Add initial support for Module#autoload()

adambeynon · adambeynon · commit 6be00fe6243f · 2014-06-17T16:05:31.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -15,6 +15,8 @@
 
 *   Remove `const_missing` option from compiler. All constant lookups are now strict.
 
+*   Add initial support for Module#autoload.
+
 ## 0.6.2 2014-04-25
 
 *   Added Range#size
diff --git a/lib/opal/nodes/call.rb b/lib/opal/nodes/call.rb
@@ -126,6 +126,7 @@ def compile_default?
 
       add_special :autoload do
         if scope.class_scope?
+          compile_default!
           str = DependencyResolver.new(compiler, arglist[2]).resolve
           compiler.requires << str unless str.nil?
           push fragment('')
diff --git a/opal/corelib/module.rb b/opal/corelib/module.rb
@@ -180,6 +180,19 @@ def attr_writer(*names)
 
   alias attr attr_accessor
 
+  def autoload(const, path)
+    %x{
+      var autoloaders;
+
+      if (!(autoloaders = self.__autoload)) {
+        autoloaders = self.__autoload = {};
+      }
+
+      autoloaders[#{const}] = #{path};
+      return nil;
+    }
+  end
+
   def constants
     `self._scope.constants`
   end
@@ -233,6 +246,15 @@ def const_get(name, inherit = true)
   end
 
   def const_missing(const)
+    %x{
+      var autoloader;
+
+      if (self.__autoload && (autoloader = self.__autoload[#{const}])) {
+        console.log("autoloading: " + #{const});
+        return self.$require(autoloader);
+      }
+    }
+
     name = `self._name`
 
     raise NameError, "uninitialized constant #{name}::#{const}"
