Module:Class mask

local p = {}
local ucfirst = function(s)
	return s:sub(1, 1):upper() .. s:sub(2, -1)
end

local inlist = function(string, list)
	for _, s in ipairs(list) do
		if s==string then
			return true
		end
	end
	return false
end

p._main = function(args, title)
	local resolveFQSgrade = function(grade)
		if (args[grade] or args.FQS)=='yes' then
			return ucfirst(grade)
		else
			return 'NA'
		end
	end
	local page = title and title.prefixedText
	local out = ''
	local grade = args[1]
	if not grade or grade == '¬' then -- undefined
		out = '¬'
	else
		local pagetype = require('Module:Pagetype')._main{
			dab = 'dab',
			sia = 'sia',
			portal = 'yes',
			wikipedia = 'yes',
			draft = 'yes',
			timedtext = 'yes',
			help = 'yes',
			user = 'yes',
			page = page
		}
		grade = grade:match('^%s*(.-)%s*$'):lower()
		if pagetype=='redirect' then
			out = resolveFQSgrade('redirect')
		elseif pagetype=='dab' then
			out = resolveFQSgrade('disambig')
		elseif pagetype=='article' then
			if inlist(grade, {'start', 'stub'}) and args[grade]~='no' then
				out = ucfirst(grade)
			elseif inlist(grade, {'b', 'c', 'fa', 'fl', 'a', 'ga'}) and args[grade]~='no' then
				out = grade:upper()
			elseif args[grade:upper()] then -- upper-case syntax
				out = args[grade:upper()]
			elseif args[grade:lower()]=='yes' then -- lower-case syntax
				out = mw.language.getContentLanguage():ucfirst(grade:lower())
			elseif inlist(grade, {'list', 'sia', 'si', 'sl'}) and args['list']~='no' then
				out = 'List'
			end
		elseif pagetype=='sia' then
				out = 'List'
		elseif inlist(pagetype, {'file', 'Timed Text page'}) then
			if grade=='fm' and (args.fm or args.FQS)=='yes' then
				out = 'FM'
			else
				out = resolveFQSgrade('file')
			end
		elseif pagetype=='category' then
			out = resolveFQSgrade('category')
		elseif pagetype=='portal' then
			out = resolveFQSgrade('portal')
		elseif pagetype=='template' or pagetype=='module' then
			out = resolveFQSgrade('template')
		elseif pagetype=='project page' then
			out = resolveFQSgrade('project')
		elseif pagetype=='draft' then
			out = resolveFQSgrade('draft')
		elseif pagetype=='help page' and args['help']=='yes' then
			out = 'Help'
		elseif pagetype=='user page' and args['user']=='yes' then
			out = 'User'
		else
			out = 'NA'
		end
	end
	return out
end

p.main = function(frame)
	local getArgs = require('Module:Arguments').getArgs
	local args = getArgs(frame, {
		removeBlanks = false,
		wrappers = 'Template:Class mask'
	})
	return p._main(args)
end

return p