pjs/js/js2/world.h

// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
//
// The contents of this file are subject to the Netscape Public
// License Version 1.1 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of
// the License at http://www.mozilla.org/NPL/
//
// Software distributed under the License is distributed on an "AS
// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
// implied. See the License for the specific language governing
// rights and limitations under the License.
//
// The Original Code is the JavaScript 2 Prototype.
//
// The Initial Developer of the Original Code is Netscape
// Communications Corporation.  Portions created by Netscape are
// Copyright (C) 1998 Netscape Communications Corporation. All
// Rights Reserved.

#ifndef world_h
#define world_h

#include "utilities.h"
#include "hash.h"
#include "parser.h"

namespace JavaScript {

//
// String atom management
//

// A StringAtom is a String for which the following guarantee applies:
// StringAtoms A and B have the same character sequences if and only if A and B are the
// same StringAtom.

	class StringAtom: public String {
	  public:
		Token::Kind tokenKind;			// Token::Kind if this is a keyword; Token::identifier if not

		explicit StringAtom(const String &s): String(s), tokenKind(Token::identifier) {}
	  private:
	    StringAtom(const StringAtom&);		// No copy constructor
	    void operator=(const StringAtom&);	// No assignment operator
	};

	inline bool operator==(const StringAtom &s1, const StringAtom &s2) {return &s1 == &s2;}
	inline bool operator!=(const StringAtom &s1, const StringAtom &s2) {return &s1 != &s2;}


	class StringAtomTable {
		typedef HashTable<StringAtom, const String&> HT;
		HT ht;
	
	  public:
		StringAtom &operator[](const String &s);
	};


	class World {
	  public:
		StringAtomTable identifiers;
		
		World();
	};
}
#endif