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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 cmDefinitions_h
#define cmDefinitions_h
#include "cmStandardIncludes.h"
#if defined(CMAKE_BUILD_WITH_CMAKE)
#include "cmsys/hash_map.hxx"
#endif
/** \class cmDefinitions
* \brief Store a scope of variable definitions for CMake language.
*
* This stores the state of variable definitions (set or unset) for
* one scope. Sets are always local. Gets search parent scopes
* transitively and save results locally.
*/
class cmDefinitions
{
public:
/** Construct with the given parent scope. */
cmDefinitions(cmDefinitions* parent = 0);
/** Reset object as if newly constructed. */
void Reset(cmDefinitions* parent = 0);
/** Returns the parent scope, if any. */
cmDefinitions* GetParent() const { return this->Up; }
/** Get the value associated with a key; null if none.
Store the result locally if it came from a parent. */
const char* Get(const std::string& key);
/** Set (or unset if null) a value associated with a key. */
const char* Set(const std::string& key, const char* value);
/** Get the set of all local keys. */
std::set<std::string> LocalKeys() const;
/** Compute the closure of all defined keys with values.
This flattens the scope. The result has no parent. */
cmDefinitions Closure() const;
/** Compute the set of all defined keys. */
std::set<std::string> ClosureKeys() const;
private:
// String with existence boolean.
struct Def: public std::string
{
private:
typedef std::string std_string;
public:
Def(): std_string(), Exists(false) {}
Def(const char* v): std_string(v?v:""), Exists(v?true:false) {}
Def(const std_string& v): std_string(v), Exists(true) {}
Def(Def const& d): std_string(d), Exists(d.Exists) {}
bool Exists;
};
static Def NoDef;
// Parent scope, if any.
cmDefinitions* Up;
// Local definitions, set or unset.
#if defined(CMAKE_BUILD_WITH_CMAKE)
typedef cmsys::hash_map<std::string, Def> MapType;
#else
typedef std::map<std::string, Def> MapType;
#endif
MapType Map;
// Internal query and update methods.
Def const& GetInternal(const std::string& key);
Def const& SetInternal(const std::string& key, Def const& def);
// Implementation of Closure() method.
struct ClosureTag {};
cmDefinitions(ClosureTag const&, cmDefinitions const* root);
void ClosureImpl(std::set<std::string>& undefined,
cmDefinitions const* defs);
// Implementation of ClosureKeys() method.
void ClosureKeys(std::set<std::string>& defined,
std::set<std::string>& undefined) const;
};
#endif
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