Difference between revisions of "Module:Arguments"
From Game Detectives Wiki
(create argument-processing module) |
(return a table rather than a function, improve the comments) |
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| Line 1: | Line 1: | ||
-- This module provides easy processing of arguments passed to Scribunto from #invoke. | -- 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 function | + | local arguments = {} |
| + | |||
| + | function arguments.getArgs(frame, options) | ||
options = type(options) == 'table' and options or {} | options = type(options) == 'table' and options or {} | ||
| + | -- Get the arguments from the frame object if available. If the frame object is not available, we are being called | ||
| + | -- from another Lua module or from the debug console, so assume arguments are passed directly in. | ||
local fargs, pargs | local fargs, pargs | ||
if frame == mw.getCurrentFrame() then | if frame == mw.getCurrentFrame() then | ||
| Line 31: | Line 36: | ||
end | end | ||
| + | -- Use a user-generated functions to tidy the values if specified. | ||
local valueFunc = options.valueFunc | local valueFunc = options.valueFunc | ||
if valueFunc then | if valueFunc then | ||
| Line 54: | Line 60: | ||
end | end | ||
| + | -- Set the order of precedence of frame args and parent args. | ||
local firstArgs, secondArgs = fargs, pargs | local firstArgs, secondArgs = fargs, pargs | ||
if options.parentFirst then | if options.parentFirst then | ||
| Line 59: | Line 66: | ||
end | end | ||
| + | -- Define metatable behaviour. | ||
metatable.__index = function (t, key) | metatable.__index = function (t, key) | ||
local val = metaArgs[key] | local val = metaArgs[key] | ||
| Line 99: | Line 107: | ||
end | end | ||
| − | return | + | return arguments |
Revision as of 02:19, 9 December 2013
Documentation for this module may be created at Module:Arguments/doc
-- 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 arguments = {}
function arguments.getArgs(frame, options)
options = type(options) == 'table' and options or {}
-- Get the arguments from the frame object if available. If the frame object is not available, we are being called
-- from another Lua module or from the debug console, so assume arguments are passed directly in.
local fargs, pargs
if frame == mw.getCurrentFrame() then
fargs = frame.args
pargs = frame:getParent().args
else
fargs = type(frame) == 'table' and frame or {}
pargs = {}
end
local args, metaArgs, metatable = {}, {}, {}
setmetatable(args, metatable)
local function tidyVal(key, val)
-- 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.
if type(val) == 'string' then
if options.trim ~= false then
val = mw.text.trim(val)
end
if options.removeBlanks == false or mw.ustring.find(val, '%S') then
return val
end
else
return val
end
end
-- Use a user-generated functions to tidy the values if specified.
local valueFunc = options.valueFunc
if valueFunc then
local valueFuncType = type(valueFunc)
if valueFuncType == 'function' then
tidyVal = valueFunc
else
error('type error in option "valueFunc": expected function, got ' .. valueFuncType, 2)
end
end
local function mergeArgs(iterator, ...)
-- Accepts multiple tables as input and merges their keys and values into one table using the specified iterator.
-- If a value is already present it is not overwritten; tables listed earlier have precendence.
local tables = {...}
for _, t in ipairs(tables) do
for key, val in iterator(t) do
if metaArgs[key] == nil then
metaArgs[key] = tidyVal(key, val)
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
-- Define metatable behaviour.
metatable.__index = function (t, key)
local val = metaArgs[key]
if val ~= nil then
return val
else
local firstVal = tidyVal(key, firstArgs[key])
if firstVal ~= nil then
return firstVal
else
return tidyVal(key, secondArgs[key])
end
end
end
metatable.__newindex = function (t, key, val)
if not options.readOnly and (not options.noOverwrite or metaArgs[key] == nil) then
metaArgs[key] = val
end
end
metatable.__pairs = function ()
if not metatable.donePairs then
mergeArgs(pairs, firstArgs, secondArgs)
metatable.donePairs = true
metatable.doneIpairs = true
end
return pairs(metaArgs)
end
metatable.__ipairs = function ()
if not metatable.doneIpairs then
mergeArgs(ipairs, firstArgs, secondArgs)
metatable.doneIpairs = true
end
return ipairs(metaArgs)
end
return args
end
return arguments
