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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
use PhpOffice\PhpSpreadsheet\Cell\Cell;
use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
class Offset
{
/**
* OFFSET.
*
* Returns a reference to a range that is a specified number of rows and columns from a cell or range of cells.
* The reference that is returned can be a single cell or a range of cells. You can specify the number of rows and
* the number of columns to be returned.
*
* Excel Function:
* =OFFSET(cellAddress, rows, cols, [height], [width])
*
* @param null|string $cellAddress The reference from which you want to base the offset.
* Reference must refer to a cell or range of adjacent cells;
* otherwise, OFFSET returns the #VALUE! error value.
* @param mixed $rows The number of rows, up or down, that you want the upper-left cell to refer to.
* Using 5 as the rows argument specifies that the upper-left cell in the
* reference is five rows below reference. Rows can be positive (which means
* below the starting reference) or negative (which means above the starting
* reference).
* @param mixed $columns The number of columns, to the left or right, that you want the upper-left cell
* of the result to refer to. Using 5 as the cols argument specifies that the
* upper-left cell in the reference is five columns to the right of reference.
* Cols can be positive (which means to the right of the starting reference)
* or negative (which means to the left of the starting reference).
* @param mixed $height The height, in number of rows, that you want the returned reference to be.
* Height must be a positive number.
* @param mixed $width The width, in number of columns, that you want the returned reference to be.
* Width must be a positive number.
*
* @return array|int|string An array containing a cell or range of cells, or a string on error
*/
public static function OFFSET($cellAddress = null, $rows = 0, $columns = 0, $height = null, $width = null, ?Cell $cell = null)
{
$rows = Functions::flattenSingleValue($rows);
$columns = Functions::flattenSingleValue($columns);
$height = Functions::flattenSingleValue($height);
$width = Functions::flattenSingleValue($width);
if ($cellAddress === null || $cellAddress === '') {
return ExcelError::VALUE();
}
if (!is_object($cell)) {
return ExcelError::REF();
}
[$cellAddress, $worksheet] = self::extractWorksheet($cellAddress, $cell);
$startCell = $endCell = $cellAddress;
if (strpos($cellAddress, ':')) {
[$startCell, $endCell] = explode(':', $cellAddress);
}
[$startCellColumn, $startCellRow] = Coordinate::coordinateFromString($startCell);
[$endCellColumn, $endCellRow] = Coordinate::coordinateFromString($endCell);
$startCellRow += $rows;
$startCellColumn = Coordinate::columnIndexFromString($startCellColumn) - 1;
$startCellColumn += $columns;
if (($startCellRow <= 0) || ($startCellColumn < 0)) {
return ExcelError::REF();
}
$endCellColumn = self::adjustEndCellColumnForWidth($endCellColumn, $width, $startCellColumn, $columns);
$startCellColumn = Coordinate::stringFromColumnIndex($startCellColumn + 1);
$endCellRow = self::adustEndCellRowForHeight($height, $startCellRow, $rows, $endCellRow);
if (($endCellRow <= 0) || ($endCellColumn < 0)) {
return ExcelError::REF();
}
$endCellColumn = Coordinate::stringFromColumnIndex($endCellColumn + 1);
$cellAddress = "{$startCellColumn}{$startCellRow}";
if (($startCellColumn != $endCellColumn) || ($startCellRow != $endCellRow)) {
$cellAddress .= ":{$endCellColumn}{$endCellRow}";
}
return self::extractRequiredCells($worksheet, $cellAddress);
}
private static function extractRequiredCells(?Worksheet $worksheet, string $cellAddress)
{
return Calculation::getInstance($worksheet !== null ? $worksheet->getParent() : null)
->extractCellRange($cellAddress, $worksheet, false);
}
private static function extractWorksheet($cellAddress, Cell $cell): array
{
$cellAddress = self::assessCellAddress($cellAddress, $cell);
$sheetName = '';
if (strpos($cellAddress, '!') !== false) {
[$sheetName, $cellAddress] = Worksheet::extractSheetTitle($cellAddress, true);
$sheetName = trim($sheetName, "'");
}
$worksheet = ($sheetName !== '')
? $cell->getWorksheet()->getParent()->getSheetByName($sheetName)
: $cell->getWorksheet();
return [$cellAddress, $worksheet];
}
private static function assessCellAddress(string $cellAddress, Cell $cell): string
{
if (preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/mui', $cellAddress) !== false) {
$cellAddress = Functions::expandDefinedName($cellAddress, $cell);
}
return $cellAddress;
}
private static function adjustEndCellColumnForWidth(string $endCellColumn, $width, int $startCellColumn, $columns)
{
$endCellColumn = Coordinate::columnIndexFromString($endCellColumn) - 1;
if (($width !== null) && (!is_object($width))) {
$endCellColumn = $startCellColumn + (int) $width - 1;
} else {
$endCellColumn += (int) $columns;
}
return $endCellColumn;
}
private static function adustEndCellRowForHeight($height, int $startCellRow, $rows, $endCellRow): int
{
if (($height !== null) && (!is_object($height))) {
$endCellRow = $startCellRow + (int) $height - 1;
} else {
$endCellRow += (int) $rows;
}
return $endCellRow;
}
}
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