[XeTeX] emdash and endash

[David Carlisle]

On 18 February 2017 at 09:45, Zdenek Wagner <zdenek.wagner at gmail.com> wrote:
> No, -- and --- are handled by tfm in traditional TeX, in XeTeX it is handled
> by the teckit mapping. The keywords are either Mapping=tex-text or
> Ligatures=TeX. I have not examined the packages in depth but it may be added
> automaticaly. The mapping is defined in file
> texmf-dist/fonts/misc/xetex/fontmapping/base/tex-text.map (*.map is compiled
> to *.tec by teckit-compile).
>
>

As I said, it is handled by the mapping file (which is applied by
default if the font is loaded via fontspec)
but if classic fonts are being used then this is a feature of the tfm
(even in xetex, not just in traditional tex)
so it depends what fonts the OP is using in the document.

David