[luatex] emulating \XeTeXglyph

[Janusz S. Bień]

On Sun, Nov 03 2024 at 14:55 +01, Janusz S. Bień wrote:
> On Sun, Nov 03 2024 at 13:52 GMT, David Carlisle wrote:
>> it's essentially the same code as you used (Henri provided both)
>> sorry no time now, and I don't have the font but you are free to compare the versions and see if Henri changed anything in each version.
>
> OK.
>
> Does anybody on this list have an idea why the emulation fails only for
> one specific font slot?
>
> Regards - Janusz
>
>>
>> David
>>
>> On Sun, 3 Nov 2024 at 13:33, Janusz S. Bień <jsbien at mimuw.edu.pl> wrote:
>>
>>  On Sun, Nov 03 2024 at 13:19 GMT, David Carlisle wrote:
>>  > your question isn't very clear (what emulation isn't working?)
>>
>>  Thanks for you answer!
>>
>>  From the source code of the sample files at https://github.com/jsbien/tmpLuaLaTeX:
>>
>>  % Karl Berry
>>  % Production notes
>>  % TUGboat volume 44, number 1 (2023), page 115
>>  % https://tug.org/TUGboat/tb44-1/tb136prod.pdf
>>  % DOI (this page): 10.47397/tb/44-1/tb136prod
>>  % a bit of Lua code which written by Henri Menke
>>  % (thank you Henri, and thank you search engines), which emulates many
>>  % \XeTeX\ primitives in Lua\TeX\
>>  % (\url{https://gist.github.com/hmenke/6e8ff7c90a5e5df3c4895f60059a2ef7}):
>>
>>  The actual code is
>>
>>  \def\XeTeXglyph{%
>>     \directlua{
>>        local index = token.scan_int()
>>        local tfmdata = font.getfont(font.current())
>>        if tfmdata.format ~= "opentype" and tfmdata.format ~= "truetype" then
>>           tex.error("Cannot use \\XeTeXglyph with " .. tfmdata.name .. " format " .. tfmdata.format)
>>        end
>>        local found = false
>>        for slot, char in pairs(tfmdata.characters) do
>>           if char.index == index then
>>              tex.print(utf.char(char.unicode))
>>              found = true
>>              break
>>           end
>>        end
>>        if not found then
>>           texio.write_nl("Glyph " .. index .. " not found in " .. tfmdata.name)
>>        end
>>     }
>>   }
>>
>>  It works e.g. for \XeTeXglyph21188 but not for \XeTeXglyph16990. Both
>>  work in XeTeX, so it doesn't seem a font problem. The font is
>>  NishikiTeki-MVxaJ.ttf from
>>  https://www.fontspace.com/nishiki-teki-font-f86893.
>>
>>  > but there is a Lua emulation (not that well tested) for the xetex
>>  > glyph index commands available at
>>  > https://github.com/latex3/xxetex/blob/main/xxetex.lua#L81 and
>>  > surrounding code.
>>
>>  I will happy to test it, but I need some fool-proof instructions how to
>>  use it in LuaLaTeX.
>>
>>  Regards - Janusz
>>
>>  >
>>  > David
>>  >
>>  > On Sun, 3 Nov 2024 at 12:46, Janusz S. Bień <jsbien at mimuw.edu.pl> wrote:
>>  >
>>  >  Hi!
>>  >
>>  >  I have encountered a strange problem:
>>  >
>>  >  https://github.com/jsbien/tmpLuaLaTeX/issues
>>  >
>>  >  I can live with it, but perhaps it is a manifestation of some more
>>  >  interesting problem.
>>  >
>>  >  It's quite possible I'm doing something stupid... Anyway
>>  >  ChatGPT/AskTheCode was unable to help.
>>  >
>>  >  Best regards
>>  >
>>  >  Janusz
>>  >
>>  >  -- 
>>  >               ,   
>>  >  Janusz S. Bien
>>  >  emeryt (emeritus)
>>  >  https://sites.google.com/view/jsbien
>>  >
>>
>>  -- 
>>               ,   
>>  Janusz S. Bien
>>  emeryt (emeritus)
>>  https://sites.google.com/view/jsbien
>>

-- 
             ,   
Janusz S. Bien
emeryt (emeritus)
https://sites.google.com/view/jsbien