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<?php declare(strict_types=1);
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/*
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 * This file is part of sebastian/code-unit.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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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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namespace SebastianBergmann\CodeUnit;
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use function array_merge;
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use function count;
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use Countable;
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use IteratorAggregate;
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final class CodeUnitCollection implements Countable, IteratorAggregate
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{
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    /**
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     * @psalm-var list<CodeUnit>
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     */
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    private $codeUnits = [];
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    /**
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     * @psalm-param list<CodeUnit> $items
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     */
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    public static function fromArray(array $items): self
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    {
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        $collection = new self;
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        foreach ($items as $item) {
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            $collection->add($item);
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        }
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        return $collection;
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    }
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    public static function fromList(CodeUnit ...$items): self
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    {
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        return self::fromArray($items);
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    }
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    private function __construct()
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    {
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    }
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    /**
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     * @psalm-return list<CodeUnit>
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     */
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    public function asArray(): array
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    {
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        return $this->codeUnits;
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    }
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    public function getIterator(): CodeUnitCollectionIterator
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    {
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        return new CodeUnitCollectionIterator($this);
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    }
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    public function count(): int
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    {
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        return count($this->codeUnits);
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    }
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    public function isEmpty(): bool
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    {
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        return empty($this->codeUnits);
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    }
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    public function mergeWith(self $other): self
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    {
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        return self::fromArray(
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            array_merge(
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                $this->asArray(),
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                $other->asArray()
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            )
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        );
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    }
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    private function add(CodeUnit $item): void
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    {
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        $this->codeUnits[] = $item;
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    }
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}