Manual:Page content models/ja

MediaWiki 1.21 で導入された ContentHandler では、ウィキテキスト以外の新しいコンテンツモデルを追加できるようにします。 これにより、ウィキ ページをウィキテキスト以外のデータで構成したり、任意の方法で表現できるようになります。Markdown、reStructuredText、icalendar、カスタム XML 形式などです。 The display and editing of these content models can be handled in custom ways (e.g. different syntax highlighting, or whole new data-entry forms).

このページでは、拡張機能で新しいコンテンツ モデルを作成する方法を説明します。 It assumes some familiarity with general extension development practices. For a brief summary of the requirements, see the Summary section at the bottom of this page.

A meaningless "Goat" content model will be used for the examples. また、Extension:Examples の一部である DataPages 拡張機能を調べることもできます。

警告:	Some sections of this page are outdated. In MW 1.38, Content::getParserOutput and AbstractContent::fillParserOutput were hard-deprecated in favour of ContentRenderer::getParserOutput. Extensions defining a content model should override ContentHandler::fillParserOutput.

登録

First of all, add the content model's name and handler class to your extension.json:

"ContentHandlers": {
	"goat": "MediaWiki\\Extension\\GoatExt\\GoatContentHandler"
}

• The left-hand value here is the name of the content type, it can be any unique string you want, and it lives alongside the five built-in content types: 'wikitext', 'JavaScript', 'CSS', 'plain text', 'JSON'. This value is exposed to users in places such as Special:ChangeContentModel and page information.
• The right-hand value is the fully-qualified name of a class that extends ContentHandler.

This will require two new classes to be created, such as \MediaWiki\Extension\GoatExt\GoatContent and \MediaWiki\Extension\GoatExt\GoatContentHandler (make sure their namespace is registered in AutoloadNamespaces). More information about these classes is given below.

Optional content model constants

The 'goat' string above is the content model's ID (generally called $modelId in code), and is usually also defined as a constant. These constants are defined for all built-in content models, and lots of documentation refers to the "CONTENT_MODEL_XXX" constants. それらを定義していない場合、これは少し混乱するかもしれません。 The definition should be done via the callback item in extension.json. For example:

extension.json 内:

"callback": "MediaWiki\\Extension\\GoatExt\\Hooks::registrationCallback"

includes/Hooks.php 内:

namespace MediaWiki\Extension\GoatExt;
class Hooks {
    public static function registrationCallback() {
        // Must match the name used in the 'ContentHandlers' section of extension.json
        define( 'CONTENT_MODEL_GOAT', 'goat' );
    }
}

You don't have to do it this way, and could just use the string.

ページにコンテンツモデルを割り当てる

Pages can have their content type manually changed, but it's useful to have them default to the correct one. Two common ways of doing this are by namespace, and by file extension.

By namespace: If you want an entire wiki namespace to have a default content model, you can define it as such in extension.json:

"namespaces": [
	{
		"id": 550,
		"constant": "NS_GOAT",
		"name": "Goat",
		"subpages": false,
		"content": true,
		"defaultcontentmodel": "goat"
	},
	{
		"id": 551,
		"constant": "NS_GOAT_TALK",
		"name": "Goat_talk",
		"subpages": true,
		"content": false,
		"defaultcontentmodel": "wikitext"
	}
]

Note that published extensions should register the namespace IDs they use (550 and 551 above) on the 拡張機能の既定の名前空間 page.

By file extension: If you want to determine the content type by the addition of a quasi-file-type suffix on the wiki page name, you can use the ContentHandlerDefaultModelFor hook. For example:

namespace MediaWiki\Extension\GoatExt;
class Hooks {
	public static function onContentHandlerDefaultModelFor( \Title $title, &$model ) {
		// Any page title (in any namespace) ending in '.goat'.
		$ext = '.goat';
		if ( substr( $title->getText(), -strlen( $ext ) ) === $ext ) {
			// This is the constant you defined earlier.
			$model = CONTENT_MODEL_GOAT;
			// If you change the content model, return false.
			return false;
		}
		// If you don't change it, return true.
		return true;
	}
}

ContentHandler

The next thing to define is the GoatContentHandler class, which is where we also specify what format this content type will be stored as (in this case, text). ContentHandlers don't know anything about any particular page content, but determine the general structure and storage of the content.

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContentHandler extends \ContentHandler {

	public function __construct( $modelId = 'goat' ) {
		parent::__construct( $modelId, [ CONTENT_FORMAT_TEXT ] );
	}

	public function serializeContent( \Content $content, $format = null ) {
	}

	public function unserializeContent( $blob, $format = null ) {
	}

	public function makeEmptyContent() {
		return new GoatContent();
	}

	public function supportsDirectEditing() {
		return true;
	}
}

Content

The GoatContent class is the representation of the content's data, and does not know anything about pages, revisions, or how it is stored in the database. Beside the required seven inherited methods, you can add other public methods are domain-specific; in this case we want to be able to retrieve the goat's name.

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContent extends \AbstractContent {

	public function __construct( $modelId = 'goat' ) {
		parent::__construct( $modelId );
	}

	public function getTextForSearchIndex() {
	}

	public function getWikitextForTransclusion() {
	}

	public function getTextForSummary( $maxLength = 250 ) {
	}

	public function getNativeData() {
	}

	public function getSize() {
	}

	public function copy() {
	}

	public function isCountable( $hasLinks = null ) {
	}

	public function getName() {
		return 'Garry';
	}
}

編集フォーム

Now we've got the skeleton set up, we'll want to try editing a Goat. To do this, we create GoatContentHandler::getActionOverrides() and specify what actions we want to map to what classes. To start with, we'll just deal with 'edit' (which corresponds to ?action=edit in the URL).

	public function getActionOverrides() {
		return [
			'edit' => GoatEditAction::class,
		];
	}

And we'll create our new GoatEditAction class, basically the same as the core EditAction but using our own GoatEditPage:

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatEditAction extends \EditAction {

	public function show() {
		$this->useTransactionalTimeLimit();
		$editPage = new GoatEditPage( $this->getArticle() );
		$editPage->setContextTitle( $this->getTitle() );
		$editPage->edit();
	}

}

Our new GoatEditPage class is where the action happens (excuse the pun):

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatEditPage extends \MediaWiki\EditPage\EditPage {

	protected function showContentForm() {
		$out = $this->context->getOutput();

		// Get the data.
		$name = $this->getCurrentContent()->getGoatName();

		// Create the form.
		$nameField = new \OOUI\FieldLayout(
			new \OOUI\TextInputWidget( [ 'name' => 'goat_name', 'value' => $name ] ),
			[ 'label' => 'Name', 'align' => 'left' ]
		);
		$out->addHTML( $nameField );
	}

}

You should now be able to edit a page and see your form. But when you put data into it, and hit 'preview', you'll see that things are not yet working fully and that you get no output, nor is your submitted text shown again in the form.

So we must override the 'submit' action as well, with a new GoatSubmitAction class and the addition of 'submit' => GoatSubmitAction::class, to our GoatContentHandler::getActionOverrides() method. Our GoatSubmitAction class should be the same as that of core, but inheriting from our GoatEditAction.

表示

A content model is responsible for producing any required output for display. This usually involves working with its data and producing HTML in some way, to add to the parser output.

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContent extends \AbstractContent {

	protected function fillParserOutput(
		Title $title, $revId, ParserOptions $options, $generateHtml, ParserOutput &$output
	) {
		// e.g. $output->setText( $html );
	}

}

Display a description/documentation

時には JSON など、その記事に特化したコンテンツ様式を供えていて、情報や解説文書を表示したい場合があります。 Actually there aren't system messages to display some text above such pages (except for MediaWiki:Clearyourcache displayed above only JavaScript and CSS pages). You may want to see phab:T206395 for further details.

Comparing revisions

The GoatDifferenceEngine class is the representation of the difference between goat contents. We override the default generateContentDiffBody method to generate a diff.

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatDifferenceEngine extends \DifferenceEngine {

	public function generateContentDiffBody( Content $old, Content $new ) {
	}
}

In order to tell MediaWiki to use our GoatDifferenceEngine, we overwrite the getDiffEngineClass in our GoatContentHandler.

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContentHandler extends \ContentHandler {

	public function getDiffEngineClass() {
		return GoatDifferenceEngine::class;
	}
}

要約

To implement a new content model with a custom editing form, create the following:

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContent extends \AbstractContent  {
	public function __construct( $modelId = 'goat' ) {
		parent::__construct($modelId);
	}
	protected function fillParserOutput( \Title $title, $revId, \ParserOptions $options, $generateHtml, \ParserOutput &$output) {}
	public function getTextForSearchIndex() {}
	public function getWikitextForTransclusion() {}
	public function getTextForSummary( $maxLength = 250 ) {}
	public function getNativeData() {}
	public function getSize() {}
	public function copy() {}
	public function isCountable( $hasLinks = null ) {}
}

<?php

namespace MediaWiki\Extension\GoatExt;

class GoatContentHandler extends \ContentHandler {	
	public function __construct( $modelId = CONTENT_MODEL_GOAT, $formats = ['text/x-goat'] ) {
		parent::__construct($modelId, $formats);
	}
	protected function getContentClass() {}
	public function supportsDirectEditing() {}
	public function serializeContent( \Content $content, $format = null ) {}
	public function unserializeContent( $blob, $format = null ) {}
	public function makeEmptyContent() {}
	public function getActionOverrides() {}
}

関連項目

• Manual:Hooks/ContentHandlerDefaultModelFor
• Help:ChangeContentModel - for end-user documentation about changing a content model.
• Extension:Examples - for an example of a custom content model (but not yet any custom editing form).