Manuel:Modèles de pages de contenu

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Le ContentHandler introduit dans MediaWiki 1.21 vous permet d'ajouter de nouveaux modèles de contenu qui ne sont pas du wikicode. It makes it possible for wiki pages to be composed of data other than wikitext, and represented in any way — for example: Markdown, reStructuredText, icalendar, or a custom XML format. 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).

Cette page décrit les étapes à parcourir pour créer un nouveau modèle de contenu dans une extension. 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. Vous pouvez aussi examiner l'extension DataPages, qui est une partie de Extension:Example .

Enregistrement

D'abord, ajoutez le nom du modèle de contenu de la classe du gestionnaire à votre 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'. Cette valeur est exposée aux utilisateurs à des endroits tels que Special:ChangeContentModel et les informations de page.
  • The right-hand value is the fully-qualified name of a class that extends ContentHandler.

Ceci nécessite que deux nouvelles classes, \MediaWiki\Extension\GoatExt\GoatContent et \MediaWiki\Extension\GoatExt\GoatContentHandler, soient ajoutées à AutoloadClasses (si leur espace de noms n'est pas dans AutoloadNamespaces). D'autres informations concernant ces classes sont données ci-dessous.

Constantes optionnelles du modèle de contenu

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. Si vous ne les avez pas définis, ceci peut être un peu gênant. La définition doit être faite via la fonction de rappel (callback) dans extension.json. Par exemple :

Dans extension.json :

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

Dans includes/Hooks.php :

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' );
    }
}

Vous ne devez pas le faire de cette façon, mais simplement utiliser la chaîne de caractères.

Assigner des modèles de contenu aux pages

Si vous voulez que l'espace de noms entier d'un wiki ait un modèle de contenu par défaut, vous pouvez le définir comme tel dans extension.json :

"namespaces": [
	{
		"id": 555,
		"constant": "NS_GOAT",
		"name": "Goat",
		"subpages": false,
		"content": true,
		"defaultcontentmodel": "goat"
	},
	{
		"id": 556,
		"constant": "NS_GOAT_TALK",
		"name": "Goat_talk",
		"subpages": true,
		"content": false,
		"defaultcontentmodel": "wikitext"
	}
]

Or 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 extension) 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;
	}
}

Gestionnaire de contenu

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;
	}
}

Contenu

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';
	}
}

Formulaire de modification

Maintenant que nous avons configuré le squelette, nous allons essayer de modifier une chèvre. Pour faire ceci, nous créons GoatContentHandler::getActionOverrides() en spécifiant quelles actions que nous voulons associer aux 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->page );
		$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 \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.

Affichage

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 );
	}

}

Afficher une description/documentation

Sometimes you may want to display some informations or some documentation for an article that have a custom content model such as JSON. Actually there aren't system messages to display some text above such pages (with the exception of MediaWiki:Clearyourcache displayed above only JavaScript and CSS pages). You may want to see phab:T206395 for further details.

Comparer les versions

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;
	}
}

Résumé

Pour implémenter un nouveau modèle de contenu avec un formulaire d'édition personnalisé, créez ceci :

<?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() {}
}

Voir aussi