Module:descendants

Underlies {{descendant}} and {{descendant tree}}.

---

local export = {}
local getArgs = require("Module:Arguments").getArgs
local m_links = require("Module:links")
local m_languages = require("Module:languages")
local m_inline = require("Module:inline")

function export.descendant(frame)
	local args = getArgs(frame)
	local out = ""
	local lang = m_languages.get_by_code(args[1])
	local borrowed = args["borrowed"] or args["bor"] or args["b"]
	local see_desc = args["see"]
	local noname = args["noname"]
	local lostcap = args["lost"] or "lost"
	
	if borrowed then out = "<span class=\"desc-arrow\" title=\"borrowed\">→</span>" .. out end
	if not noname then out = out .. lang.name .. ":&nbsp;" end
	
	if args[2] then
		local terms = {}
		local i = 2
		while args[i] do
			local term, term_args = m_inline.parse(args[i])
			table.insert(terms, m_links.full_link({
					language = lang,
					term = term,
					alt = term_args.alt,
					anchor = term_args.anchor or term_args.a,
					gloss = term_args.t,
					pos = term_args.pos,
					nobold = true,
				})
			)
			i = i + 1	
		end
		out = out .. table.concat(terms, ", ")
		if see_desc then out = out .. frame:expandTemplate{ title = 'see descendants' } end
	else
		out = out .. "— (''" .. lostcap .. "'')"
	end
	
	return out
end

local function triage_langs(list)
	
end

function export.tree(frame)
	local args = getArgs(frame)
	local out = ""
	local current_lang
	local terms = {}
	local langs = {}
	
	for i, term in ipairs(args) do --ryn:term1|term2|term3|rad:term1|term2 ...
		local lang_change = mw.ustring.match(term, "^([^%:%<]+)%:")
		local lang_change_arged = mw.ustring.match(term, "^(.+%>)%:")
		if i == 1 and not (lang_change or lang_change_arged) then error("Language code needs to be specified in the first parameter as xyz(<bor>):term₁") end
		if lang_change or lang_change_arged then
			if lang_change then
				current_lang = m_languages.get_by_code(lang_change)
				term = mw.ustring.gsub(term, "^[^%:]+%:%s*", "")
			elseif lang_change_arged then
				current_lang = m_languages.get_by_code(mw.ustring.match(lang_change_arged, "^[^%<]+"))
				term = mw.ustring.gsub(term, "^.+%>%:%s*", "")
			end
			if terms[current_lang.code] == nil then
				terms[current_lang.code] = {}
				table.insert(langs, current_lang)
			end
		end
		if lang_change_arged then
			for lang_arg in mw.ustring.gmatch(lang_change_arged, "%<([^%>]+)%>") do
				terms[current_lang.code][lang_arg] = true
			end
		end
		table.insert(terms[current_lang.code], term)
	end
	
	local items = {}
	
	for lang, lang_args in pairs(terms) do
		table.insert(lang_args, 1, lang)
		items[lang] = export.descendant(lang_args)
	end
	
	mw.logObject(items)
end

return export

--[[
Debug console test string:
=p.descendant(mw.getCurrentFrame():newChild{title="whatever",args={"rad"}})
=p.tree(mw.getCurrentFrame():newChild{title="whatever",args={"rad:hello", "hi"}})
]]--