Moved Active Support into its own gem

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@624 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 53 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/hash/keys.rb b/activesupport/lib/active_support/core_ext/hash/keys.rb
new file mode 100644
index 0000000000..8725138856
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/hash/keys.rb
@@ -0,0 +1,53 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      module Keys
+        # Return a new hash with all keys converted to strings.
+        def stringify_keys
+          inject({}) do |options, (key, value)|
+            options[key.to_s] = value
+            options
+          end
+        end
+
+        # Destructively convert all keys to strings.
+        def stringify_keys!
+          keys.each do |key|
+            unless key.class.to_s == "String" # weird hack to make the tests run when string_ext_test.rb is also running
+              self[key.to_s] = self[key]
+              delete(key)
+            end
+          end
+          self
+        end
+
+        # Return a new hash with all keys converted to symbols.
+        def symbolize_keys
+          inject({}) do |options, (key, value)|
+            options[key.to_sym] = value
+            options
+          end
+        end
+
+        # Destructively convert all keys to symbols.
+        def symbolize_keys!
+          keys.each do |key|
+            unless key.is_a?(Symbol)
+              self[key.to_sym] = self[key]
+              delete(key)
+            end
+          end
+          self
+        end
+
+        alias_method :to_options,  :symbolize_keys
+        alias_method :to_options!, :symbolize_keys!
+
+        def assert_valid_keys(valid_keys)
+          unknown_keys = keys - valid_keys
+          raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
+        end
+      end
+    end
+  end
+end