编辑“︁Module:Namespace”︁

local p = {}
local data = mw.loadData('Module:Namespace/data')
local mLan = require('Module:Lan2')

local function Error(msg)
	return mError.error { '[[Module:Namespace]]錯誤：' .. msg }
end

local function ifempty(ret, val)
	return ret ~= '' and ret or val
end

local function inArray(str, arr)
	for i, v in ipairs(arr) do
		if str == v then
			return v
		end
	end
	return nil
end

function p._lan(args, lang)
	return mLan.main(args,
		ifempty(lang and lang:lower(), mw.getCurrentFrame():callParserFunction { name = 'int', args = { 'Lang' } }), {
		['def'] = { 'en' }
	})
end

function p._isNamespace(id)
	id = tostring(id)
	local PNS, _PNSIsTalk = p._isPseudoNamespace(id)
	return
		PNS
		or mw.site.namespaces[tonumber(id) or id:lower()] and mw.site.namespaces[tonumber(id) or id:lower()].id
		or nil
end

function p.namespace(frame)
	local args
	if frame == mw.getCurrentFrame() then
		-- We're being called via #invoke. The args are passed through to the module
		-- from the template page, so use the args that were passed into the template.
		if not getArgs then
			getArgs = require('Module:Arguments').getArgs
		end
		args = getArgs(frame, { parentFirst = true })
	else
		-- We're being called from another module or from the debug console, so assume
		-- the args are passed in directly.
		args = frame
		if type(args) ~= type({}) then args = { frame } end
	end
	id = tostring(args.namespace or args[1])
	local PNS, _PNSIsTalk = p._isPseudoNamespace()
	return (PNS or mw.title.getCurrentTitle().namespace) == p._isNamespace(id) and (args['then'] or args[2]) or (args['else'] or args[3])
end

local MsgCallFunc = {
	['NamespacesDisplay'] = (function(nsid)
		return data.Namespace[tostring(nsid)]
	end),
	['NamespacesConversionDisplay'] = (function(nsid)
		return data.Namespace[tostring(nsid) .. '-display'] or data.Namespace[tostring(nsid)]
	end),
}

function p._PseudoNamespaceDisplay(lang, ns, isTalk)
	if not inArray(ns, data['PseudoNamespace']['list']) then
		error('Input pseudo namespace error.')
	end

	local display = p._lan(data.PseudoNamespace.messages[isTalk and 'talk' or 'main'], lang)
	display = mw.ustring.gsub(display, '$1', p._lan(data.PseudoNamespace[ns], lang))
	return display
end

for key, func in pairs(MsgCallFunc) do
	p['_' .. key] = function(lang, ns)
		if type(lang) == 'table' then
			ns = lang[2]
			lang = lang[1]
		end
		local PNS, PNSIsTalk
		local lang = lang
		local nsid
		if ns then
			if ns == '' then
				nsid = -3
			else
				local nsid_info = mw.site.namespaces[tonumber(ns)] or mw.site.namespaces[ns]
				if not nsid_info then
					PNS, PNSIsTalk = p._isPseudoNamespace(ns, false)
					nsid = -3
				else
					nsid = nsid_info.id
				end
			end
		else
			local title = mw.title.getCurrentTitle()
			nsid = title.namespace
			if nsid == 0 or nsid == 1 then
				PNS, PNSIsTalk = p._isPseudoNamespace(title, true)
			end
		end
		if PNS then
			return p._pseudoNamespaceDisplay(lang, PNS, PNSIsTalk)
		elseif nsid < -2 then
			error('Input namespace error.')
		end
		return p._lan(MsgCallFunc[key](nsid), lang)
	end

	p[key] = function(frame)
		local args = require('Module:Arguments').getArgs(frame, {
			valueFunc = function(key, value)
				if key == 2 then
					return type(value) == 'string' and mw.text.trim(value) or value
				elseif value then
					value = mw.text.trim(value)
					if value ~= '' then
						return value
					end
				end
				return nil
			end
		})
		local statue, wt = pcall(p['_' .. key], args)
		if statue then
			return wt
		end
		return tostring(mw.html.create('span'):attr('style', 'color:red;'):wikitext(
			p._lan({
				['en'] = 'Input namespace error',
				['zh-hans'] = '输入命名空间错误',
				['zh-hant'] = '輸入命名空間錯誤'
			}, lang)
		):done())
	end
end

function p._isPseudoNamespace(ns, isPage)
	if not ns then
		ns = mw.title.getCurrentTitle()
		isPage = true
	elseif ns == '' then
		return nil, false
	end

	local success, titleObj
	if type(ns) == type('') then
		if not ns:match(':') then
			ns = ns .. ':'
		end
		success, titleObj = pcall(mw.title.new, ns)
		if not success or not titleObj or not titleObj:inNamespaces(0, 1) then
			return nil, false
		end
		
		local split = mw.text.split(titleObj.text, ':')
		if not isPage and (#split > 2 or (split[2] ~= '' and split[2] ~= nil)) then
			-- isPage = false 時僅允許：
			-- 1. PNS
			-- 2. PNS:
			return nil, false
		end
		ns = split[1] -- 移除冒號後的東西
	elseif type(ns) == type({}) and type(ns.text) == type('') and isPage then
		-- 如果傳入頁面物件，則 isPage 必然要是 true
		if not ns:inNamespaces(0, 1) then
			return nil, false
		end

		ns = mw.text.split(ns.text, ':')[1] -- 移除冒號後的東西
	else
		error(string.format(
			'bad argument #1 to \'_isPseudoNamespace[isPage=%s]\' (%s expected, got %s)',
			isPage and 'true' or 'false',
			isPage and 'string or mw.title object' or 'string',
			type(ns)
		))
	end
	if inArray(ns, data['PseudoNamespace']['list']) then
		return ns, titleObj.namespace == 1
	end
	return nil, false
end

function p.ispseudo(frame)
	local arg = require('Module:Arguments').getArgs(frame)['1']
	local PNS, _isTalk = p._isPseudoNamespace(arg, true)
	return PNS or ''
end

p._PNSArray = data['PseudoNamespace']['list']

return p