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Документация для Модуль:Yesno Перейти к коду ↴ [ править | очистить ]

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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.

Синтаксис[]

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.

Использование[]

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('Модуль: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.

Тесты[]

ДаД All tests passed.

Name Expected Actual
ДаД testBlankStringDefaultSet
ДаД testBlankStringNoDefault
ДаД testFalse
ДаД testFalseDefaultPrecedence
ДаД testFalseText
ДаД testFalseTextCaps
ДаД testFalseTextDefaultPrecedence
ДаД testFunctionDefaultSet
ДаД testFunctionNoDefault
ДаД testN
ДаД testNCaps
ДаД testNDefaultPrecedence
ДаД testNil
ДаД testNilDefaultPrecedence
ДаД testNo
ДаД testNoCaps
ДаД testNoDefaultPrecedence
ДаД testNumberDefaultSet
ДаД testNumberNoDefault
ДаД testOne
ДаД testOneDefaultPrecedence
ДаД testOneText
ДаД testOneTextConversion
ДаД testOneTextDefaultPrecedence
ДаД testStringDefaultSet
ДаД testStringNoDefault
ДаД testTableDefaultSet
ДаД testTableNoDefault
ДаД testTrue
ДаД testTrueDefaultPrecedence
ДаД testTrueText
ДаД testTrueTextCaps
ДаД testTrueTextDefaultPrecedence
ДаД testY
ДаД testYCaps
ДаД testYDefaultPrecedence
ДаД testYes
ДаД testYesCaps
ДаД testYesDefaultPrecedence
ДаД testZero
ДаД testZeroDefaultPrecedence
ДаД testZeroText
ДаД testZeroTextConversion
ДаД 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 mw.ustring.lower(val) or val
	if val == nil then
		return nil
	elseif val == true 
		or val == 'yes'
		or val == 'да'
		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 == 'нет'
		or val == 'n'
		or val == 'false'
		or val == 'f'
		or val == 'off'
		or tonumber(val) == 0
	then
		return false
	else
		return default
	end
end
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