Template:Yesno/doc

(or ) evaluates any input and produces a normalized yes or nil output, 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 ,  ,  ,  , and  ; e.g.  &rarr;
 * 2) No: Case-insensitive forms of ,  ,  ,  , and  ; e.g.  &rarr;
 * 3) Nothing: When the input is defined but either contains no value or consists of whitespace character only; i.e.   or  &rarr;
 * 4) Negation: When the input is either   or entirely missing; i.e.  or  &rarr;
 * 5) Anything else: e.g.  &rarr;

By default, the template returns "yes" in the first and last case but returns nil (blank, empty string) in the other cases.

Two short-hand templates for the most common uses that override the default behavior:
 * or – 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.
 * or – 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:
 * 2) * results in ""
 * 3) *  results in ""
 * 4) No: Template returns the contents of no, otherwise returns blank. For example:
 * 5) * results in ""
 * 6) * results in ""
 * 7) Nothing: Template returns the contents of blank, or of no in absence of the former; otherwise, returns blank.
 * 8) * results in ""
 * 9) * results in ""
 * 10) * results in ""
 * 11) Negation: Template returns the contents of ¬, otherwise returns blank. For example:
 * 12) * results in ""
 * 13) Anything else: Template returns the contents of def, or of yes in absence of the former; otherwise, returns "yes".
 * 14) * results in ""
 * 15) * results in ""
 * 16) * results in ""

For the named parameters, use of a blank value is not the same as omitting the parameter. A blank named parameter tells the template that the customized return value is blank. For example:
 * results in ""
 * results in "" [blank]

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.

TemplateData
{       "description": "This template normalises an input to be a yes or nil output.", "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 }       } }