Format Content automatically (linebreaks or even wiki formatting)

//Simple (yet hopefully elegant) formatting function.
function formatColumns($string) {
	$patterns = array(
		"left" => "#\<\<(.*?)\<\<#is",
		"right" => "#\>\>(.*?)\>\>#is"
	);
 
	$replacements = array(
		"left" => "<div class=\"LeftC\">$1\n</div>",
		"right" => "<div class=\"RightC\">$1\n</div>"
	);
 
	return preg_replace($patterns, $replacements, $string);
}	

function formatLine($string) {
	$patterns = array(
		"li" => "#^[\*\#\>](.*)$#s",
		"h4" => "#^\=\=\=\=(.*?)\=\=\=\=#is",
		"h3" => "#^\=\=\=(.*?)\=\=\=#is",
		"h2" => "#^\=\=(.*?)\=\=#is",
		"bold" => "#\'\'\'(.*?)\'\'\'#is",
		"italics" => "#\'\'(.*?)\'\'#is",
		"underline" => "#\_\_(.*?)\_\_#is",
		"link" => "#\-\-(.*?)\|(.*?)\-\-#i",
		"img" => "#img\=(.*?)\|center\=#i",
		"img" => "#img\=(.*?)\|(.*?)\=#i",
	);
 
	$replacements = array(
		"li" => "<li>$1</li>",
		"h4" => "<h4>$1</h4>",
		"h3" => "<h3>$1</h3>",
		"h2" => "<h2>$1</h2>",
		"bold" => "<b>$1</b>",
		"italics" => "<i>$1</i>",
		"underline" => "<u>$1</u>",
		"link" => "<a href=\"$1\">$2</a>",
		"img" => "<div style=\"text-align: center;\"><img src=\"assets/images/$1\" ></div>",
		"img" => "<img src=\"assets/images/$1\" style=\"float: $2;\" >",
	);
 
	return preg_replace($patterns, $replacements, $string);
}	


//Main formatting function, added to the main for use in other functions.
function formatContent($content) {
	//Remove windows linebreaks.
	$content = str_replace("\r", '', $content);
	
	//Add column divs.
	$content = formatColumns($content);
	
	//Split the content into natural lines.
	$lines = split("\n", $content);
	
	//To make sure the source looks nice as well. (and not all on one line)
	$ln = "\n";
	
	$result = '';
	$cur = '';
	$open = false;
	$ignore = '!'; //Ignore character.
	
	$ul = false;
	$sl = false;
	$ol = false;
	$td = false;
	$th = false;
	$table = false;

	$special = '^(\!|\img\=|\=\=|\*|\#|\<|\>)';
	
	//This little loop creates <p> tags around paragraphs and adds <br /> tags where lines do not have an empty line in between. Very simple.
	foreach ($lines as $line) {
		$prev = $cur;
		$cur = trim($line);
		//Table stuff.
		$table = false;
		if (substr($cur, 0, 1) == '|') {
			$table = true;
			$cur = substr($cur, 1);
			if ($td) {
				$result .= '</td>';
				$td = false;
			}
			if ($th) {
				$result .= '</th>';
				$th = false;
			}
			switch (substr($cur, 0, 1)) {
				case '{':
					$cur = substr($cur, 1);
					$class = (empty($cur)) ? 'Normal' : $cur;
					$result .= '<table class="'.$class.'"><tr>';
					$cur = '';
				break;
				case '}':
					$result .= '</tr></table>';
					$cur = '';
				break;
				case '-':
					$result .= '</tr><tr>'; 
					$cur = '';
				break;
				case '|': 
					$result .= '<th>';
					$th = true;
					$cur = substr($cur, 1);
				break;
				case '(': 
					$result .= '<td class="Dot">';
					$td = true;
					$cur = substr($cur, 1);
				break;
				default: //Standard table data.
					$result .= '<td>';
					$td = true;
				break;
			}			

		}
		
		
		//If the sentence starts with the ignore marker.		
		if (ereg($special,$cur)) {
			switch (substr($cur, 0, 1)) {
				case '#':
					if (!$ol) {
						$ol = true;
						$result .= '<ol>'.$ln;
					}
					$result .= formatLine($cur); 
				break;
				case '*':
					if (!$ul) {
						$ul = true;
						$result .= '<ul>'.$ln;
					}
					$result .= formatLine($cur); 
				break;
				case '>':
					if (!$sl) {
						$sl = true;
						$result .= '<ul class="Special">'.$ln;
					}
					$result .= formatLine($cur); 
				break;
				case '=': 
					$result .= formatLine($cur); 
					$prev = ''; //Force start of a new paragraph.
				break;
				default: //Ignored.
					$cur = (substr($cur, 0, 1) == '!') ? substr($cur, 1) : $cur;
					$result .= formatLine($cur);
				break;
			}			
			$result .= $ln;
			$cur = $prev;
		} else {
			if ($ul) {
				$result .= '</ul>'.$ln;
				$ul = false;
			}
			if ($sl) {
				$result .= '</ul>'.$ln;
				$sl = false;
			}
			if ($ol) {
				$result .= '</ol>'.$ln;
				$ol = false;
			}
			
			if (!empty($cur)) $result .= formatLine($cur);
			if (!$table) $result .= '<br />'.$ln;
		}
	}
	if ($ul) $result .= '</ul>'.$ln;
	if ($sl) $result .= '</ul>'.$ln;
	if ($ol) $result .= '</ol>'.$ln;
	if ($open) $result .= '</p>'.$ln;

	return $result;
}

/*  FORMAT plugin
* Formats text properly with <p> and <br /> tags.
* Set to use the Sytem Event -> OnLoadWebDocument
*/
$template = $modx->documentObject['template'];
//Filter out blank templates, as they have different content and shouldn't be formatted.
if ($template > -1) {
	//Get the document content from MODX
	$content = $modx->documentObject['content'];
	
	$result = formatContent($content);
	
	//Put the modified content back to MODX.
	$modx->documentObject['content'] = $result;
}