[luatex] How to query fonts.handlers

[Henri Menke]

Yes, but the other code also works in ConTeXt.  The usage of table.keys
is actually not necessary and just masked the fact that lookupcache in
plain LuaTeX is nil.

\startluacode
fonts.handlers.otf.addfeature {
    name = "ktest",
    type = "kern",
    data = {
        ["t"] = { ["e"] = 500 },
    }
}
\stopluacode

\definefontfeature[ktest][ktest=yes]

\definefont[1][Serif*ktest]

\starttext

\1 test \ctxlua{
     local fnt = font.current()
     local tfmdata = fonts.hashes.identifiers[fnt]
     local t = string.byte("t")
     local e = string.byte("e")
     local kern = 0
     for kind in pairs(tfmdata.shared.rawdata.lookupcache) do
         kern = kern + fonts.handlers.otf.getkern(tfmdata,t,e,kind)
     end
     context(kern / tfmdata.parameters.factor) % 500
}

\stoptext


On 7/02/19 12:03 AM, Ulrike Fischer wrote:
> Am Wed, 6 Feb 2019 22:01:24 +1300 schrieb Henri Menke:
> 
>>    for kind in pairs(tfmdata.shared.rawdata.lookupcache) do
> 
> Your context code used
> 
> for _,kind in pairs(table.keys(tfmdata.shared.rawdata.lookupcache))
> do
>