[antlr-interest] nondeterminism problem
Jack Hong
jack_xu_hong at yahoo.ca
Fri Oct 11 19:47:45 PDT 2002
Thanks a lot, Xiaomin.
I understand your solution, should I declare BOOLEAN_LITERAL as a
"protected" token to avoid nondeterminism?
And where should I add the code you told me? Sorry, I'm really new to
ANTLR.
IDENT.equals("TRUE") ==> tokenType = BOOLEAN_LITERAL and tokenValue =
TRUE;
IDENT.equals("FALSE") ==> tokenType = BOOLEAN_LITERAL and tokeValue =
FALSE;
Thanks again.
Jack
-----Original Message-----
From: Xiangmin Wang [mailto:xiang4232002 at yahoo.com]
Sent: October 11, 2002 10:30 PM
To: antlr-interest at yahoogroups.com
Subject: Re: [antlr-interest] nondeterminism problem
One solution is to grab TRUE and FALSE as IDENT, then test the string,
as follows
IDENT.equals("TRUE") ==> tokenType = BOOLEAN_LITERAL and tokenValue =
TRUE;
IDENT.equals("FALSE") ==> tokenType = BOOLEAN_LITERAL and tokeValue =
FALSE;
else it is a IDENT token.
wxm
Jack Hong <jack_xu_hong at yahoo.ca> wrote:
Hi all,
I get following warning messages when I run ANTLR:
warning: lexical nondeterminism between rules IDENT and BOOLEAN_LITERAL
upon
petal.g:0: k==1:'F','T'
petal.g:0: k==2:'A','R'
petal.g:0: k==3:'L','U'
related token definitions in my grammar file:
BOOLEAN_LITERAL
: "TRUE"
| "FALSE"
;
IDENT
: ( 'a'..'z' | 'A'..'Z' | '_') ( 'a'..'z' | 'A'..'Z' | '_' |
'0'..'9')*
;
Any idea of how to fix these two nondeterministic tokens will be greatly
appreciated.
Thanks
Jack
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