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CMake/Source/cmIfCommand.cxx
Brad King a6a673979d ENH: Add "if(POLICY policy-id)" option for IF command. 
- This will help projects support multiple CMake versions.
  - In order to set a policy when using a newer CMake but still
    working with an older CMake one may write
      if(POLICY CMP1234)
        cmake_policy(SET CMP1234 NEW)
      endif(POLICY CMP1234)
  - Note that since CMake 2.4 does not have if(POLICY) supporting
    it will also require using "if(COMMAND cmake_policy)"
2008-03-20 18:25:59 -04:00

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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.
=========================================================================*/
#include "cmIfCommand.h"
#include "cmStringCommand.h"
#include <stdlib.h> // required for atof
#include <list>
#include <cmsys/RegularExpression.hxx>
bool cmIfFunctionBlocker::
IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile &mf,
cmExecutionStatus &inStatus)
{
// Prevent recusion and don't let this blocker block its own
// commands.
if (this->Executing)
{
return false;
}
// we start by recording all the functions
if (!cmSystemTools::Strucmp(lff.Name.c_str(),"if"))
{
this->ScopeDepth++;
}
if (!cmSystemTools::Strucmp(lff.Name.c_str(),"endif"))
{
this->ScopeDepth--;
// if this is the endif for this if statement, then start executing
if (!this->ScopeDepth)
{
// execute the functions for the true parts of the if statement
this->Executing = true;
cmExecutionStatus status;
int scopeDepth = 0;
for(unsigned int c = 0; c < this->Functions.size(); ++c)
{
// keep track of scope depth
if (!cmSystemTools::Strucmp(this->Functions[c].Name.c_str(),"if"))
{
scopeDepth++;
}
if (!cmSystemTools::Strucmp(this->Functions[c].Name.c_str(),"endif"))
{
scopeDepth--;
}
// watch for our state change
if (scopeDepth == 0 &&
!cmSystemTools::Strucmp(this->Functions[c].Name.c_str(),"else"))
{
this->IsBlocking = this->HasRun;
this->HasRun = true;
}
else if (scopeDepth == 0 && !cmSystemTools::Strucmp
(this->Functions[c].Name.c_str(),"elseif"))
{
if (this->HasRun)
{
this->IsBlocking = true;
}
else
{
char* errorString = 0;
std::vector<std::string> expandedArguments;
mf.ExpandArguments(this->Functions[c].Arguments,
expandedArguments);
bool isTrue =
cmIfCommand::IsTrue(expandedArguments,&errorString,&mf);
if (errorString)
{
std::string err = "had incorrect arguments: ";
unsigned int i;
for(i =0; i < this->Functions[c].Arguments.size(); ++i)
{
err += (this->Functions[c].Arguments[i].Quoted?"\"":"");
err += this->Functions[c].Arguments[i].Value;
err += (this->Functions[c].Arguments[i].Quoted?"\"":"");
err += " ";
}
err += "(";
err += errorString;
err += ").";
cmSystemTools::Error(err.c_str());
delete [] errorString;
return false;
}
if (isTrue)
{
this->IsBlocking = false;
this->HasRun = true;
}
}
}
// should we execute?
else if (!this->IsBlocking)
{
status.Clear();
mf.ExecuteCommand(this->Functions[c],status);
if (status.GetReturnInvoked())
{
inStatus.SetReturnInvoked(true);
mf.RemoveFunctionBlocker(lff);
return true;
}
if (status.GetBreakInvoked())
{
inStatus.SetBreakInvoked(true);
mf.RemoveFunctionBlocker(lff);
return true;
}
}
}
mf.RemoveFunctionBlocker(lff);
return true;
}
}
// record the command
this->Functions.push_back(lff);
// always return true
return true;
}
bool cmIfFunctionBlocker::ShouldRemove(const cmListFileFunction& lff,
cmMakefile&)
{
if (!cmSystemTools::Strucmp(lff.Name.c_str(),"endif"))
{
// if the endif has arguments, then make sure
// they match the arguments of the matching if
if (lff.Arguments.size() == 0 ||
lff.Arguments == this->Args)
{
return true;
}
}
return false;
}
void cmIfFunctionBlocker::
ScopeEnded(cmMakefile &mf)
{
std::string errmsg = "The end of a CMakeLists file was reached with an "
"IF statement that was not closed properly.\nWithin the directory: ";
errmsg += mf.GetCurrentDirectory();
errmsg += "\nThe arguments are: ";
for(std::vector<cmListFileArgument>::const_iterator j = this->Args.begin();
j != this->Args.end(); ++j)
{
errmsg += (j->Quoted?"\"":"");
errmsg += j->Value;
errmsg += (j->Quoted?"\"":"");
errmsg += " ";
}
cmSystemTools::Message(errmsg.c_str(), "Warning");
}
bool cmIfCommand
::InvokeInitialPass(const std::vector<cmListFileArgument>& args,
cmExecutionStatus &)
{
char* errorString = 0;
std::vector<std::string> expandedArguments;
this->Makefile->ExpandArguments(args, expandedArguments);
bool isTrue =
cmIfCommand::IsTrue(expandedArguments,&errorString,this->Makefile);
if (errorString)
{
std::string err = "had incorrect arguments: ";
unsigned int i;
for(i =0; i < args.size(); ++i)
{
err += (args[i].Quoted?"\"":"");
err += args[i].Value;
err += (args[i].Quoted?"\"":"");
err += " ";
}
err += "(";
err += errorString;
err += ").";
this->SetError(err.c_str());
delete [] errorString;
return false;
}
cmIfFunctionBlocker *f = new cmIfFunctionBlocker();
// if is isn't true block the commands
f->ScopeDepth = 1;
f->IsBlocking = !isTrue;
if (isTrue)
{
f->HasRun = true;
}
f->Args = args;
this->Makefile->AddFunctionBlocker(f);
return true;
}
namespace
{
void IncrementArguments(std::list<std::string> &newArgs,
std::list<std::string>::iterator &argP1,
std::list<std::string>::iterator &argP2)
{
if (argP1 != newArgs.end())
{
argP1++;
argP2 = argP1;
if (argP1 != newArgs.end())
{
argP2++;
}
}
}
}
// order of operations,
// IS_DIRECTORY EXISTS COMMAND DEFINED
// MATCHES LESS GREATER EQUAL STRLESS STRGREATER STREQUAL
// AND OR
//
// There is an issue on whether the arguments should be values of references,
// for example IF (FOO AND BAR) should that compare the strings FOO and BAR
// or should it really do IF (${FOO} AND ${BAR}) Currently IS_DIRECTORY
// EXISTS COMMAND and DEFINED all take values. EQUAL, LESS and GREATER can
// take numeric values or variable names. STRLESS and STRGREATER take
// variable names but if the variable name is not found it will use the name
// directly. AND OR take variables or the values 0 or 1.
bool cmIfCommand::IsTrue(const std::vector<std::string> &args,
char **errorString, cmMakefile *makefile)
{
// check for the different signatures
const char *def;
const char *def2;
const char* msg = "Unknown arguments specified";
*errorString = new char[strlen(msg) + 1];
strcpy(*errorString, msg);
// handle empty invocation
if (args.size() < 1)
{
delete [] *errorString;
*errorString = 0;
return false;
}
// store the reduced args in this vector
std::list<std::string> newArgs;
int reducible;
unsigned int i;
// copy to the list structure
for(i = 0; i < args.size(); ++i)
{
newArgs.push_back(args[i]);
}
std::list<std::string>::iterator argP1;
std::list<std::string>::iterator argP2;
// now loop through the arguments and see if we can reduce any of them
// we do this multiple times. Once for each level of precedence
do
{
reducible = 0;
std::list<std::string>::iterator arg = newArgs.begin();
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
// does a file exist
if (*arg == "EXISTS" && argP1 != newArgs.end())
{
if(cmSystemTools::FileExists((argP1)->c_str()))
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// does a directory with this name exist
if (*arg == "IS_DIRECTORY" && argP1 != newArgs.end())
{
if(cmSystemTools::FileIsDirectory((argP1)->c_str()))
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// is the given path an absolute path ?
if (*arg == "IS_ABSOLUTE" && argP1 != newArgs.end())
{
if(cmSystemTools::FileIsFullPath((argP1)->c_str()))
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// does a command exist
if (*arg == "COMMAND" && argP1 != newArgs.end())
{
if(makefile->CommandExists((argP1)->c_str()))
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// does a policy exist
if (*arg == "POLICY" && argP1 != newArgs.end())
{
cmPolicies::PolicyID pid;
if(makefile->GetPolicies()->GetPolicyID((argP1)->c_str(), pid))
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// is a variable defined
if (*arg == "DEFINED" && argP1 != newArgs.end())
{
size_t argP1len = argP1->size();
bool bdef = false;
if(argP1len > 4 && argP1->substr(0, 4) == "ENV{" &&
argP1->operator[](argP1len-1) == '}')
{
std::string env = argP1->substr(4, argP1len-5);
bdef = cmSystemTools::GetEnv(env.c_str())?true:false;
}
else
{
bdef = makefile->IsDefinitionSet((argP1)->c_str());
}
if(bdef)
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
++arg;
}
}
while (reducible);
// now loop through the arguments and see if we can reduce any of them
// we do this multiple times. Once for each level of precedence
do
{
reducible = 0;
std::list<std::string>::iterator arg = newArgs.begin();
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
*(argP1) == "MATCHES")
{
def = cmIfCommand::GetVariableOrString(arg->c_str(), makefile);
const char* rex = (argP2)->c_str();
cmStringCommand::ClearMatches(makefile);
cmsys::RegularExpression regEntry;
if ( !regEntry.compile(rex) )
{
cmOStringStream error;
error << "Regular expression \"" << rex << "\" cannot compile";
delete [] *errorString;
*errorString = new char[error.str().size() + 1];
strcpy(*errorString, error.str().c_str());
return false;
}
if (regEntry.find(def))
{
cmStringCommand::StoreMatches(makefile, regEntry);
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && *arg == "MATCHES")
{
*arg = "0";
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
(*(argP1) == "LESS" || *(argP1) == "GREATER" ||
*(argP1) == "EQUAL"))
{
def = cmIfCommand::GetVariableOrString(arg->c_str(), makefile);
def2 = cmIfCommand::GetVariableOrString((argP2)->c_str(), makefile);
double lhs;
double rhs;
if(sscanf(def, "%lg", &lhs) != 1 ||
sscanf(def2, "%lg", &rhs) != 1)
{
*arg = "0";
}
else if (*(argP1) == "LESS")
{
if(lhs < rhs)
{
*arg = "1";
}
else
{
*arg = "0";
}
}
else if (*(argP1) == "GREATER")
{
if(lhs > rhs)
{
*arg = "1";
}
else
{
*arg = "0";
}
}
else
{
if(lhs == rhs)
{
*arg = "1";
}
else
{
*arg = "0";
}
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
(*(argP1) == "STRLESS" ||
*(argP1) == "STREQUAL" ||
*(argP1) == "STRGREATER"))
{
def = cmIfCommand::GetVariableOrString(arg->c_str(), makefile);
def2 = cmIfCommand::GetVariableOrString((argP2)->c_str(), makefile);
int val = strcmp(def,def2);
int result;
if (*(argP1) == "STRLESS")
{
result = (val < 0);
}
else if (*(argP1) == "STRGREATER")
{
result = (val > 0);
}
else // strequal
{
result = (val == 0);
}
if(result)
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
// is file A newer than file B
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
*(argP1) == "IS_NEWER_THAN")
{
int fileIsNewer=0;
bool success=cmSystemTools::FileTimeCompare(arg->c_str(),
(argP2)->c_str(),
&fileIsNewer);
if(success==false || fileIsNewer==1 || fileIsNewer==0)
{
*arg = "1";
}
else
{
*arg = "0";
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
++arg;
}
}
while (reducible);
// now loop through the arguments and see if we can reduce any of them
// we do this multiple times. Once for each level of precedence
do
{
reducible = 0;
std::list<std::string>::iterator arg = newArgs.begin();
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && *arg == "NOT")
{
def = cmIfCommand::GetVariableOrNumber((argP1)->c_str(), makefile);
if(!cmSystemTools::IsOff(def))
{
*arg = "0";
}
else
{
*arg = "1";
}
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
++arg;
}
}
while (reducible);
// now loop through the arguments and see if we can reduce any of them
// we do this multiple times. Once for each level of precedence
do
{
reducible = 0;
std::list<std::string>::iterator arg = newArgs.begin();
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && *(argP1) == "AND" &&
argP2 != newArgs.end())
{
def = cmIfCommand::GetVariableOrNumber(arg->c_str(), makefile);
def2 = cmIfCommand::GetVariableOrNumber((argP2)->c_str(), makefile);
if(cmSystemTools::IsOff(def) || cmSystemTools::IsOff(def2))
{
*arg = "0";
}
else
{
*arg = "1";
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && *(argP1) == "OR" &&
argP2 != newArgs.end())
{
def = cmIfCommand::GetVariableOrNumber(arg->c_str(), makefile);
def2 = cmIfCommand::GetVariableOrNumber((argP2)->c_str(), makefile);
if(cmSystemTools::IsOff(def) && cmSystemTools::IsOff(def2))
{
*arg = "0";
}
else
{
*arg = "1";
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
++arg;
}
}
while (reducible);
// now at the end there should only be one argument left
if (newArgs.size() == 1)
{
delete [] *errorString;
*errorString = 0;
if (*newArgs.begin() == "0")
{
return false;
}
if (*newArgs.begin() == "1")
{
return true;
}
def = makefile->GetDefinition(args[0].c_str());
if(cmSystemTools::IsOff(def))
{
return false;
}
}
return true;
}
const char* cmIfCommand::GetVariableOrString(const char* str,
const cmMakefile* mf)
{
const char* def = mf->GetDefinition(str);
if(!def)
{
def = str;
}
return def;
}
const char* cmIfCommand::GetVariableOrNumber(const char* str,
const cmMakefile* mf)
{
const char* def = mf->GetDefinition(str);
if(!def)
{
if (atoi(str))
{
def = str;
}
}
return def;
}
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