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<?php namespace Mbh\Iterator; |
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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 ArrayAccess; |
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use AppendIterator; |
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use JsonSerializable; |
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use Countable; |
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use Iterator; |
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use RuntimeException; |
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use InvalidArgumentException; |
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/** |
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* Iterator to allow multiple iterators to be concatenated |
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*/ |
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class ConcatIterator extends AppendIterator implements ArrayAccess, Countable, JsonSerializable |
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{ |
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const INVALID_INDEX = 'Index invalid or out of range'; |
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/** @var int $count Fast-lookup count for full set of iterators */ |
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public $count = 0; |
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/** |
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* Build an iterator over multiple iterators |
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* Unlike a LimitIterator, the $end defines the last index, not the count |
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* |
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* @param Iterator $iterator,... Concat iterators in order |
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*/ |
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public function __construct(...$args) |
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{ |
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parent::__construct(); |
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foreach ($args as $i => $iterator) { |
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if ( |
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$iterator instanceof ArrayAccess && |
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$iterator instanceof Countable |
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) { |
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// Unroll other ConcatIterators, so we avoid deep iterator stacks |
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if ($iterator instanceof self) { |
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foreach ($iterator->getArrayIterator() as $innerIt) { |
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$this->append($innerIt); |
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} |
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} else { |
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$this->append($iterator); |
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} |
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$this->count += count($iterator); |
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} else { |
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throw new InvalidArgumentException( |
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'Argument ' . $i . |
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' passed to ' . __METHOD__ . |
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' must be of type ArrayAccess, Countable, and Traversable. ' . |
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gettype($iterator) . ' given.' |
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); |
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} |
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} |
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} |
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/** |
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* Countable |
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*/ |
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public function count(): int |
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{ |
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return $this->count; |
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} |
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/** |
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* ArrayAccess |
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*/ |
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public function offsetExists($offset): boolean |
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{ |
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return $offset >= 0 && $offset < $this->count; |
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} |
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public function offsetGet($offset) |
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{ |
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if ($this->offsetExists($offset)) { |
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list($it, $idx) = $this->getIteratorByIndex($offset); |
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return $it->offsetGet($idx); |
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} else { |
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throw new RuntimeException(self::INVALID_INDEX); |
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} |
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} |
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public function offsetSet($offset, $value) |
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{ |
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list($it, $idx) = $this->getIteratorByIndex($offset); |
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$it->offsetSet($idx, $value); |
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} |
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public function offsetUnset($offset) |
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{ |
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list($it, $idx) = $this->getIteratorByIndex($offset); |
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$it->offsetUnset($idx); |
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} |
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/** |
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* JsonSerializable |
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*/ |
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public function jsonSerialize(): array |
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{ |
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return $this->toArray(); |
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} |
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public function toArray(): array |
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{ |
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return iterator_to_array($this, false); |
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} |
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/** |
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* Find which of the inner iterators an index corresponds to |
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* |
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* @param int $index |
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* @return [ArrayAccess, int] The iterator and interior index |
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*/ |
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protected function getIteratorByIndex($index = 0) |
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{ |
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$runningCount = 0; |
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foreach ($this->getArrayIterator() as $innerIt) { |
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$count = count($innerIt); |
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if ($index < $runningCount + $count) { |
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return [$innerIt, $index - $runningCount]; |
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} |
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$runningCount += $count; |
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} |
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return null; |
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} |
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} |
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MBHFramework /
structures
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