[antlr-interest] Lexing problem I cannot resolve

[Thomas Brandon]

The grammar below parses the lines of the input (Note the final line
is required given the grammar):
1
1.0
1.
.1
1..0

as INT, FLOAT, FLOAT, FLOAT and INT RANGE INT respectively. You should
bea ble to get what you want out of that. Tested under ANTLR 3.0.1.


Grammar:
grammar test;

test
	:(	(	int1
		|	float1
		|	range
		) NL
	)+ EOF
	;

int1	:	INT;

float1
	:	FLOAT;

range
	:	INT RANGE INT;

fragment DIGIT: '0'..'9';

RANGE: '..' ;

INT
  	:	DIGIT+ ( ('.' ~'.')=> '.' DIGIT* {$type=FLOAT;} )?
  	;

FLOAT:	'.' DIGIT+;

NL	:	('\n'|'\r')+;


Tom.

On Thu, Aug 7, 2008 at 5:07 AM, Carter Cheng <carter_cheng at yahoo.com> wrote:
> I tried this variant too but it does not seem to parse correctly(see attached). It still thinks that the 1. is a FLOAT token. Perhaps I have run afoul of some bug in 3.0.1?
>
> Regards,
>
> Carter.
>