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<?php
/**
 *      PHPExcel
 *
 *      Copyright (c) 2006 - 2013 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_Cell
 *      @copyright      Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 *      @license        http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt   LGPL
 *      @version        ##VERSION##, ##DATE##
 */


/**
 *      PHPExcel_Cell
 *
 *      @category   PHPExcel
 *      @package        PHPExcel_Cell
 *      @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Cell
{

        /**
         *  Default range variable constant
         *
         *  @var  string
         */
        const DEFAULT_RANGE = 'A1:A1';

        /**
         *      Value binder to use
         *
         *      @var    PHPExcel_Cell_IValueBinder
         */
        private static $_valueBinder = NULL;

        /**
         *      Value of the cell
         *
         *      @var    mixed
         */
        private $_value;

        /**
         *      Calculated value of the cell (used for caching)
         *      This returns the value last calculated by MS Excel or whichever spreadsheet program was used to
         *              create the original spreadsheet file.
         *      Note that this value is not guaranteed to reflect the actual calculated value because it is
         *              possible that auto-calculation was disabled in the original spreadsheet, and underlying data
         *              values used by the formula have changed since it was last calculated.
         *
         *      @var mixed
         */
        private $_calculatedValue = NULL;

        /**
         *      Type of the cell data
         *
         *      @var    string
         */
        private $_dataType;

        /**
         *      Parent worksheet
         *
         *      @var    PHPExcel_CachedObjectStorage_CacheBase
         */
        private $_parent;

        /**
         *      Index to cellXf
         *
         *      @var    int
         */
        private $_xfIndex;

        /**
         *      Attributes of the formula
         *
         */
        private $_formulaAttributes;


        /**
         *      Send notification to the cache controller
         *
         *      @return void
         **/
        public function notifyCacheController() {
                $this->_parent->updateCacheData($this);

                return $this;
        }

        public function detach() {
                $this->_parent = NULL;
        }

        public function attach(PHPExcel_CachedObjectStorage_CacheBase $parent) {


                $this->_parent = $parent;
        }


        /**
         *      Create a new Cell
         *
         *      @param  mixed                           $pValue
         *      @param  string                          $pDataType
         *      @param  PHPExcel_Worksheet      $pSheet
         *      @throws PHPExcel_Exception
         */
        public function __construct($pValue = NULL, $pDataType = NULL, PHPExcel_Worksheet $pSheet = NULL)
        {
                // Initialise cell value
                $this->_value = $pValue;

                // Set worksheet cache
                $this->_parent = $pSheet->getCellCacheController();

                // Set datatype?
                if ($pDataType !== NULL) {
                        if ($pDataType == PHPExcel_Cell_DataType::TYPE_STRING2)
                                $pDataType = PHPExcel_Cell_DataType::TYPE_STRING;
                        $this->_dataType = $pDataType;
                } else {
                        if (!self::getValueBinder()->bindValue($this, $pValue)) {
                                throw new PHPExcel_Exception("Value could not be bound to cell.");
                        }
                }

                // set default index to cellXf
                $this->_xfIndex = 0;
        }

        /**
         *      Get cell coordinate column
         *
         *      @return string
         */
        public function getColumn()
        {
                return $this->_parent->getCurrentColumn();
        }

        /**
         *      Get cell coordinate row
         *
         *      @return int
         */
        public function getRow()
        {
                return $this->_parent->getCurrentRow();
        }

        /**
         *      Get cell coordinate
         *
         *      @return string
         */
        public function getCoordinate()
        {
                return $this->_parent->getCurrentAddress();
        }

        /**
         *      Get cell value
         *
         *      @return mixed
         */
        public function getValue()
        {
                return $this->_value;
        }

        /**
         *      Get cell value with formatting
         *
         *      @return string
         */
        public function getFormattedValue()
        {
                return (string) PHPExcel_Style_NumberFormat::toFormattedString(
                                $this->getCalculatedValue(),
                                $this->getWorksheet()->getParent()->getCellXfByIndex($this->getXfIndex())
                                        ->getNumberFormat()->getFormatCode()
                        );
        }

        /**
         *      Set cell value
         *
         *      Sets the value for a cell, automatically determining the datatype using the value binder
         *
         *      @param  mixed   $pValue                                 Value
         *      @return PHPExcel_Cell
         *      @throws PHPExcel_Exception
         */
        public function setValue($pValue = NULL)
        {
                if (!self::getValueBinder()->bindValue($this, $pValue)) {
                        throw new PHPExcel_Exception("Value could not be bound to cell.");
                }
                return $this;
        }

        /**
         *      Set the value for a cell, with the explicit data type passed to the method (bypassing any use of the value binder)
         *
         *      @param  mixed   $pValue                 Value
         *      @param  string  $pDataType              Explicit data type
         *      @return PHPExcel_Cell
         *      @throws PHPExcel_Exception
         */
        public function setValueExplicit($pValue = NULL, $pDataType = PHPExcel_Cell_DataType::TYPE_STRING)
        {
                // set the value according to data type
                switch ($pDataType) {
                        case PHPExcel_Cell_DataType::TYPE_STRING2:
                                $pDataType = PHPExcel_Cell_DataType::TYPE_STRING;
                        case PHPExcel_Cell_DataType::TYPE_STRING:
                        case PHPExcel_Cell_DataType::TYPE_NULL:
                        case PHPExcel_Cell_DataType::TYPE_INLINE:
                                $this->_value = PHPExcel_Cell_DataType::checkString($pValue);
                                break;
                        case PHPExcel_Cell_DataType::TYPE_NUMERIC:
                                $this->_value = (float)$pValue;
                                break;
                        case PHPExcel_Cell_DataType::TYPE_FORMULA:
                                $this->_value = (string)$pValue;
                                break;
                        case PHPExcel_Cell_DataType::TYPE_BOOL:
                                $this->_value = (bool)$pValue;
                                break;
                        case PHPExcel_Cell_DataType::TYPE_ERROR:
                                $this->_value = PHPExcel_Cell_DataType::checkErrorCode($pValue);
                                break;
                        default:
                                throw new PHPExcel_Exception('Invalid datatype: ' . $pDataType);
                                break;
                }

                // set the datatype
                $this->_dataType = $pDataType;

                return $this->notifyCacheController();
        }

        /**
         *      Get calculated cell value
         *
         *      @deprecated             Since version 1.7.8 for planned changes to cell for array formula handling
         *
         *      @param  boolean $resetLog  Whether the calculation engine logger should be reset or not
         *      @return mixed
         *      @throws PHPExcel_Exception
         */
        public function getCalculatedValue($resetLog = TRUE)
        {
//echo 'Cell '.$this->getCoordinate().' value is a '.$this->_dataType.' with a value of '.$this->getValue().PHP_EOL;
                if ($this->_dataType == PHPExcel_Cell_DataType::TYPE_FORMULA) {
                        try {
//echo 'Cell value for '.$this->getCoordinate().' is a formula: Calculating value'.PHP_EOL;
                                $result = PHPExcel_Calculation::getInstance(
                                        $this->getWorksheet()->getParent()
                                )->calculateCellValue($this,$resetLog);
//echo $this->getCoordinate().' calculation result is '.$result.PHP_EOL;
                                //      We don't yet handle array returns
                                if (is_array($result)) {
                                        while (is_array($result)) {
                                                $result = array_pop($result);
                                        }
                                }
                        } catch ( PHPExcel_Exception $ex ) {
                                if (($ex->getMessage() === 'Unable to access External Workbook') && ($this->_calculatedValue !== NULL)) {
//echo 'Returning fallback value of '.$this->_calculatedValue.' for cell '.$this->getCoordinate().PHP_EOL;
                                        return $this->_calculatedValue; // Fallback for calculations referencing external files.
                                }
//echo 'Calculation Exception: '.$ex->getMessage().PHP_EOL;
                                $result = '#N/A';
                                throw new PHPExcel_Calculation_Exception(
                                        $this->getWorksheet()->getTitle().'!'.$this->getCoordinate().' -> '.$ex->getMessage()
                                );
                        }

                        if ($result === '#Not Yet Implemented') {
//echo 'Returning fallback value of '.$this->_calculatedValue.' for cell '.$this->getCoordinate().PHP_EOL;
                                return $this->_calculatedValue; // Fallback if calculation engine does not support the formula.
                        }
//echo 'Returning calculated value of '.$result.' for cell '.$this->getCoordinate().PHP_EOL;
                        return $result;
                } elseif($this->_value instanceof PHPExcel_RichText) {
//              echo 'Cell value for '.$this->getCoordinate().' is rich text: Returning data value of '.$this->_value.'<br />';
                        return $this->_value->getPlainText();
                }
//              echo 'Cell value for '.$this->getCoordinate().' is not a formula: Returning data value of '.$this->_value.'<br />';
                return $this->_value;
        }

        /**
         *      Set old calculated value (cached)
         *
         *      @param  mixed $pValue   Value
         *      @return PHPExcel_Cell
         */
        public function setCalculatedValue($pValue = NULL)
        {
                if ($pValue !== NULL) {
                        $this->_calculatedValue = (is_numeric($pValue)) ? (float) $pValue : $pValue;
                }

                return $this->notifyCacheController();
        }

        /**
         *      Get old calculated value (cached)
         *      This returns the value last calculated by MS Excel or whichever spreadsheet program was used to
         *              create the original spreadsheet file.
         *      Note that this value is not guaranteed to refelect the actual calculated value because it is
         *              possible that auto-calculation was disabled in the original spreadsheet, and underlying data
         *              values used by the formula have changed since it was last calculated.
         *
         *      @return mixed
         */
        public function getOldCalculatedValue()
        {
                return $this->_calculatedValue;
        }

        /**
         *      Get cell data type
         *
         *      @return string
         */
        public function getDataType()
        {
                return $this->_dataType;
        }

        /**
         *      Set cell data type
         *
         *      @param  string $pDataType
         *      @return PHPExcel_Cell
         */
        public function setDataType($pDataType = PHPExcel_Cell_DataType::TYPE_STRING)
        {
                if ($pDataType == PHPExcel_Cell_DataType::TYPE_STRING2)
                        $pDataType = PHPExcel_Cell_DataType::TYPE_STRING;

                $this->_dataType = $pDataType;

                return $this->notifyCacheController();
        }

        /**
         *      Does this cell contain Data validation rules?
         *
         *      @return boolean
         *      @throws PHPExcel_Exception
         */
        public function hasDataValidation()
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot check for data validation when cell is not bound to a worksheet');
                }

                return $this->getWorksheet()->dataValidationExists($this->getCoordinate());
        }

        /**
         *      Get Data validation rules
         *
         *      @return PHPExcel_Cell_DataValidation
         *      @throws PHPExcel_Exception
         */
        public function getDataValidation()
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot get data validation for cell that is not bound to a worksheet');
                }

                return $this->getWorksheet()->getDataValidation($this->getCoordinate());
        }

        /**
         *      Set Data validation rules
         *
         *      @param  PHPExcel_Cell_DataValidation    $pDataValidation
         *      @return PHPExcel_Cell
         *      @throws PHPExcel_Exception
         */
        public function setDataValidation(PHPExcel_Cell_DataValidation $pDataValidation = NULL)
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot set data validation for cell that is not bound to a worksheet');
                }

                $this->getWorksheet()->setDataValidation($this->getCoordinate(), $pDataValidation);

                return $this->notifyCacheController();
        }

        /**
         *      Does this cell contain a Hyperlink?
         *
         *      @return boolean
         *      @throws PHPExcel_Exception
         */
        public function hasHyperlink()
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot check for hyperlink when cell is not bound to a worksheet');
                }

                return $this->getWorksheet()->hyperlinkExists($this->getCoordinate());
        }

        /**
         *      Get Hyperlink
         *
         *      @return PHPExcel_Cell_Hyperlink
         *      @throws PHPExcel_Exception
         */
        public function getHyperlink()
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot get hyperlink for cell that is not bound to a worksheet');
                }

                return $this->getWorksheet()->getHyperlink($this->getCoordinate());
        }

        /**
         *      Set Hyperlink
         *
         *      @param  PHPExcel_Cell_Hyperlink $pHyperlink
         *      @return PHPExcel_Cell
         *      @throws PHPExcel_Exception
         */
        public function setHyperlink(PHPExcel_Cell_Hyperlink $pHyperlink = NULL)
        {
                if (!isset($this->_parent)) {
                        throw new PHPExcel_Exception('Cannot set hyperlink for cell that is not bound to a worksheet');
                }

                $this->getWorksheet()->setHyperlink($this->getCoordinate(), $pHyperlink);

                return $this->notifyCacheController();
        }

        /**
         *      Get parent worksheet
         *
         *      @return PHPExcel_Worksheet
         */
        public function getParent() {
                return $this->_parent;
        }

        /**
         *      Get parent worksheet
         *
         *      @return PHPExcel_Worksheet
         */
        public function getWorksheet() {
                return $this->_parent->getParent();
        }

        /**
         *      Get cell style
         *
         *      @return PHPExcel_Style
         */
        public function getStyle()
        {
                return $this->getWorksheet()->getParent()->getCellXfByIndex($this->getXfIndex());
        }

        /**
         *      Re-bind parent
         *
         *      @param  PHPExcel_Worksheet $parent
         *      @return PHPExcel_Cell
         */
        public function rebindParent(PHPExcel_Worksheet $parent) {
                $this->_parent = $parent->getCellCacheController();

                return $this->notifyCacheController();
        }

        /**
         *      Is cell in a specific range?
         *
         *      @param  string  $pRange         Cell range (e.g. A1:A1)
         *      @return boolean
         */
        public function isInRange($pRange = 'A1:A1')
        {
                list($rangeStart,$rangeEnd) = self::rangeBoundaries($pRange);

                // Translate properties
                $myColumn       = self::columnIndexFromString($this->getColumn());
                $myRow          = $this->getRow();

                // Verify if cell is in range
                return (($rangeStart[0] <= $myColumn) && ($rangeEnd[0] >= $myColumn) &&
                                ($rangeStart[1] <= $myRow) && ($rangeEnd[1] >= $myRow)
                           );
        }

        /**
         *      Coordinate from string
         *
         *      @param  string  $pCoordinateString
         *      @return array   Array containing column and row (indexes 0 and 1)
         *      @throws PHPExcel_Exception
         */
        public static function coordinateFromString($pCoordinateString = 'A1')
        {
                if (preg_match("/^([$]?[A-Z]{1,3})([$]?\d{1,7})$/", $pCoordinateString, $matches)) {
                        return array($matches[1],$matches[2]);
                } elseif ((strpos($pCoordinateString,':') !== FALSE) || (strpos($pCoordinateString,',') !== FALSE)) {
                        throw new PHPExcel_Exception('Cell coordinate string can not be a range of cells');
                } elseif ($pCoordinateString == '') {
                        throw new PHPExcel_Exception('Cell coordinate can not be zero-length string');
                }

                throw new PHPExcel_Exception('Invalid cell coordinate '.$pCoordinateString);
        }

        /**
         *      Make string row, column or cell coordinate absolute
         *
         *      @param  string  $pCoordinateString              e.g. 'A' or '1' or 'A1'
         *                                      Note that this value can be a row or column reference as well as a cell reference
         *      @return string  Absolute coordinate             e.g. '$A' or '$1' or '$A$1'
         *      @throws PHPExcel_Exception
         */
        public static function absoluteReference($pCoordinateString = 'A1')
        {
                if (strpos($pCoordinateString,':') === FALSE && strpos($pCoordinateString,',') === FALSE) {
                        // Split out any worksheet name from the reference
                        $worksheet = '';
                        $cellAddress = explode('!',$pCoordinateString);
                        if (count($cellAddress) > 1) {
                                list($worksheet,$pCoordinateString) = $cellAddress;
                        }
                        if ($worksheet > '')    $worksheet .= '!';

                        // Create absolute coordinate
                        if (ctype_digit($pCoordinateString)) {
                                return $worksheet . '$' . $pCoordinateString;
                        } elseif (ctype_alpha($pCoordinateString)) {
                                return $worksheet . '$' . strtoupper($pCoordinateString);
                        }
                        return $worksheet . self::absoluteCoordinate($pCoordinateString);
                }

                throw new PHPExcel_Exception('Cell coordinate string can not be a range of cells');
        }

        /**
         *      Make string coordinate absolute
         *
         *      @param  string  $pCoordinateString              e.g. 'A1'
         *      @return string  Absolute coordinate             e.g. '$A$1'
         *      @throws PHPExcel_Exception
         */
        public static function absoluteCoordinate($pCoordinateString = 'A1')
        {
                if (strpos($pCoordinateString,':') === FALSE && strpos($pCoordinateString,',') === FALSE) {
                        // Split out any worksheet name from the coordinate
                        $worksheet = '';
                        $cellAddress = explode('!',$pCoordinateString);
                        if (count($cellAddress) > 1) {
                                list($worksheet,$pCoordinateString) = $cellAddress;
                        }
                        if ($worksheet > '')    $worksheet .= '!';

                        // Create absolute coordinate
                        list($column, $row) = self::coordinateFromString($pCoordinateString);
                        $column = ltrim($column,'$');
                        $row = ltrim($row,'$');
                        return $worksheet . '$' . $column . '$' . $row;
                }

                throw new PHPExcel_Exception('Cell coordinate string can not be a range of cells');
        }

        /**
         *      Split range into coordinate strings
         *
         *      @param  string  $pRange         e.g. 'B4:D9' or 'B4:D9,H2:O11' or 'B4'
         *      @return array   Array containg one or more arrays containing one or two coordinate strings
         *                                                              e.g. array('B4','D9') or array(array('B4','D9'),array('H2','O11'))
         *                                                                              or array('B4')
         */
        public static function splitRange($pRange = 'A1:A1')
        {
                // Ensure $pRange is a valid range
                if(empty($pRange)) {
                        $pRange = self::DEFAULT_RANGE;
                }

                $exploded = explode(',', $pRange);
                $counter = count($exploded);
                for ($i = 0; $i < $counter; ++$i) {
                        $exploded[$i] = explode(':', $exploded[$i]);
                }
                return $exploded;
        }

        /**
         *      Build range from coordinate strings
         *
         *      @param  array   $pRange Array containg one or more arrays containing one or two coordinate strings
         *      @return string  String representation of $pRange
         *      @throws PHPExcel_Exception
         */
        public static function buildRange($pRange)
        {
                // Verify range
                if (!is_array($pRange) || empty($pRange) || !is_array($pRange[0])) {
                        throw new PHPExcel_Exception('Range does not contain any information');
                }

                // Build range
                $imploded = array();
                $counter = count($pRange);
                for ($i = 0; $i < $counter; ++$i) {
                        $pRange[$i] = implode(':', $pRange[$i]);
                }
                $imploded = implode(',', $pRange);

                return $imploded;
        }

        /**
         *      Calculate range boundaries
         *
         *      @param  string  $pRange         Cell range (e.g. A1:A1)
         *      @return array   Range coordinates array(Start Cell, End Cell)
         *                                      where Start Cell and End Cell are arrays (Column Number, Row Number)
         */
        public static function rangeBoundaries($pRange = 'A1:A1')
        {
                // Ensure $pRange is a valid range
                if(empty($pRange)) {
                        $pRange = self::DEFAULT_RANGE;
                }

                // Uppercase coordinate
                $pRange = strtoupper($pRange);

                // Extract range
                if (strpos($pRange, ':') === FALSE) {
                        $rangeA = $rangeB = $pRange;
                } else {
                        list($rangeA, $rangeB) = explode(':', $pRange);
                }

                // Calculate range outer borders
                $rangeStart = self::coordinateFromString($rangeA);
                $rangeEnd       = self::coordinateFromString($rangeB);

                // Translate column into index
                $rangeStart[0]  = self::columnIndexFromString($rangeStart[0]);
                $rangeEnd[0]    = self::columnIndexFromString($rangeEnd[0]);

                return array($rangeStart, $rangeEnd);
        }

        /**
         *      Calculate range dimension
         *
         *      @param  string  $pRange         Cell range (e.g. A1:A1)
         *      @return array   Range dimension (width, height)
         */
        public static function rangeDimension($pRange = 'A1:A1')
        {
                // Calculate range outer borders
                list($rangeStart,$rangeEnd) = self::rangeBoundaries($pRange);

                return array( ($rangeEnd[0] - $rangeStart[0] + 1), ($rangeEnd[1] - $rangeStart[1] + 1) );
        }

        /**
         *      Calculate range boundaries
         *
         *      @param  string  $pRange         Cell range (e.g. A1:A1)
         *      @return array   Range coordinates array(Start Cell, End Cell)
         *                                      where Start Cell and End Cell are arrays (Column ID, Row Number)
         */
        public static function getRangeBoundaries($pRange = 'A1:A1')
        {
                // Ensure $pRange is a valid range
                if(empty($pRange)) {
                        $pRange = self::DEFAULT_RANGE;
                }

                // Uppercase coordinate
                $pRange = strtoupper($pRange);

                // Extract range
                if (strpos($pRange, ':') === FALSE) {
                        $rangeA = $rangeB = $pRange;
                } else {
                        list($rangeA, $rangeB) = explode(':', $pRange);
                }

                return array( self::coordinateFromString($rangeA), self::coordinateFromString($rangeB));
        }

        /**
         *      Column index from string
         *
         *      @param  string $pString
         *      @return int Column index (base 1 !!!)
         */
        public static function columnIndexFromString($pString = 'A')
        {
                //      Using a lookup cache adds a slight memory overhead, but boosts speed
                //      caching using a static within the method is faster than a class static,
                //              though it's additional memory overhead
                static $_indexCache = array();

                if (isset($_indexCache[$pString]))
                        return $_indexCache[$pString];

                //      It's surprising how costly the strtoupper() and ord() calls actually are, so we use a lookup array rather than use ord()
                //              and make it case insensitive to get rid of the strtoupper() as well. Because it's a static, there's no significant
                //              memory overhead either
                static $_columnLookup = array(
                        'A' => 1, 'B' => 2, 'C' => 3, 'D' => 4, 'E' => 5, 'F' => 6, 'G' => 7, 'H' => 8, 'I' => 9, 'J' => 10, 'K' => 11, 'L' => 12, 'M' => 13,
                        'N' => 14, 'O' => 15, 'P' => 16, 'Q' => 17, 'R' => 18, 'S' => 19, 'T' => 20, 'U' => 21, 'V' => 22, 'W' => 23, 'X' => 24, 'Y' => 25, 'Z' => 26,
                        'a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5, 'f' => 6, 'g' => 7, 'h' => 8, 'i' => 9, 'j' => 10, 'k' => 11, 'l' => 12, 'm' => 13,
                        'n' => 14, 'o' => 15, 'p' => 16, 'q' => 17, 'r' => 18, 's' => 19, 't' => 20, 'u' => 21, 'v' => 22, 'w' => 23, 'x' => 24, 'y' => 25, 'z' => 26
                );

                //      We also use the language construct isset() rather than the more costly strlen() function to match the length of $pString
                //              for improved performance
                if (isset($pString{0})) {
                        if (!isset($pString{1})) {
                                $_indexCache[$pString] = $_columnLookup[$pString];
                                return $_indexCache[$pString];
                        } elseif(!isset($pString{2})) {
                                $_indexCache[$pString] = $_columnLookup[$pString{0}] * 26 + $_columnLookup[$pString{1}];
                                return $_indexCache[$pString];
                        } elseif(!isset($pString{3})) {
                                $_indexCache[$pString] = $_columnLookup[$pString{0}] * 676 + $_columnLookup[$pString{1}] * 26 + $_columnLookup[$pString{2}];
                                return $_indexCache[$pString];
                        }
                }
                throw new PHPExcel_Exception("Column string index can not be " . ((isset($pString{0})) ? "longer than 3 characters" : "empty"));
        }

        /**
         *      String from columnindex
         *
         *      @param  int $pColumnIndex Column index (base 0 !!!)
         *      @return string
         */
        public static function stringFromColumnIndex($pColumnIndex = 0)
        {
                //      Using a lookup cache adds a slight memory overhead, but boosts speed
                //      caching using a static within the method is faster than a class static,
                //              though it's additional memory overhead
                static $_indexCache = array();

                if (!isset($_indexCache[$pColumnIndex])) {
                        // Determine column string
                        if ($pColumnIndex < 26) {
                                $_indexCache[$pColumnIndex] = chr(65 + $pColumnIndex);
                        } elseif ($pColumnIndex < 702) {
                                $_indexCache[$pColumnIndex] = chr(64 + ($pColumnIndex / 26)) .
                                                                                          chr(65 + $pColumnIndex % 26);
                        } else {
                                $_indexCache[$pColumnIndex] = chr(64 + (($pColumnIndex - 26) / 676)) .
                                                                                          chr(65 + ((($pColumnIndex - 26) % 676) / 26)) .
                                                                                          chr(65 + $pColumnIndex % 26);
                        }
                }
                return $_indexCache[$pColumnIndex];
        }

        /**
         *      Extract all cell references in range
         *
         *      @param  string  $pRange         Range (e.g. A1 or A1:C10 or A1:E10 A20:E25)
         *      @return array   Array containing single cell references
         */
        public static function extractAllCellReferencesInRange($pRange = 'A1') {
                // Returnvalue
                $returnValue = array();

                // Explode spaces
                $cellBlocks = explode(' ', str_replace('$', '', strtoupper($pRange)));
                foreach ($cellBlocks as $cellBlock) {
                        // Single cell?
                        if (strpos($cellBlock,':') === FALSE && strpos($cellBlock,',') === FALSE) {
                                $returnValue[] = $cellBlock;
                                continue;
                        }

                        // Range...
                        $ranges = self::splitRange($cellBlock);
                        foreach($ranges as $range) {
                                // Single cell?
                                if (!isset($range[1])) {
                                        $returnValue[] = $range[0];
                                        continue;
                                }

                                // Range...
                                list($rangeStart, $rangeEnd)    = $range;
                                sscanf($rangeStart,'%[A-Z]%d', $startCol, $startRow);
                                sscanf($rangeEnd,'%[A-Z]%d', $endCol, $endRow);
                                $endCol++;

                                // Current data
                                $currentCol     = $startCol;
                                $currentRow     = $startRow;

                                // Loop cells
                                while ($currentCol != $endCol) {
                                        while ($currentRow <= $endRow) {
                                                $returnValue[] = $currentCol.$currentRow;
                                                ++$currentRow;
                                        }
                                        ++$currentCol;
                                        $currentRow = $startRow;
                                }
                        }
                }

                //      Sort the result by column and row
                $sortKeys = array();
                foreach (array_unique($returnValue) as $coord) {
                        sscanf($coord,'%[A-Z]%d', $column, $row);
                        $sortKeys[sprintf('%3s%09d',$column,$row)] = $coord;
                }
                ksort($sortKeys);

                // Return value
                return array_values($sortKeys);
        }

        /**
         * Compare 2 cells
         *
         * @param       PHPExcel_Cell   $a      Cell a
         * @param       PHPExcel_Cell   $b      Cell b
         * @return      int             Result of comparison (always -1 or 1, never zero!)
         */
        public static function compareCells(PHPExcel_Cell $a, PHPExcel_Cell $b)
        {
                if ($a->getRow() < $b->getRow()) {
                        return -1;
                } elseif ($a->getRow() > $b->getRow()) {
                        return 1;
                } elseif (self::columnIndexFromString($a->getColumn()) < self::columnIndexFromString($b->getColumn())) {
                        return -1;
                } else {
                        return 1;
                }
        }

        /**
         * Get value binder to use
         *
         * @return PHPExcel_Cell_IValueBinder
         */
        public static function getValueBinder() {
                if (self::$_valueBinder === NULL) {
                        self::$_valueBinder = new PHPExcel_Cell_DefaultValueBinder();
                }

                return self::$_valueBinder;
        }

        /**
         * Set value binder to use
         *
         * @param PHPExcel_Cell_IValueBinder $binder
         * @throws PHPExcel_Exception
         */
        public static function setValueBinder(PHPExcel_Cell_IValueBinder $binder = NULL) {
                if ($binder === NULL) {
                        throw new PHPExcel_Exception("A PHPExcel_Cell_IValueBinder is required for PHPExcel to function correctly.");
                }

                self::$_valueBinder = $binder;
        }

        /**
         * Implement PHP __clone to create a deep clone, not just a shallow copy.
         */
        public function __clone() {
                $vars = get_object_vars($this);
                foreach ($vars as $key => $value) {
                        if ((is_object($value)) && ($key != '_parent')) {
                                $this->$key = clone $value;
                        } else {
                                $this->$key = $value;
                        }
                }
        }

        /**
         * Get index to cellXf
         *
         * @return int
         */
        public function getXfIndex()
        {
                return $this->_xfIndex;
        }

        /**
         * Set index to cellXf
         *
         * @param int $pValue
         * @return PHPExcel_Cell
         */
        public function setXfIndex($pValue = 0)
        {
                $this->_xfIndex = $pValue;

                return $this->notifyCacheController();
        }

        /**
         *      @deprecated             Since version 1.7.8 for planned changes to cell for array formula handling
         */
        public function setFormulaAttributes($pAttributes)
        {
                $this->_formulaAttributes = $pAttributes;
                return $this;
        }

        /**
         *      @deprecated             Since version 1.7.8 for planned changes to cell for array formula handling
         */
        public function getFormulaAttributes()
        {
                return $this->_formulaAttributes;
        }

    /**
     * Convert to string
     *
     * @return string
     */
        public function __toString()
        {
                return (string) $this->getValue();
        }

}