MathDataUpdater.php
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MathDataUpdater.php
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	<?php

	namespace MediaWiki\Extension\Math;

	use MediaWiki\Parser\ParserOutput;
	use Wikibase\DataModel\Services\Entity\PropertyDataTypeMatcher;
	use Wikibase\DataModel\Statement\Statement;
	use Wikibase\Repo\ParserOutput\StatementDataUpdater;

	/**
	* Add required styles for mathematical formulae to the ParserOutput.
	*
	* @license GPL-2.0-or-later
	* @author Moritz Schubotz
	*/
	class MathDataUpdater implements StatementDataUpdater {

	/** @var bool */
	private $hasMath = false;

	/**
	* @var PropertyDataTypeMatcher
	*/
	private $propertyDataTypeMatcher;

	/**
	* @inheritDoc
	*/
	public function __construct( PropertyDataTypeMatcher $propertyDataTypeMatcher ) {
	$this->propertyDataTypeMatcher = $propertyDataTypeMatcher;
	}

	/**
	* Extract some data or do processing on a Statement during parsing.
	*
	* This method is normally invoked when processing a StatementList
	* for all Statements on a StatementListProvider (e.g. an Item).
	*
	* @param Statement $statement
	*/
	public function processStatement( Statement $statement ) {
	$propertyId = $statement->getPropertyId();
	if ( $this->propertyDataTypeMatcher->isMatchingDataType( $propertyId, 'math' ) ) {
	$this->hasMath = true;
	}
	}

	/**
	* Update extension data, properties or other data in ParserOutput.
	* These updates are invoked when EntityContent::getParserOutput is called.
	*
	* @param ParserOutput $parserOutput
	*/
	public function updateParserOutput( ParserOutput $parserOutput ) {
	if ( $this->hasMath ) {
	$parserOutput->addModuleStyles( [ 'ext.math.styles' ] );
	}
	}
	}