| package org.antlr.runtime.tree |
| { |
| |
| import org.antlr.runtime.*; |
| |
| public class CommonErrorNode extends CommonTree { |
| |
| public var input:IntStream; |
| public var start:Token; |
| public var stop:Token; |
| public var trappedException:RecognitionException; |
| |
| public function CommonErrorNode(input:TokenStream, start:Token, stop:Token, |
| e:RecognitionException) |
| { |
| //System.out.println("start: "+start+", stop: "+stop); |
| if ( stop==null || |
| (stop.tokenIndex < start.tokenIndex && |
| stop.type!=TokenConstants.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 override function get isNil():Boolean { |
| return false; |
| } |
| |
| public function getType():int { |
| return TokenConstants.INVALID_TOKEN_TYPE; |
| } |
| |
| public function getText():String { |
| var badText:String = null; |
| if ( start is Token ) { |
| var i:int = Token(start).tokenIndex; |
| var j:int = Token(stop).tokenIndex; |
| if ( Token(stop).type == TokenConstants.EOF ) { |
| j = TokenStream(input).size; |
| } |
| badText = TokenStream(input).toStringWithRange(i, j); |
| } |
| else if ( start is Tree ) { |
| badText = TreeNodeStream(input).toStringWithRange(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 override function toString():String { |
| if ( trappedException is MissingTokenException ) { |
| return "<missing type: "+ |
| MissingTokenException(trappedException).missingType+ |
| ">"; |
| } |
| else if ( trappedException is UnwantedTokenException ) { |
| return "<extraneous: "+ |
| UnwantedTokenException(trappedException).unexpectedToken+ |
| ", resync="+getText()+">"; |
| } |
| else if ( trappedException is MismatchedTokenException ) { |
| return "<mismatched token: "+trappedException.token+", resync="+getText()+">"; |
| } |
| else if ( trappedException is NoViableAltException ) { |
| return "<unexpected: "+trappedException.token+ |
| ", resync="+getText()+">"; |
| } |
| return "<error: "+getText()+">"; |
| } |
| |
| } |
| } |