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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection;
use Closure;
use Ramsey\Collection\Exception\CollectionMismatchException;
use Ramsey\Collection\Exception\InvalidArgumentException;
use Ramsey\Collection\Exception\InvalidPropertyOrMethod;
use Ramsey\Collection\Exception\NoSuchElementException;
use Ramsey\Collection\Exception\UnsupportedOperationException;
use Ramsey\Collection\Tool\TypeTrait;
use Ramsey\Collection\Tool\ValueExtractorTrait;
use Ramsey\Collection\Tool\ValueToStringTrait;
use function array_filter;
use function array_key_first;
use function array_key_last;
use function array_map;
use function array_merge;
use function array_reduce;
use function array_search;
use function array_udiff;
use function array_uintersect;
use function in_array;
use function is_int;
use function is_object;
use function spl_object_id;
use function sprintf;
use function usort;
/**
* This class provides a basic implementation of `CollectionInterface`, to
* minimize the effort required to implement this interface
*
* @template T
* @extends AbstractArray<T>
* @implements CollectionInterface<T>
*/
abstract class AbstractCollection extends AbstractArray implements CollectionInterface
{
use TypeTrait;
use ValueToStringTrait;
use ValueExtractorTrait;
/**
* @throws InvalidArgumentException if $element is of the wrong type.
*/
public function add(mixed $element): bool
{
$this[] = $element;
return true;
}
public function contains(mixed $element, bool $strict = true): bool
{
return in_array($element, $this->data, $strict);
}
/**
* @throws InvalidArgumentException if $element is of the wrong type.
*/
public function offsetSet(mixed $offset, mixed $value): void
{
if ($this->checkType($this->getType(), $value) === false) {
throw new InvalidArgumentException(
'Value must be of type ' . $this->getType() . '; value is '
. $this->toolValueToString($value),
);
}
if ($offset === null) {
$this->data[] = $value;
} else {
$this->data[$offset] = $value;
}
}
public function remove(mixed $element): bool
{
if (($position = array_search($element, $this->data, true)) !== false) {
unset($this[$position]);
return true;
}
return false;
}
/**
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call column() on this
* collection.
*
* @inheritDoc
*/
public function column(string $propertyOrMethod): array
{
$temp = [];
foreach ($this->data as $item) {
$temp[] = $this->extractValue($item, $propertyOrMethod);
}
return $temp;
}
/**
* @return T
*
* @throws NoSuchElementException if this collection is empty.
*/
public function first(): mixed
{
$firstIndex = array_key_first($this->data);
if ($firstIndex === null) {
throw new NoSuchElementException('Can\'t determine first item. Collection is empty');
}
return $this->data[$firstIndex];
}
/**
* @return T
*
* @throws NoSuchElementException if this collection is empty.
*/
public function last(): mixed
{
$lastIndex = array_key_last($this->data);
if ($lastIndex === null) {
throw new NoSuchElementException('Can\'t determine last item. Collection is empty');
}
return $this->data[$lastIndex];
}
/**
* @return CollectionInterface<T>
*
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call sort() on this
* collection.
*/
public function sort(?string $propertyOrMethod = null, Sort $order = Sort::Ascending): CollectionInterface
{
$collection = clone $this;
usort(
$collection->data,
function (mixed $a, mixed $b) use ($propertyOrMethod, $order): int {
$aValue = $this->extractValue($a, $propertyOrMethod);
$bValue = $this->extractValue($b, $propertyOrMethod);
return ($aValue <=> $bValue) * ($order === Sort::Descending ? -1 : 1);
},
);
return $collection;
}
/**
* @param callable(T): bool $callback A callable to use for filtering elements.
*
* @return CollectionInterface<T>
*/
public function filter(callable $callback): CollectionInterface
{
$collection = clone $this;
$collection->data = array_merge([], array_filter($collection->data, $callback));
return $collection;
}
/**
* @return CollectionInterface<T>
*
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call where() on this
* collection.
*/
public function where(?string $propertyOrMethod, mixed $value): CollectionInterface
{
return $this->filter(
fn (mixed $item): bool => $this->extractValue($item, $propertyOrMethod) === $value,
);
}
/**
* @param callable(T): TCallbackReturn $callback A callable to apply to each
* item of the collection.
*
* @return CollectionInterface<TCallbackReturn>
*
* @template TCallbackReturn
*/
public function map(callable $callback): CollectionInterface
{
return new Collection('mixed', array_map($callback, $this->data));
}
/**
* @param callable(TCarry, T): TCarry $callback A callable to apply to each
* item of the collection to reduce it to a single value.
* @param TCarry $initial This is the initial value provided to the callback.
*
* @return TCarry
*
* @template TCarry
*/
public function reduce(callable $callback, mixed $initial): mixed
{
return array_reduce($this->data, $callback, $initial);
}
/**
* @param CollectionInterface<T> $other The collection to check for divergent
* items.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if the compared collections are of
* differing types.
*/
public function diff(CollectionInterface $other): CollectionInterface
{
$this->compareCollectionTypes($other);
$diffAtoB = array_udiff($this->data, $other->toArray(), $this->getComparator());
$diffBtoA = array_udiff($other->toArray(), $this->data, $this->getComparator());
$collection = clone $this;
$collection->data = array_merge($diffAtoB, $diffBtoA);
return $collection;
}
/**
* @param CollectionInterface<T> $other The collection to check for
* intersecting items.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if the compared collections are of
* differing types.
*/
public function intersect(CollectionInterface $other): CollectionInterface
{
$this->compareCollectionTypes($other);
$collection = clone $this;
$collection->data = array_uintersect($this->data, $other->toArray(), $this->getComparator());
return $collection;
}
/**
* @param CollectionInterface<T> ...$collections The collections to merge.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if unable to merge any of the given
* collections or items within the given collections due to type
* mismatch errors.
*/
public function merge(CollectionInterface ...$collections): CollectionInterface
{
$mergedCollection = clone $this;
foreach ($collections as $index => $collection) {
if (!$collection instanceof static) {
throw new CollectionMismatchException(
sprintf('Collection with index %d must be of type %s', $index, static::class),
);
}
// When using generics (Collection.php, Set.php, etc),
// we also need to make sure that the internal types match each other
if ($this->getUniformType($collection) !== $this->getUniformType($this)) {
throw new CollectionMismatchException(
sprintf(
'Collection items in collection with index %d must be of type %s',
$index,
$this->getType(),
),
);
}
foreach ($collection as $key => $value) {
if (is_int($key)) {
$mergedCollection[] = $value;
} else {
$mergedCollection[$key] = $value;
}
}
}
return $mergedCollection;
}
/**
* @param CollectionInterface<T> $other
*
* @throws CollectionMismatchException
*/
private function compareCollectionTypes(CollectionInterface $other): void
{
if (!$other instanceof static) {
throw new CollectionMismatchException('Collection must be of type ' . static::class);
}
// When using generics (Collection.php, Set.php, etc),
// we also need to make sure that the internal types match each other
if ($this->getUniformType($other) !== $this->getUniformType($this)) {
throw new CollectionMismatchException('Collection items must be of type ' . $this->getType());
}
}
private function getComparator(): Closure
{
return function (mixed $a, mixed $b): int {
// If the two values are object, we convert them to unique scalars.
// If the collection contains mixed values (unlikely) where some are objects
// and some are not, we leave them as they are.
// The comparator should still work and the result of $a < $b should
// be consistent but unpredictable since not documented.
if (is_object($a) && is_object($b)) {
$a = spl_object_id($a);
$b = spl_object_id($b);
}
return $a === $b ? 0 : ($a < $b ? 1 : -1);
};
}
/**
* @param CollectionInterface<mixed> $collection
*/
private function getUniformType(CollectionInterface $collection): string
{
return match ($collection->getType()) {
'integer' => 'int',
'boolean' => 'bool',
'double' => 'float',
default => $collection->getType(),
};
}
}