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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\Debug\FatalErrorHandler;
use Composer\Autoload\ClassLoader as ComposerClassLoader;
use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
use Symfony\Component\Debug\DebugClassLoader;
use Symfony\Component\Debug\Exception\ClassNotFoundException;
use Symfony\Component\Debug\Exception\FatalErrorException;
/**
* ErrorHandler for classes that do not exist.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
{
/**
* {@inheritdoc}
*/
public function handleError(array $error, FatalErrorException $exception)
{
$messageLen = \strlen($error['message']);
$notFoundSuffix = '\' not found';
$notFoundSuffixLen = \strlen($notFoundSuffix);
if ($notFoundSuffixLen > $messageLen) {
return;
}
if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
return;
}
foreach (['class', 'interface', 'trait'] as $typeName) {
$prefix = ucfirst($typeName).' \'';
$prefixLen = \strlen($prefix);
if (0 !== strpos($error['message'], $prefix)) {
continue;
}
$fullyQualifiedClassName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedClassName, '\\')) {
$className = substr($fullyQualifiedClassName, $namespaceSeparatorIndex + 1);
$namespacePrefix = substr($fullyQualifiedClassName, 0, $namespaceSeparatorIndex);
$message = sprintf('Attempted to load %s "%s" from namespace "%s".', $typeName, $className, $namespacePrefix);
$tail = ' for another namespace?';
} else {
$className = $fullyQualifiedClassName;
$message = sprintf('Attempted to load %s "%s" from the global namespace.', $typeName, $className);
$tail = '?';
}
if ($candidates = $this->getClassCandidates($className)) {
$tail = array_pop($candidates).'"?';
if ($candidates) {
$tail = ' for e.g. "'.implode('", "', $candidates).'" or "'.$tail;
} else {
$tail = ' for "'.$tail;
}
}
$message .= "\nDid you forget a \"use\" statement".$tail;
return new ClassNotFoundException($message, $exception);
}
}
/**
* Tries to guess the full namespace for a given class name.
*
* By default, it looks for PSR-0 and PSR-4 classes registered via a Symfony or a Composer
* autoloader (that should cover all common cases).
*
* @param string $class A class name (without its namespace)
*
* @return array An array of possible fully qualified class names
*/
private function getClassCandidates(string $class): array
{
if (!\is_array($functions = spl_autoload_functions())) {
return [];
}
// find Symfony and Composer autoloaders
$classes = [];
foreach ($functions as $function) {
if (!\is_array($function)) {
continue;
}
// get class loaders wrapped by DebugClassLoader
if ($function[0] instanceof DebugClassLoader) {
$function = $function[0]->getClassLoader();
if (!\is_array($function)) {
continue;
}
}
if ($function[0] instanceof ComposerClassLoader || $function[0] instanceof SymfonyClassLoader) {
foreach ($function[0]->getPrefixes() as $prefix => $paths) {
foreach ($paths as $path) {
$classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
}
}
}
if ($function[0] instanceof ComposerClassLoader) {
foreach ($function[0]->getPrefixesPsr4() as $prefix => $paths) {
foreach ($paths as $path) {
$classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
}
}
}
}
return array_unique($classes);
}
private function findClassInPath(string $path, string $class, string $prefix): array
{
if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.\dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
return [];
}
$classes = [];
$filename = $class.'.php';
foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($path, \RecursiveDirectoryIterator::SKIP_DOTS), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
if ($filename == $file->getFileName() && $class = $this->convertFileToClass($path, $file->getPathName(), $prefix)) {
$classes[] = $class;
}
}
return $classes;
}
private function convertFileToClass(string $path, string $file, string $prefix): ?string
{
$candidates = [
// namespaced class
$namespacedClass = str_replace([$path.\DIRECTORY_SEPARATOR, '.php', '/'], ['', '', '\\'], $file),
// namespaced class (with target dir)
$prefix.$namespacedClass,
// namespaced class (with target dir and separator)
$prefix.'\\'.$namespacedClass,
// PEAR class
str_replace('\\', '_', $namespacedClass),
// PEAR class (with target dir)
str_replace('\\', '_', $prefix.$namespacedClass),
// PEAR class (with target dir and separator)
str_replace('\\', '_', $prefix.'\\'.$namespacedClass),
];
if ($prefix) {
$candidates = array_filter($candidates, function ($candidate) use ($prefix) { return 0 === strpos($candidate, $prefix); });
}
// We cannot use the autoloader here as most of them use require; but if the class
// is not found, the new autoloader call will require the file again leading to a
// "cannot redeclare class" error.
foreach ($candidates as $candidate) {
if ($this->classExists($candidate)) {
return $candidate;
}
}
require_once $file;
foreach ($candidates as $candidate) {
if ($this->classExists($candidate)) {
return $candidate;
}
}
return null;
}
private function classExists(string $class): bool
{
return class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
}
}
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