Re: Greek in luatex

[Hans Hagen <pragma@wxs.nl>]

Thomas A. Schmitz wrote:
> OK, the message below didn't get too many responses, so maybe I can  
> rephrase my quiestions in a more precise manner:
> 
> 1. For otftotfm, there's the "unicoding" command where you can  
> replace a character in a certain slot with another unicode character,  
> so you could say
> unicoding "A = uni03D1"
> Is anything like this possible in luatex?

sure, but it depends a bit on what level ... font driven or not

if you have open type fonts, you can add features on the fly ...

\starttext

\installfontfeature[otf][verb]

\definefontfeature
   [test]
   [mode=node,language=dflt,script=latn,
    verb=yes,featurefile=verbose-digits.fea]

{\font\test=name:lmroman10regular*test at 20pt \test 1 2 3 4}

\ctxlua{characters.context.show(\number"00AB)}

\stoptext

this replaces 1 by one and 2 by two ...

the file verbose-digits.fea in in the distribution and an example of a 
fontforge specification file

> 2. I see this code in font-otf.lua:
> fonts.otf.features.data.tex = {
>      { "endash", "hyphen hyphen" },
>      { "emdash", "hyphen hyphen hyphen" },
>      { "quotedblleft", "quoteleft quoteleft" },
>      { "quotedblright", "quoteright quoteright" },
>      { "quotedblleft", "grave grave" },
>      { "quotedblright", "quotesingle quotesingle" },
>      { "quotedblbase", "comma comma" }
> }

that's ligatures and there for backward compatibility (hm, makes me 
wonder if it makes more sense to do that using feature files)

> and this list is used in the function function  
> fonts.initializers.base.otf.texligatures(tfm,value)
> 
> How is it possible to write a similar list and function for just a  
> single font or fonts in a specific typescript?

in principle you can add lua code in typescripts and then register that 
as a feature (so, texligatures or tlig is one of them, as is lineheight)

it all depends on how generic things are; we can think of features like 
remap=name-of-remap-vector (keep in mind that this operates on node 
lists then; rencoding the input i.e. regimes is done differently)

so .. just write down detailed specs -)

Han

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