Advertisement
请到维基百科中的模块:Yesno查看此模板的完整文档。

This module 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.

Syntax

yesno(value, default)

value is the value to be tested. Boolean input or boolean-style input (see below) always evaluates to either true or false, and nil always evaluates to nil. Other values evaluate to default.

Usage

First, load the module. Note that it can only be loaded from other Lua modules, not from normal wiki pages. For normal wiki pages you can use {{yesno}} instead.

local yesno = require('Module:Yesno')

Some input values always return true, and some always return false. nil values always return nil.

-- These always return true:
yesno('yes')
yesno('y')
yesno('true')
yesno('t')
yesno('1')
yesno(1)
yesno(true)

-- These always return false:
yesno('no')
yesno('n')
yesno('false')
yesno('f')
yesno('0')
yesno(0)
yesno(false)

-- A nil value always returns nil:
yesno(nil)

String values are converted to lower case before they are matched:

-- These always return true:
yesno('Yes')
yesno('YES')
yesno('yEs')
yesno('Y')
yesno('tRuE')

-- These always return false:
yesno('No')
yesno('NO')
yesno('nO')
yesno('N')
yesno('fALsE')

You can specify a default value if yesno receives input other than that listed above. If you don't supply a default, the module will return nil for these inputs.

-- These return nil:
yesno('foo')
yesno({})
yesno(5)
yesno(function() return 'This is a function.' end)

-- These return true:
yesno('foo', true)
yesno({}, true)
yesno(5, true)
yesno(function() return 'This is a function.' end, true)

-- These return "bar":
yesno('foo', 'bar')
yesno({}, 'bar')
yesno(5, 'bar')
yesno(function() return 'This is a function.' end, 'bar')

Note that the blank string also functions this way:

yesno('')        -- Returns nil.
yesno('', true)  -- Returns true.
yesno('', 'bar') -- Returns "bar".

Although the blank string usually evaluates to false in wikitext, it evaluates to true in Lua. This module prefers the Lua behaviour over the wikitext behaviour. If treating the blank string as false is important for your module, you will need to remove blank arguments at an earlier stage of processing.

Tests

Yes check.svg Y All tests passed.

Name Expected Actual
Yes check.svg Y testBlankStringDefaultSet
Yes check.svg Y testBlankStringNoDefault
Yes check.svg Y testFalse
Yes check.svg Y testFalseDefaultPrecedence
Yes check.svg Y testFalseText
Yes check.svg Y testFalseTextCaps
Yes check.svg Y testFalseTextDefaultPrecedence
Yes check.svg Y testFunctionDefaultSet
Yes check.svg Y testFunctionNoDefault
Yes check.svg Y testN
Yes check.svg Y testNCaps
Yes check.svg Y testNDefaultPrecedence
Yes check.svg Y testNil
Yes check.svg Y testNilDefaultPrecedence
Yes check.svg Y testNo
Yes check.svg Y testNoCaps
Yes check.svg Y testNoDefaultPrecedence
Yes check.svg Y testNumberDefaultSet
Yes check.svg Y testNumberNoDefault
Yes check.svg Y testOne
Yes check.svg Y testOneDefaultPrecedence
Yes check.svg Y testOneText
Yes check.svg Y testOneTextConversion
Yes check.svg Y testOneTextDefaultPrecedence
Yes check.svg Y testStringDefaultSet
Yes check.svg Y testStringNoDefault
Yes check.svg Y testTableDefaultSet
Yes check.svg Y testTableNoDefault
Yes check.svg Y testTrue
Yes check.svg Y testTrueDefaultPrecedence
Yes check.svg Y testTrueText
Yes check.svg Y testTrueTextCaps
Yes check.svg Y testTrueTextDefaultPrecedence
Yes check.svg Y testY
Yes check.svg Y testYCaps
Yes check.svg Y testYDefaultPrecedence
Yes check.svg Y testYes
Yes check.svg Y testYesCaps
Yes check.svg Y testYesDefaultPrecedence
Yes check.svg Y testZero
Yes check.svg Y testZeroDefaultPrecedence
Yes check.svg Y testZeroText
Yes check.svg Y testZeroTextConversion
Yes check.svg Y testZeroTextDefaultPrecedence



-- 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

你现在尚未登录,许多功能可能无法正常使用,若已有账号,请登录,若没有,请先注册Twitch账号
目前我们有非常多的待翻译条目,你也可以看一下目前我们需要优先处理的有哪些目前我们有非常多的待翻译条目,你也可以看一下目前我们需要优先处理的有哪些英雄页面的攻略、克制和物品页面的推荐英雄、小贴士等均为社区玩家编写的,你也可以把自己的心得写上去哦。英雄页面的攻略、克制和物品页面的推荐英雄、小贴士等均为社区玩家编写的,你也可以把自己的心得写上去哦。看不懂技能的buff/debuff是哪个跟哪个?鼠标移动到名称上就能看到游戏内显示的名字和描述了。看不懂技能的buff/debuff是哪个跟哪个?鼠标移动到名称上就能看到游戏内显示的名字和描述了。目前我們沒有善於製作其他中文變體的人員,如果您善於或擁有相關技術,請幫忙補充其他中文變體的空白。目前我們沒有善於製作其他中文變體的人員,如果您善於或擁有相關技術,請幫忙補充其他中文變體的空白。

了解更多