 | This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing. |
 | This Lua module is used in MediaWiki:Wantedpages-summary, and on approximately 576,000 pages, or roughly 1% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the module's /sandboxor/testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them. |
 | This module depends on the following other modules:
|
Invoking the labelledList() function is enough to implement most such templates:
{{#invoke:Labelled list hatnote|labelledList|Universal label}}
or
{{#invoke:Labelled list hatnote|labelledList|Singular label|Plural label}}
For example, providing "See also" instead of "Universal label" duplicates the functionality of {{see also}}, while providing "Main article" and "Main articles" instead of "Singular label" and "Plural label" duplicates the (article namespace) functionality of {{main}}.
If third and fourth labels are provided, they'll be used in the case where any of the target pages are outside the article namespace, so e.g. {{main}} can be implemented thus:
{{#invoke:Labelled list hatnote|labelledList|Main article|Main articles|Main page|Main pages}}
The preprocessDisplays() function takes a raw list of arguments and combines in any display arguments. For example, {{see also|1|l1=One}} initially has the arguments table {'1', ['l1'] = 'One'}; this table would combine those into the table {'1|One'}. It overrides manual piping (e.g. {{see also|1{{!}}2|l1=One}} → {'1|One'}) and compresses sparse arrays if a parameter is skipped or left empty.
local mLabelledList = require('Module:Labelled list hatnote')
local pages = mLabelledList.preprocessDisplays(args)
For modules that need to modify the functionality slightly while still using it, _labelledList() provides some flexibility. It takes three parameters:
preprocessDisplaystemplate string with the full title of the template. Defaults to the title of this module.category string (or nil) as taken by makeWikitextError from Module:Hatnote, to optionally disable error categoriesselfref string (or nil) as taken by _hatnote to enable the selfref optionlocal mLabelledList = require('Module:Labelled list hatnote')
return mLabelledList._labelledList(pages, labels, options)
This module causes templates based on it to produce an error message if no page names are provided as template parameters. Normally, these should lead back to "Errors" sections in the documentation of those templates. However, if those templates use a module with _labelledList() and don't provide a template item in their options table, that error defaults to leading back here. The error can be solved by providing at least one valid page-name parameter to the template in question; the problem in the template can be fixed by providing some value to the template item of the _labelledList() options table.
--------------------------------------------------------------------------------
-- Labelled list --
-- --
-- This module does the core work of creating a hatnote composed of a list --
-- prefixed by a colon-terminated label, i.e. "LABEL: [andList of pages]", --
-- for {{see also}} and similar templates. --
--------------------------------------------------------------------------------
local mHatnote = require('Module:Hatnote')
local mHatlist = require('Module:Hatnote list')
local mArguments --initialize lazily
local yesno --initialize lazily
local p = {}
-- Defaults global to this module
local defaults = {
label = 'See also', --Final fallback for label argument
labelForm = '%s: %s',
prefixes = {'label', 'label ', 'l'},
template = 'Module:Labelled list hatnote'
}
-- Localizable message strings
local msg = {
errorSuffix = '#Errors',
noInputWarning = 'no page names specified',
noOutputWarning =
"'''[[%s]] — no output: none of the target pages exist.'''"
}
-- Helper function that pre-combines display parameters into page arguments.
-- Also compresses sparse arrays, as a desirable side-effect.
function p.preprocessDisplays (args, prefixes)
-- Prefixes specify which parameters, in order, to check for display options
-- They each have numbers auto-appended, e.g. 'label1', 'label 1', & 'l1'
prefixes = prefixes or defaults.prefixes
local indices = {}
local sparsePages = {}
for k, v in pairs(args) do
if type(k) == 'number' then
indices[#indices + 1] = k
local display
for i = 1, #prefixes do
display = args[prefixes[i] .. k]
if display then break end
end
sparsePages[k] = display and
string.format('%s|%s', string.gsub(v, '|.*$', ''), display) or v
end
end
table.sort(indices)
local pages = {}
for k, v in ipairs(indices) do pages[#pages + 1] = sparsePages[v] end
return pages
end
--Helper function to get a page target from a processed page string
--e.g. "Page|Label" → "Page" or "Target" → "Target"
local function getTarget(pagename)
local pipe = string.find(pagename, '|')
return string.sub(pagename, 0, pipe and pipe - 1 or nil)
end
-- Produces a labelled pages-list hatnote.
-- The main frame (template definition) takes 1 or 2 arguments, for a singular
-- and (optionally) plural label respectively:
-- * {{#invoke:Labelled list hatnote|labelledList|Singular label|Plural label}}
-- The resulting template takes pagename & label parameters normally.
function p.labelledList (frame)
mArguments = require('Module:Arguments')
yesno = require('Module:Yesno')
local labels = {frame.args[1] or defaults.label}
labels[2] = frame.args[2] or labels[1]
labels[3] = frame.args[3] --no defaulting
labels[4] = frame.args[4] --no defaulting
local template = frame:getParent():getTitle()
local args = mArguments.getArgs(frame, {parentOnly = true})
local pages = p.preprocessDisplays(args)
local options = {
category = yesno(args.category),
extraclasses = frame.args.extraclasses,
ifexists = yesno(frame.args.ifexists),
namespace = frame.args.namespace or args.namespace,
selfref = yesno(frame.args.selfref or args.selfref),
template = template
}
return p._labelledList(pages, labels, options)
end
function p._labelledList (pages, labels, options)
if options.ifexists then
for k = #pages, 1, -1 do --iterate backwards to allow smooth removals
local v = pages[k]
local title = mw.title.new(getTarget(v), namespace)
if (v == '') or title == nil or not title.exists then
table.remove(pages, k)
end
end
end
labels = labels or {}
label = (#pages == 1 and labels[1] or labels[2]) or defaults.label
for k, v in pairs(pages) do
if mHatnote.findNamespaceId(v) ~= 0 then
label =
(
#pages == 1 and
(labels[3] or labels[1] or defaults.label) or
(labels[4] or labels[2] or defaults.label)
) or defaults.label
end
end
if #pages == 0 then
if options.ifexists then
mw.addWarning(
string.format(
msg.noOutputWarning, options.template or defaults.template
)
)
return ''
else
return mHatnote.makeWikitextError(
msg.noInputWarning,
(options.template or defaults.template) .. msg.errorSuffix,
options.category
)
end
end
local text = string.format(
options.labelForm or defaults.labelForm,
label,
mHatlist.andList(pages, true)
)
local hnOptions = {
extraclasses = options.extraclasses,
selfref = options.selfref
}
return mHatnote._hatnote(text, hnOptions)
end
return p
