<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * @file
 */

declare( strict_types=1 );

namespace MediaWiki\Extension\TemplateStylesExtender\Matcher;

use Wikimedia\CSS\Grammar\Matcher;
use Wikimedia\CSS\Objects\ComponentValueList;

class VarNameMatcher extends Matcher {

	/**
	 * Match css var names in the format of --name-of-var
	 * Pretty hacky...
	 * @inheritDoc
	 */
	protected function generateMatches( ComponentValueList $values, $start, array $options ) {
		$len = count( $values );

		for ( $i = $start; $i < $len; $i++ ) {
			if ( preg_match( '/^\s*--[\w-]+\s*$/', $values[$i]->value() ) === 1 ) {
				yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) );
			}
		}
	}
}