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<!-- Place categories where indicated at the bottom of this page and interwikis at Wikidata (see [[Wikipedia:Wikidata]]) -->
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 "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.
{{#ifeq:{{ROOTPAGENAME}}|Yesno|{{high-use|480+}}}}


== Syntax ==
{{tlx|Yesno}} (or {{tlx|YesNo}}) evaluates any input and produces a normalized <samp>yes</samp> or <samp>no</samp>, based on the content of the input and several configurable options. It is not used in article prose, but in coding complex templates.
 
<source lang="lua">yesno(value, default)</source>
 
<code>value</code> is the value to be tested. 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>. Other values evaluate to <code>default</code>.


== Usage ==
== Usage ==
The template distinguishes five different types of input, supplied on the first unnamed parameter:
# '''Yes''': Case-insensitive forms of <code>Yes</code>, <code>y<code>, <code>true</code>, and <code>1</code>; e.g. {{tlx|Yesno|yEs}}
# '''No''': Case-insensitive forms of <code>No</code>, <code>n</code>, <code>false</code>, and <code>0</code>; e.g. {{tlx|Yesno|nO}}
# '''Nothing''': When the input is defined but either contains no value or consists of [[whitespace character]] only; i.e. <code><nowiki>{{Yesno|}}</nowiki></code> or {{tlx|Yesno|&nbsp;}}
# '''Negation''': When the input is either <code>¬</code> or entirely missing; i.e. {{tlx|Yesno|¬}} or {{tlx|Yesno}}
# '''Anything else''': e.g. {{tlx|Yesno|Purple monkey dish washer}}


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 {{tl|yesno}} instead.
By default, the template returns "yes" in the first and last case but returns blank in the other cases.
 
<source lang="lua">
local yesno = require('Module:Yesno')
</source>
 
Some input values always return <code>true</code>, and some always return <code>false</code>. <code>nil</code> values always return <code>nil</code>.
 
<source lang="lua">
-- 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:
Two short-hand templates for the most common uses that override the default behavior:
yesno(nil)
* {{tlx|yesno-yes}} or {{tlx|YesNo-Yes}} – always returns "yes" (or the specified replacement result in {{para|yes}}) unless an explicit negative value is given; i.e., it evaluates to "yes" even when the value is empty or missing.
</source>
* {{tlx|yesno-no}} or {{tlx|YesNo-No}} – always returns "no" (or the specified replacement result in {{para|no}}) unless an explicit positive value is given; i.e., it evaluates to "no" even when the value is present, as long as it does not contain anything that resolves to "yes".


String values are converted to lower case before they are matched:
===Customizing the output===
Template's default output can be customized with five named parameters, respectively: {{para|yes}}, {{para|no}}, {{para|blank}}, {{para|¬}} and {{para|def}}. If these parameters are specified, the template response is as follows:
# '''Yes''': Template returns the contents of {{para|yes}}, otherwise returns "yes". For example:
#* {{tlx|yesno|y|3=yes=Yeah}} results in "{{yesno|y|yes=Yeah}}"
#* {{tlx|yesno|y|3=yes=bacon}}  results in "{{yesno|y|yes=bacon}}"
# '''No''': Template returns the contents of {{para|no}}, otherwise returns blank. For example:
#* {{tlx|yesno|n|3=no=Nay}} results in "{{yesno|n|no=Nay}}"
#* {{tlx|yesno|n|3=no=ham}} results in "{{yesno|n|no=ham}}"
# '''Nothing''': Template returns the contents of {{para|blank}}, or of {{para|no}} in absence of the former; otherwise, returns blank.
#* {{tlx|yesno||3=blank=eggs}} results in "{{yesno||blank=eggs}}"
#* {{tlx|yesno||3=no=ham}} results in "{{yesno||no=ham}}"
#* {{tlx|yesno||3=blank=eggs|4=no=ham}} results in "{{yesno||blank=eggs|no=ham}}"
# '''Negation''': Template returns the contents of {{para|¬}}, otherwise returns blank. For example:
#* {{tlx|yesno|¬|3=¬=sausage}} results in "{{yesno|¬|¬=sausage}}"
# '''Anything else''': Template returns the contents of {{para|def}}, or of {{para|yes}} in absence of the former; otherwise, returns "yes".
#* {{tlx|yesno|purple monkey dish washer|3=def=cup of tea}} results in "{{yesno|purple monkey dish washer|def=cup of tea}}"
#* {{tlx|yesno|purple monkey dish washer|3=yes=bacon}} results in "{{yesno|purple monkey dish washer|yes=bacon}}"
#* {{tlx|yesno|purple monkey dish washer|3=def=cup of tea|4=yes=bacon}} results in "{{yesno|purple monkey dish washer|def=cup of tea|yes=bacon}}"


<source lang="lua">
For the named parameters, use of a blank value is not the same as omitting the parameter. Blank named parameters tells the template that the customized return value is blank. For example:
-- These always return true:
* {{tlx|yesno|purple monkey dish washer}} results in "{{yesno|purple monkey dish washer}}"
yesno('Yes')
* {{tlx|yesno|purple monkey dish washer|3=def=}} results in "{{yesno|purple monkey dish washer|def=}}" {{var|[blank]}}
yesno('YES')
yesno('yEs')
yesno('Y')
yesno('tRuE')


-- These always return false:
===Logical distinctions===
yesno('No')
yesno('NO')
yesno('nO')
yesno('N')
yesno('fALsE')
</source>


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 <code>nil</code> for these inputs.
{| class=wikitable border=1 cellpadding=2 style="text-align:left; width:100%;"
|-
! colspan=7 style="background:#d0d0d0;" | Overview of {{tlx|yesno}} ''logical values'' and their associated texts
|- style="text-align:left; vertical-align:top; font-weight:bold; background:#e8e8e8;"
| Input<br />parameter 1<br />({{code|1=1=}})
| In code
| Logical return value
| Default<br />return text
|
| Return text when set:<br />{{code|1=yes=Pos}}<br />{{code|1=no=Neg}}<br />{{code|1=blank=Blank}}<br />{{code|1=¬=Undefined}}<br />{{code|1=def=Def}}
| Note
|-
| yes, y, true, 1*
| {{code|1=<nowiki>{{yesno|yes}}</nowiki>}}
| {{nowrap|{{code|yes by definition}}}}
| "{{yesno|yes}}"
|
| "{{yesno|yes|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
| <nowiki>*</nowiki> Case-insensitive (Y=y)
|-
| {{nowrap|Some Text}}
| {{nowrap|{{code|1=<nowiki>{{yesno|Some Text}}</nowiki>}}}}
| {{code|yes by default}}
| "{{yesno|Some Text}}"
|
| "{{yesno|Some Text|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
| "{{yesno|Some Text|yes=Pos|no=Neg|blank=Blank|¬=Undefined}}" when {{nowrap|1=<code>def={{var|[omitted]}}</code>}}
|-
| no, n, false, 0*
| {{code|1=<nowiki>{{yesno|no}}</nowiki>}}
| {{code|no by definition}}
| "{{yesno|no}}" {{var|[blank]}}
|
| "{{yesno|no|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
| <nowiki>*</nowiki> Case-insensitive (N=n)
|-
| {{var|[blank]}}
| {{code|1=<nowiki>{{yesno|}}</nowiki>}}
| {{code|blank}}
| "{{yesno|1=}}" {{var|[blank]}}
|
| "{{yesno||yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
| "{{yesno||yes=Pos|no=Neg|¬=Undefined|def=Def}}" when {{nowrap|1=<code>blank={{var|[omitted]}}</code>}}
|-
| 1={{var|[blank]}}
| {{code|1=<nowiki>{{yesno|1=}}</nowiki>}}
| {{code|blank}}
| "{{yesno|1=}}" {{var|[blank]}}
|
| "{{yesno|1=|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
| "{{yesno|1=|yes=Pos|no=Neg|¬=Undefined|def=Def}}" when {{nowrap|1=<code>blank={{var|[omitted]}}</code>}}
|-
| ¬
| {{code|1=<nowiki>{{yesno|¬}}</nowiki>}}
| {{code|¬}}
| "{{yesno|¬}}" {{var|[blank]}}
|
| "{{yesno|¬|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
|
|-
| {{var|[omitted]}}
| {{code|1=<nowiki>{{yesno}}</nowiki>}}
| {{code|¬}}
| "{{yesno}}" {{var|[blank]}}
|
| "{{yesno|yes=Pos|no=Neg|blank=Blank|¬=Undefined|def=Def}}"
|
|}


<source lang="lua">
== Full parameter list ==
-- These return nil:
Unnamed parameter 1= the input value to be evaluated. The other parameters (all named, all optional), are the ''return values'' for their respective logical outcome. When set, each one overrules their ''default return value''.
yesno('foo')
yesno({})
yesno(5)
yesno(function() return 'This is a function.' end)


-- These return true:
<pre>
yesno('foo', true)
{{yesno
yesno({}, true)
|
yesno(5, true)
| yes  =
yesno(function() return 'This is a function.' end, true)
| no  =
| blank=
| ¬    =
| def  =
}}
</pre>


-- These return "bar":
== See also ==
yesno('foo', 'bar')
* [[Module:yesno]]
yesno({}, 'bar')
yesno(5, 'bar')
yesno(function() return 'This is a function.' end, 'bar')
</source>


Note that the blank string also functions this way:
== TemplateData ==
<source lang="lua">
{{TemplateDataHeader}}
yesno('')       -- Returns nil.
<templatedata>
yesno('', true)  -- Returns true.
{
yesno('', 'bar') -- Returns "bar".
        "description": "This template normalises an input to be a yes/no output.",
</source>
        "params": {
                "1": {
                        "label": "Input value",
                        "description": "The value to be evaluated",
                        "type": "string",
                        "required": true
                },
                "yes": {
                        "label": "Output on yes",
                        "description": "Specifies the output of the template when the input value is a case-insensitive forms of 'Yes', 'Y', 'True' or '1'",
                        "type": "string",
                        "required": false
                },
                "no": {
                        "label": "Output on no",
                        "description": "Specifies the output of the template when the input value is a case-insensitive forms of 'No', 'N', 'False, or '0'",
                        "type": "string",
                        "required": false
                },
                "blank": {
                        "label": "Output on blank input",
                        "description": "Specifies the output of the template when the input value is defined but is either empty or contains nothing but whitespace character(s)",
                        "type": "string",
                        "required": false
                },
                "¬": {
                        "label": "Output on ¬",
                        "description": "Specifies the output of the template when the input value is either '¬' or entirely missing (undefined)",
                        "type": "string",
                        "required": false
                },
                "def": {
                        "label": "Definite output",
                        "description": "Specifies the output of the template when the input value is defined but not a form of 'yes', 'no', '1', '0', '¬' or blank",
                        "type": "string",
                        "required": false
                }
        }
}
</templatedata>


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.<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox||
<includeonly>
[[Category:Lua metamodules]]
{{#ifeq:{{SUBPAGENAME}}|sandbox | |
}}</includeonly>
<!----CATEGORIES BELOW THIS LINE, PLEASE:---->
[[Category:String manipulation templates]]
}}
</includeonly>

Тренутна верзија на датум 7. фебруар 2021. у 00:12

{{Yesno}} (or {{YesNo}}) evaluates any input and produces a normalized yes or no, based on the content of the input and several configurable options. It is not used in article prose, but in coding complex templates.

Usage

The template distinguishes five different types of input, supplied on the first unnamed parameter:

  1. Yes: Case-insensitive forms of Yes, y, true, and 1; e.g. {{Yesno|yEs}}
  2. No: Case-insensitive forms of No, n, false, and 0; e.g. {{Yesno|nO}}
  3. Nothing: When the input is defined but either contains no value or consists of whitespace character only; i.e. {{Yesno|}} or {{Yesno| }}
  4. Negation: When the input is either ¬ or entirely missing; i.e. {{Yesno|¬}} or {{Yesno}}
  5. Anything else: e.g. {{Yesno|Purple monkey dish washer}}

By default, the template returns "yes" in the first and last case but returns blank in the other cases.

Two short-hand templates for the most common uses that override the default behavior:

  • {{yesno-yes}} or {{YesNo-Yes}} – always returns "yes" (or the specified replacement result in |yes=) unless an explicit negative value is given; i.e., it evaluates to "yes" even when the value is empty or missing.
  • {{yesno-no}} or {{YesNo-No}} – always returns "no" (or the specified replacement result in |no=) unless an explicit positive value is given; i.e., it evaluates to "no" even when the value is present, as long as it does not contain anything that resolves to "yes".

Customizing the output

Template's default output can be customized with five named parameters, respectively: |yes=, |no=, |blank=, |¬= and |def=. If these parameters are specified, the template response is as follows:

  1. Yes: Template returns the contents of |yes=, otherwise returns "yes". For example:
    • {{yesno|y|yes=Yeah}} results in "Yeah"
    • {{yesno|y|yes=bacon}} results in "bacon"
  2. No: Template returns the contents of |no=, otherwise returns blank. For example:
    • {{yesno|n|no=Nay}} results in "Nay"
    • {{yesno|n|no=ham}} results in "ham"
  3. Nothing: Template returns the contents of |blank=, or of |no= in absence of the former; otherwise, returns blank.
    • {{yesno|blank=eggs}} results in "eggs"
    • {{yesno|no=ham}} results in "ham"
    • {{yesno|blank=eggs|no=ham}} results in "eggs"
  4. Negation: Template returns the contents of |¬=, otherwise returns blank. For example:
    • {{yesno|¬|¬=sausage}} results in "sausage"
  5. Anything else: Template returns the contents of |def=, or of |yes= in absence of the former; otherwise, returns "yes".
    • {{yesno|purple monkey dish washer|def=cup of tea}} results in "cup of tea"
    • {{yesno|purple monkey dish washer|yes=bacon}} results in "bacon"
    • {{yesno|purple monkey dish washer|def=cup of tea|yes=bacon}} results in "cup of tea"

For the named parameters, use of a blank value is not the same as omitting the parameter. Blank named parameters tells the template that the customized return value is blank. For example:

  • {{yesno|purple monkey dish washer}} results in "yes"
  • {{yesno|purple monkey dish washer|def=}} results in "" [blank]

Logical distinctions

Overview of {{yesno}} logical values and their associated texts
Input
parameter 1
(1=)
In code Logical return value Default
return text
Return text when set:
yes=Pos
no=Neg
blank=Blank
¬=Undefined
def=Def
Note
yes, y, true, 1* {{yesno|yes}} yes by definition "yes" "Pos" * Case-insensitive (Y=y)
Some Text {{yesno|Some Text}} yes by default "yes" "Def" "Pos" when def=[omitted]
no, n, false, 0* {{yesno|no}} no by definition "" [blank] "Neg" * Case-insensitive (N=n)
[blank] {{yesno|}} blank "" [blank] "Blank" "Neg" when blank=[omitted]
1=[blank] {{yesno|1=}} blank "" [blank] "Blank" "Neg" when blank=[omitted]
¬ {{yesno|¬}} ¬ "" [blank] "Undefined"
[omitted] {{yesno}} ¬ "" [blank] "Undefined"

Full parameter list

Unnamed parameter 1= the input value to be evaluated. The other parameters (all named, all optional), are the return values for their respective logical outcome. When set, each one overrules their default return value.

{{yesno
|
| yes  =
| no   =
| blank=
| ¬    =
| def  =
}}

See also

TemplateData

Ово је TemplateData документација за овај шаблон, коришћена у Визуелном уређивачу и у другим алаткама; погледајте месечни извештај о грешкама за овај шаблон.

TemplateData за Yesno

This template normalises an input to be a yes/no output.

Параметри шаблона

ПараметарОписВрстаСтатус
Input value1

The value to be evaluated

текстобавезно
Output on yesyes

Specifies the output of the template when the input value is a case-insensitive forms of 'Yes', 'Y', 'True' or '1'

текстнеобавезно
Output on nono

Specifies the output of the template when the input value is a case-insensitive forms of 'No', 'N', 'False, or '0'

текстнеобавезно
Output on blank inputblank

Specifies the output of the template when the input value is defined but is either empty or contains nothing but whitespace character(s)

текстнеобавезно
Output on ¬¬

Specifies the output of the template when the input value is either '¬' or entirely missing (undefined)

текстнеобавезно
Definite outputdef

Specifies the output of the template when the input value is defined but not a form of 'yes', 'no', '1', '0', '¬' or blank

текстнеобавезно