diff --git a/CHANGELOG.md b/CHANGELOG.md index b78411a..c6a8d0a 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,4 +1,82 @@ +# MoonScript v0.4.0 (2015-12-06) + +## Changes to `super` + +`super` now looks up the parent method via the class reference, instead of a +(fixed) closure to the parent class. + +Given the following code: + +```moonscript +class MyThing extends OtherThing + the_method: => + super! +``` + +In the past `super` would compile to something like this: + +```lua +_parent_0.the_method(self) +``` + +Where `_parent_0` was an internal local variable that contains a reference to +the parent class. Because the reference to parent is an internal local +variable, you could never swap out the parent unless resorting to the debug +library. + +This version will compile to: + +```lua +_class_0.__parent.__base.the_method(self) +``` + +Where `_class_0` is an internal local variable that contains the current class (`MyThing`). + +Another difference is that the instance method is looked up on `__base` instead +of the class. The old variation would trigger the metamethod for looking up on +the instance, but a class method of the same name could conflict, take +precedence, and be retuned instead. By referencing `__base` directly we avoid +this issue. + +### Super on class methods + +`super` can now be used on class methods. It works exactly as you would expect. + +```moonscript +class MyThing extends OtherThing + @static_method: => + print super! +``` + +Calling `super` will compile to: + +```moonscript +_class_0.__parent.static_method(self) +``` + +### Improved scoping for super + +The scoping of super is more intelligent. You can warp your methods in other +code and `super` will still generate correctly. For example, syntax like this +will now work as expected: + +```moonscript +class Sub extends Base + value: if debugging + => super! + 100 + else + => super! + 10 + + other_value: some_decorator { + the_func: => + super! + } +``` + +`super` will refer to the lexically closest class declaration to find the name +of the method it should call on the parent. + # MoonScript v0.3.2 (2015-6-01) ## Bug Fixes