MMLDomVisitor.php
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MMLDomVisitor.php
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	<?php
	namespace MediaWiki\Extension\Math\WikiTexVC\MMLnodes;

	use DOMDocument;
	use DOMElement;
	use DOMNode;

	class MMLDomVisitor implements MMLVisitor {
	private DOMDocument $dom;
	/** @var DOMNode[] */
	private array $elementStack = [];

	public function __construct() {
	$this->dom = new DOMDocument( '1.0', 'UTF-8' );
	$this->dom->formatOutput = true;
	$this->dom->preserveWhiteSpace = false;
	$this->elementStack[] = $this->dom;
	}

	/**
	* Visit an MMLbase node and process it.
	* @param MMLbase $node Node to visit
	* @throws \DOMException
	*/
	public function visit( MMLbase $node ): void {
	$element = $this->createElement( $node );
	end( $this->elementStack )->appendChild( $element );
	if ( $node instanceof MMLleaf ) {
	$textNode = $this->dom->createTextNode( $node->getText() );
	$element->appendChild( $textNode );
	return;
	}
	$this->elementStack[] = $element;
	foreach ( $node->getChildren() as $child ) {
	if ( $child !== null ) {
	// implicitly calls visit
	$child->accept( $this );
	}
	}
	array_pop( $this->elementStack );
	}

	/**
	* Get HTML from current node
	* @return string
	*/
	public function getHTML(): string {
	return trim( $this->dom->saveHTML() );
	}

	/**
	* Create DOMElement from MMLbase node
	* @param MMLbase $node
	* @return DOMElement
	* @throws \DOMException
	*/
	private function createElement( MMLbase $node ): DOMElement {
	$element = $this->dom->createElement( $node->getName() );
	foreach ( $node->getAttributes() as $name => $value ) {
	$element->setAttribute( $name, htmlspecialchars( $value, ENT_QUOTES ) );
	}
	return $element;
	}
	}