HtmlHelperTrait.php

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<?php
 
namespace MediaWiki\Html;
 
use Wikimedia\Assert\Assert;
use Wikimedia\RemexHtml\Serializer\SerializerNode;
 
trait HtmlHelperTrait {
    private $shouldModifyCallback;
 
    private $modifyCallback;
 
    public function __construct( $options, callable $shouldModifyCallback, callable $modifyCallback ) {
        parent::__construct( $options );
        $this->shouldModifyCallback = $shouldModifyCallback;
        $this->modifyCallback = $modifyCallback;
    }
 
    public function element( SerializerNode $parent, SerializerNode $node, $contents ) {
        if ( ( $this->shouldModifyCallback )( $node ) ) {
            $node = clone $node;
            $node->attrs = clone $node->attrs;
            $newNode = ( $this->modifyCallback )( $node );
            Assert::parameterType( SerializerNode::class, $newNode, 'return value' );
            return parent::element( $parent, $newNode, $contents );
        } else {
            return parent::element( $parent, $node, $contents );
        }
    }
 
    public function startDocument( $fragmentNamespace, $fragmentName ) {
        return '';
    }
}