Category handler
-- -- -- CATEGORY HANDLER -- -- -- -- This module implements the Template: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 and -- -- Module:Yesno 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 = {}
-- The following config values set the names of parameters that suppress categorisation. They are used -- with Module:Yesno, and work as follows: -- -- cfg.nocat: -- Result of yesno(args[cfg.nocat]) Effect -- true Categorisation is suppressed -- false Categorisation is allowed, and the blacklist check is skipped -- nil Categorisation is allowed -- -- cfg.categories: -- Result of yesno(args[cfg.categories]) Effect -- true Categorisation is allowed, and the blacklist check is skipped -- false Categorisation is suppressed -- nil Categorisation is allowed cfg.nocat = 'nocat' cfg.categories = 'categories'
-- 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 or cfg.category2Negative. cfg.category2 = 'category2' cfg.category2Yes = 'yes' cfg.category2Negative = '¬'
-- 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. -- (However, see the explanation of cfg.nocat, cfg.categories and cfg.category2 for some exceptions.) -- 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 local nsDetect = require('Module:Namespace detect') local yesno = require('Module:Yesno')
-- 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)
-- Don't categorise if the relevant options are set.
if yesno(args[cfg.nocat])
or yesno(args[cfg.categories]) == false
or (
args[cfg.category2]
and args[cfg.category2] ~= cfg.category2Yes
and args[cfg.category2] ~= cfg.category2Negative
)
then
return false
end
-- 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 we choose the best
-- fallback for being over the expensive function limit. The fallback behaviour
-- of the old template was to assume the page was not a subpage, so we will do
-- the same here.
if args[cfg.subpage] == cfg.subpageNo and pageObject and pageObject.isSubpage then
return false
end
if args[cfg.subpage] == cfg.subpageOnly
and (not pageObject or (pageObject and not pageObject.isSubpage))
then
return false
end
return true
end
-- Find whether we need to check the blacklist or not. local function needsBlacklistCheck(args)
if yesno(args[cfg.nocat]) == false
or yesno(args[cfg.categories]) == true
or args[cfg.category2] == cfg.category2Yes
then
return false
else
return true
end
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
-- Global functions -- -- The following functions are global, because we want them to be accessible from #invoke and -- -- from other Lua modules. --
local p = {}
-- Find if a string matches the blacklist. Returns the match if one is found, or nil otherwise. -- Input should be a page title with a namespace prefix, e.g. "Wikipedia talk:Articles for deletion". function p.matchesBlacklist(page)
if type(page) ~= 'string' then return end
for i, pattern in ipairs(cfg.blacklist) do
local match = mw.ustring.match(page, pattern)
if match then
return match
end
end
end
-- The main structure of the module. Checks whether we need to categorise, -- and then passes the relevant arguments to Module:Namespace detect. function p._main(args)
-- Get the page object and argument mappings from -- Module:Namespace detect, to save us from having to rewrite the -- code. local pageObject = nsDetect.getPageObject(args[cfg.page]) local mappings = nsDetect.getParamMappings() if not needsCategory(pageObject, args) then return end local ret = -- Check blacklist if necessary. if not needsBlacklistCheck(args) or not p.matchesBlacklist(pageObject.prefixedText) 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 ndargs.demospace = args.demospace local ndresult = nsDetect._main(ndargs) if ndresult then ret = ret .. ndresult end else -- Namespace parameters exist; advanced usage. -- If the all parameter is specified, return it. local all = args.all if type(all) == 'string' then ret = ret .. 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 ndargs.other = args.other ndargs.page = args.page ndargs.demospace = args.demospace local data = nsDetect._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 then local dataArg = args[datanum] if type(dataArg) == 'string' then ret = ret .. dataArg end 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
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
if type(v) == 'string' then
v = mw.text.trim(v) -- Trim whitespace.
end
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
local argVal = args[v]
if type(argVal) == 'string' then
args[v] = mw.ustring.lower(argVal)
end
end
return p._main(args)
end
return p