
      else
        Ctxt.Valid := false;
    MoveFast(v, Data^, Ctxt.Info.Size);
  end;
end;

procedure _JL_Set(Data: pointer; var Ctxt: TJsonParserContext);
var
  v: QWord;
begin
  with Ctxt.Info.Cache do
    v := GetSetNameValue(EnumList, EnumMin, EnumMax,
      Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json,
      Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
  Ctxt.Valid := Ctxt.Json <> nil;
  MoveFast(v, Data^, Ctxt.Info.Size);
end;

function JsonLoadProp(Data: PAnsiChar; Prop: PRttiCustomProp;
  var Ctxt: TJsonParserContext): boolean; {$ifdef HASINLINE} inline; {$endif}
var
  load: TRttiJsonLoad;
begin
  Ctxt.Info := Prop^.Value; // caller will restore it afterwards
  Ctxt.Prop := Prop;
  load := Ctxt.Info.JsonLoad;
  if not Assigned(load) then
    Ctxt.Valid := false
  else if Prop^.OffsetSet >= 0 then
    if (rcfHookReadProperty in Ctxt.Info.Flags) and
       TCCHook(Data).RttiBeforeReadPropertyValue(@Ctxt, Prop) then
      // custom parsing method (e.g. TOrm nested TOrm properties)
    else
      // default fast parsing into the property/field memory
      load(Data + Prop^.OffsetSet, Ctxt)
  else
    // we need to call a setter
    Ctxt.ParsePropComplex(Data);
  Ctxt.Prop := nil;
  result := Ctxt.Valid;
end;

procedure _JL_RttiCustomProps(Data: PAnsiChar; var Ctxt: TJsonParserContext);
var
  j: PUtf8Char;
  root: TRttiJson;
  prop: PRttiCustomProp;
  propname: PUtf8Char;
  p, propnamelen: integer;
label
  no, nxt, any;
begin
  // regular JSON unserialization using nested fields/properties
  j := GotoNextNotSpace(Ctxt.Json);
  if j^ <> '{' then
  begin
no: Ctxt.Valid := false;
    exit;
  end;
  repeat
    inc(j);
  until not (j^ in [#1..' ']);
  if j^ <> '}' then
  begin
    Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := j;
    root := pointer(Ctxt.Info); // Ctxt.Info overriden in JsonLoadProp()
    prop := pointer(root.Props.List);
    for p := 1 to root.Props.Count do
    begin
nxt:  propname := GetJsonPropName(
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json, @propnamelen);
      if (Ctxt.Json = nil) or
         (propname = nil) then
        goto no;
      // O(1) optimistic process of the property name, following RTTI order
      if prop^.NameMatch(propname, propnamelen) then
        if JsonLoadProp(Data, prop, Ctxt) then
          if Ctxt.EndOfObject = '}' then
            break
          else
            inc(prop)
        else
          break
      else if (Ctxt.Info.Kind = rkClass) and
              (propnamelen = 9) and // fast "ClassName" case sensitive match
              (PIntegerArray(propname)[0] =
                ord('C') + ord('l') shl 8 + ord('a') shl 16 + ord('s') shl 24) and
              (PIntegerArray(propname)[1] =
                ord('s') + ord('N') shl 8 + ord('a') shl 16 + ord('m') shl 24) and
              (propname[8] = 'e') then
      // woStoreClassName was used -> just ignore the class name
      begin
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := GotoNextJsonItem(
          Ctxt.Json, Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
        if Ctxt.Json <> nil then
          goto nxt;
        goto no;
      end
      else
      begin
        // we didn't find the property in its natural place -> full lookup
        repeat
          prop := FindCustomProp(pointer(root.Props.List),
            propname, propnamelen, root.Props.Count);
          if prop = nil then
            // unexpected "prop": value
            if (rcfReadIgnoreUnknownFields in root.Flags) or
               (jpoIgnoreUnknownProperty in Ctxt.Options) then
            begin
              Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := GotoNextJsonItem(
                Ctxt.Json, Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject);
              if Ctxt.Json = nil then
                goto no;
            end
            else
              goto no
          else if not JsonLoadProp(Data, prop, Ctxt) then
            goto no;
          if Ctxt.EndOfObject = '}' then
             break;
any:      propname := GetJsonPropName(
            Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json, @propnamelen);
          if (Ctxt.Json = nil) or
             (propname = nil) then
            goto no;
        until false;
        break;
      end;
    end;
    if Ctxt.Valid and
       (Ctxt.EndOfObject = ',') and
       ((rcfReadIgnoreUnknownFields in root.Flags) or
        (jpoIgnoreUnknownProperty in Ctxt.Options)) then
      goto any;
    Ctxt.Info := root; // restore
  end
  else // {}
    Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := j + 1;
  Ctxt.ParseEndOfObject; // mimics GetJsonField() - set Ctxt.EndOfObject
end;

procedure _JL_RttiCustom(Data: PAnsiChar; var Ctxt: TJsonParserContext);
begin
  if Ctxt.Json <> nil then
    Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := GotoNextNotSpace(Ctxt.Json);
  if TRttiJson(Ctxt.Info).fJsonReader.Code <> nil then
  begin // TRttiJson.RegisterCustomSerializer() - e.g. TOrm.RttiJsonRead
    if Ctxt.Info.Kind = rkClass then
    begin
      if PPointer(Data)^ = nil then // e.g. from _JL_DynArray for T*ObjArray
        PPointer(Data)^ := TRttiJson(Ctxt.Info).fNewInstance(Ctxt.Info);
      Data := PPointer(Data)^; // as expected by the callback
    end;
    TOnRttiJsonRead(TRttiJson(Ctxt.Info).fJsonReader)(Ctxt, Data)
  end
  else
  begin
    // always finalize and reset the existing values (in case of missing props)
    if Ctxt.Info.Kind = rkClass then
    begin
      if Ctxt.ParseNull then
      begin
        if not (jpoNullDontReleaseObjectInstance in Ctxt.Options) then
          FreeAndNil(PObject(Data)^);
        exit;
      end;
      if PPointer(Data)^ = nil then // e.g. from _JL_DynArray for T*ObjArray
        PPointer(Data)^ := TRttiJson(Ctxt.Info).fNewInstance(Ctxt.Info)
      else if (jpoClearValues in Ctxt.Options) and
              not (rcfClassMayBeID in Ctxt.Info.Flags) then
        Ctxt.Info.Props.FinalizeAndClearPublishedProperties(PPointer(Data)^);
      // class instances are accessed by reference, records are stored by value
      Data := PPointer(Data)^;
      if (rcfHookRead in Ctxt.Info.Flags) and
         TCCHook(Data).RttiBeforeReadObject(@Ctxt) then
        exit;
    end
    else
    begin
      if jpoClearValues in Ctxt.Options then
        Ctxt.Info.ValueFinalizeAndClear(Data);
      if Ctxt.ParseNull then
        exit;
    end;
    // regular JSON unserialization using nested fields/properties
    _JL_RttiCustomProps(Data, Ctxt);
    if rcfHookRead in Ctxt.Info.Flags then
      TCCHook(Data).RttiAfterReadObject;
  end;
end;

procedure _JL_RttiObjectWithID(Data: PAnsiChar; var Ctxt: TJsonParserContext);
var
  P: PUtf8Char;
begin
  P := Ctxt.Json;
  if P <> nil then // in-place replace trailing RowID -> ID for unserialization
  begin
    while (P^ <= ' ') and
          (P^ <> #0) do
      inc(P);
    if P^ = '{' then
    begin
      repeat
        inc(P);
      until (P^ > ' ') or
            (P^ = #0);
      if PInt64(P)^ and $00ffdfdfdfdfdfff = // case insensitive search
        ord('"') + ord('R') shl 8 + ord('O') shl 16 + ord('W') shl 24 +
        Int64(ord('I')) shl 32 + Int64(ord('D')) shl 40 + Int64(ord('"')) shl 48 then
      begin // "RowID" -> __{"ID"
        PCardinal(P)^ := $2020 + ord('{') shl 16 + ord('"') shl 24;
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P + 2;
      end
      else if PInt64(P)^ and $0000ffdfdfdfdfdf =
        ord('R') + ord('O') shl 8 + ord('W') shl 16 + ord('I') shl 24 +
        Int64(ord('D')) shl 32 + Int64(ord(':')) shl 40 then
      begin // RowID: -> __{ID:
        PCardinal(P)^ := $2020 + ord('{') shl 16 + ord('I') shl 24;
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := P + 2;
      end;
    end;
  end;
  _JL_RttiCustom(Data, Ctxt); // use default serialization
end;

procedure _JL_Array(Data: PAnsiChar; var Ctxt: TJsonParserContext);
var
  n: integer;
  arrinfo: TRttiCustom;
begin
  if not Ctxt.ParseArray then
    // detect void (i.e. []) or invalid array
    exit;
  if PCardinal(Ctxt.Json)^ = JSON_BASE64_MAGIC_QUOTE_C then
    // raw RTTI binary layout with a single Base64 encoded item
    Ctxt.Valid := Ctxt.ParseNext and
              (Ctxt.EndOfObject = ']') and
              (Ctxt.Value <> nil) and
              (PCardinal(Ctxt.Value)^ and $ffffff = JSON_BASE64_MAGIC_C) and
              BinaryLoadBase64(pointer(Ctxt.Value + 3), Ctxt.ValueLen - 3,
                Data, Ctxt.Info.Info, {uri=}false, [rkArray], {withcrc=}false)
  else
  begin
    // efficient load of all JSON items
    arrinfo := Ctxt.Info;
    Ctxt.Info := arrinfo.ArrayRtti; // nested context = item
    n := arrInfo.Cache.ItemCount;
    repeat
      TRttiJsonLoad(Ctxt.Info.JsonLoad)(Data, Ctxt);
      dec(n);
      if Ctxt.Valid then
        if (n > 0) and
           (Ctxt.EndOfObject = ',') then
        begin
          // continue with the next item
          inc(Data, arrinfo.Cache.ItemSize);
          continue;
        end
        else if (n = 0) and
                (Ctxt.EndOfObject = ']') then
          // reached end of arrray
          break;
      Ctxt.Valid := false; // unexpected end
      exit;
    until false;
    Ctxt.Info := arrinfo;
  end;
  Ctxt.ParseEndOfObject; // mimics GetJsonField() / Ctxt.ParseNext
end;

procedure _JL_DynArray_Custom(Data: PAnsiChar; var Ctxt: TJsonParserContext);
begin
  // TRttiJson.RegisterCustomSerializer() custom callback for each item
  TOnRttiJsonRead(TRttiJson(Ctxt.Info).fJsonReader)(Ctxt, Data);
end;

function _JL_DynArray_FromResults(Data: PPointer; var Ctxt: TJsonParserContext): boolean;
var
  fieldcount, rowcount, r, f: PtrInt;
  arrinfo, iteminfo: TRttiCustom;
  item: PAnsiChar;
  prop: PRttiCustomProp;
  props: PRttiCustomPropDynArray;
begin
  // Not Expanded (more optimized) format as array of values
  // {"fieldCount":2,"values":["f1","f2","1v1",1v2,"2v1",2v2...],"rowCount":20}
  result := IsNotExpandedBuffer(Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json,
    nil, fieldcount, rowcount);
  if not result then
    exit; // indicates not the expected format: caller will try Ctxt.ParseArray
  // 1. check rowcount and fieldcount
  Ctxt.Valid := false;
  if (rowcount < 0) or
     (fieldcount = 0) then
    exit;
  // 2. initialize the items lookup from the trailing field names
  arrinfo := Ctxt.Info;
  iteminfo := arrinfo.ArrayRtti;
  if (iteminfo = nil) or
     (iteminfo.Props.CountNonVoid = 0) then
    exit; // expect an array of objects (classes or records)
  SetLength(props, fieldcount);
  for f := 0 to fieldcount - 1 do
  begin
    if not Ctxt.ParseNext or
       not Ctxt.WasString then
      exit; // should start with field names
    prop := nil;
    if Ctxt.ValueLen <> 0 then
    begin
      prop := FindCustomProp(pointer(iteminfo.Props.List),
        Ctxt.Value, Ctxt.ValueLen, iteminfo.Props.Count);
      if (prop = nil) and
         (itemInfo.ValueRtlClass = vcObjectWithID) and
         (PInteger(Ctxt.Value)^ and $dfdfdfdf =
           ord('R') + ord('O') shl 8 + ord('W') shl 16 + ord('I') shl 24) and
         (PWord(Ctxt.Value + 4)^ and $ffdf = ord('D')) then
        prop := @iteminfo.Props.List[0]; // 'RowID' = first TObjectWithID field
    end;
    if (prop = nil) and
       not (jpoIgnoreUnknownProperty in Ctxt.Options) then
      exit;
    props[f] := prop;
  end;
  // 3. fill all nested items from incoming values
  Data := DynArrayNew(Data, rowcount, arrinfo.Cache.ItemSize); // alloc
  for r := 1 to rowcount do
  begin
    if iteminfo.Kind = rkClass then
    begin
      Ctxt.Info := iteminfo; // as in _JL_RttiCustom()
      Data^ := TRttiJson(iteminfo).fNewInstance(iteminfo);
      item := Data^; // class are accessed by reference
      if (rcfHookRead in iteminfo.Flags) and
         TCCHook(item).RttiBeforeReadObject(@Ctxt) then
      begin
        inc(Data);
        if Ctxt.Valid then
          continue
        else
          break;
      end;
    end
    else
      item := pointer(Data); // record (or object) are stored by value
    for f := 0 to fieldcount - 1 do
      if props[f] = nil then // skip jpoIgnoreUnknownProperty
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := GotoNextJsonItem(
          Ctxt.Json, Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}EndOfObject)
      else if not JsonLoadProp(item, props[f], Ctxt) then
      begin
        Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := nil;
        break;
      end
      else if Ctxt.EndOfObject = '}' then
        break;
    if Ctxt.Json = nil then
        break;
    if rcfHookRead in iteminfo.Flags then
      TCCHook(item).RttiAfterReadObject;
    inc(PAnsiChar(Data), arrinfo.Cache.ItemSize);
  end;
  Ctxt.Valid := false;
  if Ctxt.Json <> nil then
  begin
    while not (Ctxt.Json^ in [#0, '}']) do
      inc(Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json);
    if Ctxt.Json^ = '}' then
    begin // reached final ..],"rowCount":20}
      inc(Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json);
      Ctxt.Valid := true;
    end;
  end;
  Ctxt.Info := arrinfo; // restore
end;

procedure _JL_DynArray(Data: PAnsiChar; var Ctxt: TJsonParserContext);
var
  load: TRttiJsonLoad;
  n, cap: PtrInt;
  arr: PPointer;
  arrinfo: TRttiCustom;
begin
  arr := pointer(Data);
  if arr^ <> nil then
    Ctxt.Info.ValueFinalize(arr); // reset whole array variable
  if Ctxt.Json = nil then
  begin
    Ctxt.Valid := false;
    exit;
  end;
  Ctxt.{$ifdef USERECORDWITHMETHODS}Get.{$endif}Json := GotoNextNotSpace(Ctxt.Json);
  if (PCardinal(Ctxt.Json)^ <> ord('{') + ord('"') shl 8 + ord('f') shl 16 +
      ord('i') shl 24) or // FIELDCOUNT_PATTERN = '{"fieldCount":...
    not _JL_DynArray_FromResults(arr, Ctxt) then
  if not Ctxt.ParseArray then
    // detect void (i.e. []) or invalid array
    exit
  else if PCardinal(Ctxt.Json)^ = JSON_BASE64_MAGIC_QUOTE_C then
    // raw RTTI binary layout with a single Base64 encoded item
    Ctxt.Valid := Ctxt.ParseNext and
              (Ctxt.EndOfObject = ']') and
              (Ctxt.Value <> nil) and
              (PCardinal(Ctxt.Value)^ and $ffffff = JSON_BASE64_MAGIC_C) and
              BinaryLoadBase64(pointer(Ctxt.Value + 3), Ctxt.ValueLen - 3,
                Data, Ctxt.Info.Info, {uri=}false, [rkDynArray], {withcrc=}false)
  else
  begin
    // efficient load of all JSON items
    arrinfo := Ctxt.Info;
    if TRttiJson(arrinfo).fJsonReader.Code <> nil then
      load := @_JL_DynArray_Custom // custom callback
    else
    begin
      Ctxt.Info := arrinfo.ArrayRtti;
      if Ctxt.Info = nil then
        load := nil
      else
      begin
        load := Ctxt.Info.JsonLoad;
        if (@load = @_JL_RttiCustom) and
           (TRttiJson(Ctxt.Info).fJsonReader.Code = nil) and
           (Ctxt.Info.Kind <> rkClass) and
           (not (jpoClearValues in Ctxt.Options)) then
          load := @_JL_RttiCustomProps; // somewhat faster direct record load
      end;
    end;
    // initial guess of the JSON array count - will browse up to 64KB of input
    cap := abs(JsonArrayCount(Ctxt.Json, Ctxt.Json + JSON_PREFETCH));
    if (cap = 0) or
       (not Assigned(load)) then
    begin
      Ctxt.Valid := false;
      exit;
    end;
    Data := DynArrayNew(arr, cap, arrinfo.Cache.ItemSize); // alloc zeroed mem
    // main JSON unserialization loop
    n := 0;
    repeat
      if n = cap then
      begin
        // grow if our initial guess was aborted due to huge input
        cap := NextGrow(cap);
        Data := DynArrayGrow(arr, cap, arrinfo.Cache.ItemSize) +
                  (n * arrinfo.Cache.ItemSize);
      end;
      // unserialize one item
      load(Data, Ctxt); // will call _JL_RttiCustom() for T*ObjArray
      inc(n);
      if Ctxt.Valid then
        if Ctxt.EndOfObject = ',' then
        begin
          // continue with the next item
          inc(Data, arrinfo.Cache.ItemSize);
          continue;
        end
        else if Ctxt.EndOfObject = ']' then
          // reached end of arrray
          break;
      Ctxt.Valid := false; // unexpected end
      arrinfo.ValueFinalize(arr); // whole array clear on error
      exit;
    until false;
    if n <> cap then
      if n = 0 then
        FastDynArrayClear(arr^, arrinfo.Cache.ItemInfo)
      else
        DynArrayFakeLength(arr^, n); // faster than SetLength()
    Ctxt.Info := arrinfo; // restore
  end;
  Ctxt.ParseEndOfObject; // mimics GetJsonField() / Ctxt.ParseNext
end;

procedure _JL_Interface(Data: PInterface; var Ctxt: TJsonParserContext);
begin
  // _JS_Interface() may have serialized the object instance properties, but we
  // can't unserialize it since we don't know which class to create
  Ctxt.Valid := Ctxt.ParseNull;
  Data^ := nil;
end;

procedure _JL_PUtf8Char(Data: PPUtf8Char; var Ctxt: TJsonParserContext);
begin
  // _JS_PUtf8Char() may have been serialized as JSON string, but we can't
  // unserialize it since we can't allocate the memory and Ctxt.Json
  // input is transient by definition
  Ctxt.Valid := Ctxt.ParseNull;
  Data^ := nil;
end;

// defined here to have _JL_RawJson and _JL_Variant known
procedure TJsonParserContext.ParsePropComplex(Data: pointer);
var
  v: TRttiVarData;
  tmp: TObject;
begin
  // handle special cases of a setter method
  case Info.Parser of
    ptClass: // for a class property: use a temp instance for the setter call
      begin
        if jpoSetterNoCreate in Options then
          Valid := false
        else
        begin
          tmp := TRttiJson(Info).fNewInstance(Info);
          try
            v.Prop := Prop; // JsonLoad() would reset Prop := nil
            TRttiJsonLoad(Info.JsonLoad)(@tmp, self); // JsonToObject(tmp)
            if not Valid then
              FreeAndNil(tmp)
            else
            begin
              v.Prop.Prop.SetOrdProp(Data, PtrInt(tmp));
              if jpoSetterExpectsToFreeTempInstance in Options then
                FreeAndNil(tmp);
            end;
          except
            on Exception do
              tmp.Free;
          end;
        end;
      end;
    ptRawJson: // TRttiProp.SetValue() assume RawUtf8 -> dedicated RawJson code
      begin
        v.Data.VAny := nil;
        try
          _JL_RawJson(@v.Data.VAny, self);
          if Valid then
            Prop^.Prop.SetLongStrProp(Data, RawJson(v.Data.VAny));
        finally
          FastAssignNew(v.Data.VAny);
        end;
      end;
    ptSet: // use a local temp variable before calling the setter
      begin
        v.Data.VInt64 := 0;
        _JL_Set(@v.Data.VInt64, self);
        if Valid then
          Prop^.Prop.SetOrdProp(Data, v.Data.VInt64);
      end;
  else // call the getter via TRttiProp.SetValue() of a transient TRttiVarData
    begin
      v.VType := 0;
      try
        _JL_Variant(@v, self); // VariantLoadJson() over Ctxt
        Valid := Valid and Prop^.Prop.SetValue(Data, variant(v));
      finally
        VarClearProc(v.Data);
      end;
    end;
  end;
end;

procedure _JL_TObjectList(Data: PObjectList; var Ctxt: TJsonParserContext);
var
  root: TRttiCustom;
  item: TObject;
begin
  if Data^ = nil then
  begin
    Ctxt.Valid := Ctxt.ParseNull;
    exit;
  end;
  Data^.Clear;
  if Ctxt.ParseNull or
     not Ctxt.ParseArray then
    exit;
  root := Ctxt.Info;
  Ctxt.Info := Ctxt.ObjectListItem;
  repeat
    item := Ctxt.ParseNewObject;
    if item = nil then
      break;
    Data^.Add(item);
  until Ctxt.EndOfObject = ']';
  Ctxt.Info := root;
  Ctxt.ParseEndOfObject;
end;

procedure _JL_TCollection(Data: PCollection; var Ctxt: TJsonParserContext);
var
  root: TRttiJson;
  load: TRttiJsonLoad;
  item: TCollectionItem;
begin
  if Data^ = nil then
  begin
    Ctxt.Valid := Ctxt.ParseNull;
    exit;
  end;
  Data^.BeginUpdate;
  try
    Data^.Clear;
    if Ctxt.ParseNull or
       not Ctxt.ParseArray then
      exit;
    root := TRttiJson(Ctxt.Info);
    load := nil;
    repeat
      item := Data^.Add;
      if not Assigned(load) then
      begin
        if root.fCollectionItemRtti = nil then
        begin
          // RegisterCollection() was not called -> compute after Data^.Add
          root.fCollectionItem := PPointer(item)^;
          root.fCollectionItemRtti := Rtti.RegisterClass(PClass(item)^);
        end;
        Ctxt.Info := root.fCollectionItemRtti;
        load := Ctxt.Info.JsonLoad;
      end;
      load(@item, Ctxt);
    until (not Ctxt.Valid) or
          (Ctxt.EndOfObject = ']');
    Ctxt.Info := root;
    Ctxt.ParseEndOfObject;
  finally
    Data^.EndUpdate;
  end;
end;

procedure _JL_TSynObjectList(Data: PSynObjectList; var Ctxt: TJsonParserContext);
var
  root: TRttiCustom;
  item: TObject;
begin
  if Data^ = nil then
  begin
    Ctxt.Valid := Ctxt.ParseNull;
    exit;
  end;
  Data^.Clear;
  if Ctxt.ParseNull or
     not Ctxt.ParseArray then
    exit;
  root := Ctxt.Info;
  Ctxt.Info := Ctxt.ObjectListItem;
  if (Ctxt.Info = nil) and
     (Data^.ItemClass <> nil) then
    Ctxt.Info := Rtti.RegisterClass(Data^.ItemClass);
  repeat
    item := Ctxt.ParseNewObject;
    if item = nil then
      break;
    Data^.Add(item);
  until Ctxt.EndOfObject = ']';
  Ctxt.Info := root;
  Ctxt.ParseEndOfObject;
end;

procedure _JL_TStrings(Data: PStrings; var Ctxt: TJsonParserContext);
var
  item: string;
begin
  if Data^ = nil then
  begin
    Ctxt.Valid := Ctxt.ParseNull;
    exit;
  end;
  Data^.BeginUpdate;
  try
    Data^.Clear;
    if Ctxt.ParseNull or
       not Ctxt.ParseArray then
      exit;
    repeat
      if Ctxt.ParseNext then
      begin
        Utf8DecodeToString(Ctxt.Value, Ctxt.ValueLen, item);
        Data^.Add(item);
      end;
    until (not Ctxt.Valid) or
          (Ctxt.EndOfObject = ']');
  finally
    Data^.EndUpdate;
  end;
  Ctxt.ParseEndOfObject;
end;

procedure _JL_TRawUtf8List(Data: PRawUtf8List; var Ctxt: TJsonParserContext);
var
  item: RawUtf8;
begin
  if Data^ = nil then
  begin
    Ctxt.Valid := Ctxt.ParseNull;
    exit;
  end;
  Data^.BeginUpdate;
  try
    Data^.Clear;
    if Ctxt.ParseNull or
       not Ctxt.ParseArray then
      exit;
    repeat
      if Ctxt.ParseNext then
      begin
        Ctxt.Interning.Unique(item, Ctxt.Value, Ctxt.ValueLen);
        Data^.AddObject(item, nil);
      end;
    until (not Ctxt.Valid) or
          (Ctxt.EndOfObject = ']');
  finally
    Data^.EndUpdate;
  end;
  Ctxt.ParseEndOfObject;
end;

var
  /// use pointer to allow any kind of Data^ type in above functions
  // - typecast to TRttiJsonSave for proper function call
  // - rkRecord and rkClass are set in TRttiJson.SetParserType
  PT_JSONLOAD: array[TRttiParserType] of pointer = (
    nil, @_JL_Array, @_JL_Boolean, @_JL_Byte, @_JL_Cardinal, @_JL_Currency,
    @_JL_Double, @_JL_Extended, @_JL_Int64, @_JL_Integer, @_JL_QWord,
    @_JL_RawByteString, @_JL_RawJson, @_JL_RawUtf8, nil,
    @_JL_Single, @_JL_String, @_JL_SynUnicode, @_JL_DateTime, @_JL_DateTime,
    @_JL_GUID, @_JL_Hash, @_JL_Hash, @_JL_Hash, @_JL_Int64, @_JL_TimeLog,
    @_JL_UnicodeString, @_JL_UnixTime, @_JL_UnixMSTime, @_JL_Variant,
    @_JL_WideString, @_JL_WinAnsi, @_JL_Word, @_JL_Enumeration, @_JL_Set,
    nil, @_JL_DynArray, @_JL_Interface, @_JL_PUtf8Char, nil);

procedure JsonDecode(var Json: RawUtf8; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray; HandleValuesAsObjectOrArray: boolean);
begin
  JsonDecode(UniqueRawUtf8(Json), Names, Values, HandleValuesAsObjectOrArray);
end;

procedure JsonDecode(var Json: RawJson; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray; HandleValuesAsObjectOrArray: boolean);
begin
  JsonDecode(UniqueRawUtf8(RawUtf8(Json)), Names, Values, HandleValuesAsObjectOrArray);
end;

function JsonDecode(P: PUtf8Char; Names: PPUtf8CharArray; NamesCount: integer;
  Values: PValuePUtf8CharArray; HandleValuesAsObjectOrArray: boolean): PUtf8Char;
var
  v: PValuePUtf8Char;
  name: PUtf8Char;
  namelen, i: integer;
  info: TGetJsonField;
begin
  result := nil;
  if (Values = nil) or
     (NamesCount <= 0) then
    exit; // avoid GPF
  FillCharFast(Values[0], NamesCount * SizeOf(Values[0]), 0);
  dec(NamesCount);
  if P = nil then
    exit;
  while P^ <> '{' do
    if P^ = #0 then
      exit
    else
      inc(P);
  info.Json := P + 1; // jump {
  repeat
    name := GetJsonPropName(info.Json, @namelen);
    if name = nil then
      exit;  // invalid Json content
    info.GetJsonFieldOrObjectOrArray(HandleValuesAsObjectOrArray);
    if not (info.EndOfObject in [',', '}']) then
      exit; // invalid item separator
    v := pointer(Values);
    for i := 0 to NamesCount do
      if (v^.Text = nil) and
         IdemPropNameU(Names[i], name, namelen) then
      begin
        v^.Text := info.Value;
        v^.Len := info.ValueLen;
        break;
      end
      else
        inc(v);
  until (info.Json = nil) or
        (info.EndOfObject = '}');
  if info.Json = nil then // result=nil indicates failure -> points to #0
    result := @NULCHAR
  else
    result := info.Json;
end;

function JsonDecode(P: PUtf8Char; const Names: array of RawUtf8;
  Values: PValuePUtf8CharArray; HandleValuesAsObjectOrArray: boolean): PUtf8Char;
begin
  result := JsonDecode(P, @Names[0], high(Names) + 1,
    Values, HandleValuesAsObjectOrArray);
end;

function JsonDecode(var Json: RawUtf8; const aName: RawUtf8; WasString: PBoolean;
  HandleValuesAsObjectOrArray: boolean): RawUtf8;
begin
  result := JsonDecode(pointer(Json), aName, WasString, HandleValuesAsObjectOrArray);
end;

function JsonDecode(Json: PUtf8Char; const aName: RawUtf8;
  WasString: PBoolean; HandleValuesAsObjectOrArray: boolean): RawUtf8;
var
  info: TGetJsonField;
begin
  result := '';
  if Json = nil then
    exit;
  while Json^ <> '{' do
    if Json^ = #0 then
      exit
    else
      inc(Json);
  info.Json := Json + 1; // jump {
  repeat
    info.Value := GetJsonPropName(info.Json, @info.ValueLen);
    if info.Value = nil then
      exit;  // invalid Json content
    if IdemPropNameU(aName, info.Value, info.ValueLen) then
    begin
      info.GetJsonFieldOrObjectOrArray(HandleValuesAsObjectOrArray);
      if info.Json <> nil then
        FastSetString(result, info.Value, info.ValueLen);
      exit;
    end;
    info.Json := GotoNextJsonItem(info.Json, info.EndOfObject);
    if not (info.EndOfObject in [',', '}']) then
      exit; // invalid item separator
  until (info.Json = nil) or
        (info.EndOfObject = '}');
end;

function JsonDecode(P: PUtf8Char; out Values: TNameValuePUtf8CharDynArray;
  HandleValuesAsObjectOrArray: boolean): PUtf8Char;
var
  n: PtrInt;
  info: TGetJsonField;
  nametext: PUtf8Char;
  namelen: integer;
begin
  {$ifdef FPC}
  Values := nil;
  {$endif FPC}
  result := nil;
  n := 0;
  if P <> nil then
  begin
    while P^ <> '{' do
      if P^ = #0 then
        exit
      else
        inc(P);
    inc(P); // jump {
    info.Json := P;
    repeat
      nametext := GetJsonPropName(info.Json, @nameLen);
      if nametext = nil then
        exit;  // invalid JSON content
      info.GetJsonFieldOrObjectOrArray(HandleValuesAsObjectOrArray);
      if not (info.EndOfObject in [',', '}']) then
        exit; // invalid item separator
      if n = length(Values) then
        SetLength(Values, NextGrow(n));
      with Values[n] do
      begin
        Name.Text := nametext;
        Name.Len := namelen;
        Value.Text := info.Value;
        Value.Len := info.ValueLen;
      end;
      inc(n);
    until (info.Json = nil) or
          (info.EndOfObject = '}');
    P := info.Json;
  end;
  if n <> 0 then
    DynArrayFakeLength(Values, n); // SetLength() would have made a realloc()
  if P = nil then // result=nil indicates failure -> points to #0
    result := @NULCHAR
  else
    result := P;
end;


{ ************ JSON-aware TSynNameValue TSynPersistentStoreJson }

{ TSynNameValue }

procedure TSynNameValue.Add(const aName, aValue: RawUtf8; aTag: PtrInt);
var
  added: boolean;
  i: PtrInt;
begin
  i := DynArray.FindHashedForAdding(aName, added);
  with List[i] do
  begin
    if added then
      Name := aName;
    Value := aValue;
    Tag := aTag;
  end;
  if Assigned(fOnAdd) then
    fOnAdd(List[i], i);
end;

procedure TSynNameValue.InitFromIniSection(Section: PUtf8Char;
  const OnTheFlyConvert: TOnSynNameValueConvertRawUtf8;
  const OnAdd: TOnSynNameValueNotify);
var
  s: RawUtf8;
  i: PtrInt;
begin
  Init(false);
  fOnAdd := OnAdd;
  while (Section <> nil) and
        (Section^ <> '[') do
  begin
    s := GetNextLine(Section, Section);
    i := PosExChar('=', s);
    if (i > 1) and
       not (s[1] in [';', '[']) then
      if Assigned(OnTheFlyConvert) then
        Add(copy(s, 1, i - 1), OnTheFlyConvert(copy(s, i + 1, 1000)))
      else
        Add(copy(s, 1, i - 1), copy(s, i + 1, 1000));
  end;
end;

procedure TSynNameValue.InitFromCsv(Csv: PUtf8Char; NameValueSep, ItemSep: AnsiChar);
var
  n, v: RawUtf8;
begin
  Init(false);
  while Csv <> nil do
  begin
    GetNextItem(Csv, NameValueSep, n);
    if ItemSep = #10 then
      GetNextItemTrimedCRLF(Csv, v)
    else
      GetNextItem(Csv, ItemSep, v);
    if n = '' then
      break;
    Add(n, v);
  end;
end;

procedure TSynNameValue.InitFromNamesValues(const Names, Values: array of RawUtf8);
var
  i: PtrInt;
begin
  Init(false);
  if high(Names) <> high(Values) then
    exit;
  DynArray.Capacity := length(Names);
  for i := 0 to high(Names) do
    Add(Names[i], Values[i]);
end;

function TSynNameValue.InitFromJson(Json: PUtf8Char; aCaseSensitive: boolean): boolean;
var
  N: PUtf8Char;
  nam, val: RawUtf8;
  Nlen, c: integer;
  info: TGetJsonField;
begin
  result := false;
  Init(aCaseSensitive);
  if Json = nil then
    exit;
  while (Json^ <= ' ') and
        (Json^ <> #0) do
    inc(Json);
  if Json^ <> '{' then
    exit;
  repeat
    inc(Json)
  until (Json^ = #0) or
        (Json^ > ' ');
  info.Json := Json;
  c := JsonObjectPropCount(Json); // fast 900MB/s parsing
  if c <= 0 then
    exit;
  DynArray.Capacity := c;
  repeat
    N := GetJsonPropName(info.Json, @Nlen);
    if N = nil then
      exit;
    info.GetJsonFieldOrObjectOrArray;
    if info.Json = nil then
      exit;
    FastSetString(nam, N, Nlen);
    FastSetString(val, info.Value, info.Valuelen);
    Add(nam, val);
  until info.EndOfObject = '}';
  result := true;
end;

procedure TSynNameValue.Init(aCaseSensitive: boolean);
begin
  // release dynamic arrays memory before FillcharFast()
  List := nil;
  Finalize(PDynArrayHasher(@DynArray.Hasher)^);
  // initialize hashed storage
  FillCharFast(self, SizeOf(self), 0);
  DynArray.InitSpecific(TypeInfo(TSynNameValueItemDynArray), List,
    ptRawUtf8, @Count, not aCaseSensitive);
end;

function TSynNameValue.Find(const aName: RawUtf8): PtrInt;
begin
  result := DynArray.FindHashed(aName);
end;

function TSynNameValue.FindStart(const aUpperName: RawUtf8): PtrInt;
begin
  for result := 0 to Count - 1 do
    if IdemPChar(pointer(List[result].Name), pointer(aUpperName)) then
      exit;
  result := -1;
end;

function TSynNameValue.FindByValue(const aValue: RawUtf8): PtrInt;
begin
  for result := 0 to Count - 1 do
    if List[result].Value = aValue then
      exit;
  result := -1;
end;

function TSynNameValue.Delete(const aName: RawUtf8): boolean;
begin
  result := DynArray.FindHashedAndDelete(aName) >= 0;
end;

function TSynNameValue.DeleteByValue(const aValue: RawUtf8; Limit: integer): integer;
var
  ndx: PtrInt;
begin
  result := 0;
  if Limit < 1 then
    exit;
  for ndx := Count - 1 downto 0 do
    if List[ndx].Value = aValue then
    begin
      DynArray.Delete(ndx);
      inc(result);
      if result >= Limit then
        break;
    end;
  if result > 0 then
    DynArray.ForceReHash;
end;

function TSynNameValue.Value(const aName: RawUtf8; const aDefaultValue: RawUtf8): RawUtf8;
var
  i: PtrInt;
begin
  if @self = nil then
    i := -1
  else
    i := DynArray.FindHashed(aName);
  if i < 0 then
    result := aDefaultValue
  else
    result := List[i].Value;
end;

function TSynNameValue.ValueInt(const aName: RawUtf8; const aDefaultValue: Int64): Int64;
var
  i: PtrInt;
  err: integer;
begin
  i := DynArray.FindHashed(aName);
  if i < 0 then
    result := aDefaultValue
  else
  begin
    result := GetInt64(pointer(List[i].Value), err);
    if err <> 0 then
      result := aDefaultValue;
  end;
end;

function TSynNameValue.ValueBool(const aName: RawUtf8): boolean;
begin
  result := GetBoolean(pointer(Value(aName)));
end;

function TSynNameValue.ValueEnum(const aName: RawUtf8; aEnumTypeInfo: PRttiInfo;
  out aEnum; aEnumDefault: PtrUInt): boolean;
var
  rtti: PRttiEnumType;
  v: RawUtf8;
  err: integer;
  i: PtrInt;
begin
  result := false;
  rtti := aEnumTypeInfo.EnumBaseType;
  if rtti = nil then
    exit;
  RTTI_TO_ORD[rtti.RttiOrd](@aEnum, aEnumDefault); // always set default value
  v := Value(aName, '');
  TrimSelf(v);
  if v = '' then
    exit;
  i := GetInteger(pointer(v), err);
  if (err <> 0) or
     (PtrUInt(i) > PtrUInt(rtti.MaxValue)) then
    i := rtti.GetEnumNameValue(pointer(v), length(v), {alsotrimleft=}true);
  if i >= 0 then
  begin
    RTTI_TO_ORD[rtti.RttiOrd](@aEnum, i); // we found a proper value
    result := true;
  end;
end;

function TSynNameValue.Initialized: boolean;
begin
  result := DynArray.Value = @List;
end;

function TSynNameValue.GetBlobData: RawByteString;
begin
  result := DynArray.SaveTo;
end;

procedure TSynNameValue.SetBlobDataPtr(aValue, aValueMax: pointer);
begin
  DynArray.LoadFrom(aValue, aValueMax);
  DynArray.ForceReHash;
end;

procedure TSynNameValue.SetBlobData(const aValue: RawByteString);
begin
  DynArray.LoadFromBinary(aValue);
  DynArray.ForceReHash;
end;

function TSynNameValue.GetStr(const aName: RawUtf8): RawUtf8;
begin
  result := Value(aName, '');
end;

function TSynNameValue.GetInt(const aName: RawUtf8): Int64;
begin
  result := ValueInt(aName, 0);
end;

function TSynNameValue.AsCsv(const KeySeparator, ValueSeparator, IgnoreKey: RawUtf8): RawUtf8;
var
  i: PtrInt;
  temp: TTextWriterStackBuffer;
begin
  with TTextWriter.CreateOwnedStream(temp) do
  try
    for i := 0 to Count - 1 do
      if (IgnoreKey = '') or
         (List[i].Name <> IgnoreKey) then
      begin
        AddNoJsonEscapeUtf8(List[i].Name);
        AddNoJsonEscapeUtf8(KeySeparator);
        AddNoJsonEscapeUtf8(List[i].Value);
        AddNoJsonEscapeUtf8(ValueSeparator);
      end;
    SetText(result);
  finally
    Free;
  end;
end;

function TSynNameValue.AsJson: RawUtf8;
var
  i: PtrInt;
  temp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(temp) do
  try
    Add('{');
    for i := 0 to Count - 1 do
      with List[i] do
      begin
        AddProp(pointer(Name), length(Name));
        AddDirect('"');
        AddJsonEscape(pointer(Value));
        AddDirect('"', ',');
      end;
    CancelLastComma('}');
    SetText(result);
  finally
    Free;
  end;
end;

procedure TSynNameValue.AsNameValues(out Names, Values: TRawUtf8DynArray);
var
  i: PtrInt;
begin
  SetLength(Names, Count);
  SetLength(Values, Count);
  for i := 0 to Count - 1 do
  begin
    Names[i] := List[i].Name;
    Values[i] := List[i].Value;
  end;
end;

function TSynNameValue.ValueVariantOrNull(const aName: RawUtf8): variant;
var
  i: PtrInt;
begin
  i := Find(aName);
  if i < 0 then
    SetVariantNull(result{%H-})
  else
    RawUtf8ToVariant(List[i].Value, result);
end;

procedure TSynNameValue.AsDocVariant(out DocVariant: variant;
  ExtendedJson, ValueAsString, AllowVarDouble: boolean);
var
  ndx: PtrInt;
  dv: TDocVariantData absolute DocVariant;
begin
  if Count > 0 then
    begin
      dv.Init(JSON_NAMEVALUE[ExtendedJson], dvObject);
      dv.SetCount(Count);
      dv.Capacity := Count;
      for ndx := 0 to Count - 1 do
      begin
        dv.Names[ndx] := List[ndx].Name;
        if ValueAsString or
           not GetVariantFromNotStringJson(pointer(List[ndx].Value),
              TVarData(dv.Values[ndx]), AllowVarDouble) then
          RawUtf8ToVariant(List[ndx].Value, dv.Values[ndx]);
      end;
    end
  else
    TVarData(DocVariant).VType := varNull;
end;

function TSynNameValue.AsDocVariant(ExtendedJson, ValueAsString: boolean): variant;
begin
  AsDocVariant(result, ExtendedJson, ValueAsString);
end;

function TSynNameValue.MergeDocVariant(var DocVariant: variant;
  ValueAsString: boolean; ChangedProps: PVariant; ExtendedJson,
  AllowVarDouble: boolean): integer;
var
  dv: TDocVariantData absolute DocVariant;
  i, ndx: PtrInt;
  v: variant;
  intvalues: TRawUtf8Interning;
begin
  if dv.VarType <> DocVariantVType then
    TDocVariant.New(DocVariant, JSON_NAMEVALUE[ExtendedJson]);
  if ChangedProps <> nil then
    TDocVariant.New(ChangedProps^, dv.Options);
  if dvoInternValues in dv.Options then
    intvalues := DocVariantType.InternValues
  else
    intvalues := nil;
  result := 0; // returns number of changed values
  for i := 0 to Count - 1 do
    if List[i].Name <> '' then
    begin
      VarClear(v{%H-});
      if ValueAsString or
         not GetVariantFromNotStringJson(
            pointer(List[i].Value), TVarData(v), AllowVarDouble) then
        RawUtf8ToVariant(List[i].Value, v);
      ndx := dv.GetValueIndex(List[i].Name);
      if ndx < 0 then
        ndx := dv.InternalAdd(List[i].Name)
      else if FastVarDataComp(@v, @dv.Values[ndx], false) = 0 then
        continue; // value not changed -> skip
      if ChangedProps <> nil then
        PDocVariantData(ChangedProps)^.AddValue(List[i].Name, v);
      SetVariantByValue(v, dv.Values[ndx]);
      if intvalues <> nil then
        intvalues.UniqueVariant(dv.Values[ndx]);
      inc(result);
    end;
end;



{ TSynPersistentStoreJson }

procedure TSynPersistentStoreJson.AddJson(W: TJsonWriter);
begin
  W.AddPropJsonString('name', fName);
end;

function TSynPersistentStoreJson.SaveToJson(reformat: TTextWriterJsonFormat): RawUtf8;
var
  W: TJsonWriter;
begin
  W := TJsonWriter.CreateOwnedStream(65536);
  try
    W.Add('{');
    AddJson(W);
    W.CancelLastComma('}');
    W.SetText(result, reformat);
  finally
    W.Free;
  end;
end;



{ TSynCache }

constructor TSynCache.Create(aMaxCacheRamUsed: cardinal;
  aCaseSensitive: boolean; aTimeoutSeconds: cardinal);
begin
  inherited Create; // may have been overriden
  fNameValue.Init(aCaseSensitive);
  fMaxRamUsed := aMaxCacheRamUsed;
  fTimeoutSeconds := aTimeoutSeconds;
end;

procedure TSynCache.ResetIfNeeded;
var
  tix: cardinal;
begin
  if fRamUsed > fMaxRamUsed then
    Reset;
  if fTimeoutSeconds > 0 then
  begin
    tix := GetTickCount64 shr 10;
    if fTimeoutTix > tix then
      Reset;
    fTimeoutTix := tix + fTimeoutSeconds;
  end;
end;

function TSynCache.Find(const aKey: RawUtf8; aResultTag: PPtrInt): RawUtf8;
var
  ndx: PtrInt;
begin
  result := '';
  if (self = nil) or
     (aKey = '') then
    exit;
  fSafe.ReadOnlyLock;
  {$ifdef HASFASTTRYFINALLY}
  try
  {$else}
  begin
  {$endif HASFASTTRYFINALLY}
    ndx := fNameValue.Find(aKey);
    if ndx >= 0 then
      with fNameValue.List[ndx] do
      begin
        result := Value;
        if aResultTag <> nil then
          aResultTag^ := Tag;
      end;
  {$ifdef HASFASTTRYFINALLY}
  finally
  {$endif HASFASTTRYFINALLY}
    fSafe.ReadOnlyUnLock;
  end;
end;

function TSynCache.AddOrUpdate(const aKey, aValue: RawUtf8; aTag: PtrInt): boolean;
var
  ndx: PtrInt;
begin
  result := false;
  if self = nil then
    exit; // avoid GPF
  fSafe.WriteLock;
  try
    ResetIfNeeded;
    ndx := fNameValue.DynArray.FindHashedForAdding(aKey, result);
    with fNameValue.List[ndx] do
    begin
      Name := aKey;
      dec(fRamUsed, length(Value));
      Value := aValue;
      inc(fRamUsed, length(Value));
      Tag := aTag;
    end;
  finally
    fSafe.WriteUnlock;
  end;
end;

function TSynCache.Reset: boolean;
begin
  result := false;
  if (self = nil) or
     (fNameValue.Count = 0) then
    exit; // avoid GPF or a lock for nothing
  fSafe.WriteLock;
  try
    if fNameValue.Count <> 0 then
    begin
      fNameValue.DynArray.Clear;
      fNameValue.DynArray.ForceReHash;
      result := true; // mark something was flushed
    end;
    fRamUsed := 0;
    fTimeoutTix := 0;
  finally
    fSafe.WriteUnlock;
  end;
end;


{ *********** JSON-aware TSynDictionary Storage }

{ TSynDictionary }

constructor TSynDictionary.Create(aKeyTypeInfo, aValueTypeInfo: PRttiInfo;
  aKeyCaseInsensitive: boolean; aTimeoutSeconds: cardinal;
  aCompressAlgo: TAlgoCompress; aHasher: THasher);
begin
  inherited Create;
  fSafe.Padding[DIC_KEYCOUNT].VType   := varInteger;  // Keys.Count
  fSafe.Padding[DIC_KEY].VType        := varUnknown;  // Key.Value
  fSafe.Padding[DIC_VALUECOUNT].VType := varInteger;  // Values.Count
  fSafe.Padding[DIC_VALUE].VType      := varUnknown;  // Values.Value
  fSafe.Padding[DIC_TIMECOUNT].VType  := varInteger;  // Timeouts.Count
  fSafe.Padding[DIC_TIMESEC].VType    := varInteger;  // Timeouts Seconds
  fSafe.Padding[DIC_TIMETIX].VType    := varInteger;  // GetTickCount64 shr 10
  fSafe.PaddingUsedCount := DIC_TIMETIX + 1;          // manual registration
  fKeys.Init(aKeyTypeInfo, fSafe.Padding[DIC_KEY].VAny, nil, nil, aHasher,
    @fSafe.Padding[DIC_KEYCOUNT].VInteger, aKeyCaseInsensitive);
  fValues.Init(aValueTypeInfo, fSafe.Padding[DIC_VALUE].VAny,
    @fSafe.Padding[DIC_VALUECOUNT].VInteger);
  fValues.Compare := DynArraySortOne(fValues.Info.ArrayFirstField, aKeyCaseInsensitive);
  fTimeouts.Init(TypeInfo(TIntegerDynArray), fTimeOut,
    @fSafe.Padding[DIC_TIMECOUNT].VInteger);
  if aCompressAlgo = nil then
    aCompressAlgo := AlgoSynLZ;
  fCompressAlgo := aCompressAlgo;
  fSafe.Padding[DIC_TIMESEC].VInteger := aTimeoutSeconds;
end;

{$ifdef HASGENERICS}
class function TSynDictionary.New<TKey, TValue>(aKeyCaseInsensitive: boolean;
  aTimeoutSeconds: cardinal; aCompressAlgo: TAlgoCompress;
  aHasher: THasher): TSynDictionary;
begin
  result := TSynDictionary.Create(TypeInfo(TArray<TKey>), TypeInfo(TArray<TValue>),
    aKeyCaseInsensitive, aTimeoutSeconds, aCompressAlgo, aHasher);
end;
{$endif HASGENERICS}

function TSynDictionary.ComputeNextTimeOut: cardinal;
begin
  result := fSafe.Padding[DIC_TIMESEC].VInteger;
  if result <> 0 then
    result := cardinal(GetTickCount64 shr 10) + result;
end;

function TSynDictionary.GetCapacity: integer;
begin
  result := fKeys.Capacity; // no need to lock for an evolving value
end;

procedure TSynDictionary.SetCapacity(const Value: integer);
begin
  fSafe.Lock; // = RWLock(cWrite);
  try
    fKeys.Capacity := Value;
    fValues.Capacity := Value;
    if fSafe.Padding[DIC_TIMESEC].VInteger > 0 then
      fTimeOuts.Capacity := Value;
  finally
    fSafe.UnLock;
  end;
end;

function TSynDictionary.GetTimeOutSeconds: cardinal;
begin
  result := fSafe.Padding[DIC_TIMESEC].VInteger;
end;

procedure TSynDictionary.SetTimeOutSeconds(Value: cardinal);
begin
  // no fSafe.Lock because RWLock(cWrite) in DeleteAll is enough
  DeleteAll;
  fSafe.Padding[DIC_TIMESEC].VInteger := Value;
end;

procedure TSynDictionary.SetTimeouts;
var
  i: PtrInt;
  timeout: cardinal;
begin
  if fSafe.Padding[DIC_TIMESEC].VInteger = 0 then
    exit;
  fTimeOuts.Count := fSafe.Padding[DIC_KEYCOUNT].VInteger;
  timeout := ComputeNextTimeOut;
  for i := 0 to fSafe.Padding[DIC_TIMECOUNT].VInteger - 1 do
    fTimeOut[i] := timeout;
end;

function TSynDictionary.DeleteDeprecated(tix64: Int64): integer;
var
  i: PtrInt;
  now: cardinal;
begin
  result := 0;
  if (self = nil) or
     (fSafe.Padding[DIC_TIMECOUNT].VInteger = 0) or // no entry
     (fSafe.Padding[DIC_TIMESEC].VInteger = 0) then // nothing in fTimeOut[]
    exit;
  if tix64 = 0 then
    tix64 := GetTickCount64;
  now := tix64 shr 10;
  if fSafe.Padding[DIC_TIMETIX].VInteger = integer(now) then
    exit; // no need to search more often than every second
  fSafe.ReadWriteLock; // would upgrade to cWrite only if needed
  try
    fSafe.Padding[DIC_TIMETIX].VInteger := now;
    for i := fSafe.Padding[DIC_TIMECOUNT].VInteger - 1 downto 0 do
      if (now > fTimeOut[i]) and
         (fTimeOut[i] <> 0) and
         (not Assigned(fOnCanDelete) or
          fOnCanDelete(fKeys.ItemPtr(i)^, fValues.ItemPtr(i)^, i)) then
      begin
        if result = 0 then
          fSafe.Lock; // = cWrite
        fKeys.Delete(i);
        fValues.Delete(i);
        fTimeOuts.Delete(i);
        inc(result);
      end;
    if result > 0 then
      fKeys.ForceReHash; // mandatory after manual fKeys.Delete(i)
  finally
    if result > 0 then
      fSafe.UnLock; // = cWrite
    fSafe.ReadWriteUnLock;
  end;
end;

procedure TSynDictionary.DeleteAll;
begin
  if self = nil then
    exit;
  fSafe.Lock; // = RWLock(cWrite);
  try
    fKeys.Clear;
    fKeys.Hasher.ForceReHash(nil); // mandatory to avoid GPF
    fValues.Clear;
    if fSafe.Padding[DIC_TIMESEC].VInteger > 0 then
      fTimeOuts.Clear;
  finally
    fSafe.UnLock;
  end;
end;

destructor TSynDictionary.Destroy;
begin
  fKeys.Clear;
  fValues.Clear;
  inherited Destroy;
end;

function TSynDictionary.GetThreadUse: TSynLockerUse;
begin
  result := fSafe^.RWUse;
end;

procedure TSynDictionary.SetThreadUse(const Value: TSynLockerUse);
begin
  fSafe^.RWUse := Value;
end;

function TSynDictionary.InternalAddUpdate(
  aKey, aValue: pointer; aUpdate: boolean): PtrInt;
var
  added: boolean;
  tim: cardinal;
begin
  tim := ComputeNextTimeOut;
  fSafe.Lock; // = RWLock(cWrite) - cReadWrite is not possible here
  try
    result := fKeys.FindHashedForAdding(aKey^, added);
    if added then
    begin // fKey[result] := aKey;
      with fKeys{$ifdef UNDIRECTDYNARRAY}.InternalDynArray{$endif} do
        ItemCopy(aKey, PAnsiChar(Value^) + (result * Info.Cache.ItemSize));
      if fValues.Add(aValue^) <> result then
        raise ESynDictionary.CreateUtf8('%.Add fValues.Add', [self]);
      if tim <> 0 then
        fTimeOuts.Add(tim);
    end
    else if aUpdate then
    begin
      fValues.ItemCopyFrom(aValue, result, {ClearBeforeCopy=}true);
      if tim <> 0 then
        fTimeOut[result] := tim;
    end
    else
      result := -1;
  finally
    fSafe.UnLock;
  end;
end;

function TSynDictionary.Add(const aKey, aValue): PtrInt;
begin
  result := InternalAddUpdate(@aKey, @aValue, {update=}false)
end;

function TSynDictionary.AddOrUpdate(const aKey, aValue): PtrInt;
begin
  result := InternalAddUpdate(@aKey, @aValue, {update=}true)
end;

function TSynDictionary.Clear(const aKey): PtrInt;
begin
  fSafe.ReadWriteLock;
  try
    result := fKeys.FindHashed(aKey);
    if result >= 0 then
    begin
      fSafe.Lock;
      fValues.ItemClear(fValues.ItemPtr(result));
      if fSafe.Padding[DIC_TIMESEC].VInteger > 0 then
        fTimeOut[result] := 0;
      fSafe.UnLock;
    end;
  finally
    fSafe.ReadWriteUnLock;
  end;
end;

function TSynDictionary.Delete(const aKey): PtrInt;
begin
  fSafe.Lock;
  try
    result := fKeys.FindHashedAndDelete(aKey);
    if result >= 0 then
    begin
      fValues.Delete(result);
      if fSafe.Padding[DIC_TIMESEC].VInteger > 0 then
        fTimeOuts.Delete(result);
    end;
  finally
    fSafe.UnLock;
  end;
end;

function TSynDictionary.DeleteAt(aIndex: PtrInt): boolean;
begin
  if cardinal(aIndex) < cardinal(fSafe.Padding[DIC_KEYCOUNT].VInteger) then
    // use Delete(aKey) to have efficient hash table update
    result := Delete(fKeys.ItemPtr(aIndex)^) = aIndex
  else
    result := false;
end;

function TSynDictionary.InArray(const aKey, aArrayValue;
  aAction: TSynDictionaryInArray; aCompare: TDynArraySortCompare): boolean;
var
  nested: TDynArray;
  ndx: PtrInt;
  new: pointer;
begin
  result := false;
  if (fValues.Info.ArrayRtti = nil) or
     (fValues.Info.ArrayRtti.Kind <> rkDynArray) then
    raise ESynDictionary.CreateUtf8('%.Values: % items are not dynamic arrays',
      [self, fValues.Info.Name]);
  if aAction = iaFind then
    fSafe.ReadLock
  else
    fSafe.Lock; // other actions may need to write the internal data
  try
    ndx := fKeys.FindHashed(aKey);
    if ndx < 0 then
      if aAction <> iaAddForced then
        exit
      else
      begin
        new := nil;
        ndx := Add(aKey, new);
      end;
    nested.InitRtti(fValues.Info.ArrayRtti, fValues.ItemPtr(ndx)^);
    nested.Compare := aCompare;
    case aAction of
      iaFind:
        result := nested.Find(aArrayValue) >= 0;
      iaFindAndDelete:
        result := nested.FindAndDelete(aArrayValue) >= 0;
      iaFindAndUpdate:
        result := nested.FindAndUpdate(aArrayValue) >= 0;
      iaFindAndAddIfNotExisting:
        result := nested.FindAndAddIfNotExisting(aArrayValue) >= 0;
      iaAdd,
      iaAddForced:
        result := nested.Add(aArrayValue) >= 0;
    end;
  finally
    if aAction = iaFind then
      fSafe.ReadUnLock
    else
      fSafe.UnLock;
  end;
end;

function TSynDictionary.FindInArray(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaFind, aCompare);
end;

function TSynDictionary.FindKeyFromValue(const aValue;
  out aKey; aUpdateTimeOut: boolean): boolean;
var
  ndx: PtrInt;
begin
  fSafe.ReadLock; // cReadOnly is good enough for SetTimeoutAtIndex()
  try
    ndx := fValues.IndexOf(aValue); // use fast RTTI for value search
    result := ndx >= 0;
    if result then
    begin
      fKeys.ItemCopyAt(ndx, @aKey);
      if aUpdateTimeOut then
        SetTimeoutAtIndex(ndx); // no cWrite lock needed
    end;
  finally
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.DeleteInArray(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaFindAndDelete, aCompare);
end;

function TSynDictionary.UpdateInArray(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaFindAndUpdate, aCompare);
end;

function TSynDictionary.AddInArray(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaAdd, aCompare);
end;

function TSynDictionary.AddInArrayForced(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaAddForced, aCompare);
end;

function TSynDictionary.AddOnceInArray(const aKey, aArrayValue;
  aCompare: TDynArraySortCompare): boolean;
begin
  result := InArray(aKey, aArrayValue, iaFindAndAddIfNotExisting, aCompare);
end;

function TSynDictionary.Find(const aKey; aUpdateTimeOut: boolean): PtrInt;
var
  tim: cardinal;
begin
  // caller is expected to call fSafe.Lock/Unlock
  if self = nil then
    result := -1
  else
  begin
    result := fKeys.Hasher.FindOrNew(fKeys.Hasher.HashOne(@aKey), @aKey, nil);
    if result < 0 then
      result := -1
    else if aUpdateTimeOut then
    begin
      tim := fSafe.Padding[DIC_TIMESEC].VInteger;
      if tim > 0 then // inlined fTimeout[result] := GetTimeout
        fTimeout[result] := cardinal(GetTickCount64 shr 10) + tim;
    end;
  end;
end;

function TSynDictionary.FindValue(const aKey; aUpdateTimeOut: boolean;
  aIndex: PPtrInt): pointer;
var
  ndx: PtrInt;
begin
  ndx := Find(aKey, aUpdateTimeOut);
  if aIndex <> nil then
    aIndex^ := ndx;
  if ndx < 0 then
    result := nil
  else
    result := PAnsiChar(fValues.Value^) + ndx * fValues.Info.Cache.ItemSize;
end;

function TSynDictionary.FindValueOrAdd(const aKey; var added: boolean;
  aIndex: PPtrInt): pointer;
var
  ndx: PtrInt;
  tim: cardinal;
begin
  tim := fSafe.Padding[DIC_TIMESEC].VInteger; // inlined tim := GetTimeout
  if tim <> 0 then
    tim := cardinal(GetTickCount64 shr 10) + tim;
  ndx := fKeys.FindHashedForAdding(aKey, added);
  if added then
  begin
    fKeys{$ifdef UNDIRECTDYNARRAY}.InternalDynArray{$endif}.
      ItemCopyFrom(@aKey, ndx); // fKey[i] := aKey
    fValues.Count := ndx + 1; // reserve new place for associated value
    if tim > 0 then
      fTimeOuts.Add(tim);
  end
  else if tim > 0 then
    fTimeOut[ndx] := tim;
  if aIndex <> nil then
    aIndex^ := ndx;
  result := PAnsiChar(fValues.Value^) + ndx * fValues.Info.Cache.ItemSize;
end;

function TSynDictionary.FindAndCopy(const aKey;
  var aValue; aUpdateTimeOut: boolean): boolean;
var
  ndx: PtrInt;
begin
  result := false;
  if self = nil then
    exit;
  fSafe.ReadLock;
  {$ifdef HASFASTTRYFINALLY}
  try
  {$else}
  begin
  {$endif HASFASTTRYFINALLY}
    ndx := Find(aKey, aUpdateTimeOut);
    if ndx >= 0 then
    begin
      fValues.ItemCopy( // inlined ItemCopyAt(ndx, @aValue)
        PAnsiChar(fValues.Value^) + ndx * fValues.Info.Cache.ItemSize, @aValue);
      result := true;
    end;
  {$ifdef HASFASTTRYFINALLY}
  finally
  {$endif HASFASTTRYFINALLY}
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.FindAndGetElapsedSeconds(const aKey): integer;
var
  tim: cardinal;
  ndx: PtrInt;
begin
  result := -1;
  if self = nil then
    exit;
  tim := ComputeNextTimeOut;
  if tim = 0 then
    exit;
  fSafe.ReadLock;
  try
    ndx := Find(aKey, {aUpdateTimeOut=}false);
    if ndx >= 0 then
      result := tim - fTimeOut[ndx];
  finally
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.FindAndDeleteDeprecated(const aKey; aSeconds: integer): boolean;
var
  tim: cardinal;
  ndx: PtrInt;
begin
  result := false;
  if (self = nil) or
     (aSeconds <= 0) then
    exit;
  tim := ComputeNextTimeOut;
  if tim = 0 then
    exit;
  fSafe.ReadWriteLock;
  try
    ndx := Find(aKey, {aUpdateTimeOut=}false);
    if (ndx >= 0) and
       (tim - fTimeOut[ndx] > cardinal(aSeconds)) then
      result := DeleteAt(ndx);
  finally
    fSafe.ReadWriteUnLock;
  end;
end;

function TSynDictionary.FindAndExtract(const aKey; var aValue): boolean;
var
  ndx: PtrInt;
begin
  result := false;
  if self = nil then
    exit;
  fSafe.ReadWriteLock;
  try
    ndx := fKeys.FindHashedAndDelete(aKey);
    if ndx >= 0 then
    begin
      fSafe.Lock;
      fValues.ItemMoveTo(ndx, @aValue); // faster than ItemCopy()
      fValues.Delete(ndx);
      if fSafe.Padding[DIC_TIMESEC].VInteger > 0 then
        fTimeOuts.Delete(ndx);
      fSafe.UnLock;
      result := true;
    end;
  finally
    fSafe.ReadWriteUnLock;
  end;
end;

function TSynDictionary.Exists(const aKey): boolean;
begin
  result := false;
  if self = nil then
    exit;
  fSafe.ReadLock;
  {$ifdef HASFASTTRYFINALLY}
  try
  {$else}
  begin
  {$endif HASFASTTRYFINALLY}
    result := fKeys.FindHashed(aKey) >= 0;
  {$ifdef HASFASTTRYFINALLY}
  finally
  {$endif HASFASTTRYFINALLY}
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.ExistsValue(
  const aValue; aCompare: TDynArraySortCompare): boolean;
begin
  result := false;
  if self = nil then
    exit;
  fSafe.ReadLock;
  try
    result := fValues.Find(aValue, aCompare) >= 0;
  finally
    fSafe.ReadUnLock;
  end;
end;

procedure TSynDictionary.CopyValues(out Dest; ObjArrayByRef: boolean);
begin
  fSafe.ReadLock;
  try
    fValues.CopyTo(Dest, ObjArrayByRef);
  finally
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.ForEach(const OnEach: TOnSynDictionary;
  Opaque: pointer; MayModify: boolean): integer;
var
  k, v: PAnsiChar;
  i, n, ks, vs: PtrInt;
begin
  result := 0;
  if MayModify then
    fSafe.ReadWriteLock
  else
    fSafe.ReadLock;
  try
    n := fSafe.Padding[DIC_KEYCOUNT].VInteger;
    if (n = 0) or
       (not Assigned(OnEach)) then
      exit;
    k := fKeys.Value^;
    ks := fKeys.Info.Cache.ItemSize;
    v := fValues.Value^;
    vs := fValues.Info.Cache.ItemSize;
    for i := 0 to n - 1 do
    begin
      inc(result);
      if not OnEach(k^, v^, i, n, Opaque) then
        break;
      inc(k, ks);
      inc(v, vs);
    end;
  finally
    if MayModify then
      fSafe.ReadWriteUnLock
    else
      fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.ForEach(const OnMatch: TOnSynDictionary;
  KeyCompare, ValueCompare: TDynArraySortCompare; const aKey, aValue;
  Opaque: pointer; MayModify: boolean): integer;
var
  k, v: PAnsiChar;
  i, n, ks, vs: PtrInt;
begin
  if MayModify then
    fSafe.ReadWriteLock
  else
    fSafe.ReadLock;
  try
    result := 0;
    if (not Assigned(OnMatch)) or
       (not (Assigned(KeyCompare) or
             Assigned(ValueCompare))) then
      exit;
    n := fSafe.Padding[DIC_KEYCOUNT].VInteger;
    k := fKeys.Value^;
    ks := fKeys.Info.Cache.ItemSize;
    v := fValues.Value^;
    vs := fValues.Info.Cache.ItemSize;
    for i := 0 to n - 1 do
    begin
      if (Assigned(KeyCompare) and
          (KeyCompare(k^, aKey) = 0)) or
         (Assigned(ValueCompare) and
          (ValueCompare(v^, aValue) = 0)) then
      begin
        inc(result);
        if not OnMatch(k^, v^, i, n, Opaque) then
          break;
      end;
      inc(k, ks);
      inc(v, vs);
    end;
  finally
    if MayModify then
      fSafe.ReadWriteUnLock
    else
      fSafe.ReadUnLock;
  end;
end;

procedure TSynDictionary.SetTimeoutAtIndex(aIndex: PtrInt);
var
  tim: cardinal;
begin
  if cardinal(aIndex) >= cardinal(fSafe.Padding[DIC_KEYCOUNT].VInteger) then
    exit;
  tim := fSafe.Padding[DIC_TIMESEC].VInteger;
  if tim > 0 then
    fTimeOut[aIndex] := cardinal(GetTickCount64 shr 10) + tim;
end;

function TSynDictionary.Count: integer;
begin
  result := fSafe.Padding[DIC_KEYCOUNT].VInteger;
end;

procedure TSynDictionary.SaveToJson(W: TJsonWriter; EnumSetsAsText: boolean);
var
  k, v: RawUtf8;
begin
  fSafe.ReadLock;
  try
    if fSafe.Padding[DIC_KEYCOUNT].VInteger > 0 then
    begin
      fKeys{$ifdef UNDIRECTDYNARRAY}.InternalDynArray{$endif}.
        SaveToJson(k, EnumSetsAsText);
      fValues.SaveToJson(v, EnumSetsAsText);
    end;
  finally
    fSafe.ReadUnLock;
  end;
  W.AddJsonArraysAsJsonObject(pointer(k), pointer(v));
end;

function TSynDictionary.SaveToJson(EnumSetsAsText: boolean): RawUtf8;
var
  W: TJsonWriter;
  temp: TTextWriterStackBuffer;
begin
  W := TJsonWriter.CreateOwnedStream(temp) as TJsonWriter;
  try
    SaveToJson(W, EnumSetsAsText);
    W.SetText(result);
  finally
    W.Free;
  end;
end;

function TSynDictionary.SaveValuesToJson(EnumSetsAsText: boolean;
  ReFormat: TTextWriterJsonFormat): RawUtf8;
begin
  if self = nil then
  begin
    result := '';
    exit;
  end;
  fSafe.ReadLock;
  try
    fValues.SaveToJson(result, EnumSetsAsText, ReFormat);
  finally
    fSafe.ReadUnLock;
  end;
end;

function TSynDictionary.LoadFromJson(const Json: RawUtf8;
  CustomVariantOptions: PDocVariantOptions): boolean;
begin
  // pointer(Json) is not modified in-place thanks to JsonObjectAsJsonArrays()
  result := LoadFromJson(pointer(Json), CustomVariantOptions);
end;

function TSynDictionary.LoadFromJson(Json: PUtf8Char;
  CustomVariantOptions: PDocVariantOptions): boolean;
var
  k, v: RawUtf8; // private copy of the Json input, expanded as Keys/Values arrays
  n: integer;
begin
  result := false;
  n := JsonObjectAsJsonArrays(Json, k, v);
  if n <= 0 then
    exit;
  fSafe.Lock;
  try
    if (fKeys.LoadFromJson(pointer(k), nil, CustomVariantOptions) <> nil) and
       (fKeys.Count = n) and
       (fValues.LoadFromJson(pointer(v), nil, CustomVariantOptions) <> nil) and
       (fValues.Count = n) then
      begin
        SetTimeouts;
        fKeys.ForceRehash; // warning: duplicated keys won't be identified
        result := true;
      end;
  finally
    fSafe.UnLock;
  end;
end;

function TSynDictionary.LoadFromBinary(const binary: RawByteString): boolean;
var
  plain: RawByteString;
  rdr: TFastReader;
  n: integer;
begin
  result := false;
  plain := fCompressAlgo.Decompress(binary);
  if plain = '' then
    exit;
  rdr.Init(plain);
  fSafe.Lock;
  try
    try
      RTTI_BINARYLOAD[rkDynArray](fKeys.Value,   rdr, fKeys.Info.Info);
      RTTI_BINARYLOAD[rkDynArray](fValues.Value, rdr, fValues.Info.Info);
      n := fKeys.Capacity;
      if n = fValues.Capacity then
      begin
        // RTTI_BINARYLOAD[rkDynArray]() did not set the external count
        fSafe.Padding[DIC_KEYCOUNT].VInteger   := n;
        fSafe.Padding[DIC_VALUECOUNT].VInteger := n;
        SetTimeouts;  // set ComputeNextTimeOut for all items
        fKeys.ForceReHash; // optimistic: input from TSynDictionary.SaveToBinary
        result := true;
      end;
    except
      result := false;
    end;
  finally
    fSafe.UnLock;
  end;
end;

class function TSynDictionary.OnCanDeleteSynPersistentLock(
  const aKey, aValue; aIndex: PtrInt): boolean;
begin
  result := not TSynPersistentLock(aValue).Safe^.IsLocked;
end;

{$ifndef PUREMORMOT2}
class function TSynDictionary.OnCanDeleteSynPersistentLocked(
  const aKey, aValue; aIndex: PtrInt): boolean;
begin
  result := not TSynPersistentLocked(aValue).Safe^.IsLocked;
end;
{$endif PUREMORMOT2}

function TSynDictionary.SaveToBinary(
  NoCompression: boolean; Algo: TAlgoCompress): RawByteString;
var
  tmp: TTextWriterStackBuffer;
  W: TBufferWriter;
begin
  result := '';
  if fSafe.Padding[DIC_KEYCOUNT].VInteger = 0 then
    exit;
  W := TBufferWriter.Create(tmp{%H-});
  try
    fSafe.ReadLock;
    try
      if fSafe.Padding[DIC_KEYCOUNT].VInteger = 0 then
        exit;
      DynArraySave(pointer(fKeys.Value),
        @fSafe.Padding[DIC_KEYCOUNT].VInteger, W, fKeys.Info.Info);
      DynArraySave(pointer(fValues.Value),
        @fSafe.Padding[DIC_VALUECOUNT].VInteger, W, fValues.Info.Info);
    finally
      fSafe.ReadUnLock;
    end;
    result := W.FlushAndCompress(NoCompression, Algo);
  finally
    W.Free;
  end;
end;



{ ********** Custom JSON Serialization }

{ TRttiJson }

function _New_ObjectList(Rtti: TRttiCustom): pointer;
begin
  result := TObjectListClass(Rtti.ValueClass).Create;
end;

function _New_InterfacedObjectWithCustomCreate(Rtti: TRttiCustom): pointer;
begin
  result := TInterfacedObjectWithCustomCreateClass(Rtti.ValueClass).Create;
end;

function _New_PersistentWithCustomCreate(Rtti: TRttiCustom): pointer;
begin
  result := TPersistentWithCustomCreateClass(Rtti.ValueClass).Create;
end;

function _New_Component(Rtti: TRttiCustom): pointer;
begin
  result := TComponentClass(Rtti.ValueClass).Create(nil);
end;

function _New_ObjectWithCustomCreate(Rtti: TRttiCustom): pointer;
begin
  result := TObjectWithCustomCreateClass(Rtti.ValueClass).Create;
end;

function _New_SynObjectList(Rtti: TRttiCustom): pointer;
begin
  result := TSynObjectListClass(Rtti.ValueClass).Create({ownobjects=}true);
end;

function _New_SynLocked(Rtti: TRttiCustom): pointer;
begin
  result := TSynLockedClass(Rtti.ValueClass).Create;
end;

function _New_InterfacedCollection(Rtti: TRttiCustom): pointer;
begin
  result := TInterfacedCollectionClass(Rtti.ValueClass).Create;
end;

function _New_Collection(Rtti: TRttiCustom): pointer;
begin
  if Rtti.CollectionItem = nil then
    raise ERttiException.CreateUtf8('% with CollectionItem=nil: please call ' +
      'Rtti.RegisterCollection()', [Rtti.ValueClass]);
  result := TCollectionClass(Rtti.ValueClass).Create(Rtti.CollectionItem);
end;

function _New_CollectionItem(Rtti: TRttiCustom): pointer;
begin
  result := TCollectionItemClass(Rtti.ValueClass).Create(nil);
end;

function _New_List(Rtti: TRttiCustom): pointer;
begin
  result := TListClass(Rtti.ValueClass).Create;
end;

function _New_Object(Rtti: TRttiCustom): pointer;
begin
  result := Rtti.ValueClass.Create; // non-virtual TObject.Create constructor
end;

function _BC_RawByteString(A, B: PPUtf8Char; Info: PRttiInfo;
  out Compared: integer): PtrInt;
begin
  {$ifdef CPUINTEL}
  compared := SortDynArrayAnsiString(A^, B^); // i386/x86_64 asm uses length
  {$else}
  compared := SortDynArrayRawByteString(A^, B^); // will use length not #0
  {$endif CPUINTEL}
  result := SizeOf(pointer);
end;

function _BC_PUtf8Char(A, B: PPUtf8Char; Info: PRttiInfo; out Compared: integer): PtrInt;
begin
  compared := StrComp(A^, B^);
  result := SizeOf(pointer);
end;

function _BCI_PUtf8Char(A, B: PPUtf8Char; Info: PRttiInfo; out Compared: integer): PtrInt;
begin
  compared := StrIComp(A^, B^);
  result := SizeOf(pointer);
end;

function _BC_Default(A, B: pointer; Info: PRttiInfo; out Compared: integer): PtrInt;
begin
  Compared := ComparePointer(A, B); // weak fallback
  result := 0; // not used in TRttiJson.ValueCompare / fCompare[]
end;

function TRttiJson.SetParserType(aParser: TRttiParserType;
  aParserComplex: TRttiParserComplexType): TRttiCustom;
var
  C: TClass;
  n: integer;
begin
  // set Name and Flags from Props[]
  inherited SetParserType(aParser, aParserComplex);
  // set comparison functions
  fCompare[true]  := RTTI_COMPARE[true][Kind];  // generic comparison
  fCompare[false] := RTTI_COMPARE[false][Kind];
  if rcfHasRttiOrd in fCache.Flags then
  begin
    fCompare[true]  := @RTTI_ORD_COMPARE[fCache.RttiOrd]; // tuned compare
    fCompare[false] := fCompare[true];
  end
  else if rcfGetInt64Prop in fCache.Flags then
  begin
    if rcfQWord in fCache.Flags then
      fCompare[true] := @_BC_UQWord  // QWord compare
    else
      fCompare[true] := @_BC_SQWord; // Int64 compare
    fCompare[false] := fCompare[true];
  end
  else if Kind = rkFloat then
  begin
    fCompare[true]  := @RTTI_FLOAT_COMPARE[fCache.RttiFloat]; // tuned compare
    fCompare[false] := fCompare[true];
  end
  else if rcfObjArray in fFlags then
  begin
    fCompare[true]  := _BCI_ObjArray; // direct compare
    fCompare[false] := _BC_ObjArray;
  end
  else if aParser = ptPUtf8Char then
  begin
    fCompare[true]  := @_BCI_PUtf8Char; // rkPointer with no RTTI
    fCompare[false] := @_BC_PUtf8Char;
  end
  else if Kind = rkLString then // override default StrComp/StrIComp
    if Cache.CodePage >= CP_RAWBLOB then
    begin
      fCompare[true]  := @_BC_RawByteString; // ignore #0 or CaseInsensitive
      fCompare[false] := @_BC_RawByteString;
    end
    else if Cache.CodePage = CP_UTF16 then
    begin
      fCompare[true]  := RTTI_COMPARE[true][rkWString];  // StrCompW
      fCompare[false] := RTTI_COMPARE[false][rkWString]; // StrICompW
    end;
  if not Assigned(fCompare[true]) then
  begin
    // fallback to ComparePointer(A, B) if not enough RTTI
    fCompare[true] := @_BC_Default;
    fCompare[false] := @_BC_Default;
  end;
  // set class serialization and initialization
  if aParser = ptClass then
  begin
    // default JSON serialization of published props
    fJsonSave := @_JS_RttiCustom;
    fJsonLoad := @_JL_RttiCustom;
    // prepare efficient ClassNewInstance() and recognize most parents
    C := fValueClass;
    repeat
      if C = TObjectList then // any branch taken will break below
      begin
        fNewInstance := @_New_ObjectList;
        fJsonSave := @_JS_TObjectList;
        fJsonLoad := @_JL_TObjectList;
      end
      else if C = TInterfacedObjectWithCustomCreate then
        fNewInstance := @_New_InterfacedObjectWithCustomCreate
      else if C = TPersistentWithCustomCreate then
        fNewInstance := @_New_PersistentWithCustomCreate
      else if C = TObjectWithCustomCreate then
      begin
        fNewInstance := @_New_ObjectWithCustomCreate;
        // allow any kind of customization for TObjectWithCustomCreate children
        // - is used e.g. by TOrm or TObjectWithID
        n := Props.Count;
        TObjectWithCustomCreateRttiCustomSetParser(
          TObjectWithCustomCreateClass(fValueClass), self);
        if n <> Props.Count then
          fFlags := fFlags + fProps.AdjustAfterAdded; // added a prop
      end
      else if C = TSynObjectList then
      begin
        fNewInstance := @_New_SynObjectList;
        fJsonSave := @_JS_TSynObjectList;
        fJsonLoad := @_JL_TSynObjectList;
      end
      else if C = TSynLocked then
        fNewInstance := @_New_SynLocked
      else if C = TComponent then
        fNewInstance := @_New_Component
      else if C = TInterfacedCollection then
      begin
        if fValueClass <> C then
        begin
          fCollectionItem := TInterfacedCollectionClass(fValueClass).GetClass;
          fCollectionItemRtti := Rtti.RegisterClass(fCollectionItem);
        end;
        fNewInstance := @_New_InterfacedCollection;
        fJsonSave := @_JS_TCollection;
        fJsonLoad := @_JL_TCollection;
      end
      else if C = TCollection then
      begin
        fNewInstance := @_New_Collection;
        fJsonSave := @_JS_TCollection;
        fJsonLoad := @_JL_TCollection;
      end
      else if C = TCollectionItem then
        fNewInstance := @_New_CollectionItem
      else if C = TList then
        fNewInstance := @_New_List
      else if C = TObject then
        fNewInstance := @_New_Object
      else
      begin
        // customize JSON serialization
        if C = TSynList then
          fJsonSave := @_JS_TSynList
        else if C = TObjectWithID then
          fJsonLoad := @_JL_RttiObjectWithID; // also accepts "RowID" field
        C := C.ClassParent; // continue with the parent class
        continue;
      end;
      break; // we reached the root supported class
    until false;
    case fValueRtlClass of
      vcStrings:
        begin
          fJsonSave := @_JS_TStrings;
          fJsonLoad := @_JL_TStrings;
        end;
      vcList:
        fJsonSave := @_JS_TList;
      vcRawUtf8List:
        begin
          fJsonSave := @_JS_TRawUtf8List;
          fJsonLoad := @_JL_TRawUtf8List;
        end;
    end;
  end
  else if rcfBinary in Flags then
  begin
    fJsonSave := @_JS_Binary;
    fJsonLoad := @_JL_Binary;
  end
  else
  case Kind of
    rkChar:
      begin
        fJsonSave := @_JS_Char;
        fJsonLoad := @_JL_Char;
        include(fFlags, rcfJsonString);
      end;
    rkWChar {$ifdef FPC}, rkUChar {$endif}:
      begin
        fJsonSave := @_JS_WideChar;
        fJsonLoad := @_JL_WideChar;
        include(fFlags, rcfJsonString);
      end;
  else
    begin
      // default well-known serialization
      fJsonSave := PTC_JSONSAVE[aParserComplex];
      if not Assigned(fJsonSave) then
        fJsonSave := PT_JSONSAVE[aParser];
      fJsonLoad := PT_JSONLOAD[aParser];
      // rkRecordTypes serialization with proper fields RTTI
      if (not Assigned(fJsonSave)) and
         (Flags * [rcfWithoutRtti, rcfHasNestedProperties] <> []) then
        fJsonSave := @_JS_RttiCustom;
     if (not Assigned(fJsonLoad)) and
        (Flags * [rcfWithoutRtti, rcfHasNestedProperties] <> []) then
      fJsonLoad := @_JL_RttiCustom
    end;
  end;
  // TRttiJson.RegisterCustomSerializer() custom callbacks have priority
  if Assigned(fJsonWriter.Code) then
    fJsonSave := @_JS_RttiCustom;
  if Assigned(fJsonReader.Code) then
    fJsonLoad := @_JL_RttiCustom;
  result := self;
end;

procedure TRttiJson.SetValueClass(aClass: TClass; aInfo: PRttiInfo);
begin
  inherited SetValueClass(aClass, aInfo);
  if aClass.InheritsFrom(TSynList) then
    fValueRtlClass := vcSynList
  else if aClass.InheritsFrom(TRawUtf8List) then
    fValueRtlClass := vcRawUtf8List;
end;

function TRttiJson.ParseNewInstance(var Context: TJsonParserContext): TObject;
begin
  result := fNewInstance(self);
  TRttiJsonLoad(fJsonLoad)(@result, Context);
  if not Context.Valid then
    FreeAndNil(result);
end;

function TRttiJson.ValueCompare(Data, Other: pointer; CaseInsensitive: boolean): integer;
begin
  fCompare[CaseInsensitive](Data, Other, Info, result); // at least _BC_Default
end;

function TRttiJson.ValueToVariant(Data: pointer; out Dest: TVarData;
  Options: pointer{PDocVariantOptions}): PtrInt;
var
  tmp: pointer;
  vt: cardinal;
  ctx: TGetJsonField;
begin
  // see TRttiCustomProp.GetValueDirect
  vt := Cache.VarDataVType;
  TRttiVarData(Dest).VType := vt;
  case vt of
    varInt64,
    varBoolean:
      // rkInteger,rkBool,rkEnumeration,rkSet using VInt64 for unsigned 32-bit
      Dest.VInt64 := RTTI_FROM_ORD[Cache.RttiOrd](Data);
    varWord64:
      // rkInt64, rkQWord
      begin
        if not (rcfQWord in Cache.Flags) then
          TRttiVarData(Dest).VType := varInt64; // fix VType
        Dest.VInt64 := PInt64(Data)^;
      end;
    varSingle:
      Dest.VInteger := PInteger(Data)^;
    varDate,
    varDouble,
    varCurrency:
      Dest.VInt64 := PInt64(Data)^;
    varString:
      // rkString
      begin
        Dest.VAny := nil; // avoid GPF
        RawByteString(Dest.VAny) := PRawByteString(Data)^;
      end;
    varOleStr:
      // rkWString
      begin
        Dest.VAny := nil; // avoid GPF
        WideString(Dest.VAny) := PWideString(Data)^;
      end;
    {$ifdef HASVARUSTRING}
    varUString:
      // rkUString
      begin
        Dest.VAny := nil; // avoid GPF
        UnicodeString(Dest.VAny) := PUnicodeString(Data)^;
      end;
    {$endif HASVARUSTRING}
    varVariant:
      // rkVariant
      SetVariantByValue(PVariant(Data)^, PVariant(@Dest)^);
    varUnknown:
      // rkChar, rkWChar, rkSString converted into temporary RawUtf8
      begin
        TRttiVarData(Dest).VType := varString;
        Dest.VAny := nil; // avoid GPF
        Info.StringToUtf8(Data, RawUtf8(Dest.VAny));
      end;
   else
     begin
       tmp := nil; // use temporary JSON conversion
       SaveJson(Data^, Info, [], RawUtf8(tmp)); // =TJsonWriter.AddTypedJson()
       TRttiVarData(Dest).VType := varEmpty;
       ctx.Json := tmp;
       JsonToAnyVariant(variant(Dest), ctx, Options, true);
       FastAssignNew(tmp);
     end;
  end;
  result := Cache.ItemSize;
end;

procedure TRttiJson.ValueLoadJson(Data: pointer; var Json: PUtf8Char;
  EndOfObject: PUtf8Char; ParserOptions: TJsonParserOptions;
  CustomVariantOptions: PDocVariantOptions; ObjectListItemClass: TClass;
  Interning: TRawUtf8Interning);
var
  ctxt: TJsonParserContext;
begin
  if Assigned(self) then
  begin
    ctxt.InitParser(Json, self, ParserOptions,
      CustomVariantOptions, ObjectListItemClass, Interning);
    if Assigned(fJsonLoad) then
      // efficient direct Json parsing
      TRttiJsonLoad(fJsonLoad)(Data, ctxt)
    else
      // try if binary serialization was used
      ctxt.Valid := ctxt.ParseNext and
            (Ctxt.Value <> nil) and
            (PCardinal(Ctxt.Value)^ and $ffffff = JSON_BASE64_MAGIC_C) and
            BinaryLoadBase64(pointer(Ctxt.Value + 3), Ctxt.ValueLen - 3,
              Data, Ctxt.Info.Info, {uri=}false, rkAllTypes, {withcrc=}false);
    if ctxt.Valid then
      Json := ctxt.Json
    else
      Json := nil;
  end
  else
    Json := nil;
end;

function TRttiJson.ValueIterateCount(Data: pointer): integer;
begin
  result := -1; // unsupported
  if Data <> nil then
    case Kind of
      rkDynArray:
        result := length(PByteDynArray(Data)^); // length() is for all types
      rkClass:
        begin
          Data := PPointer(Data)^; // TObject are stored by reference
          if Data <> nil then
           case ValueRtlClass of
             // vcStrings can't be supported since TStrings.Items[] is a getter
             vcCollection:
               result := TCollection(Data).Count;
             vcObjectList,
             vcList:
               result := TList(Data).Count;
             vcSynList:
               result := TSynList(Data).Count;
             vcRawUtf8List:
               result := TRawUtf8List(Data).Count;
           end;
        end;
    end;
end;

function TRttiJson.ValueIterate(Data: pointer; Index: PtrUInt;
  out ResultRtti: TRttiCustom): pointer;
begin
  result := nil;
  if Data <> nil then
    case Kind of
      rkDynArray:
        if Index < PtrUInt(length(PByteDynArray(Data)^)) then
        begin
          result := PPAnsiChar(Data)^ + (Index * PtrUInt(ArrayRtti.Size));
          ResultRtti := ArrayRtti; // also available for (most) unmanaged types
          if ArrayRtti.Kind in [rkClass, rkLString] then
            result := PPointer(result)^; // resolved as for rkClass below
        end;
      rkClass:
        begin
          Data := PPointer(Data)^; // TObject are stored by reference
          if Data <> nil then
           case ValueRtlClass of
             // getter methods do require resolved results
             vcCollection:
               if Index < PtrUInt(TCollection(Data).Count) then
               begin
                 result := TCollection(Data).Items[Index];
                 ResultRtti := fCollectionItemRtti;
               end;
             vcObjectList,
             vcList:
               if Index < PtrUInt(TList(Data).Count) then
               begin
                 result := TList(Data).List[Index];
                 if result <> nil then
                   ResultRtti := Rtti.RegisterClass(PClass(result)^);
               end;
             vcSynList:
               if Index < PtrUInt(TSynList(Data).Count) then
               begin
                 result := TSynList(Data).List[Index];
                 if result <> nil then
                   ResultRtti := Rtti.RegisterClass(PClass(result)^);
               end;
             vcRawUtf8List:
               if Index < PtrUInt(TRawUtf8List(Data).Count) then
               begin
                 result := TRawUtf8List(Data).TextPtr[Index];
                 ResultRtti := PT_RTTI[ptRawUtf8];
                 exit;
               end;
           end;
        end;
    end;
end;

function StrEquA(n, str: PByte): boolean;
var
  c: byte;
begin
  result := false;
  if str = nil then
    exit;
  repeat
    c := n^;
    if c <> str^ then // UTF-8 case-sensitive search
      exit
    else if c = 0 then
      break; // n = str
    inc(n);
    inc(str);
  until false;
  result := true;
end;

function StrEquAW(n: PByte; str: PWord): boolean;
var
  c: cardinal;
begin
  result := false;
  if str = nil then
    exit;
  repeat
    c := n^;
    if c <> str^ then // 7-bit ASCII case-sensitive search
      exit
    else if c = 0 then
      break; // n = str
    inc(n);
    inc(str);
  until false;
  result := true;
end;

function TRttiJson.ValueByPath(var Data: pointer; Path: PUtf8Char;
  var Temp: TVarData; PathDelim: AnsiChar): TRttiCustom;
var
  vt: TSynInvokeableVariantType;
  p: PRttiCustomProp;
  v: TVarData;
  i: PtrInt;
  n: ShortString;
begin
  result := self;
  if (self <> nil) and
     (Data <> nil) then
  repeat
    GetNextItemShortString(Path, @n, PathDelim);
    if n[0] = #0 then
      break;
    if result.Props.CountNonVoid <> 0 then
    begin
      // search name in rkRecord/rkObject or rkClass properties
      p := FindCustomProp(
        pointer(result.Props.List), @n[1], ord(n[0]), result.Props.Count);
      if (p = nil) or
         (p^.OffsetGet < 0) then // we don't support getters yet
        break;
      result := p^.Value;
      inc(PAnsiChar(Data), p.OffsetGet);
      if Path = nil then
        exit; // reach last path
      if result.Kind = rkClass then // stored by reference
        Data := PPointer(PAnsiChar(Data) + p.OffsetGet)^;
      continue;
    end
    else
    case result.Kind of
      rkVariant:
        // try TDocVariant/TBsonVariant name lookup
        if DocVariantType.FindSynVariantType(PVarData(Data)^.VType, vt) then
        begin
          TRttiVarData(v).VType := varEmpty; // IntGet() would clear it
          vt.IntGet(v, PVarData(Data)^, @n[1], ord(n[0]), {noexc=}true);
          if v.VType = varEmpty then
            break;
          Temp := v;
          Data := @Temp;
          result := PT_RTTI[ptVariant];
          if Path = nil then
            exit;
          continue;
        end;
      rkEnumeration,
      rkSet:
        // check enumeration/set name against the stored value
        if Path = nil then // last path only
        begin
          i := result.Cache.EnumInfo^.GetEnumNameValue(@n[1], ord(n[0]));
          if i < 0 then
            break;
          // enum name match: return a boolean to stop searching
          if result.Kind = rkEnumeration then
          begin
            // true = enum name matches the stored enum value
            result.ValueToVariant(Data, v); // calls RTTI_FROM_ORD[]
            PBoolean(@Temp)^ := v.VInt64 = i;
          end
          else
            // true = enum name is part of the set value
            PBoolean(@Temp)^ := GetBitPtr(Data, i);
          Data := @Temp;
          result := PT_RTTI[ptBoolean]; // true/false if enum name found
          exit;
        end;
      rkLString:
        // case-sensitive comparison of a UTF-8 value with the name
        if Path = nil then // last path only
          if StrEquA(@n[1], PPByte(Data)^) then // n[1] ends with #0
            exit; // return self as non nil value
      {$ifdef HASVARUSTRING}
      rkUstring,
      {$endif HASVARUSTRING}
      rkWString:
        // case-sensitive comparison of a UTF-16 value with the name
        if Path = nil then // last path only
          if StrEquAW(@n[1], PPWord(Data)^) then
            exit;
    end;
    break;
  until false;
  result := nil; // path not found
end;

procedure TRttiJson.RawSaveJson(Data: pointer; const Ctxt: TJsonSaveContext);
begin
  TRttiJsonSave(fJsonSave)(Data, Ctxt);
end;

procedure TRttiJson.RawLoadJson(Data: pointer; var Ctxt: TJsonParserContext);
begin
  TRttiJsonLoad(fJsonLoad)(Data, Ctxt);
end;

class function TRttiJson.Find(Info: PRttiInfo): TRttiJson;
begin
  result := pointer(Rtti.FindType(Info));
end;

class function TRttiJson.RegisterCustomSerializer(Info: PRttiInfo;
  const Reader: TOnRttiJsonRead; const Writer: TOnRttiJsonWrite): TRttiJson;
begin
  result := Rtti.RegisterType(Info) as TRttiJson;
  // (re)set fJsonSave/fJsonLoad
  result.fJsonWriter := TMethod(Writer);
  result.fJsonReader := TMethod(Reader);
  if result.Kind <> rkDynArray then // Reader/Writer are for items, not array
    result.SetParserType(result.Parser, result.ParserComplex);
end;

class function TRttiJson.RegisterCustomSerializerClass(ObjectClass: TClass;
  const Reader: TOnClassJsonRead; const Writer: TOnClassJsonWrite): TRttiJson;
begin
  // without {$M+} ObjectClasss.ClassInfo=nil -> ensure fake RTTI is available
  result := Rtti.RegisterClass(ObjectClass) as TRttiJson;
  result.fJsonWriter := TMethod(Writer);
  result.fJsonReader := TMethod(Reader);
  result.SetParserType(ptClass, pctNone);
end;

class function TRttiJson.UnRegisterCustomSerializer(Info: PRttiInfo): TRttiJson;
begin
  result := Rtti.RegisterType(Info) as TRttiJson;
  result.fJsonWriter.Code := nil; // force reset of the JSON serialization
  result.fJsonReader.Code := nil;
  if result.Kind <> rkDynArray then // Reader/Writer are for items, not array
    result.SetParserType(result.Parser, result.ParserComplex);
end;

class function TRttiJson.UnRegisterCustomSerializerClass(ObjectClass: TClass): TRttiJson;
begin
  // without {$M+} ObjectClasss.ClassInfo=nil -> ensure fake RTTI is available
  result := Rtti.RegisterClass(ObjectClass) as TRttiJson;
  result.fJsonWriter.Code := nil; // force reset of the JSON serialization
  result.fJsonReader.Code := nil;
  result.SetParserType(result.Parser, result.ParserComplex);
end;

class function TRttiJson.RegisterFromText(DynArrayOrRecord: PRttiInfo;
  const RttiDefinition: RawUtf8;
  IncludeReadOptions: TJsonParserOptions;
  IncludeWriteOptions: TTextWriterWriteObjectOptions): TRttiJson;
begin
  result := Rtti.RegisterFromText(DynArrayOrRecord, RttiDefinition) as TRttiJson;
  result.fIncludeReadOptions := IncludeReadOptions;
  result.fIncludeWriteOptions := IncludeWriteOptions;
end;


procedure _GetDataFromJson(Data: pointer; var Json: PUtf8Char;
  EndOfObject: PUtf8Char; Rtti: TRttiCustom;
  CustomVariantOptions: PDocVariantOptions; Tolerant: boolean;
  Interning: TRawUtf8InterningAbstract);
begin
  (Rtti as TRttiJson).ValueLoadJson(Data, Json, EndOfObject,
    JSONPARSER_DEFAULTORTOLERANTOPTIONS[Tolerant],
    CustomVariantOptions, nil, TRawUtf8Interning(Interning));
end;


{ ********** JSON Serialization Wrapper Functions }

function JsonEncode(const NameValuePairs: array of const): RawUtf8;
var
  temp: TTextWriterStackBuffer;
begin
  if high(NameValuePairs) < 1 then
    // return void JSON object on error
    result := '{}'
  else
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      AddJsonEscape(NameValuePairs);
      SetText(result);
    finally
      Free
    end;
end;

function JsonEncode(const Format: RawUtf8;
  const Args, Params: array of const): RawUtf8;
var
  temp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(temp) do
  try
    AddJson(Format, Args, Params);
    SetText(result);
  finally
    Free
  end;
end;

function JsonEncodeArrayDouble(const Values: array of double): RawUtf8;
var
  W: TJsonWriter;
  temp: TTextWriterStackBuffer;
begin
  W := TJsonWriter.CreateOwnedStream(temp);
  try
    W.Add('[');
    W.AddCsvDouble(Values);
    W.Add(']');
    W.SetText(result);
  finally
    W.Free
  end;
end;

function JsonEncodeArrayUtf8(const Values: array of RawUtf8): RawUtf8;
var
  W: TJsonWriter;
  temp: TTextWriterStackBuffer;
begin
  W := TJsonWriter.CreateOwnedStream(temp);
  try
    W.Add('[');
    W.AddCsvUtf8(Values);
    W.Add(']');
    W.SetText(result);
  finally
    W.Free
  end;
end;

function JsonEncodeArrayInteger(const Values: array of integer): RawUtf8;
var
  W: TJsonWriter;
  temp: TTextWriterStackBuffer;
begin
  W := TJsonWriter.CreateOwnedStream(temp);
  try
    W.Add('[');
    W.AddCsvInteger(Values);
    W.Add(']');
    W.SetText(result);
  finally
    W.Free
  end;
end;

function JsonEncodeArrayOfConst(const Values: array of const;
  WithoutBraces: boolean): RawUtf8;
begin
  JsonEncodeArrayOfConst(Values, WithoutBraces, result);
end;

procedure JsonEncodeArrayOfConst(const Values: array of const;
  WithoutBraces: boolean; var result: RawUtf8);
var
  temp: TTextWriterStackBuffer;
begin
  if length(Values) = 0 then
    if WithoutBraces then
      result := ''
    else
      result := '[]'
  else
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      if not WithoutBraces then
        Add('[');
      AddCsvConst(Values);
      if not WithoutBraces then
        Add(']');
      SetText(result);
    finally
      Free
    end;
end;

procedure JsonEncodeNameSQLValue(const Name, SQLValue: RawUtf8;
  var result: RawUtf8);
var
  temp: TTextWriterStackBuffer;
begin
  if (SQLValue <> '') and
     (SQLValue[1] in ['''', '"']) then
    // unescape SQL quoted string value into a valid JSON string
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      Add('{', '"');
      AddNoJsonEscapeUtf8(Name);
      Add('"', ':');
      AddQuotedStringAsJson(SQLValue);
      Add('}');
      SetText(result);
    finally
      Free;
    end
  else
    // Value is a number or null/true/false
    result := '{"' + Name + '":' + SQLValue + '}';
end;

procedure SaveJson(const Value; TypeInfo: PRttiInfo; Options: TTextWriterOptions;
  var result: RawUtf8; ObjectOptions: TTextWriterWriteObjectOptions);
var
  temp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(temp, twoNoSharedStream in Options) do
  try
    CustomOptions := CustomOptions + Options;
    AddTypedJson(@Value, TypeInfo, ObjectOptions);
    SetText(result);
  finally
    Free;
  end;
end;

function SaveJson(const Value; TypeInfo: PRttiInfo; EnumSetsAsText: boolean): RawUtf8;
begin
  SaveJson(Value, TypeInfo, TEXTWRITEROPTIONS_SETASTEXT[EnumSetsAsText], result);
end;

function SaveJson(const Value; TypeInfo: PRttiInfo): RawUtf8;
begin
  SaveJson(Value, TypeInfo, [], Result, []);
end;

function SaveJson(const Value; const TypeName: RawUtf8;
  Options: TTextWriterOptions): RawUtf8;
var
  nfo: TRttiCustom;
begin
  nfo := Rtti.RegisterTypeFromName(TypeName);
  if nfo = nil then
    result := ''
  else
    SaveJson(Value, nfo.Cache.Info, Options, result);
end;

{$ifdef FPC}
procedure JsonForDebug(Value: pointer; var TypeName: RawUtf8;
  out JsonResultText: RawUtf8);
var
  nfo: TRttiCustom;
  vmt: PAnsiChar;
begin
  if (TypeName <> '') and
     (Value <> nil) then
  try
    nfo := Rtti.RegisterTypeFromName(TypeName); // from Rtti.Register*() functions
    {$ifdef HASINTERFACEASTOBJECT} // we target FPC/Lazarus anyway
    if (nfo = nil) and
       (TypeName[1] = 'I') then // guess class instance from interface variable
      nfo := Rtti.RegisterClass(PInterface(Value)^ as TObject);
    {$endif HASINTERFACEASTOBJECT}
    if (nfo = nil) and
       (TypeName[1] = 'T') then
    begin
      vmt := PPointer(Value)^; // guess if seems to be a real TObject instance
      if (vmt <> nil) and
         SeemsRealPointer(vmt) and
         (PPtrInt(vmt + vmtInstanceSize)^ >= sizeof(vmt)) and
         SeemsRealPointer(PPointer(vmt + vmtClassName)^) and
         IdemPropName(PShortString(vmt + vmtClassName)^,
           pointer(TypeName), length(TypeName)) then
        nfo := Rtti.RegisterClass(TClass(pointer(vmt)));
    end;
    if nfo <> nil then
    begin
      SaveJson(Value^, nfo.Cache.Info, [twoEnumSetsAsBooleanInRecord],
        JsonResultText, [woEnumSetsAsText]);
      exit;
    end;
  except // especially if Value is no class
    JsonResultText := ''; // impossible to serialization this value
  end;
end;
{$endif FPC}

function RecordSaveJson(const Rec; TypeInfo: PRttiInfo;
  EnumSetsAsText: boolean): RawUtf8;
begin
  if (TypeInfo <> nil) and
     (TypeInfo^.Kind in rkRecordTypes) then
    SaveJson(Rec, TypeInfo, TEXTWRITEROPTIONS_SETASTEXT[EnumSetsAsText], result)
  else
    result := NULL_STR_VAR;
end;

function DynArraySaveJson(const Value; TypeInfo: PRttiInfo;
  EnumSetsAsText: boolean): RawUtf8;
begin
  if (TypeInfo = nil) or
     (TypeInfo^.Kind <> rkDynArray) then
    result := NULL_STR_VAR
  else if pointer(Value) = nil then
    result := '[]'
  else
    SaveJson(Value, TypeInfo, TEXTWRITEROPTIONS_SETASTEXT[EnumSetsAsText], result);
end;

function DynArrayBlobSaveJson(TypeInfo: PRttiInfo;
  BlobValue: pointer; BlobLen: PtrInt): RawUtf8;
var
  DynArray: TDynArray;
  Value: pointer; // decode BlobValue into a temporary dynamic array
  temp: TTextWriterStackBuffer;
begin
  Value := nil;
  DynArray.Init(TypeInfo, Value);
  try
    if DynArray.LoadFrom(BlobValue, PAnsiChar(BlobValue) + BlobLen) = nil then
      result := ''
    else
      with TJsonWriter.CreateOwnedStream(temp) do
      try
        AddDynArrayJson(DynArray);
        SetText(result);
      finally
        Free;
      end;
  finally
    DynArray.Clear; // release temporary memory
  end;
end;

function ObjArrayToJson(const aObjArray;
  aOptions: TTextWriterWriteObjectOptions): RawUtf8;
var
  temp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(temp) do
  try
    if woEnumSetsAsText in aOptions then
      CustomOptions := CustomOptions + [twoEnumSetsAsTextInRecord];
    AddObjArrayJson(aObjArray, aOptions);
    SetText(result);
  finally
    Free;
  end;
end;

function ObjectsToJson(const Names: array of RawUtf8;
  const Values: array of TObject;
  Options: TTextWriterWriteObjectOptions): RawUtf8;
var
  i, n: PtrInt;
  temp: TTextWriterStackBuffer;
begin
  with TJsonWriter.CreateOwnedStream(temp) do
  try
    n := high(Names);
    BlockBegin('{', Options);
    i := 0;
    if i <= high(Values) then
      repeat
        if i <= n then
          AddFieldName(Names[i])
        else if Values[i] = nil then
          AddFieldName(SmallUInt32Utf8[i])
        else
          AddPropName(ClassNameShort(Values[i])^);
        WriteObject(Values[i], Options);
        if i = high(Values) then
          break;
        BlockAfterItem(Options);
        inc(i);
      until false;
    CancelLastComma;
    BlockEnd('}', Options);
    SetText(result);
  finally
    Free;
  end;
end;

function ObjectToJsonFile(Value: TObject; const JsonFile: TFileName;
  Options: TTextWriterWriteObjectOptions): boolean;
var
  humanread: boolean;
  json: RawUtf8;
begin
  humanread := woHumanReadable in Options;
  if humanread and
     (woHumanReadableEnumSetAsComment in Options) then
    humanread := false
  else
    // JsonReformat() erases comments
    exclude(Options, woHumanReadable);
  json := ObjectToJson(Value, Options);
  if humanread then
    // woHumanReadable not working with custom JSON serializers, e.g. T*ObjArray
    // TODO: check if this is always the case with our mORMot2 new serialization
    result := JsonBufferReformatToFile(pointer(json), JsonFile)
  else
    result := FileFromString(json, JsonFile);
end;

function GetValueObject(Instance: TObject; const Path: RawUtf8;
  out Value: variant): boolean;
var
  p: PRttiCustomProp;
begin
  result := GetInstanceByPath(Instance, Path, p);
  if result then
    p^.GetValueVariant(Instance, TVarData(Value), @JSON_[mFastFloat]);
end;

function LoadJsonInPlace(var Value; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char; CustomVariantOptions: PDocVariantOptions;
  Tolerant: boolean; Interning: TRawUtf8Interning): PUtf8Char;
begin
  TRttiJson(Rtti.RegisterType(TypeInfo)).ValueLoadJson(
    @Value, Json, EndOfObject, JSONPARSER_DEFAULTORTOLERANTOPTIONS[Tolerant],
    CustomVariantOptions, nil, Interning);
  result := Json;
end;

function LoadJson(var Value; const Json: RawUtf8; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char; CustomVariantOptions: PDocVariantOptions;
  Tolerant: boolean; Interning: TRawUtf8Interning): boolean;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json); // make private copy before in-place decoding
  try
    result := LoadJsonInPlace(Value, tmp.buf, TypeInfo, EndOfObject,
      CustomVariantOptions, Tolerant, Interning) <> nil;
  finally
    tmp.Done;
  end;
end;

function RecordLoadJson(var Rec; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char; CustomVariantOptions: PDocVariantOptions;
  Tolerant: boolean; Interning: TRawUtf8Interning): PUtf8Char;
begin
  if (TypeInfo = nil) or
     not (TypeInfo.Kind in rkRecordTypes) then
    raise EJsonException.CreateUtf8('RecordLoadJson: % is not a record',
      [TypeInfo.Name]);
  TRttiJson(Rtti.RegisterType(TypeInfo)).ValueLoadJson(
    @Rec, Json, EndOfObject, JSONPARSER_DEFAULTORTOLERANTOPTIONS[Tolerant],
    CustomVariantOptions, nil, Interning);
  result := Json;
end;

function RecordLoadJson(var Rec; const Json: RawUtf8; TypeInfo: PRttiInfo;
  CustomVariantOptions: PDocVariantOptions; Tolerant: boolean;
  Interning: TRawUtf8Interning): boolean;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json); // make private copy before in-place decoding
  try
    result := RecordLoadJson(Rec, tmp.buf, TypeInfo, nil,
      CustomVariantOptions, Tolerant, Interning) <> nil;
  finally
    tmp.Done;
  end;
end;

function DynArrayLoadJson(var Value; Json: PUtf8Char; TypeInfo: PRttiInfo;
  EndOfObject: PUtf8Char; CustomVariantOptions: PDocVariantOptions;
  Tolerant: boolean; Interning: TRawUtf8Interning): PUtf8Char;
begin
  if (TypeInfo = nil) or
     (TypeInfo.Kind <> rkDynArray) then
    raise EJsonException.CreateUtf8('DynArrayLoadJson: % is not a dynamic array',
      [TypeInfo.Name]);
  TRttiJson(Rtti.RegisterType(TypeInfo)).ValueLoadJson(
    @Value, Json, EndOfObject, JSONPARSER_DEFAULTORTOLERANTOPTIONS[Tolerant],
    CustomVariantOptions, nil, Interning);
  result := Json;
end;

function DynArrayLoadJson(var Value; const Json: RawUtf8; TypeInfo: PRttiInfo;
  CustomVariantOptions: PDocVariantOptions; Tolerant: boolean;
  Interning: TRawUtf8Interning): boolean;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json); // make private copy before in-place decoding
  try
    result := DynArrayLoadJson(Value, tmp.buf, TypeInfo, nil,
      CustomVariantOptions, Tolerant, Interning) <> nil;
  finally
    tmp.Done;
  end;
end;

function JsonToObject(var ObjectInstance; From: PUtf8Char; out Valid: boolean;
  TObjectListItemClass: TClass; Options: TJsonParserOptions;
  Interning: TRawUtf8Interning): PUtf8Char;
var
  ctxt: TJsonParserContext;
begin
  if pointer(ObjectInstance) = nil then
    raise ERttiException.Create('JsonToObject(nil)');
  ctxt.InitParser(From, Rtti.RegisterClass(TObject(ObjectInstance)), Options,
    nil, TObjectListItemClass, Interning);
  TRttiJsonLoad(Ctxt.Info.JsonLoad)(@ObjectInstance, ctxt);
  Valid := ctxt.Valid;
  result := ctxt.Json;
end;

function JsonSettingsToObject(const JsonContent: RawUtf8;
  Instance: TObject): boolean;
var
  tmp: TSynTempBuffer;
begin
  result := false;
  if JsonContent = '' then
    exit;
  tmp.Init(JsonContent); // copy for in-place comment removal and JSON parsing
  try
    RemoveCommentsFromJson(tmp.buf);
    JsonToObject(Instance, tmp.buf, result, nil, JSONPARSER_TOLERANTOPTIONS);
  finally
    tmp.Done;
  end;
end;

function ObjectLoadJson(var ObjectInstance; const Json: RawUtf8;
  TObjectListItemClass: TClass; Options: TJsonParserOptions;
  Interning: TRawUtf8Interning): boolean;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json);
  if tmp.len <> 0 then
    try
      JsonToObject(ObjectInstance,
        tmp.buf, result, TObjectListItemClass, Options, Interning);
    finally
      tmp.Done;
    end
  else
    result := false;
end;

function JsonToNewObject(var From: PUtf8Char; var Valid: boolean;
  Options: TJsonParserOptions; Interning: TRawUtf8Interning): TObject;
var
  ctxt: TJsonParserContext;
begin
  ctxt.InitParser(From, nil, Options, nil, nil, Interning);
  result := ctxt.ParseNewObject;
  Valid := ctxt.Valid;
end;

function PropertyFromJson(Prop: PRttiCustomProp; Instance: TObject;
  From: PUtf8Char; var Valid: boolean; Options: TJsonParserOptions;
  Interning: TRawUtf8Interning): PUtf8Char;
var
  ctxt: TJsonParserContext;
begin
  Valid := false;
  result := nil;
  if (Prop = nil) or
     (Prop^.Value.Kind <> rkClass) or
     (Instance = nil) then
    exit;
  ctxt.InitParser(From, Prop^.Value, Options, nil, nil, Interning);
  if not JsonLoadProp(pointer(Instance), Prop, ctxt) then
    exit;
  Valid := true;
  result := ctxt.Json;
end;

function UrlDecodeObject(U: PUtf8Char; Upper: PAnsiChar;
  var ObjectInstance; Next: PPUtf8Char; Options: TJsonParserOptions): boolean;
var
  tmp: RawUtf8;
begin
  result := UrlDecodeValue(U, Upper, tmp, Next);
  if result then
    JsonToObject(ObjectInstance, Pointer(tmp), result, nil, Options);
end;

function JsonFileToObject(const JsonFile: TFileName; var ObjectInstance;
  TObjectListItemClass: TClass; Options: TJsonParserOptions;
  Interning: TRawUtf8Interning): boolean;
var
  tmp: RawUtf8;
begin
  tmp := RawUtf8FromFile(JsonFile);
  if tmp = '' then
    result := false
  else
  begin
    RemoveCommentsFromJson(pointer(tmp));
    JsonToObject(ObjectInstance,
      pointer(tmp), result, TObjectListItemClass, Options, Interning);
  end;
end;

procedure JsonBufferToXML(P: PUtf8Char; const Header, NameSpace: RawUtf8;
  out result: RawUtf8);
var
  i, j, L: PtrInt;
  temp: TTextWriterStackBuffer;
begin
  if P = nil then
    result := Header
  else
    with TJsonWriter.CreateOwnedStream(temp) do
    try
      AddNoJsonEscape(pointer(Header), length(Header));
      L := length(NameSpace);
      if L <> 0 then
        AddNoJsonEscape(pointer(NameSpace), L);
      AddJsonToXML(P);
      if L <> 0 then
        for i := 1 to L do
          if NameSpace[i] = '<' then
          begin
            for j := i + 1 to L do
              if NameSpace[j] in [' ', '>'] then
              begin
                Add('<', '/');
                AddStringCopy(NameSpace, i + 1, j - i - 1);
                Add('>');
                break;
              end;
            break;
          end;
      SetText(result);
    finally
      Free;
    end;
end;

function JsonToXML(const Json, Header, NameSpace: RawUtf8): RawUtf8;
var
  tmp: TSynTempBuffer;
begin
  tmp.Init(Json);
  try
    JsonBufferToXML(tmp.buf, Header, NameSpace, result);
  finally
    tmp.Done;
  end;
end;


{ ********************* Abstract Classes with Auto-Create-Fields }

function DoRegisterAutoCreateFields(ObjectInstance: TObject): TRttiJson;
begin // sub procedure for smaller code generation in AutoCreateFields/Create
  result := Rtti.RegisterAutoCreateFieldsClass(PClass(ObjectInstance)^) as TRttiJson;
end;

function AutoCreateFields(ObjectInstance: TObject): TRttiJson;
var
  n: integer;
  p: PPRttiCustomProp;
begin
  // inlined Rtti.RegisterClass()
  {$ifdef NOPATCHVMT}
  result := pointer(Rtti.FindType(PPointer(PPAnsiChar(ObjectInstance)^ + vmtTypeInfo)^));
  {$else}
  result := PPointer(PPAnsiChar(ObjectInstance)^ + vmtAutoTable)^;
  {$endif NOPATCHVMT}
  if (result = nil) or
     not (rcfAutoCreateFields in result.Flags) then
    result := DoRegisterAutoCreateFields(ObjectInstance);
  p := pointer(result.fAutoCreateInstances);
  if p = nil then
    exit;
  // create all published class (or IDocList/IDocDict) fields
  n := PDALen(PAnsiChar(p) - _DALEN)^ + _DAOFF; // length(AutoCreateClasses)
  repeat
    with p^^ do
      PPointer(PAnsiChar(ObjectInstance) + OffsetGet)^ :=
        TRttiJson(Value).fNewInstance(Value); // class or interface
    inc(p);
    dec(n);
  until n = 0;
end;

procedure AutoDestroyFields(ObjectInstance: TObject; Info: TRttiJson);
var
  n: integer;
  p: PPRttiCustomProp;
  arr: pointer;
  o: TObject;
begin
  if Info = nil then
    {$ifdef NOPATCHVMT}
    Info := pointer(Rtti.FindType(PPointer(PPAnsiChar(ObjectInstance)^ + vmtTypeInfo)^));
    {$else}
    Info := PPointer(PPAnsiChar(ObjectInstance)^ + vmtAutoTable)^;
    {$endif NOPATCHVMT}
  // free all published class fields
  p := pointer(Info.fAutoDestroyClasses);
  if p <> nil then
  begin
    n := PDALen(PAnsiChar(p) - _DALEN)^ + _DAOFF;
    repeat
      o := PObject(PAnsiChar(ObjectInstance) + p^^.OffsetGet)^;
      if o <> nil then
        // inlined o.Free
        o.Destroy;
      inc(p);
      dec(n);
    until n = 0;
  end;
  // release all published T*ObjArray fields
  p := pointer(Info.fAutoCreateObjArrays);
  if p = nil then
    exit;
  n := PDALen(PAnsiChar(p) - _DALEN)^ + _DAOFF;
  repeat
    arr := PPointer(PAnsiChar(ObjectInstance) + p^^.OffsetGet)^;
    if arr <> nil then
      // inlined ObjArrayClear()
      RawObjectsClear(arr, PDALen(PAnsiChar(arr) - _DALEN)^ + _DAOFF);
    inc(p);
    dec(n);
  until n = 0;
end;


{ TPersistentAutoCreateFields }

constructor TPersistentAutoCreateFields.Create;
begin
  AutoCreateFields(self);
end; // no need to call the void inherited TPersistentWithCustomCreate

destructor TPersistentAutoCreateFields.Destroy;
begin
  AutoDestroyFields(self);
  inherited Destroy;
end;


{ TSynAutoCreateFields }

constructor TSynAutoCreateFields.Create;
begin
  AutoCreateFields(self);
end; // no need to call the void inherited TSynPersistent

destructor TSynAutoCreateFields.Destroy;
begin
  AutoDestroyFields(self);
  inherited Destroy;
end;


{ TSynAutoCreateFieldsLocked }

constructor TSynAutoCreateFieldsLocked.Create;
begin
  AutoCreateFields(self);
  inherited Create; // initialize fSafe := NewSynLocker
end;

destructor TSynAutoCreateFieldsLocked.Destroy;
begin
  AutoDestroyFields(self);
  inherited Destroy;
end;


{ TInterfacedObjectAutoCreateFields }

constructor TInterfacedObjectAutoCreateFields.Create;
begin
  AutoCreateFields(self);
end; // no need to call TInterfacedObjectWithCustomCreate.Create

destructor TInterfacedObjectAutoCreateFields.Destroy;
begin
  AutoDestroyFields(self);
  inherited Destroy;
end;


{ TInterfacedSerializable }

class function TInterfacedSerializable.SerializableInterface: TRttiCustom;
begin
  result := Rtti.FindClass(self).Cache.SerializableInterface;
end;

class function TInterfacedSerializable.Guid: PGuid;
begin
  result := SerializableInterface.Cache.InterfaceGuid;
end;

function _New_ISerializable(Rtti: TRttiCustom): pointer;
begin
  result := TInterfacedSerializableClass(Rtti.Cache.SerializableClass).Create(nil);
  TInterfacedSerializable(result).fRefCount := 1; // inlined GetInterface()
  inc(PByte(result), Rtti.Cache.SerializableInterfaceEntryOffset);
end;

class procedure TInterfacedSerializable.NewInterface(out Obj);
begin
  pointer(Obj) := _New_ISerializable(SerializableInterface);
end;

class function TInterfacedSerializable.RegisterToRtti(
  InterfaceInfo: PRttiInfo): TRttiJson;
var
  ent: PInterfaceEntry;
begin
  ent := nil;
  if (self <> nil) and
     InterfaceInfo^.InterfaceImplements(ISerializable) then
    ent := GetInterfaceEntry(InterfaceInfo^.InterfaceGuid^); // resolve TGuid
  if (ent = nil) or
     not InterfaceEntryIsStandard(ent) then
    raise ERttiException.CreateUtf8('Unexpected %.RegisterToRtti(%)',
      [self, InterfaceInfo^.Name^]);
  result := Rtti.RegisterType(InterfaceInfo) as TRttiJson;
  result.fCache.SerializableClass := self;
  result.fCache.SerializableInterfaceEntryOffset := ent^.IOffset; // get once
  TOnRttiJsonRead(result.fJsonReader) := JL;
  TOnRttiJsonWrite(result.fJsonWriter) := JS;
  result.SetParserType(result.Parser, result.ParserComplex); // needed
  result.fNewInstance := @_New_ISerializable;
  TRttiJson(Rtti.RegisterClass(self)).fCache.SerializableInterface := result;
end;

procedure TInterfacedSerializable.SetJson(const value: RawUtf8);
var
  tmp: TSynTempBuffer;
  ctx: TJsonParserContext;
begin
  tmp.Init(value);
  try
    ctx.InitParser(tmp.buf, SerializableInterface, [], nil, nil, nil);
    FromJson(ctx);
  finally
    tmp.Done;
  end;
end;

class procedure TInterfacedSerializable.JS(W: TJsonWriter; data: pointer;
  options: TTextWriterWriteObjectOptions);
begin
  data := PPointer(data)^;
  if data = nil then
    W.AddNull // avoid GPF if ISerializable = nil
  else
    ISerializable(data).ToJson(W, options);
end;

class procedure TInterfacedSerializable.JL(var context: TJsonParserContext;
  data: pointer);
var
  o: TInterfacedSerializable;
  i: ^ISerializable absolute data;
begin
  if not Assigned(i^) then
  begin // inlined Create + GetInterface()
    o := Create(context.CustomVariant);
    o.fRefCount := 1;
    inc(PByte(o), context.Info.Cache.SerializableInterfaceEntryOffset);
    PPointer(data)^ := o;
  end;
  i^.FromJson(context)
end;

function TInterfacedSerializable.GetJson: RawUtf8;
begin
  result := ToJson(jsonCompact, []);
end;

function TInterfacedSerializable.ToJson(format: TTextWriterJsonFormat;
  options: TTextWriterWriteObjectOptions): RawUtf8;
var
  W: TJsonWriter;
  temp: TTextWriterStackBuffer;
begin
  W := TJsonWriter.CreateOwnedStream(temp);
  try
    ToJson(W, options);
    W.SetText(result, Format);
  finally
    W.Free;
  end;
end;

function TInterfacedSerializable.ToString(format: TTextWriterJsonFormat;
  options: TTextWriterWriteObjectOptions): string;
begin
  Utf8ToStringVar(ToJson(format, options), result);
end;


{ TInterfacedSerializableAutoCreateFields }

constructor TInterfacedSerializableAutoCreateFields.Create(
  options: PDocVariantOptions);
begin
  fRttiJson := AutoCreateFields(self);
end;

destructor TInterfacedSerializableAutoCreateFields.Destroy;
begin
  AutoDestroyFields(self, fRttiJson);
  inherited Destroy;
end;

procedure TInterfacedSerializableAutoCreateFields.ToJson(W: TJsonWriter;
  options: TTextWriterWriteObjectOptions);
var
  ctx: TJsonSaveContext;
begin
  ctx.W := W;
  ctx.Info := fRttiJson;
  ctx.Options := options + fRttiJson.IncludeWriteOptions;
  _JS_RttiCustom(@self, ctx); // all done via known RTTI
end;

procedure TInterfacedSerializableAutoCreateFields.FromJson(
  var context: TJsonParserContext);
begin
  context.Info := fRttiJson; // from interface RTTI to class RTTI
  _JL_RttiCustom(@self, context);
end;


{ TCollectionItemAutoCreateFields }

constructor TCollectionItemAutoCreateFields.Create(Collection: TCollection);
begin
  AutoCreateFields(self);
  inherited Create(Collection);
end;

destructor TCollectionItemAutoCreateFields.Destroy;
begin
  AutoDestroyFields(self);
  inherited Destroy;
end;


{ TSynJsonFileSettings }

function TSynJsonFileSettings.AfterLoad: boolean;
begin
  result := true; // success
end;

function TSynJsonFileSettings.LoadFromJson(const aJson: RawUtf8;
  const aSectionName: RawUtf8): boolean;
begin
  if fsoReadIni in fSettingsOptions then
  begin
    fSectionName := aSectionName;
    result := false;
  end
  else
    result := JsonSettingsToObject(aJson, self);
  if not result then
  begin
    result := IniToObject(aJson, self, aSectionName, @JSON_[mFastFloat]);
    if result then
    begin
      fSectionName := aSectionName;
      include(fSettingsOptions, fsoWriteIni); // save back as INI
    end;
  end;
  if result then
    result := AfterLoad;
end;

function TSynJsonFileSettings.LoadFromFile(const aFileName: TFileName;
  const aSectionName: RawUtf8): boolean;
begin
  fFileName := aFileName;
  fInitialJsonContent := RawUtf8FromFile(aFileName); // may detect BOM
  result := LoadFromJson(fInitialJsonContent, aSectionName);
  if not result then
    fInitialJsonContent := ''; // file was neither valid JSON nor INI: ignore
end;

function TSynJsonFileSettings.FolderName: TFileName;
begin
  if self = nil then
    result := ''
  else
    result := ExtractFilePath(fFileName);
end;

procedure TSynJsonFileSettings.SaveIfNeeded;
var
  saved: RawUtf8;
begin
  if (self = nil) or
     (fFileName = '') or
     (fsoDisableSaveIfNeeded in fSettingsOptions) then
    exit;
  if fsoWriteIni in fSettingsOptions then
    saved := ObjectToIni(self, fSectionName)
  else
    saved := ObjectToJson(self, SETTINGS_WRITEOPTIONS);
  if saved = fInitialJsonContent then
    exit;
  FileFromString(saved, fFileName);
  fInitialJsonContent := saved;
end;


type // local type definitions for their own RTTI to be found by name
  RawUtf8 = type Utf8String;
  {$ifdef CPU64}
  PtrInt  = type Int64;
  PtrUInt = type QWord;
  {$else}
  PtrInt  = type integer;
  PtrUInt = type cardinal;
  {$endif CPU64}

procedure InitializeUnit;
var
  i: integer; // not PtrInt since has just been overriden
  c: AnsiChar;
  {$ifdef FPC} dummy: RawUtf8; {$endif}
begin
  // branchless JSON escaping - JSON_ESCAPE_NONE=0 if no JSON escape needed
  JSON_ESCAPE[0]   := JSON_ESCAPE_ENDINGZERO; // 1 for #0 end of input
  for i := 1 to 31 do
    JSON_ESCAPE[i] := JSON_ESCAPE_UNICODEHEX; // 2 to escape #1..#31 as \u00xx
  JSON_ESCAPE[8]   := ord('b');  // others contain the escaped character
  JSON_ESCAPE[9]   := ord('t');
  JSON_ESCAPE[10]  := ord('n');
  JSON_ESCAPE[12]  := ord('f');
  JSON_ESCAPE[13]  := ord('r');
  JSON_ESCAPE[ord('\')] := ord('\');
  JSON_ESCAPE[ord('"')] := ord('"');
  for c := #32 to #127 do
    JSON_UNESCAPE[c] := c;
  JSON_UNESCAPE['b'] := #8;
  JSON_UNESCAPE['t'] := #9;
  JSON_UNESCAPE['n'] := #10;
  JSON_UNESCAPE['f'] := #12;
  JSON_UNESCAPE['r'] := #13;
  JSON_UNESCAPE['u'] := JSON_UNESCAPE_UTF16;
  for c := low(c) to high(c) do
  begin
    if c in [#0, ',', ']', '}', ':'] then
      include(JSON_CHARS[c], jcEndOfJsonFieldOr0);
    if c in [#0, ',', ']', '}'] then
      include(JSON_CHARS[c], jcEndOfJsonFieldNotName);
    if c in [#0, #9, #10, #13, ' ',  ',', '}', ']'] then
      include(JSON_CHARS[c], jcEndOfJsonValueField);
    if c in [#0, '"', '\'] then
      include(JSON_CHARS[c], jcJsonStringMarker);
    if c in ['-', '0'..'9'] then
    begin
      include(JSON_CHARS[c], jcDigitFirstChar);
      JSON_TOKENS[c] := jtFirstDigit;
    end;
    if c in ['-', '+', '0'..'9', '.', 'E', 'e'] then
      include(JSON_CHARS[c], jcDigitFloatChar);
    if c in ['_', '0'..'9', 'a'..'z', 'A'..'Z', '$'] then
      include(JSON_CHARS[c], jcJsonIdentifierFirstChar);
    if c in ['_', '0'..'9', 'a'..'z', 'A'..'Z', '.', '[', ']'] then
      include(JSON_CHARS[c], jcJsonIdentifier);
    if c in ['_', 'a'..'z', 'A'..'Z', '$'] then
      // exclude '0'..'9' as already in jcDigitFirstChar
      JSON_TOKENS[c] := jtIdentifierFirstChar;
  end;
  JSON_TOKENS[#0 ]  := jtEndOfBuffer;
  JSON_TOKENS['{']  := jtObjectStart;
  JSON_TOKENS['}']  := jtObjectStop;
  JSON_TOKENS['[']  := jtArrayStart;
  JSON_TOKENS[']']  := jtArrayStop;
  JSON_TOKENS[':']  := jtAssign;
  JSON_TOKENS['=']  := jtEqual;
  JSON_TOKENS[',']  := jtComma;
  JSON_TOKENS[''''] := jtSingleQuote;
  JSON_TOKENS['"']  := jtDoubleQuote;
  JSON_TOKENS['t']  := jtTrueFirstChar;
  JSON_TOKENS['f']  := jtFalseFirstChar;
  JSON_TOKENS['n']  := jtNullFirstChar;
  JSON_TOKENS['/']  := jtSlash;
  // initialize JSON serialization
  Rtti.GlobalClass := TRttiJson; // will ensure Rtti.Count = 0
  // now we can register some local type alias to be found by name or ASAP
  Rtti.RegisterTypes([TypeInfo(RawUtf8), TypeInfo(PtrInt), TypeInfo(PtrUInt),
    TypeInfo(TRawUtf8DynArray), TypeInfo(TIntegerDynArray)]);
  // prepare some JSON wrappers
  GetDataFromJson := _GetDataFromJson;
  InitializeVariantsJson; // from mormot.core.variants
  {$ifdef FPC} // we need to call it once so that it is linked to the executable
  JsonForDebug(nil, dummy, dummy);
  {$endif FPC}
end;


initialization
  InitializeUnit;
  DefaultJsonWriter := TJsonWriter;

end.