# Module:Pagetype

---
-- --
-- This meta-module which automatically detects namespaces, and allows --
-- for a great deal of customisation. It can easily be ported to other --
-- wikis by changing the values in the Module:Pagetype/config. --
-- --
---
-- Load config.
local cfg = mw.loadData('Module:Pagetype/config')  
-- Load required modules.
local yesno = require('Module:Yesno')
local p = {}  
-- Look up a namespace argument in the args table.
local function lookUpNamespaceArg(args, key)
local arg = args[key]
-- Convert "yes", "1" etc. to true, "no", "0" etc. to false, and leave
-- other values the same.
return yesno(arg, arg)
end  
-- Append multiple values to an array
local function appendMultiple(target, source)
for _, value in ipairs(source) do
table.insert(target, value)
end
end  
-- Get argument keys for a title's namespace
local function getNamespaceArgKeys(title)
local nsInfo = mw.site.namespaces[title.namespace]
local customAliases = cfg.customNamespaceAliases[title.namespace] or {}
local keys = {}
if nsInfo.name ~= '' then
table.insert(keys, nsInfo.name)
end
if nsInfo.canonicalName ~= nsInfo.name and nsInfo.canonicalName ~= '' then
table.insert(keys, nsInfo.canonicalName)
end
appendMultiple(keys, nsInfo.aliases)
appendMultiple(keys, customAliases)
return keys
end  
-- Get the argument for a title's namespace, if it was specified in the args table.
local function getNamespaceArg(title, args)
if title.isTalkPage then
return lookUpNamespaceArg(args, cfg.talk)
end
for _, key in ipairs(getNamespaceArgKeys(title)) do
local arg = lookUpNamespaceArg(args, mw.ustring.lower(key))
if arg ~= nil then
return arg
end
end
return nil
end  
-- Look up a page type specific to the title's namespace
local function getExplicitPageType(title)
if title.isTalkPage then
return cfg.talkDefault
else
return cfg.pagetypes[title.namespace]
end
end  
-- Get a default page type that is not specific to the title's namespace
local function getDefaultPageType(args)
local other = lookUpNamespaceArg(args, cfg.other)
if type(other) == 'string' then
return other
else
return cfg.otherDefault
end
end  
local function detectRedirects(title, args)
local redirect = lookUpNamespaceArg(args, cfg.redirect)
if redirect == false then
-- Don't detect redirects if they have been specifically disallowed.
return nil
end  
-- Allow custom values for redirects.
if not title.isRedirect then
return nil
elseif type(redirect) == 'string' then
return redirect
else
return cfg.redirectDefault
end
end  
local function capitalize(pageType)
local first = mw.ustring.sub(pageType, 1, 1)
local rest = mw.ustring.sub(pageType, 2)
return mw.ustring.upper(first) .. rest
end  
local function pluralize(pageType)
if cfg.irregularPlurals[pageType] then
return cfg.irregularPlurals[pageType]
else
return pageType .. cfg.plural -- often 's'
end
end  
local function parseContent(title, args, optionsList)
if title.namespace==828 and title.subpageText~='doc' -- don't detect modules
or not title.exists -- can't check unless page exists
then
return nil
end
local content = title:getContent
if content == nil then
return nil
end
local templates -- lazily evaluated
for _, options in next, optionsList do
local list, parameter, default, articleOnly = unpack(options, 1, 4)
if not articleOnly or title.namespace==0 then -- only check for templates if we should...
local out = lookUpNamespaceArg(args, parameter)
if type(out) == "string" or (out ~= false and default) then -- ...and if we actually have anything to say about them
if not templates then
templates = {} -- do our delayed evaluation now that we are required to
content = require('Module:Wikitext Parsing').PrepareText(content) -- disregard templates which do not have any affect
for template in string.gmatch(content, "
-- Find pages which do not exist
local function nonExistent(title, args)
local arg = lookUpNamespaceArg(args, cfg.ne)
if arg == false then
return nil
end
local exists = false
if title.exists then -- not an article if it does not exist
exists = true
elseif title.namespace==8 and mw.message.new(title.text):exists then
exists = true
elseif title.namespace==6 and title.fileExists then
exists = true
end
if not exists then
if type(arg) == 'string' then
return arg
else
return cfg.naDefault
end
end
end  
-- Get page types for mainspaces pages with an explicit class specified
local function getMainNamespaceClassPageType(title, args)
local class = args[1]
if type(class) == 'string' then -- Put in lower case so e.g. "na" and "NA" will both match
class = mw.ustring.lower(class)
end
local arg = lookUpNamespaceArg(args, cfg.na)
if arg == false then -- don't check for this class if it is specifically disallowed
return nil
end
if cfg.naAliases[class] then
if type(arg) == 'string' then
return arg
else
return cfg.naDefault
end
else
return nil
end
end  
-- Get page type specified by an explicit namespace argument.
local function getNamespaceArgPageType(title, args)
local namespaceArg = getNamespaceArg(title, args)
if namespaceArg == true then
-- Namespace has been explicitly enabled, so return the default for
-- this namespace
return getExplicitPageType(title)
elseif namespaceArg == false then
-- Namespace has been explicitly disabled
return getDefaultPageType(args)
elseif namespaceArg then
-- This namespaces uses custom text
return namespaceArg
else
return nil
end
end  
-- Get page type not specified or detected by other means
local function getOtherPageType(title, args)
-- Whether the title is in the set of default active namespaces which are looked up in cfg.pagetypes.
local isInDefaultActiveNamespace = false
local defaultNamespacesKey = args[cfg.defaultns]
if defaultNamespacesKey == cfg.defaultnsAll then
isInDefaultActiveNamespace = true
else
local defaultNamespaces
if defaultNamespacesKey == cfg.defaultnsExtended then
defaultNamespaces = cfg.extendedNamespaces
elseif defaultNamespacesKey == cfg.defaultnsNone then
defaultNamespaces = {}
else
defaultNamespaces = cfg.defaultNamespaces
end
isInDefaultActiveNamespace = defaultNamespaces[title.namespace]
end
if isInDefaultActiveNamespace then
return getExplicitPageType(title)
else
return getDefaultPageType(args)
end
end  
function p._main(args)
local title
if args.page then
title = mw.title.new(args.page)
else
title = mw.title.getCurrentTitle
end
if title and not yesno(args.talk, true) and args[cfg.defaultns] ~= cfg.defaultnsAll then
title = title.subjectPageTitle
end
local pageType = detectRedirects(title, args)
or nonExistent(title, args)
or parseContent(title, args, {
{'softredirect', cfg.softRedirect, cfg.softRedirectDefault},
{'setindex', cfg.sia, cfg.siaDefault, true},
{'disambiguation', cfg.dab, cfg.dabDefault, true},
{'rfd', cfg.rfd, cfg.rfdDefault},
})
or (title.namespace == 0 and getMainNamespaceClassPageType(title, args))
or getNamespaceArgPageType(title, args)
or getOtherPageType(title, args)
if yesno(args.plural, false) then
pageType = pluralize(pageType)
end
if yesno(args.caps, false) then
pageType = capitalize(pageType)
end
return pageType
end  
function p.main
local args = require('Module:Arguments').getArgs
return p._main(args)
end  
return p