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<?php
declare(strict_types=1);
namespace Lightscale\Router;
use Lightscale\Router\Enums\HttpMethod;
use Lightscale\Router\Enums\PathSegmentType;
use Lightscale\Router\Exceptions\NotFoundException;
use Lightscale\Router\Exceptions\UnknownMethodException;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
class Router
{
private PathSegment $root;
public function __construct()
{
$this->root = new PathSegment(type: PathSegmentType::Root);
}
public function root(): PathSegment
{
return $this->root;
}
/** @return string[] */
private function splitPath(string $path): array
{
$split = explode('/', rtrim($path, '/'));
array_shift($split);
return $split;
}
public function findSegment(string $path): ?PathSegmentMatch
{
$pathSplit = $this->splitPath($path);
$seg = $this->root();
$params = [];
while (($v = array_shift($pathSplit)) !== null && null !== $seg) {
$seg = $seg->findChild($v);
if (PathSegmentType::Parameter === $seg?->getType()) {
$params[$seg->getValue() ?? ''] = $v;
}
}
return null === $seg ? null : new PathSegmentMatch(
segment: $seg,
parameters: $params
);
}
public function dispatch(RequestInterface $request): ResponseInterface
{
$uri = $request->getUri();
$match = $this->findSegment($uri->getPath());
if (null === $match) {
throw new NotFoundException();
}
$segment = $match->segment;
$method = $request->getMethod();
$method = (
HttpMethod::tryFrom(strtolower($method)) ??
throw new UnknownMethodException()
);
$route = $segment->getRoute($method);
if (null === $route) {
throw new NotFoundException();
}
return $route($request);
}
}
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