Module:snon-mut-decl

Documentation for this module may be created at Module:snon-mut-decl/doc

local export = {}

local yesno = require("Module:yesno")

local toNFC = mw.ustring.toNFC
local toNFD = mw.ustring.toNFD
local ulower = mw.ustring.lower
local umatch = mw.ustring.match
local usub = mw.ustring.sub

local GRAVE = "\204\128"

local lang = require("Module:languages").getByCode("cy")
local PAGENAME = mw.loadData("Module:headword/data").pagename
local MARKER = "<sup>△</sup>"

local mutation_rules = {
	["b"] = {"bb", "m", "bh"},
	["bh"] = {"b", "m", "gh"},
	["c"] = {"g", "ngh", "ch"},
	["ch"] = {"gh", "ngh"},
	["d"] = {"dd", "n", "dh"},
	["dh"] = {"d", "n", "gh"},
	["g"] = {"gg", "ng", "gh"},
	["h"] = {"gh", "nh", "ch"},
	["l"] = {"lh"},
	["m"] = {"mh"},
	["n"] = {"nh"},
	["p"] = {"b", "mh", "ph"},
	["ph"] = {"bh", "mh", "h"},
	["r"] = {"rr", "rh"},
	["s"] = {"z", "sh"},
	["t"] = {"d", "nh", "th"},
	["th"] = {"dh", "nh", "ch"},
}

function export.get_mutation_data(term)
	local data = {radical = term}
	
	local term_lower = term:gsub("^.[\128-\191]*", ulower) -- term with lowercase initial
	data.is_uppercase = term_lower ~= term
	local normalized = toNFD(term_lower)
	data.vowel = normalized:match("^[aeiouøy]") and true or false
	
	if data.vowel then
		data.final = term_lower
		data.mut1 = "gh-"
		data.mut2 = "n-"
		data.mut3 = "ch-"
		return data
	end
	
	local initial, final, mut
	for i = 3, 1, -1 do
		initial = usub(normalized, 1, i)
		mut = mutation_rules[initial]
		if mut then
			final = usub(normalized, i + 1)
			break
		elseif i == 1 then
			error(("no mutation rule found for %s"):format(term))
		end
	end
	
	if type(mut) == "table" then
		for k, v in pairs(mut) do
			if tonumber(k) then
				data["mut" .. k] = v
			end
		end
		data.colloquial = mut.colloquial
	end
	
	data.final = toNFC(final)
	
	return data
end

local function construct_mutation(data, accel_form, initial, override)
	local normal_mutation
	if not initial then
		normal_mutation = nil
	else
		normal_mutation = initial .. data.final
		if data.is_uppercase then
			normal_mutation = require("Module:string utilities").ucfirst(normal_mutation)
		end
	end
	local has_override = override
	if not yesno(override, true) or override == "-" then -- TODO: yesno to be removed.
		override = nil
	end
	local has_irreg_mutation = has_override and override ~= normal_mutation
	local mutation
	-- don't combine the following into A and B or C because `override` may be nil
	if has_override then
		mutation = override
	else
		mutation = normal_mutation
	end
	local marker = has_irreg_mutation and MARKER or ""
	if mutation then
		return require("Module:links").full_link({lang = lang, accel = {form = accel_form, lemma = data.radical}, term = mutation}) .. marker, true, has_irreg_mutation
	else
		return "''unchanged''" .. marker, false, has_irreg_mutation
	end
end

function export.show(frame)
	local params = {
		[1] = {},
		["soft"] = {},
		["nasal"] = {},
		["aspirate"] = {},
		["nocat"] = {type = "boolean"},
	}
	local parargs = frame:getParent().args
    local args = require("Module:parameters").process(parargs, params)
	
	local title = args[1] or PAGENAME
	local data = export.get_mutation_data(title)

	local soft, has_soft, has_irreg_soft = construct_mutation(data, "soft", data.mut1, args.soft)
	local nasal, has_nasal, has_irreg_nasal  = construct_mutation(data, "nasal", data.mut2, args.nasal)
	local aspirate, has_aspirate, has_irreg_aspirate = construct_mutation(data, data.vowel and "h-prothesis" or "aspirate", data.mut3, args.aspirate)

	local result = frame:expandTemplate{ 
		args {
		require("Template:Snon-decl-blank-full")
		}
		}
	return result
end

return export