Re: re-entrant CAMLYACC parsers?

Date: Fri Aug 13 1999 - 23:18:57 MET DST

Message-Id: <>
Subject: Re: re-entrant CAMLYACC parsers?
Date: Fri, 13 Aug 1999 17:18:57 -0400

How amusing! I'm hacking an XML parser in CAML, too!

It sure was easy!

I ended up hacking caml-yacc to do it -- added a slot in the
parser_env, and a method to fetch the slot in parser actions.

>>>>> "GS" == Gerd Stolpmann <> writes:

    GS> On Tue, 03 Aug 1999, wrote:
>> How do most people implement re-entrancy in caml-yacc parsers
>> which must manipulate side-state? E.g., if I want to have some
>> hashtable to store a mapping from name to right-hand-side,
>> which the lexer will expand dynamically and push back onto the
>> lexbuf (I've enclosed the code I use to do that -- it looks
>> right, and it works, but I'm not certain that I got the
>> semantics of Lexing.lexbuf down), it'd be nice to store that
>> someplace on the stack, so that I don't have to count on
>> serialization of calls to the parser.
>> I've thought about hacking Parsing to have an extra slot in the
>> parsing_env record, of polymorphic type, and then adding some
>> syntax to the caml-yacc language to fetch that value.
>> Anybody done anything like this?
    GS> I had recently the same problem for my XML parser (BTW: will
    GS> be available soon). The idea is simple: make the parser an
    GS> object!

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