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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;
/**
* @param string|object|callable $callable class, object, callable
* @deprecated use Closure::fromCallable()
*/
public static function closure($callable, ?string $method = null): \Closure
{
trigger_error(__METHOD__ . '() is deprecated, use Closure::fromCallable().', E_USER_DEPRECATED);
try {
return \Closure::fromCallable($method === null ? $callable : [$callable, $method]);
} catch (\TypeError $e) {
throw new Nette\InvalidArgumentException($e->getMessage());
}
}
/**
* Invokes callback.
* @return mixed
* @deprecated
*/
public static function invoke($callable, ...$args)
{
trigger_error(__METHOD__ . '() is deprecated, use native invoking.', E_USER_DEPRECATED);
self::check($callable);
return $callable(...$args);
}
/**
* Invokes callback with an array of parameters.
* @return mixed
* @deprecated
*/
public static function invokeArgs($callable, array $args = [])
{
trigger_error(__METHOD__ . '() is deprecated, use native invoking.', E_USER_DEPRECATED);
self::check($callable);
return $callable(...$args);
}
/**
* Invokes internal PHP function with own error handler.
* @return mixed
*/
public static function invokeSafe(string $function, array $args, callable $onError)
{
$prev = set_error_handler(function ($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.
* @param mixed $callable
* @return callable
* @throws Nette\InvalidArgumentException
*/
public static function check($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.
* @param mixed $callable
*/
public static function toString($callable): string
{
if ($callable instanceof \Closure) {
$inner = self::unwrap($callable);
return '{closure' . ($inner instanceof \Closure ? '}' : ' ' . self::toString($inner) . '}');
} elseif (is_string($callable) && $callable[0] === "\0") {
return '{lambda}';
} else {
is_callable(is_object($callable) ? [$callable, '__invoke'] : $callable, true, $textual);
return $textual;
}
}
/**
* Returns reflection for method or function used in PHP callback.
* @param callable $callable type check is escalated to ReflectionException
* @return \ReflectionMethod|\ReflectionFunction
* @throws \ReflectionException if callback is not valid
*/
public static function toReflection($callable): \ReflectionFunctionAbstract
{
if ($callable instanceof \Closure) {
$callable = self::unwrap($callable);
}
if (is_string($callable) && strpos($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 $callable): bool
{
return is_array($callable) ? is_string($callable[0]) : is_string($callable);
}
/**
* Unwraps closure created by Closure::fromCallable().
* @return callable|array
*/
public static function unwrap(\Closure $closure)
{
$r = new \ReflectionFunction($closure);
if (substr($r->name, -1) === '}') {
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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