Improve handling of anonymous stack frames

Author: stayallive

src/Frame.php

@@ -13,7 +13,7 @@ final class Frame
 {
     public const INTERNAL_FRAME_FILENAME = '[internal]';
 
-    public const ANONYMOUS_CLASS_PREFIX = "class@anonymous\x00";
+    public const ANONYMOUS_CLASS_PREFIX = "@anonymous\x00";
 
     /**
      * @var string|null The name of the function being called

src/FrameBuilder.php

@@ -74,8 +74,11 @@ public function buildFromBacktraceFrame(string $file, int $line, array $backtrac
         if (isset($backtraceFrame['class']) && isset($backtraceFrame['function'])) {
             $functionName = $backtraceFrame['class'];
 
-            if (mb_substr($functionName, 0, mb_strlen(Frame::ANONYMOUS_CLASS_PREFIX)) === Frame::ANONYMOUS_CLASS_PREFIX) {
-                $functionName = Frame::ANONYMOUS_CLASS_PREFIX . $this->stripPrefixFromFilePath($this->options, substr($backtraceFrame['class'], \strlen(Frame::ANONYMOUS_CLASS_PREFIX)));
+            // Optimization: skip doing regex if we don't have prefixes to strip
+            if ($this->options->getPrefixes()) {
+                $functionName = preg_replace_callback('/' . Frame::ANONYMOUS_CLASS_PREFIX . '([^:]+)(:.*)?/', function (array $matches) {
+                    return Frame::ANONYMOUS_CLASS_PREFIX . $this->stripPrefixFromFilePath($this->options, $matches[1]) . ($matches[2] ?? '');
+                }, $functionName);
             }
 
             $rawFunctionName = \sprintf('%s::%s', $backtraceFrame['class'], $backtraceFrame['function']);

tests/FrameBuilderTest.php

@@ -149,6 +149,19 @@ public static function buildFromBacktraceFrameDataProvider(): \Generator
             ],
             new Frame(null, 'path/not/of/app/to/file', 10, null, 'path/not/of/app/to/file'),
         ];
+
+        yield [
+            new Options([
+                'prefixes' => ['/path/to'],
+            ]),
+            [
+                'file' => '/path/to/file',
+                'line' => 10,
+                'function' => 'test_function',
+                'class' => "App\\ClassName@anonymous\0/path/to/file:85$29e",
+            ],
+            new Frame("App\\ClassName@anonymous\0/file::test_function", '/file', 10, "App\\ClassName@anonymous\0/path/to/file:85$29e::test_function", '/path/to/file'),
+        ];
     }
 
     /**