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<?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;
}
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