CheckedMatcher.php
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CheckedMatcher.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;

	/**
	* Wrap another matcher in a callback to verify the matches
	*/
	class CheckedMatcher extends Matcher {
	/** @var Matcher */
	private $matcher;

	/** @var callable */
	protected $check;

	/**
	* @param Matcher $matcher Base matcher
	* @param callable $check Function to check the match is really valid.
	* Prototype is bool func( ComponentValueList $values, GrammarMatch $match, array $options )
	*/
	public function __construct( Matcher $matcher, callable $check ) {
	$this->matcher = $matcher;
	$this->check = $check;
	}

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