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scope_chain.h
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/*
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* This file is part of the KDE libraries
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* Copyright (C) 2003 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef KJS_SCOPE_CHAIN_H
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#define KJS_SCOPE_CHAIN_H
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#include "global.h"
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namespace
KJS {
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class
ObjectImp;
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class
KJS_EXPORT
ScopeChainNode
{
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public
:
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ScopeChainNode
(
ScopeChainNode
*n, ObjectImp *o)
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: next(n), object(o), refCount(1) { }
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ScopeChainNode
*next;
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ObjectImp *object;
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int
refCount;
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};
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class
KJS_EXPORT
ScopeChain
{
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public
:
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ScopeChain
() : _node(0) { }
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~
ScopeChain
() { deref(); }
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ScopeChain
(
const
ScopeChain
&c) : _node(c._node)
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{
if
(_node) ++_node->refCount; }
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ScopeChain
&operator=(
const
ScopeChain
&);
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bool
isEmpty()
const
{
return
!_node; }
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ObjectImp *top()
const
{
return
_node->object; }
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ObjectImp *bottom()
const
{
const
ScopeChainNode
*n = _node;
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while
(n->next) n = n->next;
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return
n->object; }
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void
clear() { deref(); _node = 0; }
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void
push(ObjectImp *);
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void
pop();
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void
mark();
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private
:
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ScopeChainNode
*_node;
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void
deref() {
if
(_node && --_node->refCount == 0) release(); }
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void
ref()
const
;
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void
release();
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};
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}
// namespace KJS
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#endif // KJS_SCOPE_CHAIN_H
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