[XeTeX] Hyphenation of "--" with tex-text mapping on

[Bruno Voisin]

Le 5 nov. 05 à 03:27, Jonathan Kew a écrit :

> It's a known limitation of using the font mapping mechanism to  
> simulate this legacy TeX convention. (Well, it was known to me,  
> anyhow! But I don't think it's been discussed previously.) You'll  
> find em-dashes entered as --- are similarly vulnerable.
>
> [...]
>
> When writing for TUGboat recently, I noted that the proper style  
> there involves use of a \Dash macro, rather than ---, as the way to  
> generate a dash. Doing something like this makes it easy to ensure  
> the proper behavior in both legacy and Unicode cases; I used a  
> XeTeX-friendly Unicode definition of \Dash in my document in order  
> to avoid this precise issue.

A late follow-up to this thread: I've just realized that, in LaTeX  
2e, the recommended way of entering en- and em-dashes is through the  
commands \textendash and \textemdash. That solves the above problem  
(like the \Dash macro you used with plain TeX, I guess).

Another advantage: if an en-dash is entered in this way in a section  
title, and the hyperref package is used to create bookmarks, then the  
en-dash will appear as en-dash in the bookmarks; otherwise, if  
entered as a ligature --, then it would show up as -- in the  
bookmarks. That's what happens with the xunicode.sty package loaded,  
anyway. And no need, in this way, to use the low-level hyperref  
command \texorpdfstring, which is the solution I was contemplating.

Bruno Voisin