Module:Category handler

-- --                                                                                                     -- --                                          CATEGORY HANDLER                                            -- --                                                                                                     -- --      This module implements the  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 = 'Ê'

-- 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 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. 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 = 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 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

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