89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/*=========================================================================
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Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
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See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices 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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/** \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 char* key);
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/** Set (or unset if null) a value associated with a key. */
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const char* Set(const char* key, const char* value);
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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<cmStdString> ClosureKeys() const;
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private:
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// String with existence boolean.
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struct Def: public cmStdString
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{
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Def(): cmStdString(), Exists(false) {}
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Def(const char* v): cmStdString(v?v:""), Exists(v?true:false) {}
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Def(Def const& d): cmStdString(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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typedef std::map<cmStdString, Def> MapType;
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MapType Map;
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// Internal query and update methods.
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Def const& GetInternal(const char* key);
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Def const& SetInternal(const char* 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<cmStdString>& undefined,
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cmDefinitions const* defs);
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// Implementation of ClosureKeys() method.
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void ClosureKeys(std::set<cmStdString>& defined,
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std::set<cmStdString>& undefined) const;
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};
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#endif
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