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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.
============================================================================*/
#ifndef cmGeneratorExpression_h
#define cmGeneratorExpression_h
#include "cmStandardIncludes.h"
#include <stack>
#include <cmsys/RegularExpression.hxx>
class cmTarget;
class cmGeneratorTarget;
class cmMakefile;
class cmListFileBacktrace;
struct cmGeneratorExpressionEvaluator;
struct cmGeneratorExpressionDAGChecker;
class cmCompiledGeneratorExpression;
/** \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. */
cmGeneratorExpression(cmListFileBacktrace const& backtrace);
~cmGeneratorExpression();
const cmCompiledGeneratorExpression& Parse(std::string const& input);
const cmCompiledGeneratorExpression& Parse(const char* input);
enum PreprocessContext {
StripAllGeneratorExpressions
};
static std::string Preprocess(const std::string &input,
PreprocessContext context);
private:
cmGeneratorExpression(const cmGeneratorExpression &);
void operator=(const cmGeneratorExpression &);
cmListFileBacktrace const& Backtrace;
cmCompiledGeneratorExpression *CompiledExpression;
};
class cmCompiledGeneratorExpression
{
public:
const char* Evaluate(cmMakefile* mf, const char* config,
bool quiet = false,
cmGeneratorTarget *target = 0,
cmGeneratorExpressionDAGChecker *dagChecker = 0) const;
/** Get set of targets found during evaluations. */
std::set<cmTarget*> const& GetTargets() const
{ return this->Targets; }
~cmCompiledGeneratorExpression();
private:
cmCompiledGeneratorExpression(cmListFileBacktrace const& backtrace,
const std::vector<cmGeneratorExpressionEvaluator*> &evaluators,
const char *input, bool needsParsing);
friend class cmGeneratorExpression;
cmCompiledGeneratorExpression(const cmCompiledGeneratorExpression &);
void operator=(const cmCompiledGeneratorExpression &);
cmListFileBacktrace const& Backtrace;
const std::vector<cmGeneratorExpressionEvaluator*> Evaluators;
const char* const Input;
const bool NeedsParsing;
mutable std::set<cmTarget*> Targets;
mutable std::string Output;
};
#endif
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