NonEmpty.php
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NonEmpty.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;

	/**
	* Matcher that requires its sub-Matcher has only non-empty matches ("!" multiplier)
	* @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-req
	*/
	class NonEmpty extends Matcher {
	/** @var Matcher */
	protected $matcher;

	/**
	* @param Matcher $matcher
	*/
	public function __construct( Matcher $matcher ) {
	$this->matcher = $matcher;
	}

	/** @inheritDoc */
	protected function generateMatches( ComponentValueList $values, $start, array $options ) {
	foreach ( $this->matcher->generateMatches( $values, $start, $options ) as $match ) {
	if ( $match->getLength() !== 0 ) {
	yield $this->makeMatch( $values, $start, $match->getNext(), $match );
	}
	}
	}
	}