01: /*
02: [The "BSD licence"]
03: Copyright (c) 2005-2006 Terence Parr
04: All rights reserved.
05:
06: Redistribution and use in source and binary forms, with or without
07: modification, are permitted provided that the following conditions
08: are met:
09: 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: */
28: package org.antlr.runtime;
29:
30: /** A parser for TokenStreams. "parser grammars" result in a subclass
31: * of this.
32: */
33: public class Parser extends BaseRecognizer {
34: protected TokenStream input;
35:
36: public Parser(TokenStream input) {
37: setTokenStream(input);
38: }
39:
40: public void reset() {
41: super .reset(); // reset all recognizer state variables
42: if (input != null) {
43: input.seek(0); // rewind the input
44: }
45: }
46:
47: /** Set the token stream and reset the parser */
48: public void setTokenStream(TokenStream input) {
49: this .input = null;
50: reset();
51: this .input = input;
52: }
53:
54: public TokenStream getTokenStream() {
55: return input;
56: }
57:
58: public void traceIn(String ruleName, int ruleIndex) {
59: super .traceIn(ruleName, ruleIndex, input.LT(1));
60: }
61:
62: public void traceOut(String ruleName, int ruleIndex) {
63: super .traceOut(ruleName, ruleIndex, input.LT(1));
64: }
65: }
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