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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
use function is_array, is_object, is_string;
/**
* PHP callable tools.
*/
final class Callback
{
use Nette\StaticClass;
/**
* Invokes internal PHP function with own error handler.
*/
public static function invokeSafe(string $function, array $args, callable $onError): mixed
{
$prev = set_error_handler(function ($severity, $message, $file) use ($onError, &$prev, $function): ?bool {
if ($file === __FILE__) {
$msg = ini_get('html_errors')
? Html::htmlToText($message)
: $message;
$msg = preg_replace("#^$function\\(.*?\\): #", '', $msg);
if ($onError($msg, $severity) !== false) {
return null;
}
}
return $prev ? $prev(...func_get_args()) : false;
});
try {
return $function(...$args);
} finally {
restore_error_handler();
}
}
/**
* Checks that $callable is valid PHP callback. Otherwise throws exception. If the $syntax is set to true, only verifies
* that $callable has a valid structure to be used as a callback, but does not verify if the class or method actually exists.
* @return callable
* @throws Nette\InvalidArgumentException
*/
public static function check(mixed $callable, bool $syntax = false)
{
if (!is_callable($callable, $syntax)) {
throw new Nette\InvalidArgumentException(
$syntax
? 'Given value is not a callable type.'
: sprintf("Callback '%s' is not callable.", self::toString($callable)),
);
}
return $callable;
}
/**
* Converts PHP callback to textual form. Class or method may not exists.
*/
public static function toString(mixed $callable): string
{
if ($callable instanceof \Closure) {
$inner = self::unwrap($callable);
return '{closure' . ($inner instanceof \Closure ? '}' : ' ' . self::toString($inner) . '}');
} else {
is_callable(is_object($callable) ? [$callable, '__invoke'] : $callable, true, $textual);
return $textual;
}
}
/**
* Returns reflection for method or function used in PHP callback.
* @param callable $callable type check is escalated to ReflectionException
* @throws \ReflectionException if callback is not valid
*/
public static function toReflection($callable): \ReflectionMethod|\ReflectionFunction
{
if ($callable instanceof \Closure) {
$callable = self::unwrap($callable);
}
if (is_string($callable) && str_contains($callable, '::')) {
return new \ReflectionMethod($callable);
} elseif (is_array($callable)) {
return new \ReflectionMethod($callable[0], $callable[1]);
} elseif (is_object($callable) && !$callable instanceof \Closure) {
return new \ReflectionMethod($callable, '__invoke');
} else {
return new \ReflectionFunction($callable);
}
}
/**
* Checks whether PHP callback is function or static method.
*/
public static function isStatic(callable $callable): bool
{
return is_string(is_array($callable) ? $callable[0] : $callable);
}
/**
* Unwraps closure created by Closure::fromCallable().
*/
public static function unwrap(\Closure $closure): callable|array
{
$r = new \ReflectionFunction($closure);
if (str_ends_with($r->name, '}')) {
return $closure;
} elseif ($obj = $r->getClosureThis()) {
return [$obj, $r->name];
} elseif ($class = $r->getClosureScopeClass()) {
return [$class->name, $r->name];
} else {
return $r->name;
}
}
}
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