Module:ISO 639

require('strict')

local p = {}

local getArgs = require('Module:Arguments').getArgs
local warn = require('Module:Warning')

local realISO = require('Module:ISO_639_name')

--[=[
Get the language name, in English, for a given ISO 639 (-1, -2 or -3) code

Returns nil if the language is not in the lookup tables.
]=]
function p.language_name(code, failValue)
	-- Only continue if we get passed a non-empty string for the code param
	if code == nil or code == '' then
		warn('No ISO code provided to [[Module:ISO 639]]')
		return failValue
	elseif type(code) ~= 'string' then
		warn('ISO code \"' .. tostring(code) .. '\" is not a string')
		return failValue
	end
	
	local name, success = realISO._iso_639_code_to_name({ code, ['hide-err'] = 'yes' })

	if not success then
		warn('ISO code \"' .. code .. '\" not recognized by [[Module:ISO 639]]')
		return failValue
	end
	
	return name
end

return p