[antlr-interest] Parser Problem for comment
Michael
micha-1 at fantasymail.de
Tue Jun 9 03:59:55 PDT 2009
Am Tuesday 09 June 2009 12:01:41 schrieb virg g:
> Hi,
>
> COMMENT : '\'' ~('\n'|'\r')* {$channel=HIDDEN;} ;
>
> This is working well, if there is no single quote occurs within the
> instruction. If single quote occurs in the instruction other than at the
> beginning of the file, the text after single quote is treating as a
> comment. So How to write a rule only if line starts with single quote then
> it is comment not any where else? please help me.
do you have a rule for NL? Something like
NL: '\r'? '\n' ; // or similar...
does it work to change it to:
NL: ('\r'? '\n')+ ( '\'' ~('\n'|'\r')* )? ; // to include a following
comment
or a semantic predicate which tests the column number
or maybe it's easier to use a file reader which just drops the lines
beginning with a ' :-)
cheers,
Michael
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