-- 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