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| -- This module provides easy processing of arguments passed to Scribunto from | | -- This module provides easy processing of arguments passed to Scribunto from #invoke. |
| -- #invoke. It is intended for use by other Lua modules, and should not be | | -- It is intended for use by other Lua modules, and should not be called from #invoke directly. |
| -- 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.
| | options = type(options) == 'table' and options or {} |
|
| |
|
| 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 assume arguments are passed directly in. |
| val = val:match('^%s*(.-)%s*$') | | local fargs, pargs |
| if val == '' then | | if frame == mw.getCurrentFrame() then |
| return nil
| | fargs = frame.args |
| else
| | pargs = frame:getParent().args |
| return val
| |
| end
| |
| else | | else |
| return val | | fargs = type(frame) == 'table' and frame or {} |
| | pargs = {} |
| end | | end |
| end
| |
|
| |
|
| local function tidyValTrimOnly(key, val)
| | local args, metaArgs, metatable = {}, {}, {} |
| if type(val) == 'string' then
| | setmetatable(args, metatable) |
| return val:match('^%s*(.-)%s*$')
| |
| else
| |
| return val
| |
| end
| |
| end
| |
| | |
| local function tidyValRemoveBlanksOnly(key, val)
| |
| if type(val) == 'string' then
| |
| if val:find('%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 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 {}
| |
|
| |
|
| --[[ | | local function tidyVal(key, val) |
| -- Set up argument translation.
| | -- Processes a value according to the options given to getArguments. Can trim whitespace and remove blanks. |
| --]]
| | -- Keys are not used here, but they can be used by user-generated functions, so defining it here to avoid breakage. |
| options.translate = options.translate or {}
| | if type(val) == 'string' then |
| if getmetatable(options.translate) == nil then
| | if options.trim ~= false then |
| setmetatable(options.translate, translate_mt) | | val = mw.text.trim(val) |
| 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 functions 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}
| | local valueFuncType = type(valueFunc) |
| 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 | | else |
| tidyVal = tidyValTrimOnly | | error('type error in option "valueFunc": expected function, got ' .. valueFuncType, 2) |
| end
| |
| else
| |
| if options.removeBlanks ~= false then
| |
| tidyVal = tidyValRemoveBlanksOnly
| |
| else
| |
| tidyVal = tidyValNoChange
| |
| end | | end |
| end | | end |
|
| |
|
| --[[ | | local function mergeArgs(iterator, ...) |
| -- 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
| | local tables = {...} |
| -- 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 pairs(t) do | | for key, val in iterator(t) do |
| if metaArgs[key] == nil and nilArgs[key] ~= 'h' then | | if metaArgs[key] == nil then |
| local tidiedVal = tidyVal(key, val)
| | metaArgs[key] = tidyVal(key, val) |
| if tidiedVal == nil then
| |
| nilArgs[key] = 's'
| |
| else
| |
| metaArgs[key] = tidiedVal
| |
| end
| |
| end | | end |
| end | | end |
| end | | end |
| | end |
| | |
| | -- Set the order of precedence of frame args and parent args. |
| | local firstArgs, secondArgs = fargs, pargs |
| | if options.parentFirst then |
| | firstArgs, secondArgs = pargs, fargs |
| end | | end |
|
| |
|
| --[[ | | --[[ |
| -- Define metatable behaviour. Arguments are memoized in the metaArgs table, | | -- Define metatable behaviour. Arguments are stored in the metaArgs table, and are only fetched from the |
| -- and are only fetched from the argument tables once. Fetching arguments
| | -- fargs and pargs tables once. Also, we keep a record in the metatable of when pairs and ipairs have |
| -- from the argument tables is the most resource-intensive step in this | | -- been called, so we do not run pairs and ipairs on fargs and pargs more than once. We also do not run |
| -- module, so we try and avoid it where possible. For this reason, nil
| | -- ipairs on fargs and pargs if pairs has already been run, as all the arguments will already have been |
| -- arguments are also memoized, in the nilArgs table. Also, we keep a record
| | -- copied over. |
| -- 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
| | local firstVal = tidyVal(key, firstArgs[key]) |
| end
| | if firstVal ~= nil then |
| for _, argTable in ipairs(argTables) do
| | return firstVal |
| local argTableVal = tidyVal(key, argTable[key]) | | else |
| if argTableVal ~= nil then | | return tidyVal(key, secondArgs[key]) |
| 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) |
| -- 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(argTables) | | mergeArgs(pairs, firstArgs, secondArgs) |
| metatable.donePairs = true | | metatable.donePairs = true |
| | metatable.doneIpairs = true |
| end | | end |
| return translatenext, { t = metaArgs } | | return pairs(metaArgs) |
| end | | end |
|
| |
|
| local function inext(t, i) | | metatable.__ipairs = function () |
| -- This uses our __index metamethod
| | if not metatable.doneIpairs then |
| local v = t[i + 1]
| | mergeArgs(ipairs, firstArgs, secondArgs) |
| if v ~= nil then | | metatable.doneIpairs = true |
| return i + 1, v | |
| end | | end |
| | return ipairs(metaArgs) |
| end | | end |
| | | |
| metatable.__ipairs = function (t) | |
| -- Called when ipairs is run on the args table.
| |
| return inext, t, 0
| |
| end
| |
| | |
| return args | | return args |
| end | | end |
|
| |
|
| return arguments | | return arguments |