From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
To: guile-devel <guile-devel@gnu.org>
Subject: scheme printer in scheme
Date: Sat, 14 May 2022 00:58:35 +0200 [thread overview]
Message-ID: <CAGua6m3oSuFz-wHfT_p5fARV6rWW3bZPrt-BcH90g4esVddq7Q@mail.gmail.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 1750 bytes --]
Hi!
I have managed to code a printer in scheme that is suspendable e.g. no
jumping back and forth between scheme and C unless you use custom old port
p printers or smob printers. This system also works nicely with a soft port
construction I have that is completely written in scheme. So when one using
the soft-suspendable-ports discussed in
http://itampe.com/suspendable-soft-ports.html it all works as well for
format, display and write. As this is a pure scheme library solution there
is no C interface that takes advantage of this system with more
than that one trampolines into scheme and use the scheme write,display and
format. This is a proof of concept and not finished yet although more
advanced objects like smob and ports with custom printers works as it
should. Internals from the C implementation are used so older versions of
guile may be buggy. The simple complex objects like struct and classes is a
bit easier to maintain as their custom printers is scheme printers.
objects not handled:
(array )
(bitvector)
(flags )
(stringbuf)
(values )
(program)
(pointer )
(weak-set)
(weak-table)
(dynamic-state)
(frame )
(atomic-box)
(cont )
(wvect )
I do not expect any problems with those compared to what objects are
already implemented.
Speedwise nothing is optimized. After a working module is finished we can
work on speeding things up like a lookup-table for the tc7 dispatch and so
on.
Usage:
(use-modules (ice-9 soft-suspendable-ports))
(install-soft-suspendable-ports!)
and you are ready to go with the repl now directly using the scheme printer
instead of the C based printer. Likwise format in the shell will now use
the scheme based printer.
Happy hacking
[-- Attachment #2: Type: text/html, Size: 2199 bytes --]
reply other threads:[~2022-05-13 22:58 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAGua6m3oSuFz-wHfT_p5fARV6rWW3bZPrt-BcH90g4esVddq7Q@mail.gmail.com \
--to=stefan.itampe@gmail.com \
--cc=guile-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).