1 files changed, 89 insertions, 0 deletions
diff --git a/kjs/scope_chain.cpp b/kjs/scope_chain.cpp
new file mode 100644
index 000000000..76eefe973
--- /dev/null
+++ b/kjs/scope_chain.cpp
@@ -0,0 +1,89 @@
+/*
+ *  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.
+ *
+ */
+
+#include "scope_chain.h"
+
+#include "object.h"
+
+#include <assert.h>
+
+namespace KJS {
+
+inline void ScopeChain::ref() const
+{
+    for (ScopeChainNode *n = _node; n; n = n->next) {
+        if (n->refCount++ != 0)
+            break;
+    }
+}
+
+ScopeChain &ScopeChain::operator=(const ScopeChain &c)
+{
+    c.ref();
+    deref();
+    _node = c._node;
+    return *this;
+}
+
+void ScopeChain::push(ObjectImp *o)
+{
+    assert(o);
+    _node = new ScopeChainNode(_node, o);
+}
+
+void ScopeChain::pop()
+{
+    ScopeChainNode *oldNode = _node;
+    assert(oldNode);
+    ScopeChainNode *newNode = oldNode->next;
+    _node = newNode;
+    
+    if (--oldNode->refCount != 0) {
+        if (newNode)
+            ++newNode->refCount;
+    } else {
+        delete oldNode;
+    }
+}
+
+void ScopeChain::release()
+{
+    // This function is only called by deref(),
+    // Deref ensures these conditions are true.
+    assert(_node && _node->refCount == 0);
+    ScopeChainNode *n = _node;
+    do {
+        ScopeChainNode *next = n->next;
+        delete n;
+        n = next;
+    } while (n && --n->refCount == 0);
+}
+
+void ScopeChain::mark()
+{
+    for (ScopeChainNode *n = _node; n; n = n->next) {
+        ObjectImp *o = n->object;
+        if (!o->marked())
+            o->mark();
+    }
+}
+
+} // namespace KJS