Module:Namespace detect

This module allows you to output different text depending on the namespace that a given page is in. It is a Lua implementation of the {{namespace detect}} template, with a few improvements: all namespaces and all namespace aliases are supported, and namespace names are detected automatically for the local wiki.

Usage

{{#invoke: Namespace detect | main
| page              = <!-- page to detect namespace for, if not the current page -->
| main              = <!-- text to return for the main namespace -->
| talk              = <!-- text to return for talk namespaces -->
<!-- text to return for specific subject namespaces -->
| portal            =
| category          =
| user 	            =
| draft             =
| wikipedia         =
| mediawiki         =
| book              =
| timedtext         =
| template          =
| special           =
| media             =
| file              =
| help 	            =
| module            =
| other             = <!-- text to return for unspecified namespaces -->
| demospace         = <!-- namespace to display text for -->
| subjectns         = <!-- set to "yes" to treat talk pages as the corresponding subject page -->
}}

Parameters

• main - text to return if the page is in the main namespace.
• talk - text to return if the page is in a talk namespace. This can be any talk namespace - it will match any of "Talk:", "Wikipedia talk:", "User talk:", etc.
• Subject namespace parameters, e.g. wikipedia, user, file... - the text to return if the page is in the corresponding namespace. This module accepts all subject namespaces as parameters, including namespace aliases and virtual namespaces. See below for a list of supported values.
• other - text to return if no parameters for the page's namespace were specified. This text is also returned if |demospace= is set to an invalid namespace value.
• subjectns - if on a talk page, use the corresponding subject page. Can be set with values of "yes", "y", "true" or "1".
• demopage - specifies a page to detect the namespace of. If not specified, and if the |demospace= parameter is not set, then the module uses the current page.
• demospace - force the module to behave as if the page was in the specified namespace. Often used for demonstrations.

Namespace parameters

Possible values for subject namespace parameters are as follows:

Namespace	Aliases
main
user
the right wiki	project
file	image
mediawiki
template
help
category
portal
item
property
lexeme
timedtext
module

Table function

Use the following to display a table with the different possible namespace parameters: {{#invoke:Namespace detect|table|talk=yes}} To include the parameter for talk namespaces, use |talk=yes.

Porting to different wikis

This module is designed to be portable. To use it on a different wiki, all you need to do is to change the values in Module:Namespace detect/config. Instructions are available on that page.

Technical details

The module uses a data page at Module:Namespace detect/data. This page is loaded with mw.loadData, which means it is processed once per page rather than once per #invoke. This was done for performance reasons.

---

--[[
--------------------------------------------------------------------------------
--                                                                            --
--                            NAMESPACE DETECT                                --
--                                                                            --
-- This module implements the {{namespace detect}} template in Lua, with a    --
-- few improvements: all namespaces and all namespace aliases are supported,  --
-- and namespace names are detected automatically for the local wiki. The     --
-- module can also use the corresponding subject namespace value if it is     --
-- used on a talk page. Parameter names can be configured for different wikis --
-- by altering the values in the "cfg" table in                               --
-- Module:Namespace detect/config.                                            --
--                                                                            --
--------------------------------------------------------------------------------
--]]
local data = mw.loadData('Module:Namespace detect/data')
local argKeys = data.argKeys
local cfg = data.cfg
local mappings = data.mappings
local yesno = require('Module:Yesno')
local mArguments -- Lazily initialise Module:Arguments
local mTableTools -- Lazily initilalise Module:TableTools
local ustringLower = mw.ustring.lower
local p = {}
local function fetchValue(t1, t2)
-- Fetches a value from the table t1 for the first key in array t2 where
-- a non-nil value of t1 exists.
for i, key in ipairs(t2) do
local value = t1[key]
if value ~= nil then
return value
end
end
return nil
end
local function equalsArrayValue(t, value)
-- Returns true if value equals a value in the array t. Otherwise
-- returns false.
for i, arrayValue in ipairs(t) do
if value == arrayValue then
return true
end
end
return false
end
function p.getPageObject(page)
-- Get the page object, passing the function through pcall in case of
-- errors, e.g. being over the expensive function count limit.
if page then
local success, pageObject = pcall(mw.title.new, page)
if success then
return pageObject
else
return nil
end
else
return mw.title.getCurrentTitle()
end
end
-- Provided for backward compatibility with other modules
function p.getParamMappings()
return mappings
end
local function getNamespace(args)
-- This function gets the namespace name from the page object.
local page = fetchValue(args, argKeys.demopage)
if page == '' then
page = nil
end
local demospace = fetchValue(args, argKeys.demospace)
if demospace == '' then
demospace = nil
end
local subjectns = fetchValue(args, argKeys.subjectns)
local ret
if demospace then
-- Handle "demospace = main" properly.
if equalsArrayValue(argKeys.main, ustringLower(demospace)) then
ret = mw.site.namespaces[0].name
else
ret = demospace
end
else
local pageObject = p.getPageObject(page)
if pageObject then
if pageObject.isTalkPage then
-- Get the subject namespace if the option is set,
-- otherwise use "talk".
if yesno(subjectns) then
ret = mw.site.namespaces[pageObject.namespace].subject.name
else
ret = 'talk'
end
else
ret = pageObject.nsText
end
else
return nil -- return nil if the page object doesn't exist.
end
end
ret = ret:gsub('_', ' ')
return ustringLower(ret)
end
function p._main(args)
-- Check the parameters stored in the mappings table for any matches.
local namespace = getNamespace(args) or 'other' -- "other" avoids nil table keys
local params = mappings[namespace] or {}
local ret = fetchValue(args, params)
--[[
-- If there were no matches, return parameters for other namespaces.
-- This happens if there was no text specified for the namespace that
-- was detected or if the demospace parameter is not a valid
-- namespace. Note that the parameter for the detected namespace must be
-- completely absent for this to happen, not merely blank.
--]]
if ret == nil then
ret = fetchValue(args, argKeys.other)
end
return ret
end
function p.main(frame)
mArguments = require('Module:Arguments')
local args = mArguments.getArgs(frame, {removeBlanks = false})
local ret = p._main(args)
return ret or ''
end
function p.table(frame)
--[[
-- Create a wikitable of all subject namespace parameters, for
-- documentation purposes. The talk parameter is optional, in case it
-- needs to be excluded in the documentation.
--]]
-- Load modules and initialise variables.
mTableTools = require('Module:TableTools')
local namespaces = mw.site.namespaces
local cfg = data.cfg
local useTalk = type(frame) == 'table'
and type(frame.args) == 'table'
and yesno(frame.args.talk) -- Whether to use the talk parameter.
-- Get the header names.
local function checkValue(value, default)
if type(value) == 'string' then
return value
else
return default
end
end
local nsHeader = checkValue(cfg.wikitableNamespaceHeader, 'Namespace')
local aliasesHeader = checkValue(cfg.wikitableAliasesHeader, 'Aliases')
-- Put the namespaces in order.
local mappingsOrdered = {}
for nsname, params in pairs(mappings) do
if useTalk or nsname ~= 'talk' then
local nsid = namespaces[nsname].id
-- Add 1, as the array must start with 1; nsid 0 would be lost otherwise.
nsid = nsid + 1
mappingsOrdered[nsid] = params
end
end
mappingsOrdered = mTableTools.compressSparseArray(mappingsOrdered)
-- Build the table.
local ret = '{| class="wikitable"'
.. '\n|-'
.. '\n! ' .. nsHeader
.. '\n! ' .. aliasesHeader
for i, params in ipairs(mappingsOrdered) do
for j, param in ipairs(params) do
if j == 1 then
ret = ret .. '\n|-'
.. '\n| <code>' .. param .. '</code>'
.. '\n| '
elseif j == 2 then
ret = ret .. '<code>' .. param .. '</code>'
else
ret = ret .. ', <code>' .. param .. '</code>'
end
end
end
ret = ret .. '\n|-'
.. '\n|}'
return ret
end
return p