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80 lines
2.1 KiB
80 lines
2.1 KiB
15 years ago
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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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/**
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* A scope chain node.
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*/
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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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/**
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* A scope chain object.
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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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