* @license https://www.gnu.org/licenses/agpl-3.0.en.html/ GNU Affero General Public License v3.0
*/
namespace App\Helpers;
class Bbcode
{
private array $parsers = [
'h1' => [
'openBbcode' => '/^\[h1\]/i',
'closeBbcode' => '[/h1]',
'openHtml' => '',
'closeHtml' => '
',
],
'h2' => [
'openBbcode' => '/^\[h2\]/i',
'closeBbcode' => '[/h2]',
'openHtml' => '',
'closeHtml' => '
',
],
'h3' => [
'openBbcode' => '/^\[h3\]/i',
'closeBbcode' => '[/h3]',
'openHtml' => '',
'closeHtml' => '
',
],
'h4' => [
'openBbcode' => '/^\[h4\]/i',
'closeBbcode' => '[/h4]',
'openHtml' => '',
'closeHtml' => '
',
],
'h5' => [
'openBbcode' => '/^\[h5\]/i',
'closeBbcode' => '[/h5]',
'openHtml' => '',
'closeHtml' => '
',
],
'h6' => [
'openBbcode' => '/^\[h6\]/i',
'closeBbcode' => '[/h6]',
'openHtml' => '',
'closeHtml' => '
',
],
'bold' => [
'openBbcode' => '/^\[b\]/i',
'closeBbcode' => '[/b]',
'openHtml' => '',
'closeHtml' => '',
],
'italic' => [
'openBbcode' => '/^\[i\]/i',
'closeBbcode' => '[/i]',
'openHtml' => '',
'closeHtml' => '',
],
'underline' => [
'openBbcode' => '/^\[u\]/i',
'closeBbcode' => '[/u]',
'openHtml' => '',
'closeHtml' => '',
],
'linethrough' => [
'openBbcode' => '/^\[s\]/i',
'closeBbcode' => '[/s]',
'openHtml' => '',
'closeHtml' => '',
],
'size' => [
'openBbcode' => '/^\[size=(\d+)\]/i',
'closeBbcode' => '[/size]',
'openHtml' => '',
'closeHtml' => '',
],
'font' => [
'openBbcode' => '/^\[font=([a-z0-9 ]+)\]/i',
'closeBbcode' => '[/font]',
'openHtml' => '',
'closeHtml' => '',
],
'color' => [
'openBbcode' => '/^\[color=(\#[a-f0-9]{3,4}|\#[a-f0-9]{6}|\#[a-f0-9]{8}|[a-z]+)\]/i',
'closeBbcode' => '[/color]',
'openHtml' => '',
'closeHtml' => '',
],
'center' => [
'openBbcode' => '/^\[center\]/i',
'closeBbcode' => '[/center]',
'openHtml' => '',
'closeHtml' => '
',
],
'left' => [
'openBbcode' => '/^\[left\]/i',
'closeBbcode' => '[/left]',
'openHtml' => '',
'closeHtml' => '
',
],
'right' => [
'openBbcode' => '/^\[right\]/i',
'closeBbcode' => '[/right]',
'openHtml' => '',
'closeHtml' => '
',
],
'quote' => [
'openBbcode' => '/^\[quote\]/i',
'closeBbcode' => '[/quote]',
'openHtml' => '',
'closeHtml' => '
',
],
'namedquote' => [
'openBbcode' => '/^\[quote=([^<>"]*?)\]/i',
'closeBbcode' => '[/quote]',
'openHtml' => ' Quoting $1:',
'closeHtml' => '
',
],
'namedlink' => [
'openBbcode' => '/^\[url=(.*?)\]/i',
'closeBbcode' => '[/url]',
'openHtml' => '',
'closeHtml' => '',
],
'orderedlistnumerical' => [
'openBbcode' => '/^\[list=1\]/i',
'closeBbcode' => '[/list]',
'openHtml' => '',
'closeHtml' => '
',
],
'orderedlistalpha' => [
'openBbcode' => '/^\[list=a\]/i',
'closeBbcode' => '[/list]',
'openHtml' => '',
'closeHtml' => '
',
],
'unorderedlist' => [
'openBbcode' => '/^\[list\]/i',
'closeBbcode' => '[/list]',
'openHtml' => '',
],
'code' => [
'openBbcode' => '/^\[code\]/i',
'closeBbcode' => '[/code]',
'openHtml' => '',
'closeHtml' => '',
],
'alert' => [
'openBbcode' => '/^\[alert\]/i',
'closeBbcode' => '[/alert]',
'openHtml' => '',
'closeHtml' => '
',
],
'note' => [
'openBbcode' => '/^\[note\]/i',
'closeBbcode' => '[/note]',
'openHtml' => '',
'closeHtml' => '
',
],
'sub' => [
'openBbcode' => '/^\[sub\]/i',
'closeBbcode' => '[/sub]',
'openHtml' => '',
'closeHtml' => '',
],
'sup' => [
'openBbcode' => '/^\[sup\]/i',
'closeBbcode' => '[/sup]',
'openHtml' => '',
'closeHtml' => '',
],
'small' => [
'openBbcode' => '/^\[small\]/i',
'closeBbcode' => '[/small]',
'openHtml' => '',
'closeHtml' => '',
],
'table' => [
'openBbcode' => '/^\[table\]/i',
'closeBbcode' => '[/table]',
'openHtml' => '',
],
'table-row' => [
'openBbcode' => '/^\[tr\]/i',
'closeBbcode' => '[/tr]',
'openHtml' => '',
'closeHtml' => '
',
],
'table-data' => [
'openBbcode' => '/^\[td\]/i',
'closeBbcode' => '[/td]',
'openHtml' => '',
'closeHtml' => ' | ',
],
'spoiler' => [
'openBbcode' => '/^\[spoiler\]/i',
'closeBbcode' => '[/spoiler]',
'openHtml' => 'Spoiler
',
'closeHtml' => '
$1
',
'closeHtml' => '
.')
',
$source
);
$source = preg_replace_callback(
'/\[img width=(\d+)\](.*?)\[\/img\]/i',
fn ($matches) => '.')
',
$source
);
$source = preg_replace_callback(
'/\[img=(\d+)(?:x\d+)?\](.*?)\[\/img\]/i',
fn ($matches) => '',
$source
);
// Youtube elements need to be replaced like this because the content inside the two tags
// has to be moved into an html attribute
$source = preg_replace_callback(
'/\[youtube\](.*?)\[\/youtube\]/i',
fn ($matches) => '',
$source
);
$source = preg_replace_callback(
'/\[video\](.*?)\[\/video\]/i',
fn ($matches) => '',
$source
);
$source = preg_replace_callback(
'/\[video="youtube"\](.*?)\[\/video\]/i',
fn ($matches) => '',
$source
);
// Common comparison syntax used in other torrent management systems is quite specific
// so it must be done here instead
$source = preg_replace_callback(
'/\[comparison=(.*?)\]\s*(.*?)\s*\[\/comparison\]/is',
function ($matches) {
$comparates = preg_split('/\s*,\s*/', $matches[1]);
$urls = preg_split('/\s*(?:,|\s)\s*/', $matches[2]);
$validatedUrls = collect($urls)->filter(fn ($url) => filter_var($url, FILTER_VALIDATE_URL));
$chunkedUrls = $validatedUrls->chunk(\count($comparates));
$html = view('partials.comparison', ['comparates' => $comparates, 'urls' => $chunkedUrls])->render();
$html = preg_replace('/\s+/', ' ', $html);
return $html;
},
$source
);
// Stack of unclosed elements
$openedElements = [];
// Character index
$index = 0;
// Don't loop more than the length of the source
while ($index < \strlen($source)) {
// Get the next occurrence of `[`
$index = strpos($source, '[', $index);
// Break if there are no more occurrences of `[`
if ($index === false) {
break;
}
// Break if `[` is the last character of the source
if ($index + 1 >= \strlen($source)) {
break;
}
// Is the potential tag opening or closing?
if ($source[$index + 1] === '/' && ! empty($openedElements)) {
$name = array_pop($openedElements);
$el = $this->parsers[$name];
$tag = substr($source, $index, \strlen($el['closeBbcode']));
// Replace bbcode tag with html tag if found tag matches expected tag,
// otherwise return the expected element's to the stack
if (strcasecmp($tag, $el['closeBbcode']) === 0) {
$source = substr_replace($source, $el['closeHtml'], $index, \strlen($el['closeBbcode']));
} else {
$openedElements[] = $name;
}
} else {
$remainingText = substr($source, $index);
// Find match between found bbcode tag and valid elements
foreach ($this->parsers as $name => $el) {
// The opening bbcode tag uses the regex `^` character to make
// sure only the beginning of $remainingText is matched
if (preg_match($el['openBbcode'], $remainingText, $matches) === 1) {
$replacement = preg_replace($el['openBbcode'], $el['openHtml'], $matches[0]);
$source = substr_replace($source, $replacement, $index, \strlen($matches[0]));
$openedElements[] = $name;
break;
}
}
}
$index++;
}
while (! empty($openedElements)) {
$source .= $this->parsers[array_pop($openedElements)]['closeHtml'];
}
if ($replaceLineBreaks) {
// Replace line breaks
$source = str_replace(["\r\n", "\n"], '
', $source);
}
return $source;
}
}