[XeTeX] xltxtra wishlist

[Dongsheng Song]

Thanks. I'm new to Tex, Could you give me a sample?

2007/5/30, Jjgod Jiang <gzjjgod at gmail.com>:
> Hi Dongsheng,
>
> I believe Miyata Shigeru has been working on this feature for a long time
> and it will be released with the next version of XeTeX (0.998).
>
> In general, I can tell you that Jonathan Kew decided font fallback (which
> you demonstrated) is not a good way for typesetting software (while it may
> be good for web browsers like Firefox), to have full control on all the
> typesetting behaviors, we must assign a "XeTeX character class" to all the
> characters in Unicode, for example,
>
>     \chardef\@@jop=4
>     \@for\Punct:={`',`",`（,`〔,`［,`｛,`〈,`《,`「,`『,`【}\do{\XeTeXcharclass\Punct=\@@jop}
>
> can assign all these characters to charclass 4. Then, XeTeX allow us to
> specify some control sequences between two charclasses:
>
>     \chardef\@@nchar=0
>     \chardef\@@ideog=1
>     \XeTeXinterchartoks\@@nchar\@@ideog = {\bJap}
>
> This code means we need to execute \bJap command between "normal character"
> and "ideograph character", so that we can use \bJap command to switch font.
>
>     \XeTeXinterchartoks\@@ideog\@@nchar = {\eJap}
>
> And here, we switched font back for normal characters.
>
> It is, of course, a little bit more complicated than font fallback mechanism,
> but it allows us to control space between many possiblities.
>
> And you don't need to bother assigning XeTeXcharclass to those CJK characters
> we use daily (including all the Chinese characters), they are automatically
> assigned charclass 1 (ideograph) in XeTeX format file.
>
> - Jiang
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