Module:Category handler
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Documentation for this module may be created at Module:Category handler/doc
----------------------------------------------------------------------
-- --
-- CATEGORY HANDLER --
-- --
-- This module implements the {{category handler}} 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. This module --
-- requires [[Module:Namespace detect]] to be available on --
-- the local wiki. It can be configured for different wikis --
-- by altering the values in the "cfg" table. --
-- --
----------------------------------------------------------------------
----------------------------------------------------------------------
-- Configuration data --
-- Language-specific parameter names and values can be set --
-- here. --
----------------------------------------------------------------------
local cfg = {}
-- cfg.nocat is the parameter name to suppress categorisation.
-- cfg.nocatTrue is the value to suppress categorisation, and
-- cfg.nocatFalse is the value to both categorise and to skip the
-- blacklist check.
cfg.nocat = 'nocat'
cfg.nocatTrue = 'true'
cfg.nocatFalse = 'false'
-- The parameter name for the legacy "categories" parameter.
cfg.categories = 'categories'
cfg.categoriesYes = 'yes'
-- The parameter name for the legacy "category2" parameter. This
-- skips the blacklist if set to the cfg.category2Yes value, and
-- suppresses categorisation if present but equal to anything other
-- than cfg.category2Yes.
cfg.category2 = 'category2'
cfg.category2Yes = 'yes'
-- cfg.subpage is the parameter name to specify how to behave on
-- subpages. cfg.subpageNo is the value to specify to not
-- categorise on subpages; cfg.only is the value to specify to only
-- categorise on subpages.
cfg.subpage = 'subpage'
cfg.subpageNo = 'no'
cfg.subpageOnly = 'only'
-- The parameter for data to return in all namespaces.
cfg.all = 'all'
-- The parameter name for data to return if no data is specified for
-- the namespace that is detected. This must be the same as the
-- cfg.other parameter in [[Module:Namespace detect]].
cfg.other = 'other'
-- The parameter name used to specify a page other than the current
-- page; used for testing and demonstration. This must be the same
-- as the cfg.page parameter in [[Module:Namespace detect]].
cfg.page = 'page'
-- The categorisation blacklist. Pages that match Lua patterns in this
-- list will not be categorised unless any of the following options are
-- set: "nocat=false", "categories=yes", or "category2=yes".
-- If the namespace name has a space in, it must be written with an
-- underscore, e.g. "Wikipedia_talk". Other parts of the title can have
-- either underscores or spaces.
cfg.blacklist = {
'^Main Page$', -- don't categorise the main page.
-- Don't categorise the following pages or their subpages.
'^Wikipedia:Cascade%-protected items$',
'^Wikipedia:Cascade%-protected items/.*$',
'^User:UBX$', -- The userbox "template" space.
'^User:UBX/.*$',
'^User_talk:UBX$',
'^User_talk:UBX/.*$',
-- Don't categorise subpages of these pages, but allow
-- categorisation of the base page.
'^Wikipedia:Template messages/.*$',
'/[aA]rchive' -- Don't categorise archives.
}
-- This is a table of namespaces to categorise by default. They
-- should be in the format of parameter names accepted by
-- [[Module:Namespace detect]].
cfg.defaultNamespaces = {
'main',
'file',
'help',
'category'
}
----------------------------------------------------------------------
-- End configuration data --
----------------------------------------------------------------------
-- Get dependent modules and declare the table of functions that we will
-- return.
local NamespaceDetect = require('Module:Namespace detect')
local p = {}
----------------------------------------------------------------------
-- Local functions --
-- The following are internal functions, which we do not want --
-- to be accessible from other modules. --
----------------------------------------------------------------------
-- Find whether we need to return a category or not.
local function needsCategory( pageObject, args )
-- If there is no pageObject available, then that either means that we are over
-- the expensive function limit or that the title specified was invalid. Invalid
-- titles will probably only be a problem during testing, so choose the best
-- default for being over the expensive function limit, i.e. categorise the page.
if not pageObject then
return true
end
-- Only categorise if the relevant options are set.
if args[cfg.nocat] == cfg.nocatTrue
or ( args[cfg.category2] and args[cfg.category2] ~= cfg.category2Yes )
or ( args[cfg.subpage] == cfg.subpageNo and pageObject.isSubpage )
or ( args[cfg.subpage] == cfg.subpageOnly and not pageObject.isSubpage ) then
return false
else
return true
end
end
-- Find whether we need to check the blacklist or not.
local function needsBlacklistCheck( args )
if args[cfg.nocat] == cfg.nocatFalse
or args[cfg.categories] == cfg.categoriesYes
or args[cfg.category2] == cfg.category2Yes then
return false
else
return true
end
end
-- Searches the blacklist to find a match with the page object. The
-- string searched is the namespace plus the title, including subpages.
-- Returns true if there is a match, otherwise returns false.
local function findBlacklistMatch( pageObject )
if not pageObject then return end
-- Get the title to check.
local title = pageObject.nsText -- Get the namespace.
-- Append a colon if the namespace isn't the blank string.
if #title > 0 then
title = title .. ':' .. pageObject.text
else
title = pageObject.text
end
-- Check the blacklist.
for i, pattern in ipairs( cfg.blacklist ) do
if mw.ustring.match( title, pattern ) then
return true
end
end
return false
end
-- Find whether any namespace parameters have been specified.
-- Mappings is the table of parameter mappings taken from
-- [[Module:Namespace detect]].
local function nsParamsExist( mappings, args )
if args[cfg.all] or args[cfg.other] then
return true
end
for ns, params in pairs( mappings ) do
for i, param in ipairs( params ) do
if args[param] then
return true
end
end
end
return false
end
-- The main structure of the module. Checks whether we need to categorise,
-- and then passes the relevant arguments to [[Module:Namespace detect]].
local function _main( args )
-- Get the page object and argument mappings from
-- [[Module:Namespace detect]], to save us from having to rewrite the
-- code.
local pageObject = NamespaceDetect.getPageObject( args[cfg.page] )
local mappings = NamespaceDetect.getParamMappings()
-- Check if we need a category or not, and return nothing if not.
if not needsCategory( pageObject, args ) then return end
local ret = '' -- The string to return.
if needsBlacklistCheck( args ) and not findBlacklistMatch( pageObject ) then
if not nsParamsExist( mappings, args ) then
-- No namespace parameters exist; basic usage. Pass args[1] to
-- [[Module:Namespace detect]] using the default namespace
-- parameters, and return the result.
local ndargs = {}
for _, ndarg in ipairs( cfg.defaultNamespaces ) do
ndargs[ndarg] = args[1]
end
ndargs.page = args.page
local ndresult = NamespaceDetect.main( ndargs )
if ndresult then
ret = ret .. ndresult
end
else
-- Namespace parameters exist; advanced usage.
-- If the all parameter is specified, return it.
if args.all then
ret = ret .. args.all
end
-- Get the arguments to pass to [[Module:Namespace detect]].
local ndargs = {}
for ns, params in pairs( mappings ) do
for _, param in ipairs( params ) do
ndargs[param] = args[param] or args[cfg.other] or nil
end
end
if args.other then
ndargs.other = args.other
end
if args.page then
ndargs.page = args.page
end
local data = NamespaceDetect.main( ndargs )
-- Work out what to return based on the result of the namespace
-- detect call.
local datanum = tonumber( data )
if type( datanum ) == 'number' then
-- "data" is a number, so return that positional parameter.
-- Remove non-positive integer values, as only positive integers
-- from 1-10 were used with the old template.
if datanum > 0
and math.floor( datanum ) == datanum
and args[datanum] then
ret = ret .. args[ datanum ]
end
else
-- "data" is not a number, so return it as it is.
if type(data) == 'string' then
ret = ret .. data
end
end
end
end
return ret
end
----------------------------------------------------------------------
-- Global functions --
-- The following functions are global, because we want them --
-- to be accessible from #invoke and from other Lua modules. --
-- At the moment only the main function is here. It processes --
-- the arguments and passes them to the _main function. --
----------------------------------------------------------------------
function p.main( frame )
-- If called via #invoke, use the args passed into the invoking
-- template, or the args passed to #invoke if any exist. Otherwise
-- assume args are being passed directly in.
local origArgs
if frame == mw.getCurrentFrame() then
origArgs = frame:getParent().args
for k, v in pairs( frame.args ) do
origArgs = frame.args
break
end
else
origArgs = frame
end
-- Trim whitespace and remove blank arguments for the following args:
-- 1, 2, 3 etc., "nocat", "categories", "subpage", and "page".
local args = {}
for k, v in pairs( origArgs ) do
v = mw.text.trim(v) -- Trim whitespace.
if type(k) == 'number'
or k == cfg.nocat
or k == cfg.categories
or k == cfg.subpage
or k == cfg.page then
if v ~= '' then
args[k] = v
end
else
args[k] = v
end
end
-- Lower-case "nocat", "categories", "category2", and "subpage". These
-- parameters are put in lower case whenever they appear in the old
-- template, so we can just do it once here and save ourselves some work.
local lowercase = { cfg.nocat, cfg.categories, cfg.category2, cfg.subpage }
for _, v in ipairs( lowercase ) do
if args[v] then
args[v] = mw.ustring.lower( args[v] )
end
end
return _main( args )
end
return p