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/*============================================================================
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.
============================================================================*/
#include "cmGeneratorExpression.h"
#include "cmMakefile.h"
#include "cmTarget.h"
#include "assert.h"
#include <cmsys/String.h>
#include "cmGeneratorExpressionEvaluator.h"
#include "cmGeneratorExpressionLexer.h"
#include "cmGeneratorExpressionParser.h"
#include "cmGeneratorExpressionDAGChecker.h"
//----------------------------------------------------------------------------
cmGeneratorExpression::cmGeneratorExpression(
cmListFileBacktrace const& backtrace):
Backtrace(backtrace), CompiledExpression(0)
{
}
//----------------------------------------------------------------------------
const cmCompiledGeneratorExpression &
cmGeneratorExpression::Parse(std::string const& input)
{
return this->Parse(input.c_str());
}
//----------------------------------------------------------------------------
const cmCompiledGeneratorExpression &
cmGeneratorExpression::Parse(const char* input)
{
cmGeneratorExpressionLexer l;
std::vector<cmGeneratorExpressionToken> tokens = l.Tokenize(input);
bool needsParsing = l.GetSawGeneratorExpression();
std::vector<cmGeneratorExpressionEvaluator*> evaluators;
if (needsParsing)
{
cmGeneratorExpressionParser p(tokens);
p.Parse(evaluators);
}
delete this->CompiledExpression;
this->CompiledExpression = new cmCompiledGeneratorExpression(
this->Backtrace,
evaluators,
input,
needsParsing);
return *this->CompiledExpression;
}
cmGeneratorExpression::~cmGeneratorExpression()
{
delete this->CompiledExpression;
}
//----------------------------------------------------------------------------
const char *cmCompiledGeneratorExpression::Evaluate(
cmMakefile* mf, const char* config, bool quiet,
cmGeneratorTarget *target,
cmGeneratorExpressionDAGChecker *dagChecker) const
{
if (!this->NeedsParsing)
{
return this->Input;
}
this->Output = "";
std::vector<cmGeneratorExpressionEvaluator*>::const_iterator it
= this->Evaluators.begin();
const std::vector<cmGeneratorExpressionEvaluator*>::const_iterator end
= this->Evaluators.end();
cmGeneratorExpressionContext context;
context.Makefile = mf;
context.Config = config;
context.Quiet = quiet;
context.HadError = false;
context.Target = target;
context.Backtrace = this->Backtrace;
for ( ; it != end; ++it)
{
this->Output += (*it)->Evaluate(&context, dagChecker);
if (context.HadError)
{
this->Output = "";
break;
}
}
this->Targets = context.Targets;
// TODO: Return a std::string from here instead?
return this->Output.c_str();
}
cmCompiledGeneratorExpression::cmCompiledGeneratorExpression(
cmListFileBacktrace const& backtrace,
const std::vector<cmGeneratorExpressionEvaluator*> &evaluators,
const char *input, bool needsParsing)
: Backtrace(backtrace), Evaluators(evaluators), Input(input),
NeedsParsing(needsParsing)
{
}
//----------------------------------------------------------------------------
cmCompiledGeneratorExpression::~cmCompiledGeneratorExpression()
{
std::vector<cmGeneratorExpressionEvaluator*>::const_iterator it
= this->Evaluators.begin();
const std::vector<cmGeneratorExpressionEvaluator*>::const_iterator end
= this->Evaluators.end();
for ( ; it != end; ++it)
{
delete *it;
}
}
std::string cmGeneratorExpression::Preprocess(const std::string &input,
PreprocessContext context)
{
if (context != StripAllGeneratorExpressions)
{
assert(!"cmGeneratorExpression::Preprocess called with invalid args");
return std::string();
}
std::string result;
std::string::size_type pos = 0;
std::string::size_type lastPos = pos;
while((pos = input.find("$<", lastPos)) != input.npos)
{
result += input.substr(lastPos, pos - lastPos);
pos += 2;
int nestingLevel = 1;
const char *c = input.c_str() + pos;
const char * const cStart = c;
for ( ; *c; ++c)
{
if(c[0] == '$' && c[1] == '<')
{
++nestingLevel;
++c;
continue;
}
if(c[0] == '>')
{
--nestingLevel;
if (nestingLevel == 0)
{
break;
}
}
}
const std::string::size_type traversed = (c - cStart) + 1;
if (!*c)
{
result += "$<" + input.substr(pos, traversed);
}
pos += traversed;
lastPos = pos;
}
result += input.substr(lastPos);
return result;
}
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