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|
-----------------------------------------------------------------------
-- FILE: luaotfload-script.lua
-- DESCRIPTION: part of luaotfload / script
-----------------------------------------------------------------------
assert(luaotfload_module, "This is a part of luaotfload and should not be loaded independently") {
name = "luaotfload-script",
version = "3.20", --TAGVERSION
date = "2022-02-27", --TAGDATE
description = "luaotfload submodule / Script helpers",
license = "CC0 1.0 Universal",
author = "Marcel Krüger"
}
local canonical_name = {
dflt = "DFLT",
hira = "kana",
laoo = "lao",
yiii = "yi",
nkoo = "nko",
yaii = "vai",
["lao "] = "lao",
["yi "] = "yi",
["nko "] = "nko",
["vai "] = "vai",
}
local versioned_script = {
mym = "mymr", mymr = "mym",
bng = "beng", beng = "bng",
dev = "deva", deva = "dev",
gjr = "gujr", gujr = "gjr",
gur = "guru", guru = "gur",
knd = "knda", knda = "knd",
mlm = "mlym", mlym = "mlm",
ory = "orya", orya = "ory",
tml = "taml", taml = "tml",
tel = "telu", telu = "tel",
}
local function get_versioned(original)
local base = original:gsub("%d$", "") -- Strip any existing version
local versioned = versioned_script[base]
if not versioned then
return original
end
if #base == 3 then
local t = base
base = versioned
versioned = t
end
if base == "mymr" then
return "mym2", "mymr"
end
return versioned .. '3', versioned .. '2', base
end
-- We never return trailing spaces because I consider them implementation details.
local function script_to_ot(iso)
iso = iso:lower()
return get_versioned(canonical_name[iso] or iso)
end
local function script_to_iso(tag)
tag = tag:lower()
tag = canonical_name[tag] or tag
local stripped, did_strip = tag:gsub("%d$", "")
tag = did_strip == 1 and versioned_script[stripped] or tag
local tag_length = #tag
if tag_length == 4 then return tag end -- Optimization for common case
-- I promise you, I am not making this one up
return tag .. string.rep(tag:sub(tag_length, tag_length), 4-tag_length)
end
local function to_harfbuzz(script, language)
local otscript = script_to_iso(script)
-- if script_to_ot(otscript) == script then
-- return otscript, language
-- end
return otscript, "x-hbot" .. language .. "-hbsc" .. script
end
return {
to_harfbuzz = to_harfbuzz,
script = {
to_ot = script_to_ot,
to_iso = script_to_iso,
},
}
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