Pastoid

	public static function autop($value) {
		$value = str_replace("\r\n", "\n", $value);
		$value = trim($value);
		$ht = new HtmlTokenizer($value);
		$set = $ht->parse();
		$value = '';
 
		// should never autop ANY content in these items
		$noAutoP = array(
			'pre','blockquote','code','ul'
		);
 
		$blockElements = array(
			'address','blockquote','center','dir','div','dl','fieldset','form',
			'h1','h2','h3','h4','h5','h6','hr','isindex','menu','noframes',
			'noscript','ol','p','pre','table','ul'
		);
 
		$token = $set->current();
		$openP = false;
		do {
 
			if ($openP) {
				if ($token['type'] == HTMLTokenizer::NODE_TYPE_ELEMENT_OPEN && in_array(strtolower($token['name']), $blockElements)) {
					$value .= '</p>';
					$openP = false;
				}
			}
 
			// no-autop, pass them through verbatim
			if ($token['type'] == HTMLTokenizer::NODE_TYPE_ELEMENT_OPEN && in_array(strtolower($token['name']), $noAutoP)) {
				$nestedToken = $token;
				$count = 0;
				do {
					$value .= HtmlTokenSet::token_to_string($nestedToken);
					if (
						($nestedToken['type'] == HTMLTokenizer::NODE_TYPE_ELEMENT_CLOSE
						 && strtolower($nestedToken['name']) == strtolower($token['name'])) // found closing element
					) {
						break;
					}
				} while ($nestedToken = $set->next());
				continue;
			}
 
			// anything that's not a text node should get passed through
			if ($token['type'] != HTMLTokenizer::NODE_TYPE_TEXT) {
				$value .= HtmlTokenSet::token_to_string($token);
				continue;
			}
 
			// if we get this far, token type is text
			$localValue = $token['value'];
			if (strlen($localValue)) {
				// contains newlines:
				if ($openP) {
					$localValue = $localValue;
				} else {
					$localValue = "<p>{$localValue}";
					$openP = true;
				}
 
				$localValue = preg_replace('/\s*(\n\s*){2,}/', "</p><p>", $localValue); // at least two \n in a row (allow whitespace in between)
				$localValue = str_replace("\n", "<br />\n", $localValue); // nl2br
				$localValue = str_replace('</p>', "</p>\n", $localValue); // and replace the line break for legibility
			}
			$value .= $localValue;
		} while ($token = $set->next());
 
		$value = preg_replace('!\s*<p></p>\s*!', "\n", $value); // replace <p></p>
		if ($openP) {
			$value .= '</p>';
		}
 
		return $value;
	}