From 8c40a86ea0d5475148b75a9e926397c630604925 Mon Sep 17 00:00:00 2001
From: "tristan.champomier" <rooty@rooty.me>
Date: Thu, 30 Sep 2021 08:37:09 +0200
Subject: [PATCH] Fixed html truncate by adding a truncateHtml function in
 Chaine class

---
 lib/system/system_utils/chaine.php | 92 ++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/lib/system/system_utils/chaine.php b/lib/system/system_utils/chaine.php
index 2feab00..8ac36a6 100755
--- a/lib/system/system_utils/chaine.php
+++ b/lib/system/system_utils/chaine.php
@@ -142,6 +142,98 @@ var $src  = null;
 		//$tmp = addslashes(stripslashes($tmp));
 		return $tmp;
 	}
+	
+	function truncateHtml($length = 500, $ending = '...', $exact = false, $considerHtml = true)
+	{
+		$text=$this->src;
+		if ($considerHtml) {
+			// if the plain text is shorter than the maximum length, return the whole text
+			if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) {
+				return $text;
+			}
+			// splits all html-tags to scanable lines
+			preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER);
+			$total_length = strlen($ending);
+			$open_tags = array();
+			$truncate = '';
+			foreach ($lines as $line_matchings) {
+				// if there is any html-tag in this line, handle it and add it (uncounted) to the output
+				if (!empty($line_matchings[1])) {
+					// if it's an "empty element" with or without xhtml-conform closing slash
+					if (preg_match('/^<(\s*.+?\/\s*|\s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(\s.+?)?)>$/is', $line_matchings[1])) {
+						// do nothing
+					// if tag is a closing tag
+					} else if (preg_match('/^<\s*\/([^\s]+?)\s*>$/s', $line_matchings[1], $tag_matchings)) {
+						// delete tag from $open_tags list
+						$pos = array_search($tag_matchings[1], $open_tags);
+						if ($pos !== false) {
+						unset($open_tags[$pos]);
+						}
+					// if tag is an opening tag
+					} else if (preg_match('/^<\s*([^\s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) {
+						// add tag to the beginning of $open_tags list
+						array_unshift($open_tags, strtolower($tag_matchings[1]));
+					}
+					// add html-tag to $truncate'd text
+					$truncate .= $line_matchings[1];
+				}
+				// calculate the length of the plain text part of the line; handle entities as one character
+				$content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', ' ', $line_matchings[2]));
+				if ($total_length+$content_length> $length) {
+					// the number of characters which are left
+					$left = $length - $total_length;
+					$entities_length = 0;
+					// search for html entities
+					if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) {
+						// calculate the real length of all entities in the legal range
+						foreach ($entities[0] as $entity) {
+							if ($entity[1]+1-$entities_length <= $left) {
+								$left--;
+								$entities_length += strlen($entity[0]);
+							} else {
+								// no more characters left
+								break;
+							}
+						}
+					}
+					$truncate .= substr($line_matchings[2], 0, $left+$entities_length);
+					// maximum lenght is reached, so get off the loop
+					break;
+				} else {
+					$truncate .= $line_matchings[2];
+					$total_length += $content_length;
+				}
+				// if the maximum length is reached, get off the loop
+				if($total_length>= $length) {
+					break;
+				}
+			}
+		} else {
+			if (strlen($text) <= $length) {
+				return $text;
+			} else {
+				$truncate = substr($text, 0, $length - strlen($ending));
+			}
+		}
+		// if the words shouldn't be cut in the middle...
+		if (!$exact) {
+			// ...search the last occurance of a space...
+			$spacepos = strrpos($truncate, ' ');
+			if (isset($spacepos)) {
+				// ...and cut the text in this position
+				$truncate = substr($truncate, 0, $spacepos);
+			}
+		}
+		// add the defined ending to the text
+		$truncate .= $ending;
+		if($considerHtml) {
+			// close all unclosed html-tags
+			foreach ($open_tags as $tag) {
+				$truncate .= '</' . $tag . '>';
+			}
+		}
+		return $truncate;
+	}
 
 	function chainCut($nbChar)
 	{