模組:Namespace

local p = {}

local function lan (args, lang)
	-- from [[Module:Lan]]
	local userlanguage = lang or mw.getCurrentFrame():callParserFunction{ name = 'int', args = {'Conversionname'} }
	local fallbackList = require('Module:Lan').fallbackList
	local fallback = fallbackList[userlanguage]
	if fallback == nil then
		fallback = fallbackList['zh']
	end
	for _,langArgName in ipairs(fallback)  do
		if 	args[langArgName] ~= nil then
			return args[langArgName]
		end
	end
	return ''
end

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

function p._main (args)
	local lang = args[1]:lower() or mw.getCurrentFrame():callParserFunction{ name = 'int', args = {'Conversionname'} }
	local arg = args[2]
	local nsid
	local isTalk = false
	if arg then
		if arg == '' then
			nsid = -3
		else
			local nsid_info = mw.site.namespaces[tonumber(arg)] or mw.site.namespaces[arg]
			if not nsid_info then
				nsid = -3
			else
				nsid = nsid_info.id
			end
			
		end
	else
		nsid = mw.title.getCurrentTitle().namespace
	end
	if nsid < -2 then
		return tostring(mw.html.create('span'):attr('style', 'color:red;'):wikitext(
			lan ({
				['zh'] = 'Input namespace error',
				['zh-hans'] = '输入名字空间错误',
				['zh-hant'] = '輸入命名空間錯誤'
			}, lang)
		):done())
	elseif mw.site.talkNamespaces[nsid] then
		nsid = nsid - 1
		isTalk = true
	end
	return 
		mw.message.new('nstab-' .. ifempty(mw.site.namespace[nsid].canonicalName:lower(), 'main')):inLanguage(lang):plain() .. 
		(isTalk and mw.message.new('talk'):inLanguage(lang):plain() or '')
end

function p.main (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
	})
	return p._main(args)
end

return p