Fix sheet reference (#16)

fix #15
Fix `XlsxFastEditor::getWorksheetNumber()` which was not returning the proper number in case of workbooks in which sheets have been reordered or removed.

phpstan.neon

@@ -27,5 +27,7 @@ parameters:
 			missingCheckedExceptionInThrows: true
 			tooWideThrowType: true
 		implicitThrows: false
+	ignoreErrors:
+		- '#Only booleans are allowed in (a negated boolean|a ternary operator condition|an elseif condition|an if condition|&&|\|\|), (bool|false|int(<[0-9, max]+>)?|true|null|\|)+ given.*#'
 includes:
 	- vendor/phpstan/phpstan-strict-rules/rules.neon

src/XlsxFastEditor.php

@@ -27,6 +27,7 @@ final class XlsxFastEditor
 	private const CALC_CHAIN_CACHE_PATH = 'xl/calcChain.xml';
 	private const SHARED_STRINGS_PATH = 'xl/sharedStrings.xml';
 	private const WORKBOOK_PATH = 'xl/workbook.xml';
+	private const WORKBOOK_RELS_PATH = 'xl/_rels/workbook.xml.rels';
 
 	private \ZipArchive $zip;
 
@@ -280,9 +281,24 @@ public function getWorksheetCount(): int
 	public function getWorksheetNumber(string $sheetName): int
 	{
 		$xpath = $this->getXPathFromPath(self::WORKBOOK_PATH);
-		$sheetId = $xpath->evaluate("normalize-space(/o:workbook/o:sheets/o:sheet[@name='$sheetName'][1]/@sheetId)");
-		if (is_string($sheetId)) {
-			return (int)$sheetId;
+		$xpath->registerNamespace('r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');
+		$rId = $xpath->evaluate("normalize-space(/o:workbook/o:sheets/o:sheet[@name='$sheetName'][1]/@r:id)");
+		if (!is_string($rId) || $rId === '') {
+			return -1;
+		}
+
+		try {
+			$xpath = $this->getXPathFromPath(self::WORKBOOK_RELS_PATH);
+			$xpath->registerNamespace('pr', 'http://schemas.openxmlformats.org/package/2006/relationships');
+			$target = $xpath->evaluate("normalize-space(/pr:Relationships/pr:Relationship[@Id='$rId'][1]/@Target)");
+			if (is_string($target) && preg_match('/(\d+)/i', $target, $matches)) {
+				return (int)$matches[1];
+			}
+		} catch (XlsxFastEditorFileFormatException $ex) {	// phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch
+		}
+
+		if (preg_match('/(\d+)/i', $rId, $matches)) {
+			return (int)$matches[1];
 		}
 		return -1;
 	}
@@ -297,7 +313,7 @@ public function getWorksheetNumber(string $sheetName): int
 	public function getWorksheetName(int $sheetNumber): ?string
 	{
 		$xpath = $this->getXPathFromPath(self::WORKBOOK_PATH);
-		$sheetName = $xpath->evaluate("normalize-space(/o:workbook/o:sheets/o:sheet[$sheetNumber][1]/@name)");
+		$sheetName = $xpath->evaluate("normalize-space(/o:workbook/o:sheets/o:sheet[$sheetNumber]/@name)");
 		return is_string($sheetName) ? $sheetName : null;
 	}
 

tests/test.php

@@ -26,7 +26,7 @@
 	assert(XlsxFastEditor::excelDateToDateTime(44865, 1904)->format('c') === '2026-11-01T00:00:00+00:00');
 
 	$sheet1 = $xlsxFastEditor->getWorksheetNumber('Sheet1');
-	assert($sheet1 === 1);
+	assert($sheet1 === 3);
 
 	assert($xlsxFastEditor->deleteRow($sheet1, 5) === true);
 
@@ -42,7 +42,6 @@
 	assert($xlsxFastEditor->readHyperlink($sheet1, 'C3') === null);
 
 	$sheet2 = $xlsxFastEditor->getWorksheetNumber('Sheet2');
-	assert($sheet2 === 2);
 	assert($xlsxFastEditor->getWorksheetName($sheet2) === 'Sheet2');
 
 	assert($xlsxFastEditor->readFormula($sheet2, 'c2') === '=Sheet1!C2*2');
@@ -66,7 +65,7 @@
 	assert($xlsxFastEditor->getLastRow($sheet1)?->number() === 4);
 
 	$sheet3 = $xlsxFastEditor->getWorksheetNumber('Sheet3');
-	assert($sheet3 === 3);
+	assert($xlsxFastEditor->getWorksheetName($sheet3) === 'Sheet3');
 	assert($xlsxFastEditor->getHighestColumnName($sheet3) === 'G');
 
 	$row4 = $xlsxFastEditor->getRow($sheet1, 4);