= \count($callback))) { throw new \TypeError(\sprintf('Argument 1 passed to "%s()" must be a callable or a [Closure, method] lazy-callable, "%s" given.', __METHOD__, \get_debug_type($callback))); } $lazyString = new static(); $lazyString->value = static function () use(&$callback, &$arguments, &$value) : string { if (null !== $arguments) { if (!\is_callable($callback)) { $callback[0] = $callback[0](); $callback[1] = $callback[1] ?? '__invoke'; } $value = $callback(...$arguments); $callback = self::getPrettyName($callback); $arguments = null; } return $value ?? ''; }; return $lazyString; } public static function fromStringable($value) : self { if (!self::isStringable($value)) { throw new \TypeError(\sprintf('Argument 1 passed to "%s()" must be a scalar or a stringable object, "%s" given.', __METHOD__, \get_debug_type($value))); } if (\is_object($value)) { return static::fromCallable([$value, '__toString']); } $lazyString = new static(); $lazyString->value = (string) $value; return $lazyString; } public static final function isStringable($value) : bool { return \is_string($value) || $value instanceof self || (\is_object($value) ? \method_exists($value, '__toString') : \is_scalar($value)); } public static final function resolve($value) : string { return $value; } public function __toString() { if (\is_string($this->value)) { return $this->value; } try { return $this->value = ($this->value)(); } catch (\Throwable $e) { if (\TypeError::class === \get_class($e) && __FILE__ === $e->getFile()) { $type = \explode(', ', $e->getMessage()); $type = \substr(\array_pop($type), 0, -\strlen(' returned')); $r = new \ReflectionFunction($this->value); $callback = $r->getStaticVariables()['callback']; $e = new \TypeError(\sprintf('Return value of %s() passed to %s::fromCallable() must be of the type string, %s returned.', $callback, static::class, $type)); } if (\PHP_VERSION_ID < 70400) { // leverage the ErrorHandler component with graceful fallback when it's not available return \trigger_error($e, \E_USER_ERROR); } throw $e; } } public function __sleep() : array { $this->__toString(); return ['value']; } public function jsonSerialize() : string { return $this->__toString(); } private function __construct() { } private static function getPrettyName(callable $callback) : string { if (\is_string($callback)) { return $callback; } if (\is_array($callback)) { $class = \is_object($callback[0]) ? \get_debug_type($callback[0]) : $callback[0]; $method = $callback[1]; } elseif ($callback instanceof \Closure) { $r = new \ReflectionFunction($callback); if (\str_contains($r->name, '{closure') || !($class = \PHP_VERSION_ID >= 80111 ? $r->getClosureCalledClass() : $r->getClosureScopeClass())) { return $r->name; } $class = $class->name; $method = $r->name; } else { $class = \get_debug_type($callback); $method = '__invoke'; } return $class . '::' . $method; } }