Improve support for anonymous classes

Author: nicolas-grekas

Application.php

@@ -753,12 +753,20 @@ protected function doRenderException(\Exception $e, OutputInterface $output)
         do {
             $message = trim($e->getMessage());
             if ('' === $message || OutputInterface::VERBOSITY_VERBOSE <= $output->getVerbosity()) {
-                $title = sprintf('  [%s%s]  ', \get_class($e), 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : '');
+                $class = \get_class($e);
+                $class = 'c' === $class[0] && 0 === strpos($class, "class@anonymous\0") ? get_parent_class($class).'@anonymous' : $class;
+                $title = sprintf('  [%s%s]  ', $class, 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : '');
                 $len = Helper::strlen($title);
             } else {
                 $len = 0;
             }
 
+            if (false !== strpos($message, "class@anonymous\0")) {
+                $message = preg_replace_callback('/class@anonymous\x00.*?\.php0x?[0-9a-fA-F]++/', function ($m) {
+                    return \class_exists($m[0], false) ? get_parent_class($m[0]).'@anonymous' : $m[0];
+                }, $message);
+            }
+
             $width = $this->terminal->getWidth() ? $this->terminal->getWidth() - 1 : PHP_INT_MAX;
             $lines = array();
             foreach ('' !== $message ? preg_split('/\r?\n/', $message) : array() as $line) {

Tests/ApplicationTest.php

@@ -824,6 +824,31 @@ public function testRenderExceptionLineBreaks()
         $this->assertStringMatchesFormatFile(self::$fixturesPath.'/application_renderexception_linebreaks.txt', $tester->getDisplay(true), '->renderException() keep multiple line breaks');
     }
 
+    public function testRenderAnonymousException()
+    {
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application->register('foo')->setCode(function () {
+            throw new class('') extends \InvalidArgumentException {
+            };
+        });
+        $tester = new ApplicationTester($application);
+
+        $tester->run(array('command' => 'foo'), array('decorated' => false));
+        $this->assertContains('[InvalidArgumentException@anonymous]', $tester->getDisplay(true));
+
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application->register('foo')->setCode(function () {
+            throw new \InvalidArgumentException(sprintf('Dummy type "%s" is invalid.', \get_class(new class() {
+            })));
+        });
+        $tester = new ApplicationTester($application);
+
+        $tester->run(array('command' => 'foo'), array('decorated' => false));
+        $this->assertContains('Dummy type "@anonymous" is invalid.', $tester->getDisplay(true));
+    }
+
     public function testRun()
     {
         $application = new Application();