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Wikipedia>Mr. Stradivarius: comment the validateArg function

2014-04-06T15:43:28Z

comment the validateArg function

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--[=[
-- This module implements {{user}}. {{user}} is a high-use template, sometimes
-- with thousands of transclusions on a page. This module optimises the
-- template's performance by reducing the number of parameters called from
-- wikitext, while still allowing all the features provided by
-- [[Module:UserLinks]]. It is about twice as fast as the version of {{user}}
-- that called the {{user-multi}} template from wikitext.
--]=]

local mUserLinks = require('Module:UserLinks')
local mShared = require('Module:UserLinks/shared')
local yesno = require('Module:Yesno')

local p = {}

local function validateArg(arg)
-- Validates one argument. Whitespace is stripped, and blank arguments
-- are treated as nil.
if not arg then
return nil
end
arg = arg:match('^%s*(.-)%s*$')
if arg ~= '' then
return arg
else
return nil
end
end

function p.main(frame)
-- Grab the user, project and lang args from wikitext.
local argKeys = {
user = {
1,
'User',
'user'
},
project = {
2,
'Project',
'project'
},
lang = {
3,
'Lang',
'lang'
}
}
local origArgs = frame:getParent().args
local args = {}
for argKey, t in pairs(argKeys) do
for i, origArgKey in ipairs(t) do
local value = origArgs[origArgKey]
value = validateArg(value)
if value then
args[argKey] = value
-- If we have found a value, break the loop. For the average
-- invocation this saves two argument lookups.
break
end
end
end

-- Generate options. Some of these need wikitext args also.
local options = {
span = false,
separator = validateArg(origArgs.separator) or 'dot',
isDemo = yesno(validateArg(origArgs.demo))
}

-- Input the codes directly. This saves two argument lookups for each
-- invocation.
local codes = {'t', 'c'}

-- Plug the data into [[Module:UserLinks]].
local snippets = mUserLinks.getSnippets(args)
local links = mUserLinks.getLinks(snippets)
local success, result = pcall(mUserLinks.export, codes, links, options)
if success then
return result
else
return mShared.makeWikitextError(result, options.isDemo)
end
end

return p

Module:User - Revision history

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Wikipedia>Mr. Stradivarius: comment the validateArg function