2009/6/18 Hans Hagen <pra...@wxs.nl>:
> Yanrui Li wrote:
>
>>> the cache option mentioned there is not meant for using, just for
>>> debugging
>>> (i.e. for myself)
>
>> I have printed the the shared descriptions with the following code
>> fragment:
>>
>> function f4zhcn.pre_linebreak_filter (head, groupcode)
>>   for t in node.traverse(head) do
>>      if is_cjk_ideo (t) then
>>     texio.write_nl ('*** CJK Ideo ***')
>>      elseif is_cjk_puncts (t) then
>>     texio.write_nl ('*** CJK Punct ***')
>>     for k in pairs(font.fonts[t.font]) do
>>        texio.write_nl (k)
>>     end
>>      end
>>   end
>>   return true
>> end
>>
>> With "fontdata.cache = 'no'", I just got:
>
> as we cache fonts at the lua end we don't want interference at the tex end
> (not duplicate table creation); the no tells luatex not to manage a cache at
> the tex end (i.e. no free not creation)
>
> the "no" tells luatex not to keep a reference to the table it gets passed
> and when you then use font.fonts it will recreate a table from the data at
> the tex end and descriptions (and of course all other extra that i create
> and manage at the lua end is not available)
>
> at the lua end you can use fonts.ids[id] instead and then you will get a
> descriptions (and leave the fontdata.cache key untouched unless you want to
> waste memory and runtime)
>

Ok, I see. many thanks!

> Hans
>
> ps. i will look into this bbox based compensation once we have a proper set
> of guaranteed correct standard cjk fonts in tex live and i've figured out a
> robust way to deal with it; i had code for it but threw it away out when i
> ran into conflicts with opentype features that do similar things and fonts
> that were inconsistent
>

I am just playing with luatex and learning it. Then I want to do
something for Chinese temporarily with Wolfgang's simplefonts module
because I need it for some documents of mine now.

-- 
Best regards,
Li Yanrui
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