Module:Anchor

This Lua module is used in system messages.
Changes to it can cause immediate changes to the Wikipedia user interface.
To avoid major disruption, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them.

This module is subject to page protection. It is a highly visible module in use by a very large number of pages, and/or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

This module implements {{anchor}}. Please see the Template:Anchor/doc page for documentation.

-- This module implements {{anchor}}.

local getArgs = require('Module:Arguments').getArgs
local tableTools = require('Module:TableTools')

local p = {}

function p.main(frame)
	-- Get the positional arguments from #invoke, remove any nil values,
	-- and pass them to p._main.
	local args = getArgs(frame)
	local argArray = tableTools.compressSparseArray(args)
	return p._main(unpack(argArray))
end

function p._main(...)
	-- Generate the list of anchors.
	local anchors = {...}
	local ret = {}
	for _, anchor in ipairs(anchors) do
		ret[#ret + 1] = '<span class="anchor" id="' .. anchor .. '"></span>'
	end
	return table.concat(ret)
end

return p