[antlr-interest] Lexical k=3

[John Green]

This one looks like it should be easy, but I can't figure it out, and
because of the larger context of my lexer, I haven't come up with a good
workaround. Any pointers from this good mailing list?

For k==2:'~' I don't think that it should be trying to enter *either* of
the two rules.

-----
C:\work\antlr>java -cp /progfile/antlr antlr.Tool test.g
ANTLR Parser Generator   Version 2.7.1+ (RK devel version)   1989-2000
jGuru.com

warning: lexical nondeterminism between rules TEST_ONE and TEST_TWO upon
test.g:0:       k==1:'~'
test.g:0:       k==2:'~'
test.g:0:       k==3:<end-of-token>,'~'
-----


-----
// test.g

class Test extends Lexer;
options {
	k=3;
}

TEST_ONE
	:
		(	('~')?
			(	' '
			|	'\t'
			|	'\f'
			|	'\n' { newline(); }
			|	'\r'
			)
		)+
	;

TEST_TWO
	:	(	'\\'|'/'|'#'|'%'
		|	"~\""
		|	"~\'"
		)
		(	'a'..'z'|'_'|'0'..'9'|'#'|'$'|'%'|'&'|'-'|'\\'|'/'
		|	"~\""
		|	"~\'"
		)+
	;
-----


Thanks,
John


 

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