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<?php |
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namespace Ds\Traits; |
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use Error; |
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use OutOfRangeException; |
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use Traversable; |
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use UnderflowException; |
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/** |
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* Sequence |
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* |
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* @package Ds\Traits |
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*/ |
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trait Sequence |
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{ |
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/** |
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* @var array |
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*/ |
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private $internal = []; |
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/** |
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* @inheritDoc |
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*/ |
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public function __construct($values = null) |
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{ |
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if (is_array($values) || $values instanceof Traversable) { |
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$this->push(...$values); |
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} elseif (is_integer($values)) { |
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$this->allocate($values); |
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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 toArray(): array |
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{ |
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return $this->internal; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function merge($values): \Ds\Sequence |
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{ |
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$merged = clone $this; |
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$merged->push(...$values); |
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return $merged; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function count(): int |
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{ |
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return count($this->internal); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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View Code Duplication |
public function contains(...$values): bool |
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{ |
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if ( ! $values) { |
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return false; |
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} |
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foreach ($values as $value) { |
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if ($this->find($value) === false) { |
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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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* @inheritDoc |
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*/ |
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public function filter(callable $callback = null): \Ds\Sequence |
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{ |
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if ($callback) { |
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return new self(array_filter($this->internal, $callback)); |
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} |
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return new self(array_filter($this->internal)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function find($value) |
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{ |
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return array_search($value, $this->internal, true); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function first() |
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{ |
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if (empty($this->internal)) { |
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throw new UnderflowException(); |
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} |
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return $this->internal[0]; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function get(int $index) |
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{ |
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$this->checkRange($index); |
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return $this->internal[$index]; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function insert(int $index, ...$values) |
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{ |
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if ($index < 0 || $index > count($this->internal)) { |
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throw new OutOfRangeException(); |
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} |
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array_splice($this->internal, $index, 0, $values); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function join(string $glue = null): string |
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{ |
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return implode($glue, $this->internal); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function last() |
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{ |
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if ($this->isEmpty()) { |
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throw new UnderflowException(); |
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} |
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return end($this->internal); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function map(callable $callback): \Ds\Sequence |
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{ |
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return new self(array_map($callback, $this->internal)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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View Code Duplication |
public function pop() |
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{ |
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if ($this->isEmpty()) { |
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throw new UnderflowException(); |
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} |
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$value = array_pop($this->internal); |
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$this->adjustCapacity(); |
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return $value; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function push(...$values) |
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{ |
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if ($values) { |
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array_push($this->internal, ...$values); |
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$this->adjustCapacity(); |
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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 reduce(callable $callback, $initial = null) |
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{ |
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return array_reduce($this->internal, $callback, $initial); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function remove(int $index) |
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{ |
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$this->checkRange($index); |
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$value = array_splice($this->internal, $index, 1, null)[0]; |
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$this->adjustCapacity(); |
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return $value; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function reverse(): \Ds\Sequence |
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{ |
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return new self(array_reverse($this->internal)); |
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} |
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private function reverseRange(int $a, int $b) |
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{ |
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$swap = function(&$a, &$b) { |
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$t = $a; |
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$a = $b; |
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$b = $t; |
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}; |
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while (--$b > $a) { |
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$swap($this->internal[$a++], $this->internal[$b--]); |
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} |
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} |
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private function normalizeRotations(int $rotations, int $count) |
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{ |
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if ($rotations < 0) { |
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return $count - (abs($rotations) % $count); |
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} |
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return $rotations % $count; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function rotate(int $rotations) |
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{ |
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if ($this->isEmpty()) { |
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return; |
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} |
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$n = count($this); |
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$r = $this->normalizeRotations($rotations, $n); |
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if ($r > 0) { |
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$this->reverseRange(0, $r); |
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$this->reverseRange($r, $n); |
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$this->reverseRange(0, $n); |
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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 set(int $index, $value) |
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{ |
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$this->checkRange($index); |
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$this->internal[$index] = $value; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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View Code Duplication |
public function shift() |
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{ |
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if ($this->isEmpty()) { |
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throw new UnderflowException(); |
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} |
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$value = array_shift($this->internal); |
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$this->adjustCapacity(); |
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return $value; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function slice(int $offset, int $length = null): \Ds\Sequence |
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{ |
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if (func_num_args() === 1) { |
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return new self(array_slice($this->internal, $offset)); |
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} |
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return new self(array_slice($this->internal, $offset, $length)); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function sort(callable $comparator = null): \Ds\Sequence |
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{ |
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$internal = $this->internal; |
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if ($comparator) { |
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usort($internal, $comparator); |
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} else { |
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sort($internal); |
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} |
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return new self($internal); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function unshift(...$values) |
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{ |
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if ($values) { |
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array_unshift($this->internal, ...$values); |
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$this->adjustCapacity(); |
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} |
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} |
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/** |
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* Check Range |
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* |
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* @param int $index |
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*/ |
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private function checkRange(int $index) |
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{ |
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if ($index < 0 || $index >= count($this->internal)) { |
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throw new OutOfRangeException(); |
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} |
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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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foreach ($this->internal as $value) { |
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yield $value; |
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} |
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} |
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/** |
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* |
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*/ |
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public function clear() |
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{ |
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$this->internal = []; |
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$this->capacity = self::MIN_CAPACITY; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function offsetSet($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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$this->set($offset, $value); |
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} |
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} |
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/** |
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* @inheritdoc |
365
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*/ |
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public function &offsetGet($offset) |
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{ |
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$this->checkRange($offset); |
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return $this->internal[$offset]; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function offsetUnset($offset) |
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{ |
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// Unset should be quiet, so we shouldn't allow 'remove' to throw. |
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if (is_integer($offset) && $offset >= 0 && $offset < count($this)) { |
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$this->remove($offset); |
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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 offsetExists($offset) |
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{ |
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if ($offset < 0 || $offset >= count($this)) { |
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return false; |
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} |
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return $this->get($offset) !== null; |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.