CMake/Source/cmIfCommand.h

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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
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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.
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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.
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=========================================================================*/
#ifndef cmIfCommand_h
#define cmIfCommand_h
#include "cmStandardIncludes.h"
#include "cmCommand.h"
#include "cmFunctionBlocker.h"
/** \class cmIfFunctionBlocker
* \brief subclass of function blocker
*
*
*/
class cmIfFunctionBlocker : public cmFunctionBlocker
{
public:
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cmIfFunctionBlocker() {}
virtual ~cmIfFunctionBlocker() {}
virtual bool IsFunctionBlocked(const cmListFileFunction& lff,
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cmMakefile &mf);
virtual bool ShouldRemove(const cmListFileFunction& lff,
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cmMakefile &mf);
virtual void ScopeEnded(cmMakefile &mf);
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std::vector<cmListFileArgument> m_Args;
bool m_IsBlocking;
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};
/** \class cmIfCommand
* \brief starts an if block
*
* cmIfCommand starts an if block
*/
class cmIfCommand : public cmCommand
{
public:
/**
* This is a virtual constructor for the command.
*/
virtual cmCommand* Clone()
{
return new cmIfCommand;
}
/**
* This overrides the default InvokeInitialPass implementation.
* It records the arguments before expansion.
*/
virtual bool InvokeInitialPass(const std::vector<cmListFileArgument>& args);
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/**
* This is called when the command is first encountered in
* the CMakeLists.txt file.
*/
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virtual bool InitialPass(std::vector<std::string> const&) { return false; }
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/**
* The name of the command as specified in CMakeList.txt.
*/
virtual const char* GetName() { return "IF";}
/**
* Succinct documentation.
*/
virtual const char* GetTerseDocumentation()
{
return "Conditionally execute a group of commands.";
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}
/**
* This determines if the command gets propagated down
* to makefiles located in subdirectories.
*/
virtual bool IsInherited() {return true;}
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/**
* More documentation.
*/
virtual const char* GetFullDocumentation()
{
return
" IF(expression)\n"
" # THEN section.\n"
" COMMAND1(ARGS ...)\n"
" COMMAND2(ARGS ...)\n"
" ...\n"
" ELSE(expression)\n"
" # ELSE section.\n"
" COMMAND1(ARGS ...)\n"
" COMMAND2(ARGS ...)\n"
" ...\n"
" ENDIF(expression)\n"
"Evaluates the given expression. If the result is true, the commands "
"in the THEN section are invoked. Otherwise, the commands in the "
"ELSE section are invoked. The ELSE section is optional. Note that "
"the same expression must be given to IF, ELSE, and ENDIF. Possible "
"expressions are:\n"
" IF(variable)\n"
"True if the variable's value is not empty, 0, FALSE, OFF, or NOTFOUND.\n"
" IF(NOT variable)\n"
"True if the variable's value is empty, 0, FALSE, OFF, or NOTFOUND.\n"
" IF(variable1 AND variable2)\n"
"True if both variables would be considered true individually. Only "
"one AND is allowed to keep expressions short.\n"
" IF(variable1 OR variable2)\n"
"True if either variable would be considered true individually. Only "
"one OR is allowed to keep expressions short.\n"
" IF(COMMAND command-name)\n"
"True if the given name is a command that can be invoked.\n"
" IF(EXISTS file-name)\n"
" IF(EXISTS directory-name)\n"
"True if the named file or directory exists.\n"
" IF(variable MATCHES regex)\n"
" IF(string MATCHES regex)\n"
"True if the given string or variable's value matches the given "
"regular expression.\n"
" IF(variable LESS number)\n"
" IF(string LESS number)\n"
" IF(variable GREATER number)\n"
" IF(string GREATER number)\n"
"True if the given string or variable's value is a valid number and "
"the inequality is true.\n"
" IF(variable STRLESS string)\n"
" IF(string STRLESS string)\n"
" IF(variable STRGREATER string)\n"
" IF(string STRGREATER string)\n"
"True if the given string or variable's value is lexicographically "
"less (or greater) than the string on the right.";
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}
// this is a shared function for both If and Else to determine if
// the arguments were valid, and if so, was the response true
static bool IsTrue(const std::vector<std::string> &args,
bool &isValid, const cmMakefile *mf);
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// Get a definition from the makefile. If it doesn't exist,
// return the original string.
static const char* GetVariableOrString(const char* str,
const cmMakefile* mf);
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cmTypeMacro(cmIfCommand, cmCommand);
};
#endif