Hello,
I am new to ANTLR and I'd appreciate help with my problem. At first
some grammar rules I am going to talk about:
DIGIT: '0'..'9';
LETTER: 'a'..'z'|'A'..'Z';
REAL
: (DIGIT)+ '.' (DIGIT)* EXPONENT?
| '.' (DIGIT)+ EXPONENT?
| (DIGIT)+ EXPONENT
;
INTEGER: DIGIT+;
IDENTIFIER: LETTER+;
range_expr:
expr ('..' expr)?;
expr: expratom ('+' expratom)?;
expratom: INTEGER | REAL | IDENTIFIER;
This grammar allows '1.' and .1' as correct real numbers. Also, it
allows range expression '1..2', which gets parsed incorrectly as two
real numbers 1. and .2. Redefining token
INTEGER: DIGIT '..'?;
doesn't help, because then also valid range expression 'i + 1..2'. Is
there any way how to parse the '..' correctly in all cases?
Thank you very much,
Ondrej.
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