| /* |
| * [The "BSD licence"] |
| * Copyright (c) 2005-2008 Terence Parr |
| * All rights reserved. |
| * |
| * Conversion to C#: |
| * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| namespace Antlr.Runtime.Tree { |
| |
| /** <summary>A node representing erroneous token range in token stream</summary> */ |
| [System.Serializable] |
| public class CommonErrorNode : CommonTree { |
| public IIntStream input; |
| public IToken start; |
| public IToken stop; |
| public RecognitionException trappedException; |
| |
| public CommonErrorNode(ITokenStream input, IToken start, IToken stop, |
| RecognitionException e) { |
| //System.out.println("start: "+start+", stop: "+stop); |
| if (stop == null || |
| (stop.TokenIndex < start.TokenIndex && |
| stop.Type != TokenTypes.EndOfFile)) { |
| // sometimes resync does not consume a token (when LT(1) is |
| // in follow set. So, stop will be 1 to left to start. adjust. |
| // Also handle case where start is the first token and no token |
| // is consumed during recovery; LT(-1) will return null. |
| stop = start; |
| } |
| this.input = input; |
| this.start = start; |
| this.stop = stop; |
| this.trappedException = e; |
| } |
| |
| #region Properties |
| public override bool IsNil { |
| get { |
| return false; |
| } |
| } |
| public override string Text { |
| get { |
| string badText = null; |
| if (start is IToken) { |
| int i = ((IToken)start).TokenIndex; |
| int j = ((IToken)stop).TokenIndex; |
| if (((IToken)stop).Type == TokenTypes.EndOfFile) { |
| j = ((ITokenStream)input).Count; |
| } |
| badText = ((ITokenStream)input).ToString(i, j); |
| } else if (start is ITree) { |
| badText = ((ITreeNodeStream)input).ToString(start, stop); |
| } else { |
| // people should subclass if they alter the tree type so this |
| // next one is for sure correct. |
| badText = "<unknown>"; |
| } |
| return badText; |
| } |
| set { |
| } |
| } |
| public override int Type { |
| get { |
| return TokenTypes.Invalid; |
| } |
| set { |
| } |
| } |
| #endregion |
| |
| public override string ToString() { |
| if (trappedException is MissingTokenException) { |
| return "<missing type: " + |
| ((MissingTokenException)trappedException).MissingType + |
| ">"; |
| } else if (trappedException is UnwantedTokenException) { |
| return "<extraneous: " + |
| ((UnwantedTokenException)trappedException).UnexpectedToken + |
| ", resync=" + Text + ">"; |
| } else if (trappedException is MismatchedTokenException) { |
| return "<mismatched token: " + trappedException.Token + ", resync=" + Text + ">"; |
| } else if (trappedException is NoViableAltException) { |
| return "<unexpected: " + trappedException.Token + |
| ", resync=" + Text + ">"; |
| } |
| return "<error: " + Text + ">"; |
| } |
| } |
| } |