[antlr-interest] about space between operator
李志鹏
lizhipeng at gmail.com
Sun Dec 4 23:14:13 PST 2011
hello all
I have a very simple grammar like this:
grammar AA;
expression
: TYPE_DOUBLE (NOTEQUALS | LT) TYPE_DOUBLE EOF
;
NOTEQUALS
: '<>' | '<' (' '+) '>'
;
LT : '<';
TYPE_DOUBLE
: Digit+ '.' Digit*
| '.' Digit+
;
fragment
Digit
: '0'..'9'
;
WS
: (' '|'\r'|'\t'|'\u000C'|'\n')+ {$channel=HIDDEN;}
;
if input "1.6<>1.7" or "1.6<1.7" or "1.6 <> 1.7", it is ok
but input "1.6 < 1.7"(has white space on both sides '<' ), the grammar
can't resolve it
if I change as this
NOTEQUALS
: '<>'
;
above all are ok, but "1.6 < > 1.7" is not work, I wan't use "<>" to mean
not equal, and white space is allow between "< >", How Can i do?
thank you all
More information about the antlr-interest
mailing list