Re: How to handle comment using lex/yacc?

a7244270@yahoo.com (Alfonso Urdaneta)
16 Jan 2004 22:23:49 -0500

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How to handle comment using lex/yacc? cylin@avant.com.tw (cylin) (2004-01-09)
Re: How to handle comment using lex/yacc? a7244270@yahoo.com (2004-01-16)
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From: a7244270@yahoo.com (Alfonso Urdaneta)
Newsgroups: comp.compilers
Date: 16 Jan 2004 22:23:49 -0500
Organization: http://groups.google.com
References: 04-01-040
Keywords: yacc, parse
Posted-Date: 16 Jan 2004 22:23:49 EST

> When I parse this text file,the first line always is right,
> but the second line ayways gets syntax error.
> How to fix my lex and yacc file?? Thx.


... snip....


> top_rule:
> | slice_rule {ignoreComment('\n');}
> ;


It hasn't got anything to do with the comment - it's failing because
according to your grammar, only a single line of input is valid.


top_rule: slice_rule
        | top_rule slice_rule
        ;


The above will work for you (I think, didn't test), but its a little
different from what's in the manual's first sample , which looks kind
of like so:


input: /* empty */
        | input line
        ;


line: /* put your stuff here */
        | /* some more stuff */
          ;




Regards,


--
alfonso e. urdaneta

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