Antlr.Runtime.BaseRecognizer.GetMissingSymbol C# (CSharp) Method

BaseRecognizer Class Documentation Exibir arquivo Open project: antlr/antlrcs

GetMissingSymbol() protected method

Conjure up a missing token during error recovery.

* The recognizer attempts to recover from single missing * symbols. But, actions might refer to that missing symbol. * For example, x=ID {f($x);}. The action clearly assumes * that there has been an identifier matched previously and that * $x points at that token. If that token is missing, but * the next token in the stream is what we want we assume that * this token is missing and we keep going. Because we * have to return some token to replace the missing token, * we have to conjure one up. This method gives the user control * over the tokens returned for missing tokens. Mostly, * you will want to create something special for identifier * tokens. For literals such as '{' and ',', the default * action in the parser or tree parser works. It simply creates * a CommonToken of the appropriate type. The text will be the token. * If you change what tokens must be created by the lexer, * override this method to create the appropriate tokens. *

protected GetMissingSymbol ( IIntStream input, RecognitionException e, int expectedTokenType, BitSet follow ) : object
input	IIntStream
e	RecognitionException
expectedTokenType	int
follow	BitSet
return	object

        protected virtual object GetMissingSymbol( IIntStream input,
                                          RecognitionException e,
                                          int expectedTokenType,
                                          BitSet follow )
        {
            return null;
        }

BaseRecognizer

AlreadyParsedRule

BaseRecognizer

BeginResync

CombineFollows

ComputeContextSensitiveRuleFOLLOW

ComputeErrorRecoverySet

ConsumeUntil

DebugBeginBacktrack

DebugEndBacktrack

DebugEnterAlt

DebugEnterDecision