وحدة:Arguments with aliases
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-- This module is forked from [[:en:Module:Arguments]] to support aliases -- main idea of aliases is from [[:en:Citaion/CS1]] -- This module provides easy processing of arguments passed to Scribunto from -- #invoke. It is intended for use by other Lua modules, and should not be -- called from #invoke directly. local libraryUtil = require('libraryUtil') local checkType = libraryUtil.checkType local arguments = {} -- Generate four different tidyVal functions, so that we don't have to check the -- options every time we call it. local function tidyValDefault(key, val) if type(val) == 'string' then val = mw.ustring.match(val, '^%s*(.-)%s*$') if val == '' then return nil else return val end else return val end end local function tidyValTrimOnly(key, val) if type(val) == 'string' then return mw.ustring.match(val, '^%s*(.-)%s*$') else return val end end local function tidyValRemoveBlanksOnly(key, val) if type(val) == 'string' then if mw.ustring.find(val, '%S') then return val else return nil end else return val end end local function tidyValNoChange(key, val) return val end local function matchesTitle(given, title) local tp = type( given ) return (tp == 'string' or tp == 'number') and mw.title.new( given ).prefixedText == title end local function tableClone(t) checkType('tableClone', 1, t, 'table') if getmetatable(t) and getmetatable(t).mw_loadData then local ret = {} for k, v in pairs(t) do ret[k] = v end return ret else return t end end function arguments.getArgs(frame, options) checkType('getArgs', 1, frame, 'table', true) checkType('getArgs', 2, options, 'table', true) frame = frame or {} options = options or {} local aliases = options.aliases and tableClone(options.aliases) or {} local numbered_aliases = options.numbered_aliases and tableClone(options.numbered_aliases) or nil local backtranslate = options.backtranslate and tableClone(options.backtranslate) or nil local numbered_backtranslate = options.numbered_backtranslate and tableClone(options.numbered_backtranslate) or nil local origin = {} --[[ -- Set up argument translation. --]] local translate_mt = { __index = function(t, k) local order_num = mw.ustring.match(k,'%d+') if order_num and numbered_aliases then local plist = numbered_aliases[mw.ustring.gsub(k,order_num,"#")] if plist then local ret if type(plist) == 'table' then ret = {} for _,v in ipairs(plist) do local numarg = mw.ustring.gsub(v, '#', order_num ) table.insert(ret, numarg) end else ret= mw.ustring.gsub(plist, '#', order_num ) end return ret end end return k end } if getmetatable(aliases) == nil then setmetatable(aliases, translate_mt) end if backtranslate == nil then backtranslate = {} for k, list in pairs(aliases) do if type(list) == 'table' then for _, v in pairs(list) do backtranslate[v] = k end else backtranslate[list] = k end end end if numbered_aliases and numbered_backtranslate == nil then numbered_backtranslate = {} for k, list in pairs(numbered_aliases) do if type(list) == 'table' then for _, v in pairs(list) do numbered_backtranslate[v] = k end else numbered_backtranslate[list] = k end end end if backtranslate and getmetatable(backtranslate) == nil then setmetatable(backtranslate, { __index = function(t, k) local order_num = mw.ustring.match(k,'%d+') if order_num and numbered_backtranslate then local plist = numbered_backtranslate[mw.ustring.gsub(k,order_num,"#")] if plist then return mw.ustring.gsub(plist, '#', order_num ) end end return k end }) end --[[ -- Get the argument tables. If we were passed a valid frame object, get the -- frame arguments (fargs) and the parent frame arguments (pargs), depending -- on the options set and on the parent frame's availability. If we weren't -- passed a valid frame object, we are being called from another Lua module -- or from the debug console, so assume that we were passed a table of args -- directly, and assign it to a new variable (luaArgs). --]] local fargs, pargs, luaArgs if type(frame.args) == 'table' and type(frame.getParent) == 'function' then if options.wrappers then --[[ -- The wrappers option makes Module:Arguments look up arguments in -- either the frame argument table or the parent argument table, but -- not both. This means that users can use either the #invoke syntax -- or a wrapper template without the loss of performance associated -- with looking arguments up in both the frame and the parent frame. -- Module:Arguments will look up arguments in the parent frame -- if it finds the parent frame's title in options.wrapper; -- otherwise it will look up arguments in the frame object passed -- to getArgs. --]] local parent = frame:getParent() if not parent then fargs = frame.args else local title = mw.ustring.gsub(mw.ustring.gsub(parent:getTitle(), '/sandbox$', ''), '/ملعب$', '') local found = false if matchesTitle(options.wrappers, title) then found = true elseif type(options.wrappers) == 'table' then for _,v in pairs(options.wrappers) do if matchesTitle(v, title) then found = true break end end end -- We test for false specifically here so that nil (the default) acts like true. if found or options.frameOnly == false then pargs = parent.args end if not found or options.parentOnly == false then fargs = frame.args end end else -- options.wrapper isn't set, so check the other options. if not options.parentOnly then fargs = frame.args end if not options.frameOnly then local parent = frame:getParent() pargs = parent and parent.args or nil end end if options.parentFirst then fargs, pargs = pargs, fargs end else luaArgs = frame end -- Set the order of precedence of the argument tables. If the variables are -- nil, nothing will be added to the table, which is how we avoid clashes -- between the frame/parent args and the Lua args. local argTables = {fargs} argTables[#argTables + 1] = pargs argTables[#argTables + 1] = luaArgs --[[ -- Generate the tidyVal function. If it has been specified by the user, we -- use that; if not, we choose one of four functions depending on the -- options chosen. This is so that we don't have to call the options table -- every time the function is called. --]] local tidyVal = options.valueFunc if tidyVal then if type(tidyVal) ~= 'function' then error( "bad value assigned to option 'valueFunc'" .. '(function expected, got ' .. type(tidyVal) .. ')', 2 ) end elseif options.trim ~= false then if options.removeBlanks ~= false then tidyVal = tidyValDefault else tidyVal = tidyValTrimOnly end else if options.removeBlanks ~= false then tidyVal = tidyValRemoveBlanksOnly else tidyVal = tidyValNoChange end end --[[ -- Set up the args, metaArgs and nilArgs tables. args will be the one -- accessed from functions, and metaArgs will hold the actual arguments. Nil -- arguments are memoized in nilArgs, and the metatable connects all of them -- together. --]] local args, metaArgs, nilArgs, metatable = {}, {}, {}, {} setmetatable(args, metatable) local function mergeArgs(tables) --[[ -- Accepts multiple tables as input and merges their keys and values -- into one table. If a value is already present it is not overwritten; -- tables listed earlier have precedence. We are also memoizing nil -- values, which can be overwritten if they are 's' (soft). --]] for _, t in ipairs(tables) do for akey, val in pairs(t) do local key = backtranslate[akey] if metaArgs[key] == nil and nilArgs[key] ~= 'h' then local tidiedVal = tidyVal(key, val) if tidiedVal == nil then nilArgs[key] = 's' else metaArgs[key] = tidiedVal origin[key] = akey end end end end end --[[ -- Define metatable behaviour. Arguments are memoized in the metaArgs table, -- and are only fetched from the argument tables once. Fetching arguments -- from the argument tables is the most resource-intensive step in this -- module, so we try and avoid it where possible. For this reason, nil -- arguments are also memoized, in the nilArgs table. Also, we keep a record -- in the metatable of when pairs and ipairs have been called, so we do not -- run pairs and ipairs on the argument tables more than once. We also do -- not run ipairs on fargs and pargs if pairs has already been run, as all -- the arguments will already have been copied over. --]] metatable.__index = function (t, key) --[[ -- Fetches an argument when the args table is indexed. First we check -- to see if the value is memoized, and if not we try and fetch it from -- the argument tables. When we check memoization, we need to check -- metaArgs before nilArgs, as both can be non-nil at the same time. -- If the argument is not present in metaArgs, we also check whether -- pairs has been run yet. If pairs has already been run, we return nil. -- This is because all the arguments will have already been copied into -- metaArgs by the mergeArgs function, meaning that any other arguments -- must be nil. --]] local val = metaArgs[key] if val ~= nil then return val elseif metatable.donePairs or nilArgs[key] then return nil end local list = (type(key) == "number") and key or aliases[key]; for _,argTable in ipairs(argTables) do if type( list ) == 'table' then for _, alias_key in pairs( list ) do local argTableVal = tidyVal(key, argTable[alias_key]) if argTableVal ~= nil then metaArgs[key] = argTableVal origin[key] = alias_key return argTableVal end end elseif list ~= nil then local argTableVal = tidyVal(key, argTable[list]) if argTableVal ~= nil then metaArgs[key] = argTableVal origin[key] = list return argTableVal end end if argTable[key] then local argTableVal = tidyVal(key, argTable[key]) if argTableVal ~= nil then metaArgs[key] = argTableVal origin[key] = key return argTableVal end end end nilArgs[key] = 'h' return nil end metatable.__newindex = function (t, key, val) -- This function is called when a module tries to add a new value to the -- args table, or tries to change an existing value. if options.readOnly then error( 'could not write to argument table key "' .. tostring(key) .. '"; the table is read-only', 2 ) elseif options.noOverwrite and args[key] ~= nil then error( 'could not write to argument table key "' .. tostring(key) .. '"; overwriting existing arguments is not permitted', 2 ) elseif val == nil then --[[ -- If the argument is to be overwritten with nil, we need to erase -- the value in metaArgs, so that __index, __pairs and __ipairs do -- not use a previous existing value, if present; and we also need -- to memoize the nil in nilArgs, so that the value isn't looked -- up in the argument tables if it is accessed again. --]] metaArgs[key] = nil nilArgs[key] = 'h' else metaArgs[key] = val end end args._ORIGIN = function ( self, k ) -- تعطي الوسيط الأصلي الذي كتبه المستخدم مهمة في رسائل الخطأ local dummy = self[k]; -- force the variable to be loaded. return origin[k]; end local function translatenext(invariant) local k, v = next(invariant.t, invariant.k) invariant.k = k if k == nil then return nil elseif k == '_ORIGIN' then return translatenext(invariant) elseif type(k) ~= 'string' or not backtranslate then return k, v else local k_backtranslate = backtranslate[k] if k_backtranslate == nil then -- Skip this one. This is a tail call, so this won't cause stack overflow return translatenext(invariant) else return k_backtranslate, v end end end metatable.__pairs = function () -- Called when pairs is run on the args table. if not metatable.donePairs then mergeArgs(argTables) metatable.donePairs = true end return translatenext, { t = metaArgs } end local function inext(t, i) -- This uses our __index metamethod local v = t[i + 1] if v ~= nil then return i + 1, v end end metatable.__ipairs = function (t) -- Called when ipairs is run on the args table. return inext, t, 0 end return args end return arguments