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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
abstract class LookupBase
{
/**
* @param mixed $lookup_array
*/
protected static function validateLookupArray($lookup_array): void
{
if (!is_array($lookup_array)) {
throw new Exception(ExcelError::REF());
}
}
protected static function validateIndexLookup(array $lookup_array, $index_number): int
{
// index_number must be a number greater than or equal to 1.
// Excel results are inconsistent when index is non-numeric.
// VLOOKUP(whatever, whatever, SQRT(-1)) yields NUM error, but
// VLOOKUP(whatever, whatever, cellref) yields REF error
// when cellref is '=SQRT(-1)'. So just try our best here.
// Similar results if string (literal yields VALUE, cellRef REF).
if (!is_numeric($index_number)) {
throw new Exception(ExcelError::throwError($index_number));
}
if ($index_number < 1) {
throw new Exception(ExcelError::VALUE());
}
// index_number must be less than or equal to the number of columns in lookup_array
if ((!is_array($lookup_array)) || (empty($lookup_array))) {
throw new Exception(ExcelError::REF());
}
return (int) $index_number;
}
protected static function checkMatch(
bool $bothNumeric,
bool $bothNotNumeric,
bool $notExactMatch,
int $rowKey,
string $cellDataLower,
string $lookupLower,
?int $rowNumber
): ?int {
// remember the last key, but only if datatypes match
if ($bothNumeric || $bothNotNumeric) {
// Spreadsheets software returns first exact match,
// we have sorted and we might have broken key orders
// we want the first one (by its initial index)
if ($notExactMatch) {
$rowNumber = $rowKey;
} elseif (($cellDataLower == $lookupLower) && (($rowNumber === null) || ($rowKey < $rowNumber))) {
$rowNumber = $rowKey;
}
}
return $rowNumber;
}
}
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