| /* |
| [The "BSD license"] |
| Copyright (c) 2005-2009 Terence Parr |
| 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. |
| */ |
| package org.antlr.runtime.tree; |
| |
| import org.antlr.runtime.*; |
| |
| /** A node representing erroneous token range in token stream */ |
| public class CommonErrorNode extends CommonTree { |
| public IntStream input; |
| public Token start; |
| public Token stop; |
| public RecognitionException trappedException; |
| |
| public CommonErrorNode(TokenStream input, Token start, Token stop, |
| RecognitionException e) |
| { |
| //System.out.println("start: "+start+", stop: "+stop); |
| if ( stop==null || |
| (stop.getTokenIndex() < start.getTokenIndex() && |
| stop.getType()!=Token.EOF) ) |
| { |
| // 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; |
| } |
| |
| public boolean isNil() { |
| return false; |
| } |
| |
| public int getType() { |
| return Token.INVALID_TOKEN_TYPE; |
| } |
| |
| public String getText() { |
| String badText = null; |
| if ( start instanceof Token ) { |
| int i = ((Token)start).getTokenIndex(); |
| int j = ((Token)stop).getTokenIndex(); |
| if ( ((Token)stop).getType() == Token.EOF ) { |
| j = ((TokenStream)input).size(); |
| } |
| badText = ((TokenStream)input).toString(i, j); |
| } |
| else if ( start instanceof Tree ) { |
| badText = ((TreeNodeStream)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; |
| } |
| |
| public String toString() { |
| if ( trappedException instanceof MissingTokenException ) { |
| return "<missing type: "+ |
| ((MissingTokenException)trappedException).getMissingType()+ |
| ">"; |
| } |
| else if ( trappedException instanceof UnwantedTokenException ) { |
| return "<extraneous: "+ |
| ((UnwantedTokenException)trappedException).getUnexpectedToken()+ |
| ", resync="+getText()+">"; |
| } |
| else if ( trappedException instanceof MismatchedTokenException ) { |
| return "<mismatched token: "+trappedException.token+", resync="+getText()+">"; |
| } |
| else if ( trappedException instanceof NoViableAltException ) { |
| return "<unexpected: "+trappedException.token+ |
| ", resync="+getText()+">"; |
| } |
| return "<error: "+getText()+">"; |
| } |
| } |