[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: display question: should ^N and \NNN widths be fixed?
From: |
Eli Zaretskii |
Subject: |
Re: display question: should ^N and \NNN widths be fixed? |
Date: |
Mon, 27 May 2002 10:33:13 +0300 (IDT) |
On 27 May 2002, Thien-Thi Nguyen wrote:
> The current code in indent.c assumes that buffer positions increase
> monotonically with screen positions. I'm not saying that you should do
> my job of lifting that limitation, but please keep this in mind when you
> design and code the new indent.c, so that changing it for bidi Emacs
> would not be harder than it is today.
>
> what makes it difficult to support this lifting, today?
Just a lot of coding ;-)
The problem is that with bidi display, the relationship between buffer
positions and screen positions is no longer a simple monotonically
increasing function. For example, if the buffer's contents is this:
abcABCdef
where upper-case letters stand for right-to-left characters, then it is
displayed as
abcCBAdef
and thus you cannot simply walk the buffer one character at a time and
add their display widths to compute the display column. For example, the
column of C is 3 (zero-based), not 5.
Again, I'm not saying you should solve this problem when you work on your
changes. I'm just asking to keep this at the back of your mind when you
make design decisions.
- Re: display question: should ^N and \NNN widths be fixed?, (continued)
- Re: display question: should ^N and \NNN widths be fixed?, Miles Bader, 2002/05/24
- Re: display question: should ^N and \NNN widths be fixed?, Thien-Thi Nguyen, 2002/05/25
- Re: display question: should ^N and \NNN widths be fixed?, Richard Stallman, 2002/05/26
- Re: display question: should ^N and \NNN widths be fixed?, Thien-Thi Nguyen, 2002/05/27
- Re: display question: should ^N and \NNN widths be fixed?, Richard Stallman, 2002/05/28
- Re: display question: should ^N and \NNN widths be fixed?, Eli Zaretskii, 2002/05/26
- Re: display question: should ^N and \NNN widths be fixed?, Thien-Thi Nguyen, 2002/05/27
- Re: display question: should ^N and \NNN widths be fixed?,
Eli Zaretskii <=