Using symfony2 routing component (outside of symfony2) - symfony

Question

I've been searching and haven't really found much useful information. I'm looking to use the symfony2 routing component (and also yaml component) with my own personal framework but haven't found any documentation on basic setup. The documentation on the symfony site does a good job of explaining how to use the component but not much in the way of standalone setup.
Can anyone recommend a good place to start that could explain how to setup individual symfony2 components?

Answer 1

I ended up looking at the documentation on the symfony site, as well as the source code on github (Route.php, RouteCollection.php, RouteCompiler.php) and came up with my own basic router.
Just like symfony, I allow 4 arguments to be passed to the route class -> 1) the pattern, 2) the default controller/action, 3) regex requirements for each variable in the pattern, and 4) any options - I haven't coded for this yet as it's not in my requirements.
My main/front controller (index.php) only talks to the static Router class which has access to the other route classes in the lib\route namespace.
Router::Map basically compiles a regex string (along with default controller/action and variable names) that gets passed to the compiledRouteCollection which is used in Router::_Process to match the httpRequest against. From there, if there is a match in the process method then i set the controller/action/args based on the values of the matched compiledRoute default controller/action. If there is not a preg_match then i use the default controller/action/args from the request object. The rest is cake...
I hope someone finds this useful and it's able to save them the time I spent today working on this. Cheers!
index.php
require_once 'config/config.php';
require_once 'lib/autoload.php';
lib\Router::Map(
'users_username_id',
'users/{username}/{id}',
array('controller' => 'testController', 'action' => 'users')
);
lib\Router::Route(new lib\Request());
router.php
namespace lib;
class Router {
protected static $_controller;
protected static $_action;
protected static $_args;
protected static $_compiledRouteCollection;
private static $_instance;
private function __construct() {
self::$_compiledRouteCollection = new \lib\route\CompiledRouteCollection();
}
public static function Singleton() {
if(!isset(self::$_instance)) {
$className = __CLASS__;
self::$_instance = new $className;
}
return self::$_instance;
}
public static function Route(Request $request, $resetProperties = false) {
self::Singleton();
self::_Process($request,$resetProperties);
$className = '\\app\\controllers\\' . self::$_controller;
if(class_exists($className, true)) {
self::$_controller = new $className;
if(is_callable(array(self::$_controller, self::$_action))) {
if(!empty(self::$_args)) {
call_user_func_array(array(self::$_controller, self::$_action), self::$_args);
} else {
call_user_func(array(self::$_controller, self::$_action));
}
return;
}
}
self::Route(new \lib\Request('error'),true);
}
public static function Map($name, $pattern, array $defaults, array $requirements = array(), array $options = array()) {
self::Singleton();
$route = new \lib\route\Route($pattern,$defaults,$requirements,$options);
$compiledRoute = $route->Compile();
self::$_compiledRouteCollection->Add($name,$compiledRoute);
}
private static function _Process(Request $request, $resetProperties = false) {
$routes = array();
$routes = self::$_compiledRouteCollection->routes;
foreach($routes as $route) {
preg_match($route[0]['regex'], $request->GetRequest(), $matches);
if(count($matches)) {
array_shift($matches);
$args = array();
foreach($route[0]['variables'] as $variable) {
$args[$variable] = array_shift($matches);
}
self::$_controller = (!isset(self::$_controller) || $resetProperties) ? $route[0]['defaults']['controller'] : self::$_controller;
self::$_action = (!isset(self::$_action) || $resetProperties) ? $route[0]['defaults']['action'] : self::$_action;
self::$_args = (!isset(self::$_args) || $resetProperties) ? $args : self::$_args;
return;
}
}
self::$_controller = (!isset(self::$_controller) || $resetProperties) ? $request->GetController() : self::$_controller;
self::$_action = (!isset(self::$_action) || $resetProperties) ? $request->GetAction() : self::$_action;
self::$_args = (!isset(self::$_args) || $resetProperties) ? $request->GetArgs() : self::$_args;
}
}
request.php
namespace lib;
class Request {
protected $_controller;
protected $_action;
protected $_args;
protected $_request;
public function __construct($urlPath = null) {
$this->_request = $urlPath !== null ? $urlPath : $_SERVER['REQUEST_URI'];
$parts = explode('/', $urlPath !== null ? $urlPath : $_SERVER['REQUEST_URI']);
$parts = array_filter($parts);
$this->_controller = (($c = array_shift($parts)) ? $c : 'index').'Controller';
$this->_action = ($c = array_shift($parts)) ? $c : 'index';
$this->_args = (isset($parts[0])) ? $parts : array();
}
public function GetRequest() {
return $this->_request;
}
public function GetController() {
return $this->_controller;
}
public function GetAction() {
return $this->_action;
}
public function GetArgs() {
return $this->_args;
}
}
route.php
namespace lib\route;
class Route {
private $_pattern;
private $_defaults;
private $_requirements;
public $_options;
public function __construct($pattern, array $defaults = array(), array $requirements = array(), array $options = array()) {
$this->SetPattern($pattern);
$this->SetDefaults($defaults);
$this->SetRequirements($requirements);
$this->SetOptions($options);
}
public function SetPattern($pattern) {
$this->_pattern = trim($pattern);
if($this->_pattern[0] !== '/' || empty($this->_pattern)) {
$this->_pattern = '/'.$this->_pattern;
}
}
public function GetPattern() {
return $this->_pattern;
}
public function SetDefaults(array $defaults) {
$this->_defaults = $defaults;
}
public function GetDefaults() {
return $this->_defaults;
}
public function SetRequirements(array $requirements) {
$this->_requirements = array();
foreach($requirements as $key => $value) {
$this->_requirements[$key] = $this->_SanitizeRequirement($key,$value);
}
}
public function GetRequirements() {
return $this->_requirements;
}
public function SetOptions(array $options) {
$this->_options = array_merge(
array('compiler_class' => 'lib\\route\\RouteCompiler'),
$options
);
}
public function GetOptions() {
return $this->_options;
}
public function GetOption($name) {
return isset($this->_options[$name]) ? $this->_options[$name] : null;
}
private function _SanitizeRequirement($key, $regex) {
if($regex[0] == '^') {
$regex = substr($regex, 1);
}
if(substr($regex, -1) == '$') {
$regex = substr($regex,0,-1);
}
return $regex;
}
public function Compile() {
$className = $this->GetOption('compiler_class');
$routeCompiler = new $className;
$compiledRoute = array();
$compiledRoute = $routeCompiler->Compile($this);
return $compiledRoute;
}
}
routeCompiler.php
namespace lib\route;
class RouteCompiler {
//'#\/tellme\/users\/[\w\d_]+\/[\w\d_]+#'
public function Compile(Route $route) {
$pattern = $route->GetPattern();
$requirements = $route->GetRequirements();
$options = $route->GetOptions();
$defaults = $route->GetDefaults();
$len = strlen($pattern);
$tokens = array();
$variables = array();
$pos = 0;
$regex = '#';
preg_match_all('#.\{([\w\d_]+)\}#', $pattern, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
if(count($matches)) {
foreach($matches as $match) {
if($text = substr($pattern, $pos, $match[0][1] - $pos)) {
$regex .= str_replace('/', '\/', $text).'\/';
}
if($var = $match[1][0]) {
if(isset($requirements[$var])) {
$regex .= '('.$requirements[$var].')\/';
} else {
$regex .= '([\w\d_]+)\/';
}
$variables[] = $match[1][0];
}
$pos = $match[0][1] + strlen($match[0][0]);
}
$regex = rtrim($regex,'\/').'#';
} else {
$regex .= str_replace('/', '\/', $pattern).'#';
}
$tokens[] = array(
'regex' => $regex,
'variables' => $variables,
'defaults' => $defaults
);
return $tokens;
}
}
compiledRouteCollection.php
namespace lib\route;
class CompiledRouteCollection {
public $routes;
public function __construct() {
$this->routes = array();
}
public function Add($name, array $route) {
$this->routes[$name] = $route;
}
}