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<?php
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namespace PhpOffice\PhpSpreadsheet\Worksheet;
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use PhpOffice\PhpSpreadsheet\Spreadsheet;
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/**
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 * @implements \Iterator<int, Worksheet>
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 */
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class Iterator implements \Iterator
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{
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    /**
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     * Spreadsheet to iterate.
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     *
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     * @var Spreadsheet
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     */
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    private $subject;
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    /**
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     * Current iterator position.
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     *
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     * @var int
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     */
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    private $position = 0;
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    /**
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     * Create a new worksheet iterator.
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     */
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    public function __construct(Spreadsheet $subject)
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    {
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        // Set subject
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        $this->subject = $subject;
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    }
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    /**
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     * Rewind iterator.
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     */
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    public function rewind(): void
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    {
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        $this->position = 0;
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    }
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    /**
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     * Current Worksheet.
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     */
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    public function current(): Worksheet
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    {
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        return $this->subject->getSheet($this->position);
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    }
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    /**
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     * Current key.
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     */
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    public function key(): int
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    {
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        return $this->position;
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    }
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    /**
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     * Next value.
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     */
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    public function next(): void
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    {
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        ++$this->position;
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    }
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    /**
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     * Are there more Worksheet instances available?
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     */
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    public function valid(): bool
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    {
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        return $this->position < $this->subject->getSheetCount() && $this->position >= 0;
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    }
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}