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