[antlr-interest] comment must be preceded by whitespace

Terence Parr parrt at cs.usfca.edu
Wed Mar 17 16:09:54 PST 2004


On Mar 17, 2004, at 3:45 PM, charlesskelton wrote:

> I'm new to antlr.
>
> I'm trying to write lexer for a language, k, in which single line
> comments begin with a '/'. If there is no whitespace before the '/',
> or the '/' is not in column 1, then it is not a comment.

Try

comment : {getColumn()==1}? '/' (~'\n')* '\n' {newline();} ;

would that work?

Ter
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