[antlr-interest] newbie grammar question
Jim Idle
jimi at temporal-wave.com
Mon Jun 8 12:56:46 PDT 2009
Bruce Bauman wrote:
> I am trying to automate the translation of a huge base of Pascal source
> code from one dialect (MetaWare) to another (FreePascal).
>
> One change I need to make is to modify comments like this:
>
> -- This is a comment
>
> To this
>
> // This is a comment
>
> My current rule looks like this:
>
> SL_COMMENT_2
> : '--' (options {greedy=false;} : . )* '\n'
> {$channel=HIDDEN;}
> ;
>
> What's the easiest way to modify the rule so that '--' is replaced by
> '//'?
>
Easiest:
{ $text = '//' + $text.substring(2); }
But, you could also just do that when you come to actually sending out
the tokens as a rewritten stream.
Jim
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