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