3 * @copyright Copyright (C) 2010-2023, the Friendica project
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Content\Text;
24 use Friendica\Core\Logger;
25 use Friendica\Core\System;
27 use Friendica\Model\Contact;
30 * Friendica-specific usage of Markdown
35 * Converts a Markdown string into HTML. The hardwrap parameter maximizes
36 * compatibility with Diaspora in spite of the Markdown standard.
39 * @param bool $hardwrap Enables line breaks on \n without two trailing spaces
40 * @param string $baseuri Optional. Prepend anchor links with this URL
43 public static function convert($text, $hardwrap = true, $baseuri = null) {
44 DI::profiler()->startRecording('rendering');
46 $MarkdownParser = new MarkdownParser();
47 $MarkdownParser->code_class_prefix = 'language-';
48 $MarkdownParser->hard_wrap = $hardwrap;
49 $MarkdownParser->hashtag_protection = true;
50 $MarkdownParser->url_filter_func = function ($url) use ($baseuri) {
51 if (!empty($baseuri) && strpos($url, '#') === 0) {
52 $url = ltrim($baseuri, '/') . $url;
57 $text = self::convertDiasporaMentionsToHtml($text);
59 $html = $MarkdownParser->transform($text);
61 DI::profiler()->stopRecording();
67 * Replace Diaspora-style mentions in a text since they trip the Markdown parser autolinker.
72 private static function convertDiasporaMentionsToHtml(string $text)
74 return preg_replace_callback(
75 '/([@!]){(?:([^}]+?); ?)?([^} ]+)}/',
77 * Matching values for the callback
78 * [1] = mention type (@ or !)
79 * [2] = name (optional)
83 if ($matches[3] == '') {
87 $data = Contact::getByURL($matches[3]);
96 $name = $data['name'];
99 return $matches[1] . '<a href="' . $data['url'] . '">' . $name . '</a>';
106 * we don't want to support a bbcode specific markdown interpreter
107 * and the markdown library we have is pretty good, but provides HTML output.
108 * So we'll use that to convert to HTML, then convert the HTML back to bbcode,
109 * and then clean up a few Diaspora specific constructs.
111 public static function toBBCode($s): string
113 // @TODO Temporary until we find the source of the null value to finally set the correct type-hint
115 Logger::warning('Received null value', ['callstack' => System::callstack()]);
123 DI::profiler()->startRecording('rendering');
125 // The parser cannot handle paragraphs correctly
126 $s = str_replace(['</p>', '<p>', '<p dir="ltr">'], ['<br>', '<br>', '<br>'], $s);
128 // Escaping hashtags that could be titles
129 $s = preg_replace('/^\#([^\s\#])/im', '\#$1', $s);
131 $s = self::convert($s);
133 $s = HTML::toBBCode($s);
135 // protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
136 $s = str_replace('♲', html_entity_decode('♲', ENT_QUOTES, 'UTF-8'), $s);
138 //$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3$4]$2$3$4[/url]',$s);
139 $s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism', '[youtube]$2[/youtube]', 'url', $s);
140 $s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism' , '[youtube]$1[/youtube]', 'url', $s);
141 $s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/www.youtube.com\/shorts\/(.*?)\].*?\[\/url\]/ism' , '[youtube]$1[/youtube]', 'url', $s);
142 $s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism' , '[vimeo]$2[/vimeo]' , 'url', $s);
143 $s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism' , '[vimeo]$1[/vimeo]' , 'url', $s);
145 // remove duplicate adjacent code tags
146 $s = preg_replace('/(\[code\])+(.*?)(\[\/code\])+/ism', '[code]$2[/code]', $s);
148 DI::profiler()->stopRecording();