Module:Exists

Module documentation

Main

This Lua module is used on 16,404 pages, or on about 20.04% of all pages.

Edits to this Lua module will be widely noticed. To avoid large-scale disruption and unnecessary server load, any changes to this module should first be tested in its sandbox or testcases subpages. The tested changes can then be added to this page in one single edit by an admin or content moderator.

Please consider discussing any changes in the Discord server.

This module implements {{Exists}}.

-- Module copied from the Genshin Impact wiki
-- Revision as of 5-1-2023
local p = {}

function p.main(frame)
    local args = require('Module:Arguments').getArgs(frame, {
        parentFirst = true,
        wrapper = {'Template:Exists'}
    })
    return p._main(args)
end

function p._main(args)
	local page = args[1] or ''
	local trueResult = args[2] or args['then'] or ''
	local falseResult = args[3] or args['else'] or ''
	
	if (p.checkExists(page)) then
		return trueResult
	else
		return falseResult
	end
end

function p.checkExists(page)
	page = mw.text.decode(page or '')
	local frame = mw.getCurrentFrame()
	if (page:match('[#<>%[%]%{%}]+') or page == '') then
		return false
	elseif (frame:callParserFunction('PROTECTIONEXPIRY:edit', page) ~= '') then
		return true
	else
		return false
	end
end

return p