ENH: Add rudamentary mathematical expression support

1 files changed, 65 insertions, 0 deletions

diff --git a/Source/cmMathCommand.cxx b/Source/cmMathCommand.cxx
new file mode 100644
index 0000000..bbb3edc
--- /dev/null
+++ b/Source/cmMathCommand.cxx
@@ -0,0 +1,65 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmMathCommand.h"
+
+#include "cmExprParserHelper.h"
+
+//----------------------------------------------------------------------------
+bool cmMathCommand::InitialPass(std::vector<std::string> const& args)
+{
+  if ( args.size() < 1 )
+    {
+    this->SetError("must be called with at least one argument.");
+    return false;
+    }
+  const std::string &subCommand = args[0];
+  if(subCommand == "EXPR")
+    {
+    return this->HandleExprCommand(args);
+    }
+  std::string e = "does not recognize sub-command "+subCommand;
+  this->SetError(e.c_str());
+  return false;
+}
+
+//----------------------------------------------------------------------------
+bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
+{
+  if ( args.size() != 3 )
+    {
+    this->SetError("EXPR called with incorrect arguments.");
+    return false;
+    }
+
+  const std::string& outputVariable = args[1];
+  const std::string& expression = args[2];
+  
+  cmExprParserHelper helper;
+  if ( !helper.ParseString(expression.c_str(), 0) )
+    {
+    std::string e = "cannot parse the expression: \""+expression+"\": ";
+    e += helper.GetError();
+    this->SetError(e.c_str());
+    return false;
+    }
+
+  char buffer[1024];
+  sprintf(buffer, "%d", helper.GetResult());
+
+  m_Makefile->AddDefinition(outputVariable.c_str(), buffer);
+  return true;
+}