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/*=========================================================================
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 cmIfCommand_h
#define cmIfCommand_h
#include "cmCommand.h"
#include "cmFunctionBlocker.h"
/** \class cmIfFunctionBlocker
* \brief subclass of function blocker
*
*
*/
class cmIfFunctionBlocker : public cmFunctionBlocker
{
public:
cmIfFunctionBlocker() {
this->HasRun = false; this->ScopeDepth = 0; }
virtual ~cmIfFunctionBlocker() {}
virtual bool IsFunctionBlocked(const cmListFileFunction& lff,
cmMakefile &mf,
cmExecutionStatus &);
virtual bool ShouldRemove(const cmListFileFunction& lff,
cmMakefile &mf);
std::vector<cmListFileArgument> Args;
std::vector<cmListFileFunction> Functions;
bool IsBlocking;
bool HasRun;
unsigned int ScopeDepth;
};
/** \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,
cmExecutionStatus &);
/**
* This is called when the command is first encountered in
* the CMakeLists.txt file.
*/
virtual bool InitialPass(std::vector<std::string> const&,
cmExecutionStatus &) { return false;};
/**
* 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.";
}
/**
* This determines if the command is invoked when in script mode.
*/
virtual bool IsScriptable() { return true; }
/**
* More documentation.
*/
virtual const char* GetFullDocumentation()
{
return
" if(expression)\n"
" # then section.\n"
" COMMAND1(ARGS ...)\n"
" COMMAND2(ARGS ...)\n"
" ...\n"
" elseif(expression2)\n"
" # elseif 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 elseif and else sections are "
"optional. You may have multiple elseif clauses. Note that "
"the expression in the else and endif clause is optional. Long "
"expressions can be used and there is a traditional order of "
"precedence. "
"Parenthetical expressions are evaluated first followed by unary "
"operators such as EXISTS, COMMAND, and DEFINED. "
"Then any EQUAL, LESS, GREATER, STRLESS, STRGREATER, STREQUAL, MATCHES "
"will be evaluated. Then NOT operators and finally AND, OR operators "
"will be evaluated. Possible expressions are:\n"
" if(variable)\n"
"True if the variable's value is not empty, 0, N, NO, OFF, FALSE, "
"NOTFOUND, or <variable>-NOTFOUND.\n"
" if(NOT variable)\n"
"True if the variable's value is empty, 0, N, NO, OFF, FALSE, "
"NOTFOUND, or <variable>-NOTFOUND.\n"
" if(variable1 AND variable2)\n"
"True if both variables would be considered true individually.\n"
" if(variable1 OR variable2)\n"
"True if either variable would be considered true individually.\n"
" if(COMMAND command-name)\n"
"True if the given name is a command, macro or function that can be "
"invoked.\n"
" if(POLICY policy-id)\n"
"True if the given name is an existing policy "
"(of the form CMP<NNNN>).\n"
" if(TARGET target-name)\n"
"True if the given name is an existing target, built or imported.\n"
" if(EXISTS file-name)\n"
" if(EXISTS directory-name)\n"
"True if the named file or directory exists. "
"Behavior is well-defined only for full paths.\n"
" if(file1 IS_NEWER_THAN file2)\n"
"True if file1 is newer than file2 or if one of the two files "
"doesn't exist. "
"Behavior is well-defined only for full paths.\n"
" if(IS_DIRECTORY directory-name)\n"
"True if the given name is a directory. "
"Behavior is well-defined only for full paths.\n"
" if(IS_ABSOLUTE path)\n"
"True if the given path is an absolute path.\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"
" if(variable EQUAL number)\n"
" if(string EQUAL number)\n"
"True if the given string or variable's value is a valid number and "
"the inequality or equality is true.\n"
" if(variable STRLESS string)\n"
" if(string STRLESS string)\n"
" if(variable STRGREATER string)\n"
" if(string STRGREATER string)\n"
" if(variable STREQUAL string)\n"
" if(string STREQUAL string)\n"
"True if the given string or variable's value is lexicographically "
"less (or greater, or equal) than the string on the right.\n"
" if(version1 VERSION_LESS version2)\n"
" if(version1 VERSION_EQUAL version2)\n"
" if(version1 VERSION_GREATER version2)\n"
"Component-wise integer version number comparison (version format is "
"major[.minor[.patch[.tweak]]]).\n"
" if(DEFINED variable)\n"
"True if the given variable is defined. It does not matter if the "
"variable is true or false just if it has been set.\n"
" if((expression) AND (expression OR (expression)))\n"
"The expressions inside the parenthesis are evaluated first and "
"then the remaining expression is evaluated as in the previous "
"examples. Where there are nested parenthesis the innermost are "
"evaluated as part of evaluating the expression "
"that contains them."
;
}
// this is a shared function for both If and Else to determine if the
// arguments were valid, and if so, was the response true. If there is
// an error, the errorString will be set.
static bool IsTrue(const std::vector<std::string> &args,
std::string &errorString, cmMakefile *mf);
// 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);
static const char* GetVariableOrNumber(const char* str,
const cmMakefile* mf);
cmTypeMacro(cmIfCommand, cmCommand);
};
#endif
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