Module:Arguments: Difference between revisions
From Mariopedia, a wiki on Mario, Yoshi, Wario, Donkey Kong, Super Smash Bros., and more!
Jump to navigationJump to search
Content deleted Content added
m Protected Module:Arguments: High-risk Lua module ([Edit=Allow only autoconfirmed users] (indefinite) [Move=Allow only autoconfirmed users] (indefinite)) |
m 37 revisions imported from meta:Module:Arguments |
||
(54 intermediate revisions by 35 users not shown) | |||
Line 1: | Line 1: | ||
-- This module provides easy processing of arguments passed to Scribunto from |
-- This module provides easy processing of arguments passed to Scribunto from |
||
-- It is intended for use by other Lua modules, and should not be |
-- #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 = {} |
local arguments = {} |
||
-- Generate four different tidyVal functions, so that we don't have to check the |
|||
function arguments.getArgs(frame, options) |
|||
-- options every time we call it. |
|||
local function tidyValDefault(key, val) |
|||
-- Get the arguments from the frame object if available. If the frame object is not available, we are being called |
|||
if type(val) == 'string' then |
|||
-- from another Lua module or from the debug console, so put the args in a special table so we can differentiate them. |
|||
val = val:match('^%s*(.-)%s*$') |
|||
local fargs, pargs, luaArgs |
|||
if val == '' then |
|||
return nil |
|||
fargs = frame.args |
|||
else |
|||
pargs = frame:getParent().args |
|||
return val |
|||
end |
|||
else |
else |
||
return val |
|||
luaArgs = type(frame) == 'table' and frame or {} |
|||
end |
end |
||
end |
|||
local function tidyValTrimOnly(key, val) |
|||
-- Set up the args and metaArgs tables. args will be the one accessed from functions, and metaArgs will hold the actual arguments. |
|||
if type(val) == 'string' then |
|||
-- The metatable connects the two together. |
|||
return val:match('^%s*(.-)%s*$') |
|||
local args, metaArgs, metatable = {}, {}, {} |
|||
else |
|||
setmetatable(args, metatable) |
|||
return val |
|||
end |
|||
end |
|||
local function tidyValRemoveBlanksOnly(key, val) |
|||
if type(val) == 'string' then |
|||
-- Processes a value according to the options given to getArguments. Can trim whitespace and remove blanks. |
|||
if val:find('%S') then |
|||
-- Keys are not used here, but they can be used by user-generated functions, so defining it here to avoid breakage. |
|||
return val |
|||
if type(val) == 'string' then |
|||
else |
|||
if options.trim ~= false then |
|||
return nil |
|||
val = mw.text.trim(val) |
|||
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 translate_mt = { __index = function(t, k) return k end } |
|||
function arguments.getArgs(frame, options) |
|||
checkType('getArgs', 1, frame, 'table', true) |
|||
checkType('getArgs', 2, options, 'table', true) |
|||
frame = frame or {} |
|||
options = options or {} |
|||
--[[ |
|||
-- Set up argument translation. |
|||
--]] |
|||
options.translate = options.translate or {} |
|||
if getmetatable(options.translate) == nil then |
|||
setmetatable(options.translate, translate_mt) |
|||
end |
|||
if options.backtranslate == nil then |
|||
options.backtranslate = {} |
|||
for k,v in pairs(options.translate) do |
|||
options.backtranslate[v] = k |
|||
end |
|||
end |
|||
if options.backtranslate and getmetatable(options.backtranslate) == nil then |
|||
setmetatable(options.backtranslate, { |
|||
__index = function(t, k) |
|||
if options.translate[k] ~= k then |
|||
return nil |
|||
else |
|||
return k |
|||
end |
|||
end |
end |
||
}) |
|||
if options.removeBlanks == false or mw.ustring.find(val, '%S') then |
|||
end |
|||
return val |
|||
--[[ |
|||
-- 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 = parent:getTitle():gsub('/sandbox$', '') |
|||
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 |
end |
||
else |
else |
||
-- options.wrapper isn't set, so check the other options. |
|||
return val |
|||
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 |
end |
||
if options.parentFirst then |
|||
fargs, pargs = pargs, fargs |
|||
end |
|||
else |
|||
luaArgs = frame |
|||
end |
end |
||
-- Set the order of precedence of the argument tables. If the variables are |
|||
-- Use a user-generated function to tidy the values if specified. |
|||
-- nil, nothing will be added to the table, which is how we avoid clashes |
|||
local valueFunc = options.valueFunc |
|||
-- between the frame/parent args and the Lua args. |
|||
if valueFunc then |
|||
local argTables = {fargs} |
|||
argTables[#argTables + 1] = pargs |
|||
if valueFuncType == 'function' then |
|||
argTables[#argTables + 1] = luaArgs |
|||
tidyVal = valueFunc |
|||
--[[ |
|||
-- 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 |
else |
||
tidyVal = tidyValNoChange |
|||
error('type error in option "valueFunc": expected function, got ' .. valueFuncType, 2) |
|||
end |
end |
||
end |
end |
||
--[[ |
|||
local function mergeArgs(iterator, tables) |
|||
-- Set up the args, metaArgs and nilArgs tables. args will be the one |
|||
-- Accepts multiple tables as input and merges their keys and values into one table using the specified iterator. |
|||
-- accessed from functions, and metaArgs will hold the actual arguments. Nil |
|||
-- If a value is already present it is not overwritten; tables listed earlier have precendence. |
|||
-- 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 _, t in ipairs(tables) do |
||
for key, val in |
for key, val in pairs(t) do |
||
if metaArgs[key] == nil then |
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 |
|||
end |
|||
end |
end |
||
end |
end |
||
end |
end |
||
end |
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 = {} |
|||
if options.frameOnly then |
|||
table.insert(argTables, fargs) |
|||
elseif options.parentOnly then |
|||
table.insert(argTables, pargs) |
|||
elseif options.parentFirst then |
|||
table.insert(argTables, pargs) |
|||
table.insert(argTables, fargs) |
|||
else |
|||
table.insert(argTables, fargs) |
|||
table.insert(argTables, pargs) |
|||
end |
|||
table.insert(argTables, luaArgs) |
|||
--[[ |
--[[ |
||
-- Define metatable behaviour. Arguments are |
-- Define metatable behaviour. Arguments are memoized in the metaArgs table, |
||
-- and are only fetched from the argument tables once. Fetching arguments |
|||
-- argument tables once. Also, we keep a record in the metatable of when pairs and ipairs have been called, |
|||
-- from the argument tables is the most resource-intensive step in this |
|||
-- so we do not run pairs and ipairs on fargs and pargs more than once. We also do not run ipairs on fargs |
|||
-- module, so we try and avoid it where possible. For this reason, nil |
|||
-- and pargs if pairs has already been run, as all the arguments will already have been copied over. |
|||
-- 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) |
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. |
|||
--]] |
|||
if type(key) == 'string' then |
|||
key = options.translate[key] |
|||
end |
|||
local val = metaArgs[key] |
local val = metaArgs[key] |
||
if val ~= nil then |
if val ~= nil then |
||
return val |
return val |
||
elseif metatable.donePairs or nilArgs[key] then |
|||
else |
|||
return nil |
|||
for i, argTable in ipairs(argTables) do |
|||
end |
|||
local argTableVal = tidyVal(key, argTable[key]) |
|||
for _, argTable in ipairs(argTables) do |
|||
if argTableVal ~= nil then |
|||
local argTableVal = tidyVal(key, argTable[key]) |
|||
metaArgs[key] = argTableVal |
|||
if argTableVal ~= nil then |
|||
metaArgs[key] = argTableVal |
|||
end |
|||
return argTableVal |
|||
end |
end |
||
end |
end |
||
nilArgs[key] = 'h' |
|||
return nil |
|||
end |
end |
||
metatable.__newindex = function (t, key, val) |
metatable.__newindex = function (t, key, val) |
||
-- This function is called when a module tries to add a new value to the |
|||
if not options.readOnly and (not options.noOverwrite or args[key] == nil) then |
|||
-- args table, or tries to change an existing value. |
|||
if type(key) == 'string' then |
|||
key = options.translate[key] |
|||
end |
|||
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 |
metaArgs[key] = val |
||
end |
|||
end |
|||
local function translatenext(invariant) |
|||
local k, v = next(invariant.t, invariant.k) |
|||
invariant.k = k |
|||
if k == nil then |
|||
return nil |
|||
elseif type(k) ~= 'string' or not options.backtranslate then |
|||
return k, v |
|||
else |
|||
local backtranslate = options.backtranslate[k] |
|||
if backtranslate == nil then |
|||
-- Skip this one. This is a tail call, so this won't cause stack overflow |
|||
return translatenext(invariant) |
|||
else |
|||
return backtranslate, v |
|||
end |
|||
end |
end |
||
end |
end |
||
metatable.__pairs = function () |
metatable.__pairs = function () |
||
-- Called when pairs is run on the args table. |
|||
if not metatable.donePairs then |
if not metatable.donePairs then |
||
mergeArgs( |
mergeArgs(argTables) |
||
metatable.donePairs = true |
metatable.donePairs = true |
||
metatable.doneIpairs = true |
|||
end |
end |
||
return |
return translatenext, { t = metaArgs } |
||
end |
end |
||
local function inext(t, i) |
|||
-- This uses our __index metamethod |
|||
if not metatable.doneIpairs then |
|||
local v = t[i + 1] |
|||
mergeArgs(ipairs, argTables) |
|||
if v ~= nil then |
|||
metatable.doneIpairs = true |
|||
return i + 1, v |
|||
end |
end |
||
end |
|||
return ipairs(metaArgs) |
|||
metatable.__ipairs = function (t) |
|||
-- Called when ipairs is run on the args table. |
|||
return inext, t, 0 |
|||
end |
end |
||