RewriteRuleTokenStream.as revision 324c4644fee44b9898524c09511bd33c3f12e2df 
1/*
2 [The "BSD licence"]
3 Copyright (c) 2005-2006 Terence Parr
4 All rights reserved.
5
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions
8 are met:
9 1. Redistributions of source code must retain the above copyright
10    notice, this list of conditions and the following disclaimer.
11 2. Redistributions in binary form must reproduce the above copyright
12    notice, this list of conditions and the following disclaimer in the
13    documentation and/or other materials provided with the distribution.
14 3. The name of the author may not be used to endorse or promote products
15    derived from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27*/
28package org.antlr.runtime.tree {
29    import org.antlr.runtime.Token;
30
31
32    public class RewriteRuleTokenStream extends RewriteRuleElementStream {
33
34        public function RewriteRuleTokenStream(adaptor:TreeAdaptor, elementDescription:String, element:Object=null) {
35            super(adaptor, elementDescription, element);
36        }
37
38    	/** Get next token from stream and make a node for it */
39    	public function nextNode():Object {
40    		var t:Token = Token(_next());
41    		return adaptor.createWithPayload(t);
42    	}
43
44    	public function nextToken():Token {
45    		return Token(_next());
46    	}
47
48    	/** Don't convert to a tree unless they explicitly call nextTree.
49    	 *  This way we can do hetero tree nodes in rewrite.
50    	 */
51    	protected override function toTree(el:Object):Object {
52    		return el;
53    	}
54
55    	protected override function dup(el:Object):Object {
56    		throw new Error("dup can't be called for a token stream.");
57    	}
58
59    }
60}