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Martin Harvey (Demon Acco
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 Posted: Mon Feb 07, 2005 12:41 am Post subject: Streaming systems: CoCo/R rocks! |
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Hey folks,
Thanks for previous feedback concerning my comments on object
streaming systems. I've spent this weekend evaluating CoCo/R (a lexer
and parser generator) for Delphi.
I'm pleased to say, it rocks! Since it generates a recursive descent
parser (not a table driven one) it's much easier to understand than
those generated with TP Lex/Yacc. Additionally, the Delphi specific
extensions and default code template mean that it's nicely OO
encapsulated and works with streams. All in all, a nice piece of kit,
and with it, it's going to be very easy to construct what I need.
Right - time to crack on with my intermediate object representation
:-)
MH.
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mamcx
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Martin Harvey (Demon Acco
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| Posted: Fri Feb 11, 2005 11:58 pm Post subject: Re: Streaming systems: CoCo/R rocks! |
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On Fri, 11 Feb 2005 10:43:53 -0500, mamcx <thismail (AT) notexist (DOT) com>
wrote:
Well, there are 2 issues:
1. It's not Java ... it looks like the input to a Java version of
LEX/YACC.
2. Unfortunately, I don't think so, because your grammar includes:
LOOKAHEAD(2), and I suspect CoCo/R only translates LL(1) grammars.
Having said that, you could work your way around it, but it requires
an understanding of parser design.
I suggest you get an EBNF description of the grammar (which you can
cut out of that file), and then start from scratch.
MH.
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mamcx
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| Posted: Tue Feb 15, 2005 2:02 pm Post subject: Re: Streaming systems: CoCo/R rocks! |
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| Quote: | I suggest you get an EBNF description of the grammar (which you can
cut out of that file), and then start from scratch.
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Ok, so how understand it? How "code" it? I read a lot this days but not
can get it... i not found a simple step-by-step guide... so I tink in
build this using regular expressions....
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Martin Harvey (Demon Acco
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| Posted: Tue Feb 15, 2005 11:27 pm Post subject: Re: Streaming systems: CoCo/R rocks! |
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On Tue, 15 Feb 2005 09:02:45 -0500, mamcx <thismail (AT) notexist (DOT) com>
wrote:
| Quote: | Ok, so how understand it? How "code" it? I read a lot this days but not
can get it... i not found a simple step-by-step guide... so I tink in
build this using regular expressions....
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I'd suggest that instead of using that parser (which is *not* simple
to understand), you get a description of the query language... i.e. a
specification, NOT code, and then download CoCo/R or TP lexx and Yacc,
and work through some examples.
e.g.: start out by writing a parser to parse arithmetic expressions,
like (1 + 2) * 3 and then work on from there.
MH.
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