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