> Date: Sun, 5 Apr 2015 11:20:41 +0300 > From: Dov Grobgeld <dov.grobg...@gmail.com> > Cc: "Nadav Har'El" <n...@math.technion.ac.il>, Dotan Cohen > <dotanco...@gmail.com>, > linux-il <linux-il@cs.huji.ac.il> > > I admit that I have very little knowledge about how font selection and > reordering logic works in emacs.
Font selection has absolutely no bearing on this discussion. The visual order is decided based on the characters' properties, not on how they will be drawn on the glass. For example, they will be reordered even if they have no glyphs in any available font, or if you set up a display table to, say, display Hebrew letters as upper-case Latin letters. As to reordering, it happens at display time. The mechanism that generates data structures used to draw font glyphs on the screen produces visual order from the logical order, so that those data structures hold the text already reordered. > One way of carrying out reordering of <h1>שלום!</h1> would be if the emacs > major mode was be able to inject the FSI...PDI characters before the text is > passed to the paragraph direction determining logic. Is this possible? No. The logic that determines base paragraph direction is part of the reordering code which produces visual order from logical order. That code runs as part of redisplay, and examines only the text that is in the buffer. So the FSI..PDI embeddings must be present in buffer text to do what you want. If something like what you want is required without changing buffer text, there could be special text properties on some portions of buffer text, that would be interpreted by the display code. But that isn't implemented, mainly because no one expressed any special interest in that, let alone presented a worked-out set of requirements for it. _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
