模板:Yesno/doc

Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted

Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted (or Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted) evaluates any input and produces a normalized yes or nil output, based on the content of the input and several configurable options.

Usage

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

1. Yes: Case-insensitive forms of Yes, y, true, on, and 1; e.g. Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted → yes
2. No: Case-insensitive forms of No, n, false, off, and 0; e.g. Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted →
3. Nothing: When the input is defined but either contains no value or consists of whitespace character only; i.e. {{Yesno|}} or Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted →
4. Negation: When the input is either ¬ (alt code 170) or entirely missing; i.e. Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted or Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted →
5. Anything else: e.g. Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted → yes

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:

• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted or Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted – 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.
• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted or Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted – 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:
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "Yeah"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "bacon"
2. No: Template returns the contents of |no=, otherwise returns blank. For example:
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "Nay"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "ham"
3. Nothing: Template returns the contents of |blank=, or of |no= in absence of the former; otherwise, returns blank.
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "eggs"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "ham"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "eggs"
4. Negation: Template returns the contents of |¬=, otherwise returns blank. For example:
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "sausage"
5. Anything else: Template returns the contents of |def=, or of |yes= in absence of the former; otherwise, returns "yes".
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "cup of tea"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "bacon"
   • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "cup of tea"

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:

• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "yes"
• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted results in "" [blank]

Logical distinctions

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.

See also

• 表达式错误：未预料的<操作符。Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted
• Module:yesno
• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted – variant of Yesno that defaults to "yes" if value is not explicitly negative
  • Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted – variant that first defaults to the yes parameter, then falls back to "yes", if value is not explicitly negative
• Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted – variant of Yesno that defaults to "no" if value is not explicitly positive

TemplateData

Lua错误：无法创建进程：proc_open(/dev/null): failed to open stream: Operation not permitted

<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
               }
       }

} </templatedata>