Extension:Loops/zh
Loops 发布状态: 稳定版 |
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实现 | 解析器函数 |
描述 | Provides parser functions for performing loops |
作者 | |
最新版本 | 0.5.2 (2019-08-05) |
MediaWiki | 1.34+ |
PHP | 5.6+ |
数据庫更改 | 否 |
许可协议 | GNU通用公眾授權條款2.0或更新版本 |
下载 | README RELEASE-NOTES |
例子 | sandbox.semantic-mediawiki.org |
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翻譯Loops擴充功能如在translatewiki.net可用 | |
问题 | 尚未完成的工作 · 回報錯誤 |
The Loops extension provides parser functions for performing loops. Currently, version 1.0.0 is in development, that will feature extension registration, tracking categories for pages with too many loops, and 解析器测试 to avoid regressions. The documentation below targets the latest stable release, v0.5.2.
Usage
#while
{{#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
The wiki markup:
{{#vardefine: i | 0 }}{{#while: | {{#ifexpr: {{#var: i }} < 5 | true }} | <nowiki /> * {{#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 }} |}}} | <nowiki /> * {{{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  
) will prevent further stripping (hence the <nowiki/> tags in the above examples).
#dowhile
{{#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
{{#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 Variables extension'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 | <nowiki /> * 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)
{{#forargs}}
is to be used in templates. It takes arguments that are passed to the template and puts them in variables accessible by Variables extension'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 | <nowiki /> * {{#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)
{{#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 edited to contain:
{{#fornumargs: number | value | <nowiki /> * {{#var: number }} = {{#var: value }} }}
then
{{Loops Test | Apricot | B = Bolognese | Caramel slice | 5 = Eclair }}
will result in
- 1 = Apricot
- 2 = Caramel slice
- 5 = Eclair
Installation
- 下载文件,并将其放置在您
extensions/
文件夹中的Loops
目录内。 - 将下列代码放置在您的LocalSettings.php的底部:
wfLoadExtension( 'Loops' );
- Configure at your convenience
- 完成 – 在您的wiki上导航至Special:Version,以验证扩展已成功安装。
Configuration
These configuration variables have to be set in the "LocalSettings.php" file after the inclusion of this extension.
ExtLoops::$maxLoops
($egLoopsCountLimit
in the forthcoming 1.0.0 release)- 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 do not work without it being installed. To enable the#fornumargs
and#forargs
functions only, one can use:
$egLoopsEnabledFunctions = array_diff(
$egLoopsEnabledFunctions, [
'forargs', 'fornumargs'
]
);
See also
- LoopFunctions - Another extension for loops