Help withh yacc date parser

"Davide Rizzo" <belgioioso@libero.it>
6 Feb 2003 00:05:47 -0500

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Help withh yacc date parser belgioioso@libero.it (Davide Rizzo) (2003-02-06)
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From: "Davide Rizzo" <belgioioso@libero.it>
Newsgroups: comp.compilers
Date: 6 Feb 2003 00:05:47 -0500
Organization: [Infostrada]
Keywords: yacc, parse, question
Posted-Date: 06 Feb 2003 00:05:47 EST

I need to define some Bison rules to match an arbitrary sequence of date and
time specification eg:
"monday 13 18:45 and 19:30", "sunday 19 and december 1st 2003 19:45 and
20:45" etc.
To avoid the great amount of reduce/reduce conflicts I get defining each
rule in a recursive manner, I tried something like:


note: object date_time_specifications
    | date_time_specifications object
    ;




date_time_specifications: date_specification
                | time_specification
                | date_time_specifications date_specification
                | date_time_specifications time_specification
                | date_time_specifications _AND date_specification
                | date_time_specifications _AND time_specification
                ;




date_specification: date_specification dates
                | date_specification _AND dates
                | date_specification date_intervals
                | date_specification _AND date_intervals
                | date_specification dates _AND date_intervals
                | date_specification date_intervals _AND dates
                ;


dates: date
        | dates date
        ;


date: implicit_specified_date
        | only_month
        | day_and_month
        | fully_specified_date
        ;




I would like to know (before defining action rules) if you think this
could work well
thanks, regards
Davide Rizzo
reply at belgioioso@libero.it

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