From 49846f85864f4b59d5593c30ee3c59b584d2975d Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Wed, 14 May 2008 12:48:37 -0500
Subject: Create a seperate file for ActiveSupport::OrderedHash.

---
 activesupport/lib/active_support/ordered_hash.rb | 43 ++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 activesupport/lib/active_support/ordered_hash.rb

(limited to 'activesupport/lib/active_support/ordered_hash.rb')

diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
new file mode 100644
index 0000000000..6993621ef9
--- /dev/null
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -0,0 +1,43 @@
+# OrderedHash is namespaced to prevent conflicts with other implementations
+module ActiveSupport
+  # Hash is ordered in Ruby 1.9!
+  if RUBY_VERSION >= '1.9'
+    OrderedHash = ::Hash
+  else
+    class OrderedHash < Array #:nodoc:
+      def []=(key, value)
+        if pair = assoc(key)
+          pair.pop
+          pair << value
+        else
+          self << [key, value]
+        end
+      end
+
+      def [](key)
+        pair = assoc(key)
+        pair ? pair.last : nil
+      end
+
+      def delete(key)
+        pair = assoc(key)
+        pair ? array_index = index(pair) : nil
+        array_index ? delete_at(array_index).last : nil
+      end
+
+      def keys
+        collect { |key, value| key }
+      end
+
+      def values
+        collect { |key, value| value }
+      end
+
+      def to_hash
+        returning({}) do |hash|
+          each { |array| hash[array[0]] = array[1] }
+        end
+      end
+    end
+  end
+end
-- 
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