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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.
============================================================================*/
#include "cmDefinitions.h"
//----------------------------------------------------------------------------
cmDefinitions::Def cmDefinitions::NoDef;
//----------------------------------------------------------------------------
cmDefinitions::cmDefinitions(cmDefinitions* parent): Up(parent)
{
}
//----------------------------------------------------------------------------
void cmDefinitions::Reset(cmDefinitions* parent)
{
this->Up = parent;
this->Map.clear();
}
//----------------------------------------------------------------------------
cmDefinitions::Def const&
cmDefinitions::GetInternal(const char* key)
{
MapType::const_iterator i = this->Map.find(key);
if(i != this->Map.end())
{
return i->second;
}
else if(cmDefinitions* up = this->Up)
{
// Query the parent scope and store the result locally.
Def def = up->GetInternal(key);
return this->Map.insert(MapType::value_type(key, def)).first->second;
}
return this->NoDef;
}
//----------------------------------------------------------------------------
cmDefinitions::Def const&
cmDefinitions::SetInternal(const char* key, Def const& def)
{
if(this->Up || def.Exists)
{
// In lower scopes we store keys, defined or not.
MapType::iterator i = this->Map.find(key);
if(i == this->Map.end())
{
i = this->Map.insert(MapType::value_type(key, def)).first;
}
else
{
i->second = def;
}
return i->second;
}
else
{
// In the top-most scope we need not store undefined keys.
this->Map.erase(key);
return this->NoDef;
}
}
//----------------------------------------------------------------------------
const char* cmDefinitions::Get(const char* key)
{
Def const& def = this->GetInternal(key);
return def.Exists? def.c_str() : 0;
}
//----------------------------------------------------------------------------
const char* cmDefinitions::Set(const char* key, const char* value)
{
Def const& def = this->SetInternal(key, Def(value));
return def.Exists? def.c_str() : 0;
}
//----------------------------------------------------------------------------
cmDefinitions cmDefinitions::Closure() const
{
return cmDefinitions(ClosureTag(), this);
}
//----------------------------------------------------------------------------
cmDefinitions::cmDefinitions(ClosureTag const&, cmDefinitions const* root):
Up(0)
{
std::set<cmStdString> undefined;
this->ClosureImpl(undefined, root);
}
//----------------------------------------------------------------------------
void cmDefinitions::ClosureImpl(std::set<cmStdString>& undefined,
cmDefinitions const* defs)
{
// Consider local definitions.
for(MapType::const_iterator mi = defs->Map.begin();
mi != defs->Map.end(); ++mi)
{
// Use this key if it is not already set or unset.
if(this->Map.find(mi->first) == this->Map.end() &&
undefined.find(mi->first) == undefined.end())
{
if(mi->second.Exists)
{
this->Map.insert(*mi);
}
else
{
undefined.insert(mi->first);
}
}
}
// Traverse parents.
if(cmDefinitions const* up = defs->Up)
{
this->ClosureImpl(undefined, up);
}
}
//----------------------------------------------------------------------------
std::set<cmStdString> cmDefinitions::ClosureKeys() const
{
std::set<cmStdString> defined;
std::set<cmStdString> undefined;
this->ClosureKeys(defined, undefined);
return defined;
}
//----------------------------------------------------------------------------
void cmDefinitions::ClosureKeys(std::set<cmStdString>& defined,
std::set<cmStdString>& undefined) const
{
// Consider local definitions.
for(MapType::const_iterator mi = this->Map.begin();
mi != this->Map.end(); ++mi)
{
// Use this key if it is not already set or unset.
if(defined.find(mi->first) == defined.end() &&
undefined.find(mi->first) == undefined.end())
{
std::set<cmStdString>& m = mi->second.Exists? defined : undefined;
m.insert(mi->first);
}
}
// Traverse parents.
if(cmDefinitions const* up = this->Up)
{
up->ClosureKeys(defined, undefined);
}
}
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