[XeTeX] Long dash "--" in Latex
musaf at runbox.com
Fri Jul 2 03:56:52 CEST 2004
It seems beneficial to provide some sort of compatibility for some of
the more common LaTeX ligatures, such as `, ``, ', '', -, --, and ---.
On 2 Jul 2004, at 04:01, Jonathan Kew wrote:
> On 1 Jul 2004, at 5:01 pm, ชนพ ศิลปอนันต์ wrote:
>> -- and --- are ligatures; they are converted to en-dash and em-dash
>> respectively by ligature rules in traditional TeX's way. Therefore,
>> are not available in XeTeX.
> Right; or, to be more specific, they're handled by ligature rules in
> the TFM files of the Computer Modern fonts (and many other fonts for
> which TFMs have been created). They'll work just the same in XeTeX
> *if* you're using such fonts.
> But if you're using AAT or OpenType fonts *without* TFM files--the
> capability which is the major "selling point" of XeTeX--then access to
> any ligatures is dependent on ligature rules encoded in the AAT or OT
> tables of the font you're using. And -- and --- are not normally
> implemented there.
> On the other hand, you can simply use the Unicode en-dash and em-dash
> characters directly in your source text.
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