scope_chain.h
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00022 #ifndef KJS_SCOPE_CHAIN_H
00023 #define KJS_SCOPE_CHAIN_H
00024 
00025 namespace KJS {
00026 
00027     class ObjectImp;
00028     
00029     class ScopeChainNode {
00030     public:
00031         ScopeChainNode(ScopeChainNode *n, ObjectImp *o)
00032             : next(n), object(o), refCount(1) { }
00033 
00034         ScopeChainNode *next;
00035         ObjectImp *object;
00036         int refCount;
00037     };
00038 
00039     class ScopeChain {
00040     public:
00041         ScopeChain() : _node(0) { }
00042         ~ScopeChain() { deref(); }
00043 
00044         ScopeChain(const ScopeChain &c) : _node(c._node)
00045             { if (_node) ++_node->refCount; }
00046         ScopeChain &operator=(const ScopeChain &);
00047 
00048         bool isEmpty() const { return !_node; }
00049         ObjectImp *top() const { return _node->object; }
00050         ObjectImp *bottom() const { const ScopeChainNode *n = _node;
00051                     while (n->next) n = n->next;
00052                     return n->object; }
00053 
00054         void clear() { deref(); _node = 0; }
00055         void push(ObjectImp *);
00056         void pop();
00057         
00058         void mark();
00059         
00060     private:
00061         ScopeChainNode *_node;
00062         
00063         void deref() { if (_node && --_node->refCount == 0) release(); }
00064         void ref() const;
00065         
00066         void release();
00067     };
00068 
00069 } 
00070 
00071 #endif // KJS_SCOPE_CHAIN_H
 
This file is part of the documentation for kjs Library Version 3.2.0.