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<?php |
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declare(strict_types=1); |
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/** |
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* This file is part of the Set package. |
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* For the full copyright information please view the LICENCE file that was |
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* distributed with this package. |
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* |
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* @copyright Simon Deeley 2017 |
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*/ |
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namespace simondeeley; |
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use InvalidArgumentException; |
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use SplFixedArray; |
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use simondeeley\Type\Type; |
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use simondeeley\Type\SetType; |
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use simondeeley\Type\TypeEquality; |
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use simondeeley\ImmutableArrayTypeObject; |
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use simondeeley\Helpers\TypeEqualityHelperMethods; |
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/** |
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* Set type object |
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* |
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* Implements a mathematical set in PHP. A mathematical set is an unordered list |
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* of items where two lists are considered equal if both sets contain the same |
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* items but not necessarily in the same order or in the same quantity. So, for |
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* example: |
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* Set(1, 2, 3) === Set(3, 1, 2); |
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* Set(1, 2, 3) === Set(1, 2, 2, 3); |
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* but |
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* Set(1, 2) !== Set(1, 2, 3); |
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* |
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* @author Simon Deeley <[email protected]> |
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*/ |
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abstract class Set extends ImmutableArrayTypeObject implements SetType, TypeEquality |
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{ |
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use TypeEqualityHelperMethods; |
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/** |
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* @var SplFixedArray |
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*/ |
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protected $data; |
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/** |
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* Construct a new Set |
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* |
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* @final |
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* @param mixed ...$items - accepts any number of items |
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* @return void |
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*/ |
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final public function __construct(...$items) |
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{ |
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$this->data = SplFixedArray::fromArray($items); |
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} |
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/** |
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* Compare equality of two Sets |
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* |
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* @final |
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* @param Type $set - The set to compare with |
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* @param int $flags - Optional flags |
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* @return bool |
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* @throws InvalidArgumentException - thrown if $type is not of an instance |
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* of {@link Set} |
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*/ |
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final public function equals(Type $set, int $flags = TypeEquality::IGNORE_OBJECT_IDENTITY): bool |
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{ |
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if (false === $set instanceof SetType) { |
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throw new InvalidArgumentException(sprintf( |
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'Cannot compare %s with %s as they are not of the same type', |
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get_class($this), |
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get_class($tuple) |
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)); |
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} |
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return $this->isInArray($this->data->toArray(), $set->data->toArray()) |
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&& $this->isInArray($set->data->toArray(), $this->data->toArray()) |
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&& $this->isSameTypeAs($set, $flags) |
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&& $this->isSameObjectAs($set, $flags); |
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} |
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/** |
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* Helper function for evaluate differences between two arrays |
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* |
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* @param array $first |
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* @param array $second |
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* @return bool |
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*/ |
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final private function isInArray(array $first, array $second): bool |
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{ |
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foreach ($first as $item) { |
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if (false === in_array($item, $second, true)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Return the type of the object |
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* |
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* @return string |
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*/ |
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public static function getType(): string |
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{ |
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return 'SET'; |
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} |
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} |
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simondeeley /
set
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