[antlr-interest] AntLR Bug
Michael Labhard
ince at pacifier.com
Mon Feb 4 16:33:44 PST 2002
This is the simplified example that fails to work with AntLR. I don't see
any additional opportunity for left-factoring here.
class L extends Lexer;
options { k=2; }
NAME_TOKEN
: GRAPHIC_TOKEN
;
END_TOKEN
:
END_CHAR
( options {greedy=true;} :
GRAPHIC_TOKEN_CHAR {setType(GRAPHIC_TOKEN);}
)+
;
protected GRAPHIC_TOKEN
:
( options {greedy=true;} :
END_CHAR ( GRAPHIC_TOKEN_CHAR )+
)
;
protected GRAPHIC_TOKEN_CHAR
: GRAPHIC_CHAR
;
protected GRAPHIC_CHAR
: ( options {greedy=true;} : '#'|'$'|'&'|'*'|'+'|'/'|
|':'|'<'|'='|'>'|'?'|'@'|'^'|'~');
protected END_CHAR:
'.'
;
RESULTS:
ANTLR Parser Generator Version 2.7.1 1989-2000 jGuru.com
warning: lexical nondeterminism between rules NAME_TOKEN and END_TOKEN upon
TermParser2.g:0: k==1:'.'
TermParser2.g:0:
k==2:<end-of-token>,'#','$','&','*','+','/',':','<'..'@','^','~'
TermParser2.g:19: warning: lexical nondeterminism upon
TermParser2.g:19: k==1:<end-of-token>
TermParser2.g:19: k==2:<end-of-token>
TermParser2.g:19: between alt 1 and exit branch of block
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