[antlr-interest] Handling number Integer and real
Peizhao
peizhao at itee.uq.edu.au
Thu Aug 17 19:16:48 PDT 2006
Hi All,
I am new to antlr. I stuck with defining rules for numbers, such as
integer and real.
I defined the following rules. however, it gives warnings when I compile
them.
Rules:
==============================================
INTEGER : ('+'|'-')? ('0'..'9')+ ;
HEX_INTEGER : '0' ('x'|'X') ('0'..'9'|'A'..'F'|'a'..'f')+ ;
BINARY_INTEGER : '0' ('b'|'B') ('0'..'9')+ ;
REAL : ('+'|'-')? ( ('0'..'9')+ (('e'|'E') ('-'|'+')? ('0'..'9')+) |
(('0'..'9')+ '.' ('0'..'9')* (('e'|'E')('-'|'+')? ('0'..'9')+)?) ) |
( '.' ('0'..'9')+ (('e'|'E') ('-'|'+')? ('0'..'9')+)? );
Warnings:
=============================================
lexical nondeterminism between alts 1 and 2 of block upon k==1:'0'..'9'
k==2:'0'..'9' k==3:'0'..'9','E','e'
lexical nondeterminism between rules INTEGER and REAL upon
k==1:'+','-','0'..'9' k==2:'0'..'9' k==3:<end-of-token>,'0'..'9'
--
Regards;
Peizhao
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