Module:Namespace detect

--                                                                                               -- --                                           NAMESPACE DETECT                                     -- --                                                                                               -- --      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. The module can also use the         -- --     corresponding subject namespace value if it is used on a talk page. Parameter names      -- --     can be configured for different wikis by altering the values in the "cfg" table. -- --                                                                                               --

--                                         Configuration data                                    -- --     Language-specific parameter names can be set here. --

local cfg = {}

-- This parameter displays content for the main namespace: cfg.main = 'main'

-- This parameter displays in talk namespaces: cfg.talk = 'talk'

-- This parameter displays content for "other" namespaces (namespaces for which -- parameters have not been specified, or for when cfg.demospace is set to cfg.other): cfg.other = 'other'

-- This parameter makes talk pages behave as though they are the corresponding subject namespace. -- Note that this parameter is used with Module:Yesno. Edit that module to change -- the default values of "yes", "no", etc. cfg.subjectns = 'subjectns'

-- This parameter sets a demonstration namespace: cfg.demospace = 'demospace'

-- This parameter sets a specific page to compare: cfg.page = 'page'

-- The header for the namespace column in the wikitable containing the list of possible subject-space parameters. cfg.wikitableNamespaceHeader = 'Namespace'

-- The header for the wikitable containing the list of possible subject-space parameters. cfg.wikitableAliasesHeader = 'Aliases'

--                                      End configuration data                                   --

local yesno = require('Module:Yesno')

local p = {}

function p.getPageObject(page) -- Get the page object, passing the function through pcall in case we are over the expensive function count limit. if page then local noError, pageObject = pcall(mw.title.new, page) if not noError then return nil else return pageObject end else return mw.title.getCurrentTitle end end

function p.getParamMappings -- Returns a table of how parameter names map to namespace names. The keys are the actual namespace 	 names, in lower case, and the values are the possible parameter names for that namespace, also in	  lower case. The table entries are structured like this:		[''] = {			{'main'},		},		['wikipedia'] = {			{'wikipedia', 'project', 'wp'}		} local mappings = {} mappings[mw.ustring.lower(mw.site.namespaces[0].name)] = {cfg.main} mappings[cfg.talk] = {cfg.talk} for nsid, ns in pairs(mw.site.subjectNamespaces) do if nsid ~= 0 then -- Exclude main namespace. local nsname = mw.ustring.lower(ns.name) local canonicalName = mw.ustring.lower(ns.canonicalName) mappings[nsname] = {nsname} if canonicalName ~= nsname then table.insert(mappings[nsname], canonicalName) end for _, alias in ipairs(ns.aliases) do				table.insert(mappings[nsname], mw.ustring.lower(alias)) end end end return mappings end

local function getNamespace(args) -- Gets the namespace name from the page object. local page = args[cfg.page] local demospace = args[cfg.demospace] local subjectns = args[cfg.subjectns] local ret if demospace then -- Handle "demospace = main" properly. if mw.ustring.lower(demospace) == cfg.main then ret = mw.site.namespaces[0].name else ret = demospace end else local pageObject = p.getPageObject(page) if pageObject then if pageObject.isTalkPage then -- If cfg.subjectns is set, get the subject namespace, otherwise use cfg.talk. if yesno(subjectns) then ret = mw.site.namespaces[pageObject.namespace].subject.name else ret = cfg.talk end else ret = pageObject.nsText end else return nil -- return nil if the page object doesn't exist. end end return mw.ustring.lower(ret) end

function p._main(args) -- Get the namespace to compare the parameters to, and the parameter mapping table. local namespace = getNamespace(args) local mappings = p.getParamMappings -- Check for any matches in the namespace arguments. The order we check them doesn't matter, -- as there can only be one match. for ns, params in pairs(mappings) do		if ns == namespace then -- Check all aliases for matches. The default local namespace is checked first, as -- checked these before alias names. for _, param in ipairs(params) do				if args[param] then return args[param] end end end end -- If there were no matches, return parameters for other namespaces. This happens if there -- was no text specified for the namespace that was detected or if the demospace parameter -- is not a valid namespace. Note that the parameter for the detected namespace must be -- completely absent for this to happen, not merely blank. if args[cfg.other] then return args[cfg.other] end 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 demospace and page parameters. local args = {} for k, v in pairs(origArgs) do		if type(v) == 'string' then v = mw.text.trim(v) -- Trim whitespace. end if k == cfg.demospace or k == cfg.page then if v ~= '' then args[k] = v			end else args[k] = v		end end return p._main(args) end

function p.table(frame) -- Create a wikitable of all subject namespace parameters, for documentation purposes. The talk 	 parameter is optional, in case it needs to be excluded in the documentation. local useTalk = type(frame) == 'table' and type(frame.args) == 'table' and frame.args.talk == 'yes' -- Whether to use the talk parameter. local mappings = p.getParamMappings -- Start the wikitable. local ret = '{| class="wikitable"' .. '\n|-' .. '\n! ' .. cfg.wikitableNamespaceHeader .. '\n! ' .. cfg.wikitableAliasesHeader -- Generate the row for the main namespace, as we want this to be first in the list. ret = ret .. '\n|-' .. '\n| ' .. '\n|' if useTalk then ret = ret .. '\n|-' .. '\n| ' .. '\n|' end -- Enclose all parameter names in ' end end end -- Generate the other wikitable rows. for ns, params in pairs(mappings) do if ns ~= mw.site.namespaces[0].name then -- Ignore the main namespace. ret = ret .. '\n|-' .. '\n| ' .. params[1] .. '\n| ' .. table.concat(params, ', ', 2) end end -- End the wikitable. ret = ret .. '\n|-' .. '\n|}' return ret end

return p