1 /* 2 * [The "BSD licence"] 3 * Copyright (c) 2005-2008 Terence Parr 4 * All rights reserved. 5 * 6 * Conversion to C#: 7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 namespace Antlr.Runtime.Tree { 34 35 /** <summary>A node representing erroneous token range in token stream</summary> */ 36 [System.Serializable] 37 public class CommonErrorNode : CommonTree { 38 public IIntStream input; 39 public IToken start; 40 public IToken stop; 41 public RecognitionException trappedException; 42 CommonErrorNode(ITokenStream input, IToken start, IToken stop, RecognitionException e)43 public CommonErrorNode(ITokenStream input, IToken start, IToken stop, 44 RecognitionException e) { 45 //System.out.println("start: "+start+", stop: "+stop); 46 if (stop == null || 47 (stop.TokenIndex < start.TokenIndex && 48 stop.Type != TokenTypes.EndOfFile)) { 49 // sometimes resync does not consume a token (when LT(1) is 50 // in follow set. So, stop will be 1 to left to start. adjust. 51 // Also handle case where start is the first token and no token 52 // is consumed during recovery; LT(-1) will return null. 53 stop = start; 54 } 55 this.input = input; 56 this.start = start; 57 this.stop = stop; 58 this.trappedException = e; 59 } 60 61 #region Properties 62 public override bool IsNil { 63 get { 64 return false; 65 } 66 } 67 public override string Text { 68 get { 69 string badText = null; 70 if (start is IToken) { 71 int i = ((IToken)start).TokenIndex; 72 int j = ((IToken)stop).TokenIndex; 73 if (((IToken)stop).Type == TokenTypes.EndOfFile) { 74 j = ((ITokenStream)input).Count; 75 } 76 badText = ((ITokenStream)input).ToString(i, j); 77 } else if (start is ITree) { 78 badText = ((ITreeNodeStream)input).ToString(start, stop); 79 } else { 80 // people should subclass if they alter the tree type so this 81 // next one is for sure correct. 82 badText = "<unknown>"; 83 } 84 return badText; 85 } 86 set { 87 } 88 } 89 public override int Type { 90 get { 91 return TokenTypes.Invalid; 92 } 93 set { 94 } 95 } 96 #endregion 97 ToString()98 public override string ToString() { 99 if (trappedException is MissingTokenException) { 100 return "<missing type: " + 101 ((MissingTokenException)trappedException).MissingType + 102 ">"; 103 } else if (trappedException is UnwantedTokenException) { 104 return "<extraneous: " + 105 ((UnwantedTokenException)trappedException).UnexpectedToken + 106 ", resync=" + Text + ">"; 107 } else if (trappedException is MismatchedTokenException) { 108 return "<mismatched token: " + trappedException.Token + ", resync=" + Text + ">"; 109 } else if (trappedException is NoViableAltException) { 110 return "<unexpected: " + trappedException.Token + 111 ", resync=" + Text + ">"; 112 } 113 return "<error: " + Text + ">"; 114 } 115 } 116 } 117