Source/cmMathCommand.cxx

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmMathCommand.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2008-01-23 15:27:59 $
   7   Version:   $Revision: 1.3 $
   8
   9   Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  10   See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #include "cmMathCommand.h"
  18
  19 #include "cmExprParserHelper.h"
  20
  21 //----------------------------------------------------------------------------
  22 bool cmMathCommand
  23 ::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
  24 {
  25   if ( args.size() < 1 )
  26     {
  27     this->SetError("must be called with at least one argument.");
  28     return false;
  29     }
  30   const std::string &subCommand = args[0];
  31   if(subCommand == "EXPR")
  32     {
  33     return this->HandleExprCommand(args);
  34     }
  35   std::string e = "does not recognize sub-command "+subCommand;
  36   this->SetError(e.c_str());
  37   return false;
  38 }
  39
  40 //----------------------------------------------------------------------------
  41 bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
  42 {
  43   if ( args.size() != 3 )
  44     {
  45     this->SetError("EXPR called with incorrect arguments.");
  46     return false;
  47     }
  48
  49   const std::string& outputVariable = args[1];
  50   const std::string& expression = args[2];
  51
  52   cmExprParserHelper helper;
  53   if ( !helper.ParseString(expression.c_str(), 0) )
  54     {
  55     std::string e = "cannot parse the expression: \""+expression+"\": ";
  56     e += helper.GetError();
  57     this->SetError(e.c_str());
  58     return false;
  59     }
  60
  61   char buffer[1024];
  62   sprintf(buffer, "%d", helper.GetResult());
  63
  64   this->Makefile->AddDefinition(outputVariable.c_str(), buffer);
  65   return true;
  66 }