mirror of
https://github.com/salvadordf/CEF4Delphi.git
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413 lines
13 KiB
ObjectPascal
413 lines
13 KiB
ObjectPascal
unit uCEFJson;
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{$IFDEF FPC}
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{$MODE OBJFPC}{$H+}
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{$ENDIF}
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{$I cef.inc}
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{$IFNDEF TARGET_64BITS}{$ALIGN ON}{$ENDIF}
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{$MINENUMSIZE 4}
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interface
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uses
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{$IFDEF DELPHI16_UP}
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System.Classes, System.SysUtils,
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{$ELSE}
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Classes, SysUtils,
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{$ENDIF}
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uCEFInterfaces, uCEFTypes, uCEFConstants;
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type
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TCEFJson = class
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public
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/// <summary>
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/// Returns the ICefValue value at the specified key.
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/// </summary>
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class function ReadValue(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefValue) : boolean;
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/// <summary>
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/// Returns the boolean value at the specified key.
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/// </summary>
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class function ReadBoolean(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : boolean) : boolean;
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/// <summary>
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/// Returns the integer value at the specified key.
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/// </summary>
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class function ReadInteger(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : integer) : boolean;
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/// <summary>
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/// Returns the double value at the specified key.
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/// </summary>
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class function ReadDouble(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : double) : boolean;
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/// <summary>
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/// Returns the ustring value at the specified key.
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/// </summary>
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class function ReadString(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ustring) : boolean;
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/// <summary>
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/// Returns the ICefBinaryValue value at the specified key.
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/// </summary>
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class function ReadBinary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefBinaryValue) : boolean;
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/// <summary>
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/// Returns the ICefDictionaryValue value at the specified key.
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/// </summary>
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class function ReadDictionary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefDictionaryValue) : boolean;
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/// <summary>
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/// Returns the ICefListValue value at the specified key.
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/// </summary>
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class function ReadList(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefListValue) : boolean;
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/// <summary>
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/// Parses the specified |json_string| and returns a dictionary or list
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/// representation. If JSON parsing fails this function returns NULL.
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/// </summary>
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class function Parse(const jsonString: ustring; options: TCefJsonParserOptions = JSON_PARSER_RFC): ICefValue; overload;
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/// <summary>
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/// Parses the specified UTF8-encoded |json| buffer of size |json_size| and
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/// returns a dictionary or list representation. If JSON parsing fails this
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/// function returns NULL.
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/// </summary>
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class function Parse(const json: Pointer; json_size: NativeUInt; options: TCefJsonParserOptions = JSON_PARSER_RFC): ICefValue; overload;
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/// <summary>
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/// Parses the specified |json_string| and returns a dictionary or list
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/// representation. If JSON parsing fails this function returns NULL and
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/// populates |error_msg_out| with a formatted error message.
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/// </summary>
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class function ParseAndReturnError(const jsonString: ustring; options: TCefJsonParserOptions; out errorMsgOut: ustring): ICefValue;
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/// <summary>
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/// Generates a JSON string from the specified root |node|.
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/// Returns an NULL string on failure. This function
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/// requires exclusive access to |node| including any underlying data.
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/// </summary>
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class function Write(const node: ICefValue; options: TCefJsonWriterOptions = JSON_WRITER_DEFAULT): ustring; overload;
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/// <summary>
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/// Generates a JSON string from the specified root |node|.
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/// Returns an NULL string on failure. This function
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/// requires exclusive access to |node| including any underlying data.
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/// </summary>
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class function Write(const node: ICefDictionaryValue; options: TCefJsonWriterOptions = JSON_WRITER_DEFAULT): ustring; overload;
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/// <summary>
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/// Generates a JSON string from the specified root |node|.
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/// Returns an NULL string on failure. This function
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/// requires exclusive access to |node| including any underlying data.
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/// </summary>
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class function Write(const node: ICefValue; var aRsltStrings: TStringList): boolean; overload;
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/// <summary>
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/// Generates a JSON string from the specified root |node|.
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/// Returns an NULL string on failure. This function
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/// requires exclusive access to |node| including any underlying data.
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/// </summary>
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class function Write(const node: ICefDictionaryValue; var aRsltStrings: TStringList): boolean; overload;
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/// <summary>
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/// Saves the JSON data in |node| to a file in aFileName.
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/// </summary>
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class function SaveToFile(const node: ICefValue; const aFileName: ustring): boolean; overload;
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/// <summary>
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/// Saves the JSON data in |node| to a file in aFileName.
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/// </summary>
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class function SaveToFile(const node: ICefDictionaryValue; const aFileName: ustring): boolean; overload;
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/// <summary>
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/// Loads the JSON data in |aFileName| using the |encoding| and returns an ICefValue node in |aRsltNode|.
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/// </summary>
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class function LoadFromFile(const aFileName: ustring; var aRsltNode: ICefValue; {$IFDEF DELPHI12_UP}encoding: TEncoding = nil;{$ENDIF} options: TCefJsonParserOptions = JSON_PARSER_RFC): boolean;
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end;
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implementation
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uses
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uCEFLibFunctions, uCEFApplicationCore, uCEFMiscFunctions, uCEFValue;
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class function TCEFJson.ReadValue(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefValue) : boolean;
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begin
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Result := False;
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aValue := nil;
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if (aDictionary <> nil) then
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begin
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aValue := aDictionary.GetValue(aKey);
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Result := (aValue <> nil);
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end;
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end;
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class function TCEFJson.ReadBoolean(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : boolean) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := False;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_BOOL) then
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begin
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aValue := TempValue.GetBool;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadInteger(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : integer) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := 0;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_INT) then
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begin
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aValue := TempValue.GetInt;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadDouble(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : double) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := 0;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_DOUBLE) then
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begin
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aValue := TempValue.GetDouble;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadString(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ustring) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := '';
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_STRING) then
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begin
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aValue := TempValue.GetString;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadBinary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefBinaryValue) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := nil;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_BINARY) then
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begin
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aValue := TempValue.GetBinary;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadDictionary(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefDictionaryValue) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := nil;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_DICTIONARY) then
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begin
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aValue := TempValue.GetDictionary;
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Result := True;
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end;
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end;
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class function TCEFJson.ReadList(const aDictionary : ICefDictionaryValue; const aKey : string; var aValue : ICefListValue) : boolean;
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var
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TempValue : ICefValue;
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begin
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Result := False;
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aValue := nil;
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if ReadValue(aDictionary, aKey, TempValue) and
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(TempValue.GetType = VTYPE_LIST) then
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begin
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aValue := TempValue.GetList;
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Result := True;
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end;
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end;
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class function TCEFJson.Parse(const jsonString: ustring; options: TCefJsonParserOptions): ICefValue;
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var
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TempJSON : TCefString;
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begin
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if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded then
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begin
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TempJSON := CefString(jsonString);
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Result := TCefValueRef.UnWrap(cef_parse_json(@TempJSON, options));
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end
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else
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Result := nil;
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end;
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// json must be a pointer to a UTF8 string
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class function TCEFJson.Parse(const json: Pointer; json_size: NativeUInt; options: TCefJsonParserOptions): ICefValue;
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begin
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if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded and (json <> nil) and (json_size > 0) then
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Result := TCefValueRef.UnWrap(cef_parse_json_buffer(json, json_size, options))
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else
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Result := nil;
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end;
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class function TCEFJson.ParseAndReturnError(const jsonString : ustring;
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options : TCefJsonParserOptions;
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out errorMsgOut : ustring): ICefValue;
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var
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TempJSON, TempError : TCefString;
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begin
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if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded then
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begin
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CefStringInitialize(@TempError);
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TempJSON := CefString(jsonString);
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Result := TCefValueRef.UnWrap(cef_parse_jsonand_return_error(@TempJSON, options, @TempError));
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errorMsgOut := CefStringClearAndGet(@TempError);
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end
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else
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begin
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Result := nil;
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errorMsgOut := '';
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end;
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end;
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class function TCEFJson.Write(const node: ICefValue; options: TCefJsonWriterOptions): ustring;
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begin
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if (GlobalCEFApp <> nil) and GlobalCEFApp.LibLoaded and (node <> nil) then
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Result := CefStringFreeAndGet(cef_write_json(CefGetData(node), options))
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else
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Result := '';
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end;
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class function TCEFJson.Write(const node: ICefDictionaryValue; options: TCefJsonWriterOptions): ustring;
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var
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TempValue : ICefValue;
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begin
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Result := '';
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if (node = nil) then exit;
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try
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TempValue := TCefValueRef.New;
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TempValue.SetDictionary(node);
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Result := Write(TempValue, options);
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finally
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TempValue := nil;
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end;
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end;
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class function TCEFJson.Write(const node: ICefValue; var aRsltStrings: TStringList): boolean;
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var
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TempJSON : ustring;
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begin
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Result := False;
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if (aRsltStrings <> nil) then
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begin
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TempJSON := Write(node, JSON_WRITER_PRETTY_PRINT);
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if (length(TempJSON) > 0) then
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begin
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aRsltStrings.SetText(@TempJSON[1]);
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Result := True;
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end;
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end;
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end;
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class function TCEFJson.Write(const node: ICefDictionaryValue; var aRsltStrings: TStringList): boolean;
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var
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TempJSON : ustring;
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begin
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Result := False;
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if (aRsltStrings <> nil) then
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begin
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TempJSON := Write(node, JSON_WRITER_PRETTY_PRINT);
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if (length(TempJSON) > 0) then
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begin
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aRsltStrings.SetText(@TempJSON[1]);
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Result := True;
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end;
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end;
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end;
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class function TCEFJson.SaveToFile(const node: ICefValue; const aFileName: ustring): boolean;
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var
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TempJSON : TStringList;
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begin
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Result := False;
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TempJSON := nil;
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try
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try
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TempJSON := TStringList.Create;
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if Write(node, TempJSON) then
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begin
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TempJSON.SaveToFile(aFileName);
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Result := True;
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end;
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except
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on e : exception do
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if CustomExceptionHandler('TCEFJson.SaveToFile', e) then raise;
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end;
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finally
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if (TempJSON <> nil) then FreeAndNil(TempJSON);
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end;
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end;
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class function TCEFJson.SaveToFile(const node: ICefDictionaryValue; const aFileName: ustring): boolean;
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var
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TempJSON : TStringList;
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begin
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Result := False;
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TempJSON := nil;
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try
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try
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TempJSON := TStringList.Create;
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if Write(node, TempJSON) then
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begin
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TempJSON.SaveToFile(aFileName);
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Result := True;
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end;
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except
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on e : exception do
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if CustomExceptionHandler('TCEFJson.SaveToFile', e) then raise;
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end;
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finally
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if (TempJSON <> nil) then FreeAndNil(TempJSON);
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end;
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end;
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class function TCEFJson.LoadFromFile(const aFileName: ustring; var aRsltNode: ICefValue; {$IFDEF DELPHI12_UP}encoding: TEncoding;{$ENDIF} options: TCefJsonParserOptions): boolean;
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var
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TempJSON : TStringList;
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begin
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Result := False;
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TempJSON := nil;
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try
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try
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if (length(aFileName) > 0) and FileExists(aFileName) then
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begin
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TempJSON := TStringList.Create;
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TempJSON.LoadFromFile(aFileName{$IFDEF DELPHI12_UP}, encoding{$ENDIF});
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aRsltNode := Parse(TempJSON.Text, options);
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Result := True;
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end;
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except
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on e : exception do
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if CustomExceptionHandler('TCEFJson.LoadFromFile', e) then raise;
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end;
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finally
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if (TempJSON <> nil) then FreeAndNil(TempJSON);
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end;
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end;
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end.
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