1 files changed, 42 insertions, 0 deletions
diff --git a/jni/ruby/lib/rake/scope.rb b/jni/ruby/lib/rake/scope.rb
new file mode 100644
index 0000000..dbefcea
--- /dev/null
+++ b/jni/ruby/lib/rake/scope.rb
@@ -0,0 +1,42 @@
+module Rake
+  class Scope < LinkedList # :nodoc: all
+
+    # Path for the scope.
+    def path
+      map { |item| item.to_s }.reverse.join(":")
+    end
+
+    # Path for the scope + the named path.
+    def path_with_task_name(task_name)
+      "#{path}:#{task_name}"
+    end
+
+    # Trim +n+ innermost scope levels from the scope. In no case will
+    # this trim beyond the toplevel scope.
+    def trim(n)
+      result = self
+      while n > 0 && ! result.empty?
+        result = result.tail
+        n -= 1
+      end
+      result
+    end
+
+    # Scope lists always end with an EmptyScope object. See Null
+    # Object Pattern)
+    class EmptyScope < EmptyLinkedList
+      @parent = Scope
+
+      def path
+        ""
+      end
+
+      def path_with_task_name(task_name)
+        task_name
+      end
+    end
+
+    # Singleton null object for an empty scope.
+    EMPTY = EmptyScope.new
+  end
+end