Parsers for Lisp - was: I don't understand Lisp
Axel Schairer
[snip opinion on `do we need regular expressions in CL?']
> since their [i.e. regular expressions' in CL] presence seem to
> supplant better solutions, like parsers that convert strings into
> data structures
[snip]
Agreed, I almost always parse the input (strings) and work on a more
structured representation. However I have not discovered `my' parser
generator yet.
Which parser generators do people use?
I have tried the following so far:
1) lex and bison (or yacc): Outputting strings to be read in by lisp.
This cannot be the ultimate solution for obvious reasons however.
2) zebu: As far as parser generation and parsing is concerned I liked
zebu (except perhaps for missing operator precedence). However, it
does not seem to be supported any more and the glue code (i.e. its
initialization code and package layout) are a bit unorthodox, it
seems to me (e.g. getting messages about `metagrammar not loaded',
where you don't even dream of using the metagrammar at runtime and
so on).
Any suggestions what I should have a look at? -- Thanks.
Axel
Rainer Joswig
<scha...@dfki.de> wrote:
> 2) zebu: As far as parser generation and parsing is concerned I liked
> zebu (except perhaps for missing operator precedence). However, it
> does not seem to be supported any more and the glue code (i.e. its
> initialization code and package layout) are a bit unorthodox, it
> seems to me (e.g. getting messages about `metagrammar not loaded',
> where you don't even dream of using the metagrammar at runtime and
> so on).
Is there a later version than
<ftp://ftp.digitool.com/pub/mcl/contrib/zebu-3.5.2.tgz> ?
Alexander Vorobiev
> Is there a later version than
> <ftp://ftp.digitool.com/pub/mcl/contrib/zebu-3.5.2.tgz> ?
ftp://ftp.cs.cmu.edu/user/ai/new/zebu-3.5.3.tgz
Alexander
Rainer Joswig
<spa...@sparrow.diamant.ru> wrote:
Oops! Thanks.
> Alexander
Looks like nobody is maintaining that server anymore?
Axel Schairer
jos...@lavielle.com (Rainer Joswig) writes:
> Is there a later version than
> <ftp://ftp.digitool.com/pub/mcl/contrib/zebu-3.5.2.tgz> ?
I don't know. When I needed a parser some time (months?) ago, I
browsed the CMU Artificial Intelligence Repository and found version
3.4.8. That's the one I was talking about. So maybe zebu is
supported and I just got the wrong person's email address when
suggesting our patches.
Axel
PS: This is the info taken from the CMU Artificial Intelligence Repository
---------
Version: 3.4.8 (8-MAR-96); 3.3.6 (30-AUG-94); 3.3.2 (28-JUL-94)
Ports: Tested in Lucid CL and Allegro CL under HP-UX, and MCL
2.0b on the Macintosh
Copying: Copyright (c) 1989 by William M. Wells III
Copyright (c) 1990-93 by Hewlett-Packard Company.
Use, copying, modification and distribution permitted
for non-commercial purposes. (See the file named
COPYRIGHT in the package for details.)
Updated: Thu Mar 7 17:25:22 1996
CD-ROM: Prime Time Freeware for AI, Issue 1-1
Bug Reports: lau...@hplabs.hpl.hp.com
Author(s): Joachim H. Laubsch
---------