From: Richard Wordingham <richard.wordingham@ntlworld.com>
To: help-gnu-emacs@gnu.org
Subject: Manually parsing char-tables
Date: Sun, 20 Feb 2022 11:09:26 +0000 [thread overview]
Message-ID: <20220220110926.25c675be@JRWUBU2> (raw)
I am trying to understand how Arabic script rendering works in Emacs
28.0.90, as it seems to be using a different mechanism to that used for
Indic or European scripts. (There seems to be more to it than just the
asymmetries between right-to-left and left-to-right.) To that end, I
am trying to understand the contents of the variable
composition-function-table.
When I use command describe-variable, the value shown starts out:
#^[nil nil nil nil
#^^[1 0
#^^[2 0 nil nil nil nil nil nil
#^^[3 768 #1=(["\\c.\\c^+" 1 compose-gstring-for-graphic]
[nil 0 compose-gstring-for-graphic])
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1#
#1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# #1# nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil]
nil nil
#^^[3 1152 nil nil nil #1# #1# #1# #1# #1# #1# #1# nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
nil nil nil]
(I've converted lines to paragraphs and abbreviated leading white
space.)
I'm guessing that #1# is a macro invocation; when I invoke (print
composition-function-table), I get something similar, but with #1#
expanded and the '#1=' in the apparent macro definition omitted.
Where is this syntax explained? I've looked in the elisp manual, but
not found it, though I may simply have failed to guess where such a
description was.
Richard.
next reply other threads:[~2022-02-20 11:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-20 11:09 Richard Wordingham [this message]
2022-02-20 12:50 ` Manually parsing char-tables Eli Zaretskii
2022-02-21 1:39 ` Richard Wordingham
2022-02-26 0:28 ` Composed Sequences (was: Manually parsing char-tables) Richard Wordingham
2022-02-26 6:33 ` Eli Zaretskii
2022-02-26 15:11 ` Composed Sequences Richard Wordingham
2022-02-26 15:35 ` Eli Zaretskii
2022-02-26 19:46 ` Richard Wordingham
2022-02-26 20:02 ` Eli Zaretskii
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/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220220110926.25c675be@JRWUBU2 \
--to=richard.wordingham@ntlworld.com \
--cc=help-gnu-emacs@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).