KeywordMatcher.php
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KeywordMatcher.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 one of a set of keywords, case-insensitively
	*
	* This is intended for matching specific <ident-token>s, but will work for
	* other types (case-insensitively) too. For delimiter (or case-sensitive)
	* matching, use DelimMatcher.
	*
	* @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#component-types
	*/
	class KeywordMatcher extends Matcher {
	/** @var string One of the Token::T_* constants */
	protected $type;

	/** @var array Associative array with keys being the values to match */
	protected $values;

	/**
	* @param string\|string[] $values Token values to match
	* @param array $options Options
	* - type: (string) Token type to match. Default is Token::T_IDENT.
	*/
	public function __construct( $values, array $options = [] ) {
	$options += [
	'type' => Token::T_IDENT,
	];

	$this->values = array_flip( array_map( 'strtolower', (array)$values ) );
	$this->type = $options['type'];
	}

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