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re-entrant CAMLYACC parsers?
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Date: -- (:)
From: chet@w...
Subject: Re: re-entrant CAMLYACC parsers?

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.

--chet--
>>>>> "GS" == Gerd Stolpmann <Gerd.Stolpmann@darmstadt.netsurf.de> writes:

    GS> On Tue, 03 Aug 1999, chet@watson.ibm.com 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!