TokenMatcher.php
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TokenMatcher.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\Objects\Token;

	/**
	* Matcher that matches a token of a particular type
	* @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#component-types
	*/
	class TokenMatcher extends Matcher {
	/** @var string One of the Token::T_* constants */
	protected $type;

	/** @var callable\|null Something to call to further validate the token */
	protected $callback = null;

	/**
	* @param string $type Token type to match
	* @param callable\|null $callback Something to call to further validate the token.
	* bool callback( Token )
	*/
	public function __construct( $type, ?callable $callback = null ) {
	$this->type = $type;
	$this->callback = $callback;
	}

	/** @inheritDoc */
	protected function generateMatches( ComponentValueList $values, $start, array $options ) {
	$cv = $values[$start] ?? null;
	if ( $cv instanceof Token && $cv->type() === $this->type &&
	( !$this->callback \|\| call_user_func( $this->callback, $cv ) )
	) {
	yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) );
	}
	}
	}