Add Scope#root, returning the top scope.

enspirit · Jun 13, 2012 · 7d10b33 · 7d10b33
1 parent 4dcfda7
commit 7d10b33
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diff --git a/lib/wlang/scope.rb b/lib/wlang/scope.rb
@@ -30,6 +30,10 @@ def self.chain(scopes)
       }
     end
 
+    def root
+      parent.nil? ? self : parent.root
+    end
+
     def push(x)
       Scope.coerce(x, self)
     end

diff --git a/spec/unit/test_scope.rb b/spec/unit/test_scope.rb
@@ -28,6 +28,13 @@ module WLang
       end
     end
 
+    it 'gives access to the root' do
+      scope.root.should eq(Scope.null)
+      scope.with(:other => "World2") do |s|
+        s.root.should eq(Scope.null)
+      end
+    end
+
     it 'evaluates `self` accurately' do
       scope.evaluate(:self).should eq(:who => "World")
     end