1 files changed, 80 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb b/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb
new file mode 100644
index 0000000000..20e482dcc2
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/cast.rb
@@ -0,0 +1,80 @@
+module ActiveRecord
+  module ConnectionAdapters
+    class PostgreSQLColumn < Column
+      module Cast
+        def string_to_time(string)
+          return string unless String === string
+
+          case string
+          when 'infinity'; 1.0 / 0.0
+          when '-infinity'; -1.0 / 0.0
+          else
+            super
+          end
+        end
+
+        def hstore_to_string(object)
+          if Hash === object
+            object.map { |k,v|
+              "#{escape_hstore(k)}=>#{escape_hstore(v)}"
+            }.join ','
+          else
+            object
+          end
+        end
+
+        def string_to_hstore(string)
+          if string.nil?
+            nil
+          elsif String === string
+            Hash[string.scan(HstorePair).map { |k,v|
+              v = v.upcase == 'NULL' ? nil : v.gsub(/^"(.*)"$/,'\1').gsub(/\\(.)/, '\1')
+              k = k.gsub(/^"(.*)"$/,'\1').gsub(/\\(.)/, '\1')
+              [k,v]
+            }]
+          else
+            string
+          end
+        end
+
+        def string_to_cidr(string)
+          if string.nil?
+            nil
+          elsif String === string
+            IPAddr.new(string)
+          else
+            string
+          end
+        end
+
+        def cidr_to_string(object)
+          if IPAddr === object
+            "#{object.to_s}/#{object.instance_variable_get(:@mask_addr).to_s(2).count('1')}"
+          else
+            object
+          end
+        end
+
+        private
+
+          HstorePair = begin
+            quoted_string = /"[^"\\]*(?:\\.[^"\\]*)*"/
+            unquoted_string = /(?:\\.|[^\s,])[^\s=,\\]*(?:\\.[^\s=,\\]*|=[^,>])*/
+            /(#{quoted_string}|#{unquoted_string})\s*=>\s*(#{quoted_string}|#{unquoted_string})/
+          end
+
+          def escape_hstore(value)
+            if value.nil?
+              'NULL'
+            else
+              if value == ""
+                '""'
+              else
+                '"%s"' % value.to_s.gsub(/(["\\])/, '\\\\\1')
+              end
+            end
+          end
+      end
+    end
+  end
+end