Add autoload support for .hh files (HHVM)

HHVM is adding support for an alternative extension for files using
HHVM-specific features. Support them in the Class Map and PSR4
autoloaders.

Trivial example: https://github.com/fredemmott/hh_extension_toolset

src/Composer/Autoload/ClassLoader.php

@@ -291,8 +291,22 @@ class ClassLoader
             return $this->classMap[$class];
         }
 
+        $file = $this->findFileWithExtension($class, '.php');
+        if ($file === null) {
+          // Indicates a Hack file (hacklang.org)
+          $file = $this->findFileWithExtension($class, '.hh');
+        }
+
+        if ($file === null) {
+            // Remember that this class does not exist.
+            return $this->classMap[$class] = false;
+        }
+        return $file;
+    }
+
+    private function findFileWithExtension($class, $ext) {
         // PSR-4 lookup
-        $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . '.php';
+        $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
 
         $first = $class[0];
         if (isset($this->prefixLengthsPsr4[$first])) {
@@ -321,7 +335,7 @@ class ClassLoader
                 . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
         } else {
             // PEAR-like class name
-            $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . '.php';
+            $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
         }
 
         if (isset($this->prefixesPsr0[$first])) {
@@ -348,8 +362,7 @@ class ClassLoader
             return $file;
         }
 
-        // Remember that this class does not exist.
-        return $this->classMap[$class] = false;
+        return null;
     }
 }
 

src/Composer/Autoload/ClassMapGenerator.php

@@ -54,7 +54,7 @@ class ClassMapGenerator
             if (is_file($path)) {
                 $path = array(new \SplFileInfo($path));
             } elseif (is_dir($path)) {
-                $path = Finder::create()->files()->followLinks()->name('/\.(php|inc)$/')->in($path);
+                $path = Finder::create()->files()->followLinks()->name('/\.(php|inc|hh)$/')->in($path);
             } else {
                 throw new \RuntimeException(
                     'Could not scan for classes inside "'.$path.
@@ -68,7 +68,7 @@ class ClassMapGenerator
         foreach ($path as $file) {
             $filePath = $file->getRealPath();
 
-            if (!in_array(pathinfo($filePath, PATHINFO_EXTENSION), array('php', 'inc'))) {
+            if (!in_array(pathinfo($filePath, PATHINFO_EXTENSION), array('php', 'inc', 'hh'))) {
                 continue;
             }