1 files changed, 71 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/multibyte/unicode_database.rb b/activesupport/lib/active_support/multibyte/unicode_database.rb
new file mode 100644
index 0000000000..3b8cf8f9eb
--- /dev/null
+++ b/activesupport/lib/active_support/multibyte/unicode_database.rb
@@ -0,0 +1,71 @@
+# encoding: utf-8
+
+module ActiveSupport #:nodoc:
+  module Multibyte #:nodoc:
+    # Holds data about a codepoint in the Unicode database
+    class Codepoint
+      attr_accessor :code, :combining_class, :decomp_type, :decomp_mapping, :uppercase_mapping, :lowercase_mapping
+    end
+
+    # Holds static data from the Unicode database
+    class UnicodeDatabase
+      ATTRIBUTES = :codepoints, :composition_exclusion, :composition_map, :boundary, :cp1252
+
+      attr_writer(*ATTRIBUTES)
+
+      def initialize
+        @codepoints = Hash.new(Codepoint.new)
+        @composition_exclusion = []
+        @composition_map = {}
+        @boundary = {}
+        @cp1252 = {}
+      end
+
+      # Lazy load the Unicode database so it's only loaded when it's actually used
+      ATTRIBUTES.each do |attr_name|
+        class_eval(<<-EOS, __FILE__, __LINE__)
+          def #{attr_name}
+            load
+            @#{attr_name}
+          end
+        EOS
+      end
+
+      # Loads the Unicode database and returns all the internal objects of UnicodeDatabase.
+      def load
+        begin
+          @codepoints, @composition_exclusion, @composition_map, @boundary, @cp1252 = File.open(self.class.filename, 'rb') { |f| Marshal.load f.read }
+        rescue Exception => e
+            raise IOError.new("Couldn't load the Unicode tables for UTF8Handler (#{e.message}), ActiveSupport::Multibyte is unusable")
+        end
+
+        # Redefine the === method so we can write shorter rules for grapheme cluster breaks
+        @boundary.each do |k,_|
+          @boundary[k].instance_eval do
+            def ===(other)
+              detect { |i| i === other } ? true : false
+            end
+          end if @boundary[k].kind_of?(Array)
+        end
+
+        # define attr_reader methods for the instance variables
+        class << self
+          attr_reader(*ATTRIBUTES)
+        end
+      end
+
+      # Returns the directory in which the data files are stored
+      def self.dirname
+        File.dirname(__FILE__) + '/../values/'
+      end
+
+      # Returns the filename for the data file for this version
+      def self.filename
+        File.expand_path File.join(dirname, "unicode_tables.dat")
+      end
+    end
+
+    # UniCode Database
+    UCD = UnicodeDatabase.new
+  end
+end
+\ No newline at end of file