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<?php |
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/** |
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* (c) Steve Nebes <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace SN\RangeDifferencer; |
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/** |
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* A custom iterator to iterate over a List of RangeDifferences. It is used internally by the RangeDifferencer. |
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* |
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* @internal |
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*/ |
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class DifferencesIterator |
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{ |
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/** @var RangeDifference[]|null[] */ |
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private $fRange = []; |
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/** @var int */ |
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private $fIndex = 0; |
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/** @var RangeDifference[] */ |
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private $fArray = []; |
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/** @var RangeDifference|null */ |
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private $fDifference; |
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/** |
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* Default values. |
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* |
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* @param RangeDifference[] $differenceRanges |
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*/ |
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public function __construct(array $differenceRanges) |
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{ |
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$this->fArray = $differenceRanges; |
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$this->fIndex = 0; |
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$this->fRange = []; |
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if ($this->fIndex < \count($this->fArray)) { |
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$this->fDifference = $this->fArray[$this->fIndex++]; |
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} else { |
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$this->fDifference = null; |
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} |
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} |
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/** |
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* @return int |
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*/ |
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public function getCount(): int |
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{ |
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return \count($this->fRange); |
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} |
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/** |
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* @return RangeDifference[] |
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*/ |
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public function getRange(): iterable |
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{ |
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return $this->fRange; |
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} |
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/** |
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* @return int |
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*/ |
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public function getIndex(): int |
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{ |
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return $this->fIndex; |
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} |
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/** |
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* @return RangeDifference|null |
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*/ |
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public function getDifference(): ?RangeDifference |
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{ |
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return $this->fDifference; |
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} |
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/** |
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* Appends the edit to its list and moves to the next RangeDifference. |
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*/ |
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public function next(): void |
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{ |
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$this->fRange[] = $this->fDifference; |
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if (null !== $this->fDifference) { |
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if ($this->fIndex < \count($this->fArray)) { |
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$this->fDifference = $this->fArray[$this->fIndex++]; |
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} else { |
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$this->fDifference = null; |
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} |
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} |
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} |
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/** |
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* Difference iterators are used in pairs. This method returns the other iterator. |
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* |
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* @param DifferencesIterator $right |
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* @param DifferencesIterator $left |
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* @return DifferencesIterator |
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*/ |
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public function other( |
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DifferencesIterator $right, |
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DifferencesIterator $left |
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): DifferencesIterator { |
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if ($this === $right) { |
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return $left; |
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} |
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return $right; |
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} |
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/** |
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* Removes all RangeDifference. |
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*/ |
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public function removeAll(): void |
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{ |
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$this->fRange = []; |
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} |
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} |
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snebes /
range-differencer
