Module:Arguments: Difference between revisions

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-- This module provides easy processing of arguments passed to Scribunto from #invoke.
-- This module provides easy processing of arguments passed to Scribunto from
-- It is intended for use by other Lua modules, and should not be called from #invoke directly.
-- #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 = {}


function arguments.getArgs(frame, options)
-- Generate four different tidyVal functions, so that we don't have to check the
options = type(options) == 'table' and options or {}
-- options every time we call it.
 
local function tidyValDefault(key, val)
if type(val) == 'string' then
val = val:match('^%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 val:match('^%s*(.-)%s*$')
else
return val
end
end


-- Get the arguments from the frame object if available. If the frame object is not available, we are being called
local function tidyValRemoveBlanksOnly(key, val)
-- from another Lua module or from the debug console, so put the args in a special table so we can differentiate them.
if type(val) == 'string' then
local fargs, pargs, luaArgs
if val:find('%S') then
if frame == mw.getCurrentFrame() then
return val
fargs = frame.args
else
pargs = frame:getParent().args
return nil
end
else
else
luaArgs = type(frame) == 'table' and frame or {}
return val
end
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 }


-- Set up the args and metaArgs tables. args will be the one accessed from functions, and metaArgs will hold the actual arguments.
function arguments.getArgs(frame, options)
-- The metatable connects the two together.
checkType('getArgs', 1, frame, 'table', true)
local args, metaArgs, metatable = {}, {}, {}
checkType('getArgs', 2, options, 'table', true)
setmetatable(args, metatable)
frame = frame or {}
options = options or {}


local function tidyVal(key, val)
--[[
-- Processes a value according to the options given to getArguments. Can trim whitespace and remove blanks.
-- Set up argument translation.
-- Keys are not used here, but they can be used by user-generated functions, so defining it here to avoid breakage.
--]]
if type(val) == 'string' then
options.translate = options.translate or {}
if options.trim ~= false then
if getmetatable(options.translate) == nil then
val = mw.text.trim(val)
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
})
return val
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 = 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
return val
-- 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
end
else
luaArgs = frame
end
end


-- Use a user-generated function to tidy the values if specified.
-- Set the order of precedence of the argument tables. If the variables are
local valueFunc = options.valueFunc
-- nil, nothing will be added to the table, which is how we avoid clashes
if valueFunc then
-- between the frame/parent args and the Lua args.
local valueFuncType = type(valueFunc)
local argTables = {fargs}
if valueFuncType == 'function' then
argTables[#argTables + 1] = pargs
tidyVal = valueFunc
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
else
error('type error in option "valueFunc": expected function, got ' .. valueFuncType, 2)
tidyVal = tidyValNoChange
end
end
end
end


local function mergeArgs(iterator, tables)
--[[
-- Accepts multiple tables as input and merges their keys and values into one table using the specified iterator.
-- Set up the args, metaArgs and nilArgs tables. args will be the one
-- If a value is already present it is not overwritten; tables listed earlier have precendence.
-- 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 _, t in ipairs(tables) do
for key, val in iterator(t) do
for key, val in pairs(t) do
if metaArgs[key] == nil then
if metaArgs[key] == nil and nilArgs[key] ~= 'h' then
metaArgs[key] = tidyVal(key, val)
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 stored in the metaArgs table, and are only fetched from the
-- Define metatable behaviour. Arguments are memoized in the metaArgs table,
-- argument tables once. Also, we keep a record in the metatable of when pairs and ipairs have been called,
-- and are only fetched from the argument tables once. Fetching arguments
-- so we do not run pairs and ipairs on fargs and pargs more than once. We also do not run ipairs on fargs
-- from the argument tables is the most resource-intensive step in this
-- and pargs if pairs has already been run, as all the arguments will already have been copied over.
-- 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)
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
else
elseif metatable.donePairs or nilArgs[key] then
for i, argTable in ipairs(argTables) do
return nil
local argTableVal = tidyVal(key, argTable[key])
end
if argTableVal ~= nil then
for _, argTable in ipairs(argTables) do
metaArgs[key] = argTableVal
local argTableVal = tidyVal(key, argTable[key])
return argTableVal
if argTableVal ~= nil then
end
metaArgs[key] = argTableVal
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)
if not options.readOnly and (not options.noOverwrite or args[key] == nil) then
-- 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 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(pairs, argTables)
mergeArgs(argTables)
metatable.donePairs = true
metatable.donePairs = true
metatable.doneIpairs = true
end
end
return pairs(metaArgs)
return translatenext, { t = metaArgs }
end
end


metatable.__ipairs = function ()
local function inext(t, i)
if not metatable.doneIpairs then
-- This uses our __index metamethod
mergeArgs(ipairs, argTables)
local v = t[i + 1]
metatable.doneIpairs = true
if v ~= nil then
return i + 1, v
end
end
return ipairs(metaArgs)
end
 
metatable.__ipairs = function (t)
-- Called when ipairs is run on the args table.
return inext, t, 0
end
end


Retrieved from "https://meta.skywiki.org/wiki/Module:Arguments"