Module:Category handler
From mintOC
Revision as of 06:08, 22 July 2014 by Mr. Stradivarius (Talk) (allow invocations specifying the page parameter to use the mw.loadData optimisations, and don't call mw.title.new every time)
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]] -- -- and [[Module:Yesno]] to be available on the local wiki. It can be -- -- configured for different wikis by altering the values in -- -- [[Module:Category handler/config]], and pages can be blacklisted -- -- from categorisation by using [[Module:Category handler/blacklist]]. -- -- -- -------------------------------------------------------------------------------- -- Load required modules local yesno = require('Module:Yesno') -- Lazily load things we don't always need local mShared, mappings local p = {} -------------------------------------------------------------------------------- -- Helper functions -------------------------------------------------------------------------------- local function trimWhitespace(s, removeBlanks) if type(s) ~= 'string' then return s end s = s:match('^%s*(.-)%s*$') if removeBlanks then if s ~= '' then return s else return nil end else return s end end -------------------------------------------------------------------------------- -- CategoryHandler class -------------------------------------------------------------------------------- local CategoryHandler = {} CategoryHandler.__index = CategoryHandler function CategoryHandler.new(data, args) local obj = setmetatable({ _data = data, _args = args }, CategoryHandler) -- Set the title object do local pagename = obj:parameter('demopage') local success, titleObj if pagename then success, titleObj = pcall(mw.title.new, pagename) end if success and titleObj then obj.title = titleObj if titleObj == mw.title.getCurrentTitle() then obj._usesCurrentTitle = true end else obj.title = mw.title.getCurrentTitle() obj._usesCurrentTitle = true end end -- Set suppression parameter values for _, key in ipairs{'nocat', 'categories'} do local value = obj:parameter(key) value = trimWhitespace(value, true) obj['_' .. key] = yesno(value) end do local subpage = obj:parameter('subpage') local category2 = obj:parameter('category2') if type(subpage) == 'string' then subpage = mw.ustring.lower(subpage) end if type(category2) == 'string' then subpage = mw.ustring.lower(category2) end obj._subpage = trimWhitespace(subpage, true) obj._category2 = trimWhitespace(category2) -- don't remove blank values end return obj end function CategoryHandler:parameter(key) local parameterNames = self._data.parameters[key] local pntype = type(parameterNames) if pntype == 'string' or pntype == 'number' then return self._args[parameterNames] elseif pntype == 'table' then for _, name in ipairs(parameterNames) do local value = self._args[name] if value ~= nil then return value end end return nil else error(string.format( 'invalid config key "%s"', tostring(key) ), 2) end end function CategoryHandler:isSuppressedByArguments() return -- See if a category suppression argument has been set. self._nocat == true or self._categories == false or ( self._category2 and self._category2 ~= self._data.category2Yes and self._category2 ~= self._data.category2Negative ) -- Check whether we are on a subpage, and see if categories are -- suppressed based on our subpage status. or self._subpage == self._data.subpageNo and self.title.isSubpage or self._subpage == self._data.subpageOnly and not self.title.isSubpage end function CategoryHandler:shouldSkipBlacklistCheck() -- Check whether the category suppression arguments indicate we -- should skip the blacklist check. return self._nocat == false or self._categories == true or self._category2 == self._data.category2Yes end function CategoryHandler:matchesBlacklist() if self._usesCurrentTitle then return self._data.currentTitleMatchesBlacklist else mShared = mShared or require('Module:Category handler/shared') return mShared.matchesBlacklist( self.title.prefixedText, mw.loadData('Module:Category handler/blacklist') ) end end function CategoryHandler:isSuppressed() -- Find if categories are suppressed by either the arguments or by -- matching the blacklist. return self:isSuppressedByArguments() or not self:shouldSkipBlacklistCheck() and self:matchesBlacklist() end function CategoryHandler:getNamespaceParameters() if self._usesCurrentTitle then return self._data.currentTitleNamespaceParameters else if not mappings then mShared = mShared or require('Module:Category handler/shared') mappings = mShared.getParamMappings(true) -- gets mappings with mw.loadData end return mShared.getNamespaceParameters( self.title, mappings ) end end function CategoryHandler:namespaceParametersExist() -- Find whether any namespace parameters have been specified. -- We use the order "all" --> namespace params --> "other" as this is what -- the old template did. if self:parameter('all') then return true end if not mappings then mShared = mShared or require('Module:Category handler/shared') mappings = mShared.getParamMappings(true) -- gets mappings with mw.loadData end for ns, params in pairs(mappings) do for i, param in ipairs(params) do if self._args[param] then return true end end end if self:parameter('other') then return true end return false end function CategoryHandler:getCategories() local params = self:getNamespaceParameters() local nsCategory for i, param in ipairs(params) do local value = self._args[param] if value ~= nil then nsCategory = value break end end if nsCategory ~= nil or self:namespaceParametersExist() then -- Namespace parameters exist - advanced usage. if nsCategory == nil then nsCategory = self:parameter('other') end local ret = {self:parameter('all')} local numParam = tonumber(nsCategory) if numParam and numParam >= 1 and math.floor(numParam) == numParam then -- nsCategory is an integer ret[#ret + 1] = self._args[numParam] else ret[#ret + 1] = nsCategory end if #ret < 1 then return nil else return table.concat(ret) end elseif self._data.defaultNamespaces[self.title.namespace] then -- Namespace parameters don't exist, simple usage. return self._args[1] end return nil end -------------------------------------------------------------------------------- -- Exports -------------------------------------------------------------------------------- local p = {} function p._exportClasses() -- Used for testing purposes. return { CategoryHandler = CategoryHandler } end function p._main(args, data) data = data or mw.loadData('Module:Category handler/data') local handler = CategoryHandler.new(data, args) if handler:isSuppressed() then return nil end return handler:getCategories() end function p.main(frame, data) data = data or mw.loadData('Module:Category handler/data') local args = require('Module:Arguments').getArgs(frame, { wrappers = data.wrappers, valueFunc = function (k, v) v = trimWhitespace(v) if type(k) == 'number' then if v ~= '' then return v else return nil end else return v end end }) return p._main(args, data) end return p