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