پودمان:Ns has subpages

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    -- This module implements [[Template:Ns has subpages]].
    -- While the template is fairly simple, this information is made available to
    -- Lua directly, so using a module means that we don't have to update the
    -- template as new namespaces are added.
    
    local p = {}
    
    function p._main(ns, frame)
    	-- Get the current namespace if we were not passed one.
    	if not ns then
    		ns = mw.title.getCurrentTitle().namespace
    	end
    
    	-- Look up the namespace table from mw.site.namespaces. This should work
    	-- for a majority of cases.
    	local nsTable = mw.site.namespaces[ns]
    
    	-- Try using string matching to get the namespace from page names.
    	-- Do a quick and dirty bad title check to try and make sure we do the same
    	-- thing as {{NAMESPACE}} in most cases.
    	if not nsTable and type(ns) == 'string' and not ns:find('[<>|%[%]{}]') then
    		local nsStripped = ns:gsub('^[_%s]*:', '')
    		nsStripped = nsStripped:gsub(':.*$', '')
    		nsTable = mw.site.namespaces[nsStripped]
    	end
    
    	-- If we still have no match then try the {{NAMESPACE}} parser function,
    	-- which should catch the remainder of cases. Don't use a mw.title object,
    	-- as this would increment the expensive function count for each new page
    	-- tested.
    	if not nsTable then
    		frame = frame or mw.getCurrentFrame()
    		local nsProcessed = frame:callParserFunction('NAMESPACE', ns)
    		nsTable = nsProcessed and mw.site.namespaces[nsProcessed]
    	end
    	
    	return nsTable and nsTable.hasSubpages
    end
    
    function p.main(frame)
    	local ns = frame:getParent().args[1]
    	if ns then
    		ns = ns:match('^%s*(.-)%s*$') -- trim whitespace
    		ns = tonumber(ns) or ns
    	end
    	local hasSubpages = p._main(ns, frame)
    	return hasSubpages and 'yes' or ''
    end
    
    return p