File Source for ReferenceHelper.php

<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2010 PHPExcel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* @category PHPExcel
* @package PHPExcel
* @copyright Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 1.7.4, 2010-08-26
*/
/**
* PHPExcel_ReferenceHelper (Singleton)
*
* @category PHPExcel
* @package PHPExcel
* @copyright Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
*/
class PHPExcel_ReferenceHelper
{
/** Constants */
/** Regular Expressions */
const REFHELPER_REGEXP_CELLREF = '((\w*|\'[^!]*\')!)?(?<![:a-z\$])(\$?[a-z]{1,3}\$?\d+)(?=[^:!\d\'])';
const REFHELPER_REGEXP_CELLRANGE = '((\w*|\'[^!]*\')!)?(\$?[a-z]{1,3}\$?\d+):(\$?[a-z]{1,3}\$?\d+)';
const REFHELPER_REGEXP_ROWRANGE = '((\w*|\'[^!]*\')!)?(\$?\d+):(\$?\d+)';
const REFHELPER_REGEXP_COLRANGE = '((\w*|\'[^!]*\')!)?(\$?[a-z]{1,3}):(\$?[a-z]{1,3})';
/**
* Instance of this class
*
* @var PHPExcel_ReferenceHelper
*/
private static $_instance;
/**
* Get an instance of this class
*
* @return PHPExcel_ReferenceHelper
*/
public static function getInstance() {
if (!isset(self::$_instance) || is_null(self::$_instance)) {
self::$_instance = new PHPExcel_ReferenceHelper();
}
return self::$_instance;
}
/**
* Create a new PHPExcel_ReferenceHelper
*/
protected function __construct() {
}
/**
* Insert a new column, updating all possible related data
*
* @param int $pBefore Insert before this one
* @param int $pNumCols Number of columns to insert
* @param int $pNumRows Number of rows to insert
* @throws Exception
*/
public function insertNewBefore($pBefore = 'A1', $pNumCols = 0, $pNumRows = 0, PHPExcel_Worksheet $pSheet = null) {
$aCellCollection = $pSheet->getCellCollection();
// Get coordinates of $pBefore
$beforeColumn = 'A';
$beforeRow = 1;
list($beforeColumn, $beforeRow) = PHPExcel_Cell::coordinateFromString( $pBefore );
// Clear cells if we are removing columns or rows
$highestColumn = $pSheet->getHighestColumn();
$highestRow = $pSheet->getHighestRow();
// 1. Clear column strips if we are removing columns
if ($pNumCols < 0 && PHPExcel_Cell::columnIndexFromString($beforeColumn) - 2 + $pNumCols > 0) {
for ($i = 1; $i <= $highestRow - 1; ++$i) {
for ($j = PHPExcel_Cell::columnIndexFromString($beforeColumn) - 1 + $pNumCols; $j <= PHPExcel_Cell::columnIndexFromString($beforeColumn) - 2; ++$j) {
$coordinate = PHPExcel_Cell::stringFromColumnIndex($j) . $i;
$pSheet->removeConditionalStyles($coordinate);
if ($pSheet->cellExists($coordinate)) {
$pSheet->getCell($coordinate)->setValueExplicit('', PHPExcel_Cell_DataType::TYPE_NULL);
$pSheet->getCell($coordinate)->setXfIndex(0);
}
}
}
}
// 2. Clear row strips if we are removing rows
if ($pNumRows < 0 && $beforeRow - 1 + $pNumRows > 0) {
for ($i = PHPExcel_Cell::columnIndexFromString($beforeColumn) - 1; $i <= PHPExcel_Cell::columnIndexFromString($highestColumn) - 1; ++$i) {
for ($j = $beforeRow + $pNumRows; $j <= $beforeRow - 1; ++$j) {
$coordinate = PHPExcel_Cell::stringFromColumnIndex($i) . $j;
$pSheet->removeConditionalStyles($coordinate);
if ($pSheet->cellExists($coordinate)) {
$pSheet->getCell($coordinate)->setValueExplicit('', PHPExcel_Cell_DataType::TYPE_NULL);
$pSheet->getCell($coordinate)->setXfIndex(0);
}
}
}
}
// Loop through cells, bottom-up, and change cell coordinates
while (($cellID = ($pNumCols < 0 || $pNumRows < 0) ? array_shift($aCellCollection) : array_pop($aCellCollection))) {
$cell = $pSheet->getCell($cellID);
// New coordinates
$newCoordinates = PHPExcel_Cell::stringFromColumnIndex( PHPExcel_Cell::columnIndexFromString($cell->getColumn()) - 1 + $pNumCols ) . ($cell->getRow() + $pNumRows);
// Should the cell be updated? Move value and cellXf index from one cell to another.
if ((PHPExcel_Cell::columnIndexFromString( $cell->getColumn() ) >= PHPExcel_Cell::columnIndexFromString($beforeColumn)) &&
($cell->getRow() >= $beforeRow)) {
// Update cell styles
$pSheet->getCell($newCoordinates)->setXfIndex($cell->getXfIndex());
$cell->setXfIndex(0);
// Insert this cell at its new location
if ($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_FORMULA) {
// Formula should be adjusted
$pSheet->getCell($newCoordinates)
->setValue($this->updateFormulaReferences($cell->getValue(), $pBefore, $pNumCols, $pNumRows, $pSheet->getTitle()));
} else {
// Formula should not be adjusted
$pSheet->getCell($newCoordinates)->setValue($cell->getValue());
}
// Clear the original cell
$pSheet->getCell($cell->getCoordinate())->setValue('');
}
}
// Duplicate styles for the newly inserted cells
$highestColumn = $pSheet->getHighestColumn();
$highestRow = $pSheet->getHighestRow();
if ($pNumCols > 0 && PHPExcel_Cell::columnIndexFromString($beforeColumn) - 2 > 0) {
for ($i = $beforeRow; $i <= $highestRow - 1; ++$i) {
// Style
$coordinate = PHPExcel_Cell::stringFromColumnIndex( PHPExcel_Cell::columnIndexFromString($beforeColumn) - 2 ) . $i;
if ($pSheet->cellExists($coordinate)) {
$xfIndex = $pSheet->getCell($coordinate)->getXfIndex();
$conditionalStyles = $pSheet->conditionalStylesExists($coordinate) ?
$pSheet->getConditionalStyles($coordinate) : false;
for ($j = PHPExcel_Cell::columnIndexFromString($beforeColumn) - 1; $j <= PHPExcel_Cell::columnIndexFromString($beforeColumn) - 2 + $pNumCols; ++$j) {
$pSheet->getCellByColumnAndRow($j, $i)->setXfIndex($xfIndex);
if ($conditionalStyles) {
$cloned = array();
foreach ($conditionalStyles as $conditionalStyle) {
$cloned[] = clone $conditionalStyle;
}
$pSheet->setConditionalStyles(PHPExcel_Cell::stringFromColumnIndex($j) . $i, $cloned);
}
}
}
}
}
if ($pNumRows > 0 && $beforeRow - 1 > 0) {
for ($i = PHPExcel_Cell::columnIndexFromString($beforeColumn) - 1; $i <= PHPExcel_Cell::columnIndexFromString($highestColumn) - 1; ++$i) {
// Style
$coordinate = PHPExcel_Cell::stringFromColumnIndex($i) . ($beforeRow - 1);
if ($pSheet->cellExists($coordinate)) {
$xfIndex = $pSheet->getCell($coordinate)->getXfIndex();
$conditionalStyles = $pSheet->conditionalStylesExists($coordinate) ?
$pSheet->getConditionalStyles($coordinate) : false;
for ($j = $beforeRow; $j <= $beforeRow - 1 + $pNumRows; ++$j) {
$pSheet->getCell(PHPExcel_Cell::stringFromColumnIndex($i) . $j)->setXfIndex($xfIndex);
if ($conditionalStyles) {
$cloned = array();
foreach ($conditionalStyles as $conditionalStyle) {
$cloned[] = clone $conditionalStyle;
}
$pSheet->setConditionalStyles(PHPExcel_Cell::stringFromColumnIndex($i) . $j, $cloned);
}
}
}
}
}
// Update worksheet: column dimensions
$aColumnDimensions = array_reverse($pSheet->getColumnDimensions(), true);
if (count($aColumnDimensions) > 0) {
foreach ($aColumnDimensions as $objColumnDimension) {
$newReference = $this->updateCellReference($objColumnDimension->getColumnIndex() . '1', $pBefore, $pNumCols, $pNumRows);
list($newReference) = PHPExcel_Cell::coordinateFromString($newReference);
if ($objColumnDimension->getColumnIndex() != $newReference) {
$objColumnDimension->setColumnIndex($newReference);
}
}
$pSheet->refreshColumnDimensions();
}
// Update worksheet: row dimensions
$aRowDimensions = array_reverse($pSheet->getRowDimensions(), true);
if (count($aRowDimensions) > 0) {
foreach ($aRowDimensions as $objRowDimension) {
$newReference = $this->updateCellReference('A' . $objRowDimension->getRowIndex(), $pBefore, $pNumCols, $pNumRows);
list(, $newReference) = PHPExcel_Cell::coordinateFromString($newReference);
if ($objRowDimension->getRowIndex() != $newReference) {
$objRowDimension->setRowIndex($newReference);
}
}
$pSheet->refreshRowDimensions();
$copyDimension = $pSheet->getRowDimension($beforeRow - 1);
for ($i = $beforeRow; $i <= $beforeRow - 1 + $pNumRows; ++$i) {
$newDimension = $pSheet->getRowDimension($i);
$newDimension->setRowHeight($copyDimension->getRowHeight());
$newDimension->setVisible($copyDimension->getVisible());
$newDimension->setOutlineLevel($copyDimension->getOutlineLevel());
$newDimension->setCollapsed($copyDimension->getCollapsed());
}
}
// Update worksheet: breaks
$aBreaks = array_reverse($pSheet->getBreaks(), true);
foreach ($aBreaks as $key => $value) {
$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
if ($key != $newReference) {
$pSheet->setBreak( $newReference, $value );
$pSheet->setBreak( $key, PHPExcel_Worksheet::BREAK_NONE );
}
}
// Update worksheet: hyperlinks
$aHyperlinkCollection = array_reverse($pSheet->getHyperlinkCollection(), true);
foreach ($aHyperlinkCollection as $key => $value) {
$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
if ($key != $newReference) {
$pSheet->setHyperlink( $newReference, $value );
$pSheet->setHyperlink( $key, null );
}
}
// Update worksheet: data validations
$aDataValidationCollection = array_reverse($pSheet->getDataValidationCollection(), true);
foreach ($aDataValidationCollection as $key => $value) {
$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
if ($key != $newReference) {
$pSheet->setDataValidation( $newReference, $value );
$pSheet->setDataValidation( $key, null );
}
}
// Update worksheet: merge cells
$aMergeCells = $pSheet->getMergeCells();
$aNewMergeCells = array(); // the new array of all merge cells
foreach ($aMergeCells as $key => &$value) {
$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
$aNewMergeCells[$newReference] = $newReference;
}
$pSheet->setMergeCells($aNewMergeCells); // replace the merge cells array
// Update worksheet: protected cells
$aProtectedCells = array_reverse($pSheet->getProtectedCells(), true);
foreach ($aProtectedCells as $key => $value) {
$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
if ($key != $newReference) {
$pSheet->protectCells( $newReference, $value, true );
$pSheet->unprotectCells( $key );
}
}
// Update worksheet: autofilter
if ($pSheet->getAutoFilter() != '') {
$pSheet->setAutoFilter( $this->updateCellReference($pSheet->getAutoFilter(), $pBefore, $pNumCols, $pNumRows) );
}
// Update worksheet: freeze pane
if ($pSheet->getFreezePane() != '') {
$pSheet->freezePane( $this->updateCellReference($pSheet->getFreezePane(), $pBefore, $pNumCols, $pNumRows) );
}
// Page setup
if ($pSheet->getPageSetup()->isPrintAreaSet()) {
$pSheet->getPageSetup()->setPrintArea( $this->updateCellReference($pSheet->getPageSetup()->getPrintArea(), $pBefore, $pNumCols, $pNumRows) );
}
// Update worksheet: drawings
$aDrawings = $pSheet->getDrawingCollection();
foreach ($aDrawings as $objDrawing) {
$newReference = $this->updateCellReference($objDrawing->getCoordinates(), $pBefore, $pNumCols, $pNumRows);
if ($objDrawing->getCoordinates() != $newReference) {
$objDrawing->setCoordinates($newReference);
}
}
// Update workbook: named ranges
if (count($pSheet->getParent()->getNamedRanges()) > 0) {
foreach ($pSheet->getParent()->getNamedRanges() as $namedRange) {
if ($namedRange->getWorksheet()->getHashCode() == $pSheet->getHashCode()) {
$namedRange->setRange(
$this->updateCellReference($namedRange->getRange(), $pBefore, $pNumCols, $pNumRows)
);
}
}
}
// Garbage collect
$pSheet->garbageCollect();
}
/**
* Update references within formulas
*
* @param string $pFormula Formula to update
* @param int $pBefore Insert before this one
* @param int $pNumCols Number of columns to insert
* @param int $pNumRows Number of rows to insert
* @return string Updated formula
* @throws Exception
*/
public function updateFormulaReferences($pFormula = '', $pBefore = 'A1', $pNumCols = 0, $pNumRows = 0, $sheetName = '') {
// Update cell references in the formula
$formulaBlocks = explode('"',$pFormula);
foreach($formulaBlocks as $i => &$formulaBlock) {
// Ignore blocks that were enclosed in quotes (even entries in the $formulaBlocks array after the explode)
if (($i % 2) == 0) {
$adjustCount = 0;
$newCellTokens = $cellTokens = array();
// Search for row ranges (e.g. 'Sheet1'!3:5 or 3:5) with or without $ absolutes (e.g. $3:5)
$matchCount = preg_match_all('/'.self::REFHELPER_REGEXP_ROWRANGE.'/i', ' '.$formulaBlock.' ', $matches, PREG_SET_ORDER);
if ($matchCount > 0) {
foreach($matches as $match) {
$fromString = ($match[2] > '') ? $match[2].'!' : '';
$fromString .= $match[3].':'.$match[4];
$modified3 = substr($this->updateCellReference('$A'.$match[3],$pBefore,$pNumCols,$pNumRows),2);
$modified4 = substr($this->updateCellReference('$A'.$match[4],$pBefore,$pNumCols,$pNumRows),2);
if ($match[3].':'.$match[4] !== $modified3.':'.$modified4) {
if (($match[2] == '') || (trim($match[2],"'") == $sheetName)) {
$toString = ($match[2] > '') ? $match[2].'!' : '';
$toString .= $modified3.':'.$modified4;
// Max worksheet size is 1,048,576 rows by 16,384 columns in Excel 2007, so our adjustments need to be at least one digit more
$column = 100000;
$row = 10000000+trim($match[3],'$');
$cellIndex = $column.$row;
$newCellTokens[$cellIndex] = preg_quote($toString);
$cellTokens[$cellIndex] = '/(?<!\d)'.preg_quote($fromString).'(?!\d)/i';
++$adjustCount;
}
}
}
}
// Search for column ranges (e.g. 'Sheet1'!C:E or C:E) with or without $ absolutes (e.g. $C:E)
$matchCount = preg_match_all('/'.self::REFHELPER_REGEXP_COLRANGE.'/i', ' '.$formulaBlock.' ', $matches, PREG_SET_ORDER);
if ($matchCount > 0) {
foreach($matches as $match) {
$fromString = ($match[2] > '') ? $match[2].'!' : '';
$fromString .= $match[3].':'.$match[4];
$modified3 = substr($this->updateCellReference($match[3].'$1',$pBefore,$pNumCols,$pNumRows),0,-2);
$modified4 = substr($this->updateCellReference($match[4].'$1',$pBefore,$pNumCols,$pNumRows),0,-2);
if ($match[3].':'.$match[4] !== $modified3.':'.$modified4) {
if (($match[2] == '') || (trim($match[2],"'") == $sheetName)) {
$toString = ($match[2] > '') ? $match[2].'!' : '';
$toString .= $modified3.':'.$modified4;
// Max worksheet size is 1,048,576 rows by 16,384 columns in Excel 2007, so our adjustments need to be at least one digit more
$column = PHPExcel_Cell::columnIndexFromString(trim($match[3],'$')) + 100000;
$row = 10000000;
$cellIndex = $column.$row;
$newCellTokens[$cellIndex] = preg_quote($toString);
$cellTokens[$cellIndex] = '/(?<![A-Z])'.preg_quote($fromString).'(?![A-Z])/i';
++$adjustCount;
}
}
}
}
// Search for cell ranges (e.g. 'Sheet1'!A3:C5 or A3:C5) with or without $ absolutes (e.g. $A1:C$5)
$matchCount = preg_match_all('/'.self::REFHELPER_REGEXP_CELLRANGE.'/i', ' '.$formulaBlock.' ', $matches, PREG_SET_ORDER);
if ($matchCount > 0) {
foreach($matches as $match) {
$fromString = ($match[2] > '') ? $match[2].'!' : '';
$fromString .= $match[3].':'.$match[4];
$modified3 = $this->updateCellReference($match[3],$pBefore,$pNumCols,$pNumRows);
$modified4 = $this->updateCellReference($match[4],$pBefore,$pNumCols,$pNumRows);
if ($match[3].$match[4] !== $modified3.$modified4) {
if (($match[2] == '') || (trim($match[2],"'") == $sheetName)) {
$toString = ($match[2] > '') ? $match[2].'!' : '';
$toString .= $modified3.':'.$modified4;
list($column,$row) = PHPExcel_Cell::coordinateFromString($match[3]);
// Max worksheet size is 1,048,576 rows by 16,384 columns in Excel 2007, so our adjustments need to be at least one digit more
$column = PHPExcel_Cell::columnIndexFromString(trim($column,'$')) + 100000;
$row = trim($row,'$') + 10000000;
$cellIndex = $column.$row;
$newCellTokens[$cellIndex] = preg_quote($toString);
$cellTokens[$cellIndex] = '/(?<![A-Z])'.preg_quote($fromString).'(?!\d)/i';
++$adjustCount;
}
}
}
}
// Search for cell references (e.g. 'Sheet1'!A3 or C5) with or without $ absolutes (e.g. $A1 or C$5)
$matchCount = preg_match_all('/'.self::REFHELPER_REGEXP_CELLREF.'/i', ' '.$formulaBlock.' ', $matches, PREG_SET_ORDER);
if ($matchCount > 0) {
foreach($matches as $match) {
$fromString = ($match[2] > '') ? $match[2].'!' : '';
$fromString .= $match[3];
$modified3 = $this->updateCellReference($match[3],$pBefore,$pNumCols,$pNumRows);
if ($match[3] !== $modified3) {
if (($match[2] == '') || (trim($match[2],"'") == $sheetName)) {
$toString = ($match[2] > '') ? $match[2].'!' : '';
$toString .= $modified3;
list($column,$row) = PHPExcel_Cell::coordinateFromString($match[3]);
// Max worksheet size is 1,048,576 rows by 16,384 columns in Excel 2007, so our adjustments need to be at least one digit more
$column = PHPExcel_Cell::columnIndexFromString(trim($column,'$')) + 100000;
$row = trim($row,'$') + 10000000;
$cellIndex = $column.$row;
$newCellTokens[$cellIndex] = preg_quote($toString);
$cellTokens[$cellIndex] = '/(?<![A-Z])'.preg_quote($fromString).'(?!\d)/i';
++$adjustCount;
}
}
}
}
if ($adjustCount > 0) {
krsort($cellTokens);
krsort($newCellTokens);
// Update cell references in the formula
$formulaBlock = str_replace('\\','',preg_replace($cellTokens,$newCellTokens,$formulaBlock));
}
}
}
unset($formulaBlock);
// Then rebuild the formula string
return implode('"',$formulaBlocks);
}
/**
* Update cell reference
*
* @param string $pCellRange Cell range
* @param int $pBefore Insert before this one
* @param int $pNumCols Number of columns to increment
* @param int $pNumRows Number of rows to increment
* @return string Updated cell range
* @throws Exception
*/
public function updateCellReference($pCellRange = 'A1', $pBefore = 'A1', $pNumCols = 0, $pNumRows = 0) {
// Is it in another worksheet? Will not have to update anything.
if (strpos($pCellRange, "!") !== false) {
return $pCellRange;
// Is it a range or a single cell?
} elseif (strpos($pCellRange, ':') === false && strpos($pCellRange, ',') === false) {
// Single cell
return $this->_updateSingleCellReference($pCellRange, $pBefore, $pNumCols, $pNumRows);
} elseif (strpos($pCellRange, ':') !== false || strpos($pCellRange, ',') !== false) {
// Range
return $this->_updateCellRange($pCellRange, $pBefore, $pNumCols, $pNumRows);
} else {
// Return original
return $pCellRange;
}
}
/**
* Update named formulas (i.e. containing worksheet references / named ranges)
*
* @param PHPExcel $pPhpExcel Object to update
* @param string $oldName Old name (name to replace)
* @param string $newName New name
*/
public function updateNamedFormulas(PHPExcel $pPhpExcel, $oldName = '', $newName = '') {
if ($oldName == '') {
return;
}
foreach ($pPhpExcel->getWorksheetIterator() as $sheet) {
foreach ($sheet->getCellCollection(false) as $cellID) {
$cell = $sheet->getCell($cellID);
if (!is_null($cell) && $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_FORMULA) {
$formula = $cell->getValue();
if (strpos($formula, $oldName) !== false) {
$formula = str_replace("'" . $oldName . "'!", "'" . $newName . "'!", $formula);
$formula = str_replace($oldName . "!", $newName . "!", $formula);
$cell->setValueExplicit($formula, PHPExcel_Cell_DataType::TYPE_FORMULA);
}
}
}
}
}
/**
* Update cell range
*
* @param string $pCellRange Cell range
* @param int $pBefore Insert before this one
* @param int $pNumCols Number of columns to increment
* @param int $pNumRows Number of rows to increment
* @return string Updated cell range
* @throws Exception
*/
private function _updateCellRange($pCellRange = 'A1:A1', $pBefore = 'A1', $pNumCols = 0, $pNumRows = 0) {
if (strpos($pCellRange,':') !== false || strpos($pCellRange, ',') !== false) {
// Update range
$range = PHPExcel_Cell::splitRange($pCellRange);
for ($i = 0; $i < count($range); ++$i) {
for ($j = 0; $j < count($range[$i]); ++$j) {
$range[$i][$j] = $this->_updateSingleCellReference($range[$i][$j], $pBefore, $pNumCols, $pNumRows);
}
}
// Recreate range string
return PHPExcel_Cell::buildRange($range);
} else {
throw new Exception("Only cell ranges may be passed to this method.");
}
}
/**
* Update single cell reference
*
* @param string $pCellReference Single cell reference
* @param int $pBefore Insert before this one
* @param int $pNumCols Number of columns to increment
* @param int $pNumRows Number of rows to increment
* @return string Updated cell reference
* @throws Exception
*/
private function _updateSingleCellReference($pCellReference = 'A1', $pBefore = 'A1', $pNumCols = 0, $pNumRows = 0) {
if (strpos($pCellReference, ':') === false && strpos($pCellReference, ',') === false) {
// Get coordinates of $pBefore
$beforeColumn = 'A';
$beforeRow = 1;
list($beforeColumn, $beforeRow) = PHPExcel_Cell::coordinateFromString( $pBefore );
// Get coordinates
$newColumn = 'A';
$newRow = 1;
list($newColumn, $newRow) = PHPExcel_Cell::coordinateFromString( $pCellReference );
// Make sure the reference can be used
if ($newColumn == '' && $newRow == '')
{
return $pCellReference;
}
// Verify which parts should be updated
$updateColumn = (PHPExcel_Cell::columnIndexFromString($newColumn) >= PHPExcel_Cell::columnIndexFromString($beforeColumn))
&& (strpos($newColumn, '$') === false)
&& (strpos($beforeColumn, '$') === false);
$updateRow = ($newRow >= $beforeRow)
&& (strpos($newRow, '$') === false)
&& (strpos($beforeRow, '$') === false);
// Create new column reference
if ($updateColumn) {
$newColumn = PHPExcel_Cell::stringFromColumnIndex( PHPExcel_Cell::columnIndexFromString($newColumn) - 1 + $pNumCols );
}
// Create new row reference
if ($updateRow) {
$newRow = $newRow + $pNumRows;
}
// Return new reference
return $newColumn . $newRow;
} else {
throw new Exception("Only single cell references may be passed to this method.");
}
}
/**
* __clone implementation. Cloning should not be allowed in a Singleton!
*
* @throws Exception
*/
public final function __clone() {
throw new Exception("Cloning a Singleton is not allowed!");
}
}

Source for file ReferenceHelper.php