local p = {}

local words = mw.loadData('Module:A or an/words')



local lcVChars = 'aeiouà-æè-ïò-öø-üāăąēĕėęěĩīĭįıijōŏőœũūŭůűų'

local ucVvChars = 'AEFHILMNORSXÀ-ÆÈ-ÏÒ-ÖØĀĂĄĒĔĖĘĚĨĪĬĮıIJŌŎŐŒÑĤĦĹĻĽĿŁŃŅŇŊŔŖŘŚŜŞ'



local function findWord(s, t)

	for i, v in ipairs(t) do

		if mw.ustring.find(s, '^' .. v .. '$') then

			return true

		end

	end

end



function p._main(args)

	local s = args1 and mw.text.trim(args1])

	local pron = 'a'

	local ret = ''

	

	if s and s ~= '' then

		local origStr = s

		

		s = mw.ustring.gsub(s, '</?[A-Za-z][^>]->', '') -- Remove HTML tags

		s = mw.ustring.gsub(s, '%[%[[^%|]+%|(..-)%]%]', '%1') -- Remove wikilinks

		s = mw.ustring.gsub(mw.ustring.gsub(s, '%[%[', ''), '%]%]', '')

		s = mw.ustring.gsub(s, '^["%$\'%(<%[%{¢-¥₠-₿]+', '') -- Strip some symbols at the beginning

		s = mw.ustring.match(s, '^%.?[0-9%u%l]+') or s -- Extract the first word

		

		if mw.ustring.find(s, '^[0-9]') then -- It begins with a number

			s = mw.ustring.match(s, '^[0-9]+') -- Extract the number

			if findWord(s, words.vNums) then -- '18' etc.

				pron = 'an'

			end

		elseif mw.ustring.match(s, '^[0-9%u]+$') then -- It looks like an acronym

			if mw.ustring.find(s, '^[' .. ucVvChars .. ']')

				and not findWord(s, words.cvAcronyms) -- Exclude 'NASA' etc.

				or findWord(s, words.vvAcronyms) -- 'UNRWA' etc.

			then

				pron = 'an'

			end

		else

			s = mw.ustring.lower(s) -- Uncapitalize

			if mw.ustring.find(s, '^['.. lcVChars .. ']') then -- It begins with a vowel

				if not findWord(s, words.vcWords) -- Exclude 'euro' etc.

					or findWord(s, words.vvWords) -- But not 'Euler' etc.

				then

					pron = 'an'

				end

			elseif args.variety and mw.ustring.lower(args.variety) == 'us' -- 'herb' etc.

				and findWord(s, words.cvWordsUS)

				or findWord(s, words.cvWords) -- 'hour' etc.

			then

				pron = 'an'

			end

		end

		ret = pron .. ' ' .. origStr

	end

	

	return ret

end



function p.main(frame)

	return p._main(frame:getParent().args)

end



return p