[antlr-interest] Need help in understanding DFA prediction
Sven Prevrhal
sprevrha at gmail.com
Sun Nov 9 23:25:20 PST 2008
Sam,
It does -
fragment LETTER : 'a'..'z' | 'A'..'Z';
Perhaps the 'fragment' is a problem?
Sven
From: Sam Harwell [mailto:sharwell at pixelminegames.com]
Sent: Sunday, November 09, 2008 10:52 PM
To: sven.prevrhal at ucsf.edu; antlr-interest at antlr.org
Subject: RE: [antlr-interest] Need help in understanding DFA prediction
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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