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<?php
/**
* @package FOF
* @copyright Copyright (c)2010-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
namespace FOF40\Utils;
defined('_JEXEC') || die;
use ArrayAccess;
use ArrayIterator;
use CachingIterator;
use Closure;
use Countable;
use IteratorAggregate;
use JsonSerializable;
class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSerializable
{
/**
* The items contained in the collection.
*
* @var array
*/
protected $items = [];
/**
* Create a new collection.
*
* @param array $items
*/
public function __construct(array $items = [])
{
$this->items = $items;
}
/**
* Create a new collection instance if the value isn't one already. If given an array then the array is wrapped in
* a Collection. Otherwise we return a Collection with only one item, whatever was passed in $items. If you pass
* null you get an empty Collection.
*
* @param array|mixed $items
*
* @return static
*/
public static function make($items): Collection
{
if (is_null($items))
{
return new static;
}
if ($items instanceof Collection)
{
return $items;
}
return new static(is_array($items) ? $items : [$items]);
}
/**
* Get all of the items in the collection.
*
* @return array
*/
public function all(): array
{
return $this->items;
}
/**
* Collapse the collection items into a single array. This assumes that the Collection is composed of arrays. We
* are essentially merging all of these arrays and creating a new Collection out of them.
*
* If $this->items = [ ['a','b'], ['c','d'], ['e'] ] after collapse it becomes [ 'a','b','c','d','e' ]
*
* @return Collection
*/
public function collapse(): Collection
{
$results = [];
foreach ($this->items as $values)
{
$results = array_merge($results, $values);
}
return new static($results);
}
/**
* Diff the collection with the given items.
*
* @param Collection|array $items
*
* @return Collection
*/
public function diff($items): Collection
{
return new static(array_diff($this->items, $this->getIterableItemsAsArray($items)));
}
/**
* Execute a callback over each item.
*
* @param Closure $callback
*
* @return Collection
*/
public function each(Closure $callback): Collection
{
array_map($callback, $this->items);
return $this;
}
/**
* Fetch a nested element of the collection.
*
* @param string $key
*
* @return Collection
*/
public function fetch(string $key): Collection
{
return new static(array_fetch($this->items, $key));
}
/**
* Run a filter over each of the items.
*
* @param Closure $callback
*
* @return Collection
*/
public function filter(Closure $callback): Collection
{
return new static(array_filter($this->items, $callback));
}
/**
* Get the first item from the collection.
*
* @param \Closure $callback
* @param mixed $default
*
* @return mixed|null
*/
public function first(Closure $callback = null, $default = null)
{
if (is_null($callback))
{
return count($this->items) > 0 ? reset($this->items) : null;
}
else
{
return array_first($this->items, $callback, $default);
}
}
/**
* Get a flattened array of the items in the collection.
*
* @return Collection
*/
public function flatten(): Collection
{
return new static(array_flatten($this->items));
}
/**
* Remove an item from the collection by key.
*
* @param mixed $key
*
* @return void
*/
public function forget(string $key): void
{
unset($this->items[$key]);
}
/**
* Get an item from the collection by key.
*
* @param mixed $key
* @param mixed $default
*
* @return mixed
*/
public function get(string $key, $default = null)
{
if (array_key_exists($key, $this->items))
{
return $this->items[$key];
}
return value($default);
}
/**
* Group an associative array by a field or Closure value.
*
* @param callable|string $groupBy
*
* @return Collection
*/
public function groupBy($groupBy): Collection
{
$results = [];
foreach ($this->items as $key => $value)
{
$key = is_callable($groupBy) ? $groupBy($value, $key) : array_get($value, $groupBy);
$results[$key][] = $value;
}
return new static($results);
}
/**
* Determine if an item exists in the collection by key.
*
* @param string $key
*
* @return bool
*/
public function has(string $key): bool
{
return array_key_exists($key, $this->items);
}
/**
* Concatenate values of a given key as a string.
*
* @param string $value
* @param string|null $glue
*
* @return string
*/
public function implode(string $value, ?string $glue = null): string
{
if (is_null($glue))
{
return implode($this->lists($value));
}
return implode($glue, $this->lists($value));
}
/**
* Intersect the collection with the given items.
*
* @param Collection|array $items
*
* @return Collection
*/
public function intersect($items): Collection
{
return new static(array_intersect($this->items, $this->getIterableItemsAsArray($items)));
}
/**
* Determine if the collection is empty or not.
*
* @return bool
*/
public function isEmpty(): bool
{
return empty($this->items);
}
/**
* Get the last item from the collection.
*
* @return mixed|null
*/
public function last()
{
return count($this->items) > 0 ? end($this->items) : null;
}
/**
* Get an array with the values of a given key.
*
* @param string $value
* @param string|null $key
*
* @return array
*/
public function lists(string $value, ?string $key = null)
{
return array_pluck($this->items, $value, $key);
}
/**
* Run a map over each of the items.
*
* @param Closure $callback
*
* @return Collection
*/
public function map(Closure $callback): Collection
{
return new static(array_map($callback, $this->items, array_keys($this->items)));
}
/**
* Merge the collection with the given items.
*
* @param Collection|array $items
*
* @return Collection
*/
public function merge($items): Collection
{
return new static(array_merge($this->items, $this->getIterableItemsAsArray($items)));
}
/**
* Get and remove the last item from the collection.
*
* @return mixed|null
*/
public function pop()
{
return array_pop($this->items);
}
/**
* Push an item onto the beginning of the collection.
*
* @param mixed $value
*
* @return void
*/
public function prepend($value): void
{
array_unshift($this->items, $value);
}
/**
* Push an item onto the end of the collection.
*
* @param mixed $value
*
* @return void
*/
public function push($value): void
{
$this->items[] = $value;
}
/**
* Put an item in the collection by key.
*
* @param string $key
* @param mixed $value
*
* @return void
*/
public function put(string $key, $value): void
{
$this->items[$key] = $value;
}
/**
* Reduce the collection to a single value.
*
* @param callable $callback
* @param mixed $initial
*
* @return mixed
*/
public function reduce(callable $callback, $initial = null)
{
return array_reduce($this->items, $callback, $initial);
}
/**
* Get one or more items randomly from the collection.
*
* @param int $amount
*
* @return mixed
*/
public function random(int $amount = 1)
{
$keys = array_rand($this->items, $amount);
return is_array($keys) ? array_intersect_key($this->items, array_flip($keys)) : $this->items[$keys];
}
/**
* Reverse items order.
*
* @return Collection
*/
public function reverse(): Collection
{
return new static(array_reverse($this->items));
}
/**
* Get and remove the first item from the collection.
*
* @return mixed|null
*/
public function shift()
{
return array_shift($this->items);
}
/**
* Slice the underlying collection array.
*
* @param int $offset
* @param int|null $length
* @param bool $preserveKeys
*
* @return Collection
*/
public function slice(int $offset, ?int $length = null, bool $preserveKeys = false): Collection
{
return new static(array_slice($this->items, $offset, $length, $preserveKeys));
}
/**
* Sort through each item with a callback.
*
* @param Closure $callback
*
* @return Collection
*/
public function sort(Closure $callback): Collection
{
uasort($this->items, $callback);
return $this;
}
/**
* Sort the collection using the given Closure.
*
* @param \Closure|string $callback
* @param int $options
* @param bool $descending
*
* @return Collection
*/
public function sortBy($callback, int $options = SORT_REGULAR, bool $descending = false): Collection
{
$results = [];
if (is_string($callback))
{
$callback =
$this->valueRetriever($callback);
}
// First we will loop through the items and get the comparator from a callback
// function which we were given. Then, we will sort the returned values and
// and grab the corresponding values for the sorted keys from this array.
foreach ($this->items as $key => $value)
{
$results[$key] = $callback($value);
}
$descending ? arsort($results, $options)
: asort($results, $options);
// Once we have sorted all of the keys in the array, we will loop through them
// and grab the corresponding model so we can set the underlying items list
// to the sorted version. Then we'll just return the collection instance.
foreach (array_keys($results) as $key)
{
$results[$key] = $this->items[$key];
}
$this->items = $results;
return $this;
}
/**
* Sort the collection in descending order using the given Closure.
*
* @param \Closure|string $callback
* @param int $options
*
* @return Collection
*/
public function sortByDesc($callback, int $options = SORT_REGULAR): Collection
{
return $this->sortBy($callback, $options, true);
}
/**
* Splice portion of the underlying collection array.
*
* @param int $offset
* @param int $length
* @param mixed $replacement
*
* @return Collection
*/
public function splice(int $offset, int $length = 0, $replacement = []): Collection
{
return new static(array_splice($this->items, $offset, $length, $replacement));
}
/**
* Get the sum of the given values.
*
* @param \Closure|string $callback
*
* @return mixed
*/
public function sum($callback)
{
if (is_string($callback))
{
$callback = $this->valueRetriever($callback);
}
return $this->reduce(function ($result, $item) use ($callback) {
return $result += $callback($item);
}, 0);
}
/**
* Take the first or last {$limit} items.
*
* @param int|null $limit
*
* @return Collection
*/
public function take(?int $limit = null): Collection
{
if ($limit < 0)
{
return $this->slice($limit, abs($limit));
}
return $this->slice(0, $limit);
}
/**
* Resets the Collection (removes all items)
*
* @return Collection
*/
public function reset(): Collection
{
$this->items = [];
return $this;
}
/**
* Transform each item in the collection using a callback.
*
* @param callable $callback
*
* @return Collection
*/
public function transform(callable $callback): Collection
{
$this->items = array_map($callback, $this->items);
return $this;
}
/**
* Return only unique items from the collection array.
*
* @return Collection
*/
public function unique(): Collection
{
return new static(array_unique($this->items));
}
/**
* Reset the keys on the underlying array.
*
* @return Collection
*/
public function values(): Collection
{
$this->items = array_values($this->items);
return $this;
}
/**
* Get the collection of items as a plain array.
*
* @return array
*/
public function toArray(): array
{
return array_map(function ($value) {
return (is_object($value) && method_exists($value, 'toArray')) ? $value->toArray() : $value;
}, $this->items);
}
/**
* Convert the object into something JSON serializable.
*
* @return array
*/
#[\ReturnTypeWillChange]
public function jsonSerialize(): array
{
return $this->toArray();
}
/**
* Get the collection of items as JSON.
*
* @param int $options
*
* @return string
*/
public function toJson(int $options = 0): string
{
return json_encode($this->toArray(), $options);
}
/**
* Get an iterator for the items.
*
* @return ArrayIterator
*/
public function getIterator(): ArrayIterator
{
return new ArrayIterator($this->items);
}
/**
* Get a CachingIterator instance.
*
* @param integer $flags Caching iterator flags
*
* @return \CachingIterator
*/
public function getCachingIterator(int $flags = CachingIterator::CALL_TOSTRING): CachingIterator
{
return new \CachingIterator($this->getIterator(), $flags);
}
/**
* Count the number of items in the collection.
*
* @return int
*/
public function count(): int
{
return count($this->items);
}
/**
* Determine if an item exists at an offset.
*
* @param mixed $key
*
* @return bool
*/
public function offsetExists($key): bool
{
return array_key_exists($key, $this->items);
}
/**
* Get an item at a given offset.
*
* @param mixed $key
*
* @return mixed
*/
#[\ReturnTypeWillChange]
public function offsetGet($key)
{
return $this->items[$key];
}
/**
* Set the item at a given offset.
*
* @param mixed $key
* @param mixed $value
*
* @return void
*/
#[\ReturnTypeWillChange]
public function offsetSet($key, $value)
{
if (is_null($key))
{
$this->items[] = $value;
}
else
{
$this->items[$key] = $value;
}
}
/**
* Unset the item at a given offset.
*
* @param string $key
*
* @return void
*/
#[\ReturnTypeWillChange]
public function offsetUnset($key)
{
unset($this->items[$key]);
}
/**
* Convert the collection to its string representation.
*
* @return string
*/
public function __toString(): string
{
return $this->toJson();
}
/**
* Get a value retrieving callback.
*
* @param string $value
*
* @return \Closure
*/
protected function valueRetriever(string $value): callable
{
return function ($item) use ($value) {
return is_object($item) ? $item->{$value} : array_get($item, $value);
};
}
/**
* Results array of items from Collection.
*
* @param Collection|array $items
*
* @return array
*/
private function getIterableItemsAsArray($items): array
{
if ($items instanceof Collection)
{
$items = $items->all();
}
elseif (is_object($items) && method_exists($items, 'toArray'))
{
$items = $items->toArray();
}
return $items;
}
}