Source/cmMacroCommand.h

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmMacroCommand.h,v $
   5   Language:  C++
   6   Date:      $Date: 2008-01-23 15:27:59 $
   7   Version:   $Revision: 1.16 $
   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 #ifndef cmMacroCommand_h
  18 #define cmMacroCommand_h
  19
  20 #include "cmCommand.h"
  21 #include "cmFunctionBlocker.h"
  22
  23 /** \class cmMacroFunctionBlocker
  24  * \brief subclass of function blocker
  25  *
  26  *
  27  */
  28 class cmMacroFunctionBlocker : public cmFunctionBlocker
  29 {
  30 public:
  31   cmMacroFunctionBlocker() {this->Depth=0;}
  32   virtual ~cmMacroFunctionBlocker() {}
  33   virtual bool IsFunctionBlocked(const cmListFileFunction&,
  34                                  cmMakefile &mf,
  35                                  cmExecutionStatus &);
  36   virtual bool ShouldRemove(const cmListFileFunction&, cmMakefile &mf);
  37   virtual void ScopeEnded(cmMakefile &mf);
  38
  39   std::vector<std::string> Args;
  40   std::vector<cmListFileFunction> Functions;
  41   int Depth;
  42 };
  43
  44 /** \class cmMacroCommand
  45  * \brief starts an if block
  46  *
  47  * cmMacroCommand starts an if block
  48  */
  49 class cmMacroCommand : public cmCommand
  50 {
  51 public:
  52   /**
  53    * This is a virtual constructor for the command.
  54    */
  55   virtual cmCommand* Clone()
  56     {
  57     return new cmMacroCommand;
  58     }
  59
  60   /**
  61    * This is called when the command is first encountered in
  62    * the CMakeLists.txt file.
  63    */
  64   virtual bool InitialPass(std::vector<std::string> const& args,
  65                            cmExecutionStatus &status);
  66
  67   /**
  68    * This determines if the command is invoked when in script mode.
  69    */
  70   virtual bool IsScriptable() { return true; }
  71
  72   /**
  73    * The name of the command as specified in CMakeList.txt.
  74    */
  75   virtual const char* GetName() { return "macro";}
  76
  77   /**
  78    * Succinct documentation.
  79    */
  80   virtual const char* GetTerseDocumentation()
  81     {
  82     return "Start recording a macro for later invocation as a command.";
  83     }
  84
  85   /**
  86    * More documentation.
  87    */
  88   virtual const char* GetFullDocumentation()
  89     {
  90     return
  91       "  macro(<name> [arg1 [arg2 [arg3 ...]]])\n"
  92       "    COMMAND1(ARGS ...)\n"
  93       "    COMMAND2(ARGS ...)\n"
  94       "    ...\n"
  95       "  endmacro(<name>)\n"
  96       "Define a macro named <name> that takes arguments named "
  97       "arg1 arg2 arg3 (...).  Commands listed after macro, "
  98       "but before the matching endmacro, are not invoked until the macro "
  99       "is invoked.  When it is invoked, the commands recorded in the "
 100       "macro are first modified by replacing formal parameters (${arg1}) "
 101       "with the arguments passed, and then invoked as normal commands. In "
 102       "addition to referencing the formal parameters you can reference "
 103       "the values ${ARGC} which will be set to the number of arguments "
 104       "passed into the function as well as ${ARGV0} ${ARGV1} ${ARGV2} "
 105       "... which "
 106       "will have the actual values of the arguments passed in. This "
 107       "facilitates creating macros with optional arguments. Additionally "
 108       "${ARGV} holds the list of all arguments given to the macro and "
 109       "${ARGN} "
 110       "holds the list of argument pass the last expected argument. "
 111       "Note that the parameters to a macro and values such as ARGN "
 112       "are not variables in the usual CMake sense. They are string "
 113       "replacements much like the c preprocessor would do with a "
 114       "macro. If you want true CMake variables you should look at "
 115       "the function command.";
 116     }
 117
 118   cmTypeMacro(cmMacroCommand, cmCommand);
 119 };
 120
 121
 122 #endif