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2,561 bytes added ,  06:33, 21 December 2017
+suppressed scripts;
-- put tables and their tables together
local function __coalesce(...)
local coalesced = {}
for _, langslist in ipairs{...} do
for langcode, langnames in pairs(langslist) do
for _, langname in pairs(langnames) do
if not coalesced[langcode] then
coalesced[langcode] = {}
end
table.insert(coalesced[langcode], langname)
end
end
end

return coalesced
end

-- make the keys lowercase
local function __preprocess(t, first_of_array_in_array)
local preprocessed = {}
if first_of_array_in_array then
-- keep only the 1st language name for each code, excluding synonyms
for k, v in pairs(t) do
preprocessed[k:lower()] = {v[1]}
end
else
for k, v in pairs(t) do
preprocessed[k:lower()] = v
end
end

return preprocessed
end

-- all valid primary language subtags for BCP47 from IANA (most of them from ISO 639-1, -2 and -3 with some exclusions)
local __iana_languages = __preprocess(require("Module:Language/data/iana languages"));
-- ISO 639-3 contains additional 3-letter codes not inserted in the IANA database as they are aliased to 2-letter codes,
-- but excludes some deleted codes still valid in BCP47 (some of them are aliased)
local __iso_639_3 = __preprocess(require("Module:Language/data/ISO 639-3"));
-- Wikimedia wikis uses some non-standard codes and a subset of IANA codes, plus composite codes
local __wp_languages = __preprocess(require("Module:Language/data/wp languages"), true);
-- all valid script subtags for BCP47 from IANA (excluding special ISO 15924 codes)
local iana_scripts = __preprocess(require("Module:Language/data/iana scripts"));
-- all valid region subtags for BCP47 from IANA (derived from ISO 3166-1 excluding special codes, and from 3-digit UN M.49 codes for groups of countries)
local iana_regions = __preprocess(require("Module:Language/data/iana regions"));

-- variant subtags from IANA; table format differs from the other IANA data tables
local iana_variants = __preprocess(require("Module:Language/data/iana variants"));
-- suppressed script subtags from IANA;
local iana_suppressed_scripts = __preprocess (require("Module:Language/data/iana suppressed scripts"));

return {
lang = __coalesce(__wp_languages, __iana_languages, __iso_639_3),
lang_iana = __iana_languages,
script = iana_scripts,
region = iana_regions,
variant = iana_variants,
suppressed = iana_suppressed_scripts,
}

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