Extension:Scribunto/ru

Расширение Scribunto (лат.: «пусть они напишут») позволяет встраивать в страницы MediaWiki модули, написанные на сценарных языках программирования. На данный момент единственный поддерживаемый язык программирования — Lua.

Лицензия
Это расширение содержит код, распространяемый по лицензии GNU General Public License v2.0 или более поздней версии (GPL-2.0+), а также код, распространяемый по лицензии MIT License (MIT).

Совместимость с версиями PCRE
Рекомендуется версия PCRE 8.33+. Вы можете просмотреть используемую PHP версию PCRE на веб-странице phpinfo, или из командной строки, выполнив следующую команду:


 * Scribunto не будет работать, если установлена версия PCRE раньше 8.10.
 * В PCRE 8.31 содержится ошибка с JIT-разбором паттернов, которая приводит к неработоспособности некоторых паттернов при использовании HHVM.
 * В PCRE 8.32 есть ошибка, ввиду которой эта библиотека не может принимать некоторые несимвольные позиции Юникода, что приводит к ошибкам в модуле mw.html.

Операционные системы CentOS 6 и RHEL 6 ограничены версией PCRE 7 и должны быть обновлены для работы со Scribunto.

Обновление до версии 8.33 на сервере, использующем более старую версию, может быть проблематично. Смотрите статью обновление на PCRE 8.33 или выше для подробностей о таком обновлении.

Расширение PHP pcntl (LTS)
Версии Scribunto для MediaWiki 1.25 — 1.28 требовали наличия расширения pcntl для PHP, которое доступно только на платформах под управлением ОС Unix/Linux. Это требование действовало только при использовании LuaStandalone (т. е. выполнении Lua в отдельном дочернем процессе). Это расширение сделано необязательным в Scribunto для MediaWiki 1.29.

Вы можете просмотреть, включена ли поддержка pcntl, на веб-странице phpinfo, или из командной строки, выполнив следующую команду:

PHP mbstring extension
PHP needs to have the mbstring extension enabled.

You can check whether mbstring support is enabled by viewing a phpinfo web page, or from the command line with the following command:

Bundled binaries
Scribunto comes bundled with Lua binary distributions for Linux (x86 and x86-64), Mac OS X Lion, and Windows (32- and 64-bit).

Scribunto should work for you out of the box if:
 * 1) Your web server is run on one of the above platforms.
 * 2) PHP's   function is not restricted
 * 3) Your web server is configured to allow the execution of binary files in the MediaWiki tree.
 * Execute permissions may need to be set; for example, in Linux use
 * If you are using SELinux in "Enforcing" mode on your server, you might need to set a proper context for the binaries. Example for RHEL/CentOS 7:

Additional binaries
Additional Lua binary distributions, which may be needed for your web server if its operating system is not in the list above, can be obtained from http://luabinaries.sourceforge.net/ or from your Linux distribution. Only binary files for Lua 5.1.x are supported. Once you've installed the appropriate binary file on your web server, configure the location of the file with:

Note that you should not add the above line unless you've confirmed that Scribunto's built-in binaries don't work for you.

Integrating extensions
For a more pleasant user interface, with syntax highlighting and a code editor with autoindent, install the following extensions:
 * Extension:WikiEditor
 * Extension:SyntaxHighlight
 * Extension:CodeEditor

(MediaWiki 1.30 or earlier)Then in your LocalSettings.php after all the extension registrations, add:

LuaSandbox
Мы разработали написанное на C расширение для PHP под названием LuaSandbox. Это расширение может быть использовано как альтернатива отдельному исполняемому файлу и обеспечивает более высокую производительность. См. для подробностей об этом расширении и инструкции по его установке.

Если вы изначально устанавливали Scribunto для работы с отдельным двоичным файлом Lua, вам потребуется добавить в LocalSettings.php строку.

Настройка
Доступны следующие переменные конфигурации:
 * $wgScribuntoDefaultEngine : Выбирает тип движка. Допустимые значения — ключи массива $wgScribuntoEngineConf, по умолчанию это 'luasandbox' и 'luastandalone'.
 * $wgScribuntoUseGeSHi : Если установлено, задайте эту переменную как true, чтобы это расширение использовалось при отображении модулей.
 * $wgScribuntoUseCodeEditor : Если установлено, задайте эту переменную как true, чтобы это расширение использовалось при редактировании модулей.
 * $wgScribuntoEngineConf : Ассоциативный массив для настройки движков. Ключи — допустимые значения переменной $wgScribuntoDefaultEngine, а значения — ассоциативные массивы с параметрами конфигурации. Каждый массив конфигурации должен содержать ключ 'class', называющий используемый подкласс класса ScribuntoEngineBase.

LuaStandalone
В $wgScribuntoEngineConf для Scribunto_LuaStandaloneEngine используются нижеперечисленные ключи. Обычно их задают примерно таким способом:


 * luaPath: Указывает путь к интерпретатору Lua.
 * errorFile:
 * Указывает путь к файлу, к которому учётная запись веб-сервера имеет доступ на запись. В этот файл будут записываться ошибки и отладочный вывод самостоятельного интерпретатора.
 * По умолчанию не ведётся запись ошибок, выводимых самостоятельным интерпретатором. Вы можете настроить эту запись как в следующей строке:


 * memoryLimit: Указывает ограничение памяти в байтах, применяемое к процессу самостоятельного интерпретатора на Linux (осуществляется средствами ulimit).
 * cpuLimit: Указывает ограничение времени ЦП в секундах, применяемое к процессу самостоятельного интерпретатора на Linux (осуществляется средствами ulimit).
 * allowEnvFuncs: Задайте как true, чтобы разрешить использование в модулях функций setfenv и getfenv.

LuaSandbox
В $wgScribuntoEngineConf для Scribunto_LuaSandboxEngine используются нижеперечисленные ключи. Обычно их задают примерно таким способом:

$wgScribuntoEngineConf['luasandbox']['key'] = 'value';


 * memoryLimit : Specify the memory limit in bytes.
 * cpuLimit : Specify the CPU time limit in seconds.
 * profilerPeriod : Specify the time between polls in sections for the Lua profiler.
 * allowEnvFuncs : Set true to allow use of setfenv and getfenv in modules.

Usage
Scripts go in a new namespace called Module. Each module has a collection of functions, which can be called using wikitext syntax such as:

Learning Lua
Lua is a simple programming language intended to be accessible to beginners. For a quick crash-course on Lua, try Learn Lua in 15 Minutes.

The best comprehensive introduction to Lua is the book Programming in Lua. The first edition (for Lua 5.0) is available online and is mostly relevant to Lua 5.1, the version used by Scribunto:
 * Programming in Lua (scroll down past the book ads to find the text)

The reference manual is also useful:

Lua environment
In Lua, the set of all global variables and functions is called an environment.

Each call runs in a separate environment. Variables defined in one will not be available from another. This restriction was necessary to maintain flexibility in the wikitext parser implementation.

Debug console

 * See also 

When editing a Lua module a so called "debug console" can be found underneath the edit form. In this debug console Lua code can be executed without having to save or even create the Lua module in question.

Troubleshooting
Note that red Lua error messages are clickable and will provide more detailed information.

Lua error: Internal error: The interpreter exited with status 1
When using the LuaStandalone engine (this is the default), errors along the lines of "Lua error: Internal error: The interpreter exited with status 1" may be generated if the standalone Lua interpreter cannot be executed or runs into various runtime errors. To obtain more information, assign a file path to. The interpreter's error output will be logged to the specified file, which should prove more helpful in tracking down the issue. The information in the debug log includes debugging information, which is why there is so much of it. You should be able to ignore any line beginning with "TX" or "RX".

Lua error: Internal error: The interpreter exited with status 2
When using the LuaStandalone engine (this is the default), status 2 suggests memory allocation errors, probably caused by settings that allocate inadequate memory space for PHP or lua, or both. Assigning a file path to  and examining that output can be valuable in diagnosing memory allocation errors.

Increase PHP allocation in your PHP configuration; add the line memory_limit = 200M. This allocation of 200MB is often sufficient (as of MediaWiki 1.24) but can be increased as required. Set Scribunto's memory allocation in LocalSettings.php as a line: Finally, depending on the server configuration, some installations may be helped by adding another LocalSettings.php line Note that all 3 memory limits are given in different units.

Lua error: Internal error: The interpreter exited with status 24
When using the LuaStandalone engine (this is the default), status 24 suggests CPU time limit errors, although those should be generating a "The time allocated for running scripts has expired" message instead. It would be useful to file a task in Phabricator and participate in determining why the XCPU signal isn't being caught.

Lua error: Internal error: The interpreter exited with status 126
When using the LuaStandalone engine (this is the default), errors along the lines of "Lua error: Internal error: The interpreter exited with status 126" may be generated if the standalone Lua interpreter cannot be executed. This generally arises from either of 2 causes:
 * The lua executable file's permissions do not include Execute. Set permissions as described under.
 * The server does not allow execution of files from the place where the executable is installed, e.g. the filesystem is mounted with the 'noexec' flag. This often occurs with shared hosted servers. Remedies include adjusting  to point to a Lua 5.1 binary installed in an executable location, or adjusting or convincing the shared host to adjust the setting preventing execution.

Error condition such as: Fatal exception of type MWException
Check the MediaWiki, PHP, or webserver logs for more details on the exception, or temporarily set to true.

version `GLIBC_2.11' not found
If the above gives you errors such as "version `GLIBC_2.11' not found", it means the version of the standard C library on your system is too old for the binaries provided with Scribunto. You should upgrade your C library, or use a version of Lua 5.1 compiled for the C library you do have installed. To upgrade your C library, your best option is usually to follow your distribution's instructions for upgrading packages (or for upgrading to a new release of the distribution, if applicable).

If you copy the lua binaries from Scribunto master (or from 77905), that should suffice, if you can't or don't want to upgrade your C library. The distributed binaries were recently recompiled against an older version of glibc, so the minimum is now 2.3 rather than 2.11.

Lua errors in Scribunto files
Errors here include:
 * attempt to index field 'text' (a nil value)
 * Lua error in mw.html.lua at line 253: Invalid class given:

If you are getting errors such these when attempting to use modules imported from WMF wikis, most likely your version of Scribunto is out of date. Upgrade if possible; for advanced users, you might also try to identify the needed newer commits and cherry-pick them into your local installation.

preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7

 * this usually indicates an incompatible version of PCRE; you’ll need to update to >= 8.10
 * @todo: link to instructions on how to upgrade

Lua error
If you copy templates from Wikipedia and then get big red "Lua error: x" messages where the Scribunto invocation (e.g. the template that uses ) should be, that probably means that you didn't import everything you needed. Make sure that you tick the "Include templates" box at w:Special:Export when you export.

When importing pages from another wiki, it is also possible for templates or modules in the imported data to overwrite existing templates or modules with the same title, which may break existing pages, templates, and modules that depend on the overwritten versions.

Blank screen
Make sure your extension version is applicable to your MediaWiki version.

Design documents

 * Linux.conf.au 2014 - Scribunto presentation.webm's presentation at linux.conf.au 2014 discussing the motivations, implementation challenges and results of deploying Scribunto and Lua.]]

Другие страницы

 * - Wikimedia activity page describing deployment plan to Wikimedia sites
 * - The reference about the Lua language, as well as its standard libraries and common Scribunto modules supported on Wikimedia sites
 * - A list of known changes in Lua 5.2 that may cause code written in 5.1 to function unexpectedly
 * - Code for example extensions extending the Scribunto library.
 * - A list of known changes in Lua 5.2 that may cause code written in 5.1 to function unexpectedly
 * - Code for example extensions extending the Scribunto library.
 * - Code for example extensions extending the Scribunto library.

Смотрите также

 * General
 * - functionality for the Scribunto extension.
 * commons:Commons:Lua - there may be specific notes for using Lua modules on Wikimedia Commons, including additional Lua extensions installed (e.g. for local support of internationalization and for parsing or playing medias). Some general purpose modules may be reused in other wikis in various languages (except specific tunings for policies, namespaces or project/maintenance pages with dedicated names). If possible, modules that could be widely reused across wikis should be tested and internationalized on Commons.
 * wikipedia:Help:Lua - there may be specific notes for using Lua modules on (English) Wikipedia, including additional Lua extensions installed (including for integrating Wikidata and Wikimedia Commons contents, generating complex infoboxes and navigation boxes, or to facilitate the general administration/maintenance of the wiki contents under applicable policies). Some other localized Wikipedia editions (or other projects such Wiktionnary, Wikisource or Wikinews) may also have their own needs and Lua modules.
 * wikidata:Help:Lua - there may be specific notes for using Lua modules on Wikidata, including additional Lua extensions installed (e.g. for local support of internationalization and for database queries)
 * Extensions
 * - Provides basic Infobox functionality for the Scribunto extension.
 * - provides native support for the Scribunto extension for usage with
 * - provides a Scribunto Lua interface for the Variables extension
 * - Provides Wikibase (part of Wikidata project)