<?php

namespace PhpOffice\PhpSpreadsheet\Cell;

use PhpOffice\PhpSpreadsheet\Exception;

class AddressHelper
{

>     public const R1C1_COORDINATE_REGEX = '/(R((?:\[-?\d*\])|(?:\d*))?)(C((?:\[-?\d*\])|(?:\d*))?)/i';
    /**
> 


     * Converts an R1C1 format cell address to an A1 format cell address.
     */
    public static function convertToA1(
        string $address,
        int $currentRowNumber = 1,
        int $currentColumnNumber = 1
    ): string {
        $validityCheck = preg_match('/^(R(\[?-?\d*\]?))(C(\[?-?\d*\]?))$/i', $address, $cellReference);

        if ($validityCheck === 0) {
            throw new Exception('Invalid R1C1-format Cell Reference');
        }

        $rowReference = $cellReference[2];
        //    Empty R reference is the current row
        if ($rowReference === '') {
            $rowReference = (string) $currentRowNumber;
        }
        //    Bracketed R references are relative to the current row
        if ($rowReference[0] === '[') {

<             $rowReference = $currentRowNumber + trim($rowReference, '[]');



>             $rowReference = $currentRowNumber + (int) trim($rowReference, '[]');


        }
        $columnReference = $cellReference[4];
        //    Empty C reference is the current column
        if ($columnReference === '') {
            $columnReference = (string) $currentColumnNumber;
        }
        //    Bracketed C references are relative to the current column
        if (is_string($columnReference) && $columnReference[0] === '[') {

<             $columnReference = $currentColumnNumber + trim($columnReference, '[]');



>             $columnReference = $currentColumnNumber + (int) trim($columnReference, '[]');


        }

        if ($columnReference <= 0 || $rowReference <= 0) {
            throw new Exception('Invalid R1C1-format Cell Reference, Value out of range');
        }
        $A1CellReference = Coordinate::stringFromColumnIndex($columnReference) . $rowReference;

        return $A1CellReference;
    }


>     protected static function convertSpreadsheetMLFormula(string $formula): string
    /**
>     {
     * Converts a formula that uses R1C1 format cell address to an A1 format cell address.
>         $formula = substr($formula, 3);
     */
>         $temp = explode('"', $formula);
    public static function convertFormulaToA1(
>         $key = false;
        string $formula,
>         foreach ($temp as &$value) {
        int $currentRowNumber = 1,
>             //    Only replace in alternate array entries (i.e. non-quoted blocks)
        int $currentColumnNumber = 1
>             if ($key = !$key) {
    ): string {
>                 $value = str_replace(['[.', ':.', ']'], ['', ':', ''], $value);
        if (substr($formula, 0, 3) == 'of:') {
>             }
            $formula = substr($formula, 3);
>         }
            $temp = explode('"', $formula);
>         unset($value);
            $key = false;
> 
            foreach ($temp as &$value) {
>         return implode('"', $temp);
                //    Only replace in alternate array entries (i.e. non-quoted blocks)
>     }
                if ($key = !$key) {
> 



<      * Converts a formula that uses R1C1 format cell address to an A1 format cell address.



>      * Converts a formula that uses R1C1/SpreadsheetXML format cell address to an A1 format cell address.



<             $formula = substr($formula, 3);
<             $temp = explode('"', $formula);
<             $key = false;
<             foreach ($temp as &$value) {
<                 //    Only replace in alternate array entries (i.e. non-quoted blocks)
<                 if ($key = !$key) {
<                     $value = str_replace(['[.', '.', ']'], '', $value);
<                 }



>             // We have an old-style SpreadsheetML Formula
>             return self::convertSpreadsheetMLFormula($formula);



<         } else {



> 



<                     preg_match_all('/(R(\[?-?\d*\]?))(C(\[?-?\d*\]?))/', $value, $cellReferences, PREG_SET_ORDER + PREG_OFFSET_CAPTURE);



>                 preg_match_all(self::R1C1_COORDINATE_REGEX, $value, $cellReferences, PREG_SET_ORDER + PREG_OFFSET_CAPTURE);


                    //    Reverse the matches array, otherwise all our offsets will become incorrect if we modify our way
                    //        through the formula from left to right. Reversing means that we work right to left.through
                    //        the formula
                    $cellReferences = array_reverse($cellReferences);
                    //    Loop through each R1C1 style reference in turn, converting it to its A1 style equivalent,
                    //        then modify the formula to use that new reference
                    foreach ($cellReferences as $cellReference) {
                        $A1CellReference = self::convertToA1($cellReference[0][0], $currentRowNumber, $currentColumnNumber);
                        $value = substr_replace($value, $A1CellReference, $cellReference[0][1], strlen($cellReference[0][0]));
                    }
                }
            }

<         }


        unset($value);

<         //    Then rebuild the formula string
<         $formula = implode('"', $temp);




<         return $formula;



>         //    Then rebuild the formula string
>         return implode('"', $temp);


    }

    /**
     * Converts an A1 format cell address to an R1C1 format cell address.
     * If $currentRowNumber or $currentColumnNumber are provided, then the R1C1 address will be formatted as a relative address.
     */
    public static function convertToR1C1(
        string $address,
        ?int $currentRowNumber = null,
        ?int $currentColumnNumber = null
    ): string {

<         $validityCheck = preg_match('/^\$?([A-Z]{1,3})\$?(\d{1,7})$/i', $address, $cellReference);



>         $validityCheck = preg_match(Coordinate::A1_COORDINATE_REGEX, $address, $cellReference);



        if ($validityCheck === 0) {
            throw new Exception('Invalid A1-format Cell Reference');
        }


<         $columnId = Coordinate::columnIndexFromString($cellReference[1]);
<         $rowId = (int) $cellReference[2];



>         $columnId = Coordinate::columnIndexFromString($cellReference['col_ref']);
>         if ($cellReference['absolute_col'] === '$') {
>             // Column must be absolute address
>             $currentColumnNumber = null;
>         }
> 
>         $rowId = (int) $cellReference['row_ref'];
>         if ($cellReference['absolute_row'] === '$') {
>             // Row must be absolute address
>             $currentRowNumber = null;
>         }



        if ($currentRowNumber !== null) {
            if ($rowId === $currentRowNumber) {
                $rowId = '';
            } else {
                $rowId = '[' . ($rowId - $currentRowNumber) . ']';
            }
        }

        if ($currentColumnNumber !== null) {
            if ($columnId === $currentColumnNumber) {
                $columnId = '';
            } else {
                $columnId = '[' . ($columnId - $currentColumnNumber) . ']';
            }
        }

        $R1C1Address = "R{$rowId}C{$columnId}";

        return $R1C1Address;
    }
}