Extension:Loops/zh

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Loops
发布状态: 稳定版
实现 解析器函数
描述 Provides parser functions for performing loops
作者 David M. Sledge (talk),
Daniel Werner
最新版本 0.5.0 (2014-04-22)
MediaWiki 1.19+
PHP 5.3+
数据庫更新
许可协议 GNU通用公眾授權條款2.0 or later
下载
README
RELEASE-NOTES
  • ExtLoops::$maxLoops
  • $egLoopsEnabledFunctions
翻译Loops扩展如果在translatewiki.net可用
检查使用和版本矩阵。

The Loops extension provides parser functions for performing loops.

用法[edit]

#while[edit]

{{#while}} performs a loop (i.e. it repeatedly parses a given wiki markup block statement) so long as the condition mark-up evaluates to non-whitespace.

{{
  #while:
  | <condition text>
  | <block statement>
}}
Examples

Note: The following examples use the VariablesExtension.

The wiki markup:

{{ #vardefine: i | 0 }}{{
  #while:
  | {{ #ifexpr: {{ #var: i }} < 5 | true }}
  |
* {{ #var: i }}{{ #vardefine: i | {{ #expr: {{ #var: i }} + 1 }} }}
}}

produces the following:

  • 0
  • 1
  • 2
  • 3
  • 4

{{#while}} can also be used in a template to simulate a numbered array. If the page "Template:Loops Test" contains

{{
  #vardefine: i | 0
}}{{
  #while:
  | {{{ arg{{#var: i }} |}}}
  |
* {{{ arg{{#var: i }} }}}{{
    #vardefine: i
    | {{ #expr: {{ #var: i }} + 1 }}
  }}
}}

then the wiki-markup

{{Loops Test
|arg0=zero
|arg1=one
|arg2=two
|arg3=three
|arg4=four
}}

produces

  • zero
  • one
  • two
  • three
  • four

It's important to note that whitespace, including newlines, tabs, and spaces, is stripped from the beginning and end of all the arguments of these parser functions. If this is not desirable, adding any non-whitespace characters (including the HTML encoding for a whitespace character &#32;) will prevent further stripping (hence the <nowiki/> tags in the above examples).

#dowhile[edit]

{{#dowhile}} performs exactly like {{#while}}, with the exception that the block statement is guaranteed to be parsed and displayed (if it results in displayable text) at least once. This is done before the condition text is evaluated.

#loop[edit]

{{
  #loop: <variable name>
  | <starting value>
  | <number of loops to be performed>
  | <wiki markup>
}}

{{#loop}} repeatedly parses and displays <wiki markup> a number of times equal to the absolute value of <number of loops to be performed>. <Starting value> is placed in a variable (accessible by VariablesExtension's {{#var:}} parser function) using the name <variable name>. After each loop, the variable is incremented by one if <number of loops to be performed> is positive, or decremented by one if <number of loops to be performed> is negative.

Note: From all loop functions, #loop should have the best performance since there is no condition which has to be expanded and validated for each cycle.

Examples

The following code:

{{#loop: varname
  | 4
  | 4
  | 
* This is round {{#var:varname}} and we have {{#expr: 7- {{#var:varname}}}} more to go
}}

produces

  • This is round 4 and we have 3 more to go
  • This is round 5 and we have 2 more to go
  • This is round 6 and we have 1 more to go
  • This is round 7 and we have 0 more to go

#forargs (Experimental)[edit]

{{#forargs}} is to be used in templates. It takes arguments that are passed to the template and puts them in variables accessible by VariablesExtension's {{#var:}} parser function.

{{
  #forargs: <prefix>
  | <key>
  | <value>
  | <block statement>
}}

This function iterates through each argument whose name begins with <prefix>. With each iteration it puts the argument name minus <prefix> into <key> as if calling {{#vardefine: <key> }}. It then takes the value of the argument and puts it into <value> in a similar method. The block statement is then expanded. The block statement may contain {{#var: <key> }} and {{#var: <value> }} to access the stored arguments.

Example

If the page "Template:Loops Test" contains

{{
  #forargs: arg
  | key
  | value
  | 
* {{#var: key}} = {{#var: value}}
}}

then the wiki markup

{{Loops Test
| arg1=val1
| spam=spammity
| arg5=val5
| argument=value
}}

produces

  • 1 = val1
  • 5 = val5
  • ument = value

#fornumargs (Experimental)[edit]

{{
  #fornumargs: <key>
  | <value>
  | <block statement>
}}

{{#fornumargs}} performs similarly to {{#forargs}} with two major differences: It doesn't take a prefix argument, and it only works on numbered arguments whether they're explicitly numbered,

{{Template | 1=one | 2=two }}

or implicitly numbered.

{{Template | one | two }}

Mixing these methods in a single template call may cause values to get overwritten, so be careful.

Examples

If "Template:Loops Test" is editted to contain:

{{
  #fornumargs: number
  | value
  | 
* {{#var: number}} = {{#var: value}}
}}

then

{{Loops Test
  | Apricot
  | B = Bolognese
  | Caramel slice
  | 5 = Eclair
}}

will result in

  • 1 = Apricot
  • 2 = Caramel slice
  • 5 = Eclair

安装[edit]

注意 注意: Some of the parser functions provided by this extension require the Variables extension to be installed first.

  • 下载文件,并将其放置在您extensions/文件夹中的Loops目录内。

Configuration[edit]

These configuration variables have to be set in the "LocalSettings.php" file after the inclusion of this extension.

ExtLoops::$maxLoops
This parameter sets the maximum number of loops a page is allowed to perform (default 100). Setting it to -1 lets the loops run within the limits of phps environment. This parameter affects neither the {{#forargs:}} nor {{#fornumargs:}} parser functions.
$egLoopsEnabledFunctions
Configuration variable (array) to define which Loops functions should be enabled. By default, all functions are enabled if the Variables extension is installed as well. If the Variables extension is not installed, #loop, #forargs and #fornumargs will be disabled since they don't work without. To enable the fornumargs and forargs functions only, one can use:
$egLoopsEnabledFunctions = array_diff(
    $egLoopsEnabledFunctions, array(
        'forargs', 'fornumargs'
        )
    );

參見[edit]