friendica/include/bb2diaspora.php

<?php

require_once("include/oembed.php");
require_once('include/event.php');

require_once('library/markdown.php');
require_once('include/html2bbcode.php');

// 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.

function diaspora2bb($s) {

	$s = html_entity_decode($s,ENT_COMPAT,'UTF-8');

	$s = preg_replace('/\@\{(.+?)\; (.+?)\@(.+?)\}/','@[url=https://$3/u/$2]$1[/url]',$s);
	$s = Markdown($s);
	$s = html2bbcode($s);
//	$s = str_replace('&#42;','*',$s);

	// we seem to get a lot of text smushed together with links from Diaspora.
	// if it's a url that we haven't already parsed into a bbcode structure, put a space before it.
  	$s = preg_replace("/([^=\"\]])(https?:\/\/)/ism",'$1 $2',$s);

    $s = preg_replace("/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism",'[youtube]$2[/youtube]',$s); 
    $s = preg_replace("/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism",'[youtube]$1[/youtube]',$s); 
	$s = preg_replace("/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism",'[vimeo]$2[/vimeo]',$s); 
	$s = preg_replace("/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism",'[vimeo]$1[/vimeo]',$s); 
	$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url]$2$3$4[/url]',$s);
	// remove duplicate adjacent code tags
	$s = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/ism","[code]$2[/code]", $s);
	$s = scale_diaspora_images($s);
	return $s;
}


function scale_diaspora_images($s,$include_link = true) {

	$matches = null;
	$c = preg_match_all('/\[img\](.*?)\[\/img\]/ism',$s,$matches,PREG_SET_ORDER);
	if($c) {
		require_once('include/Photo.php');
		foreach($matches as $mtch) {
			logger('scale_diaspora_image: ' . $mtch[1]);
			$i = fetch_url($mtch[1]);
			if($i) {
				$ph = new Photo($i);
				if($ph->is_valid()) {
					if($ph->getWidth() > 600 || $ph->getHeight() > 600) {
						$ph->scaleImage(600);
						$new_width = $ph->getWidth();
						$new_height = $ph->getHeight();
						logger('scale_diaspora_image: ' . $new_width . 'w ' . $new_height . 'h' . 'match: ' . $mtch[0], LOGGER_DEBUG);
						$s = str_replace($mtch[0],'[img=' . $new_width . 'x' . $new_height. ']' . $mtch[1] . '[/img]'
							. "\n" . (($include_link) 
								? '[url=' . $mtch[1] . ']' . t('view full size') . '[/url]' . "\n"
								: ''),$s);
						logger('scale_diaspora_image: new string: ' . $s, LOGGER_DEBUG);
					}
				}
			}
		}
	}
	return $s;
}

function stripdcode_br_cb($s) {
	return '[code]' . str_replace('<br />', "\n\t", $s[1]) . '[/code]';
}



function bb2diaspora($Text,$preserve_nl = false) {

	$ev = bbtoevent($Text);

	// Replace any html brackets with HTML Entities to prevent executing HTML or script
	// Don't use strip_tags here because it breaks [url] search by replacing & with amp

	$Text = str_replace("<", "&lt;", $Text);
	$Text = str_replace(">", "&gt;", $Text);

	// If we find any event code, turn it into an event.
	// After we're finished processing the bbcode we'll 
	// replace all of the event code with a reformatted version.


	if($preserve_nl)
		$Text = str_replace(array("\n","\r"), array('',''),$Text);

	// Set up the parameters for a URL search string
	$URLSearchString = "^\[\]";
	// Set up the parameters for a MAIL search string
	$MAILSearchString = $URLSearchString;

	// Perform URL Search

	// [img]pathtoimage[/img]

	// the following was added on 10-January-2012 due to an inability of Diaspora's
	// new javascript markdown processor to handle links with images as the link "text"
	// It is not optimal and may be removed if this ability is restored in the future

	$Text = preg_replace("/\[url\=([$URLSearchString]*)\]\[img\](.*?)\[\/img\]\[\/url\]/ism", 
		'![' . t('image/photo') . '](' . '$2' . ')' . "\n" . '[' . t('link') . '](' . '$1' . ')', $Text);

	$Text = preg_replace("/\[bookmark\]([$URLSearchString]*)\[\/bookmark\]/ism", '[$1]($1)', $Text);
	$Text = preg_replace("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism", '[$2]($1)', $Text);

	$Text = preg_replace("/\[url\]([$URLSearchString]*)\[\/url\]/ism", '[$1]($1)', $Text);
	$Text = preg_replace("/\#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", '[#$2]($1)', $Text);
	$Text = preg_replace("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", '[$2]($1)', $Text);


	$Text = preg_replace("/\[img\](.*?)\[\/img\]/", '![' . t('image/photo') . '](' . '$1' . ')', $Text);

	// Perform MAIL Search
	$Text = preg_replace("(\[mail\]([$MAILSearchString]*)\[/mail\])", '[$1](mailto:$1)', $Text);
	$Text = preg_replace("/\[mail\=([$MAILSearchString]*)\](.*?)\[\/mail\]/", '[$2](mailto:$1)', $Text);
         
	$Text = str_replace('*', '\\*', $Text);
	$Text = str_replace('_', '\\_', $Text);

	$Text = str_replace('`','\\`', $Text);

	// Check for bold text
	$Text = preg_replace("(\[b\](.*?)\[\/b\])is",'**$1**',$Text);

	// Check for Italics text
	$Text = preg_replace("(\[i\](.*?)\[\/i\])is",'_$1_',$Text);

	// Check for Underline text
//	$Text = preg_replace("(\[u\](.*?)\[\/u\])is",'<u>$1</u>',$Text);

	// Check for strike-through text
//	$Text = preg_replace("(\[s\](.*?)\[\/s\])is",'<strike>$1</strike>',$Text);

	// Check for over-line text
//	$Text = preg_replace("(\[o\](.*?)\[\/o\])is",'<span class="overline">$1</span>',$Text);

	// Check for colored text
//	$Text = preg_replace("(\[color=(.*?)\](.*?)\[\/color\])is","<span style=\"color: $1;\">$2</span>",$Text);

	// Check for sized text
//	$Text = preg_replace("(\[size=(.*?)\](.*?)\[\/size\])is","<span style=\"font-size: $1;\">$2</span>",$Text);

	// Check for list text
//	$Text = preg_replace("/\[list\](.*?)\[\/list\]/is", '<ul class="listbullet">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[list=1\](.*?)\[\/list\]/is", '<ul class="listdecimal">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[list=i\](.*?)\[\/list\]/s",'<ul class="listlowerroman">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[list=I\](.*?)\[\/list\]/s", '<ul class="listupperroman">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[list=a\](.*?)\[\/list\]/s", '<ul class="listloweralpha">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[list=A\](.*?)\[\/list\]/s", '<ul class="listupperalpha">$1</ul>' ,$Text);
//	$Text = preg_replace("/\[li\](.*?)\[\/li\]/s", '<li>$1</li>' ,$Text);

//	$Text = preg_replace("/\[td\](.*?)\[\/td\]/s", '<td>$1</td>' ,$Text);
//	$Text = preg_replace("/\[tr\](.*?)\[\/tr\]/s", '<tr>$1</tr>' ,$Text);
//	$Text = preg_replace("/\[table\](.*?)\[\/table\]/s", '<table>$1</table>' ,$Text);

//	$Text = preg_replace("/\[table border=1\](.*?)\[\/table\]/s", '<table border="1" >$1</table>' ,$Text);
//	$Text = preg_replace("/\[table border=0\](.*?)\[\/table\]/s", '<table border="0" >$1</table>' ,$Text);

	
//	$Text = str_replace("[*]", "<li>", $Text);

	// Check for font change text
//	$Text = preg_replace("(\[font=(.*?)\](.*?)\[\/font\])","<span style=\"font-family: $1;\">$2</span>",$Text);


    $Text = preg_replace_callback("/\[code\](.*?)\[\/code\]/is",'stripdcode_br_cb',$Text);

	// Check for [code] text
	$Text = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/is","\t$2\n", $Text);




	// Declare the format for [quote] layout
	//	$QuoteLayout = '<blockquote>$1</blockquote>';                     
	// Check for [quote] text
	$Text = preg_replace("/\[quote\](.*?)\[\/quote\]/is",">$1\n\n", $Text);
         
	// Images

	// html5 video and audio

	$Text = preg_replace("/\[video\](.*?)\[\/video\]/", '$1', $Text);

	$Text = preg_replace("/\[audio\](.*?)\[\/audio\]/", '$1', $Text);

//	$Text = preg_replace("/\[iframe\](.*?)\[\/iframe\]/", '<iframe src="$1" width="425" height="350"><a href="$1">$1</a></iframe>', $Text);
         
	// [img=widthxheight]image source[/img]
//	$Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/", '<img src="$3" style="height:{$2}px; width:{$1}px;" >', $Text);

    $Text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text); 
    $Text = preg_replace("/\[youtube\]https?:\/\/www.youtube.com\/embed\/(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text); 
    $Text = preg_replace("/\[youtube\]https?:\/\/youtu.be\/(.*?)\[\/youtube\]/ism",'http://www.youtube.com/watch?v=$1',$Text); 
	$Text = preg_replace("/\[youtube\]([A-Za-z0-9\-_=]+)(.*?)\[\/youtube\]/ism", 'http://www.youtube.com/watch?v=$1', $Text);

	$Text = preg_replace("/\[vimeo\]https?:\/\/player.vimeo.com\/video\/([0-9]+)(.*?)\[\/vimeo\]/ism",'http://vimeo.com/$1',$Text); 
	$Text = preg_replace("/\[vimeo\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/vimeo\]/ism",'http://vimeo.com/$1',$Text); 
	$Text = preg_replace("/\[vimeo\]([0-9]+)(.*?)\[\/vimeo\]/ism", 'http://vimeo.com/$1',$Text);




	// oembed tag
	//	$Text = oembed_bbcode2html($Text);

	// If we found an event earlier, strip out all the event code and replace with a reformatted version.

	if(x($ev,'desc') && x($ev,'start')) {

		$sub = format_event_diaspora($ev);
	
		$Text = preg_replace("/\[event\-description\](.*?)\[\/event\-description\]/is",$sub,$Text);
		$Text = preg_replace("/\[event\-start\](.*?)\[\/event\-start\]/is",'',$Text);
		$Text = preg_replace("/\[event\-finish\](.*?)\[\/event\-finish\]/is",'',$Text);
		$Text = preg_replace("/\[event\-location\](.*?)\[\/event\-location\]/is",'',$Text);
		$Text = preg_replace("/\[event\-adjust\](.*?)\[\/event\-adjust\]/is",'',$Text);
	}

	$Text = preg_replace("/\<(.*?)(src|href)=(.*?)\&amp\;(.*?)\>/ism",'<$1$2=$3&$4>',$Text);

	$Text = preg_replace('/\[(.*?)\]\((.*?)\\\\_(.*?)\)/ism','[$1]($2_$3)',$Text);
	
	call_hooks('bb2diaspora',$Text);

	return $Text;
}

function format_event_diaspora($ev) {

	$a = get_app();

	if(! ((is_array($ev)) && count($ev)))
		return '';

	$bd_format = t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM

	$o = 'Friendika event notification:' . "\n";

	$o .= '**' . bb2diaspora($ev['desc']) .  '**' . "\n";

	$o .= t('Starts:') . ' ' . '['
		. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC', 
			$ev['start'] , $bd_format ))
			:  day_translate(datetime_convert('UTC', 'UTC', 
			$ev['start'] , $bd_format)))
		.  '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['start'])) . ")\n";

	if(! $ev['nofinish'])
		$o .= t('Finishes:') . ' ' . '[' 
			. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC', 
				$ev['finish'] , $bd_format ))
				:  day_translate(datetime_convert('UTC', 'UTC', 
				$ev['finish'] , $bd_format )))
			. '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['finish'])) . ")\n";

	if(strlen($ev['location']))
		$o .= t('Location:') . bb2diaspora($ev['location']) 
			. "\n";

	$o .= "\n";
	return $o;
}