Module:Dir

-- This module implements Template:Dir.

-- local rtlOverrides = mw.loadData('Module:Dir/RTL overrides') -- !!! mw.loadData is currently broken, it does NOT load anything local rtlOverrides = require('Module:Dir/RTL overrides') local p = {}

local function trim(s) if s and s ~= '' then s = tostring(s):match('^%s*(.-)%s*$') end if s == '' then return nil end return s end

function p.rtlLangs(isRTL) if isRTL == nil then isRTL = true end return rtlOverrides[isRTL] or {} end

function p.isRTL(code) if type(code) ~= 'string' then return nil end local v = rtlOverrides[code] -- very fast and not limited in the number of supported languages if v ~= nil then return v end -- return it if mapped, otherwise use MediaWiki library: local success, ret = pcall(function        return mw.language.new(code):isRTL -- expensive and limited to 20 languages per MediaWiki instance    end) return success and ret end

function p.select(code, rtl, ltr) if p.isRTL(code) then return rtl else return ltr end end

-- Used via a template -- which just calls, the 3 parameters are automatically trimmed function p.main(frame) local args = frame:getParent.args -- Parameters used to transclude Template:Dir local code = trim(args[1]) local rtl = trim(args[2]) or 'rtl' local ltr = trim(args[3]) or 'ltr' return p.select(code, rtl, ltr) end

setmetatable(p, { quickTests = function    local rtlLangs = p.rtlLangs(true)    local ltrLangs = p.rtlLangs(false)    -- utility: reverse order iterator on sequences    local function revipairs(t)        return function(t, i)            i = i - 1            local v = t[i]            if v == nil then return nil end            return i, v        end, t, #t + 1    end

-- Basic check of data format local function checkLangs(name, langs) for k, lang in pairs(langs) do           assert(type(k) == 'number' and k == math.floor(k)                and type(lang) == 'string' and #lang >= 2 and #lang <= 16                and lang:find('^[a-z][%-0-9a-z]*[0-9a-z]$') == 1,                ": Invalid sequence of language codes, " .. name .. "['" .. k .. "'] = '" .. lang .. "'") end return true end local ok, msg ok, msg = pcall(checkLangs, 'rtlLangs', rtlLangs) if not ok then return false, msg end ok, msg = pcall(checkLangs, 'ltrLangs', ltrLangs) if not ok then return false, msg end

-- Build inverse maps of languages having each direction local isrtl, isltr = {}, {} for _, lang in ipairs(rtlLangs) do isrtl[lang] = true end for _, lang in ipairs(ltrLangs) do isltr[lang] = true end -- Check conflicts using the two inverse maps for _, lang in ipairs(rtlLangs) do       if isltr[lang] then return false, ": Direction conflict for '" .. lang .. "'" end end for _, lang in ipairs(ltrLangs) do       if isrtl[lang] then return false, ": Direction conflict for '" .. lang .. "'" end end

-- Log missing languages (allows filling the tables above) according to MediaWiki internal data local knownLangs = mw.language.fetchLanguageNames for lang, _ in pairs(knownLangs) do        if rtlOverrides[lang] == nil then -- only if we still don't have data for this language -- Note: we cannot check more than 20 languages at once, then MediaWiki raises an error. -- So this test only runs on the Lua console, where you can update the tables at top. ok, value = pcall(function return tostring(mw.language.new(lang):isRTL) end) mw.log("Missing direction for language '" .. lang .. "', MediaWiki returns '" .. value .. "'") end end

-- Sort and deduplicate language code values (by scanning backward) for data cleanup table.sort(rtlLangs) table.sort(ltrLangs) for i, lang in revipairs(rtlLangs) do       if rtlLangs[i - 1] == rtlLangs[i] then table.remove(rtlLangs, i) end end for i, lang in revipairs(ltrLangs) do       if ltrLangs[i - 1] == ltrLangs[i] then table.remove(ltrLangs, i) end end -- Final presentation of current lists, sorted and deduplicated mw.log("local rtlLangs = { '" .. table.concat(rtlLangs, "', '") .. "' }") mw.log("local ltrLangs = { '" .. table.concat(ltrLangs, "', '") .. "' }") return true end }) --[==[ Enter this to run tests in the Lua console: =getmetatable(p).quickTests --]==]

return p