Module:gmh-noun

local export = {}


--[=[

Authorship: Zhnka; heavily based on ] by Benwing

FIXME: Still contains lots of improperly converted Czech-specific code.

]=]

--[=[

TERMINOLOGY:

-- "slot" = A particular combination of case/number.
	 Example slot names for nouns are "gen_s" (genitive singular).

-- "form" = The declined Czech form representing the value of a given slot.

-- "lemma" = The dictionary form of a given Czech term. Generally the nominative
	 masculine singular, but may occasionally be another form if the nominative
	 masculine singular is missing.
]=]

local lang = require("Module:languages").getByCode("gmh")
local m_table = require("Module:table")
local m_links = require("Module:links")
local m_string_utilities = require("Module:string utilities")
local iut = require("Module:inflection utilities")
local put = require("Module:parse utilities")
local m_para = require("Module:parameters")
local com = require("Module:gmh-common")
local en_utilities_module = "Module:en-utilities"

local current_title = mw.title.getCurrentTitle()
local NAMESPACE = current_title.nsText
local PAGENAME = current_title.text

local u = mw.ustring.char
local rsplit = mw.text.split
local rfind = mw.ustring.find
local rmatch = mw.ustring.match
local rgmatch = mw.ustring.gmatch
local rsubn = mw.ustring.gsub
local ulen = mw.ustring.len
local usub = mw.ustring.sub
local uupper = mw.ustring.upper
local ulower = mw.ustring.lower

local force_cat = false -- set to true to make categories appear in non-mainspace pages, for testing

-- version of rsubn() that discards all but the first return value
local function rsub(term, foo, bar)
	local retval = rsubn(term, foo, bar)
	return retval
end


-- version of rsubn() that returns a 2nd argument boolean indicating whether
-- a substitution was made.
local function rsubb(term, foo, bar)
	local retval, nsubs = rsubn(term, foo, bar)
	return retval, nsubs > 0
end


local function track(track_id)
	require("Module:debug/track")("gmh-noun/" .. track_id)
	return true
end


local output_noun_slots = {
	nom_s = "nom|s",
	gen_s = "gen|s",
	dat_s = "dat|s",
	acc_s = "acc|s",
	nom_p = "nom|p",
	gen_p = "gen|p",
	dat_p = "dat|p",
}


local function get_output_noun_slots(alternant_multiword_spec)
	-- FIXME: To save memory we modify the table in-place. This won't work if we ever end up with multiple calls to
	-- this module in the same Lua invocation, and we would need to clone the table.
	if alternant_multiword_spec.actual_number ~= "both" then
		for slot, accel_form in pairs(output_noun_slots) do
			output_noun_slots = accel_form:gsub("|$", "")
		end
	end
	return output_noun_slots
end


local potential_lemma_slots = {"nom_s", "nom_p", "gen_s"}


local cases = {
	nom = true,
	gen = true,
	dat = true,
	acc = true,
}

local function skip_slot(number, slot)
	return number == "sg" and rfind(slot, "_p$") or
		number == "pl" and rfind(slot, "_s$")
end


-- Basic function to combine stem(s) and ending(s) and insert the result into the appropriate slot. `stems` is either
-- the `stems` object passed into the declension functions (containing the various stems; see below) or a string to
-- override the stem. (NOTE: If you pass a string in as `stems`, you should pass the value of `stems.footnotes` as the
-- value of `footnotes` as it will be lost otherwise. If you need to supply your own footnote in addition, use
-- iut.combine_footnotes() to combine any user-specified footnote(s) with your footnote(s).) `endings` is either a
-- string specifying a single ending or a list of endings. If `endings` is nil, no forms are inserted. If an ending is
-- "-", the value of `stems` is ignored and the lemma is used instead as the stem; this is important in case the user
-- used `decllemma:` to specify a declension lemma different from the actual lemma, or specified '.foreign' (which has
-- a similar effect).
local function add(base, slot, stems, endings, footnotes)
	if not endings then
		return
	end
	-- Call skip_slot() based on the declined number; if the actual number is different, we correct this in
	-- decline_noun() at the end.
	if skip_slot(base.number, slot) then
		return
	end
	local stems_footnotes = type(stems) == "table" and stems.footnotes or nil
	footnotes = iut.combine_footnotes(iut.combine_footnotes(base.footnotes, stems_footnotes), footnotes)
	if type(endings) == "string" then
		endings = {endings}
	end
	for _, ending in ipairs(endings) do
		-- Compute the stem. If ending is "-", use the lemma regardless. Otherwise if `stems` is a string, use it.
		-- Otherwise `stems` is an object containing four stems (vowel-vs-non-vowel cross regular-vs-oblique);
		-- compute the appropriate stem based on the slot and whether the ending begins with a vowel.
		local stem
		if ending == "-" then
			stem = base.actual_lemma
			ending = ""
		elseif type(stems) == "string" then
			stem = stems
		else
			local is_vowel_ending = rfind(ending, "^" .. com.vowel_c)
			if stems.oblique_slots == "all" or
				(stems.oblique_slots == "gen_p" or stems.oblique_slots == "all-oblique") and slot == "gen_p" or
				stems.oblique_slots == "all-oblique" and (slot == "ins_s" or slot == "dat_p" or slot == "loc_p" or slot == "ins_p") then
				if is_vowel_ending then
					stem = stems.oblique_vowel_stem
				else
					stem = stems.oblique_nonvowel_stem
				end
			elseif is_vowel_ending then
				stem = stems.vowel_stem
			else
				stem = stems.nonvowel_stem
			end
		end
		-- Maybe apply the first or second Slavic palatalization.
		ending = iut.combine_form_and_footnotes(ending, footnotes)
		local function combine_stem_ending(stem, ending)
			return com.combine_stem_ending(base, slot, stem, ending)
		end
		iut.add_forms(base.forms, slot, stem, ending, combine_stem_ending)
	end
end


local function process_slot_overrides(base, do_slot)
	for slot, overrides in pairs(base.overrides) do
		-- Call skip_slot() based on the declined number; if the actual number is different, we correct this in
		-- decline_noun() at the end.
		if skip_slot(base.number, slot) then
			error("Override specified for invalid slot '" .. slot .. "' due to '" .. base.number .. "' number restriction")
		end
		if do_slot(slot) then
			base.slot_overridden = true
			base.forms = nil
			for _, override in ipairs(overrides) do
				for _, value in ipairs(override.values) do
					local form = value.form
					local combined_notes = iut.combine_footnotes(base.footnotes, value.footnotes)
					if override.full then
						if form ~= "" then
							iut.insert_form(base.forms, slot, {form = form, footnotes = combined_notes})
						end
					else
						-- Convert a null ending to "-" in the acc/voc sg slots so that e.g. ] declared as
						-- <m.sg.foreign.gena:u.acc-:a> works correctly and generates accusative 'Kerberos/Kerbera' not
						-- #'Kerber/Kerbera'.
						if (slot == "acc_s" or slot == "voc_s") and form == "" then
							form = "-"
						end
						for _, stems in ipairs(base.stem_sets) do
							add(base, slot, stems, form, combined_notes)
						end
					end
				end
			end
		end
	end
end


local function add_decl(base, stems,
	gen_s, dat_s, acc_s,
	nom_p, gen_p, dat_p, nom_s, footnotes
)
	add(base, "nom_s", stems, "-", footnotes)
	add(base, "gen_s", stems, gen_s, footnotes)
	add(base, "dat_s", stems, dat_s, footnotes)
	add(base, "acc_s", stems, acc_s, footnotes)
	if base.number == "pl" then
		-- If this is a plurale tantum noun and we're processing the nominative plural, use the user-specified lemma
		-- rather than generating the plural from the synthesized singular, which may not match the specified lemma
		-- (e.g. ] "Olomouc cheese" using <m.pl.mixed> would try to generate 'tvargle/tvargly', and ]
		-- "money" using <m.pl.#ě.genpl-> would try to generate 'peněze').
		local acc_p_like_nom = m_table.deepEquals(nom_p, acc_p)
		nom_p = "-"
		if acc_p_like_nom then
			acc_p = "-"
		end
	end
	add(base, "nom_p", stems, nom_p, footnotes)
	add(base, "gen_p", stems, gen_p, footnotes)
	add(base, "dat_p", stems, dat_p, footnotes)
	add(base, "nom_s", stems, nom_s, footnotes)
end

local function add_sg_decl(base, stems,
	gen_s, dat_s, acc_s, footnotes
)
	add_decl(base, stems, gen_s, dat_s, acc_s,
		nil, nil, nil, nil, nil, footnotes)
end

local function add_pl_only_decl(base, stems,
	gen_p, dat_p, footnotes
)
	add_decl(base, stems, nil, nil, nil,
		"-", gen_p, dat_p, nil, footnotes)
end


local function handle_derived_slots_and_overrides(base)
	local function is_non_derived_slot(slot)
		return slot ~= "voc_p" and slot ~= "acc_s" and slot ~= "clitic_acc_s"
	end

	local function is_derived_slot(slot)
		return not is_non_derived_slot(slot)
	end

	base.slot_overridden = {}
	-- Handle overrides for the non-derived slots. Do this before generating the derived
	-- slots so overrides of the source slots (e.g. nom_p) propagate to the derived slots.
	process_slot_overrides(base, is_non_derived_slot)

	-- Handle overrides for derived slots, to allow them to be overridden.
	process_slot_overrides(base, is_derived_slot)

	-- Compute linked versions of potential lemma slots, for use in {{gmh-noun}}.
	-- We substitute the original lemma (before removing links) for forms that
	-- are the same as the lemma, if the original lemma has links.
	for _, slot in ipairs(potential_lemma_slots) do
		iut.insert_forms(base.forms, slot .. "_linked", iut.map_forms(base.forms, function(form)
			if form == base.orig_lemma_no_links and rfind(base.orig_lemma, "%[%[") then
				return base.orig_lemma
			else
				return form
			end
		end))
	end
end


-- Table mapping declension types to functions to decline the noun. The function takes two arguments, `base` and
-- `stems`; the latter specifies the computed stems (vowel vs. non-vowel, singular vs. plural) and whether the noun
-- is reducible and/or has vowel alternations in the stem. Most of the specifics of determining which stem to use
-- and how to modify it for the given ending are handled in add_decl(); the declension functions just need to generate
-- the appropriate endings.
local decls = {}
-- Table specifying additional properties for declension types. Every declension type must have such a table, which
-- specifies which category or categories to add and what annotation to show in the title bar of the declension table.
--
-- * Only the `cat` property of this table is mandatory; there is also a `desc` property to specify the annotation, but
--   this can be omitted and the annotation will then be computed from the `cat` property. The `cat` property is either
--   a string, a list of strings or a function (of two arguments, `base` and `stems` as above) returning a string or
--   list of strings. The string can contain the keywords GENDER to substitute the gender and POS (to substitute the
--   pluralized part of speech). The keyword GENPOS is equivalent to 'GENDER POS'. If no keyword is present, ' GENPOS'
--   is added onto the end. If only GENDER is present, ' POS' is added onto the end. In all cases, the language name is
--   added onto the beginning to form the full category name.
-- * The `desc` property is of the same form as the `cat` property and specifies the annotation to display in the title
--   bar (which may have the same format as the category minus the part of speech, or may be abbreviated). The value
--   may not be a list of strings, as only one annotation is displayed. If omitted, it is derived from the category
--   spec(s) by taking the last category (if more than one is given) and removing ' POS' before keyword substitution.
local declprops = {}


decls = function(base, stems)
	if base.name then
		if rfind(base.lemma, "$") then
			add_decl(base, stems, {"s", "es"}, {"-", "e", "n", "en"}, {"-", "n", "en", "e"})
		elseif rfind(base.lemma, com.vowel_c .. com.cons_c .. "*e$") then
			add_decl(base, stems, {"s", "es"}, {"-", "e", "en"}, {"-", "en", "e"})
		else
			add_decl(base, stems, "es", {"-", "e", "en"}, {"-", "en", "e"})
		end
	else
		if rfind(base.lemma, "$") then
			add_decl(base, stems, {"s", "es"}, {"-", "e"}, "-", {"-", "e"}, {"-", "e"}, {"n", "en"})
		elseif rfind(base.lemma, com.vowel_c .. com.cons_c .. "*e$") then
			add_decl(base, stems, {"s", "es"}, {"-", "e"}, "-", {"-", "e"}, {"-", "e"}, "en")
		else
			add_decl(base, stems, "es", "e", "-", "e", "e", "en")
		end
	end
end

declprops = {
	cat = "strong GENPOS without umlaut"
}

decls = function(base, stems)
	add_decl(base, stems, "es", "e", "-")
	add_decl(base, com.apply_vowel_alternation("quant", com.secondary_umlaut(stems.oblique_vowel_stem)),
		nil, nil, nil, "e", "e", "en")
end

declprops = {
	cat = "strong GENPOS with umlaut"
}

decls = function(base, stems)
	add_decl(base, stems, {"er", "ers"}, "er", "er")
	add_decl(base, com.apply_vowel_alternation("quant", com.secondary_umlaut(stems.oblique_vowel_stem)),
		nil, nil, nil, "er", "er", "ern")
end

declprops = {
	cat = "strong GENPOS in -r"
}

decls = function(base, stems)
	add_decl(base, stems, "n", "n", "n", "n", "n", "n")
end

declprops = {
	cat = "weak GENDER"
}

decls = function(base, stems)
	add_decl(base, stems, "-", "-", "-", "-", "n", "n")
end

declprops = {
	cat = "strong GENPOS in -e"
}

decls = function(base, stems)
	local umstems = com.apply_vowel_alternation("quant", com.secondary_umlaut(stems.oblique_vowel_stem))
	if base.name then
		add_decl(base, umstems, "e", "e", "e")
	else
		add_decl(base, umstems, "e", "e", nil, "e", "e", "en")
	end
	add_decl(base, stems, "-", "-", "-")
end

declprops = {
	cat = "strong GENPOS ending in a consonant"
}

decls = function(base, stems)
	add_decl(base, stems, "er", "er", "er")
	add_decl(base, com.apply_vowel_alternation("quant", com.secondary_umlaut(stems.oblique_vowel_stem)),
		nil, nil, nil, "er", "er", "ern")
end

declprops = {
	cat = "strong GENPOS in -r"
}

decls = function(base, stems)
	add_decl(base, stems, "n", "n", "n", "n", "n", "n")
end

declprops = {
	cat = "weak GENDER"
}

decls = function(base, stems)
	if base.loc then
		add_decl(base, stems, "es", "e", "-", "-", "e", "en")
		add_decl(base, stems, {}, "-", {}, {}, {}, {}, {}, "")
	elseif rfind(base.lemma, "$") then
		add_decl(base, stems, {"s", "es"}, {"-", "e"}, "-", "-", {"-", "e"}, {"n", "en"})
	elseif rfind(base.lemma, com.vowel_c .. com.cons_c .. "*e$") then
		add_decl(base, stems, {"s", "es"}, {"-", "e"}, "-", "-", {"-", "e"}, "en")
	else
		add_decl(base, stems, "es", "e", "-", "-", "e", "en")
	end
end

declprops = {
	cat = "strong GENPOS with null plural"
}

decls = function(base, stems)
	add_decl(base, stems, "es", "e", "-")
	add_decl(base, com.apply_vowel_alternation("quant", com.secondary_umlaut(stems.oblique_vowel_stem)), nil, nil, nil, "er", "er", "ern")
end

declprops = {
	cat = "strong GENPOS with plural in -er"
}

decls = function(base, stems)
	add_decl(base, stems, "n", "n", "", "n", "n", "n")
end

declprops = {
	cat = "weak GENDER"
}

decls = function(base, stems)
	-- Indeclinable. Note that fully indeclinable nouns should not have a table at all rather than one all of whose
	-- forms are the same; but having an indeclinable declension is useful for nouns that may or may not be
	-- indeclinable, e.g. ] "group of ten" or the plural of ], which may be indeclinable 'pesos'.
	add_decl(base, stems, "-", "-", "-", "-", "-", "-",
		"-", "-", "-", "-", "-", "-")
end

declprops = {
	cat = {"indeclinable POS", "indeclinable GENPOS"}
}


decls = function(base, stems)
	-- Anything declined manually using overrides. We don't set any declensions except the nom_s (or nom_p if plurale
	-- tantum).
	add(base, base.number == "pl" and "nom_p" or "nom_s", stems, "-")
end

declprops = {
	desc = "GENDER",
	cat = {},
}

local function fetch_footnotes(separated_group)
	local footnotes
	for j = 2, #separated_group - 1, 2 do
		if separated_group ~= "" then
			error("Extraneous text after bracketed footnotes: '" .. table.concat(separated_group) .. "'")
		end
		if not footnotes then
			footnotes = {}
		end
		table.insert(footnotes, separated_group)
	end
	return footnotes
end


--[=[
Parse a single override spec (e.g. 'nomplé:ové' or 'ins:autodráhou:autodrahou') and return
two values: the slot(s) the override applies to, and an object describing the override spec.
The input is actually a list where the footnotes have been separated out; for example,
given the spec 'inspl:čobotami:čobotámi:čobitmi', the input will be a list
{"inspl:čobotami:čobotámi", "", ":čobitmi", "", ""}. The object returned
for 'ins:autodráhou:autodrahou' looks like this:

{
  full = true,
  values = {
	{
	  form = "autodráhou"
	},
	{
	  form = "autodrahou",
	  footnotes = {""}
	}
  }
}

The object returned for 'nomplé:ové' looks like this:

{
  values = {
	{
	  form = "é",
	},
	{
	  form = "ové",
	}
  }
}
]=]
local function parse_override(segments)
	local retval = {values = {}}
	local part = segments
	local slots = {}
	while true do
		local case = usub(part, 1, 3)
		if cases then
			-- ok
		else
			error(("Unrecognized case '%s' in override: '%s'"):format(case, table.concat(segments)))
		end
		part = usub(part, 4)
		local slot
		if rfind(part, "^pl") then
			part = usub(part, 3)
			slot = case .. "_p"
		else
			slot = case .. "_s"
		end
		table.insert(slots, slot)
		if rfind(part, "^%+") then
			part = usub(part, 2)
		else
			break
		end
	end
	if rfind(part, "^:") then
		retval.full = true
		part = usub(part, 2)
	end
	segments = part
	local colon_separated_groups = put.split_alternating_runs_and_strip_spaces(segments, ":")
	for i, colon_separated_group in ipairs(colon_separated_groups) do
		local value = {}
		local form = colon_separated_group
		if form == "" then
			error(("Use - to indicate an empty ending for slot%s '%s': '%s'"):format(#slots > 1 and "s" or "", table.concat(slots), table.concat(segments)))
		elseif form == "-" then
			value.form = ""
		else
			value.form = form
		end
		value.footnotes = fetch_footnotes(colon_separated_group)
		table.insert(retval.values, value)
	end
	return slots, retval
end


--[=[
Parse an indicator spec (text consisting of angle brackets and zero or more
dot-separated indicators within them). Return value is an object of the form

{
  overrides = {
	SLOT = {OVERRIDE, OVERRIDE, ...}, -- as returned by parse_override()
	...
  },
  forms = {}, -- forms for a single spec alternant; see `forms` below
  footnotes = {"FOOTNOTE", "FOOTNOTE", ...}, -- may be missing
  stems = { -- may be missing
	{
	  reducible = TRUE_OR_FALSE,
	  footnotes = {"FOOTNOTE", "FOOTNOTE", ...}, -- may be missing
	  -- The following fields are filled in by determine_stems()
	  vowel_stem = "STEM",
	  nonvowel_stem = "STEM",
	  oblique_slots = one of {nil, "gen_p", "all", "all-oblique"},
	  oblique_vowel_stem = "STEM" or nil (only needs to be set if oblique_slots is non-nil),
	  oblique_nonvowel_stem = "STEM" or nil (only needs to be set if oblique_slots is non-nil),
	},
	...
  },
  gender = "GENDER", -- "m", "f", "n"
  number = "NUMBER", -- "sg", "pl"; may be missing
  indecl = true, -- may be missing
  manual = true, -- may be missing
  adj = true, -- may be missing
  decllemma = "DECLENSION-LEMMA", -- may be missing
  declgender = "DECLENSION-GENDER", -- may be missing
  declnumber = "DECLENSION-NUMBER", -- may be missing

  -- The following additional fields are added by other functions:
  orig_lemma = "ORIGINAL-LEMMA", -- as given by the user
  orig_lemma_no_links = "ORIGINAL-LEMMA-NO-LINKS", -- links removed
  lemma = "LEMMA", -- `orig_lemma_no_links`, converted to singular form if plural and lowercase if all-uppercase
  forms = {
	SLOT = {
	  {
		form = "FORM",
		footnotes = {"FOOTNOTE", "FOOTNOTE", ...} -- may be missing
	  },
	  ...
	},
	...
  },
  decl = "DECL", -- declension, e.g. "a-m"
  vowel_stem = "VOWEL-STEM", -- derived from vowel-ending lemmas
  nonvowel_stem = "NONVOWEL-STEM", -- derived from non-vowel-ending lemmas
}
]=]
local function parse_indicator_spec(angle_bracket_spec)
	local inside = rmatch(angle_bracket_spec, "^<(.*)>$")
	assert(inside)
	local base = {overrides = {}, forms = {}}
	if inside ~= "" then
		local segments = put.parse_balanced_segment_run(inside, "")
		local dot_separated_groups = put.split_alternating_runs_and_strip_spaces(segments, "%.")
		for i, dot_separated_group in ipairs(dot_separated_groups) do
			local part = dot_separated_group
			local case_prefix = usub(part, 1, 3)
			if cases then
				local slots, override = parse_override(dot_separated_group)
				for _, slot in ipairs(slots) do
					if base.overrides then
						error(("Two overrides specified for slot '%s'"):format(slot))
					else
						base.overrides = {override}
					end
				end
			elseif part == "" then
				if #dot_separated_group == 1 then
					error("Blank indicator: '" .. inside .. "'")
				end
				base.footnotes = fetch_footnotes(dot_separated_group)
			elseif rfind(part, "^*$") or rfind(part, "^*,") then
				if base.stem_sets then
					error("Can't specify reducible/vowel-alternant indicator twice: '" .. inside .. "'")
				end
				local comma_separated_groups = put.split_alternating_runs_and_strip_spaces(dot_separated_group, ",")
				local stem_sets = {}
				for i, comma_separated_group in ipairs(comma_separated_groups) do
					local pattern = comma_separated_group
					local orig_pattern = pattern
					local reducible, vowelalt, oblique_slots
					if pattern == "-" then
						-- default reducible, no vowel alt
					else
						local before, after
						before, reducible, after = rmatch(pattern, "^(.-)(%-?%*)(.-)$")
						if before then
							pattern = before .. after
							reducible = reducible == "*"
						end
						if pattern ~= "" then
							if not rfind(pattern, "^##?ě?$") then
								error("Unrecognized vowel-alternation pattern '" .. pattern .. "', should be one of #, ##, #ě or ##ě: '" .. inside .. "'")
							end
							if pattern == "#ě" or pattern == "##ě" then
								vowelalt = "quant-ě"
							else
								vowelalt = "quant"
							end
							-- `oblique_slots` will be later changed to "all" if the lemma ends in a consonant.
							if pattern == "##" or pattern == "##ě" then
								oblique_slots = "all-oblique"
							else
								oblique_slots = "gen_p"
							end
						end
					end
					table.insert(stem_sets, {
						reducible = reducible,
						vowelalt = vowelalt,
						oblique_slots = oblique_slots,
						footnotes = fetch_footnotes(comma_separated_group)
					})
				end
				base.stem_sets = stem_sets
			elseif #dot_separated_group > 1 then
				error("Footnotes only allowed with slot overrides, reducible or vowel alternation specs or by themselves: '" .. table.concat(dot_separated_group) .. "'")
			elseif part == "m" or part == "f" or part == "n" then
				if base.gender then
					error("Can't specify gender twice: '" .. inside .. "'")
				end
				base.gender = part
			elseif part == "sg" or part == "pl" then
				if base.number then
					error("Can't specify number twice: '" .. inside .. "'")
				end
				base.number = part
			elseif part == "astem" or part == "istem" or part == "ostem" or part == "weak" or part == "rstem" or part == "zstem" or part == "indecl" or part == "name" or part == "loc" then
				if base then
					error("Can't specify '" .. part .. "' twice: '" .. inside .. "'")
				end
				base = true
			elseif part == "+" then
				if base.adj then
					error("Can't specify '+' twice: '" .. inside .. "'")
				end
				base.adj = true
			elseif part == "!" then
				if base.manual then
					error("Can't specify '!' twice: '" .. inside .. "'")
				end
				base.manual = true
			elseif rfind(part, "^mixedistem:") then
				if base.mixedistem then
					error("Can't specify 'mixedistem:' twice: '" .. inside .. "'")
				end
				base.mixedistem = rsub(part, "^mixedistem:", "")
			elseif rfind(part, "^decllemma:") then
				if base.decllemma then
					error("Can't specify 'decllemma:' twice: '" .. inside .. "'")
				end
				base.decllemma = rsub(part, "^decllemma:", "")
			elseif rfind(part, "^declnumber:") then
				if base.declnumber then
					error("Can't specify 'declnumber:' twice: '" .. inside .. "'")
				end
				base.declnumber = rsub(part, "^declnumber:", "")
			else
				error("Unrecognized indicator '" .. part .. "': '" .. inside .. "'")
			end
		end
	end
	return base
end


local function is_regular_noun(base)
	return not base.adj and not base.pron and not base.det and not base.num
end


local function process_declnumber(base)
	base.actual_number = base.number
	if base.declnumber then
		if base.declnumber == "sg" or base.declnumber == "pl" then
			base.number = base.declnumber
		else
			error(("Unrecognized value '%s' for 'declnumber', should be 'sg' or 'pl'"):format(base.declnumber))
		end
	end
end


local function set_defaults_and_check_bad_indicators(base)
	-- Set default values.
	local regular_noun = is_regular_noun(base)
		if not base.gender then
			if base.manual then
				base.gender = "none"
			else
				error("For nouns, gender must be specified")
			end
		end
		base.number = base.number or "both"
		process_declnumber(base)
		base.actual_gender = base.gender
end


local function set_all_defaults_and_check_bad_indicators(alternant_multiword_spec)
	local is_multiword = #alternant_multiword_spec.alternant_or_word_specs > 1
	iut.map_word_specs(alternant_multiword_spec, function(base)
		set_defaults_and_check_bad_indicators(base)
		base.multiword = is_multiword -- FIXME: not currently used; consider deleting

	end)
end

-- For a plural-only lemma, synthesize a likely singular lemma. It doesn't have to be
-- theoretically correct as long as it generates all the correct plural forms.
local function synthesize_singular_lemma(base)
	if not base.stem_sets then
		base.stem_sets = {{}}
	end

	local lemma_determined
	-- Loop over all stem sets in case the user specified multiple ones (e.g. '*,-*'). If we try to reconstruct
	-- different lemmas for different stem sets, we'll throw an error below.
	for _, stems in ipairs(base.stem_sets) do
		local stem, lemma
		while true do
			if base.indecl then
				-- If specified as indeclinable, leave it alone; e.g. 'pesos' indeclinable plural of ].
				lemma = base.lemma
				break
			elseif base.gender == "m" then
				stem = rmatch(base.lemma, "^(.*)e$")
				if stem then
					lemma = stem
					break
				end
				stem = rmatch(base.lemma, "^(.*)n$")
				if stem then
					lemma = stem
					break
				end
				stem = rmatch(base.lemma, "^(.*" .. com.cons_c ")$")
				if stem then
					lemma = stem
					break
				end
				error(("Masculine plural-only lemma '%s' should end in -e or a consonant"):format(base.lemma))
			elseif base.gender == "f" then
				stem = rmatch(base.lemma, "^(.*)e$")
				if stem then
					if base.istem then
						lemma = stem
					else
					lemma = base.lemma
					end
					break
				end
				stem = rmatch(base.lemma, "^(.*)n$")
				if stem then
					lemma = stem
					break
				end
				stem = rmatch(base.lemma, "^(.*)n$")
				if stem then
					lemma = stem
					break
				end
				stem = rmatch(base.lemma, "^(.*" .. com.cons_c ")$")
				if stem then
					lemma = base.lemma
					break
				end
				error(("Feminine plural-only lemma '%s' should end in -e or a consonant"):format(base.lemma))
			elseif base.gender == "n" then
				stem = rmatch(base.lemma, "^(.*)n$")
				if stem then
					lemma = stem
					break
				end
				stem = rmatch(base.lemma, "^(.*" .. com.cons_c ")$")
				if stem then
					lemma = base.lemma
					break
				end
				error(("Neuter plural-only lemma '%s' should end in a consonant"):format(base.lemma))
			else
				error(("Internal error: Unrecognized gender '%s'"):format(base.gender))
			end
		end
		if lemma_determined and lemma_determined ~= lemma then
			error(("Attempt to set two different singular lemmas '%s' and '%s'"):format(lemma_determined, lemma))
		end
		lemma_determined = lemma
	end
	base.lemma = lemma_determined
end

-- Determine the declension based on the lemma, gender and number. The declension is set in base.decl. In the process,
-- we set either base.vowel_stem (if the lemma ends in a vowel) or base.nonvowel_stem (if the lemma does not end in a
-- vowel), which is used by determine_stems(). In some cases (specifically with certain foreign nouns), we set
-- base.lemma to a new value; this is as if the user specified 'decllemma:'.
local function determine_declension(base)
	if base.indecl then
		base.decl = "indecl"
		base.nonvowel_stem = base.lemma
		return
	end
	-- Determine declension

	stem = rmatch(base.lemma, "^(.*)e$")
	if stem then
		if base.gender == "m" then
			if base.weak then
				base.decl = "n-m"
				stem = base.lemma
			else
				base.decl = "a-m"
			end
		elseif base.gender == "f" then
			if base.weak then
				base.decl = "n-f"
				stem = base.lemma
			else
				base.decl = "o-f"
				stem = base.lemma
			end
		else
			if base.weak then
				base.decl = "n-n"
				stem = base.lemma
			else
				base.decl = "a-n"
			end
		end
		base.nonvowel_stem = stem
		return
	end
	stem = rmatch(base.lemma, "^(.*" .. com.cons_c .. ")$") or rmatch(base.lemma, "^(.*i)$") or rmatch(base.lemma, "^(.*u)$")
	if stem then
		if base.gender == "m" then
			if base.rstem then
				base.decl = "r-m"
				stem = rmatch(base.lemma, "^(.*)er$")
			elseif base.istem then
				base.decl = "i-m"
			else
				base.decl = "a-m"
			end
		elseif base.gender == "f" then
			if base.rstem then
				base.decl = "r-f"
				stem = rmatch(base.lemma, "^(.*)er$")
			elseif base.ostem then
				base.decl = "o-f"
			elseif base.weak then
				base.decl = "n-f"
			else
				base.decl = "i-f"
			end
		elseif base.gender == "n" then
			if base.zstem then
				base.decl = "z-n"
			else
				base.decl = "a-n"
			end
		end
		base.nonvowel_stem = stem
		return
	end
	error("Unrecognized ending for lemma: '" .. base.lemma .. "'")
end

-- Determine the stems to use for each stem set: vowel and nonvowel stems, for singular
-- and plural. We assume that one of base.vowel_stem or base.nonvowel_stem has been
-- set in determine_declension(), depending on whether the lemma ends in
-- a vowel. We construct all the rest given the reducibility, vowel alternation spec and
-- any explicit stems given. We store the determined stems inside of the stem-set objects
-- in `base.stem_sets`, meaning that if the user gave multiple reducible or vowel-alternation
-- patterns, we will compute multiple sets of stems. The reason is that the stems may vary
-- depending on the reducibility and vowel alternation.
local function determine_stems(base)
	if not base.stem_sets then
		base.stem_sets = {{}}
	end

	-- Now determine all the stems for each stem set.
	for _, stems in ipairs(base.stem_sets) do
		local lemma_is_vowel_stem = not not base.vowel_stem
		if base.vowel_stem then
			stems.vowel_stem = base.vowel_stem
			stems.nonvowel_stem = stems.vowel_stem
			stems.oblique_nonvowel_stem = stems.nonvowel_stem
		else
			stems.nonvowel_stem = base.nonvowel_stem
			-- The user specified #, #ě, ## or ##ě and we're dealing with a term like masculine ] or feminine
			-- ] that ends in a consonant. In this case, all slots except the nom_s and maybe acc_s have vowel
			-- alternation.
			if stems.oblique_slots then
				stems.oblique_slots = "all"
			end
			stems.oblique_nonvowel_stem = stems.nonvowel_stem
				stems.vowel_stem = base.nonvowel_stem
		end
		stems.oblique_vowel_stem = stems.vowel_stem
	end
end


local function detect_indicator_spec(base)
	if base.manual then
		if base.stem_sets then
			-- FIXME, maybe this should be allowed?
			error("Reducible and vowel alternation specs cannot be given with manual declensions")
		end
		base.stem_sets = {{reducible = false, vowel_stem = "", nonvowel_stem = ""}}
		base.decl = "manual"
	else
		if base.number == "pl" then
			synthesize_singular_lemma(base)
		end
		determine_declension(base)
		determine_stems(base)
	end
end


local function detect_all_indicator_specs(alternant_multiword_spec)
	-- Keep track of all genders seen in the singular and plural so we can determine whether to add the term to
	-- ].
	alternant_multiword_spec.sg_genders = {}
	alternant_multiword_spec.pl_genders = {}
	iut.map_word_specs(alternant_multiword_spec, function(base)
		detect_indicator_spec(base)
		if base.number ~= "pl" then
			alternant_multiword_spec.sg_genders = true
		end
		if base.number ~= "sg" then
			-- All t-stem masculines are neuter in the plural.
			local plgender
				plgender = base.actual_gender
			alternant_multiword_spec.pl_genders = true
		end
	end)
end


local propagate_multiword_properties


local function propagate_alternant_properties(alternant_spec, property, mixed_value, nouns_only)
	local seen_property
	for _, multiword_spec in ipairs(alternant_spec.alternants) do
		propagate_multiword_properties(multiword_spec, property, mixed_value, nouns_only)
		if seen_property == nil then
			seen_property = multiword_spec
		elseif multiword_spec and seen_property ~= multiword_spec then
			seen_property = mixed_value
		end
	end
	alternant_spec = seen_property
end


propagate_multiword_properties = function(multiword_spec, property, mixed_value, nouns_only)
	local seen_property = nil
	local last_seen_nounal_pos = 0
	local word_specs = multiword_spec.alternant_or_word_specs or multiword_spec.word_specs
	for i = 1, #word_specs do
		local is_nounal
		if word_specs.alternants then
			propagate_alternant_properties(word_specs, property, mixed_value)
			is_nounal = not not word_specs
		elseif nouns_only then
			is_nounal = is_regular_noun(word_specs)
		else
			is_nounal = not not word_specs
		end
		if is_nounal then
			if not word_specs then
				error("Internal error: noun-type word spec without " .. property .. " set")
			end
			for j = last_seen_nounal_pos + 1, i - 1 do
				word_specs = word_specs or word_specs
			end
			last_seen_nounal_pos = i
			if seen_property == nil then
				seen_property = word_specs
			elseif seen_property ~= word_specs then
				seen_property = mixed_value
			end
		end
	end
	if last_seen_nounal_pos > 0 then
		for i = last_seen_nounal_pos + 1, #word_specs do
			word_specs = word_specs or word_specs
		end
	end
	multiword_spec = seen_property
end


local function propagate_properties_downward(alternant_multiword_spec, property, default_propval)
	local function set_and_fetch(obj, default)
		local retval
		if obj then
			retval = obj
		else
			obj = default
			retval = default
		end
		if not obj then
			obj = retval
		end
		return retval
	end
	local propval1 = set_and_fetch(alternant_multiword_spec, default_propval)
	for _, alternant_or_word_spec in ipairs(alternant_multiword_spec.alternant_or_word_specs) do
		local propval2 = set_and_fetch(alternant_or_word_spec, propval1)
		if alternant_or_word_spec.alternants then
			for _, multiword_spec in ipairs(alternant_or_word_spec.alternants) do
				local propval3 = set_and_fetch(multiword_spec, propval2)
				for _, word_spec in ipairs(multiword_spec.word_specs) do
					local propval4 = set_and_fetch(word_spec, propval3)
					if propval4 == "mixed" then
						-- FIXME, use clearer error message.
						error("Attempt to assign mixed " .. property .. " to word")
					end
					set_and_fetch(word_spec, propval4)
				end
			end
		else
			if propval2 == "mixed" then
				-- FIXME, use clearer error message.
				error("Attempt to assign mixed " .. property .. " to word")
			end
			set_and_fetch(alternant_or_word_spec, propval2)
		end
	end
end


--[=[
Propagate `property` (one of "gender" or "number") from nouns to adjacent
adjectives. We proceed as follows:
1. We assume the properties in question are already set on all nouns. This should happen in
   set_defaults_and_check_bad_indicators().
2. We first propagate properties upwards and sideways. We recurse downwards from the top. When we encounter a multiword
   spec, we proceed left to right looking for a noun. When we find a noun, we fetch its property (recursing if the noun
   is an alternant), and propagate it to any adjectives to its left, up to the next noun to the left. When we have
   processed the last noun, we also propagate its property value to any adjectives to the right (to handle e.g.
   ] "guardian angel", where the adjective ] should inherit the 'masculine' and 'animate'
   properties of ]). Finally, we set the property value for the multiword spec itself by combining all the
   non-nil properties of the individual elements. If all non-nil properties have the same value, the result is that
   value, otherwise it is `mixed_value` (which is "mixed" for gender, but "both" for number).
3. When we encounter an alternant spec in this process, we recursively process each alternant (which is a multiword
   spec) using the previous step, and combine any non-nil properties we encounter the same way as for multiword specs.
4. The effect of steps 2 and 3 is to set the property of each alternant and multiword spec based on its children or its
   neighbors.
]=]
local function propagate_properties(alternant_multiword_spec, property, default_propval, mixed_value)
	propagate_multiword_properties(alternant_multiword_spec, property, mixed_value, "nouns only")
	propagate_multiword_properties(alternant_multiword_spec, property, mixed_value, false)
	propagate_properties_downward(alternant_multiword_spec, property, default_propval)
end


local function determine_noun_status(alternant_multiword_spec)
	for i, alternant_or_word_spec in ipairs(alternant_multiword_spec.alternant_or_word_specs) do
		if alternant_or_word_spec.alternants then
			local is_noun = false
			for _, multiword_spec in ipairs(alternant_or_word_spec.alternants) do
				for j, word_spec in ipairs(multiword_spec.word_specs) do
					if is_regular_noun(word_spec) then
						multiword_spec.first_noun = j
						is_noun = true
						break
					end
				end
			end
			if is_noun then
				alternant_multiword_spec.first_noun = i
			end
		elseif is_regular_noun(alternant_or_word_spec) then
			alternant_multiword_spec.first_noun = i
			return
		end
	end
end


-- Set the part of speech based on properties of the individual words.
local function set_pos(alternant_multiword_spec)
	if alternant_multiword_spec.args.pos then
		alternant_multiword_spec.pos = alternant_multiword_spec.args.pos
	else
		alternant_multiword_spec.pos = "noun"
	end
	alternant_multiword_spec.plpos = require(en_utilities_module).pluralize(alternant_multiword_spec.pos)
end


local function normalize_all_lemmas(alternant_multiword_spec, pagename)
	iut.map_word_specs(alternant_multiword_spec, function(base)
		if base.lemma == "" then
			base.lemma = pagename
		end
		base.orig_lemma = base.lemma
		base.orig_lemma_no_links = m_links.remove_links(base.lemma)
		local lemma = base.orig_lemma_no_links
		-- If the lemma is all-uppercase, lowercase it but note this, so that later in combine_stem_ending() we convert it
		-- back to uppercase. This allows us to handle all-uppercase acronyms without a lot of extra complexity.
		-- FIXME: This may not make sense at all.
		if uupper(lemma) == lemma then
			base.all_uppercase = true
			lemma = ulower(lemma)
		end
		base.actual_lemma = lemma
		base.lemma = base.decllemma or lemma
	end)
end


local function decline_noun(base)
	for _, stems in ipairs(base.stem_sets) do
		if not decls then
			error("Internal error: Unrecognized declension type '" .. base.decl .. "'")
		end
		decls(base, stems)
	end
	handle_derived_slots_and_overrides(base)
	local function copy(from_slot, to_slot)
		base.forms = base.forms
	end
	
	if base.actual_number ~= base.number then
		local source_num = base.number == "sg" and "_s" or "_p"
		local dest_num = base.number == "sg" and "_p" or "_s"
		for case, _ in pairs(cases) do
			copy(case .. source_num, case .. dest_num)
			copy("nom" .. source_num .. "_linked", "nom" .. dest_num .. "_linked")
		end
		if base.actual_number ~= "both" then
			local erase_num = base.actual_number == "sg" and "_p" or "_s"
			for case, _ in pairs(cases) do
				base.forms = nil
			end
			base.forms = nil
		end
	end
end


local function get_variants(form)
	return nil
	--[=[
	FIXME
	return
		form:find(com.VAR1) and "var1" or
		form:find(com.VAR2) and "var2" or
		form:find(com.VAR3) and "var3" or
		nil
	]=]
end


-- Compute the categories to add the noun to, as well as the annotation to display in the
-- declension title bar. We combine the code to do these functions as both categories and
-- title bar contain similar information.
local function compute_categories_and_annotation(alternant_multiword_spec)
	local all_cats = {}
	local function insert(cattype)
		m_table.insertIfNot(all_cats, "Middle High German " .. cattype)
	end
	if alternant_multiword_spec.pos == "noun" then
		if alternant_multiword_spec.actual_number == "sg" then
			insert("uncountable nouns")
		elseif alternant_multiword_spec.actual_number == "pl" then
			insert("pluralia tantum")
		end
	end
	local annotation
	local annparts = {}
	local decldescs = {}
	local vowelalts = {}
	local foreign = {}
	local irregs = {}
	local stemspecs = {}
	local reducible = nil
	local function get_genanim(gender)
		local gender_code_to_desc = {
			m = "masculine",
			f = "feminine",
			n = "neuter",
			none = nil,
		}
		local descs = {}
		table.insert(descs, gender_code_to_desc)
		return table.concat(descs, " ")
	end

	local function trim(text)
		text = text:gsub(" +", " ")
		return mw.text.trim(text)
	end

	local function do_word_spec(base)
		local genanim = get_genanim(base.actual_gender)
		for _, stems in ipairs(base.stem_sets) do
			local props = declprops
			local cats = props.cat
			if type(cats) == "function" then
				cats = cats(base, stems)
			end
			if type(cats) == "string" then
				cats = {cats}
			end
			local default_desc
			for i, cat in ipairs(cats) do
				if not cat:find("GENDER") and not cat:find("GENPOS") and not cat:find("POS") then
					cat = cat
				end
				cat = cat:gsub("GENPOS", "GENDER POS")
				if not cat:find("POS") then
					cat = cat .. " POS"
				end
				if i == #cats then
					default_desc = cat:gsub(" POS", "")
				end
				cat = cat:gsub("GENDER", genanim)
				cat = cat:gsub("POS", alternant_multiword_spec.plpos)
				-- Need to trim `cat` because actual_genanim may be an empty string.
				insert(trim(cat))
			end

			local desc = props.desc
			if type(desc) == "function" then
				desc = desc(base, stems)
			end
			desc = desc or default_desc
			desc = desc:gsub("GENDER", genanim)
			-- Need to trim `desc` because genanim may be an empty string.
			m_table.insertIfNot(decldescs, trim(desc))

			local vowelalt
			if stems.vowelalt == "quant" then
				vowelalt = "quant-alt"
				insert("nouns with quantitative vowel alternation")
			elseif stems.vowelalt == "quant-ě" then
				vowelalt = "í-ě-alt"
				insert("nouns with í-ě alternation")
			end
			if vowelalt then
				m_table.insertIfNot(vowelalts, vowelalt)
			end
			m_table.insertIfNot(stemspecs, stems.vowel_stem)
		end
	end
	local key_entry = alternant_multiword_spec.first_noun or 1
	if #alternant_multiword_spec.alternant_or_word_specs >= key_entry then
		local alternant_or_word_spec = alternant_multiword_spec.alternant_or_word_specs
		if alternant_or_word_spec.alternants then
			for _, multiword_spec in ipairs(alternant_or_word_spec.alternants) do
				key_entry = multiword_spec.first_noun or 1
				if #multiword_spec.word_specs >= key_entry then
					do_word_spec(multiword_spec.word_specs)
				end
			end
		else
			do_word_spec(alternant_or_word_spec)
		end
	end
	if alternant_multiword_spec.actual_number == "sg" or alternant_multiword_spec.actual_number == "pl" then
		-- not "both" or "none" (for ])
		table.insert(annparts, alternant_multiword_spec.actual_number == "sg" and "sg-only" or "pl-only")
	end
	if #decldescs == 0 then
		table.insert(annparts, "indecl")
	else
		table.insert(annparts, table.concat(decldescs, " // "))
	end
	if #vowelalts > 0 then
		table.insert(annparts, table.concat(vowelalts, "/"))
	end
	if #irregs > 0 then
		table.insert(annparts, table.concat(irregs, " // "))
	end
	alternant_multiword_spec.annotation = table.concat(annparts, " ")
	if #stemspecs > 1 then
		insert("nouns with multiple stems")
	end
	if alternant_multiword_spec.actual_number == "both" and not m_table.deepEquals(alternant_multiword_spec.sg_genders, alternant_multiword_spec.pl_genders) then
		insert("nouns that change gender in the plural")
	end
	alternant_multiword_spec.categories = all_cats
end


local function show_forms(alternant_multiword_spec)
	local lemmas = {}
	for _, slot in ipairs(potential_lemma_slots) do
		if alternant_multiword_spec.forms then
			for _, formobj in ipairs(alternant_multiword_spec.forms) do
				-- FIXME, now can support footnotes as qualifiers in headwords?
				table.insert(lemmas, formobj.form)
			end
			break
		end
	end
	local props = {
		lemmas = lemmas,
		slot_table = alternant_multiword_spec.output_noun_slots,
		lang = lang,
		canonicalize = function(form)
			-- return com.remove_variant_codes(form)
			return form
		end,
	}
	iut.show_forms(alternant_multiword_spec.forms, props)
end


local function make_table(alternant_multiword_spec)
	local forms = alternant_multiword_spec.forms

	local function template_prelude(min_width)
		return rsub([=[
<div>
<div class="NavFrame" style="display: inline-block; min-width: MINWIDTHem">
<div class="NavHead">{title}{annotation}</div>
<div class="NavContent">
{\op}| border="1px solid #505050" style="border-collapse:collapse; background:#FAFAFA; text-align:center; width:100%" class="inflection-table"
|-
]=], "MINWIDTH", min_width)
	end

	local function template_postlude()
		return [=[
|{\cl}{notes_clause}</div></div></div>]=]
	end

	local table_spec_both = template_prelude("45") .. [=[
! style="background:#AAB8C0;width:15%" |
! colspan="3" style="background:#AAB8C0;width:46%" | singular
! colspan="2" style="background:#AAB8C0;width:39%" | plural
|-
! style="background:#BBC9D0" |
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:32%" | noun
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:32%" | noun
|-
! style="background:#BBC9D0" | nominative
| style="background:#EEEEEE" | ]
| style="background:#EEEEEE" | {art_def_nom_s}
| {nom_s}
| style="background:#EEEEEE" | {art_def_nom_p}
| {nom_p}
|-
! style="background:#BBC9D0" | genitive
| style="background:#EEEEEE" | {art_ind_gen_s}
| style="background:#EEEEEE" | {art_def_gen_s}
| {gen_s}
| style="background:#EEEEEE" | ]
| {gen_p}
|-
! style="background:#BBC9D0" | dative
| style="background:#EEEEEE" | {art_ind_dat_s}
| style="background:#EEEEEE" | {art_def_dat_s}
| {dat_s}
| style="background:#EEEEEE" | ]
| {dat_p}
|-
! style="background:#BBC9D0" | accusative
| style="background:#EEEEEE" | {art_ind_acc_s}
| style="background:#EEEEEE" | {art_def_acc_s}
| {acc_s}
| style="background:#EEEEEE" | {art_def_nom_p}
| {nom_p}
]=] .. template_postlude()

		local table_spec_singular = template_prelude("45") .. [=[
! style="background:#AAB8C0;width:15%" |
! colspan="3" style="background:#AAB8C0;width:46%" | singular
|-
! style="background:#BBC9D0" |
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:32%" | noun
|-
! style="background:#BBC9D0" | nominative
| style="background:#EEEEEE" | ]
| style="background:#EEEEEE" | {art_def_nom_s}
| {nom_s}
|-
! style="background:#BBC9D0" | genitive
| style="background:#EEEEEE" | {art_ind_gen_s}
| style="background:#EEEEEE" | {art_def_gen_s}
| {gen_s}
|-
! style="background:#BBC9D0" | dative
| style="background:#EEEEEE" | {art_ind_dat_s}
| style="background:#EEEEEE" | {art_def_dat_s}
| {dat_s}
|-
! style="background:#BBC9D0" | accusative
| style="background:#EEEEEE" | {art_ind_acc_s}
| style="background:#EEEEEE" | {art_def_acc_s}
| {acc_s}
]=] .. template_postlude()

		local table_spec_plural = template_prelude("45") .. [=[
! style="background:#AAB8C0;width:15%" |
! colspan="2" style="background:#AAB8C0;width:46%" | plural
|-
! style="background:#BBC9D0" |
! style="background:#BBC9D0;width:7%" | ]
! style="background:#BBC9D0;width:32%" | noun
|-
! style="background:#BBC9D0" | nominative
| style="background:#EEEEEE" | {art_def_nom_p}
| {nom_p}
|-
! style="background:#BBC9D0" | genitive
| style="background:#EEEEEE" | ]
| {gen_p}
|-
! style="background:#BBC9D0" | dative
| style="background:#EEEEEE" | ]
| {dat_p}
|-
! style="background:#BBC9D0" | accusative
| style="background:#EEEEEE" | {art_def_nom_p}
| {nom_p}
]=] .. template_postlude()

	local notes_template = [=[
<div style="width:100%;text-align:left;background:#d9ebff">
<div style="display:inline-block;text-align:left;padding-left:1em;padding-right:1em">
{footnote}
</div></div>
]=]

	if alternant_multiword_spec.gender == "m" then
	forms.art_ind_gen_s = "]"
	forms.art_ind_dat_s = "]"
	forms.art_ind_acc_s = "]"
	forms.art_def_nom_s = "]"
	forms.art_def_gen_s = "]"
	forms.art_def_dat_s = "]"
	forms.art_def_acc_s = "]"
	forms.art_def_nom_p = "]"
	elseif alternant_multiword_spec.gender == "f" then
	forms.art_ind_gen_s = "]"
	forms.art_ind_dat_s = "]"
	forms.art_ind_acc_s = "]"
	forms.art_def_nom_s = "]"
	forms.art_def_gen_s = "]"
	forms.art_def_dat_s = "]"
	forms.art_def_acc_s = "]"
	forms.art_def_nom_p = "]"
	else
	forms.art_ind_gen_s = "]"
	forms.art_ind_dat_s = "]"
	forms.art_ind_acc_s = "]"
	forms.art_def_nom_s = "]"
	forms.art_def_gen_s = "]"
	forms.art_def_dat_s = "]"
	forms.art_def_acc_s = "]"
	forms.art_def_nom_p = "]"
	end
	
	if alternant_multiword_spec.title then
		forms.title = alternant_multiword_spec.title
	else
		forms.title = 'Declension of <i lang="gmh">' .. forms.lemma .. '</i>'
	end

	local annotation = alternant_multiword_spec.annotation
	if annotation == "" then
		forms.annotation = ""
	else
		forms.annotation = " (<span style=\"font-size: smaller;\">" .. annotation .. "</span>)"
	end

	local number, numcode
	if alternant_multiword_spec.actual_number == "sg" then
		number, numcode = "singular", "s"
	elseif alternant_multiword_spec.actual_number == "pl" then
		number, numcode = "plural", "p"
	elseif alternant_multiword_spec.actual_number == "none" then -- used for ]
		number, numcode = "", "s"
	end

	local table_spec =
		alternant_multiword_spec.actual_number == "both" and table_spec_both or alternant_multiword_spec.actual_number == "sg" and table_spec_singular or table_spec_plural
	forms.notes_clause = forms.footnote ~= "" and
		m_string_utilities.format(notes_template, forms) or ""
	return m_string_utilities.format(table_spec, forms)
end


local function compute_headword_genders(alternant_multiword_spec)
	local genders = {}
	local number
	if alternant_multiword_spec.actual_number == "pl" then
		number = "-p"
	else
		number = ""
	end
	iut.map_word_specs(alternant_multiword_spec, function(base)
		m_table.insertIfNot(genders, base.gender .. "-" .. number)
	end)
	return genders
end


-- Externally callable function to parse and decline a noun given user-specified arguments.
-- Return value is ALTERNANT_MULTIWORD_SPEC, an object where the declined forms are in
-- `ALTERNANT_MULTIWORD_SPEC.forms` for each slot. If there are no values for a slot, the
-- slot key will be missing. The value for a given slot is a list of objects
-- {form=FORM, footnotes=FOOTNOTES}.
function export.do_generate_forms(parent_args, from_headword)
	local params = {
		 = {required = true, default = "bóh<m.an.#>"},
		title = {},
		pagename = {},
		json = {type = "boolean"},
		pos = {},
	}

	if from_headword then
		params = {list = true}
		params = {list = true}
		params = {list = true}
		params = {list = true}
		params = {list = true}
		params = {list = true}
		params = {list = true}
		params = {}
	end

	local args = m_para.process(parent_args, params)
	local parse_props = {
		parse_indicator_spec = parse_indicator_spec,
		angle_brackets_omittable = true,
		allow_blank_lemma = true,
	}
	local alternant_multiword_spec = iut.parse_inflected_text(args, parse_props)
	alternant_multiword_spec.title = args.title
	alternant_multiword_spec.args = args
	local pagename = args.pagename or from_headword and args.head or mw.title.getCurrentTitle().subpageText
	normalize_all_lemmas(alternant_multiword_spec, pagename)
	set_all_defaults_and_check_bad_indicators(alternant_multiword_spec)
	-- These need to happen before detect_all_indicator_specs() so that adjectives get their genders and numbers set
	-- appropriately, which are needed to correctly synthesize the adjective lemma.
	propagate_properties(alternant_multiword_spec, "number", "both", "both")
	-- FIXME, the default value (third param) used to be 'm' with a comment indicating that this applied only to
	-- plural adjectives, where it didn't matter; but in Czech, plural adjectives are distinguished for gender. Make sure 'mixed' works.
	propagate_properties(alternant_multiword_spec, "gender", "mixed", "mixed")
	detect_all_indicator_specs(alternant_multiword_spec)
	-- Propagate 'actual_number' after calling detect_all_indicator_specs(), which sets 'actual_number' for adjectives.
	propagate_properties(alternant_multiword_spec, "actual_number", "both", "both")
	determine_noun_status(alternant_multiword_spec)
	set_pos(alternant_multiword_spec)
	alternant_multiword_spec.output_noun_slots = get_output_noun_slots(alternant_multiword_spec)
	local inflect_props = {
		skip_slot = function(slot)
			return skip_slot(alternant_multiword_spec.actual_number, slot)
		end,
		slot_table = alternant_multiword_spec.output_noun_slots,
		get_variants = get_variants,
		inflect_word_spec = decline_noun,
	}
	iut.inflect_multiword_or_alternant_multiword_spec(alternant_multiword_spec, inflect_props)
	compute_categories_and_annotation(alternant_multiword_spec)
	alternant_multiword_spec.genders = compute_headword_genders(alternant_multiword_spec)
	if args.json then
		alternant_multiword_spec.args = nil
		return require("Module:JSON").toJSON(alternant_multiword_spec)
	end
	return alternant_multiword_spec
end


-- Entry point for {{gmh-ndecl}}. Template-callable function to parse and decline a noun given
-- user-specified arguments and generate a displayable table of the declined forms.
function export.show(frame)
	local parent_args = frame:getParent().args
	local alternant_multiword_spec = export.do_generate_forms(parent_args)
	if type(alternant_multiword_spec) == "string" then
		-- JSON return value
		return alternant_multiword_spec
	end
	show_forms(alternant_multiword_spec)
	return make_table(alternant_multiword_spec) ..
		require("Module:utilities").format_categories(alternant_multiword_spec.categories, lang, nil, nil, force_cat)
end


return export