ENH: Add rudamentary mathematical expression support

Source/cmMathCommand.h

@@ -0,0 +1,80 @@
+/*=========================================================================
+
+  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.
+
+=========================================================================*/
+#ifndef cmMathCommand_h
+#define cmMathCommand_h
+
+#include "cmCommand.h"
+
+/** \class cmMathCommand
+ * \brief Common string operations
+ *
+ */
+class cmMathCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmMathCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args);
+
+  /**
+   * This determines if the command is invoked when in script mode.
+   */
+  virtual bool IsScriptable() { return true; }
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "MATH";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Mathematical expressions.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "  MATH(EXPR <output variable> <math expression>)\n"
+      "EXPR evaluates mathematical expression and return result in the "
+      "output variable. Example mathematical expression is '5 * ( 10 + 13 )'.";
+    }
+  
+  cmTypeMacro(cmMathCommand, cmCommand);
+protected:
+ 
+  bool HandleExprCommand(std::vector<std::string> const& args);
+};
+
+
+#endif
+