285 lines
11 KiB
C++
285 lines
11 KiB
C++
/*============================================================================
|
|
CMake - Cross Platform Makefile Generator
|
|
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
|
|
|
|
Distributed under the OSI-approved BSD License (the "License");
|
|
see accompanying file Copyright.txt for details.
|
|
|
|
This software is distributed WITHOUT ANY WARRANTY; without even the
|
|
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
See the License 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(<constant>)\n"
|
|
"True if the constant is 1, ON, YES, TRUE, Y, or a non-zero number. "
|
|
"False if the constant is 0, OFF, NO, FALSE, N, IGNORE, \"\", "
|
|
"or ends in the suffix '-NOTFOUND'. "
|
|
"Named boolean constants are case-insensitive."
|
|
"\n"
|
|
" if(<variable>)\n"
|
|
"True if the variable's value is not a false constant."
|
|
"\n"
|
|
" if(NOT <expression>)\n"
|
|
"True if the expression is not true."
|
|
"\n"
|
|
" if(<expr1> AND <expr2>)\n"
|
|
"True if both expressions would be considered true individually."
|
|
"\n"
|
|
" if(<expr1> OR <expr2>)\n"
|
|
"True if either expression 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_SYMLINK file-name)\n"
|
|
"True if the given name is a symbolic link. "
|
|
"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 or variable 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."
|
|
"\n"
|
|
|
|
"The if statement was written fairly early in CMake's history "
|
|
"and it has some convenience features that are worth covering. "
|
|
"The if statement reduces operations until there is "
|
|
"a single remaining value, at that point if the case "
|
|
"insensitive value is: ON, 1, YES, TRUE, Y it returns true, if "
|
|
"it is OFF, 0, NO, FALSE, N, NOTFOUND, *-NOTFOUND, IGNORE it "
|
|
"will return false. \n"
|
|
|
|
"This is fairly reasonable. The convenience feature that sometimes "
|
|
"throws new authors is how CMake handles values that do not "
|
|
"match the true or false list. Those values are treated as "
|
|
"variables and are dereferenced even though they do not have "
|
|
"the required ${} syntax. This means that if you write\n"
|
|
|
|
" if (boobah)\n"
|
|
|
|
"CMake will treat it as if you wrote \n"
|
|
|
|
" if (${boobah})\n"
|
|
|
|
"likewise if you write \n"
|
|
|
|
" if (fubar AND sol)\n"
|
|
|
|
"CMake will conveniently treat it as \n"
|
|
|
|
" if (\"${fubar}\" AND \"${sol}\")\n"
|
|
|
|
"The later is really the correct way to write it, but the "
|
|
"former will work as well. Only some operations in the if "
|
|
"statement have this special handling of arguments. The "
|
|
"specific details follow: \n"
|
|
|
|
"1) The left hand argument to MATCHES is first checked to see "
|
|
"if it is a defined variable, if so the variable's value is "
|
|
"used, otherwise the original value is used. \n"
|
|
|
|
"2) If the left hand argument to MATCHES is missing it returns "
|
|
"false without error \n"
|
|
|
|
"3) Both left and right hand arguments to LESS GREATER EQUAL "
|
|
"are independently tested to see if they are defined variables, "
|
|
"if so their defined values are used otherwise the original "
|
|
"value is used. \n"
|
|
|
|
"4) Both left and right hand arguments to STRLESS STREQUAL "
|
|
"STRGREATER are independently tested to see if they are defined "
|
|
"variables, if so their defined values are used otherwise the "
|
|
"original value is used. \n"
|
|
|
|
"5) Both left and right hand argumemnts to VERSION_LESS "
|
|
"VERSION_EQUAL VERSION_GREATER are independently tested to see "
|
|
"if they are defined variables, if so their defined values are "
|
|
"used otherwise the original value is used. \n"
|
|
|
|
"6) The right hand argument to NOT is tested to see if it is a "
|
|
"boolean constant, if so the value is used, otherwise it is "
|
|
"assumed to be a variable and it is dereferenced. \n"
|
|
|
|
"7) The left and right hand arguments to AND OR are "
|
|
"independently tested to see if they are boolean constants, if "
|
|
"so they are used as such, otherwise they are assumed to be "
|
|
"variables and are dereferenced. \n"
|
|
;
|
|
}
|
|
|
|
// 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,
|
|
cmake::MessageType &status);
|
|
|
|
// 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);
|
|
|
|
cmTypeMacro(cmIfCommand, cmCommand);
|
|
};
|
|
|
|
|
|
#endif
|