[antlr-interest] Need help in understanding DFA prediction

[Sam Harwell]

What's the definition for LETTER? If, for example, you have this:

 

LETTER : 'a'..'z' ;

 

Then Cake matches CATEGORYSTART because the capital letter C at the
beginning rules out all options but that. Does your LETTER rule allow
capital letters?

 

Sam

 

From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Sven Prevrhal
Sent: Monday, November 10, 2008 12:08 AM
To: antlr-interest at antlr.org
Subject: [antlr-interest] Need help in understanding DFA prediction

 

Hello and thanks Gurus:

 

I have a Lexer rule

 

CATEGORYSTART

                :               SPACE* 'Categories:';

 

and the call to DFA.Predict which originates from Lexer.mTokens()
predicts it for input like "Cake", and then of course the call to
mCATEGORYSTART() in the switch statement inside mTokens()after the
DFA.Predict call returns issues an error.

 

Sooo, how do I get DFA.Predict to predict the WORD rule for "Cake"
instead of CATEGORYSTART?

 

Here's my WORD rule:

WORD :                LETTER+;

 

Thank you and cheers,

Sven

 

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