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This documentation is transcluded from 模块:Yesno/doc. Changes can be proposed in the talk page.

This template is imported from 模块:Yesno on Wikipedia.

This template is imported from the English Wikipedia. Although the visual appearance might be different, the functionality is identical. Please refer to the 模块:Yesno page on Wikipedia for detailed documentation.

Module:Yesno provides a consistent interface for processing boolean or boolean-style string input. While Lua allows the true and false boolean values, wikicode templates can only express boolean values through strings such as "yes", "no", etc. This module processes these kinds of strings and turns them into boolean input for Lua to process. It also returns nil values as nil, to allow for distinctions between nil and false. The module also accepts other Lua structures as input, i.e. booleans, numbers, tables, and functions. If it is passed input that it does not recognise as boolean or nil, it is possible to specify a default value to return.

---

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

return function (val, default)
	-- 如果你的维基使用非ASCII字符来表示 "是"、"否 "等等
	-- 你应该在下面一行用 "mw.ustring.lower(val) "替换 "val:lower()"。
	val = type(val) == 'string' and mw.ustring.lower(val) or val
	if val == nil then
		return nil
	elseif val == true 
		or val == '是'
		or val == 'yes'
		or val == 'y'
		or val == 'true'
		or val == 't'
		or tonumber(val) == 1
	then
		return true
	elseif val == false
		or val == '否'
		or val == 'no'
		or val == 'n'
		or val == 'false'
		or val == 'f'
		or tonumber(val) == 0
	then
		return false
	else
		return default
	end
end