Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Content/Text/Markdown.php
*/
namespace Friendica\Content\Text;
use Friendica\Core\System;
use Friendica\DI;
use Friendica\Model\Contact;
/**
* Friendica-specific usage of Markdown
*
* @author Hypolite Petovan <hypolite@mrpetovan.com>
*/
class Markdown
{
/**
* Converts a Markdown string into HTML. The hardwrap parameter maximizes
* compatibility with Diaspora in spite of the Markdown standard.
*
* @brief Converts a Markdown string into HTML
* @param string $text
* @param bool $hardwrap
* @return string
* @throws \Exception
*/
public static function convert($text, $hardwrap = true) {
$stamp1 = microtime(true);
$MarkdownParser = new MarkdownParser();
$MarkdownParser->code_class_prefix = 'language-';
$MarkdownParser->hard_wrap = $hardwrap;
$MarkdownParser->hashtag_protection = true;
$MarkdownParser->url_filter_func = function ($url) {
if (strpos($url, '#') === 0) {
$url = ltrim($_SERVER['REQUEST_URI'], '/') . $url;
}
return $url;
};
$html = $MarkdownParser->transform($text);
DI::profiler()->saveTimestamp($stamp1, "parser", System::callstack());
return $html;
}
/**
* @brief Callback function to replace a Diaspora style mention in a mention for Friendica
*
* @param array $match Matching values for the callback
* [1] = mention type (@ or !)
* [2] = name (optional)
* [3] = address
* @return string Replaced mention
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function diasporaMention2BBCodeCallback($match)
{
if ($match[3] == '') {
return;
}
$data = Contact::getDetailsByAddr($match[3]);
if (empty($data)) {
return;
}
$name = $match[2];
if ($name == '') {
$name = $data['name'];
}
return $match[1] . '[url=' . $data['url'] . ']' . $name . '[/url]';
}
/*
* we don't want to support a bbcode specific markdown interpreter
* and the markdown library we have is pretty good, but provides HTML output.
* So we'll use that to convert to HTML, then convert the HTML back to bbcode,
* and then clean up a few Diaspora specific constructs.
*/
public static function toBBCode($s)
{
$s = html_entity_decode($s, ENT_COMPAT, 'UTF-8');
// The parser cannot handle paragraphs correctly
$s = str_replace(['</p>', '<p>', '<p dir="ltr">'], ['<br>', '<br>', '<br>'], $s);
// Escaping hashtags that could be titles
$s = preg_replace('/^\#([^\s\#])/im', '\#$1', $s);
$s = self::convert($s);
$regexp = "/([@!])\{(?:([^\}]+?); ?)?([^\} ]+)\}/";
$s = preg_replace_callback($regexp, ['self', 'diasporaMention2BBCodeCallback'], $s);
$s = HTML::toBBCode($s);
// protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
$s = str_replace('&#x2672;', html_entity_decode('&#x2672;', ENT_QUOTES, 'UTF-8'), $s);
// Convert everything that looks like a link to a link
$s = preg_replace('/([^\]=]|^)(https?\:\/\/)([a-zA-Z0-9:\/\-?&;.=_~#%$!+,@]+(?<!,))/ism', '$1[url=$2$3]$2$3[/url]', $s);
//$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3$4]$2$3$4[/url]',$s);
$s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism', '[youtube]$2[/youtube]', 'url', $s);
$s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism' , '[youtube]$1[/youtube]', 'url', $s);
$s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism' , '[vimeo]$2[/vimeo]' , 'url', $s);
$s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism' , '[vimeo]$1[/vimeo]' , 'url', $s);
// remove duplicate adjacent code tags
$s = preg_replace('/(\[code\])+(.*?)(\[\/code\])+/ism', '[code]$2[/code]', $s);
// Don't show link to full picture (until it is fixed)
$s = BBCode::scaleExternalImages($s, false);
return $s;
}
}