[antlr-interest] Syntactic predicate in lexer rule

[Martin Traverso]

Hi all,

Happy new year!

I'm having some trouble with the following grammar. I would think the
syntactic predicate in FLOAT should be enough to distinguish between a FLOAT
and an INTEGER followed by two dots, but when parsing stuff like "1..2" the
lexer tries to match a FLOAT. Any ideas why?


grammar T;

range:  number ('..' number)?;
number: INTEGER | FLOAT;

FLOAT:  (DIGITS '.' DIGITS) => DIGITS '.' DIGITS;

INTEGER : DIGITS;

fragment
DIGITS: ('0'..'9')+;


Thanks!

Martin
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