[ruby-core:112277] [Ruby master Feature#17753] Add Module#namespace

Issue #17753 has been updated by fxn (Xavier Noria).


Yeah, I believe the feature makes sense and can be useful, and the proposed implementation that keeps a pointer is well-defined (vs what AS does). Also consistent with `Module#name`, as you said.

My observations above were more related to the name `namespace` I think, because we are defining "the class or module object that holded the constant to which I was initially assigned, if any". That is weaker.


Regarding your proposal, in English would be `parent_module` right?

Let me add something, this is practical, but the Ruby model suffers just a little bit in my view. Let me explain.

To me:

```ruby
module M
  X = String.new
end

module N
  X = Module.new
end
```

are essentially the same, Ruby objects stored in places. As we all know, the Ruby model is quite unconstrained, which makes it beautiful, but also weaker in a logical sense.

So, there is a part of me that believes for consistency the string object should also respond to `parent_module`, which is a weird derivation. (I am playing reductio at absurdum here, no proposing that!). 

However, maybe in this case practicality can win over a pure and spherical language model, I don't know :).

----------------------------------------
Feature #17753: Add Module#namespace
https://bugs.ruby-lang.org/issues/17753#change-101709

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
Given code like this:

```ruby
module A
  module B
    class C; end
    class D; end
  end
end
```

We can get from `C` to `B` like `C.outer_scope`, or to `A` like
`C.outer_scope.outer_scope`.

I want to use this in cases where I don't know the outer scope, but I
want to find constants that are "siblings" of a constant.  For example,
I can do `A::B::C.outer_scope.constants` to find the list of "sibling"
constants to `C`.  I want to use this feature when walking objects and
introspecting.  For example:

```ruby
ObjectSpace.each_object(Class) do |k|
  p siblings: k.outer_scope.constants
end
```

I've attached a patch that implements this feature, and there is a pull request on GitHub [here](https://github.com/ruby/ruby/pull/4326).

---Files--------------------------------
0001-Add-Module-outer_scope.patch (5.93 KB)
0001-Add-Module-namespace.patch (5.89 KB)


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