<?php /** * @file include/markdown.php * @brief Some functions for BB conversions for Diaspora protocol. */ use Michelf\MarkdownExtra; use Markdownify\Converter; require_once("include/oembed.php"); require_once("include/event.php"); require_once("include/html2bbcode.php"); require_once("include/bbcode.php"); function get_bb_tag_pos($s, $name, $occurance = 1) { if($occurance < 1) $occurance = 1; $start_open = -1; for($i = 1; $i <= $occurance; $i++) { if( $start_open !== false) $start_open = strpos($s, '[' . $name, $start_open + 1); // allow [name= type tags } if( $start_open === false) return false; $start_equal = strpos($s, '=', $start_open); $start_close = strpos($s, ']', $start_open); if( $start_close === false) return false; $start_close++; $end_open = strpos($s, '[/' . $name . ']', $start_close); if( $end_open === false) return false; $res = array( 'start' => array('open' => $start_open, 'close' => $start_close), 'end' => array('open' => $end_open, 'close' => $end_open + strlen('[/' . $name . ']')) ); if( $start_equal !== false) $res['start']['equal'] = $start_equal + 1; return $res; } function bb_tag_preg_replace($pattern, $replace, $name, $s) { $string = $s; $occurance = 1; $pos = get_bb_tag_pos($string, $name, $occurance); while($pos !== false && $occurance < 1000) { $start = substr($string, 0, $pos['start']['open']); $subject = substr($string, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']); $end = substr($string, $pos['end']['close']); if($end === false) $end = ''; $subject = preg_replace($pattern, $replace, $subject); $string = $start . $subject . $end; $occurance++; $pos = get_bb_tag_pos($string, $name, $occurance); } return $string; } function share_shield($m) { return str_replace($m[1],'!=+=+=!' . base64url_encode($m[1]) . '=+!=+!=',$m[0]); } function share_unshield($m) { $x = str_replace(array('!=+=+=!','=+!=+!='),array('',''),$m[1]); return str_replace($m[1], base64url_decode($x), $m[0]); } /** * @brief * * 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. * * @param string $s * @param boolean $use_zrl default false * @return string */ function markdown_to_bb($s, $use_zrl = false, $options = []) { if(is_array($s)) { btlogger('markdown_to_bb called with array. ' . print_r($s,true), LOGGER_NORMAL, LOG_WARNING); return ''; } $s = str_replace("
","\r",$s); $s = str_replace("
\n>","",$s); $s = html_entity_decode($s,ENT_COMPAT,'UTF-8'); // if empty link text replace with the url $s = preg_replace("/\[\]\((.*?)\)/ism",'[$1]($1)',$s); $x = [ 'text' => $s , 'zrl' => $use_zrl, 'options' => $options ]; call_hooks('markdown_to_bb_init',$x); $s = $x['text']; // Escaping the hash tags - doesn't always seem to work // $s = preg_replace('/\#([^\s\#])/','\\#$1',$s); // This seems to work $s = preg_replace('/\#([^\s\#])/','#$1',$s); $s = MarkdownExtra::defaultTransform($s); $s = str_replace("\r","",$s); $s = str_replace('#','#',$s); $s = html2bbcode($s); // Convert everything that looks like a link to a link if($use_zrl) { $s = str_replace(array('[img','/img]'),array('[zmg','/zmg]'),$s); $s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\(\)]+)/ism", '$1[zrl=$2$3]$2$3[/zrl]',$s); } else { $s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\(\)]+)/ism", '$1[url=$2$3]$2$3[/url]',$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) $s = scale_external_images($s, false); call_hooks('markdown_to_bb',$s); return $s; }