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{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
Author: Mattias Gaertner
Abstract:
Demonstrating the TExpressionEvaluator, used for FPC conditionals.
}
program TestExprEval;
{$mode objfpc}{$H+}
uses
FileProcs, ExprEval;
var
e: TExpressionEvaluator;
procedure Test(Expr, ExpectedResult: string);
var
OldResult, NewResult: String;
begin
DebugLn(['Test Expression="',expr,'"']);
OldResult:=e.EvalOld(Expr);
NewResult:=e.Eval(Expr);
DebugLn(['Test eval2 OldResult="',OldResult,'" NewResult="',NewResult,'"']);
if NewResult<>ExpectedResult then
DebugLn(['FATAL: Expression="',expr,'" ExpectedResult="',ExpectedResult,'" <> NewResult="',NewResult,'"']);
end;
begin
e:=TExpressionEvaluator.Create;
e.Variables['A']:='123';
Test('defined A','1');
Test('defined(A)','1');
Test('undefined(A)','0');
Test('not undefined(A)','1');
Test('not defined A','0');
Test('A or B','1');
Test('defined(B)','0');
Test('B or A','1');
Test('defined(B) or defined(A)','1');
Test('defined(B) or not defined(A)','0');
Test('not defined(B) or not defined(A)','1');
Test('not defined(B) or defined(A)','1');
Test('1 << 2','4');
Test('4 >> 1','2');
Test('4 = ''4''','1');
Test('(1+1)=2','1');
Test('(1+(2+4))=7','1');
Test('(1+2*3)=7','1');
e.Free;
end.
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