cfnpp/app/Cfnpp/Expression/TokenNumericLiteral.php

<?php

declare(strict_types=1);

namespace App\Cfnpp\Expression;

/**
 * Token representing a numeric (integer or float) literal.
 *
 * @author Adam Pippin <hello@adampippin.ca>
 */
class TokenNumericLiteral extends Token
{
	/**
	 * Numeric value this token represents.
	 * @var int|float
	 */
	protected $value;

	/**
	 * Create a new numeric literal.
	 *
	 * @param int|float $value
	 */
	public function __construct($value)
	{
		$this->value = $value;
	}

	/**
	 * Get the value this token represents.
	 *
	 * @return int|float
	 */
	public function getValue()
	{
		return $this->value;
	}

	/**
	 * Determine whether a numeric token can be parsed from a stream.
	 *
	 * @param  string $stream
	 * @return bool
	 */
	public static function isToken(string $stream): bool
	{
		return is_numeric($stream[0]);
	}

	/**
	 * Parse a numeric token from a stream.
	 *
	 * Returns token, and modifies stream to remove all consumed characters.
	 *
	 * @param  string $stream
	 * @return Token
	 */
	public static function getToken(string &$stream): Token
	{
		$buffer = '';
		for ($i = 0; $i < strlen($stream); $i++)
		{
			if (preg_match('/^[0-9]$/', $stream[$i]))
			{
				$buffer .= $stream[$i];
			}
			else
			{
				break;
			}
		}

		$stream = substr($stream, strlen($buffer));

		if (stristr($buffer, '.'))
		{
			$buffer = (float)$buffer;
		}
		else
		{
			$buffer = (int)$buffer;
		}

		return new TokenNumericLiteral($buffer);
	}
}