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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmGeneratorExpression_h
#define cmGeneratorExpression_h
#include "cmConfigure.h" // IWYU pragma: keep
#include "cmListFileCache.h"
#include <map>
#include <memory> // IWYU pragma: keep
#include <set>
#include <string>
#include <utility>
#include <vector>
class cmCompiledGeneratorExpression;
class cmGeneratorTarget;
class cmLocalGenerator;
struct cmGeneratorExpressionContext;
struct cmGeneratorExpressionDAGChecker;
struct cmGeneratorExpressionEvaluator;
/** \class cmGeneratorExpression
* \brief Evaluate generate-time query expression syntax.
*
* cmGeneratorExpression instances are used by build system generator
* implementations to evaluate the $<> generator expression syntax.
* Generator expressions are evaluated just before the generate step
* writes strings into the build system. They have knowledge of the
* build configuration which is not available at configure time.
*/
class cmGeneratorExpression
{
CM_DISABLE_COPY(cmGeneratorExpression)
public:
/** Construct. */
cmGeneratorExpression(cmListFileBacktrace backtrace = cmListFileBacktrace());
~cmGeneratorExpression();
std::unique_ptr<cmCompiledGeneratorExpression> Parse(
std::string const& input);
std::unique_ptr<cmCompiledGeneratorExpression> Parse(const char* input);
enum PreprocessContext
{
StripAllGeneratorExpressions,
BuildInterface,
InstallInterface
};
static std::string Preprocess(const std::string& input,
PreprocessContext context,
bool resolveRelative = false);
static void Split(const std::string& input,
std::vector<std::string>& output);
static std::string::size_type Find(const std::string& input);
static bool IsValidTargetName(const std::string& input);
static std::string StripEmptyListElements(const std::string& input);
static inline bool StartsWithGeneratorExpression(const std::string& input)
{
return input.length() >= 2 && input[0] == '$' && input[1] == '<';
}
static inline bool StartsWithGeneratorExpression(const char* input)
{
return input != nullptr && input[0] == '$' && input[1] == '<';
}
private:
cmListFileBacktrace Backtrace;
};
class cmCompiledGeneratorExpression
{
CM_DISABLE_COPY(cmCompiledGeneratorExpression)
public:
const std::string& Evaluate(
cmLocalGenerator* lg, const std::string& config, bool quiet = false,
cmGeneratorTarget const* headTarget = nullptr,
cmGeneratorTarget const* currentTarget = nullptr,
cmGeneratorExpressionDAGChecker* dagChecker = nullptr,
std::string const& language = std::string()) const;
const std::string& Evaluate(
cmLocalGenerator* lg, const std::string& config, bool quiet,
cmGeneratorTarget const* headTarget,
cmGeneratorExpressionDAGChecker* dagChecker,
std::string const& language = std::string()) const;
/** Get set of targets found during evaluations. */
std::set<cmGeneratorTarget*> const& GetTargets() const
{
return this->DependTargets;
}
std::set<std::string> const& GetSeenTargetProperties() const
{
return this->SeenTargetProperties;
}
std::set<cmGeneratorTarget const*> const& GetAllTargetsSeen() const
{
return this->AllTargetsSeen;
}
~cmCompiledGeneratorExpression();
std::string const& GetInput() const { return this->Input; }
cmListFileBacktrace GetBacktrace() const { return this->Backtrace; }
bool GetHadContextSensitiveCondition() const
{
return this->HadContextSensitiveCondition;
}
bool GetHadHeadSensitiveCondition() const
{
return this->HadHeadSensitiveCondition;
}
std::set<cmGeneratorTarget const*> GetSourceSensitiveTargets() const
{
return this->SourceSensitiveTargets;
}
void SetEvaluateForBuildsystem(bool eval)
{
this->EvaluateForBuildsystem = eval;
}
void GetMaxLanguageStandard(cmGeneratorTarget const* tgt,
std::map<std::string, std::string>& mapping);
private:
const std::string& EvaluateWithContext(
cmGeneratorExpressionContext& context,
cmGeneratorExpressionDAGChecker* dagChecker) const;
cmCompiledGeneratorExpression(cmListFileBacktrace backtrace,
std::string input);
friend class cmGeneratorExpression;
cmListFileBacktrace Backtrace;
std::vector<cmGeneratorExpressionEvaluator*> Evaluators;
const std::string Input;
bool NeedsEvaluation;
mutable std::set<cmGeneratorTarget*> DependTargets;
mutable std::set<cmGeneratorTarget const*> AllTargetsSeen;
mutable std::set<std::string> SeenTargetProperties;
mutable std::map<cmGeneratorTarget const*,
std::map<std::string, std::string>>
MaxLanguageStandard;
mutable std::string Output;
mutable bool HadContextSensitiveCondition;
mutable bool HadHeadSensitiveCondition;
mutable std::set<cmGeneratorTarget const*> SourceSensitiveTargets;
bool EvaluateForBuildsystem;
};
class cmGeneratorExpressionInterpreter
{
CM_DISABLE_COPY(cmGeneratorExpressionInterpreter)
public:
cmGeneratorExpressionInterpreter(cmLocalGenerator* localGenerator,
std::string config,
cmGeneratorTarget const* headTarget,
std::string lang = std::string())
: LocalGenerator(localGenerator)
, Config(std::move(config))
, HeadTarget(headTarget)
, Language(std::move(lang))
{
}
const std::string& Evaluate(const char* expression,
const std::string& property);
const std::string& Evaluate(const std::string& expression,
const std::string& property)
{
return this->Evaluate(expression.c_str(), property);
}
protected:
cmGeneratorExpression GeneratorExpression;
std::unique_ptr<cmCompiledGeneratorExpression> CompiledGeneratorExpression;
cmLocalGenerator* LocalGenerator = nullptr;
std::string Config;
cmGeneratorTarget const* HeadTarget = nullptr;
std::string Language;
};
#endif
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