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<?php |
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declare(strict_types=1); |
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namespace Ivory\Value\Alg; |
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use Ivory\Exception\IncomparableException; |
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class ComparisonUtils |
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{ |
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public static function equals($a, $b): bool |
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{ |
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if ($a === null) { |
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return ($b === null); |
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} |
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if ($a instanceof IEqualable) { |
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return $a->equals($b); |
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} elseif (is_array($a)) { |
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if (!is_array($b)) { |
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return false; |
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} |
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if (count($a) != count($b)) { |
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return false; |
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} |
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foreach ($a as $k => $v) { |
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if (!array_key_exists($k, $b)) { |
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return false; |
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} |
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if (!self::equals($v, $b[$k])) { |
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return false; |
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} |
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} |
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return true; |
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} else { |
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return ($a == $b); |
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} |
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} |
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/** |
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* Compares two values according to their type. |
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* |
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* @param mixed $a |
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* @param mixed $b |
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* @return int the comparison result: negative integer, zero, or positive integer if <tt>$this</tt> is less than, |
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* equal to, or greater than <tt>$other</tt>, respectively |
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* @throws IncomparableException if the values are incomparable |
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* @throws \InvalidArgumentException if either of values is <tt>null</tt> |
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*/ |
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public static function compareValues($a, $b): int |
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{ |
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if ($a === null || $b === null) { |
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throw new \InvalidArgumentException('comparing with null'); |
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} |
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if (is_int($a) || is_bool($a)) { |
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return ($a <=> $b); |
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} elseif (is_float($a)) { |
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return self::compareFloats($a, $b); |
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} elseif (is_string($a)) { |
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return strcmp($a, $b); |
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} elseif ($a instanceof IComparable) { |
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return $a->compareTo($b); |
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} elseif (is_array($a) && is_array($b)) { |
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return self::compareArrays($a, $b); |
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} else { |
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throw new IncomparableException(); |
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} |
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} |
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public static function compareBigIntegers($a, $b): int |
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{ |
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if ($a > PHP_INT_MAX || $b > PHP_INT_MAX || $a < PHP_INT_MIN || $b < PHP_INT_MIN) { |
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return bccomp($a, $b, 0); |
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} else { |
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return (int)$a - (int)$b; |
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} |
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} |
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public static function compareFloats($a, $b): int |
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{ |
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if ($a === NAN) { |
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return ($b === NAN ? 0 : 1); |
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} elseif ($b === NAN) { |
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return -1; |
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} |
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return (float)$a <=> (float)$b; |
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} |
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public static function compareArrays(array $a, array $b): int |
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{ |
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reset($b); |
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foreach ($a as $av) { |
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if (key($b) === null) { |
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return 1; |
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} |
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$bv = current($b); |
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next($b); |
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if ($av === null) { |
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if ($bv !== null) { |
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return -1; |
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} |
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} elseif ($bv === null) { |
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return 1; |
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} elseif (is_array($av)) { |
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if (is_array($bv)) { |
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$comp = self::compareArrays($av, $bv); |
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if ($comp) { |
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return $comp; |
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} |
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} else { |
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return 1; |
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} |
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} elseif (is_array($bv)) { |
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return -1; |
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} else { |
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$comp = self::compareValues($av, $bv); |
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if ($comp != 0) { |
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return $comp; |
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} |
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} |
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} |
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if (key($b) !== null) { |
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return -1; |
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} |
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// ties broken by the subscripts of the first item |
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$aFst = $a; |
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$bFst = $b; |
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do { |
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reset($aFst); |
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reset($bFst); |
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$ak = key($aFst); |
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$bk = key($bFst); |
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if ($ak === null && $bk === null) { |
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return 0; |
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} elseif ($ak === null) { |
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return -1; |
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} elseif ($bk === null) { |
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return 1; |
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} elseif (!is_numeric($ak) || !is_numeric($bk)) { |
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return 0; |
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} else { |
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$d = $ak - $bk; |
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if ($d) { |
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return $d; |
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} else { |
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$aFst = current($aFst); |
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$bFst = current($bFst); |
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} |
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} |
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} while (is_array($aFst) && is_array($bFst)); |
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return 0; |
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} |
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} |
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|
ondrej-bouda /
ivory
