From: Kenichi Handa <handa@m17n.org>
To: Kenichi Handa <handa@m17n.org>
Cc: emacs-bidi@gnu.org, emacs-devel@gnu.org
Subject: Re: Treatment of LRE,RLE,LRO,RLO,PDF,LRM,RLM
Date: Mon, 01 Nov 2010 17:15:13 +0900 [thread overview]
Message-ID: <tl7vd4hv4ry.fsf@m17n.org> (raw)
In-Reply-To: <tl7vd77z591.fsf@m17n.org> (message from Kenichi Handa on Thu, 19 Aug 2010 11:49:14 +0900)
In article <tl7vd77z591.fsf@m17n.org>, Kenichi Handa <handa@m17n.org> writes:
> I'd like to extend the elements of a display table.
> Currently only a glyph vector or nil is allowed. It seems
> good to extend it so that it can completely control the
> displaying of a character (like by face and display text
> properties).
> At least, for (2), I want to specify a space width (relative
> or absolute), and for (4) I want to specify a special form
> (list?) containing a mnemonic label.
I've just committed a basic infrastructure for displaying
non-graphic and no-font characters. For that, instead of
extending the current display table, I implemented a new
char table glyphless-char-display.
------------------------------------------------------------
Char-table to control displaying of glyphless characters.
Each element, if non-nil, is an ASCII acronym string (displayed in a box)
or one of these symbols:
hexa-code: display with hexadecimal character code in a box
empty-box: display with an empty box
thin-space: display with 1-pixel width space
zero-width: don't display
It has one extra slot to control the display of a character for which
no font is found. The value of the slot is `hexa-code' or `empty-box'.
The default is `empty-box'.
------------------------------------------------------------
It is easy to merge such functionality to a display table
later if we decide to do so.
But, there left these works.
(1) As it is not convenient for a user to specify each
element of glyphless-char-display, I made variables
char-acronym-table and glyphless-char-control. The
former is a simple char-table that contains acronym
strings. The latter is as this:
------------------------------------------------------------
glyphless-char-control is a variable defined in `characters.el'.
Its value is
((format-control . thin-space)
(no-font . hexa-code))
Documentation:
List of directives to control displaying of glyphless characters.
Each element has the form (TARGET . METHOD), where TARGET is a
symbol specifying the target character group to control, and
METHOD is a symbol specifying the method of displaying them.
TARGET must be one of these symbols:
`c0-control': U+0000..U+001F.
`c1-control': U+0080..U+009F.
`format-control': Characters of Unicode General Category `Cf'.
Ex: U+200C (ZWNJ), U+200E (LRM)), but don't include characters
that have graphic image such as U+00AD (SHY).
`no-font': characters for which no suitable font is found.
METHOD must be one of these symbols:
`zero-width': don't display.
`thin-space': display a thin space (1-pixel width).
`empty-box': display an empty box.
`acronym': display an acronum string in a box.
`hexa-code': display a hexadecimal character code in a box.
Just setting this variable does not take effect. Call the
function `update-glyphless-char-display' (which see) after
setting this variable.
------------------------------------------------------------
When acronum is specified, the function
update-glyphless-char-display sets elements in
glyphless-char-display to acronyms stored in
char-acronym-table.
Actually, glyphless-char-control should be a customizable
variable with proper set: function. But, I don't know how
to write the correct 'defcustom' form. Could someone DTRT?
(2) For Windows port:
I wrote x_draw_glyphless_glyph_string_foreground (in
w32term.c) by referring to x_draw_glyph_string_foreground in
the same file. But, it doesn't draw acronym nor hexa-code.
I couldn't figure out what is wrong. Please someone who
knows Windows code fix it.
(3) For mac port:
As I have no idea how to write a code for mac, the 'case
GLYPHLESS_GLYPH:' part in ns_draw_glyph_string (in nsterm.m)
is not finished. Please fill in the correct code by
referring to x_draw_glyph_string_foreground in xterm.c.
---
Kenichi Handa
handa@m17n.org
next prev parent reply other threads:[~2010-11-01 8:15 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tl7hbis1xop.fsf@m17n.org>
[not found] ` <AANLkTinrGPzGquxPmfigvZLzGbids39yU942sfwKGMYk@mail.gmail.com>
2010-08-19 2:49 ` [emacs-bidi] Treatment of LRE,RLE,LRO,RLO,PDF,LRM,RLM Kenichi Handa
2010-11-01 8:15 ` Kenichi Handa [this message]
2010-11-01 9:57 ` Eli Zaretskii
2010-11-01 11:16 ` Kenichi Handa
2010-11-13 13:51 ` [emacs-bidi] " Eli Zaretskii
2010-11-17 5:58 ` Kenichi Handa
2010-11-17 7:14 ` Kenichi Handa
2010-11-17 12:21 ` Eli Zaretskii
2010-11-17 19:20 ` Eli Zaretskii
2010-11-13 13:44 ` Eli Zaretskii
2010-11-13 14:07 ` Eli Zaretskii
2010-11-17 3:57 ` Kenichi Handa
2010-11-17 12:26 ` Eli Zaretskii
2010-11-17 12:55 ` Andreas Schwab
2010-11-17 13:24 ` Stefan Monnier
2010-11-18 20:07 ` Eli Zaretskii
2010-11-17 17:54 ` Eli Zaretskii
2010-11-17 23:59 ` Stefan Monnier
2010-11-18 20:04 ` Eli Zaretskii
2010-11-18 22:15 ` Stefan Monnier
2010-11-19 11:31 ` Eli Zaretskii
2010-11-20 15:06 ` Eli Zaretskii
2010-11-19 9:53 ` Andreas Schwab
2010-11-19 11:31 ` Eli Zaretskii
2010-11-19 11:47 ` Andreas Schwab
2010-11-17 19:39 ` Eli Zaretskii
2010-11-26 12:20 ` Eli Zaretskii
2010-11-26 12:29 ` Kenichi Handa
2010-11-27 8:42 ` Eli Zaretskii
2010-11-29 6:35 ` Kenichi Handa
2010-11-29 18:06 ` Stefan Monnier
2010-11-20 14:38 ` 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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=tl7vd4hv4ry.fsf@m17n.org \
--to=handa@m17n.org \
--cc=emacs-bidi@gnu.org \
--cc=emacs-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.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.