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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 "cmStandardIncludes.h"
#include <stack>
#include <cmsys/RegularExpression.hxx>
class cmMakefile;
class cmListFileBacktrace;
/** \class cmGeneratorExpression
* \brief Evaluate generate-time query expression syntax.
*
* cmGeneratorExpression instances are used by build system generator
* implementations to evaluate the $<> generator expression syntax.
* Generator expressions are evaluated just before the generate step
* writes strings into the build system. They have knowledge of the
* build configuration which is not available at configure time.
*/
class cmGeneratorExpression
{
public:
/** Construct with an evaluation context and configuration. */
cmGeneratorExpression(cmMakefile* mf, const char* config,
cmListFileBacktrace const& backtrace);
/** Evaluate generator expressions in a string. */
const char* Process(std::string const& input);
const char* Process(const char* input);
private:
cmMakefile* Makefile;
const char* Config;
cmListFileBacktrace const& Backtrace;
std::vector<char> Data;
std::stack<size_t> Barriers;
cmsys::RegularExpression TargetInfo;
bool Evaluate();
bool Evaluate(const char* expr, std::string& result);
bool EvaluateTargetInfo(std::string& result);
};
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