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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce4a32fe52ef09d8f5ff1dd22c001110902b60a2 (patch)
tree5ac38a06f3dde268dc7927dc155896926aaf7012 /kjs/scope_chain.h
downloadtdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.tar.gz
tdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+/*
+ * This file is part of the KDE libraries
+ * Copyright (C) 2003 Apple Computer, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef KJS_SCOPE_CHAIN_H
+#define KJS_SCOPE_CHAIN_H
+
+#include "global.h"
+
+namespace KJS {
+
+ class ObjectImp;
+
+/**
+* A scope chain node.
+*/
+ class KJS_EXPORT ScopeChainNode {
+ public:
+ ScopeChainNode(ScopeChainNode *n, ObjectImp *o)
+ : next(n), object(o), refCount(1) { }
+
+ ScopeChainNode *next;
+ ObjectImp *object;
+ int refCount;
+ };
+
+/**
+* A scope chain object.
+*/
+ class KJS_EXPORT ScopeChain {
+ public:
+ ScopeChain() : _node(0) { }
+ ~ScopeChain() { deref(); }
+
+ ScopeChain(const ScopeChain &c) : _node(c._node)
+ { if (_node) ++_node->refCount; }
+ ScopeChain &operator=(const ScopeChain &);
+
+ bool isEmpty() const { return !_node; }
+ ObjectImp *top() const { return _node->object; }
+ ObjectImp *bottom() const { const ScopeChainNode *n = _node;
+ while (n->next) n = n->next;
+ return n->object; }
+
+ void clear() { deref(); _node = 0; }
+ void push(ObjectImp *);
+ void pop();
+
+ void mark();
+
+ private:
+ ScopeChainNode *_node;
+
+ void deref() { if (_node && --_node->refCount == 0) release(); }
+ void ref() const;
+
+ void release();
+ };
+
+} // namespace KJS
+
+#endif // KJS_SCOPE_CHAIN_H