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(* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TurboPower SysTools
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*
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* The Initial Developer of the Original Code is
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* TurboPower Software
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*
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* Portions created by the Initial Developer are Copyright (C) 1996-2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** *)
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unit ExExpr2U;
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interface
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uses
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Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls,
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StExpr, StBase, StConst;
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type
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TForm1 = class(TForm)
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Button1: TButton;
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edVar1: TEdit;
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edVar2: TEdit;
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edFunc1Param: TEdit;
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edMeth1Param: TEdit;
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edFunc0Param: TEdit;
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edMeth0Param: TEdit;
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edFunc2Param: TEdit;
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edFunc3Param: TEdit;
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edMeth2Param: TEdit;
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edMeth3Param: TEdit;
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lblVar1: TLabel;
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lblVar2: TLabel;
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lblFunc1: TLabel;
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lblMeth1: TLabel;
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lblFunc0: TLabel;
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lblMeth0: TLabel;
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lblMeth2: TLabel;
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lblFunc2: TLabel;
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lblFunc3: TLabel;
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lblMeth3: TLabel;
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Label1: TLabel;
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Label2: TLabel;
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Label3: TLabel;
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Label4: TLabel;
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Label5: TLabel;
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Label6: TLabel;
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Label7: TLabel;
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Label8: TLabel;
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StExpressionEdit1: TStExpressionEdit;
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ListBox1: TListBox;
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Exp: TStExpression;
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Label9: TLabel;
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Label10: TLabel;
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lblError: TLabel;
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procedure Button1Click(Sender: TObject);
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procedure StExpressionEdit1AddIdentifier(Sender: TObject);
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procedure StExpressionEdit1Error(Sender: TObject; ErrorNumber: Longint;
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const ErrorStr: string);
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private
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{ Private declarations }
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public
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{ Public declarations }
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Ref : TStFloat;
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function MyMethod0Param : TStFloat;
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function MyMethod1Param(Value : TStFloat) : TStFloat;
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function MyMethod2Param(Value1, Value2 : TStFloat) : TStFloat;
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function MyMethod3Param(Value1, Value2, Value3 : TStFloat) : TStFloat;
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end;
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var
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Form1: TForm1;
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implementation
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{$R *.DFM}
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function MyFunc0Param : TStFloat; far;
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begin
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Result := 10;
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end;
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function MyFunc1Param(Value : TStFloat) : TStFloat; far;
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begin
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Result := Value * 10;
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end;
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function MyFunc2Param(Value1, Value2 : TStFloat) : TStFloat; far;
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begin
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Result := Value1 + Value2;
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end;
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function MyFunc3Param(Value1, Value2, Value3 : TStFloat) : TStFloat; far;
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begin
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Result := Value1 + Value2 + Value3;
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end;
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function TForm1.MyMethod0Param : TStFloat;
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begin
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Result := 10;
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end;
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function TForm1.MyMethod1Param(Value : TStFloat) : TStFloat;
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begin
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Result := Value * 10;
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end;
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function TForm1.MyMethod2Param(Value1, Value2 : TStFloat) : TStFloat;
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begin
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Result := Value1 + Value2;
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end;
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function TForm1.MyMethod3Param(Value1, Value2, Value3 : TStFloat) : TStFloat;
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begin
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Result := Value1 + Value2 + Value3;
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end;
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procedure TForm1.Button1Click(Sender: TObject);
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begin
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Exp.ClearIdentifiers;
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Exp.AddInternalFunctions;
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{add variables and functions}
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Exp.AddConstant('X', 5.5);
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Exp.AddVariable('Ref', @Ref);
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Exp.AddFunction0Param('Func0', MyFunc0Param);
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Exp.AddFunction1Param('Func1', MyFunc1Param);
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Exp.AddFunction2Param('Func2', MyFunc2Param);
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Exp.AddFunction3Param('Func3', MyFunc3Param);
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Exp.AddMethod0Param('Meth0', MyMethod0Param);
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Exp.AddMethod1Param('Meth1', MyMethod1Param);
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Exp.AddMethod2Param('Meth2', MyMethod2Param);
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Exp.AddMethod3Param('Meth3', MyMethod3Param);
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Ref := 6.6;
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Exp.Expression := 'X * 2';
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lblVar1.Caption := Exp.Expression;
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edVar1.Text := Exp.AsString;
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Ref := 7.6;
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Exp.Expression := '(X * 2) + Ref';
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lblVar2.Caption := Exp.Expression;
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edVar2.Text := Exp.AsString;
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Exp.AddFunction0Param('Func0', MyFunc0Param);
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Exp.Expression := 'Func0';
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lblFunc0.Caption := Exp.Expression;
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edFunc0Param.Text := Exp.AsString;
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Exp.AddFunction1Param('Func1', MyFunc1Param);
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Exp.Expression := 'Func1(50)';
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lblFunc1.Caption := Exp.Expression;
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edFunc1Param.Text := Exp.AsString;
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Exp.AddFunction2Param('Func2', MyFunc2Param);
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Exp.Expression := 'Func2(50' + ListSeparator + ' 2)';
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lblFunc2.Caption := Exp.Expression;
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edFunc2Param.Text := Exp.AsString;
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Exp.AddFunction3Param('Func3', MyFunc3Param);
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Exp.Expression := 'Func3(50' + ListSeparator + ' 2' + ListSeparator + ' 30)';
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lblFunc3.Caption := Exp.Expression;
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edFunc3Param.Text := Exp.AsString;
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Exp.AddMethod0Param('Meth0', MyMethod0Param);
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Exp.Expression := 'Meth0';
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lblMeth0.Caption := Exp.Expression;
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edMeth0Param.Text := Exp.AsString;
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Exp.AddMethod1Param('Meth1', MyMethod1Param);
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Exp.Expression := 'Meth1(50)';
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lblMeth1.Caption := Exp.Expression;
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edMeth1Param.Text := Exp.AsString;
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Exp.AddMethod2Param('Meth2', MyMethod2Param);
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Exp.Expression := 'Meth2(50' + ListSeparator + ' 2)';
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lblMeth2.Caption := Exp.Expression;
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edMeth2Param.Text := Exp.AsString;
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Exp.AddMethod3Param('Meth3', MyMethod3Param);
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Exp.Expression := 'Meth3(50' + ListSeparator + ' 2' + ListSeparator + ' 30)';
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lblMeth3.Caption := Exp.Expression;
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edMeth3Param.Text := Exp.AsString;
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end;
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procedure TForm1.StExpressionEdit1AddIdentifier(Sender: TObject);
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begin
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StExpressionEdit1.Expr.GetIdentList(ListBox1.Items);
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end;
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procedure TForm1.StExpressionEdit1Error(Sender: TObject;
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ErrorNumber: Longint; const ErrorStr: string);
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begin
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if ErrorNumber > 0 then
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lblError.Caption := ErrorStr
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else
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lblError.Caption := '';
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end;
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end.
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