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 <?php
 
 /**
  *  ocs-webserver
  *
  *  Copyright 2016 by pling GmbH.
  *
  *    This file is part of ocs-webserver.
  *
  *    This program is free software: you can redistribute it and/or modify
  *    it under the terms of the GNU Affero General Public License as
  *    published by the Free Software Foundation, either version 3 of the
  *    License, or (at your option) any later version.
  *
  *    This program 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 Affero General Public License for more details.
  *
  *    You should have received a copy of the GNU Affero General Public License
  *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  **/
 class Default_View_Helper_Truncate extends Zend_View_Helper_Abstract
 {
 
     /**
      * Truncates text.
      *
      * Cuts a string to the length of $length and replaces the last characters
      * with the ending if the text is longer than length.
      *
      * @param string  $text         String to truncate.
      * @param integer $length       Length of returned string, including ellipsis.
      * @param string  $ending       Ending to be appended to the trimmed string.
      * @param boolean $exact        If false, $text will not be cut mid-word
      * @param boolean $considerHtml If true, HTML tags would be handled correctly
      *
      * @return string Trimmed string.
      */
     public function truncate($text, $length = 150, $ending = '...', $exact = false, $considerHtml = false)
     {
         if (strlen($text) == 0) {
             return '';
         }
 
         $total_length = strlen($ending);
         $open_tags = array();
         $truncate = '';
 
         if ($considerHtml) {
             if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
                 return $text;
             }
 
             preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER);
 
             foreach ($lines as $line_matchings) {
                 if (!empty($line_matchings[1])) {
                     if (preg_match('/^<(s*.+?\/s*|s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(s.+?)?)>$/is', $line_matchings[1])) {
                     } else if (preg_match('/^<s*\/([^s]+?)s*>$/s', $line_matchings[1], $tag_matchings)) {
                         $pos = array_search($tag_matchings[1], $open_tags);
                         if ($pos !== false) {
                             unset($open_tags[$pos]);
                         }
                     } else if (preg_match('/^<s*([^s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) {
                         array_unshift($open_tags, strtolower($tag_matchings[1]));
                     }
                     $truncate .= $line_matchings[1];
                 }
                 $content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', ' ', $line_matchings[2]));
                 if ($total_length + $content_length > $length) {
                     $left = $length - $total_length;
                     $entities_length = 0;
                     if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) {
                         foreach ($entities[0] as $entity) {
                             if ($entity[1] + 1 - $entities_length <= $left) {
                                 $left--;
                                 $entities_length += strlen($entity[0]);
                             } else {
                                 break;
                             }
                         }
                     }
                     $truncate .= substr($line_matchings[2], 0, $left + $entities_length);
                     break;
                 } else {
                     $truncate .= $line_matchings[2];
                     $total_length += $content_length;
                 }
                 if ($total_length >= $length) {
                     break;
                 }
             }
         } else {
             if (strlen($text) <= $length) {
                 return $text;
             } else {
                 $truncate = substr($text, 0, $length - strlen($ending));
             }
         }
 
         if (!$exact) {
             $spacepos = strrpos($truncate, ' ');
             if ($spacepos !== false) {
                 $truncate = substr($truncate, 0, $spacepos);
             }
         }
         $truncate .= $ending;
 
         if ($considerHtml) {
             foreach ($open_tags as $tag) {
                 $truncate .= '</' . $tag . '>';
             }
         }
 
         return $truncate;
     }
 
 }