Arthur Reutenauer wrote:
> Hello Idris,
>
> I didn't see any reply to this e-mail you sent two weeks ago, so I
> wanted to give it a try:
>
>> In luatex can I make a definition such that such that the string
>>
>> U004C U0303 (l ̃)
>>
>> is always treated as l with tilde above, taking into account italics and
>> without using \~l (which does not work in, eg, footnote)?
>
> What you want here is to support the Unicode combining characters,
> which isn't straightforward in TeX because according to the Standard,
> they come after the base letter they modify,
Which is a fairly annoying syntax for our purpose.
> -- The following should check if we read ‘l’ and ‘combining tilde’
> -- consecutively. A lot of overhead; it would be much prettier to
> -- implement a finite automaton :-)
Thanks for the reminder. We have been thinking about creating an
lpeg variant that operates on tokens and/or nodes instead of
simple data strings, but that will take quite a bit of work.
It would be possible to simplify the loop logic by storing 'v' in
a local variable, so that t[] always lags behind one value:
function convert_combining(str)
local l, t = { }, { }
for _, v in ipairs(str) do
if v[2] == 0x0303 and l[2] == 0x6c then
t[#t+1] = token.create('buildtextaccent')
t[#t+1] = token.create('texttilde')
end
if l[2] then t[#t+1] = l end
l = v
end
if l[2] then t[#t+1] = l end
return t
end
Best wishes,
Taco
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