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scope_chain.cpp
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 #include "scope_chain.h"
23 
24 #include "object.h"
25 
26 #include <assert.h>
27 
28 namespace KJS {
29 
30 inline void ScopeChain::ref() const
31 {
32  for (ScopeChainNode *n = _node; n; n = n->next) {
33  if (n->refCount++ != 0)
34  break;
35  }
36 }
37 
38 ScopeChain &ScopeChain::operator=(const ScopeChain &c)
39 {
40  c.ref();
41  deref();
42  _node = c._node;
43  return *this;
44 }
45 
46 void ScopeChain::push(ObjectImp *o)
47 {
48  assert(o);
49  _node = new ScopeChainNode(_node, o);
50 }
51 
52 void ScopeChain::pop()
53 {
54  ScopeChainNode *oldNode = _node;
55  assert(oldNode);
56  ScopeChainNode *newNode = oldNode->next;
57  _node = newNode;
58 
59  if (--oldNode->refCount != 0) {
60  if (newNode)
61  ++newNode->refCount;
62  } else {
63  delete oldNode;
64  }
65 }
66 
67 void ScopeChain::release()
68 {
69  // This function is only called by deref(),
70  // Deref ensures these conditions are true.
71  assert(_node && _node->refCount == 0);
72  ScopeChainNode *n = _node;
73  do {
74  ScopeChainNode *next = n->next;
75  delete n;
76  n = next;
77  } while (n && --n->refCount == 0);
78 }
79 
80 void ScopeChain::mark()
81 {
82  for (ScopeChainNode *n = _node; n; n = n->next) {
83  ObjectImp *o = n->object;
84  if (!o->marked())
85  o->mark();
86  }
87 }
88 
89 } // namespace KJS
KStdAccel::next
const KShortcut & next()
KJS
Definition: array_instance.h:28

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