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Date: Fri, 07 Feb 2014 20:17:39 +0000
From: Joseph Wright <joseph.wright@morningstar2.co.uk>
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To: List team-latex <latex-team@latex-project.org>
Subject: Re: Lowercasing, etc. (again)
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[Sorry for the multiple messages: interesting and tricky problem!]

On 07/02/2014 19:41, Joseph Wright wrote:
> I
> guess a comprehensive test will be needed, or I could use the list from
> Unicode to get Lua to do all of the case changes and then use that
> output for XeTeX: would be self-consistent at least.)
Definitely a better plan overall, and avoids having to do a mapping at 
point-of-use in XeTeX for the setup:

     \xetex_if_engine:TF
       {
         \group_begin:
           \etex_everyeof:D { \exp_not:N }
           \tl_const:Nx \c__tl_act_lowercase_tl
             { \tex_input:D l3case-lower.def \c_space_tl }
           \tl_const:Nx \c__tl_act_uppercase_tl
             { \tex_input:D l3case-upper.def \c_space_tl }
         \group_end:
       }

with something like

\cs_new_protected:Npn \__kernel_read_case_data_aux:nn #1#2
   {
     \tl_rescan:nn
       { }
       {
         \iow_now:Nx \g_lower_stream
           {
             \luatexUchar "#1 \c_space_tl
             \lua_now_x:n
               {
                 tex.sprint
                   (
                      unicode["utf8"].lower
                      ( " \luatexUchar "#1 ~ " )
                   )
               }
           }
         \iow_now:Nx \g_upper_stream
           {
             \luatexUchar "#2 \c_space_tl
             \lua_now_x:n
               {
                 tex.sprint
                   (
                      unicode["utf8"].upper
                      ( " \luatexUchar "#2 ~ " )
                   )
               }
           }
       }
   }

in the 'setup' script (I renamed the streams so I can keep a track of 
things).

Joseph
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