Module:Sandbox/User:Ans/Wikitext demo

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local p = {}

function p.main(frame)
	-- Need decode(), since mw.text.unstripNoWiki(frame.args[1]) under
	-- {{#invoke:Expand wikitext|preprocessDecodeUnstrip|<nowiki><u>underline</u><ref>text</ref>&lt;/nowiki></nowiki>}}
	-- return "&lt;u&gt;underline&lt;/u&gt;&lt;ref&gt;text&lt;/ref&gt;&lt;/nowiki&gt;"
	--return frame:preprocess(mw.text.decode(mw.text.unstripNoWiki(frame.args[1])))
	-- From experiment in https://test.wikipedia.org/w/index.php?title=Module_talk:User:Ans/performance_test/preprocessDecodeUnstrip&action=edit and https://test.wikipedia.org/w/index.php?title=Module_talk:User:Ans/performance_test/preprocessDecodeUnstrip2&action=edit
	-- this make code run faster
	local text, args = mw.text, frame.args
	local s = text.decode(text.unstripNoWiki(args[1]))
	return frame:newChild{args={
		args[1],
		s,
		frame:preprocess(s),
	}}:preprocess(text.decode(text.unstripNoWiki(
		args[2] or '{{#tag:syntaxhighlight|{{{2}}}|lang=wikitext|inline=}} → {{{3}}}'
	)))
end

return p