Alternative.php
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Alternative.php
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	<?php
	/**
	* @file
	* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
	*/

	namespace Wikimedia\CSS\Grammar;

	use Wikimedia\CSS\Objects\ComponentValueList;
	use Wikimedia\CSS\Util;

	/**
	* Matcher that matches one out of a set of Matchers ("\|" combiner).
	* @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#comb-one
	*/
	class Alternative extends Matcher {
	/** @var Matcher[] */
	protected $matchers;

	/**
	* @param Matcher[] $matchers
	*/
	public function __construct( array $matchers ) {
	Util::assertAllInstanceOf( $matchers, Matcher::class, '$matchers' );
	$this->matchers = $matchers;
	}

	/** @inheritDoc */
	protected function generateMatches( ComponentValueList $values, $start, array $options ) {
	$used = [];
	foreach ( $this->matchers as $matcher ) {
	foreach ( $matcher->generateMatches( $values, $start, $options ) as $match ) {
	$newMatch = $this->makeMatch( $values, $start, $match->getNext(), $match );
	$mid = $newMatch->getUniqueID();
	if ( !isset( $used[$mid] ) ) {
	$used[$mid] = 1;
	yield $newMatch;
	}
	}
	}
	}
	}