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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 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_Reader
 * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version 1.8.0, 2014-03-02
 */

/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
	/**
	 * @ignore
	 */
	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

/**
 * PHPExcel_Reader_HTML
 *
 * @category   PHPExcel
 * @package    PHPExcel_Reader
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Reader_HTML extends PHPExcel_Reader_Abstract implements PHPExcel_Reader_IReader
{
	/**
	 * Input encoding
	 *
	 * @var string
	 */
	private $_inputEncoding	= 'ANSI';

/**
	 * Sheet index to read
	 *
	 * @var int
	 */
	private $_sheetIndex 	= 0;

/**
	 * Formats
	 *
	 * @var array
	 */
	private $_formats = array( 'h1' => array( 'font' => array( 'bold' => true,
															   'size' => 24,
															 ),
											),	//	Bold, 24pt
							   'h2' => array( 'font' => array( 'bold' => true,
															   'size' => 18,
															 ),
											),	//	Bold, 18pt
							   'h3' => array( 'font' => array( 'bold' => true,
															   'size' => 13.5,
															 ),
											),	//	Bold, 13.5pt
							   'h4' => array( 'font' => array( 'bold' => true,
															   'size' => 12,
															 ),
											),	//	Bold, 12pt
							   'h5' => array( 'font' => array( 'bold' => true,
															   'size' => 10,
															 ),
											),	//	Bold, 10pt
							   'h6' => array( 'font' => array( 'bold' => true,
															   'size' => 7.5,
															 ),
											),	//	Bold, 7.5pt
							   'a'  => array( 'font' => array( 'underline' => true,
															   'color' => array( 'argb' => PHPExcel_Style_Color::COLOR_BLUE,
															                   ),
															 ),
											),	//	Blue underlined
							   'hr' => array( 'borders' => array( 'bottom' => array( 'style' => PHPExcel_Style_Border::BORDER_THIN,
																					 'color' => array( PHPExcel_Style_Color::COLOR_BLACK,
																					                 ),
																				   ),
																),
											),	//	Bottom border
							 );

/**
	 * Create a new PHPExcel_Reader_HTML
	 */
	public function __construct() {
		$this->_readFilter 	= new PHPExcel_Reader_DefaultReadFilter();
	}

/**
	 * Validate that the current file is an HTML file
	 *
	 * @return boolean
	 */
	protected function _isValidFormat()
	{
		//	Reading 2048 bytes should be enough to validate that the format is HTML
		$data = fread($this->_fileHandle, 2048);
		if ((strpos($data, '<') !== FALSE) &&
			(strlen($data) !== strlen(strip_tags($data)))) {
			return TRUE;
		}

return FALSE;
	}

/**
	 * Loads PHPExcel from file
	 *
	 * @param 	string 		$pFilename
	 * @return 	PHPExcel
	 * @throws 	PHPExcel_Reader_Exception
	 */
	public function load($pFilename)
	{
		// Create new PHPExcel
		$objPHPExcel = new PHPExcel();

// Load into this instance
		return $this->loadIntoExisting($pFilename, $objPHPExcel);
	}

/**
	 * Set input encoding
	 *
	 * @param string $pValue Input encoding
	 */
	public function setInputEncoding($pValue = 'ANSI')
	{
		$this->_inputEncoding = $pValue;
		return $this;
	}

/**
	 * Get input encoding
	 *
	 * @return string
	 */
	public function getInputEncoding()
	{
		return $this->_inputEncoding;
	}

//	Data Array used for testing only, should write to PHPExcel object on completion of tests
	private $_dataArray = array();

private $_tableLevel = 0;
	private $_nestedColumn = array('A');

private function _setTableStartColumn($column) {
		if ($this->_tableLevel == 0)
			$column = 'A';
		++$this->_tableLevel;
		$this->_nestedColumn[$this->_tableLevel] = $column;

return $this->_nestedColumn[$this->_tableLevel];
	}

private function _getTableStartColumn() {
		return $this->_nestedColumn[$this->_tableLevel];
	}

private function _releaseTableStartColumn() {
		--$this->_tableLevel;
		return array_pop($this->_nestedColumn);
	}

private function _flushCell($sheet,$column,$row,&$cellContent) {
		if (is_string($cellContent)) {
			//	Simple String content
			if (trim($cellContent) > '') {
				//	Only actually write it if there's content in the string
//				echo 'FLUSH CELL: ' , $column , $row , ' => ' , $cellContent , ' ';
				//	Write to worksheet to be done here...
				//	... we return the cell so we can mess about with styles more easily
				$cell = $sheet->setCellValue($column.$row,$cellContent,true);
				$this->_dataArray[$row][$column] = $cellContent;
			}
		} else {
			//	We have a Rich Text run
			//	TODO
			$this->_dataArray[$row][$column] = 'RICH TEXT: ' . $cellContent;
		}
		$cellContent = (string) '';
	}

private function _processDomElement(DOMNode $element, $sheet, &$row, &$column, &$cellContent){
		foreach($element->childNodes as $child){
			if ($child instanceof DOMText) {
				$domText = preg_replace('/\s+/',' ',trim($child->nodeValue));
				if (is_string($cellContent)) {
					//	simply append the text if the cell content is a plain text string
					$cellContent .= $domText;
				} else {
					//	but if we have a rich text run instead, we need to append it correctly
					//	TODO
				}
			} elseif($child instanceof DOMElement) {
//				echo 'DOM ELEMENT: ' , strtoupper($child->nodeName) , ' ';

$attributeArray = array();
				foreach($child->attributes as $attribute) {
//					echo 'ATTRIBUTE: ' , $attribute->name , ' => ' , $attribute->value , ' ';
					$attributeArray[$attribute->name] = $attribute->value;
				}

switch($child->nodeName) {
					case 'meta' :
						foreach($attributeArray as $attributeName => $attributeValue) {
							switch($attributeName) {
								case 'content':
									//	TODO
									//	Extract character set, so we can convert to UTF-8 if required
									break;
							}
						}
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
						break;
					case 'title' :
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
						$sheet->setTitle($cellContent);
						$cellContent = '';
						break;
					case 'span' :
					case 'div' :
					case 'font' :
					case 'i' :
					case 'em' :
					case 'strong':
					case 'b' :
//						echo 'STYLING, SPAN OR DIV ';
						if ($cellContent > '')
							$cellContent .= ' ';
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
						if ($cellContent > '')
							$cellContent .= ' ';
//						echo 'END OF STYLING, SPAN OR DIV ';
						break;
					case 'hr' :
						$this->_flushCell($sheet,$column,$row,$cellContent);
						++$row;
						if (isset($this->_formats[$child->nodeName])) {
							$sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
						} else {
							$cellContent = '----------';
							$this->_flushCell($sheet,$column,$row,$cellContent);
						}
						++$row;
					case 'br' :
						if ($this->_tableLevel > 0) {
							//	If we're inside a table, replace with a \n
							$cellContent .= "\n";
						} else {
							//	Otherwise flush our existing content and move the row cursor on
							$this->_flushCell($sheet,$column,$row,$cellContent);
							++$row;
						}
//						echo 'HARD LINE BREAK: ' , ' ';
						break;
					case 'a' :
//						echo 'START OF HYPERLINK: ' , ' ';
						foreach($attributeArray as $attributeName => $attributeValue) {
							switch($attributeName) {
								case 'href':
//									echo 'Link to ' , $attributeValue , ' ';
									$sheet->getCell($column.$row)->getHyperlink()->setUrl($attributeValue);
									if (isset($this->_formats[$child->nodeName])) {
										$sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
									}
									break;
							}
						}
						$cellContent .= ' ';
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//						echo 'END OF HYPERLINK:' , ' ';
						break;
					case 'h1' :
					case 'h2' :
					case 'h3' :
					case 'h4' :
					case 'h5' :
					case 'h6' :
					case 'ol' :
					case 'ul' :
					case 'p' :
						if ($this->_tableLevel > 0) {
							//	If we're inside a table, replace with a \n
							$cellContent .= "\n";
//							echo 'LIST ENTRY: ' , ' ';
							$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//							echo 'END OF LIST ENTRY:' , ' ';
						} else {
							if ($cellContent > '') {
								$this->_flushCell($sheet,$column,$row,$cellContent);
								$row += 2;
							}
//							echo 'START OF PARAGRAPH: ' , ' ';
							$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//							echo 'END OF PARAGRAPH:' , ' ';
							$this->_flushCell($sheet,$column,$row,$cellContent);

if (isset($this->_formats[$child->nodeName])) {
								$sheet->getStyle($column.$row)->applyFromArray($this->_formats[$child->nodeName]);
							}

$row += 2;
							$column = 'A';
						}
						break;
					case 'li' :
						if ($this->_tableLevel > 0) {
							//	If we're inside a table, replace with a \n
							$cellContent .= "\n";
//							echo 'LIST ENTRY: ' , ' ';
							$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//							echo 'END OF LIST ENTRY:' , ' ';
						} else {
							if ($cellContent > '') {
								$this->_flushCell($sheet,$column,$row,$cellContent);
							}
							++$row;
//							echo 'LIST ENTRY: ' , ' ';
							$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//							echo 'END OF LIST ENTRY:' , ' ';
							$this->_flushCell($sheet,$column,$row,$cellContent);
							$column = 'A';
						}
						break;
					case 'table' :
						$this->_flushCell($sheet,$column,$row,$cellContent);
						$column = $this->_setTableStartColumn($column);
//						echo 'START OF TABLE LEVEL ' , $this->_tableLevel , ' ';
						if ($this->_tableLevel > 1)
							--$row;
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//						echo 'END OF TABLE LEVEL ' , $this->_tableLevel , ' ';
						$column = $this->_releaseTableStartColumn();
						if ($this->_tableLevel > 1) {
							++$column;
						} else {
							++$row;
						}
						break;
					case 'thead' :
					case 'tbody' :
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
						break;
					case 'tr' :
						++$row;
						$column = $this->_getTableStartColumn();
						$cellContent = '';
//						echo 'START OF TABLE ' , $this->_tableLevel , ' ROW ';
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//						echo 'END OF TABLE ' , $this->_tableLevel , ' ROW ';
						break;
					case 'th' :
					case 'td' :
//						echo 'START OF TABLE ' , $this->_tableLevel , ' CELL ';
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
//						echo 'END OF TABLE ' , $this->_tableLevel , ' CELL ';
						$this->_flushCell($sheet,$column,$row,$cellContent);
						++$column;
						break;
					case 'body' :
						$row = 1;
						$column = 'A';
						$content = '';
						$this->_tableLevel = 0;
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
						break;
					default:
						$this->_processDomElement($child,$sheet,$row,$column,$cellContent);
				}
			}
		}
	}

/**
	 * Loads PHPExcel from file into PHPExcel instance
	 *
	 * @param 	string 		$pFilename
	 * @param	PHPExcel	$objPHPExcel
	 * @return 	PHPExcel
	 * @throws 	PHPExcel_Reader_Exception
	 */
	public function loadIntoExisting($pFilename, PHPExcel $objPHPExcel)
	{
		// Open file to validate
		$this->_openFile($pFilename);
		if (!$this->_isValidFormat()) {
			fclose ($this->_fileHandle);
			throw new PHPExcel_Reader_Exception($pFilename . " is an Invalid HTML file.");
		}
		//	Close after validating
		fclose ($this->_fileHandle);

// Create new PHPExcel
		while ($objPHPExcel->getSheetCount() <= $this->_sheetIndex) {
			$objPHPExcel->createSheet();
		}
		$objPHPExcel->setActiveSheetIndex( $this->_sheetIndex );

//	Create a new DOM object
		$dom = new domDocument;
		//	Reload the HTML file into the DOM object
		$loaded = $dom->loadHTMLFile($pFilename, PHPExcel_Settings::getLibXmlLoaderOptions());
		if ($loaded === FALSE) {
			throw new PHPExcel_Reader_Exception('Failed to load ',$pFilename,' as a DOM Document');
		}

//	Discard white space
		$dom->preserveWhiteSpace = false;

$row = 0;
		$column = 'A';
		$content = '';
		$this->_processDomElement($dom,$objPHPExcel->getActiveSheet(),$row,$column,$content);

//		echo '<hr />';
//		var_dump($this->_dataArray);

// Return
		return $objPHPExcel;
	}

/**
	 * Get sheet index
	 *
	 * @return int
	 */
	public function getSheetIndex() {
		return $this->_sheetIndex;
	}

/**
	 * Set sheet index
	 *
	 * @param	int		$pValue		Sheet index
	 * @return PHPExcel_Reader_HTML
	 */
	public function setSheetIndex($pValue = 0) {
		$this->_sheetIndex = $pValue;
		return $this;
	}

}

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