Indirect.php

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<?php
 
namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
 
use Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Cell\Cell;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
class Indirect
{
    private static function a1Format($a1fmt): bool
    {
        $a1fmt = Functions::flattenSingleValue($a1fmt);
        if ($a1fmt === null) {
            return Helpers::CELLADDRESS_USE_A1;
        }
        if (is_string($a1fmt)) {
            throw new Exception(Functions::VALUE());
        }
 
        return (bool) $a1fmt;
    }
 
    private static function validateAddress($cellAddress): string
    {
        $cellAddress = Functions::flattenSingleValue($cellAddress);
        if (!is_string($cellAddress) || !$cellAddress) {
            throw new Exception(Functions::REF());
        }
 
        return $cellAddress;
    }
 
    public static function INDIRECT($cellAddress, $a1fmt, Cell $pCell)
    {
        try {
            $a1 = self::a1Format($a1fmt);
            $cellAddress = self::validateAddress($cellAddress);
        } catch (Exception $e) {
            return $e->getMessage();
        }
 
        [$cellAddress, $pSheet, $sheetName] = Helpers::extractWorksheet($cellAddress, $pCell);
 
        [$cellAddress1, $cellAddress2, $cellAddress] = Helpers::extractCellAddresses($cellAddress, $a1, $pCell->getWorkSheet(), $sheetName);
 
        if (
            (!preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/i', $cellAddress1, $matches)) ||
            (($cellAddress2 !== null) && (!preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/i', $cellAddress2, $matches)))
        ) {
            return Functions::REF();
        }
 
        return self::extractRequiredCells($pSheet, $cellAddress);
    }
 
    private static function extractRequiredCells(?Worksheet $pSheet, string $cellAddress)
    {
        return Calculation::getInstance($pSheet !== null ? $pSheet->getParent() : null)
            ->extractCellRange($cellAddress, $pSheet, false);
    }
}