[XeTeX] xunicode for maths

[Jonathan Kew]

On 20 Feb 2006, at 6:58 am, Will Robertson wrote:

>> Maybe I should extend \char so as to directly handle values up to  
>> "10FFFF, generating a pair of nodes when necessary, and similarly  
>> extend \XeTeXcharglyph to handle the same range.
>
> I think the unicode people would be mad at you for splitting their  
> encoding into two non-equal (in the eyes of \char) halves.

Maybe, though I suppose I could try to argue that \char is an  
internal detail of the implementation, and what users should work  
with would be a higher-level \USV command that does the Right Thing  
with whatever character code it's given. :)

However....

> It would be a good idea, I reckon, to have \char transparently deal  
> with unicode scalar values, even if XeTeX uses UTF-16 codes  
> internally to pass around data.

....I've just implemented this for 0.991 (coming soon): \char,  
\chardef, and \XeTeXcharglyph will accept character codes up to  
10FFFF. So you'll be able to throw away that \USV macro.

(Not in math mode yet, though--\mathchar is another matter.)

JK