Added OrderedOptions array/hash for use with initializer

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2419 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

2 files changed, 46 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/ordered_options.rb b/activesupport/lib/active_support/ordered_options.rb
new file mode 100644
index 0000000000..3952ba41f2
--- /dev/null
+++ b/activesupport/lib/active_support/ordered_options.rb
@@ -0,0 +1,23 @@
+class OrderedOptions < Array
+  def []=(key, value)
+    key = key.to_sym
+    
+    if pair = find_pair(key)
+      pair.pop
+      pair << value
+    else
+      self << [key, value]
+    end
+  end
+  
+  def [](key)
+    pair = find_pair(key.to_sym)
+    pair ? pair.last : nil
+  end
+
+  private
+    def find_pair(key)
+      self.each { |i| return i if i.first == key }
+      return false
+    end
+end
\ No newline at end of file
diff --git a/activesupport/test/ordered_options_test.rb b/activesupport/test/ordered_options_test.rb
new file mode 100644
index 0000000000..c47e945c24
--- /dev/null
+++ b/activesupport/test/ordered_options_test.rb
@@ -0,0 +1,23 @@
+require 'test/unit'
+
+require File.dirname(__FILE__) + '/../lib/active_support/ordered_options'
+
+class OrderedOptionsTest < Test::Unit::TestCase
+  def test_usage
+    a = OrderedOptions.new
+
+    assert_nil a[:not_set]
+
+    a[:allow_concurreny] = true    
+    assert_equal 1, a.size
+    assert a[:allow_concurreny]
+
+    a[:allow_concurreny] = false
+    assert_equal 1, a.size
+    assert !a[:allow_concurreny]
+
+    a["else_where"] = 56
+    assert_equal 2, a.size
+    assert_equal 56, a[:else_where]
+  end
+end