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Router.php
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Router.php
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<?php
namespace Pianissimo\Component\Routing;
use InvalidArgumentException;
use Pianissimo\Component\Routing\Exception\RouteNotFoundException;
class Router implements RouterInterface
{
/**
* @var Route[]|RouteCollection|null
*/
protected $routeCollection;
/**
* @var RouteLoaderInterface[]|array
*/
private $routeLoaders = [];
/**
* Returns the initialized routes.
*/
public function getRouteCollection(): RouteCollection
{
if ($this->routeCollection === null) {
$this->load();
}
return $this->routeCollection;
}
/**
* Adds an RouteLoader to the Router.
*/
public function addLoader(RouteLoaderInterface $routeLoader): self
{
$this->routeLoaders[] = $routeLoader;
return $this;
}
/**
* Executes the RouteLoaders and sets the RouteCollection.
*/
public function load(): void
{
$routes = new RouteCollection();
foreach ($this->routeLoaders as $routeLoader) {
if (!$routeLoader instanceof RouteLoaderInterface) {
throw new InvalidArgumentException(sprintf("Route loader '%s' must implement '%s'", get_class($routeLoader), RouteLoaderInterface::class));
}
$routes->merge($routeLoader->load());
}
$this->routeCollection = $routes;
}
/**
* Returns the Route instance whose paths match or returns null if there are no matches.
*/
public function matchRoute(string $requestPath): ?Route
{
$routes = $this->getRouteCollection();
/** @var Route $route */
foreach ($routes as $route) {
if ($this->equalPaths($route->getPath(), $requestPath)) {
return $route;
}
}
return null;
}
/**
* Returns the Route instance whose names match or returns null if there are no matches.
*/
public function findRoute(string $routeName): ?Route
{
$routes = $this->getRouteCollection();
foreach ($routes as $route) {
if ($route->getName() === $routeName) {
return $route;
}
}
return null;
}
/**
* Returns the Route instance whose names match or throws an exception if there are no matches.
* @throws RouteNotFoundException
*/
public function getRoute(string $routeName): Route
{
$route = $this->findRoute($routeName);
if ($route === null) {
throw new RouteNotFoundException(sprintf("Route with name '%s' not found", $routeName));
}
return $route;
}
/**
* @throws RouteNotFoundException
* @throws InvalidArgumentException
*/
public function generateUrl(string $routeName, array $parameters): string
{
$route = $this->getRoute($routeName);
$routePathParts = array_values(array_filter(explode('/', $route->getPath())));
$resultParts = [];
$usedParameters = [];
foreach ($routePathParts as $routePathPart) {
if ($this->isParameter($routePathPart) === false) {
$resultParts[] = $routePathPart;
continue;
}
$parameterName = str_replace(['{', '}'], [], $routePathPart);
if (array_key_exists($parameterName, $parameters) === false) {
throw new InvalidArgumentException(sprintf("Unable to generate the URL: required parameter '%s' is missing", $parameterName));
}
$resultParts[] = $parameters[$parameterName];
$usedParameters[] = $parameterName;
}
$unusedParameters = array_values(array_diff(array_keys($parameters), $usedParameters));
if (count($unusedParameters) > 0) {
throw new InvalidArgumentException(sprintf("Unable to generate the URL: given parameter '%s' does not exists on route '%s'",
$unusedParameters[0], $routeName));
}
return '/' . implode('/', $resultParts);
}
/**
* Determines whether the route path matches with the requested path.
*/
private function equalPaths(string $routePath, string $requestPath): bool
{
$routePathParts = array_values(array_filter(explode('/', $routePath)));
$requestPathParts = array_values(array_filter(explode('/', $requestPath)));
if (count($requestPathParts) !== count($routePathParts)) {
return false;
}
$match = true;
$count = -1;
foreach ($routePathParts as $routePathPart) {
$count++;
if ($this->isParameter($routePathPart)) {
continue;
}
if ($routePathPart !== $requestPathParts[$count]) {
return false;
}
}
return $match;
}
/**
* Returns true if the given path part is a parameter.
*/
private function isParameter(string $part): bool
{
$firstCharacter = $part[0];
$lastCharacter = substr($part, -1);
return $firstCharacter === '{' && $lastCharacter === '}';
}
}