FastReport_2022_VCL/LibD28/frxAggregate.pas
2024-01-01 16:13:08 +01:00

830 lines
21 KiB
ObjectPascal

{******************************************}
{ }
{ FastReport VCL }
{ Aggregate Functions }
{ }
{ Copyright (c) 1998-2021 }
{ by Fast Reports Inc. }
{ }
{******************************************}
unit frxAggregate;
interface
{$I frx.inc}
uses
{$IFNDEF FPC}
Windows,
{$ENDIF}
SysUtils, Classes, Dialogs, frxClass
{$IFDEF Delphi6}
, Variants
{$ENDIF};
type
TfrxAggregateFunction = (agSum, agAvg, agMin, agMax, agCount);
TfrxAggregateItem = class(TObject)
private
FAggregateFunction: TfrxAggregateFunction;
FDataRow: TfrxComponent;
FCountInvisibleBands: Boolean;
FDontReset: Boolean;
FExpression: String;
FIsPageFooter: Boolean;
FItemsArray: Variant; { used for vbands }
FItemsCount: Integer;
FItemsCountArray: Variant; { used for vbands }
FItemsValue: Variant;
FKeeping: Boolean;
FLastCount: Integer;
FLastValue: Variant;
{ used in Save/Restore }
FSavedCount: Integer;
FSavedValue: Variant;
FMemoName: String;
FOriginalName: String;
FParentContainer: TfrxComponent;
FReport: TfrxReport;
FTempItemsCount: Integer;
FTempItemsValue: Variant;
FVColumn: Integer; { used for vbands }
public
procedure Calc(AValue: Variant);
procedure DeleteValue;
procedure SaveValue;
procedure RestoreValue;
procedure Reset;
procedure StartKeep;
procedure EndKeep;
function Value: Variant;
property DataRow: TfrxComponent read FDataRow;
end;
TfrxAggregateList = class(TfrxCustomAggregateList)
private
FList: TList;
FReport: TfrxReport;
function GetItem(Index: Integer): TfrxAggregateItem;
procedure FindAggregate(AComponent: TfrxComponent; const Text: String; const ExpressionDelimiters: String; DataRow: TfrxComponent; AList: TList = nil; MainParent: TfrxComponent = nil; IsAggregatedObj: Boolean = False); overload;
procedure FindAggregate(Memo: TfrxCustomMemoView; DataRow: TfrxComponent); overload;
procedure ParseName(const ComplexName: String; var Func: TfrxAggregateFunction;
var Expr: String; var DataRow: TfrxComponent; var CountInvisible, DontReset: Boolean; MainParent: TfrxComponent = nil; IsAggregatedObj: Boolean = False);
property Items[Index: Integer]: TfrxAggregateItem read GetItem; default;
public
constructor Create(AReport: TfrxReport);
destructor Destroy; override;
procedure Clear; override;
procedure ClearValues; override;
procedure AddItems(Page: TfrxReportPage); override;
function AddAggregatedItem(AObject: IfrxAggregateObject; Container: TfrxComponent; AList: TList = nil): Boolean; override;
procedure AddValue(DataRow: TfrxComponent; VColumn: Integer = 0); override;
function AddCalculatedValue(DataRow: TfrxComponent; const Value: Variant; VColumn: Integer = 0): Boolean; override;
procedure DeleteValue(DataRow: TfrxComponent); override;
procedure SaveValue(DataRow: TfrxComponent); override;
procedure RestoreValue(DataRow: TfrxComponent); override;
procedure EndKeep; override;
procedure Reset(ParentContainer: TfrxComponent); override;
procedure StartKeep; override;
function GetValue(ParentContainer: TfrxComponent; const ComplexName: String;
VColumn: Integer = 0): Variant; overload; override;
function GetValue(ParentContainer: TfrxComponent; VColumn: Integer;
const Name, Expression: String; DataRow: TfrxComponent; Flags: Integer): Variant; overload; override;
end;
implementation
uses frxVariables, frxUtils;
type
THackComponent = class(TfrxComponent);
procedure Get3Params(const s: String; var i: Integer;
var s1, s2, s3: String);
var
c, d, e, oi, ci: Integer;
begin
s1 := ''; s2 := ''; s3 := '';
c := 1; d := 1; e := 1; oi := i + 1; ci := 1;
repeat
Inc(i);
if s[i] = '''' then
if (d = 1) and (e = 1) then Inc(d) else d := 1;
if (d = 1) and (s[i] = '"') then
if e = 1 then Inc(e) else e := 1;
if (d = 1) and (e = 1) then
begin
if s[i] = '(' then
Inc(c) else
if s[i] = ')' then Dec(c);
if (s[i] = ',') and (c = 1) then
begin
if ci = 1 then
s1 := Copy(s, oi, i - oi) else
s2 := Copy(s, oi, i - oi);
oi := i + 1; Inc(ci);
end;
end;
until (c = 0) or (i >= Length(s));
case ci of
1: s1 := Copy(s, oi, i - oi);
2: s2 := Copy(s, oi, i - oi);
3: s3 := Copy(s, oi, i - oi);
end;
Inc(i);
end;
{ TfrxAggregateItem }
procedure TfrxAggregateItem.Calc(AValue: Variant);
var
i: Integer;
begin
if Assigned(FDataRow) and not FDataRow.Visible and not FCountInvisibleBands then Exit;
FReport.CurObject := FMemoName;
if FAggregateFunction <> agCount then
begin
if AValue = Null then
AValue := FReport.Calc(FExpression);
end
else
AValue := Null;
if VarType(AValue) = varBoolean then
if AValue = True then
AValue := 1;
{ process vbands }
if FVColumn > 0 then
begin
if VarIsNull(FItemsArray) then
begin
FItemsArray := VarArrayCreate([0, 1000], varVariant);
FItemsCountArray := VarArrayCreate([0, 1000], varVariant);
for i := 0 to 1000 do
begin
FItemsArray[i] := Null;
FItemsCountArray[i] := 0;
end;
end;
if (FAggregateFunction <> agAvg) or (AValue <> Null) then
FItemsCountArray[FVColumn] := FItemsCountArray[FVColumn] + 1;
if FItemsArray[FVColumn] = Null then
FItemsArray[FVColumn] := AValue
else if AValue <> Null then
case FAggregateFunction of
agSum, agAvg:
FItemsArray[FVColumn] := FItemsArray[FVColumn] + AValue;
agMin:
if AValue < FItemsArray[FVColumn] then
FItemsArray[FVColumn] := AValue;
agMax:
if AValue > FItemsArray[FVColumn] then
FItemsArray[FVColumn] := AValue;
end;
end
else if FKeeping then
begin
if (FAggregateFunction <> agAvg) or (AValue <> Null) then
Inc(FTempItemsCount);
if FTempItemsValue = Null then
FTempItemsValue := AValue
else if AValue <> Null then
case FAggregateFunction of
agSum, agAvg:
FTempItemsValue := FTempItemsValue + AValue;
agMin:
if AValue < FTempItemsValue then
FTempItemsValue := AValue;
agMax:
if AValue > FTempItemsValue then
FTempItemsValue := AValue;
end;
end
else
begin
FLastCount := FItemsCount;
FLastValue := FItemsValue;
if (FAggregateFunction <> agAvg) or (AValue <> Null) then
Inc(FItemsCount);
if FItemsValue = Null then
FItemsValue := AValue
else if AValue <> Null then
case FAggregateFunction of
agSum, agAvg:
FItemsValue := FItemsValue + AValue;
agMin:
if AValue < FItemsValue then
FItemsValue := AValue;
agMax:
if AValue > FItemsValue then
FItemsValue := AValue;
end;
end;
end;
procedure TfrxAggregateItem.DeleteValue;
begin
FItemsCount := FLastCount;
FItemsValue := FLastValue;
end;
procedure TfrxAggregateItem.Reset;
begin
if FDontReset and (FItemsCount <> 0) then Exit;
FItemsCount := 0;
FItemsValue := Null;
FItemsArray := Null;
FItemsCountArray := Null;
end;
procedure TfrxAggregateItem.RestoreValue;
begin
FItemsCount := FSavedCount;
FItemsValue := FSavedValue;
end;
procedure TfrxAggregateItem.SaveValue;
begin
FSavedCount := FItemsCount;
FSavedValue := FItemsValue;
end;
procedure TfrxAggregateItem.StartKeep;
begin
if not FIsPageFooter or FKeeping then Exit;
FKeeping := True;
FTempItemsCount := 0;
FTempItemsValue := Null;
end;
procedure TfrxAggregateItem.EndKeep;
begin
if not FIsPageFooter or not FKeeping then Exit;
FKeeping := False;
FItemsCount := FItemsCount + FTempItemsCount;
if FItemsValue = Null then
FItemsValue := FTempItemsValue
else if FTempItemsValue <> Null then
case FAggregateFunction of
agMin:
if FTempItemsValue < FItemsValue then
FItemsValue := FTempItemsValue;
agMax:
if FTempItemsValue > FItemsValue then
FItemsValue := FTempItemsValue;
else
FItemsValue := FItemsValue + FTempItemsValue;
end;
end;
function TfrxAggregateItem.Value: Variant;
begin
Result := Null;
if not VarIsNull(FItemsArray) then
begin
case FAggregateFunction of
agSum, agMin, agMax:
Result := FItemsArray[FVColumn];
agAvg:
Result := FItemsArray[FVColumn] / FItemsCountArray[FVColumn];
agCount:
Result := FItemsCountArray[FVColumn];
end
end
else
case FAggregateFunction of
agSum, agMin, agMax:
Result := FItemsValue;
agAvg:
Result := FItemsValue / FItemsCount;
agCount:
Result := FItemsCount;
end;
if VarIsNull(Result) then
Result := 0;
end;
{ TfrxAggregateList }
constructor TfrxAggregateList.Create(AReport: TfrxReport);
begin
FList := TList.Create;
FReport := AReport;
end;
destructor TfrxAggregateList.Destroy;
begin
Clear;
FList.Free;
inherited;
end;
procedure TfrxAggregateList.Clear;
begin
while FList.Count > 0 do
begin
TObject(FList[0]).Free;
FList.Delete(0);
end;
end;
function TfrxAggregateList.GetItem(Index: Integer): TfrxAggregateItem;
begin
Result := TfrxAggregateItem(FList[Index]);
end;
procedure TfrxAggregateList.ParseName(const ComplexName: String;
var Func: TfrxAggregateFunction; var Expr: String; var DataRow: TfrxComponent;
var CountInvisible, DontReset: Boolean; MainParent: TfrxComponent; IsAggregatedObj: Boolean);
var
i: Integer;
Name, Param1, Param2, Param3: String;
begin
{$IFDEF FPC}
Param1 := '';
Param2 := '';
Param3 := '';
{$ENDIF}
if MainParent = nil then
MainParent := FReport;
i := Pos('(', ComplexName);
Name := UpperCase(Trim(Copy(ComplexName, 1, i - 1)));
Get3Params(ComplexName, i, Param1, Param2, Param3);
Param1 := Trim(Param1);
Param2 := Trim(Param2);
Param3 := Trim(Param3);
if Name = 'SUM' then
Func := agSum
else if Name = 'MIN' then
Func := agMin
else if Name = 'MAX' then
Func := agMax
else if Name = 'AVG' then
Func := agAvg
else //if Name = 'COUNT' then
Func := agCount;
if (Name <> 'COUNT') and not (IsAggregatedObj and (Param2 = '') and (Param3 = '')) then
begin
Expr := Param1;
if Param2 <> '' then
DataRow := MainParent.FindObject(Param2) else
DataRow := nil;
if Param3 <> '' then
i := StrToInt(Param3) else
i := 0;
end
else
begin
Expr := '';
DataRow := MainParent.FindObject(Param1);
if Param2 <> '' then
i := StrToInt(Param2) else
i := 0;
end;
CountInvisible := (i and 1) <> 0;
DontReset := (i and 2) <> 0;
end;
procedure TfrxAggregateList.FindAggregate(Memo: TfrxCustomMemoView;
DataRow: TfrxComponent);
begin
if Memo.AllowExpressions then
FindAggregate(Memo, Memo.Text, Memo.ExpressionDelimiters, DataRow);
end;
function TfrxAggregateList.AddAggregatedItem(AObject: IfrxAggregateObject;
Container: TfrxComponent; AList: TList): Boolean;
var
i: Integer;
begin
i := FList.Count;
FindAggregate(AObject.GetInstance, AObject.GetExpression, AObject.GetExpressionDelimiters, Container, AList, AObject.GetDataRowContainer, True);
Result := i <> FList.Count;
end;
function TfrxAggregateList.AddCalculatedValue(DataRow: TfrxComponent;
const Value: Variant; VColumn: Integer): Boolean;
var
i: Integer;
begin
Result := False;
for i := 0 to FList.Count - 1 do
if Items[i].FDataRow = DataRow then
begin
Result := True;
Items[i].FVColumn := VColumn;
Items[i].Calc(Value);
end;
end;
procedure TfrxAggregateList.AddItems(Page: TfrxReportPage);
procedure EnumObjects(ParentBand: TfrxBand; DataBand: TfrxDataBand);
var
i: Integer;
c: TfrxComponent;
AllObjects: TList;
begin
if ParentBand = nil then Exit;
AllObjects := ParentBand.AllObjects;
for i := 0 to AllObjects.Count - 1 do
begin
c := TfrxComponent(AllObjects[i]);
if c is TfrxCustomMemoView then
FindAggregate(TfrxCustomMemoView(c), DataBand);
end;
if ParentBand.Child <> nil then
EnumObjects(ParentBand.Child, DataBand);
end;
procedure EnumGroups(GroupHeader: TfrxGroupHeader; DataBand: TfrxDataBand);
var
i: Integer;
g: TfrxGroupHeader;
begin
if GroupHeader = nil then Exit;
for i := 0 to GroupHeader.FSubBands.Count - 1 do
begin
g := TfrxGroupHeader(GroupHeader.FSubBands[i]);
EnumObjects(g.FFooter, DataBand);
end;
end;
procedure EnumDataBands(List: TList);
var
i: Integer;
d: TfrxDataBand;
begin
for i := 0 to List.Count - 1 do
begin
d := TfrxDataBand(List[i]);
EnumObjects(d.FFooter, d);
EnumGroups(TfrxGroupHeader(d.FGroup), d);
EnumDataBands(d.FSubBands);
if d.Vertical then
EnumObjects(d, d);
end;
end;
begin
EnumDataBands(Page.FSubBands);
EnumDataBands(Page.FVSubBands);
if Page.FSubBands.Count > 0 then
begin
EnumObjects(Page.FindBand(TfrxPageFooter), TfrxDataBand(Page.FSubBands[0]));
EnumObjects(Page.FindBand(TfrxColumnFooter), TfrxDataBand(Page.FSubBands[0]));
EnumObjects(Page.FindBand(TfrxReportSummary), TfrxDataBand(Page.FSubBands[0]));
end;
end;
procedure TfrxAggregateList.AddValue(DataRow: TfrxComponent; VColumn: Integer = 0);
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
if Items[i].FDataRow = DataRow then
begin
Items[i].FVColumn := VColumn;
Items[i].Calc(Null);
end;
end;
procedure TfrxAggregateList.DeleteValue(DataRow: TfrxComponent);
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
if Items[i].FDataRow = DataRow then
Items[i].DeleteValue;
end;
function TfrxAggregateList.GetValue(ParentContainer: TfrxComponent;
const ComplexName: String; VColumn: Integer = 0): Variant;
var
i: Integer;
begin
Result := Null;
for i := 0 to FList.Count - 1 do
if (Items[i].FParentContainer = ParentContainer) and
(AnsiCompareText(Items[i].FOriginalName, Trim(ComplexName)) = 0) then
begin
Items[i].FVColumn := VColumn;
Result := Items[i].Value;
break;
end;
end;
function TfrxAggregateList.GetValue(ParentContainer: TfrxComponent; VColumn: Integer;
const Name, Expression: String; DataRow: TfrxComponent; Flags: Integer): Variant;
var
i: Integer;
fn: TfrxAggregateFunction;
AggObject: IfrxAggregateObject;
begin
{ TODO: move aggregates to interfaces }
{ remove depency from FCurBand }
if Supports(DataRow, IfrxAggregateObject, AggObject) then
ParentContainer := AggObject.GetParentContainer;
Result := Null;
if Name = 'SUM' then
fn := agSum
else if Name = 'AVG' then
fn := agAvg
else if Name = 'MIN' then
fn := agMin
else if Name = 'MAX' then
fn := agMax
else
fn := agCount;
for i := 0 to FList.Count - 1 do
if ((Items[i].FParentContainer = ParentContainer){ or (Items[i].FParentContainer = nil)}) and
(Items[i].FAggregateFunction = fn) and
(AnsiCompareText(Items[i].FExpression, Trim(Expression)) = 0) and
((DataRow = nil) or (Items[i].FDataRow = DataRow)) and
(Items[i].FCountInvisibleBands = ((Flags and 1) <> 0)) and
(Items[i].FDontReset = ((Flags and 2) <> 0)) then
begin
Items[i].FVColumn := VColumn;
Result := Items[i].Value;
break;
end;
end;
procedure TfrxAggregateList.Reset(ParentContainer: TfrxComponent);
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
if Items[i].FParentContainer = ParentContainer then
Items[i].Reset;
end;
procedure TfrxAggregateList.RestoreValue(DataRow: TfrxComponent);
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
if Items[i].FDataRow = DataRow then
Items[i].RestoreValue;
end;
procedure TfrxAggregateList.SaveValue(DataRow: TfrxComponent);
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
if Items[i].FDataRow = DataRow then
Items[i].SaveValue;
end;
procedure TfrxAggregateList.StartKeep;
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
Items[i].StartKeep;
end;
procedure TfrxAggregateList.EndKeep;
var
i: Integer;
begin
for i := 0 to FList.Count - 1 do
Items[i].EndKeep;
end;
procedure TfrxAggregateList.FindAggregate(AComponent: TfrxComponent;
const Text: String; const ExpressionDelimiters: String; DataRow: TfrxComponent; AList: TList; MainParent: TfrxComponent; IsAggregatedObj: Boolean);
const
Spaces = [#1..#32, '!', '#', '$', '%', '^', '&', '|', '+', '-', '*', '/',
'=', '.', ',', '[', ']', '0'..'9'];
IdentSpaces = Spaces - ['0'..'9'] + ['('];
var
i, j: Integer;
//s,
s1, dc1, dc2: String;
Report: TfrxReport;
procedure FindIn(const s: String); forward;
procedure SkipString(const s: String; var i: Integer);
var
ch: Char;
begin
ch := s[i];
Inc(i);
while (i <= Length(s)) and (s[i] <> ch) do
Inc(i);
Inc(i);
end;
function Check(s: String): Boolean;
var
i: Integer;
ds: TfrxDataSet;
s1: String;
VarVal: Variant;
begin
Result := False;
if s = '' then Exit;
{$IFDEF FPC}
ds := nil;
s1 := '';
{$ENDIF}
{ searching in the variables }
i := Report.Variables.IndexOf(s);
if i <> -1 then
begin
VarVal := Report.Variables.Items[i].Value;
if VarIsNull(VarVal) then
s := ''
else
s := VarVal;
FindIn(s);
Result := True;
Exit;
end;
{ maybe it's a dataset/field? }
Report.GetDataSetAndField(s, ds, s1);
if (ds <> nil) and (s1 <> '') then
Result := True;
end;
function GetParentAggContainer(c: TfrxComponent): TfrxComponent;
var
AggObj: IfrxAggregateObject;
begin
if Supports(c, IfrxAggregateObject, AggObj) then
begin
Result := AggObj.GetParentContainer;
Exit;
end;
Result := c.Parent;
while Assigned(Result) and not (Result is TfrxBand) do
Result := Result.Parent;
end;
procedure AddAggregate(const ComplexName: String);
var
Item: TfrxAggregateItem;
begin
Item := TfrxAggregateItem.Create;
AList.Add(Item);
ParseName(ComplexName, Item.FAggregateFunction, Item.FExpression,
Item.FDataRow, Item.FCountInvisibleBands, Item.FDontReset, MainParent, IsAggregatedObj);
if Item.FDataRow = nil then
Item.FDataRow := DataRow;
Item.FReport := FReport;
Item.FParentContainer := GetParentAggContainer(AComponent);
// change to an interface
if (Item.FParentContainer is TfrxBand) and TfrxBand(Item.FParentContainer).Vertical and (THackComponent(AComponent).FOriginalBand <> nil) and
(TfrxBand(THackComponent(AComponent).FOriginalBand).BandNumber in [1, 3, 5, 13]) then
Item.FParentContainer := TfrxBand(THackComponent(AComponent).FOriginalBand);
Item.FIsPageFooter := Item.FParentContainer is TfrxPageFooter;
Item.FOriginalName := Trim(ComplexName);
Item.FMemoName := AComponent.Name;
Item.Reset;
end;
procedure FindIn(const s: String);
var
i, j: Integer;
s1, s2, s3, s4: String;
begin
if Check(s) then
Exit;
{ this is an expression }
i := 1;
while i <= Length(s) do
begin
{ skip non-significant chars }
{$IFDEF Delphi12}
while (i <= Length(s)) and (CharInSet(s[i], Spaces)) do
{$ELSE}
while (i <= Length(s)) and (s[i] in Spaces) do
{$ENDIF}
Inc(i);
case s[i] of
'<':
begin
{$IFDEF Delphi12}
FindIn(frxGetBrackedVariableW(s, '<', '>', i, j));
{$ELSE}
FindIn(frxGetBrackedVariable(s, '<', '>', i, j));
{$ENDIF}
i := j;
end;
'''', '"':
SkipString(s, i);
'(':
begin
{$IFDEF Delphi12}
FindIn(frxGetBrackedVariableW(s, '(', ')', i, j));
{$ELSE}
FindIn(frxGetBrackedVariable(s, '(', ')', i, j));
{$ENDIF}
if i = j then
Inc(i) else
i := j;
end;
else
begin
j := i;
{$IFDEF Delphi12}
while (i <= Length(s)) and not (CharInSet(s[i], IdentSpaces)) do
{$ELSE}
while (i <= Length(s)) and not (s[i] in IdentSpaces) do
{$ENDIF}
Inc(i);
s1 := UpperCase(Copy(s, j, i - j));
if (s1 = 'SUM') or (s1 = 'MIN') or (s1 = 'MAX') or
(s1 = 'AVG') or (s1 = 'COUNT') then
begin
if (i < Length(s)) and (s[i] = '(') then
begin
Get3Params(s, i, s2, s3, s4);
AddAggregate(Copy(s, j, i - j));
end;
end
else
Check(s1);
end;
end;
end;
end;
begin
if not Assigned(AList) then
AList := FList;
Report := AComponent.Report;
// if Memo.AllowExpressions then
begin
//s := Memo.Text;
i := 1;
dc1 := ExpressionDelimiters;
dc2 := Copy(dc1, Pos(',', dc1) + 1, 255);
dc1 := Copy(dc1, 1, Pos(',', dc1) - 1);
repeat
while (i < Length(Text)) and (Copy(Text, i, Length(dc1)) <> dc1) do Inc(i);
{$IFDEF Delphi12}
s1 := frxGetBrackedVariableW(Text, dc1, dc2, i, j);
{$ELSE}
s1 := frxGetBrackedVariable(Text, dc1, dc2, i, j);
{$ENDIF}
if i <> j then
begin
FindIn(s1);
i := j;
j := 0;
end;
until i = j;
end;
end;
procedure TfrxAggregateList.ClearValues;
var
i: Integer;
SaveReset: Boolean;
begin
for i := 0 to FList.Count - 1 do
begin
SaveReset := Items[i].FDontReset;
Items[i].FDontReset := False;
Items[i].Reset;
Items[i].FDontReset := SaveReset;
end;
end;
end.