Module:Arguments: Difference between revisions
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local function tidyValNoChange(key, val) | local function tidyValNoChange(key, val) | ||
return 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 | end | ||
Line 55: | Line 60: | ||
--[[ | --[[ | ||
-- Get the arguments | -- 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 | local fargs, pargs, luaArgs | ||
if type(frame.args) == 'table' and type(frame.getParent) == 'function' then | if type(frame.args) == 'table' and type(frame.getParent) == 'function' then | ||
if not options.parentOnly then | if options.wrappers then | ||
fargs = frame.args | --[[ | ||
-- 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 | |||
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 | end | ||
if options.parentFirst then | if options.parentFirst then | ||
Line 122: | Line 170: | ||
setmetatable(args, metatable) | setmetatable(args, metatable) | ||
local function mergeArgs( | local function mergeArgs(tables) | ||
--[[ | --[[ | ||
-- Accepts multiple tables as input and merges their keys and values | -- Accepts multiple tables as input and merges their keys and values | ||
-- into one table | -- 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) | local tidiedVal = tidyVal(key, val) | ||
if tidiedVal == nil then | if tidiedVal == nil then | ||
nilArgs[key] = | nilArgs[key] = 's' | ||
else | else | ||
metaArgs[key] = tidiedVal | metaArgs[key] = tidiedVal | ||
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for _, argTable in ipairs(argTables) do | for _, argTable in ipairs(argTables) do | ||
local argTableVal = tidyVal(key, argTable[key]) | local argTableVal = tidyVal(key, argTable[key]) | ||
if argTableVal | if argTableVal ~= nil then | ||
metaArgs[key] = argTableVal | metaArgs[key] = argTableVal | ||
return argTableVal | return argTableVal | ||
end | end | ||
end | end | ||
nilArgs[key] = 'h' | |||
return nil | return nil | ||
end | end | ||
Line 212: | Line 258: | ||
--]] | --]] | ||
metaArgs[key] = nil | metaArgs[key] = nil | ||
nilArgs[key] = | nilArgs[key] = 'h' | ||
else | else | ||
metaArgs[key] = val | metaArgs[key] = val | ||
Line 221: | Line 267: | ||
-- Called when pairs is run on the args table. | -- 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 | ||
end | end | ||
return pairs(metaArgs) | return pairs(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 | end | ||
metatable.__ipairs = function () | metatable.__ipairs = function (t) | ||
-- Called when ipairs is run on the args table. | -- Called when ipairs is run on the args table. | ||
return inext, t, 0 | |||
end | end | ||
Revision as of 15:39, 2 February 2015
-- 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 = 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*$') else return val end end
local function tidyValRemoveBlanksOnly(key, val) if type(val) == 'string' then if val:find('%S') then return val else return nil end else return val end end
local function tidyValNoChange(key, val) return val end
local function matchesTitle(given, title) local tp = type( given ) return (tp == 'string' or tp == 'number') and mw.title.new( given ).prefixedText == title end
function arguments.getArgs(frame, options) checkType('getArgs', 1, frame, 'table', true) checkType('getArgs', 2, options, 'table', true) frame = frame or {} options = options or {}
--[[ -- Get the argument tables. If we were passed a valid frame object, get the -- frame arguments (fargs) and the parent frame arguments (pargs), depending -- on the options set and on the parent frame's availability. If we weren't -- passed a valid frame object, we are being called from another Lua module -- or from the debug console, so assume that we were passed a table of args -- directly, and assign it to a new variable (luaArgs). --]] local fargs, pargs, luaArgs if type(frame.args) == 'table' and type(frame.getParent) == 'function' then if options.wrappers then --[[ -- The wrappers option makes Module:Arguments look up arguments in -- either the frame argument table or the parent argument table, but -- not both. This means that users can use either the #invoke syntax -- or a wrapper template without the loss of performance associated -- with looking arguments up in both the frame and the parent frame. -- Module:Arguments will look up arguments in the parent frame -- if it finds the parent frame's title in options.wrapper; -- otherwise it will look up arguments in the frame object passed -- to getArgs. --]] local parent = frame:getParent() if not parent then fargs = frame.args else local title = parent:getTitle():gsub('/sandbox$', ) 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 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 key, val in pairs(t) do 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
--[[ -- 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 for _, argTable in ipairs(argTables) do local argTableVal = tidyVal(key, argTable[key]) if argTableVal ~= nil then metaArgs[key] = argTableVal return argTableVal 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
metatable.__pairs = function () -- Called when pairs is run on the args table. if not metatable.donePairs then mergeArgs(argTables) metatable.donePairs = true end return pairs(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