[antlr-interest] Grammar handling of whitespaces
Johannes Luber
jaluber at gmx.de
Thu Feb 7 06:20:07 PST 2008
Shawn Poulson schrieb:
> Hello all,
>
> I've had success so far with generating my grammar for my C# target,
> with help from several individuals here. One of the tips I've used is
> to use a lexer rule to skip whitespaces using a rule like:
>
> WS : (' '|'\r'|'\t'|'\n') { $channel=HIDDEN; }
>
> This is very helpful for most parser rules, so I don't have to
> explicitly put whitespaces throughout my parser rules. But, there are
> times where I don't want whitespaces between certain elements. Is
> there a way to handle this?
Untested yet, but this should work:
arrow
: first=ASSIGNMENT second=GT {$first.index + 1 == $second.index}? //
Nothing between the tokens?
;
Johannes
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