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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\String;

/**
 * A string whose value is computed lazily by a callback.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
class LazyString implements \Stringable, \JsonSerializable
{
    private $value;

/**
     * @param callable|array $callback A callable or a [Closure, method] lazy-callable
     *
     * @return static
     */
    public static function fromCallable($callback, ...$arguments): self
    {
        if (!\is_callable($callback) && !(\is_array($callback) && isset($callback[0]) && $callback[0] instanceof \Closure && 2 >= \count($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;
    }

/**
     * @param string|int|float|bool|\Stringable $value
     *
     * @return static
     */
    public static function fromStringable($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;
    }

/**
     * Tells whether the provided value can be cast to string.
     */
    final public static function isStringable($value): bool
    {
        return \is_string($value) || $value instanceof self || (\is_object($value) ? method_exists($value, '__toString') : is_scalar($value));
    }

/**
     * Casts scalars and stringable objects to strings.
     *
     * @param object|string|int|float|bool $value
     *
     * @throws \TypeError When the provided value is not stringable
     */
    final public static function resolve($value): string
    {
        return $value;
    }

/**
     * @return string
     */
    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 (false !== strpos($r->name, '{closure}') || !$class = $r->getClosureScopeClass()) {
                return $r->name;
            }

$class = $class->name;
            $method = $r->name;
        } else {
            $class = get_debug_type($callback);
            $method = '__invoke';
        }

return $class.'::'.$method;
    }
}