98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#ifndef cmDefinitions_h
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#define cmDefinitions_h
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#include "cmStandardIncludes.h"
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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#include "cmsys/hash_map.hxx"
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#endif
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/** \class cmDefinitions
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* \brief Store a scope of variable definitions for CMake language.
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*
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* This stores the state of variable definitions (set or unset) for
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* one scope. Sets are always local. Gets search parent scopes
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* transitively and save results locally.
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*/
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class cmDefinitions
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{
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public:
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/** Construct with the given parent scope. */
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cmDefinitions(cmDefinitions* parent = 0);
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/** Reset object as if newly constructed. */
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void Reset(cmDefinitions* parent = 0);
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/** Returns the parent scope, if any. */
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cmDefinitions* GetParent() const { return this->Up; }
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/** Get the value associated with a key; null if none.
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Store the result locally if it came from a parent. */
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const char* Get(const std::string& key);
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/** Set (or unset if null) a value associated with a key. */
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const char* Set(const std::string& key, const char* value);
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/** Get the set of all local keys. */
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std::set<std::string> LocalKeys() const;
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/** Compute the closure of all defined keys with values.
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This flattens the scope. The result has no parent. */
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cmDefinitions Closure() const;
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/** Compute the set of all defined keys. */
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std::set<std::string> ClosureKeys() const;
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private:
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// String with existence boolean.
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struct Def: public std::string
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{
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private:
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typedef std::string std_string;
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public:
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Def(): std_string(), Exists(false) {}
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Def(const char* v): std_string(v?v:""), Exists(v?true:false) {}
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Def(const std_string& v): std_string(v), Exists(true) {}
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Def(Def const& d): std_string(d), Exists(d.Exists) {}
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bool Exists;
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};
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static Def NoDef;
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// Parent scope, if any.
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cmDefinitions* Up;
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// Local definitions, set or unset.
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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typedef cmsys::hash_map<std::string, Def> MapType;
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#else
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typedef std::map<std::string, Def> MapType;
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#endif
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MapType Map;
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// Internal query and update methods.
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Def const& GetInternal(const std::string& key);
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Def const& SetInternal(const std::string& key, Def const& def);
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// Implementation of Closure() method.
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struct ClosureTag {};
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cmDefinitions(ClosureTag const&, cmDefinitions const* root);
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void ClosureImpl(std::set<std::string>& undefined,
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cmDefinitions const* defs);
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// Implementation of ClosureKeys() method.
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void ClosureKeys(std::set<std::string>& defined,
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std::set<std::string>& undefined) const;
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};
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#endif
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