Bugfix to ensure that current cell is maintained when executing formula calculations

Author: MarkBaker

Classes/PHPExcel/Calculation.php

@@ -194,6 +194,8 @@ class PHPExcel_Calculation {
 	 */
 	private $_cyclicReferenceStack;
 
+	private $_cellStack = array();
+
 	/**
 	 * Current iteration counter for cyclic formulae
 	 * If the value is 0 (or less) then cyclic formulae will throw an exception,
@@ -2240,9 +2242,17 @@ public function calculateCellValue(PHPExcel_Cell $pCell = NULL, $resetLog = TRUE
 		}
 
 		//	Execute the calculation for the cell formula
+        $this->_cellStack[] = array(
+            'sheet' => $pCell->getWorksheet()->getTitle(),
+            'cell' => $pCell->getCoordinate(),
+        );
 		try {
 			$result = self::_unwrapResult($this->_calculateFormulaValue($pCell->getValue(), $pCell->getCoordinate(), $pCell));
+            $cellAddress = array_pop($this->_cellStack);
+            $this->_workbook->getSheetByName($cellAddress['sheet'])->getCell($cellAddress['cell']);
 		} catch (PHPExcel_Exception $e) {
+            $cellAddress = array_pop($this->_cellStack);
+            $this->_workbook->getSheetByName($cellAddress['sheet'])->getCell($cellAddress['cell']);
 			throw new PHPExcel_Calculation_Exception($e->getMessage());
 		}
 

changelog.txt

@@ -25,6 +25,7 @@
 Planned for v1.8.1
 - Bugfix:   (goncons)         Work Item GH-397  - Fix for Writing an Open Document cell with non-numeric formula
 - Bugfix:   (sarciszewski)    Work Item GH-329  - Avoid potential divide by zero in basedrawing
+- Bugfix:   (MBaker)                            - Fix to ensure that current cell is maintained when executing formula calculations
 - General:  (MBaker)                            - Small performance improvement for autosize columns
 - Feature:  (WiktrzGE)        Work Item GH-404  - Methods to manage most of the existing options for Chart Axis, Major Grid-lines and Minor Grid-lines
 - Feature:  (frost-nzcr4)     Work Item GH-403  - ODS read/write comments in the cell