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<?php
// The PHP half of the Throw frame's exception codec. A Rust-side failure carries the class it
// was thrown as, so `catch (TransportException $e)` in plugin code catches what it would catch
// under Composer, plus the state that class declares beyond message and code.
namespace Shirabe;
final class MaterializedThrowable
{
/**
* Rebuilds the exception a Throw frame describes. A class the child cannot construct from a
* message and a code keeps the RuntimeException shape, which is all the frame guarantees.
*
* @param array<string, mixed> $properties
*/
public static function revive(string $class, string $message, int $code, array $properties): \Throwable
{
$exception = self::instantiate($class, $message, $code);
foreach ($properties as $name => $value) {
// A name the class does not declare is a Shirabe bug rather than a plugin one, and
// ReflectionProperty reports it as such instead of dropping the state silently.
$property = new \ReflectionProperty($exception, $name);
$property->setAccessible(true);
$property->setValue($exception, $value);
}
return $exception;
}
private static function instantiate(string $class, string $message, int $code): \Throwable
{
if ($class === '' || !class_exists($class) || !is_a($class, \Throwable::class, true)) {
return new \RuntimeException($message, $code);
}
$constructor = (new \ReflectionClass($class))->getConstructor();
if ($constructor === null || !self::acceptsMessageAndCode($constructor)) {
return new \RuntimeException($message, $code);
}
return new $class($message, $code);
}
/**
* Whether the constructor has \Exception's shape as far as the frame fills it in: a string
* message, an int code, and nothing else required.
*/
private static function acceptsMessageAndCode(\ReflectionMethod $constructor): bool
{
$parameters = $constructor->getParameters();
if (count($parameters) < 2) {
return false;
}
foreach ($parameters as $position => $parameter) {
$type = $parameter->getType();
$name = $type instanceof \ReflectionNamedType ? $type->getName() : null;
if ($position === 0 && $name !== 'string') {
return false;
}
if ($position === 1 && $name !== 'int') {
return false;
}
if ($position >= 2 && !$parameter->isOptional()) {
return false;
}
}
return true;
}
}
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