Replacement for parseRoute function

base.php

	protected function parseRoute($route)
	{
		// Initialize variables.
		$controller = false;

		// Sanitize and explode the route.
		$route = trim(parse_url($route, PHP_URL_PATH), ' /');

		// If the route is empty then simply return the default route.  No parsing necessary.
		if ($route == '')
		{
			return $this->default;
		}

		// Iterate through all of the known route maps looking for a match.
		foreach ($this->maps as $pattern => $name)
		{
			// Reset the route variables each time.  Cleanliness is next to buglessness ... or something. :-)
			$vars = array();

			// Sanitize and explode the pattern.
			$pattern = explode('/', trim(parse_url($pattern, PHP_URL_PATH), ' /'));

			$regex = array();
			$i = 0;
			foreach ($pattern as $segment)
			{
				if ($segment == '*')
				{
					$regex[] = '.*';
				}
				elseif ($segment == '\\*')
				{
					$regex[] = '/';
					$regex[] = '\\*';
				}
				elseif ($segment == ':')
				{
					$regex[] = '/';
					$regex[] = '[^/]*';
				}
				elseif ($segment[0] == ':')
				{
					$i++;
					$vars[substr($segment, 1)] = $i;
					$regex[] = '/';
					$regex[] = '([^/]*)';
				}
				elseif ($segment[0] == '\\' && $segment[1] == ':')
				{
					$regex[] = '/';
					$regex[] = quotemeta(substr($segment, 1));
				}
				else
				{
					$regex[] = '/';
					$regex[] = quotemeta($segment);
				}
			}
			if ($regex[0] == '/')
			{
				$regex = array_slice($regex, 1);
			}
			if (preg_match(chr(1) . '^' . implode($regex) .'$' . chr(1), $route, $matches))
			{
				// If we have gotten this far then we have a positive match.
				$controller = $name;

				// Time to set the input variables.
				// We are only going to set them if they don't already exist to avoid overwriting things.
				foreach ($vars as $k => $i)
				{
					$this->input->def($k, $matches[$i]);

					// Don't forget to do an explicit set on the GET superglobal.
					$this->input->get->def($k, $matches[$i]);
				}

				break;
			}
		}

		// We were unable to find a route match for the request.  Panic.
		if (!$controller)
		{
			throw new InvalidArgumentException(sprintf('Unable to handle request for route `%s`.', $route), 404);
		}

		return $controller;
	}