Модул:Cans-translit

local export = {}
-- to be discussed: not to create this module, but create individual modules instead?

local UTF8_char = "[%z\1-\127\194-\244][\128-\191]*"
	
local function iter_char(str)
	return string.gmatch(str, UTF8_char)
end

local function len(str)
	local _, length = string.gsub(str, UTF8_char, "")
	return length
end

local function fetch(str, index)
	local i = 0
	for char in iter_char(str) do
		i = i + 1
		if i == index then
			return char
		end
	end
	return ""
end

function export.tr(text, lang, sc)
	local data = {
		{ --short-vowel
			"ᐁᐃᐅᐊᐯᐱᐳᐸᑌᑎᑐᑕᑫᑭᑯᑲᒉᒋᒍᒐᒣᒥᒧᒪᓀᓂᓄᓇᓭᓯᓱᓴᔦᔨᔪᔭᖊᖋᖌᖍᕃᕆᕈᕍᕂᕄᕊᕋᔐᔑᔓᔕᕓᕕᕗᕙᕞᕠᕤᕦᘚᘛᘕᘔᓓᓕᓗᓚᙯᕿᖁᖃᙰᖏᖑᖓ ᙱᙳᙵᕴᕵᕷᕹ",
			"1ptkcmnsyrrršfðzlq23h",
			{"","ng","nng"},
			"eioa",
			function(a,b)
				return a..b
			end
		},
		{ --w
			"ᐌᐍᐎᐏᐒᐓᐗᐘᐺᐻᐼᐽᑀᑁᑄᑅᑗᑘᑙᑚᑝᑞᑡᑢᑴᑵᑶᑷᑺᑻᑾᑿᒒᒓᒔᒕᒘᒙᒜᒝᒬᒭᒮᒯᒲᒳᒶᒷ"
				.. "ᓉᓊ  ᓋᓌ  ᓶᓷᓸᓹᓼᓽᔀᔁᔯᔰᔱᔲᔵᔶᔹᔺᔗᔘᔙᔚᔝᔞᔡᔢᓜᓝᓞᓟᓢᓣᓦᓧ",
			"1ptkcmnsyrz",
			{""},
			"eeiiooaa",
			function(a,b)
				return a..'w'..b
			end
		},
		{ --long-vowel
			"ᐄᐆᐋᐲᐴᐹᑏᑑᑖᑮᑰᑳᒌᒎᒑᒦᒨᒫᓃᓅᓈᓰᓲᓵᔩᔫᔮᕇᕉᕌᔒᔔᔖᕖᕘᕚᕢᕥᕧᓖᓘᓛᐐᐔᐙᖀᖂᖄᕶᕸᕺ",
			"1ptkcmnsyršfðlwqh",
			{""},
			"īōā",
			function(a,b)
				return a..b
			end
		},
		{ --w-long
			"ᐐᐑᐔᐕᐖᐙᐚᐛᐾᐿᑂᑃ ᑆᑇᑈᑛᑜᑟᑠ ᑣᑤᑥᑸᑹᑼᑽ ᒀᒁᒂᒖᒗᒚᒛ ᒞᒟᒠᒰᒱᒴᒵ ᒸᒹᒺ     ᓍᓎᓏ"
				.. "ᓠᓡᓤᓥ ᓨᓩ ᓺᓻᓾᓿ ᔂᔃᔄᔛᔜᔟᔠ ᔣᔤ ᔳᔴᔷᔸ ᔻᔼᔽ     ᕎᕏ      ᕛᕜ      ᕨᕩ ",
			"1ptkcmnlsšyrfð",
			{""},
			"īīōōōāāā",
			function(a,b)
				return a..'w'..b
			end
		},
		{ --individual
			"ᑊᐟᐠᐨᒼᐣᐢᐧᐤᐦᕁᕽᓫᕑᑉᑦᒡᒃᒻᓐᔅᔥᔾᓪᕐᕪ‡ᒄᔉᖅᖕᖖᕝᖦᕀᕻᕼ",
			"ptkcmnsywh11lrptckmnsšylrðð23q45vlyhh",
			{"hk","kw","sk","ng","nng"},
		},
	}
	
	for i, item in pairs(data) do
		if item[4] then
			local length = len(item[4])
			local c = 0
			for s in iter_char(item[1]) do
				c = c + 1
				local index = math.ceil(c / length)
				local a = fetch(item[2], index)
				if tonumber(a) then
					a = item[3][tonumber(a)]
				end
				index = (c - 1) % length + 1
				local b = fetch(item[4], index)
				if s ~= " " then
					text = string.gsub(text, s, item[5](a,b))
				end
			end
		else
			local iter1, iter2 = iter_char(item[1]), iter_char(item[2])
			while true do
				local s, a = iter1(), iter2()
				if not (s and a) then
					break
				end
				if tonumber(a) then
					a = item[3][tonumber(a)]
				end
				text = string.gsub(text, s, a)
			end
		end
	end
	return text
end

return export