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scope_chain.h
1/*
2 * This file is part of the KDE libraries
3 * Copyright (C) 2003 Apple Computer, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef KJS_SCOPE_CHAIN_H
23#define KJS_SCOPE_CHAIN_H
24
25#include "global.h"
26
27namespace KJS {
28
29 class ObjectImp;
30
34 class KJS_EXPORT ScopeChainNode {
35 public:
36 ScopeChainNode(ScopeChainNode *n, ObjectImp *o)
37 : next(n), object(o), refCount(1) { }
38
39 ScopeChainNode *next;
40 ObjectImp *object;
41 int refCount;
42 };
43
47 class KJS_EXPORT ScopeChain {
48 public:
49 ScopeChain() : _node(0) { }
50 ~ScopeChain() { deref(); }
51
52 ScopeChain(const ScopeChain &c) : _node(c._node)
53 { if (_node) ++_node->refCount; }
54 ScopeChain &operator=(const ScopeChain &);
55
56 bool isEmpty() const { return !_node; }
57 ObjectImp *top() const { return _node->object; }
58 ObjectImp *bottom() const { const ScopeChainNode *n = _node;
59 while (n->next) n = n->next;
60 return n->object; }
61
62 void clear() { deref(); _node = 0; }
63 void push(ObjectImp *);
64 void pop();
65
66 void mark();
67
68 private:
69 ScopeChainNode *_node;
70
71 void deref() { if (_node && --_node->refCount == 0) release(); }
72 void ref() const;
73
74 void release();
75 };
76
77} // namespace KJS
78
79#endif // KJS_SCOPE_CHAIN_H
KJS::ScopeChainNode
A scope chain node.
Definition: scope_chain.h:34
KJS::ScopeChain
A scope chain object.
Definition: scope_chain.h:47

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