[antlr-interest] [Newbie] "keywords vs. identifiers": how can
I fix this?
mzukowski at yci.com
mzukowski at yci.com
Thu Apr 10 08:30:54 PDT 2003
http://www.antlr.org/doc/metalang.html#TokensSection
-----Original Message-----
From: Thiago F.G. Albuquerque [mailto:tfga at terra.com.br]
Sent: Thursday, April 10, 2003 8:28 AM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] [Newbie] "keywords vs. identifiers": how can I
fix this?
Hi,
I know this is probably a FAQ, but I couldn't figure it out for myself.
This is the classic "keywords vs. identifiers" problem.
I'm trying to make a lexer (just the lexer, no parser yet). Here are the
rules:
ID : LETRA (LETRA | DIGITO)* ;
INT : (DIGITO)+ ;
BOOL : "true"
| "false"
;
ANTLR Parser Generator Version 2.7.2 1989-2003 jGuru.com
grammar.g: warning:lexical nondeterminism between rules ID and BOOL upon
grammar.g: k==1:'f','t'
How can I fix this?
The docs say:
"(...) literals may be specified in the lexer grammar by means of the
literal option."
But there's no option named "literal".
I looked in the FAQ, but still didn't manage to get an answer.
Any help is apreciated.
Thiago
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