/
LazyString.php
112 lines (93 loc) · 3.5 KB
/
LazyString.php
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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\DependencyInjection;
/**
* A string whose value is computed lazily by a callback.
*
* @author Nicolas Grekas <p@tchwork.com>
*/
class LazyString
{
private $value;
/**
* @param callable $callback A callable or a [Closure, method] lazy-callable
*
* @return static
*/
public static function fromCallable($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__, \gettype($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 $lazyString;
}
public function __toString()
{
if (\is_string($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;
}
}
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_class($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 {
$class = \get_class($callback);
$method = '__invoke';
}
if (isset($class[15]) && "\0" === $class[15] && 0 === strpos($class, "class@anonymous\x00")) {
$class = get_parent_class($class).'@anonymous';
}
return $class.'::'.$method;
}
}