-- 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
 ==
 'да'

		or
 val
 ==
 'д'

        or
 val
 ==
 '+'

		or
 tonumber
(
val
)
 ==
 1

	then

		return
 true

	elseif
 val
 ==
 false

		or
 val
 ==
 'no'

		or
 val
 ==
 'n'

		or
 val
 ==
 'false'

		or
 val
 ==
 'f'

		or
 val
 ==
 'нет'

		or
 val
 ==
 'н'

		or
 val
 ==
 '-'

		or
 tonumber
(
val
)
 ==
 0

	then

		return
 false

	else

		return
 default

	end

end