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 */ 28package org.antlr.runtime.tree; 29 30import org.antlr.runtime.*; 31 32/** A node representing erroneous token range in token stream */ 33public class CommonErrorNode extends CommonTree { 34 public IntStream input; 35 public Token start; 36 public Token stop; 37 public RecognitionException trappedException; 38 39 public CommonErrorNode(TokenStream input, Token start, Token stop, 40 RecognitionException e) 41 { 42 //System.out.println("start: "+start+", stop: "+stop); 43 if ( stop==null || 44 (stop.getTokenIndex() < start.getTokenIndex() && 45 stop.getType()!=Token.EOF) ) 46 { 47 // sometimes resync does not consume a token (when LT(1) is 48 // in follow set. So, stop will be 1 to left to start. adjust. 49 // Also handle case where start is the first token and no token 50 // is consumed during recovery; LT(-1) will return null. 51 stop = start; 52 } 53 this.input = input; 54 this.start = start; 55 this.stop = stop; 56 this.trappedException = e; 57 } 58 59 public boolean isNil() { 60 return false; 61 } 62 63 public int getType() { 64 return Token.INVALID_TOKEN_TYPE; 65 } 66 67 public String getText() { 68 String badText = null; 69 if ( start instanceof Token ) { 70 int i = ((Token)start).getTokenIndex(); 71 int j = ((Token)stop).getTokenIndex(); 72 if ( ((Token)stop).getType() == Token.EOF ) { 73 j = ((TokenStream)input).size(); 74 } 75 badText = ((TokenStream)input).toString(i, j); 76 } 77 else if ( start instanceof Tree ) { 78 badText = ((TreeNodeStream)input).toString(start, stop); 79 } 80 else { 81 // people should subclass if they alter the tree type so this 82 // next one is for sure correct. 83 badText = "<unknown>"; 84 } 85 return badText; 86 } 87 88 public String toString() { 89 if ( trappedException instanceof MissingTokenException ) { 90 return "<missing type: "+ 91 ((MissingTokenException)trappedException).getMissingType()+ 92 ">"; 93 } 94 else if ( trappedException instanceof UnwantedTokenException ) { 95 return "<extraneous: "+ 96 ((UnwantedTokenException)trappedException).getUnexpectedToken()+ 97 ", resync="+getText()+">"; 98 } 99 else if ( trappedException instanceof MismatchedTokenException ) { 100 return "<mismatched token: "+trappedException.token+", resync="+getText()+">"; 101 } 102 else if ( trappedException instanceof NoViableAltException ) { 103 return "<unexpected: "+trappedException.token+ 104 ", resync="+getText()+">"; 105 } 106 return "<error: "+getText()+">"; 107 } 108} 109