[luatex] setting lccode "automatically"

[Philipp Stephani]

Am 23.06.2011 um 12:35 schrieb Taco Hoekwater:

> 
>> 
>> No, and even without those local-dependent cases, it would still be
>> impossible to build a correct lccode/uccode table since
>> lowercasing/uppercasing one character is context-dependent and can
>> result in more than one character: the uppercase of ß is SS.
> 
> Well, in this particular example, there is ... U+1E9E ! :) :)

No, the capital ß is not the uppercase version of ß. SpecialCasing.txt has

# The German es-zed is special--the normal mapping is to SS.
# Note: the titlecase should never occur in practice. It is equal to titlecase(uppercase(<es-zed>))

00DF; 00DF; 0053 0073; 0053 0053; # LATIN SMALL LETTER SHARP S

>> LuaTeX might implement the casing
>> algorithms (with tailoring) described in section 3.13 of the
>> standard. 
> 
> You do not happen to be bored and looking for something interesting
> to do in the coming few weeks, by any chance?

The casing algorithms are already implemented in the ICU library (and probably in other libraries as well).