1 /* 2 [The "BSD license"] 3 Copyright (c) 2005-2009 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 */ 28 package org.antlr.runtime.debug; 29 30 import org.antlr.runtime.*; 31 32 import java.io.IOException; 33 34 public class DebugParser extends Parser { 35 /** Who to notify when events in the parser occur. */ 36 protected DebugEventListener dbg = null; 37 38 /** Used to differentiate between fixed lookahead and cyclic DFA decisions 39 * while profiling. 40 */ 41 public boolean isCyclicDecision = false; 42 43 /** Create a normal parser except wrap the token stream in a debug 44 * proxy that fires consume events. 45 */ 46 public DebugParser(TokenStream input, DebugEventListener dbg, RecognizerSharedState state) { 47 super(input instanceof DebugTokenStream?input:new DebugTokenStream(input,dbg), state); 48 setDebugListener(dbg); 49 } 50 51 public DebugParser(TokenStream input, RecognizerSharedState state) { 52 super(input instanceof DebugTokenStream?input:new DebugTokenStream(input,null), state); 53 } 54 55 public DebugParser(TokenStream input, DebugEventListener dbg) { 56 this(input instanceof DebugTokenStream?input:new DebugTokenStream(input,dbg), dbg, null); 57 } 58 59 /** Provide a new debug event listener for this parser. Notify the 60 * input stream too that it should send events to this listener. 61 */ 62 public void setDebugListener(DebugEventListener dbg) { 63 if ( input instanceof DebugTokenStream ) { 64 ((DebugTokenStream)input).setDebugListener(dbg); 65 } 66 this.dbg = dbg; 67 } 68 69 public DebugEventListener getDebugListener() { 70 return dbg; 71 } 72 73 public void reportError(IOException e) { 74 System.err.println(e); 75 e.printStackTrace(System.err); 76 } 77 78 public void beginResync() { 79 dbg.beginResync(); 80 } 81 82 public void endResync() { 83 dbg.endResync(); 84 } 85 86 public void beginBacktrack(int level) { 87 dbg.beginBacktrack(level); 88 } 89 90 public void endBacktrack(int level, boolean successful) { 91 dbg.endBacktrack(level,successful); 92 } 93 94 public void reportError(RecognitionException e) { 95 super.reportError(e); 96 dbg.recognitionException(e); 97 } 98 } 99
