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<?php |
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namespace Ds; |
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use Error; |
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use UnderflowException; |
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/** |
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* Stack |
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* |
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* @package Ds |
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*/ |
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final class Stack implements \IteratorAggregate, \ArrayAccess, Collection |
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{ |
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use Traits\Collection; |
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/** |
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* @var Vector |
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*/ |
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private $internal; |
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/** |
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* Creates an instance using the values of an array or Traversable object. |
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* |
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* @param array|\Traversable $values |
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*/ |
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public function __construct($values = null) |
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{ |
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$this->internal = new Vector($values ?: []); |
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} |
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/** |
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* Clear all elements in the Stack |
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*/ |
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public function clear() |
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{ |
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$this->internal->clear(); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function copy(): Collection |
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{ |
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return new self($this->internal); |
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} |
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/** |
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* Returns the number of elements in the Stack |
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* |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return count($this->internal); |
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} |
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/** |
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* Ensures that enough memory is allocated for a specified capacity. This |
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* potentially reduces the number of reallocations as the size increases. |
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* |
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* @param int $capacity The number of values for which capacity should be |
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* allocated. Capacity will stay the same if this value |
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* is less than or equal to the current capacity. |
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*/ |
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public function allocate(int $capacity) |
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{ |
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$this->internal->allocate($capacity); |
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} |
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/** |
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* Returns the current capacity of the stack. |
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* |
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* @return int |
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*/ |
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public function capacity(): int |
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{ |
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return $this->internal->capacity(); |
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} |
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/** |
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* Returns the value at the top of the stack without removing it. |
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* |
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* @return mixed |
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* |
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* @throws UnderflowException if the stack is empty. |
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*/ |
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public function peek() |
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{ |
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return $this->internal->last(); |
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} |
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/** |
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* Returns and removes the value at the top of the stack |
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* |
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* @return mixed |
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* |
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* @throws UnderflowException if the stack is empty. |
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*/ |
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public function pop() |
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{ |
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return $this->internal->pop(); |
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} |
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/** |
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* Pushes zero or more values onto the top of the stack. |
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* |
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* @param mixed ...$values |
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*/ |
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public function push(...$values) |
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{ |
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$this->internal->push(...$values); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function toArray(): array |
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{ |
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return array_reverse($this->internal->toArray()); |
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} |
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/** |
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* Get iterator |
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*/ |
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public function getIterator() |
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{ |
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while ($this->isEmpty() === false) { |
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yield $this->pop(); |
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} |
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} |
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/** |
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* @inheritdoc |
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* |
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* @throws Error |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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if ($offset === null) { |
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$this->push($value); |
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} else { |
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throw new Error(); |
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} |
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} |
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/** |
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147
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* @inheritdoc |
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* |
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* @throws Error |
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*/ |
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public function offsetGet($offset) |
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{ |
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throw new Error(); |
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} |
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/** |
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157
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* @inheritdoc |
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158
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* |
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159
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* @throws Error |
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160
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*/ |
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public function offsetUnset($offset) |
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{ |
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throw new Error(); |
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} |
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/** |
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167
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* @inheritdoc |
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168
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* |
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169
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* @throws Error |
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*/ |
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public function offsetExists($offset) |
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{ |
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throw new Error(); |
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} |
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175
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} |
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This check looks for
@paramannotations where the type inferred by our type inference engine differs from the declared type.It makes a suggestion as to what type it considers more descriptive. In addition it looks for parameters that have the generic type
arrayand suggests a stricter type likearray<String>.Most often this is a case of a parameter that can be null in addition to its declared types.