Re: [emacs-bidi] status? news?

[Eli Zaretskii]

On Mon, 5 Feb 2001, Behdad Esfahbod wrote:

> On Mon, 5 Feb 2001, Eli Zaretskii wrote:
> 
> > > Date: Sun, 21 Jan 2001 17:37:21 +0330 (IRT)
> > > From: Roozbeh Pournader <address@hidden>
> > >
> > > On Sun, 21 Jan 2001, Eli Zaretskii wrote:
> > >
> > > > Could you please elaborate on these problems with next text lines?
> > >
> > > With implicit bidi support (with LRM and RLM, but without LRE, RLE,
> > > LRO, RLO, and PDF), you can first break the lines, and then apply bidi to
> > > each line separately for reordering before the display.
> > >
> > > With explicit support, you should first do bidi on the whole paragraph,
> > > then break the lines, and finally reorder the text. This is considered
> > > hard to do in many applications.
> >
> > Nevertheless, the Unicode algorithm specifically says that
> > line-breaking should happen _before_ reordering.  Is that a bug in
> > UTR9?
> 
> I Don't think so, in the "Reordering Resolved Levels" of UTR9 it says:
> "
> Logically there are the following steps:
> ...
> o  the accumulated widths of those glyphs (in logical order) are used
>    to determine line breaks.
> o  for each line, rules L1-L4 are used to reorder the characters on
>    that line.
> ...
> "

Precisely!  This says that you determine line breaks by accumulating the 
glyph widths _in_logical_order_, and only after that reorder the 
characters on each line into the visual order.

This seems to contradict what Roozbeh said in the message to which I 
replied, see the quotations above.

Am I missing something?