[Debug] added the component (closes #6828, closes #6834, closes #7330)

UPGRADE-3.0.md

@@ -3,8 +3,8 @@ UPGRADE FROM 2.x to 3.0
 
 ### ClassLoader
 
- * The `UniversalClassLoader` class has been removed in favor of `ClassLoader`. The only difference is that some method
-    names are different:
+ * The `UniversalClassLoader` class has been removed in favor of
+   `ClassLoader`. The only difference is that some method names are different:
 
       * `registerNamespaces()` -> `addPrefixes()`
       * `registerPrefixes()` -> `addPrefixes()`
@@ -34,6 +34,16 @@ UPGRADE FROM 2.x to 3.0
      * `Symfony\Bridge\Monolog\Logger`
      * `Symfony\Component\HttpKernel\Log\NullLogger`
 
+ * The `Symfony\Component\HttpKernel\Kernel::init()` method has been removed.
+
+ * The following classes have been renamed as they have been moved to the
+   Debug component:
+
+    * `Symfony\Component\HttpKernel\Debug\ErrorHandler` -> `Symfony\Component\Debug\ErrorHandler`
+    * `Symfony\Component\HttpKernel\Debug\ExceptionHandler` -> `Symfony\Component\Debug\ExceptionHandler`
+    * `Symfony\Component\HttpKernel\Exception\FatalErrorException` -> `Symfony\Component\Debug\Exception\FatalErrorException`
+    * `Symfony\Component\HttpKernel\Exception\FlattenException` -> `Symfony\Component\Debug\Exception\FlattenException`
+
 ### Routing
 
  * Some route settings have been renamed:

src/Symfony/Component/Debug/.gitignore

@@ -0,0 +1,5 @@
+vendor/
+composer.lock
+phpunit.xml
+Tests/ProjectContainer.php
+Tests/classes.map

src/Symfony/Component/Debug/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+2.3.0
+-----
+
+ * added the component

src/Symfony/Component/Debug/ErrorHandler.php

@@ -0,0 +1,128 @@
+<?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;
+
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Psr\Log\LoggerInterface;
+
+/**
+ * ErrorHandler.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ErrorHandler
+{
+    const TYPE_DEPRECATION = -100;
+
+    private $levels = array(
+        E_WARNING           => 'Warning',
+        E_NOTICE            => 'Notice',
+        E_USER_ERROR        => 'User Error',
+        E_USER_WARNING      => 'User Warning',
+        E_USER_NOTICE       => 'User Notice',
+        E_STRICT            => 'Runtime Notice',
+        E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
+        E_DEPRECATED        => 'Deprecated',
+        E_USER_DEPRECATED   => 'User Deprecated',
+        E_ERROR             => 'Error',
+        E_CORE_ERROR        => 'Core Error',
+        E_COMPILE_ERROR     => 'Compile Error',
+        E_PARSE             => 'Parse',
+    );
+
+    private $level;
+
+    private $reservedMemory;
+
+    /** @var LoggerInterface */
+    private static $logger;
+
+    /**
+     * Register the error handler.
+     *
+     * @param integer $level The level at which the conversion to Exception is done (null to use the error_reporting() value and 0 to disable)
+     *
+     * @return The registered error handler
+     */
+    public static function register($level = null)
+    {
+        $handler = new static();
+        $handler->setLevel($level);
+
+        ini_set('display_errors', 0);
+        set_error_handler(array($handler, 'handle'));
+        register_shutdown_function(array($handler, 'handleFatal'));
+        $handler->reservedMemory = str_repeat('x', 10240);
+
+        return $handler;
+    }
+
+    public function setLevel($level)
+    {
+        $this->level = null === $level ? error_reporting() : $level;
+    }
+
+    public static function setLogger(LoggerInterface $logger)
+    {
+        self::$logger = $logger;
+    }
+
+    /**
+     * @throws \ErrorException When error_reporting returns error
+     */
+    public function handle($level, $message, $file, $line, $context)
+    {
+        if (0 === $this->level) {
+            return false;
+        }
+
+        if ($level & (E_USER_DEPRECATED | E_DEPRECATED)) {
+            if (null !== self::$logger) {
+                $stack = version_compare(PHP_VERSION, '5.4', '<') ? array_slice(debug_backtrace(false), 0, 10) : debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 10);
+
+                self::$logger->warning($message, array('type' => self::TYPE_DEPRECATION, 'stack' => $stack));
+            }
+
+            return true;
+        }
+
+        if (error_reporting() & $level && $this->level & $level) {
+            throw new \ErrorException(sprintf('%s: %s in %s line %d', isset($this->levels[$level]) ? $this->levels[$level] : $level, $message, $file, $line), 0, $level, $file, $line);
+        }
+
+        return false;
+    }
+
+    public function handleFatal()
+    {
+        if (null === $error = error_get_last()) {
+            return;
+        }
+
+        unset($this->reservedMemory);
+        $type = $error['type'];
+        if (0 === $this->level || !in_array($type, array(E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE))) {
+            return;
+        }
+
+        // get current exception handler
+        $exceptionHandler = set_exception_handler(function() {});
+        restore_exception_handler();
+
+        if (is_array($exceptionHandler) && $exceptionHandler[0] instanceof ExceptionHandler) {
+            $level = isset($this->levels[$type]) ? $this->levels[$type] : $type;
+            $message = sprintf('%s: %s in %s line %d', $level, $error['message'], $error['file'], $error['line']);
+            $exception = new FatalErrorException($message, 0, $type, $error['file'], $error['line']);
+            $exceptionHandler[0]->handle($exception);
+        }
+    }
+}

src/Symfony/Component/Debug/Exception/FatalErrorException.php

@@ -0,0 +1,21 @@
+<?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\Exception;
+
+/**
+ * Fatal Error Exception.
+ *
+ * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ */
+class FatalErrorException extends \ErrorException
+{
+}