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Module:la-headword

From Wiktionary, the free dictionary

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

-- TODO: handle "-old" subtypes generally, appending "in Old Latin", where terms have additional OL inflections.

local export = {}
local pos_functions = {}

local m_str_utils = require("Module:string utilities")
local m_table = require("Module:table")

local legal_gender = {
	["m"] = true,
	["f"] = true,
	["n"] = true,
	["?"] = true,
	["?!"] = true,
}

local declension_to_english = {
	["1"] = "first",
	["2"] = "second",
	["3"] = "third",
	["4"] = "fourth",
	["5"] = "fifth",
}

local gender_names = {
	["m"] = "masculine",
	["f"] = "feminine",
	["n"] = "neuter",
	["?"] = "unknown gender",
	["?!"] = "unattested gender",
}

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

local concat = table.concat
local deep_equals = m_table.deepEquals
local insert = table.insert
local insert_if_not = m_table.insertIfNot
local invert = m_table.invert
local pattern_escape = m_str_utils.pattern_escape
local remove = table.remove
local split = m_str_utils.split
local ulower = m_str_utils.lower
local umatch = mw.ustring.match

local NAMESPACE = mw.title.getCurrentTitle().namespace
local PAGENAME = mw.loadData("Module:headword/data").pagename

local function format(array, concatenater)
	if #array == 0 then
		return ""
	else
		local concatenated = concat(array, concatenater)
		if concatenated == "" then
			return ""
		elseif concatenated:match("'$") then
			concatenated = concatenated .. " "
		end
		return "; ''" .. concatenated .. "''"
	end
end

local function glossary_link(anchor, text)
	text = text or anchor
	return "[[Appendix:Glossary#" .. anchor .. "|" .. text .. "]]"
end

local function make_link(page, display, face, accel)
	return require("Module:links").full_link({term = page, alt = display, lang = lang, accel = accel}, face)
end

-- The main entry point.
-- This is the only function that can be invoked from a template.
function export.show(frame)
	local iargs = require("Module:parameters").process(frame.args, {
		[1] = {required = true},
		["def"] = true,
		["suff_type"] = true,
	})
	local args = frame:getParent().args
	local poscat = iargs[1]
	local def = iargs.def
	local suff_type = iargs.suff_type
	local postype = nil
	if suff_type then
		postype = poscat .. '-' .. suff_type
	else
		postype = poscat
	end

	local data = {lang = lang, categories = {}, heads = {}, genders = {}, inflections = {}}
	local infl_classes = {}
	local title = {}
	local postscript = {}

	if poscat == "suffixes" then
		insert_if_not(data.categories, "Latin " .. suff_type .. "-forming suffixes")
	end

	if pos_functions[postype] then
		local new_poscat = pos_functions[postype](def, args, data, infl_classes, title, postscript)
		if new_poscat then
			poscat = new_poscat
		end
	end

	if NAMESPACE == 118 then -- Reconstruction:
		data.pos_category = "reconstructed " .. poscat
		data.nolink = true
	else
		data.pos_category = poscat
	end

	postscript = concat(postscript, ", ")

	return
		require("Module:headword").full_headword(data)
		.. format(infl_classes, "/")
		.. format(title, ", ")
		.. (postscript ~= "" and " (" .. postscript .. ")" or "")
end

local function process_num_type(numtype, categories)
	if numtype == "card" then
		insert_if_not(categories, "Latin cardinal numbers")
	elseif numtype == "ord" then
		insert_if_not(categories, "Latin ordinal numbers")
	elseif numtype == "dist" then
		-- FIXME, should be named 'Latin distributive numbers'
		insert_if_not(categories, "la:Distributive numbers")
	elseif numtype == "mul" then
		-- FIXME, should be named 'Latin multiplicative numbers'
		insert_if_not(categories, "la:Multiplicative numbers")
	elseif numtype == "coll" then
		-- FIXME, should be named 'Latin collective numbers'
		insert_if_not(categories, "la:Collective numbers")
	elseif numtype then
		error("Unrecognized numeral type '" .. numtype .. "'")
	end
end

local function nouns(pos, def, args, data, infl_classes, title)
	local is_num = pos == "numerals"
	local is_pn = false
	if pos == "proper nouns" then
		is_pn = true
		pos = "nouns"
	end
	local decldata = require("Module:la-nominal").do_generate_noun_forms(args, pos, "headword", def, is_num)
	local lemma = decldata.overriding_lemma
	local lemma_num = decldata.num == "pl" and "pl" or "sg"
	if not lemma or #lemma == 0 then
		lemma = decldata.forms["linked_nom_" .. lemma_num]
		if decldata.unattested["nom_" .. lemma_num] then
			lemma[1] = '*' .. lemma[1]
		end
	end

	data.heads = lemma
	-- Since we always set data.heads to the lemma and specification of the lemma is mandatory in {{la-noun}}, there aren't
	-- really any redundant heads.
	data.no_redundant_head_cat = true
	data.id = decldata.id
	
	local genders = decldata.overriding_genders
	if #genders == 0 then
		if decldata.gender then
			genders = {ulower(decldata.gender)}
		elseif not is_num then
			error("No gender explicitly specified in headword template using g=, and can't infer gender from lemma spec")
		end
	end

	local categories = data.categories
	if is_num then
		process_num_type(decldata.num_type, categories)
	end

	if decldata.indecl then
		insert(data.inflections, {label = glossary_link("indeclinable")})
		insert_if_not(categories, "Latin indeclinable " .. decldata.pos)

		for _, g in ipairs(genders) do
			local gender = g:match("^(.[\128-\191]*)%-[sp]$")
			if not gender then
				gender = g
			end
			if not legal_gender[gender] then
				error("Gender “" .. gender .. "” is not a valid Latin gender.")
			end
			insert(data.genders, g)
			insert_if_not(categories, "Latin " .. gender_names[gender] .. " indeclinable " .. decldata.pos)
		end
	else
		local is_irreg = false
		local is_indecl = false
		local is_decl = false
		local has_multiple_decls = false
		local has_multiple_variants = false
		-- flatten declension specs
		local decls = {}

		for _, g in ipairs(genders) do
			if not legal_gender[g] then
				error("Gender “" .. g .. "” is not a valid Latin gender.")
			elseif decldata.num == "pl" then
				g = g .. "-p"
			elseif decldata.num == "sg" then
				g = g .. "-s"
			end
			insert(data.genders, g)
		end

		local function process_decl(decl_list, props)
			local headword_decl = props.headword_decl
			-- skip adjectival declensions
			if headword_decl:match("+$") then
				return
			elseif props.decl == "irreg" then
				is_irreg = true
				headword_decl = headword_decl:match("^irreg/(.*)$") or headword_decl
				local irreg_decls = split(headword_decl, ",")
				if #irreg_decls > 1 then
					has_multiple_decls = true
				end
				for _, d in ipairs(irreg_decls) do
					if d == "indecl" or d == "0" then
						is_indecl = true
					else
						is_decl = true
					end
					insert_if_not(decl_list, d)
				end
			else
				if headword_decl == "indecl" or headword_decl == "0" then
					is_indecl = true
				else
					is_decl = true
				end
				insert_if_not(decl_list, headword_decl)
			end
		end

		for _, props in ipairs(decldata.propses) do
			if props.headword_decl then
				process_decl(decls, props)
			else
				local alternant_decls = {}
				for _, alternant in ipairs(props) do
					for _, single_props in ipairs(alternant) do
						process_decl(alternant_decls, single_props)
					end
				end
				if #alternant_decls > 1 then
					has_multiple_decls = true
				elseif #decls > 1 then
					has_multiple_variants = true
				end
				for _, d in ipairs(alternant_decls) do
					insert_if_not(decls, d)
				end
			end
		end

		if is_indecl and is_decl then
			has_multiple_decls = true
		end
		if has_multiple_decls then
			insert_if_not(categories, "Latin " .. decldata.pos .. " with multiple declensions")
		end
		if has_multiple_variants then
			insert_if_not(categories, "Latin " .. decldata.pos .. " with multiple variants of a single declension")
		end
		if is_irreg then
			insert(title, glossary_link("irregular"))
			insert_if_not(categories, "Latin irregular " .. decldata.pos)
			for _, g in ipairs(genders) do
				insert_if_not(categories, "Latin " .. gender_names[g] .. " irregular " .. decldata.pos)
			end
		end

		if is_indecl then
			if is_decl then
				insert(title, glossary_link("indeclinable"))
			else
				insert(data.inflections, {label = glossary_link("indeclinable")})
			end
			insert_if_not(categories, "Latin indeclinable " .. decldata.pos)
			for _, g in ipairs(genders) do
				insert_if_not(categories, "Latin " .. gender_names[g] .. " indeclinable " .. decldata.pos)
			end
		end

		if #decls > 1 then
			insert(title, "variously declined")
		end

		for _, decl in ipairs(decls) do
			if not (decl == "0" or decl == "indecl" or decl == "sgpl" or decl == "irreg") then
				local decl_class = declension_to_english[decl]
				if not decl_class then
					error("Internal error: declension '" .. decl .. "' not recognized")
				end
				insert(title, "[[Appendix:Latin " .. decl_class .. " declension|" .. decl_class .. " declension]]")
				insert_if_not(categories, "Latin " .. decl_class .. " declension " .. decldata.pos)
				for _, g in ipairs(genders) do
					insert_if_not(categories, "Latin " .. gender_names[g] .. " " .. decldata.pos .. " in the " .. decl_class .. " declension")
				end
			end
		end

		if NAMESPACE == 118 then -- Reconstruction:
			-- For reconstructed nouns:
			if data.genders[1] == 'n' and lemma_num == 'sg' then
				-- singular neuter nouns give a plural
				local pl = decldata.forms["nom_pl"]
				if pl and pl ~= "" and #pl > 0 then
					pl.label = "plural"
					insert(data.inflections, pl)
				end
			else
				-- all others give an oblique
				local obl = decldata.forms["acc_" .. lemma_num]
				if obl and obl ~= "" and #obl > 0 then
					obl.label = "oblique"
					insert(data.inflections, obl)
				end
			end
		else
			local gen = decldata.forms["gen_" .. lemma_num]
			if (decldata.unattested["gen_" .. lemma_num]) then
				gen[1] = '*' .. gen[1]
				data.nolink = true
			end
			if gen and gen ~= "" and gen ~= "—" and #gen > 0 then
				if is_decl then
					-- Skip displaying the genitive for nouns that are only
					-- indeclinable. But we do display it for nouns like Abrahām
					-- and Ādām that can be either indeclinable or declined.
					gen.label = "genitive"
					insert(data.inflections, gen)
				end
			else
				insert(data.inflections, {label = "no genitive"})
				insert_if_not(categories, "Latin " .. decldata.pos .. " without a genitive singular")
			end
		end
	end

	if #decldata.m > 0 then
		decldata.m.label = "masculine"
		insert(data.inflections, decldata.m)
	end

	if #decldata.f > 0 then
		decldata.f.label = "feminine"
		insert(data.inflections, decldata.f)
	end

	for _, cat in ipairs(decldata.categories) do
		insert_if_not(categories, cat)
	end

	for _, cat in ipairs(decldata.cat) do
		insert_if_not(categories, "Latin " .. cat)
	end
	
	return is_pn and decldata.pos == "nouns" and "proper nouns" or decldata.pos
end

pos_functions["nouns"] = function(def, args, data, infl_classes, title)
	return nouns("nouns", def, args, data, infl_classes, title)
end

pos_functions["proper nouns"] = function(def, args, data, infl_classes, title)
	return nouns("proper nouns", def, args, data, infl_classes, title)
end

pos_functions["suffixes-noun"] = function(def, args, data, infl_classes, title)
	return nouns("suffixes", def, args, data, infl_classes, title)
end

pos_functions["numerals-noun"] = function(def, args, data, infl_classes, title)
	return nouns("numerals", def, args, data, infl_classes, title)
end

function export.verb_title(title, typeinfo, lemma_forms)
	local conj = typeinfo.conj
	local irreg_processing = typeinfo.irreg
	local subtypes = typeinfo.subtypes

	local first_lemma = ""
	if #lemma_forms > 0 then
		first_lemma = require("Module:links").remove_links(lemma_forms[1])
	end

	if conj == "1st" then
		insert(title, "[[Appendix:Latin first conjugation|first conjugation]]")
	elseif conj == "2nd" then
		insert(title, "[[Appendix:Latin second conjugation|second conjugation]]")
	elseif conj == "3rd" then
		insert(title, "[[Appendix:Latin third conjugation|third conjugation]]")
	elseif conj == "3rd-io" then
		insert(title, ("[[Appendix:Latin third conjugation|third conjugation]] %s-variant"):format(make_link(nil, "iō", "term")))
	elseif conj == "4th" then
		insert(title, "[[Appendix:Latin fourth conjugation|fourth conjugation]]")
	elseif conj == "irreg" then -- sum
		insert(title, "[[Appendix:Latin irregular verbs|irregular conjugation]]")
	end
	if subtypes.highlydef then -- āiō, inquam
		insert(title, "highly [[defective verb#English|defective]]")
	end
	if subtypes.suppl then -- sum, volō
		insert(title, "[[suppletive#English|suppletive]]")
	end
	if subtypes["3only"] then -- decet
		insert(title, "[[third person#English|third person]]-only")
	elseif subtypes.impers then -- decet, advesperāscit (also nopass)
		insert(title, "[[impersonal verb#English|impersonal]]")
	end
	if subtypes.depon then -- dēmōlior, calvor (also noperf)
		insert(title, "[[deponent#English|deponent]]")
	end
	if subtypes.perfaspres then -- meminī, ōdī
		insert(title, "no [[present tense#English|present]] stem")
		-- If semidepon is set, only the active forms are affected.
		local voice = subtypes.semidepon and "[[active voice#English|active]] " or ""
		insert(title, ("[[perfect tense#English|perfect]] %sforms have [[present tense#English|present]] %smeaning"):format(voice, voice))
		-- Clarify that deponency can only apply to the perfect.
		if subtypes.semidepon then -- ōdī
			insert(title, "[[deponent#English|deponent]] in the [[perfect tense#English|perfect]]")
		end
		if subtypes.optsemidepon then
			insert(title, "optionally [[deponent#English|deponent]] in the [[perfect tense#English|perfect]]")
		end
	else
		if subtypes.semidepon then -- fīdō, gaudeō
			insert(title, "[[semi-deponent#English|semi-deponent]]")
		end
		if subtypes.optsemidepon then -- audeō, placeō, soleō, pudeō
			insert(title, "optionally [[semi-deponent#English|semi-deponent]]")
		end
	end
	if subtypes.imponly then -- cedo, apage
		insert(title, "[[imperative mood#English|imperative]]-only")
	end
	if subtypes.nopass then -- coacēscō
		insert(title, "no [[passive voice#English|passive]]")
	end
	
	local stems = {}
	if subtypes.nopres then -- coepī; perfaspres already handles this above
		insert(stems, "[[present tense#English|present]]")
	end
	if subtypes.noperf then
		insert(stems, "[[perfect tense#English|perfect]]")
	end
	if subtypes.nosup or subtypes.supfutractvonly then
		insert(stems, "[[supine#English|supine]]")
	end
	if #stems > 0 then
		local extra = subtypes.supfutractvonly and " except in the [[future tense#English|future]] [[active voice#English|active]] [[participle#English|participle]]"
		insert(title, ("no %s stem%s%s"):format(m_table.serialCommaJoin(stems, {conj = "or"}), #stems > 1 and "s" or "", extra or ""))
	end
	if subtypes.nofut then -- soleō
		insert(title, "no [[future tense#English|future]]")
	end
	if subtypes.pass3only then -- praefundō
		insert(title, "[[third person#English|third person]]-only in the [[passive voice#English|passive]]")
	elseif subtypes.passimpers then -- abambulō
		local msg = "[[impersonal verb#English|impersonal]] in the [[passive voice#English|passive]]"
		if subtypes.passimpersold then -- possum
			msg = msg .. " in [[Old Latin]]"
		end
		insert(title, msg)
	end
	if subtypes.noimp then -- volō
		insert(title, "no [[imperative mood#English|imperative]]")
	end
	if irreg_processing and umatch(first_lemma, "d[īū]cō$") then -- dīcō
		insert(title, "[[Appendix:Latin irregular verbs|irregular]] short [[imperative mood#English|imperative]]")
	end
	if subtypes.nofutractvptc and not subtypes.nosup then -- fīō
		insert(title, "no [[future tense#English|future]] [[active voice#English|active]] [[participle#English|participle]]")
	end
	if not (subtypes.nopres or subtypes.perfaspres or subtypes.imponly) then
		if subtypes.noinf then -- inquam
			insert(title, "no [[infinitive#English|infinitive]]")
		end
		if subtypes.noger then -- libet
			insert(title, "no [[gerund#English|gerund]]")
		end
	end
	if subtypes.shorta then -- dō
		insert(title, ("[[Appendix:Latin irregular verbs|irregular]] short %s in most forms"):format(make_link(nil, "ă", "term")))
	end
	if irreg_processing then
		if first_lemma:match("edō$") then -- edō
			insert(title, "[[Appendix:Latin irregular verbs|irregular]] alternative forms")
		elseif first_lemma:match("fīō$") then -- fīō
			insert(title, "[[Appendix:Latin irregular verbs|irregular]] long " .. make_link(nil, "ī", "term"))
		end
	end
end

pos_functions["verbs"] = function(def, args, data, infl_classes, title)
	local m_la_verb = require("Module:la-verb")
	local def1, def2
	if def then
		def1, def2 = def:match("^(.-):(.*)$")
	end
	local conjdata, typeinfo = m_la_verb.make_data(args, true, def1, def2)
	local lemma_forms = conjdata.overriding_lemma
	if not lemma_forms or #lemma_forms == 0 then
		lemma_forms = m_la_verb.get_lemma_forms(conjdata, true)
	end
	data.heads = lemma_forms
	-- Since we always set data.heads to the lemma and specification of the lemma is mandatory in {{la-verb}}, there aren't
	-- really any redundant heads.
	data.no_redundant_head_cat = true
	data.id = conjdata.id
	
	local perf_only = false

	local function insert_inflection(infl, label)
		infl.label = label
		insert(data.inflections, infl)
	end

	local inf = m_la_verb.get_valid_forms(conjdata.forms["pres_actv_inf"])
	if #inf > 0 then
		insert_inflection(inf, "present infinitive")
	else
		inf = m_la_verb.get_valid_forms(conjdata.forms["perf_actv_inf"])
		if #inf > 0 then
			perf_only = true
			insert_inflection(inf, "perfect infinitive")
		end
	end

	if not perf_only then
		local perf = m_la_verb.get_valid_forms(conjdata.forms["1s_perf_actv_indc"])
		if #perf == 0 then
			perf = m_la_verb.get_valid_forms(conjdata.forms["3s_perf_actv_indc"])
		end
		if #perf > 0 then
			insert_inflection(perf, "perfect active")
		end
	end

	local subtypes = typeinfo.subtypes
	if not (subtypes.depon or subtypes.semidepon) then
		local sup = m_la_verb.get_valid_forms(conjdata.forms["acc_sup"])
		if #sup > 0 then
			insert_inflection(sup, "supine")
		else
			local fap = m_la_verb.get_valid_forms(conjdata.forms["futr_actv_ptc"])
			if #fap > 0 then
				insert_inflection(fap, "future active participle")
			end
		end
	end

	export.verb_title(title, typeinfo, lemma_forms)
end

pos_functions["suffixes-verb"] = pos_functions["verbs"]

local function attested_form(decldata, index)
	local form
	if (decldata.unattested[index]) then
		form = { { term = '*' .. decldata.forms[index][1], nolink = true } }
	else
		form = decldata.forms[index]
	end
	return form
end

local function adjectives(pos, def, args, data, infl_classes)
	local is_num = pos == "numerals"
	local decldata = require("Module:la-nominal").do_generate_adj_forms(args, pos, "headword", def, is_num)
	local lemma = decldata.overriding_lemma
	local lemma_num = decldata.num == "pl" and "pl" or "sg"
	if not lemma or #lemma == 0 then
		lemma = decldata.forms["linked_nom_" .. lemma_num .. "_m"]
		if decldata.unattested["nom_" .. lemma_num .. "_m"] then
			lemma[1] = '*' .. lemma[1]
		end
	end

	data.heads = lemma
	-- Since we always set data.heads to the lemma and specification of the lemma is mandatory in {{la-noun}}, there aren't
	-- really any redundant heads.
	data.no_redundant_head_cat = true
	data.id = decldata.id

	local categories = data.categories
	if is_num then
		process_num_type(decldata.num_type, categories)
	end

	if decldata.num == "pl" then
		insert_if_not(categories, "Latin plural-only " .. decldata.pos)
	end

	if decldata.indecl then
		insert(data.inflections, {label = glossary_link("indeclinable")})

		if decldata.pos == "participles" then
			if lemma[1]:match("[stxu]um$") then
				insert_if_not(categories, "Latin perfect participles")
			end
		end
	else
		local masc = decldata.forms["nom_" .. lemma_num .. "_m"]
		local fem = attested_form(decldata, "nom_" .. lemma_num .. "_f")
		local neut = attested_form(decldata, "nom_" .. lemma_num .. "_n")
		local gen = attested_form(decldata, "gen_" .. lemma_num .. "_m")
	
		if decldata.pos == "participles" then
			if masc[1]:match("ūrus$") then
				insert_if_not(categories, "Latin future active participles")
			elseif masc[1]:match("ndus$") then
				-- FIXME, should rename to "Latin gerundives")
				insert_if_not(categories, "Latin future passive participles")
			elseif masc[1]:match("[stxu]us$") then
				insert_if_not(categories, "Latin perfect participles")
			elseif masc[1]:match("ns$") then
				insert_if_not(categories, "Latin present participles")
			else
				error("Unrecognized participle ending: " .. masc[1])
			end
		end
	
		local function is_missing(form)
			return not form or form == "" or form == "—" or #form == 0
		end
		-- We display the inflections in three different ways to mimic the
		-- old way of doing things:
		--
		-- 1. If masc and fem are different, show masc, fem and neut.
		-- 2. Otherwise, if masc and neut are different, show masc and neut.
		-- 3. Otherwise, show masc nominative and masc genitive.
		if not is_missing(fem) and not deep_equals(masc, fem) then
			fem.label = "feminine"
			insert(data.inflections, fem)
			if not is_missing(neut) then
				neut.label = "neuter"
				insert(data.inflections, neut)
			end
		elseif not is_missing(neut) and not deep_equals(masc, neut) then
			neut.label = "neuter"
			insert(data.inflections, neut)
		elseif not is_missing(gen) then
			gen.label = "genitive"
			insert(data.inflections, gen)
		end

		insert(infl_classes, decldata.title)
	end

	if #decldata.comp > 0 then
		decldata.comp.label = "comparative"
		insert(data.inflections, decldata.comp)
	end
	if #decldata.sup > 0 then
		decldata.sup.label = "superlative"
		insert(data.inflections, decldata.sup)
	end
	if #decldata.adv > 0 then
		decldata.adv.label = "adverb"
		insert(data.inflections, decldata.adv)
	end

	for _, cat in ipairs(decldata.categories) do
		insert_if_not(categories, cat)
	end

	for _, cat in ipairs(decldata.cat) do
		insert_if_not(categories, "Latin " .. cat)
	end
	
	return decldata.pos
end

pos_functions["adjectives"] = function(def, args, data, infl_classes, title)
	return adjectives("adjectives", def, args, data, infl_classes, title)
end

pos_functions["comparative adjectives"] = function(def, args, data, infl_classes)
	local list = {list = true}
	args = require("Module:parameters").process(args, {
		[1] = {alias_of = 'head'},
		[2] = {alias_of = 'pos'},
		["head"] = list,
		["is_lemma"] = {type = "boolean"}, -- comparative-only adjective
		-- The following two are intended for comparative-only adjectives.
		["pos"] = list,
		["sup"] = list,
		["id"] = true,
	})
	data.no_redundant_head_cat = #args.head == 0
	-- Set default manually so we can tell whether the user specified head=.
	if #args.head == 0 then
		args.head = {PAGENAME}
	end
	data.heads = args.head
	data.id = args.id

	if args.is_lemma then
		insert(data.inflections, {label = "comparative-only"})
		insert_if_not(data.categories, "Latin comparative-only adjectives")
	else
		insert(data.inflections, {label = "comparative"})
	end
	insert(infl_classes, "[[Appendix:Latin third declension|third declension]]")

	local n = {label = "neuter"}
	for _, head in ipairs(args.head) do
		local neuter = head:gsub("or$", "us")
		insert(n, neuter)
	end

	insert(data.inflections, n)

	if #args.pos > 0 then
		args.pos.label = "positive"
		insert(data.inflections, args.pos)
	end
	if #args.sup > 0 then
		args.sup.label = "superlative"
		insert(data.inflections, args.sup)
	end
	if args.is_lemma then
		-- If is_lemma, we're a comparative adjective without positive form,
		-- so we're treated as a lemma. In that case, we return "adjectives" as
		-- the part of speech, which will automatically categorize into
		-- "Latin adjectives" and "Latin lemmas"; otherwise we don't return
		-- anything, which defaults to the passed-in POS (usually
		-- "comparative adjectives"), which will automatically categorize into
		-- that POS (e.g. "Latin comparative adjectives") and into
		-- "Latin non-lemma forms".
		return "adjectives"
	end
end

pos_functions["superlative adjectives"] = function(def, args, data, infl_classes)
	local list = {list = true}
	args = require("Module:parameters").process(args, {
		[1] = {alias_of = 'head'},
		[2] = {alias_of = 'pos'},
		["head"] = list,
		["is_lemma"] = {type = "boolean"}, -- superlative-only adjective
		-- The following two are intended for superlative-only adjectives.
		["pos"] = list,
		["comp"] = list,
		["id"] = true,
	})
	data.no_redundant_head_cat = #args.head == 0
	-- Set default manually so we can tell whether the user specified head=.
	if #args.head == 0 then
		args.head = {PAGENAME}
	end
	data.heads = args.head
	data.id = args.id

	if args.is_lemma then
		insert(data.inflections, {label = "superlative-only"})
		insert_if_not(data.categories, "Latin superlative-only adjectives")
	else
		insert(data.inflections, {label = "superlative"})
	end
	insert(infl_classes, "[[Appendix:Latin first declension|first]]")
	insert(infl_classes, "[[Appendix:Latin second declension|second declension]]")

	local f, n = {label = "feminine"}, {label = "neuter"}
	for _, head in ipairs(args.head) do
		local stem = head:gsub("us$", "")
		insert(f, stem .. "a")
		insert(n, stem .. "um")
	end

	insert(data.inflections, f)
	insert(data.inflections, n)

	if #args.pos > 0 then
		args.pos.label = "positive"
		insert(data.inflections, args.pos)
	end
	if #args.comp > 0 then
		args.comp.label = "comparative"
		insert(data.inflections, args.comp)
	end
	if args.is_lemma then
		-- If is_lemma, we're a superlative adjective without positive form,
		-- so we're treated as a lemma. In that case, we return "adjectives" as
		-- the part of speech, which will automatically categorize into
		-- "Latin adjectives" and "Latin lemmas"; otherwise we don't return
		-- anything, which defaults to the passed-in POS (usually
		-- "superlative adjectives"), which will automatically categorize into
		-- that POS (e.g. "Latin superlative adjectives") and into
		-- "Latin non-lemma forms".
		return "adjectives"
	end
end

pos_functions["participles"] = function(def, args, data, infl_classes, title)
	return adjectives("participles", def, args, data, infl_classes, title)
end

pos_functions["determiners"] = function(def, args, data, infl_classes, title)
	return adjectives("determiners", def, args, data, infl_classes, title)
end

pos_functions["pronouns"] = function(def, args, data, infl_classes, title)
	return adjectives("pronouns", def, args, data, infl_classes, title)
end

pos_functions["suffixes-adjective"] = function(def, args, data, infl_classes, title)
	return adjectives("suffixes", def, args, data, infl_classes, title)
end

pos_functions["numerals-adjective"] = function(def, args, data, infl_classes, title)
	return adjectives("numerals", def, args, data, infl_classes, title)
end

pos_functions["adverbs"] = function(def, args, data)
	local list = {list = true}
	args = require("Module:parameters").process(args, {
		[1] = {alias_of = 'head'},
		[2] = {alias_of = 'comp'},
		[3] = {alias_of = 'sup'},
		["head"] = {list = true, required = true},
		["comp"] = list,
		["sup"] = list,
		["id"] = true,
	})
	data.heads = args.head
	data.no_redundant_head_cat = true -- since head= is required
	data.id = args.id
	local comp, sup
	local irreg = false

	if args.comp[1] == "-" then
		comp = "-"
	elseif #args.comp > 0 then
		args.comp.label = glossary_link("comparative")
		comp = args.comp
		irreg = true
	end
	if args.comp[1] == "-" or args.sup[1] == "-" then
		sup = "-"
	elseif #args.sup > 0 then
		args.sup.label = glossary_link("superlative")
		sup = args.sup
		irreg = true
	end
	local categories = data.categories
	if irreg then
		insert_if_not(categories, "Latin irregular adverbs")
	end

	if not comp or not sup then
		local default_comp = {label = glossary_link("comparative")}
		local default_sup = {label = glossary_link("superlative")}
		for _, head in ipairs(args.head) do
			local stem = nil
			for _, suff in ipairs({"iter", "nter", "ter", "er", "iē", "ē", "im", "ō"}) do
				stem = head:match("(.*)" .. pattern_escape(suff) .. "$")
				if stem ~= nil then
					if suff == "nter" then
						stem = stem .. "nt"
						suff = "er"
					end
					insert(default_comp, stem .. "ius")
					insert(default_sup, stem .. "issimē")
					break
				end
			end
			if not stem then
				error("Unrecognized adverb type, recognized types are “-ē”, “-er”, “-ter”, “-iter”, “-im”, or “-ō” or specify irregular forms or “-” if incomparable.")
			end
		end
		comp = comp or default_comp
		sup = sup or default_sup
	end

	if comp == "-" then
		insert(data.inflections, {label = "not [[Appendix:Glossary#comparative|comparable]]"})
		insert_if_not(categories, "Latin uncomparable adverbs")
	else
		insert(data.inflections, comp)
	end
	if sup == "-" then
		if comp ~= "-" then
			insert(data.inflections, {label = "no [[Appendix:Glossary#superlative|superlative]]"})
		end
	else
		insert(data.inflections, sup)
	end
end

pos_functions["suffixes-adverb"] = pos_functions["adverbs"]

local function adpositions(pos, def, args, data, infl_classes, title, postscript)
	local cases = invert(require("Module:la-utilities").cases)

	args = require("Module:parameters").process(args, {
		[1] = {alias_of = 'head'},
		[2] = {list = true, set = m_table.keysToList(cases)},
		["head"] = {list = true, required = true},
		["id"] = true,
	})

	-- Case names are supplied in numbered arguments, optionally preceded by
	-- headwords.
	cases = args[2]
	for i = 1, #cases do
		for j = i + 1, #cases do
			if cases[i] == cases[j] then
				error("Duplicate case")
			end
		end
		local case = cases[i]
		local appendix_link = glossary_link(case)
		if i == 1 then
			appendix_link = "+ " .. appendix_link
		end
		insert(postscript, appendix_link)
		insert_if_not(data.categories, "Latin " .. case .. " " .. pos)
	end

	data.heads = args.head
	data.no_redundant_head_cat = true -- since head= is required
	data.id = args.id
end

pos_functions["prepositions"] = function(...)
	return adpositions("prepositions", ...)
end

pos_functions["postpositions"] = function(...)
	return adpositions("postpositions", ...)
end

pos_functions["gerunds"] = function(def, args, data)
	args = require("Module:parameters").process(args, {
		[1] = {required = true, default = "labōrandum"}, -- headword
		[2] = true, -- gerundive
	})

	data.heads = {args[1]}
	data.no_redundant_head_cat = true -- since 1= is required and goes into data.heads
	insert(data.inflections, {label = "[[Appendix:Glossary#accusative|accusative]]"})
	local stem = args[1]:match("^(.*)um$")
	if not stem then
		error("Unrecognized gerund ending: " .. stem)
	end
	if args[2] == "-" then
		insert(data.inflections, {label = "no [[Appendix:Glossary#gerundive|gerundive]]"})
	else
		insert(data.inflections, {[1] = args[2] or stem .. "us", label = "[[Appendix:Glossary#gerundive|gerundive]]"})
	end
end

local function non_lemma_forms(def, args, data)
	args = require("Module:parameters").process(args, {
		[1] = {required = true, default = def}, -- headword or cases
		["head"] = {list = true, require_index = true},
		["g"] = {list = true},
		["id"] = true,
	})

	local heads = {args[1]}
	for _, head in ipairs(args.head) do
		insert(heads, head)
	end
	data.heads = heads
	data.no_redundant_head_cat = true -- since 1= is required and goes into data.heads
	data.genders = args.g
	data.id = args.id
end

pos_functions["noun forms"] = non_lemma_forms
pos_functions["proper noun forms"] = non_lemma_forms
pos_functions["pronoun forms"] = non_lemma_forms
pos_functions["verb forms"] = non_lemma_forms
pos_functions["gerund forms"] = non_lemma_forms
pos_functions["adjective forms"] = non_lemma_forms
pos_functions["participle forms"] = non_lemma_forms
pos_functions["determiner forms"] = non_lemma_forms
pos_functions["numeral forms"] = non_lemma_forms
pos_functions["suffix forms"] = non_lemma_forms

return export