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<?php |
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namespace DusanKasan\Knapsack; |
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use DusanKasan\Knapsack\Exceptions\InvalidArgument; |
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use DusanKasan\Knapsack\Exceptions\InvalidReturnValue; |
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use IteratorAggregate; |
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use RecursiveArrayIterator; |
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use Traversable; |
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class Collection implements IteratorAggregate, \Serializable |
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{ |
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use CollectionTrait; |
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/** |
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* @var Traversable |
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*/ |
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protected $input; |
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/** |
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* @var callable |
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*/ |
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private $inputFactory; |
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/** |
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* @param callable|array|Traversable $input If callable is passed, it must return an array|Traversable. |
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*/ |
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public function __construct($input) |
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{ |
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if (is_callable($input)) { |
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$this->inputFactory = $input; |
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$input = $input(); |
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} |
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if (is_array($input)) { |
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$this->input = new RecursiveArrayIterator($input); |
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} elseif ($input instanceof Traversable) { |
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$this->input = $input; |
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} else { |
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throw $this->inputFactory ? new InvalidReturnValue : new InvalidArgument; |
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} |
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} |
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/** |
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* Static alias of normal constructor. |
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* |
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* @param callable|array|Traversable $input |
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* @return Collection |
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*/ |
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public static function from($input) |
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{ |
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return new self($input); |
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} |
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/** |
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* Returns lazy collection of values, where first value is $input and all subsequent values are computed by applying |
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* $function to the last value in the collection. By default this produces an infinite collection. However you can |
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* end the collection by throwing a NoMoreItems exception. |
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* |
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* @param mixed $input |
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* @param callable $function |
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* @return Collection |
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*/ |
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public static function iterate($input, callable $function) |
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{ |
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return iterate($input, $function); |
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} |
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/** |
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* Returns a lazy collection of $value repeated $times times. If $times is not provided the collection is infinite. |
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* |
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* @param mixed $value |
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* @param int $times |
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* @return Collection |
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*/ |
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public static function repeat($value, $times = -1) |
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{ |
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return repeat($value, $times); |
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} |
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/** |
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* Returns a lazy collection of numbers starting at $start, incremented by $step until $end is reached. |
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* |
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* @param int $start |
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* @param int|null $end |
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* @param int $step |
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* @return Collection |
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*/ |
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public static function range($start = 0, $end = null, $step = 1) |
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{ |
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return \DusanKasan\Knapsack\range($start, $end, $step); |
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} |
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/** |
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* {@inheritdoc} |
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* @throws InvalidReturnValue |
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*/ |
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public function getIterator() |
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{ |
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if ($this->inputFactory) { |
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$input = call_user_func($this->inputFactory); |
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if (is_array($input)) { |
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$input = new RecursiveArrayIterator($input); |
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} |
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if (!($input instanceof Traversable)) { |
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throw new InvalidReturnValue; |
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} |
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$this->input = $input; |
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} |
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return $this->input; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function serialize() |
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{ |
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return serialize( |
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toArray( |
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map( |
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$this->input, |
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function ($value, $key) { |
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return [$key, $value]; |
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} |
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) |
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) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function unserialize($serialized) |
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{ |
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$this->input = dereferenceKeyValue(unserialize($serialized)); |
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} |
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} |
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DusanKasan /
Knapsack
