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-- Function allowing for consistent treatment of boolean-like wikitext input.
-- It works similarly to the template {{yesno}}.

return function (val, default)
	-- If your wiki uses non-ascii characters for any of "yes", "no", etc., you
	-- should replace "val:lower()" with "mw.ustring.lower(val)" in the
	-- following line.
	val = type(val) == 'string' and val:lower() or val
	if val == nil then
		return nil
	elseif val == true 
		or val == 'yes'
		or val == 'y'
		or val == 'true'
		or val == 't'
		or val == 'on'
		or tonumber(val) == 1
	then
		return true
	elseif val == false
		or val == 'no'
		or val == 'n'
		or val == 'false'
		or val == 'f'
		or val == 'off'
		or tonumber(val) == 0
	then
		return false
	else
		return default
	end
end

Templates used on this page:

Template:Documentation (edit)
Template:High-use (edit)
Template:Tl (view source) (semi-protected)
Module:Arguments (view source) (protected)
Module:Documentation (edit)
Module:Documentation/config (edit)
Module:Documentation/styles.css (edit)
Module:Effective protection expiry (view source) (semi-protected)
Module:Effective protection level (edit)
Module:File link (edit)
Module:High-use (edit)
Module:Message box (view source) (protected)
Module:Message box/configuration (view source) (protected)
Module:Message box/ombox.css (view source) (protected)
Module:Protection banner (edit)
Module:Protection banner/config (view source) (semi-protected)
Module:Transclusion count (edit)
Module:Transclusion count/data/Y (edit)
Module:Yesno (view source) (protected)
Module:Yesno/doc (edit)

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Retrieved from "https://en.wikisource.org/wiki/Module:Yesno"