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Regarding object query langugages, you might look at the CORBA system. As an object request broker, it needs to be fast, so the syntax is pretty simple. Of course, it may be too low level, but will give you ideas.

With regard to parsing, I would first create a grammar. I find Parse::RecDescent too slow when speed is of the essence. Writing your own top-down parser should speed things up and for a small grammar, it should be be easy to maintain as well.

Top-down parsers are constructed from a grammar as follows:

  • Each nonterminal in your grammar becomes a subroutine that you call
  • Alternation '|' is handled with if-then statments
  • Qunatifiers like '*' and '+' are handled with loops
  • Nonterminal strings are matched using regexes.
For learning about parsing and translation, I recommend the dragon book: Compilers, by Aho, Sethi, and Ullman.

-Mark


In reply to Re: Object Query Languages and Parsers by kvale
in thread Object Query Languages and Parsers by TedYoung

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    [Tanktalus]: curious, then, why the reader works :)
    [Tanktalus]: or posting the last hour of cb... well, maybe I should double check that first :)
    [Tanktalus]: yup, it's working. :)
    [choroba]: https://github. com/choroba/pm-cb/ commit/7b57f513596 7bf8a29d74f1c307de 9a76894cdcf
    [choroba]: Also, a thread here on PM mentioned that one of perlmonks.com or www.perlmonks.com should now work
    [choroba]: Tidings
    [Tanktalus]: So, I can log in, I can update last hour of cb, I can read the cb, I just can't post a message to it :(

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