use relative reference to parent class instead of closure

Author: leafo

moonscript/compile.lua

@@ -638,7 +638,7 @@ do
     __init = function(self, options)
       self.options = options
       self.root = self
-      return _parent_0.__init(self)
+      return self.__class.__parent.__init(self)
     end,
     __base = _base_0,
     __name = "RootBlock",
@@ -647,7 +647,10 @@ do
     __index = function(cls, name)
       local val = rawget(_base_0, name)
       if val == nil then
-        return _parent_0[name]
+        local parent = rawget(cls, "__parent")
+        if parent then
+          return parent[name]
+        end
       else
         return val
       end

moonscript/transform.moon

@@ -612,7 +612,25 @@ Statement = Transformer {
       class_lookup = build["if"] {
         cond: { "exp", {"ref", "val"}, "==", "nil" }
         then: {
-          parent_cls_name\index"name"
+          build.assign_one LocalName"parent", build.chain {
+            base: "rawget"
+            {
+              "call", {
+                {"ref", "cls"}
+                {"string", '"', "__parent"}
+              }
+            }
+          }
+
+          build.if {
+            cond: LocalName "parent"
+            then: {
+              build.chain {
+                base: LocalName "parent"
+                {"index", "name"}
+              }
+            }
+          }
         }
       }
       insert class_lookup, {"else", {"val"}}
@@ -660,14 +678,21 @@ Statement = Transformer {
           @put_name name if name
 
           @set "super", (block, chain) ->
+            relative_parent = {
+              "chain",
+              "self"
+              {"dot", "__class"}
+              {"dot", "__parent"}
+            }
+
             if chain
               chain_tail = { unpack chain, 3 }
-              new_chain = {"chain", parent_cls_name}
-
               head = chain_tail[1]
 
               if head == nil
-                return parent_cls_name
+                return relative_parent
+
+              new_chain = relative_parent
 
               switch head[1]
                 -- calling super, inject calling name and self into chain
@@ -702,7 +727,7 @@ Statement = Transformer {
 
               new_chain
             else
-              parent_cls_name
+              relative_parent
 
         {"declare_glob", "*"}
 

spec/class_spec.moon

@@ -19,8 +19,7 @@ describe "class", ->
     instance = Thing!
     assert.same instance\get_color!, "blue"
 
-
-  it "should have class property", ->
+  it "should have base properies from class", ->
     class Thing
       color: "blue"
       get_color: => @color
@@ -54,7 +53,6 @@ describe "class", ->
     assert.same instance.property, "name"
     assert.same instance.name, "the_thing"
 
-
   it "should call super method", ->
     class Base
       _count: 111
@@ -66,6 +64,18 @@ describe "class", ->
     instance = Thing!
     assert.same instance\counter!, "00000111"
 
+  it "should call other method from super", ->
+    class Base
+      _count: 111
+      counter: =>
+        @_count
+
+    class Thing extends Base
+      other_method: => super\counter!
+
+    instance = Thing!
+    assert.same instance\other_method!, 111
+
   it "should get super class", ->
     class Base
     class Thing extends Base
@@ -102,7 +112,6 @@ describe "class", ->
     Thing = class
     assert.same Thing.__name, "Thing"
 
-
   it "should not expose class properties on instance", ->
     class Thing
       @height: 10
@@ -135,3 +144,57 @@ describe "class", ->
     instance = Thing!
     instance\go!
 
+  it "should have class properies take precedence over base properties", ->
+    class Thing
+      @prop: "hello"
+      prop: "world"
+
+    assert.same "hello", Thing.prop
+
+  it "class properties take precedence in super class over base", ->
+    class Thing
+      @prop: "hello"
+      prop: "world"
+
+    class OtherThing extends Thing
+
+    assert.same "hello", OtherThing.prop
+
+  it "gets value from base in super class", ->
+    class Thing
+      prop: "world"
+
+    class OtherThing extends Thing
+    assert.same "world", OtherThing.prop
+
+  it "should let parent be replaced on class", ->
+    class A
+      @prop: "yeah"
+      cool: => 1234
+      plain: => "a"
+
+    class B
+      @prop: "okay"
+      cool: => 9999
+      plain: => "b"
+
+    class Thing extends A
+      cool: =>
+        super! + 1
+
+      get_super: =>
+        super
+
+    instance = Thing!
+
+    assert.same "a", instance\plain!
+    assert.same 1235, instance\cool!
+    assert A == instance\get_super!, "expected super to be B"
+
+    Thing.__parent = B
+    setmetatable Thing.__base, B.__base
+
+    assert.same "b", instance\plain!
+    assert.same 10000, instance\cool!
+    assert B == instance\get_super!, "expected super to be B"
+