Module:wmw-headword

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This module needs documentation.
Please document this module by describing its purpose and usage on the documentation page.

local export = {}

local lang = require("Module:languages").getByCode("wmw")

local plural_classes = {
	 = "c2",  = "c2",  = "c4",  = "c8",  = "c10",  = "c6",
	 = "c6",  = "c6",  = "c10"}

local plural_rules = {
		    = { = {"mwi",    "we", 4},  = {"mwa",    "wa", 4},  = {"mu",   "wa", 3},  = { "n",   "wa", 2}},
		   = { = {  "",   "wa", 1}},
		    = { = {"mwi",    "mi", 4},  = {"mw",    "my", 3},  = {"m",   "mi", 2},  = { "n",   "mi", 2}},
		    = { = {"", "ma", 1}},
		    = { = {"ki",   "vi", 3},  = {"ch", "vy", 3}},
		    = { = {"", "", 1}},
		    = { = {"", "ma", 1}},
		    = { = {  "lu",    "ma", 3}},
		  = { = {  "",  "ma", 1}},
}

function export.noun(frame)
	local params = {
		 = {required=true},
		 = {},
		 = {},
		 = {alias_of = "head"}
	}
	
	local args = require("Module:parameters").process(frame:getParent().args, params)
	
	local data = {lang = lang, pos_category = "nouns", categories = {}, heads = {args}, genders = mw.text.split(args, "%/"), inflections = {}}
	table.insert(data.categories, lang:getCanonicalName() .. " class " .. data.genders .. " nouns")
	
	local singular = args and require("Module:links").remove_links(args) or mw.title.getCurrentTitle().text
	local inflection = nil
	
	if not args then
		inflection = export.generate_plural(singular, args)
	else
		if (args ~= "-") then
			inflection = args	
		end
	end
	
	local accel = {form = "p"}
	if (plural_classes]) then
		accel.gender = plural_classes]
	end
	
	if (inflection) then
		table.insert(data.inflections, {label = "plural", accel = accel, inflection})
	end
	
	return require("Module:headword").full_headword(data)
	
end

function startswith(test_string, start)
	return mw.ustring.sub(mw.ustring.lower(test_string),1,mw.ustring.len(start))==mw.ustring.lower(start)
end

function match_case(string1, string2)
	c1 = mw.ustring.sub(string1, 1, 1)
	c2 = mw.ustring.sub(string2, 1, 1)
	if (mw.ustring.lower(c1) == c1) then
		return mw.ustring.lower(c2) .. mw.ustring.sub(string2, 2)
	end
	return mw.ustring.upper(c2).. mw.ustring.sub(string2, 2)
end

function export.generate_plural(singular, class)
	if (plural_rules) then
		for k,v in ipairs(plural_rules) do
			if startswith(singular, v) then
				return match_case(singular, v..mw.ustring.sub(singular, v))
			end
		end
	end
end

return export