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<?php namespace Mbh\Collection\Traits; |
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/** |
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* MBHFramework |
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* |
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* @link https://github.com/MBHFramework/mbh-framework |
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* @copyright Copyright (c) 2017 Ulises Jeremias Cornejo Fandos |
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* @license https://github.com/MBHFramework/mbh-framework/blob/master/LICENSE (MIT License) |
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*/ |
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use Mbh\Collection\FixedArray; |
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use Mbh\Collection\Interfaces\Sequenceable as SequenceableInterface; |
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use Traversable; |
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use SplFixedArray; |
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use SplStack; |
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use LimitIterator; |
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trait Sort |
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{ |
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/** |
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* Perform a bottom-up, non-recursive, in-place mergesort. |
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* Efficient for very-large objects, and written without recursion |
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* since PHP isn't well optimized for large recursion stacks. |
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* |
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* @param callable $callback The callback for comparison |
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* @return SequenceableInterface |
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*/ |
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public function mergeSort(callable $callback): SequenceableInterface |
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{ |
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$count = count($this); |
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$result = new SplFixedArray($count); |
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for ($k = 1; $k < $count; $k = $k << 1) { |
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for ($left = 0; ($left + $k) < $count; $left += $k << 1) { |
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$right = $left + $k; |
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$rend = min($right + $k, $count); |
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$m = $left; |
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$i = $left; |
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$j = $right; |
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while ($i < $right && $j < $rend) { |
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if ($callback($this[$i], $this[$j]) <= 0) { |
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$result[$m] = $this[$i]; |
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$i++; |
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} else { |
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$result[$m] = $this[$j]; |
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$j++; |
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} |
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$m++; |
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} |
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while ($i < $right) { |
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$result[$m] = $this[$i]; |
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$i++; |
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$m++; |
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} |
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while ($j < $rend) { |
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$result[$m] = $this[$j]; |
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$j++; |
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$m++; |
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} |
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for ($m = $left; $m < $rend; $m++) { |
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$this[$m] = $result[$m]; |
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} |
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} |
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} |
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return $this; |
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} |
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/** |
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* Sort by applying a CallbackHeap and building a new heap |
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* Can be efficient for sorting large stored objects. |
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* |
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* @param callable $callback The comparison callback |
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* @return SequenceableInterface |
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*/ |
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public function heapSort(callable $callback): SequenceableInterface |
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{ |
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$this->setTraversable($this->heapSortedWithCallback($callback)); |
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return $this; |
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} |
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/** |
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* Sort by applying a CallbackHeap and building a new heap |
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* Can be efficient for sorting large stored objects. |
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* |
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* @param callable $callback The comparison callback |
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* @return SequenceableInterface |
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*/ |
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public function heapSorted(callable $callback): SequenceableInterface |
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{ |
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$h = new CallbackHeap($callback); |
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foreach ($this as $elem) { |
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$h->insert($elem); |
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} |
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return static::fromItems($h); |
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} |
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/** |
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* Fallback behaviour to use the builtin array sort functions |
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* |
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* @param callable $callback The callback for comparison |
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* @return SequenceableInterface |
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*/ |
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public function arraySort(callable $callback = null): SequenceableInterface |
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{ |
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$array = $this->toArray(); |
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if ($callback) { |
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usort($array, $callback); |
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} else { |
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sort($array); |
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} |
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$this->setTraversable(static::fromArray($array)); |
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return $this; |
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} |
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abstract protected function setTraversable(Traversable $traversable); |
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} |
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MBHFramework /
structures
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