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Integration of lalr-scm


From: Ludovic Courtès
Subject: Integration of lalr-scm
Date: Tue, 30 Mar 2010 01:24:16 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Hello,

The ‘wip-lalr’ branch aims to integrate Boucher’s lalr-scm
<http://code.google.com/p/lalr-scm/> as a documented Guile module named
(system base lalr).

I’ve (apparently) been able to adapt the ECMAScript lexer and parser to
the new API without too much work.  The main API differences compared to
the old version found as (text parse-lalr) in Guile-Lib are:

  - There are now first-class ‘lexical-token’ objects (records), so
    lexers are required to use ‘make-lexical-token’ instead of ‘cons’,
    which improves clarity.

  - There are also first-class ‘source-location’ objects, whereas there
    wasn’t anything like that before.

  - Generated parsers are stateful, so one must instantiate a new one
    whenever parsing anew.

Unless someone objects, I’ll merge it one of these days.

Thanks,
Ludo’.





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