<?php

use SimpleXMLElement;

/**
 *    SimpleXLSX php class
 *    MS Excel 2007+ workbooks reader
 *
 * Copyright (c) 2012 - 2022 SimpleXLSX
 *
 * @category   SimpleXLSX
 * @package    SimpleXLSX
 * @copyright  Copyright (c) 2012 - 2022 SimpleXLSX (https://github.com/shuchkin/simplexlsx/)
 * @license    MIT
 */

/** Examples
 *
 * use Shuchkin\SimpleXLSX;
 *
 * Example 1:
 * if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
 *   foreach ($xlsx->rows() as $r) {
 *     print_r( $r );
 *   }
 * } else {
 *   echo SimpleXLSX::parseError();
 * }
 *
 * Example 2: html table
 * if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
 *   echo $xlsx->toHTML();
 * } else {
 *   echo SimpleXLSX::parseError();
 * }
 *
 * Example 3: rowsEx
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * foreach ( $xlsx->rowsEx() as $r ) {
 *   print_r( $r );
 * }
 *
 * Example 4: select worksheet
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * foreach( $xlsx->rows(1) as $r  ) { // second worksheet
 *   print_t( $r );
 * }
 *
 * Example 5: IDs and worksheet names
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * print_r( $xlsx->sheetNames() ); // array( 0 => 'Sheet 1', 1 => 'Catalog' );
 *
 * Example 6: get sheet name by index
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * echo 'Sheet Name 2 = '.$xlsx->sheetName(1);
 *
 * Example 7: getCell (very slow)
 * echo $xlsx->getCell(1,'D12'); // reads D12 cell from second sheet
 *
 * Example 8: read data
 * if ( $xlsx = SimpleXLSX::parseData( file_get_contents('http://www.example.com/example.xlsx') ) ) {
 *   $dim = $xlsx->dimension(1);
 *   $num_cols = $dim[0];
 *   $num_rows = $dim[1];
 *   echo $xlsx->sheetName(1).':'.$num_cols.'x'.$num_rows;
 * } else {
 *   echo SimpleXLSX::parseError();
 * }
 *
 * Example 9: old style
 * $xlsx = new SimpleXLSX('book.xlsx');
 * if ( $xlsx->success() ) {
 *   print_r( $xlsx->rows() );
 * } else {
 *   echo 'xlsx error: '.$xlsx->error();
 * }
 */
class SimpleXLSX
{
    // Don't remove this string! Created by Sergey Shuchkin sergey.shuchkin@gmail.com
    public static $CF = [ // Cell formats
        0 => 'General',
        1 => '0',
        2 => '0.00',
        3 => '#,##0',
        4 => '#,##0.00',
        9 => '0%',
        10 => '0.00%',
        11 => '0.00E+00',
        12 => '# ?/?',
        13 => '# ??/??',
        14 => 'mm-dd-yy',
        15 => 'd-mmm-yy',
        16 => 'd-mmm',
        17 => 'mmm-yy',
        18 => 'h:mm AM/PM',
        19 => 'h:mm:ss AM/PM',
        20 => 'h:mm',
        21 => 'h:mm:ss',
        22 => 'm/d/yy h:mm',

        37 => '#,##0 ;(#,##0)',
        38 => '#,##0 ;[Red](#,##0)',
        39 => '#,##0.00;(#,##0.00)',
        40 => '#,##0.00;[Red](#,##0.00)',

        44 => '_("$"* #,##0.00_);_("$"* \(#,##0.00\);_("$"* "-"??_);_(@_)',
        45 => 'mm:ss',
        46 => '[h]:mm:ss',
        47 => 'mmss.0',
        48 => '##0.0E+0',
        49 => '@',

        27 => '[$-404]e/m/d',
        30 => 'm/d/yy',
        36 => '[$-404]e/m/d',
        50 => '[$-404]e/m/d',
        57 => '[$-404]e/m/d',

        59 => 't0',
        60 => 't0.00',
        61 => 't#,##0',
        62 => 't#,##0.00',
        67 => 't0%',
        68 => 't0.00%',
        69 => 't# ?/?',
        70 => 't# ??/??',
    ];
    public $nf = []; // number formats
    public $cellFormats = []; // cellXfs
    public $datetimeFormat = 'Y-m-d H:i:s';
    public $debug;
    public $activeSheet = 0;
    public $rowsExReader;

    /* @var SimpleXMLElement[] $sheets */
    protected $sheets;
    protected $sheetNames = [];
    protected $sheetFiles = [];
    // scheme
    public $styles;
    protected $hyperlinks;
    /* @var array[] $package */
    protected $package;
    protected $sharedstrings;
    protected $date1904 = 0;


    /*
        private $date_formats = array(
            0xe => "d/m/Y",
            0xf => "d-M-Y",
            0x10 => "d-M",
            0x11 => "M-Y",
            0x12 => "h:i a",
            0x13 => "h:i:s a",
            0x14 => "H:i",
            0x15 => "H:i:s",
            0x16 => "d/m/Y H:i",
            0x2d => "i:s",
            0x2e => "H:i:s",
            0x2f => "i:s.S"
        );
        private $number_formats = array(
            0x1 => "%1.0f",     // "0"
            0x2 => "%1.2f",     // "0.00",
            0x3 => "%1.0f",     //"#,##0",
            0x4 => "%1.2f",     //"#,##0.00",
            0x5 => "%1.0f",     //"$#,##0;($#,##0)",
            0x6 => '$%1.0f',    //"$#,##0;($#,##0)",
            0x7 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
            0x8 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
            0x9 => '%1.0f%%',   //"0%"
            0xa => '%1.2f%%',   //"0.00%"
            0xb => '%1.2f',     //"0.00E00",
            0x25 => '%1.0f',    //"#,##0;(#,##0)",
            0x26 => '%1.0f',    //"#,##0;(#,##0)",
            0x27 => '%1.2f',    //"#,##0.00;(#,##0.00)",
            0x28 => '%1.2f',    //"#,##0.00;(#,##0.00)",
            0x29 => '%1.0f',    //"#,##0;(#,##0)",
            0x2a => '$%1.0f',   //"$#,##0;($#,##0)",
            0x2b => '%1.2f',    //"#,##0.00;(#,##0.00)",
            0x2c => '$%1.2f',   //"$#,##0.00;($#,##0.00)",
            0x30 => '%1.0f');   //"##0.0E0";
        // }}}
    */
    protected $errno = 0;
    protected $error = false;
    /**
     * @var false|SimpleXMLElement
     */
    public $theme;


    public function __construct($filename = null, $is_data = null, $debug = null)
    {
        if ($debug !== null) {
            $this->debug = $debug;
        }
        $this->package = [
            'filename' => '',
            'mtime' => 0,
            'size' => 0,
            'comment' => '',
            'entries' => []
        ];
        if ($filename && $this->_unzip($filename, $is_data)) {
            $this->_parse();
        }
    }

    protected function _unzip($filename, $is_data = false)
    {

        if ($is_data) {
            $this->package['filename'] = 'default.xlsx';
            $this->package['mtime'] = time();
            $this->package['size'] = $this->_strlen($filename);

            $vZ = $filename;
        } else {
            if (!is_readable($filename)) {
                $this->error(1, 'File not found ' . $filename);

                return false;
            }

            // Package information
            $this->package['filename'] = $filename;
            $this->package['mtime'] = filemtime($filename);
            $this->package['size'] = filesize($filename);

            // Read file
            $vZ = file_get_contents($filename);
        }
        // Cut end of central directory
        /*      $aE = explode("\x50\x4b\x05\x06", $vZ);

                if (count($aE) == 1) {
                    $this->error('Unknown format');
                    return false;
                }
        */
        // Explode to each part
        $aE = explode("\x50\x4b\x03\x04", $vZ);
        array_shift($aE);

        $aEL = count($aE);
        if ($aEL === 0) {
            $this->error(2, 'Unknown archive format');

            return false;
        }
        // Search central directory end record
        $last = $aE[$aEL - 1];
        $last = explode("\x50\x4b\x05\x06", $last);
        if (count($last) !== 2) {
            $this->error(2, 'Unknown archive format');

            return false;
        }
        // Search central directory
        $last = explode("\x50\x4b\x01\x02", $last[0]);
        if (count($last) < 2) {
            $this->error(2, 'Unknown archive format');

            return false;
        }
        $aE[$aEL - 1] = $last[0];

        // Loop through the entries
        foreach ($aE as $vZ) {
            $aI = [];
            $aI['E'] = 0;
            $aI['EM'] = '';
            // Retrieving local file header information
//          $aP = unpack('v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL', $vZ);
            $aP = unpack('v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL/v1EFL', $vZ);

            // Check if data is encrypted
//          $bE = ($aP['GPF'] && 0x0001) ? TRUE : FALSE;
//          $bE = false;
            $nF = $aP['FNL'];
            $mF = $aP['EFL'];

            // Special case : value block after the compressed data
            if ($aP['GPF'] & 0x0008) {
                $aP1 = unpack('V1CRC/V1CS/V1UCS', $this->_substr($vZ, -12));

                $aP['CRC'] = $aP1['CRC'];
                $aP['CS'] = $aP1['CS'];
                $aP['UCS'] = $aP1['UCS'];
                // 2013-08-10
                $vZ = $this->_substr($vZ, 0, -12);
                if ($this->_substr($vZ, -4) === "\x50\x4b\x07\x08") {
                    $vZ = $this->_substr($vZ, 0, -4);
                }
            }

            // Getting stored filename
            $aI['N'] = $this->_substr($vZ, 26, $nF);
            $aI['N'] = str_replace('\\', '/', $aI['N']);

            if ($this->_substr($aI['N'], -1) === '/') {
                // is a directory entry - will be skipped
                continue;
            }

            // Truncate full filename in path and filename
            $aI['P'] = dirname($aI['N']);
            $aI['P'] = ($aI['P'] === '.') ? '' : $aI['P'];
            $aI['N'] = basename($aI['N']);

            $vZ = $this->_substr($vZ, 26 + $nF + $mF);

            if ($this->_strlen($vZ) !== (int)$aP['CS']) { // check only if availabled
                $aI['E'] = 1;
                $aI['EM'] = 'Compressed size is not equal with the value in header information.';
            }
//          } elseif ( $bE ) {
//              $aI['E']  = 5;
//              $aI['EM'] = 'File is encrypted, which is not supported from this class.';
            /*            } else {
                            switch ($aP['CM']) {
                                case 0: // Stored
                                    // Here is nothing to do, the file ist flat.
                                    break;
                                case 8: // Deflated
                                    $vZ = gzinflate($vZ);
                                    break;
                                case 12: // BZIP2
                                    if (extension_loaded('bz2')) {
                                        $vZ = bzdecompress($vZ);
                                    } else {
                                        $aI['E'] = 7;
                                        $aI['EM'] = 'PHP BZIP2 extension not available.';
                                    }
                                    break;
                                default:
                                    $aI['E'] = 6;
                                    $aI['EM'] = "De-/Compression method {$aP['CM']} is not supported.";
                            }
                            if (!$aI['E']) {
                                if ($vZ === false) {
                                    $aI['E'] = 2;
                                    $aI['EM'] = 'Decompression of data failed.';
                                } elseif ($this->_strlen($vZ) !== (int)$aP['UCS']) {
                                    $aI['E'] = 3;
                                    $aI['EM'] = 'Uncompressed size is not equal with the value in header information.';
                                } elseif (crc32($vZ) !== $aP['CRC']) {
                                    $aI['E'] = 4;
                                    $aI['EM'] = 'CRC32 checksum is not equal with the value in header information.';
                                }
                            }
                        }
            */

            // DOS to UNIX timestamp
            $aI['T'] = mktime(
                ($aP['FT'] & 0xf800) >> 11,
                ($aP['FT'] & 0x07e0) >> 5,
                ($aP['FT'] & 0x001f) << 1,
                ($aP['FD'] & 0x01e0) >> 5,
                $aP['FD'] & 0x001f,
                (($aP['FD'] & 0xfe00) >> 9) + 1980
            );

            $this->package['entries'][] = [
                'data' => $vZ,
                'ucs' => (int)$aP['UCS'], // ucompresses size
                'cm' => $aP['CM'], // compressed method
                'cs' => isset($aP['CS']) ? (int) $aP['CS'] : 0, // compresses size
                'crc' => $aP['CRC'],
                'error' => $aI['E'],
                'error_msg' => $aI['EM'],
                'name' => $aI['N'],
                'path' => $aI['P'],
                'time' => $aI['T']
            ];
        } // end for each entries

        return true;
    }

    protected function _strlen($str)
    {
        return (ini_get('mbstring.func_overload') & 2) ? mb_strlen($str, '8bit') : strlen($str);
    }

    public function error($num = null, $str = null)
    {
        if ($num) {
            $this->errno = $num;
            $this->error = $str;
            if ($this->debug) {
                trigger_error(__CLASS__ . ': ' . $this->error, E_USER_WARNING);
            }
        }

        return $this->error;
    }

    protected function _substr($str, $start, $length = null)
    {
        return (ini_get('mbstring.func_overload') & 2) ? mb_substr($str, $start, ($length === null) ? mb_strlen($str, '8bit') : $length, '8bit') : substr($str, $start, ($length === null) ? strlen($str) : $length);
    }

    protected function _parse()
    {
        // Document data holders
        $this->sharedstrings = [];
        $this->sheets = [];
//      $this->styles = array();
//        $m1 = 0; // memory_get_peak_usage( true );
        // Read relations and search for officeDocument
        if ($relations = $this->getEntryXML('_rels/.rels')) {
            foreach ($relations->Relationship as $rel) {
                $rel_type = basename(trim((string)$rel['Type'])); // officeDocument
                $rel_target = $this->_getTarget('', (string)$rel['Target']); // /xl/workbook.xml or xl/workbook.xml

                if ($rel_type === 'officeDocument' && $workbook = $this->getEntryXML($rel_target)) {
                    $index_rId = []; // [0 => rId1]

                    $index = 0;
                    foreach ($workbook->sheets->sheet as $s) {
                        $this->sheetNames[$index] = (string)$s['name'];
                        $index_rId[$index] = (string)$s['id'];
                        $index++;
                    }
                    if ((int)$workbook->workbookPr['date1904'] === 1) {
                        $this->date1904 = 1;
                    }


                    if ($workbookRelations = $this->getEntryXML(dirname($rel_target) . '/_rels/workbook.xml.rels')) {
                        // Loop relations for workbook and extract sheets...
                        foreach ($workbookRelations->Relationship as $workbookRelation) {
                            $wrel_type = basename(trim((string)$workbookRelation['Type'])); // worksheet
                            $wrel_path = $this->_getTarget(dirname($rel_target), (string)$workbookRelation['Target']);
                            if (!$this->entryExists($wrel_path)) {
                                continue;
                            }


                            if ($wrel_type === 'worksheet') { // Sheets
                                if ($sheet = $this->getEntryXML($wrel_path)) {
                                    $index = array_search((string)$workbookRelation['Id'], $index_rId, true);
                                    $this->sheets[$index] = $sheet;
                                    $this->sheetFiles[$index] = $wrel_path;
                                }
                            } elseif ($wrel_type === 'sharedStrings') {
                                if ($sharedStrings = $this->getEntryXML($wrel_path)) {
                                    foreach ($sharedStrings->si as $val) {
                                        if (isset($val->t)) {
                                            $this->sharedstrings[] = (string)$val->t;
                                        } elseif (isset($val->r)) {
                                            $this->sharedstrings[] = $this->_parseRichText($val);
                                        }
                                    }
                                }
                            } elseif ($wrel_type === 'styles') {
                                $this->styles = $this->getEntryXML($wrel_path);

                                // number formats
                                $this->nf = [];
                                if (isset($this->styles->numFmts->numFmt)) {
                                    foreach ($this->styles->numFmts->numFmt as $v) {
                                        $this->nf[(int)$v['numFmtId']] = (string)$v['formatCode'];
                                    }
                                }

                                $this->cellFormats = [];
                                if (isset($this->styles->cellXfs->xf)) {
                                    foreach ($this->styles->cellXfs->xf as $v) {
                                        $x = [
                                            'format' => null
                                        ];
                                        foreach ($v->attributes() as $k1 => $v1) {
                                            $x[ $k1 ] = (int) $v1;
                                        }
                                        if (isset($x['numFmtId'])) {
                                            if (isset($this->nf[$x['numFmtId']])) {
                                                $x['format'] = $this->nf[$x['numFmtId']];
                                            } elseif (isset(self::$CF[$x['numFmtId']])) {
                                                $x['format'] = self::$CF[$x['numFmtId']];
                                            }
                                        }

                                        $this->cellFormats[] = $x;
                                    }
                                }
                            } elseif ($wrel_type === 'theme') {
                                $this->theme = $this->getEntryXML($wrel_path);
                            }
                        }

                        break;
                    }
                    // reptile hack :: find active sheet from workbook.xml
                    foreach ($workbook->bookViews->workbookView as $s) {
                        if (!empty($s['activeTab'])) {
                            $this->activeSheet = (int)$s['activeTab'];
                        }
                    }
                }
            }
        }

//        $m2 = memory_get_peak_usage(true);
//        echo __FUNCTION__.' M='.round( ($m2-$m1) / 1048576, 2).'MB'.PHP_EOL;

        if (count($this->sheets)) {
            // Sort sheets
            ksort($this->sheets);

            return true;
        }

        return false;
    }

    public function getEntryXML($name)
    {
        if ($entry_xml = $this->getEntryData($name)) {
            $this->deleteEntry($name); // economy memory
            // dirty remove namespace prefixes and empty rows
            $entry_xml = preg_replace('/xmlns[^=]*="[^"]*"/i', '', $entry_xml); // remove namespaces
            $entry_xml .= ' '; // force run garbage collector
            $entry_xml = preg_replace('/[a-zA-Z0-9]+:([a-zA-Z0-9]+="[^"]+")/', '$1', $entry_xml); // remove namespaced attrs
            $entry_xml .= ' ';
            $entry_xml = preg_replace('/<[a-zA-Z0-9]+:([^>]+)>/', '<$1>', $entry_xml); // fix namespaced openned tags
            $entry_xml .= ' ';
            $entry_xml = preg_replace('/<\/[a-zA-Z0-9]+:([^>]+)>/', '</$1>', $entry_xml); // fix namespaced closed tags
            $entry_xml .= ' ';

            if (strpos($name, '/sheet')) { // dirty skip empty rows
                // remove <row...> <c /><c /></row>
                $entry_xml = preg_replace('/<row[^>]+>\s*(<c[^\/]+\/>\s*)+<\/row>/', '', $entry_xml, -1, $cnt);
                $entry_xml .= ' ';
                // remove <row />
                $entry_xml = preg_replace('/<row[^\/>]*\/>/', '', $entry_xml, -1, $cnt2);
                $entry_xml .= ' ';
                // remove <row...></row>
                $entry_xml = preg_replace('/<row[^>]*><\/row>/', '', $entry_xml, -1, $cnt3);
                $entry_xml .= ' ';
                if ($cnt || $cnt2 || $cnt3) {
                    $entry_xml = preg_replace('/<dimension[^\/]+\/>/', '', $entry_xml);
                    $entry_xml .= ' ';
                }
//              file_put_contents( basename( $name ), $entry_xml ); // @to do comment!!!
            }
            $entry_xml = trim($entry_xml);

//            $m1 = memory_get_usage();
            // XML External Entity (XXE) Prevention, libxml_disable_entity_loader deprecated in PHP 8
            if (LIBXML_VERSION < 20900 && function_exists('libxml_disable_entity_loader')) {
                $_old = libxml_disable_entity_loader();
            }

            $_old_uie = libxml_use_internal_errors(true);

            $entry_xmlobj = simplexml_load_string($entry_xml, 'SimpleXMLElement', LIBXML_COMPACT | LIBXML_PARSEHUGE);

            libxml_use_internal_errors($_old_uie);

            if (LIBXML_VERSION < 20900 && function_exists('libxml_disable_entity_loader')) {
                /** @noinspection PhpUndefinedVariableInspection */
                libxml_disable_entity_loader($_old);
            }

//            $m2 = memory_get_usage();
//            echo round( ($m2-$m1) / (1024 * 1024), 2).' MB'.PHP_EOL;

            if ($entry_xmlobj) {
                return $entry_xmlobj;
            }
            $e = libxml_get_last_error();
            if ($e) {
                $this->error(3, 'XML-entry ' . $name . ' parser error ' . $e->message . ' line ' . $e->line);
            }
        } else {
            $this->error(4, 'XML-entry not found ' . $name);
        }

        return false;
    }

    // sheets numeration: 1,2,3....

    public function getEntryData($name)
    {
        $name = ltrim(str_replace('\\', '/', $name), '/');
        $dir = $this->_strtoupper(dirname($name));
        $name = $this->_strtoupper(basename($name));
        foreach ($this->package['entries'] as &$entry) {
            if ($this->_strtoupper($entry['path']) === $dir && $this->_strtoupper($entry['name']) === $name) {
                if ($entry['error']) {
                    return false;
                }
                switch ($entry['cm']) {
                    case -1:
                    case 0: // Stored
                        // Here is nothing to do, the file ist flat.
                        break;
                    case 8: // Deflated
                        $entry['data'] = gzinflate($entry['data']);
                        break;
                    case 12: // BZIP2
                        if (extension_loaded('bz2')) {
                            $entry['data'] = bzdecompress($entry['data']);
                        } else {
                            $entry['error'] = 7;
                            $entry['error_message'] = 'PHP BZIP2 extension not available.';
                        }
                        break;
                    default:
                        $entry['error'] = 6;
                        $entry['error_msg'] = 'De-/Compression method '.$entry['cm'].' is not supported.';
                }
                if (!$entry['error'] && $entry['cm'] > -1) {
                    $entry['cm'] = -1;
                    if ($entry['data'] === false) {
                        $entry['error'] = 2;
                        $entry['error_msg'] = 'Decompression of data failed.';
                    } elseif ($this->_strlen($entry['data']) !== (int)$entry['ucs']) {
                        $entry['error'] = 3;
                        $entry['error_msg'] = 'Uncompressed size is not equal with the value in header information.';
                    } elseif (crc32($entry['data']) !== $entry['crc']) {
                        $entry['error'] = 4;
                        $entry['error_msg'] = 'CRC32 checksum is not equal with the value in header information.';
                    }
                }

                return $entry['data'];
            }
        }
        unset($entry);
        $this->error(5, 'Entry not found ' . ($dir ? $dir . '/' : '') . $name);

        return false;
    }
    public function deleteEntry($name)
    {
        $name = ltrim(str_replace('\\', '/', $name), '/');
        $dir = $this->_strtoupper(dirname($name));
        $name = $this->_strtoupper(basename($name));
        foreach ($this->package['entries'] as $k => $entry) {
            if ($this->_strtoupper($entry['path']) === $dir && $this->_strtoupper($entry['name']) === $name) {
                unset($this->package['entries'][$k]);
                return true;
            }
        }
        return false;
    }

    protected function _strtoupper($str)
    {
        return (ini_get('mbstring.func_overload') & 2) ? mb_strtoupper($str, '8bit') : strtoupper($str);
    }

    protected function _getTarget($base, $target)
    {
        $target = trim($target);
        if (strpos($target, '/') === 0) {
            return $this->_substr($target, 1);
        }
        $target = ($base ? $base . '/' : '') . $target;
        // a/b/../c -> a/c
        $parts = explode('/', $target);
        $abs = [];
        foreach ($parts as $p) {
            if ('.' === $p) {
                continue;
            }
            if ('..' === $p) {
                array_pop($abs);
            } else {
                $abs[] = $p;
            }
        }
        return implode('/', $abs);
    }

    /*
     * @param string $name Filename in archive
     * @return SimpleXMLElement|bool
    */

    public function entryExists($name)
    {
        // 0.6.6
        $dir = $this->_strtoupper(dirname($name));
        $name = $this->_strtoupper(basename($name));
        foreach ($this->package['entries'] as $entry) {
            if ($this->_strtoupper($entry['path']) === $dir && $this->_strtoupper($entry['name']) === $name) {
                return true;
            }
        }

        return false;
    }

    protected function _parseRichText($is = null)
    {
        $value = [];

        if (isset($is->t)) {
            $value[] = (string)$is->t;
        } elseif (isset($is->r)) {
            foreach ($is->r as $run) {
                $value[] = (string)$run->t;
            }
        }

        return implode('', $value);
    }

    public static function parseFile($filename, $debug = false)
    {
        return self::parse($filename, false, $debug);
    }

    public static function parse($filename, $is_data = false, $debug = false)
    {
        $xlsx = new self();
        $xlsx->debug = $debug;
        if ($xlsx->_unzip($filename, $is_data)) {
            $xlsx->_parse();
        }
        if ($xlsx->success()) {
            return $xlsx;
        }
        self::parseError($xlsx->error());
        self::parseErrno($xlsx->errno());

        return false;
    }

    public function success()
    {
        return !$this->error;
    }

    // https://github.com/shuchkin/simplexlsx#gets-extend-cell-info-by--rowsex

    public static function parseError($set = false)
    {
        static $error = false;

        return $set ? $error = $set : $error;
    }

    public static function parseErrno($set = false)
    {
        static $errno = false;

        return $set ? $errno = $set : $errno;
    }

    public function errno()
    {
        return $this->errno;
    }

    public static function parseData($data, $debug = false)
    {
        return self::parse($data, true, $debug);
    }


    public function worksheet($worksheetIndex = 0)
    {


        if (isset($this->sheets[$worksheetIndex])) {
            $ws = $this->sheets[$worksheetIndex];

            if (!isset($this->hyperlinks[$worksheetIndex]) && isset($ws->hyperlinks)) {
                $this->hyperlinks[$worksheetIndex] = [];
                $sheet_rels = str_replace('worksheets', 'worksheets/_rels', $this->sheetFiles[$worksheetIndex]) . '.rels';
                $link_ids = [];

                if ($rels = $this->getEntryXML($sheet_rels)) {
                    // hyperlink
//                  $rel_base = dirname( $sheet_rels );
                    foreach ($rels->Relationship as $rel) {
                        $rel_type = basename(trim((string)$rel['Type']));
                        if ($rel_type === 'hyperlink') {
                            $rel_id = (string)$rel['Id'];
                            $rel_target = (string)$rel['Target'];
                            $link_ids[$rel_id] = $rel_target;
                        }
                    }
                }
                foreach ($ws->hyperlinks->hyperlink as $hyperlink) {
                    $ref = (string)$hyperlink['ref'];
                    if ($this->_strpos($ref, ':') > 0) { // A1:A8 -> A1
                        $ref = explode(':', $ref);
                        $ref = $ref[0];
                    }
//                      $this->hyperlinks[ $worksheetIndex ][ $ref ] = (string) $hyperlink['display'];
                    $loc = (string)$hyperlink['location'];
                    $id = (string)$hyperlink['id'];
                    if ($id) {
                        $href = $link_ids[$id] . ($loc ? '#' . $loc : '');
                    } else {
                        $href = $loc;
                    }
                    $this->hyperlinks[$worksheetIndex][$ref] = $href;
                }
            }

            return $ws;
        }
        $this->error(6, 'Worksheet not found ' . $worksheetIndex);

        return false;
    }

    protected function _strpos($haystack, $needle, $offset = 0)
    {
        return (ini_get('mbstring.func_overload') & 2) ? mb_strpos($haystack, $needle, $offset, '8bit') : strpos($haystack, $needle, $offset);
    }

    /**
     * returns [numCols,numRows] of worksheet
     *
     * @param int $worksheetIndex
     *
     * @return array
     */
    public function dimension($worksheetIndex = 0)
    {

        if (($ws = $this->worksheet($worksheetIndex)) === false) {
            return [0, 0];
        }
        /* @var SimpleXMLElement $ws */

        $ref = (string)$ws->dimension['ref'];

        if ($this->_strpos($ref, ':') !== false) {
            $d = explode(':', $ref);
            $idx = $this->getIndex($d[1]);

            return [$idx[0] + 1, $idx[1] + 1];
        }
        /*
        if ( $ref !== '' ) { // 0.6.8
            $index = $this->getIndex( $ref );

            return [ $index[0] + 1, $index[1] + 1 ];
        }
        */

        // slow method
        $maxC = $maxR = 0;
        foreach ($ws->sheetData->row as $row) {
            foreach ($row->c as $c) {
                $idx = $this->getIndex((string)$c['r']);
                $x = $idx[0];
                $y = $idx[1];
                if ($x > 0) {
                    if ($x > $maxC) {
                        $maxC = $x;
                    }
                    if ($y > $maxR) {
                        $maxR = $y;
                    }
                }
            }
        }

        return [$maxC + 1, $maxR + 1];
    }

    public function getIndex($cell = 'A1')
    {

        if (preg_match('/([A-Z]+)(\d+)/', $cell, $m)) {
            $col = $m[1];
            $row = $m[2];

            $colLen = $this->_strlen($col);
            $index = 0;

            for ($i = $colLen - 1; $i >= 0; $i--) {
                $index += (ord($col[$i]) - 64) * pow(26, $colLen - $i - 1);
            }

            return [$index - 1, $row - 1];
        }

//      $this->error( 'Invalid cell index ' . $cell );

        return [-1, -1];
    }

    public function value($cell)
    {
        // Determine data type
        $dataType = (string)$cell['t'];

        if ($dataType === '' || $dataType === 'n') { // number
            $s = (int)$cell['s'];
            if ($s > 0 && isset($this->cellFormats[$s])) {
                if (array_key_exists('format', $this->cellFormats[$s])) {
                    $format = $this->cellFormats[$s]['format'];
                    if (preg_match('/(m|AM|PM)/', preg_replace('/\"[^"]+\"/', '', $format))) { // [mm]onth,AM|PM
                        $dataType = 'D';
                    }
                } else {
                    $dataType = 'n';
                }
            }
        }

        $value = '';

        switch ($dataType) {
            case 's':
                // Value is a shared string
                if ((string)$cell->v !== '') {
                    $value = $this->sharedstrings[(int)$cell->v];
                }
                break;

            case 'str': // formula?
                if ((string)$cell->v !== '') {
                    $value = (string)$cell->v;
                }
                break;

            case 'b':
                // Value is boolean
                $value = (string)$cell->v;
                if ($value === '0') {
                    $value = false;
                } elseif ($value === '1') {
                    $value = true;
                } else {
                    $value = (bool)$cell->v;
                }

                break;

            case 'inlineStr':
                // Value is rich text inline
                $value = $this->_parseRichText($cell->is);

                break;

            case 'e':
                // Value is an error message
                if ((string)$cell->v !== '') {
                    $value = (string)$cell->v;
                }
                break;

            case 'D':
                // Date as float
                if (!empty($cell->v)) {
                    $value = $this->datetimeFormat ? gmdate($this->datetimeFormat, $this->unixstamp((float)$cell->v)) : (float)$cell->v;
                }
                break;

            case 'd':
                // Date as ISO YYYY-MM-DD
                if ((string)$cell->v !== '') {
                    $value = (string)$cell->v;
                }
                break;

            default:
                // Value is a string
                $value = (string)$cell->v;

                // Check for numeric values
                if (is_numeric($value)) {
                    /** @noinspection TypeUnsafeComparisonInspection */
                    if ($value == (int)$value) {
                        $value = (int)$value;
                    } /** @noinspection TypeUnsafeComparisonInspection */ elseif ($value == (float)$value) {
                        $value = (float)$value;
                    }
                }
        }

        return $value;
    }

    public function unixstamp($excelDateTime)
    {

        $d = floor($excelDateTime); // days since 1900 or 1904
        $t = $excelDateTime - $d;

        if ($this->date1904) {
            $d += 1462;
        }

        $t = (abs($d) > 0) ? ($d - 25569) * 86400 + round($t * 86400) : round($t * 86400);

        return (int)$t;
    }

    public function href($worksheetIndex, $cell)
    {
        $ref = (string)$cell['r'];
        return isset($this->hyperlinks[$worksheetIndex][$ref]) ? $this->hyperlinks[$worksheetIndex][$ref] : '';
    }

    public function toHTML($worksheetIndex = 0)
    {
        $s = '<table class=excel>';
        foreach ($this->readRows($worksheetIndex) as $r) {
            $s .= '<tr>';
            foreach ($r as $c) {
                $s .= '<td nowrap>' . ($c === '' ? '&nbsp' : htmlspecialchars($c, ENT_QUOTES)) . '</td>';
            }
            $s .= "</tr>\r\n";
        }
        $s .= '</table>';

        return $s;
    }
    public function toHTMLEx($worksheetIndex = 0)
    {
        $s = '<table class=excel>';
        $y = 0;
        foreach ($this->readRowsEx($worksheetIndex) as $r) {
            $s .= '<tr>';
            $x = 0;
            foreach ($r as $c) {
                $tag = 'td';
                $css = $c['css'];
                if ($y === 0) {
                    $tag = 'th';
                    $css .= $c['width'] ? 'width: '.round($c['width'] * 0.47, 2).'em;' : '';
                }

                if ($x === 0 && $c['height']) {
                    $css .= 'height: '.round($c['height'] * 1.3333).'px;';
                }
                $s .= '<'.$tag.' style="'.$css.'" nowrap>' . ($c['value'] === '' ? '&nbsp' : htmlspecialchars($c['value'], ENT_QUOTES)) . '</'.$tag.'>';
                $x++;
            }
            $s .= "</tr>\r\n";
            $y++;
        }
        $s .= '</table>';

        return $s;
    }
    public function rows($worksheetIndex = 0, $limit = 0)
    {
        return iterator_to_array($this->readRows($worksheetIndex, $limit), false);
    }
    // thx Gonzo
    /**
     * @param $worksheetIndex
     * @param $limit
     * @return \Generator
     */
    public function readRows($worksheetIndex = 0, $limit = 0)
    {

        if (($ws = $this->worksheet($worksheetIndex)) === false) {
            return;
        }
        $dim = $this->dimension($worksheetIndex);
        $numCols = $dim[0];
        $numRows = $dim[1];

        $emptyRow = [];
        for ($i = 0; $i < $numCols; $i++) {
            $emptyRow[] = '';
        }

        $curR = 0;
        $_limit = $limit;
        /* @var SimpleXMLElement $ws */
        foreach ($ws->sheetData->row as $row) {
            $r = $emptyRow;
            $curC = 0;
            foreach ($row->c as $c) {
                // detect skipped cols
                $idx = $this->getIndex((string)$c['r']);
                $x = $idx[0];
                $y = $idx[1];

                if ($x > -1) {
                    $curC = $x;
                    while ($curR < $y) {
                        yield $emptyRow;
                        $curR++;
                        $_limit--;
                        if ($_limit === 0) {
                            return;
                        }
                    }
                }
                $r[$curC] = $this->value($c);
                $curC++;
            }
            yield $r;

            $curR++;
            $_limit--;
            if ($_limit === 0) {
                return;
            }
        }
        while ($curR < $numRows) {
            yield $emptyRow;
            $curR++;
            $_limit--;
            if ($_limit === 0) {
                return;
            }
        }
    }

    public function rowsEx($worksheetIndex = 0, $limit = 0)
    {
        return iterator_to_array($this->readRowsEx($worksheetIndex, $limit), false);
    }
    // https://github.com/shuchkin/simplexlsx#gets-extend-cell-info-by--rowsex
    /**
     * @param $worksheetIndex
     * @param $limit
     * @return \Generator|null
     */
    public function readRowsEx($worksheetIndex = 0, $limit = 0)
    {
        if (!$this->rowsExReader) {
            require_once __DIR__ . '/SimpleXLSXEx.php';
            $this->rowsExReader = new SimpleXLSXEx($this);
        }
        return $this->rowsExReader->readRowsEx($worksheetIndex, $limit);
    }

    /**
     * Returns cell value
     * VERY SLOW! Use ->rows() or ->rowsEx()
     *
     * @param int $worksheetIndex
     * @param string|array $cell ref or coords, D12 or [3,12]
     *
     * @return mixed Returns NULL if not found
     */
    public function getCell($worksheetIndex = 0, $cell = 'A1')
    {

        if (($ws = $this->worksheet($worksheetIndex)) === false) {
            return false;
        }
        if (is_array($cell)) {
            $cell = $this->_num2name($cell[0]) . $cell[1];// [3,21] -> D21
        }
        if (is_string($cell)) {
            $result = $ws->sheetData->xpath("row/c[@r='" . $cell . "']");
            if (count($result)) {
                return $this->value($result[0]);
            }
        }

        return null;
    }

    protected function _num2name($num)
    {
        $numeric = ($num - 1) % 26;
        $letter = chr(65 + $numeric);
        $num2 = (int)(($num - 1) / 26);
        if ($num2 > 0) {
            return $this->_num2name($num2) . $letter;
        }
        return $letter;
    }

    public function getSheets()
    {
        return $this->sheets;
    }

    public function sheetsCount()
    {
        return count($this->sheets);
    }

    public function sheetName($worksheetIndex)
    {
        if (isset($this->sheetNames[$worksheetIndex])) {
            return $this->sheetNames[$worksheetIndex];
        }

        return false;
    }

    public function sheetNames()
    {

        return $this->sheetNames;
    }

    public function getStyles()
    {
        return $this->styles;
    }

    public function getPackage()
    {
        return $this->package;
    }

    public function setDateTimeFormat($value)
    {
        $this->datetimeFormat = is_string($value) ? $value : false;
    }
}


?>