routes with prefixes and suffixes

route.php

<?php defined('SYSPATH') OR die('No direct access allowed.');

class Route extends Kohana_Route {

	protected static $_prefix = array();
	protected static $_suffix = array();

	protected function _patch()
	{
		if ( ! empty(self::$_prefix))
		{
			$this->_uri = self::$_prefix['segments'].$this->_uri;
			$this->_regex = $this->_regex + self::$_prefix['regex'];
			$this->defaults($this->_defaults + self::$_prefix['defaults']);
		}

		if ( ! empty(self::$_suffix))
		{
			$this->_uri = $this->_uri.self::$_suffix['segments'];
			$this->_regex = $this->_regex + self::$_suffix['regex'];
			$this->defaults($this->_defaults + self::$_suffix['defaults']);
		}

		if ( ! empty(self::$_prefix) OR ! empty(self::$_suffix))
		{
			$this->_route_regex = Route::compile($this->_uri, $this->_regex);
		}
		
	}

	public static function prefix($segment, array $regex, array $default = array())
	{
		if (empty(self::$_prefix))
		{
			self::$_prefix = array(
				'segments'  => '',
				'regex'     => array(),
				'defaults'  => array(),
			);
		}

		self::$_prefix['segments'] = self::$_prefix['segments'].$segment;
		self::$_prefix['regex'] = self::$_prefix['regex'] + $regex;
		self::$_prefix['defaults'] = self::$_prefix['defaults'] + $default;
	}

	public static function suffix($segment, array $regex, array $default = array())
	{
		if (empty(self::$_suffix))
		{
			self::$_suffix = array(
				'segments'  => '',
				'regex'     => array(),
				'defaults'  => array(),
			);
		}

		self::$_suffix['segments'] = $segment.self::$_suffix['segments'];
		self::$_suffix['regex'] = self::$_suffix['regex'] + $regex;
		self::$_suffix['defaults'] = self::$_suffix['defaults'] + $default;
	}

	public function __construct($uri = NULL, $regex = NULL)
	{
		if ($uri === NULL)
		{
			// Assume the route is from cache
			return;
		}

		parent::__construct($uri, $regex);

		if ($this->_callback)
		{
			// Skip callback routes
			return;
		}

		// Apply prefixes & suffixes
		$this->_patch();
	}

}

/**
in bootstrap.php:

Route::prefix('(<lang>/)', array('lang' => '[a-z]{2}'));
Route::suffix('(.<format>)', array('format' => '[a-z]+'));

So, ru/welcome/index.html will work for default route.
**/

not work for routes with callbacks or lambdas :(