Module:A or an/sandbox explained

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 article =

local function findWord(text, array) for _, v in ipairs(array) do if mw.ustring.find(text, '^' .. v .. '$') then return true end endend

local function get_article_from_acronym(text) if mw.ustring.find(text, '^[' .. ucVvChars .. ']') and not findWord(text, words.cvAcronyms) -- Exclude 'NASA' etc. or findWord(text, words.vvAcronyms) -- 'UNRWA' etc. then return article.an end return article.aend

local function get_article_from_number_word(text) text = mw.ustring.match(text, '^[0-9]+') -- Extract the number if findWord(text, words.vNums) then -- '18' etc. return article.an end return article.aend

local function clean_text(text) text = mw.ustring.gsub(text, '', ) -- Remove HTML tags text = mw.ustring.gsub(text, '%[%[[^%|]+%|(..-)%]%]', '%1') -- Remove wikilinks text = mw.ustring.gsub(mw.ustring.gsub(text, '%[%[', ''), '%]%]', ) text = mw.ustring.gsub(text, '^["%$\'%(<%[%{¢-¥₠-₿]+', ) -- Strip some symbols at the beginning text = mw.ustring.match(text, '^%.?[0-9%u%l]+') or text -- Extract the first word return textend

function p._main(args) local original_text = args[1] and mw.text.trim(args[1]) local text = original_text local article = article.a local ret =

if text and text ~= then text = clean_text(text)

if mw.ustring.find(text, '^[0-9]') then -- It begins with a number article = get_article_from_number_word(text) elseif mw.ustring.match(text, '^[0-9%u]+$') then -- It looks like an acronym article = get_article_from_acronym(text) else text = mw.ustring.lower(text) -- Uncapitalize if mw.ustring.find(text, '^['.. lcVChars .. ']') then -- It begins with a vowel if not findWord(text, words.vcWords) -- Exclude 'euro' etc. or findWord(text, words.vvWords) -- But not 'Euler' etc. then article = article.an end elseif args.variety and mw.ustring.lower(args.variety)

'us' -- 'herb' etc. and findWord(text, words.cvWordsUS) or findWord(text, words.cvWords) -- 'hour' etc. then article = article.an end end ret = article .. ' ' .. original_text end return retend

function p.main(frame) return p._main(frame:getParent.args)end

return p