* lib/rake: Import Rake 0.9.2

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/rake/cloneable.rb b/lib/rake/cloneable.rb
new file mode 100644
index 0000000000..19c780bff6
--- /dev/null
+++ b/lib/rake/cloneable.rb
@@ -0,0 +1,25 @@
+module Rake
+  # ##########################################################################
+  # Mixin for creating easily cloned objects.
+  #
+  module Cloneable
+    # Clone an object by making a new object and setting all the instance
+    # variables to the same values.
+    def dup
+      sibling = self.class.new
+      instance_variables.each do |ivar|
+        value = self.instance_variable_get(ivar)
+        new_value = value.clone rescue value
+        sibling.instance_variable_set(ivar, new_value)
+      end
+      sibling.taint if tainted?
+      sibling
+    end
+
+    def clone
+      sibling = dup
+      sibling.freeze if frozen?
+      sibling
+    end
+  end
+end