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<translate><!--T:1--> This module provides a consistent interface for processing boolean or boolean-style string input.</translate>
<translate><!--T:2--> While Lua allows the <tvar name=1><code>true</code></tvar> and <tvar name=2><code>false</code></tvar> boolean values, wikicode templates can only express boolean values through strings such as <tvar name=3>"1"</tvar>, <tvar name=4>"0"</tvar>, <tvar name=5>"yes"</tvar>, <tvar name=6>"no"</tvar>, etc.</translate>
<translate><!--T:3--> This module processes these kinds of strings and turns them into boolean input for Lua to process.</translate>
<translate><!--T:4--> It also returns <tvar name=1><code>nil</code></tvar> values as <tvar name=1><code>nil</code></tvar>, to allow for distinctions between <tvar name=1><code>nil</code></tvar> and <tvar name=2><code>false</code></tvar>.</translate>
<translate><!--T:5--> The module also accepts other Lua structures as input, i.e. booleans, numbers, tables, and functions.</translate>
<translate><!--T:6--> If it is passed input that it does not recognise as boolean or <tvar name=1><code>nil</code></tvar>, it is possible to specify a default value to return.</translate>
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== Module Quality == <!--T:34-->
<!--T:36-->
This module provides a consistent interface for processing boolean or boolean-style string input.
While Lua allows the <code>true</code> and <code>false</code> boolean values, wikicode templates can only express boolean values through strings such as "1", "0", "yes", "no", etc.
This module processes these kinds of strings and turns them into boolean input for Lua to process.
It also returns <code>nil</code> values as <code>nil</code>, to allow for distinctions between <code>nil</code> and <code>false</code>.
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 <code>nil</code>, it is possible to specify a default value to return.

== Module Quality == <!--T:37-->

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== Syntax == <!--T:33-->
== Syntax == <!--T:38-->
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<!--T:39-->
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
yesno(value, default)
yesno(value, default)
</syntaxhighlight>
</syntaxhighlight>


<!--T:40-->
<translate><!--T:7--> <tvar name=1><code>value</code></tvar> is the value to be tested.</translate>
<code>value</code> is the value to be tested.
<translate><!--T:8--> Boolean input or boolean-style input (see below) always evaluates to either <tvar name=1><code>true</code></tvar> or <tvar name=2><code>false</code></tvar>, and <tvar name=3><code>nil</code></tvar> always evaluates to <tvar name=3><code>nil</code></tvar>.</translate>
Boolean input or boolean-style input (see below) always evaluates to either <code>true</code> or <code>false</code>, and <code>nil</code> always evaluates to <code>nil</code>.
<translate><!--T:9--> Other values evaluate to <tvar name=1><code>default</code></tvar>.</translate>
Other values evaluate to <code>default</code>.
<translate>

== Usage == <!--T:10-->
== Usage == <!--T:41-->
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<translate><!--T:11--> First, load the module. Note that it can only be loaded from other Lua modules, not from normal wiki pages.</translate>
<!--T:42-->
<translate><!--T:12--> For normal wiki pages you can use <tvar name=1>{{tlx|yesno}}</tvar> instead.</translate>
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 {{tlx|yesno}} instead.


<!--T:43-->
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
local yesno = require('Module:Yesno')
local yesno = require('Module:Yesno')
</syntaxhighlight>
</syntaxhighlight>


<!--T:44-->
<translate><!--T:13--> Some input values always return <tvar name=1><code>true</code></tvar>, and some always return <tvar name=2><code>false</code></tvar>.</translate>
<translate><!--T:14--> <tvar name=1><code>nil</code></tvar> values always return <tvar name=1><code>nil</code></tvar>.</translate>
Some input values always return <code>true</code>, and some always return <code>false</code>.
<code>nil</code> values always return <code>nil</code>.


<!--T:45-->
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
-- <translate nowrap><!--T:15--> These always return <tvar name=1>true</tvar>:</translate>
-- These always return true:
yesno('yes')
yesno('yes')
yesno('y')
yesno('y')
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yesno(true)
yesno(true)


<!--T:46-->
-- <translate nowrap><!--T:16--> These always return <tvar name=1>false</tvar>:</translate>
-- These always return false:
yesno('no')
yesno('no')
yesno('n')
yesno('n')
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yesno(false)
yesno(false)


<!--T:47-->
-- <translate nowrap><!--T:17--> A <tvar name=1>nil</tvar> value always returns <tvar name=1>nil</tvar>:</translate>
-- A nil value always returns nil:
yesno(nil)
yesno(nil)
</syntaxhighlight>
</syntaxhighlight>
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<!--T:18-->
String values are converted to lower case before they are matched:
String values are converted to lower case before they are matched:
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<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
-- <translate nowrap><!--T:19--> These always return <tvar name=1>true</tvar>:</translate>
-- These always return true:
yesno('Yes')
yesno('Yes')
yesno('YES')
yesno('YES')
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yesno('tRuE')
yesno('tRuE')


<!--T:48-->
-- <translate nowrap><!--T:20--> These always return <tvar name=1>false</tvar>:</translate>
-- These always return false:
yesno('No')
yesno('No')
yesno('NO')
yesno('NO')
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</syntaxhighlight>
</syntaxhighlight>


<!--T:49-->
<translate><!--T:21--> You can specify a default value if <tvar name=1><code>yesno</code></tvar> receives input other than that listed above.</translate>
You can specify a default value if <code>yesno</code> receives input other than that listed above.
<translate><!--T:22--> If you don't supply a default, the module will return <tvar name=1><code>nil</code></tvar> for these inputs.</translate>
If you don't supply a default, the module will return <code>nil</code> for these inputs.


<!--T:50-->
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
-- <translate nowrap><!--T:23--> These return <tvar name=1>nil</tvar>:</translate>
-- These return nil:
yesno('foo')
yesno('foo')
yesno({})
yesno({})
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yesno(function() return 'This is a function.' end)
yesno(function() return 'This is a function.' end)


<!--T:51-->
-- <translate nowrap><!--T:24--> These return <tvar name=1>true</tvar>:</translate>
-- These return true:
yesno('foo', true)
yesno('foo', true)
yesno({}, true)
yesno({}, true)
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yesno(function() return 'This is a function.' end, true)
yesno(function() return 'This is a function.' end, true)


<!--T:52-->
-- <translate nowrap><!--T:25--> These return <tvar name=1>"bar"</tvar>:</translate>
-- These return "bar":
yesno('foo', 'bar')
yesno('foo', 'bar')
yesno({}, 'bar')
yesno({}, 'bar')
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yesno(function() return 'This is a function.' end, 'bar')
yesno(function() return 'This is a function.' end, 'bar')
</syntaxhighlight>
</syntaxhighlight>
<translate>
<!--T:26-->
Note that the blank string also functions this way:
Note that the blank string also functions this way:
</translate>
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
yesno('') -- <translate nowrap><!--T:27--> Returns <tvar name=1>nil</tvar>.</translate>
yesno('') -- Returns nil.
yesno('', true) -- <translate nowrap><!--T:28--> Returns <tvar name=1>true</tvar>.</translate>
yesno('', true) -- Returns true.
yesno('', 'bar') -- <translate nowrap><!--T:29--> Returns <tvar name=1>"bar"</tvar>.</translate>
yesno('', 'bar') -- Returns "bar".
</syntaxhighlight>
</syntaxhighlight>


<!--T:53-->
<translate><!--T:30--> Although the blank string usually evaluates to <tvar name=1><code>false</code></tvar> in wikitext, it evaluates to <tvar name=2><code>true</code></tvar> in Lua.</translate>
Although the blank string usually evaluates to <code>false</code> in wikitext, it evaluates to <code>true</code> in Lua.
<translate><!--T:31--> This module prefers the Lua behaviour over the wikitext behaviour.</translate>
This module prefers the Lua behaviour over the wikitext behaviour.
<translate><!--T:32--> If treating the blank string as <tvar name=1><code>false</code></tvar> is important for your module, you will need to remove blank arguments at an earlier stage of processing.</translate>
If treating the blank string as <code>false</code> is important for your module, you will need to remove blank arguments at an earlier stage of processing.
<includeonly>{{Sandbox other||
<includeonly>{{Sandbox other||
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[[Category:Modules]]
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