cfnpp/app/Engine/Cfnpp/Expression/TokenOperator.php

<?php

declare(strict_types=1);

namespace App\Engine\Cfnpp\Expression;

class TokenOperator extends Token
{
	public const OPERATORS = [
		'eq',
		'gt',
		'gte',
		'lt',
		'lte',
		'neq',
		'and',
		'or'
	];

	protected $operator;

	public function __construct($operator)
	{
		$this->operator = $operator;
	}

	public function getOperator()
	{
		return $this->operator;
	}

	public static function isToken(string $stream): bool
	{
		foreach (static::OPERATORS as $operator)
		{
			if (strlen($stream) > strlen($operator) &&
				substr($stream, 0, strlen($operator)) == $operator)
			{
				return true;
			}
		}
		return false;
	}

	public static function getToken(string &$stream): Token
	{
		foreach (static::OPERATORS as $operator)
		{
			if (strlen($stream) > strlen($operator) &&
				substr($stream, 0, strlen($operator)) == $operator)
			{
				$operator = substr($stream, 0, strlen($operator));
				$stream = substr($stream, strlen($operator));
				return new TokenOperator($operator);
			}
		}
	}
}