vendor/phpoffice/phpexcel/unitTests/custom/Complex.php

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<?php

class Complex {

	private $realPart = 0;
	private $imaginaryPart = 0;
	private $suffix = NULL;

	public static function _parseComplex($complexNumber)
	{
		//	Test for real number, with no imaginary part
		if (is_numeric($complexNumber))
			return array( $complexNumber, 0, NULL );

		//	Fix silly human errors
		if (strpos($complexNumber,'+-') !== FALSE)
			$complexNumber = str_replace('+-','-',$complexNumber);
		if (strpos($complexNumber,'++') !== FALSE)
			$complexNumber = str_replace('++','+',$complexNumber);
		if (strpos($complexNumber,'--') !== FALSE)
			$complexNumber = str_replace('--','-',$complexNumber);

		//	Basic validation of string, to parse out real and imaginary parts, and any suffix
		$validComplex = preg_match('/^([\-\+]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?)([\-\+]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?)?(([\-\+]?)([ij]?))$/ui',$complexNumber,$complexParts);

		if (!$validComplex) {
			//	Neither real nor imaginary part, so test to see if we actually have a suffix
			$validComplex = preg_match('/^([\-\+]?)([ij])$/ui',$complexNumber,$complexParts);
			if (!$validComplex) {
				throw new Exception('COMPLEX: Invalid complex number');
			}
			//	We have a suffix, so set the real to 0, the imaginary to either 1 or -1 (as defined by the sign)
			$imaginary = 1;
			if ($complexParts[1] === '-') {
				$imaginary = 0 - $imaginary;
			}
			return array(0, $imaginary, $complexParts[2]);
		}

		//	If we don't have an imaginary part, identify whether it should be +1 or -1...
		if (($complexParts[4] === '') && ($complexParts[9] !== '')) {
			if ($complexParts[7] !== $complexParts[9]) {
				$complexParts[4] = 1;
				if ($complexParts[8] === '-') {
					$complexParts[4] = -1;
				}
			//	... or if we have only the real and no imaginary part (in which case our real should be the imaginary)
			} else {
				$complexParts[4] = $complexParts[1];
				$complexParts[1] = 0;
			}
		}

		//	Return real and imaginary parts and suffix as an array, and set a default suffix if user input lazily
		return array( $complexParts[1],
					  $complexParts[4],
					  !empty($complexParts[9]) ? $complexParts[9] : 'i'
					);
	}	//	function _parseComplex()