1 files changed, 25 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/number_helper/number_to_delimited.rb b/activesupport/lib/active_support/number_helper/number_to_delimited.rb
new file mode 100644
index 0000000000..b543b0c19d
--- /dev/null
+++ b/activesupport/lib/active_support/number_helper/number_to_delimited.rb
@@ -0,0 +1,25 @@
+require 'active_support/number_helper/number_converter'
+
+module ActiveSupport
+  module NumberHelper
+    class NumberToDelimitedConverter < NumberConverter #:nodoc:
+
+      self.need_valid_float = true
+
+      DELIMITED_REGEX = /(\d)(?=(\d\d\d)+(?!\d))/
+
+      def convert
+        parts.join(options[:separator])
+      end
+
+      private
+
+        def parts
+          left, right = number.to_s.split('.')
+          left.gsub!(DELIMITED_REGEX) { "#{$1}#{options[:delimiter]}" }
+          [left, right].compact
+        end
+
+    end
+  end
+end