Update cells that use structured references in formula, and defined names, when a table column heading is changed

src/PhpSpreadsheet/Cell/Cell.php

@@ -8,9 +8,11 @@ use PhpOffice\PhpSpreadsheet\Collection\Cells;
 use PhpOffice\PhpSpreadsheet\Exception;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDate;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Style\ConditionalFormatting\CellStyleAssessor;
 use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
 use PhpOffice\PhpSpreadsheet\Style\Style;
+use PhpOffice\PhpSpreadsheet\Worksheet\Table;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class Cell
@@ -190,6 +192,29 @@ class Cell
         );
     }
 
+    /**
+     * @param mixed $oldValue
+     * @param mixed $newValue
+     */
+    protected static function updateIfCellIsTableHeader(Worksheet $workSheet, self $cell, $oldValue, $newValue): void
+    {
+        if (StringHelper::strToLower($oldValue ?? '') === StringHelper::strToLower($newValue ?? '')) {
+            return;
+        }
+
+        foreach ($workSheet->getTableCollection() as $table) {
+            /** @var Table $table */
+            if ($cell->isInRange($table->getRange())) {
+                $rangeRowsColumns = Coordinate::getRangeBoundaries($table->getRange());
+                if ($cell->getRow() === (int) $rangeRowsColumns[0][1]) {
+                    Table\Column::updateStructuredReferences($workSheet, $oldValue, $newValue);
+                }
+
+                return;
+            }
+        }
+    }
+
     /**
      * Set cell value.
      *
@@ -221,8 +246,10 @@ class Cell
      *
      * @return Cell
      */
-    public function setValueExplicit($value, $dataType)
+    public function setValueExplicit($value, string $dataType = DataType::TYPE_STRING)
     {
+        $oldValue = $this->value;
+
         // set the value according to data type
         switch ($dataType) {
             case DataType::TYPE_NULL:
@@ -270,7 +297,11 @@ class Cell
         // set the datatype
         $this->dataType = $dataType;
 
-        return $this->updateInCollection();
+        $this->updateInCollection();
+        $cellCoordinate = $this->getCoordinate();
+        self::updateIfCellIsTableHeader($this->getParent()->getParent(), $this, $oldValue, $value); // @phpstan-ignore-line
+
+        return $this->getParent()->get($cellCoordinate); // @phpstan-ignore-line
     }
 
     public const CALCULATE_DATE_TIME_ASIS = 0;

src/PhpSpreadsheet/Worksheet/Table/Column.php

@@ -2,7 +2,11 @@
 
 namespace PhpOffice\PhpSpreadsheet\Worksheet\Table;
 
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Table;
+use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class Column
 {
@@ -200,4 +204,51 @@ class Column
 
         return $this;
     }
+
+    public static function updateStructuredReferences(?Worksheet $workSheet, ?string $oldTitle, string $newTitle): void
+    {
+        if ($workSheet === null || $oldTitle === null || $oldTitle === '') {
+            return;
+        }
+
+        // Remember that table headings are case-insensitive
+        if (StringHelper::strToLower($oldTitle) !== StringHelper::strToLower($newTitle)) {
+            // We need to check all formula cells that might contain Structured References that refer
+            //    to this column, and update those formulae to reference the new column text
+            $spreadsheet = $workSheet->getParent();
+            foreach ($spreadsheet->getWorksheetIterator() as $sheet) {
+                self::updateStructuredReferencesInCells($sheet, $oldTitle, $newTitle);
+            }
+            self::updateStructuredReferencesInNamedFormulae($spreadsheet, $oldTitle, $newTitle);
+        }
+    }
+
+    private static function updateStructuredReferencesInCells(Worksheet $worksheet, string $oldTitle, string $newTitle): void
+    {
+        $pattern = '/\[(@?)' . preg_quote($oldTitle) . '\]/mui';
+
+        foreach ($worksheet->getCoordinates(false) as $coordinate) {
+            $cell = $worksheet->getCell($coordinate);
+            if ($cell->getDataType() === DataType::TYPE_FORMULA) {
+                $formula = $cell->getValue();
+                if (preg_match($pattern, $formula) === 1) {
+                    $formula = preg_replace($pattern, "[$1{$newTitle}]", $formula);
+                    $cell->setValueExplicit($formula, DataType::TYPE_FORMULA);
+                }
+            }
+        }
+    }
+
+    private static function updateStructuredReferencesInNamedFormulae(Spreadsheet $spreadsheet, string $oldTitle, string $newTitle): void
+    {
+        $pattern = '/\[(@?)' . preg_quote($oldTitle) . '\]/mui';
+
+        foreach ($spreadsheet->getNamedFormulae() as $namedFormula) {
+            $formula = $namedFormula->getValue();
+            if (preg_match($pattern, $formula) === 1) {
+                $formula = preg_replace($pattern, "[$1{$newTitle}]", $formula);
+                $namedFormula->setValue($formula); // @phpstan-ignore-line
+            }
+        }
+    }
 }