Re: Java Comment-Preserving Grammar

matthew-google@faredge.com.au (Matthew Herrmann) wrote


> My end goal is to parse commented-out extensions to the java language:
>
> class /*#immutable*/ Blah {
>
> public /*#input*/ int x;
> public /*#result*/ int y;
>
> }
>
> Any suggestions appreciated,


Comments are usually handled by the lexer/tokenizer,, not the parser, and
are just stripped out and thrown away. So the usual way to deal with this
sort of thing is to modify the lexer to recognize your "special" comments
and return keyword tokens for them. Then you just modify the grammar to
accept and deal with these extra keywords where appropriate.


Chris Dodd
cdodd@acm.org

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