CustomPropertyMatcher.php
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CustomPropertyMatcher.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 custom property (a CSS variable) example --name-of-variable
	*
	* This utilises regex to match the custom property --[a-zA-Z][a-zA-Z0-9-] without any input validation.
	*
	* @see https://www.w3.org/TR/2022/CR-css-variables-1-20220616/#custom-property
	*/
	class CustomPropertyMatcher extends Matcher {

	/** @inheritDoc */
	protected function generateMatches( ComponentValueList $values, $start, array $options ) {
	$cv = $values[$start] ?? null;
	if ( $cv instanceof Token && $cv->type() === Token::T_IDENT
	&& preg_match( '/^\-\-[a-zA-Z][a-zA-Z0-9-]*$/', $cv->value() ) ) {
	yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) );
	}
	}
	}