1 files changed, 187 insertions, 0 deletions
diff --git a/trunk/ext/tk/lib/tk/encodedstr.rb b/trunk/ext/tk/lib/tk/encodedstr.rb
new file mode 100644
index 0000000000..02de0b0d85
--- /dev/null
+++ b/trunk/ext/tk/lib/tk/encodedstr.rb
@@ -0,0 +1,187 @@
+#
+# tk/encodedstr.rb : Tk::EncodedString class
+#
+require 'tk'
+
+###########################################
+#  string with Tcl's encoding
+###########################################
+module Tk
+  class EncodedString < String
+    Encoding = nil
+
+    def self.subst_utf_backslash(str)
+      # str.gsub(/\\u([0-9A-Fa-f]{1,4})/){[$1.hex].pack('U')}
+      TclTkLib._subst_UTF_backslash(str)
+    end
+    def self.utf_backslash(str)
+      self.subst_utf_backslash(str)
+    end
+
+    def self.subst_tk_backslash(str)
+      TclTkLib._subst_Tcl_backslash(str)
+    end
+
+    def self.utf_to_backslash_sequence(str)
+      str.unpack('U*').collect{|c|
+        if c <= 0xFF  # ascii character
+          c.chr
+        else
+          format('\u%X', c)
+        end
+      }.join('')
+    end
+    def self.utf_to_backslash(str)
+      self.utf_to_backslash_sequence(str)
+    end
+
+    def self.to_backslash_sequence(str)
+      str.unpack('U*').collect{|c|
+        if c <= 0x1F  # control character
+          case c
+          when 0x07; '\a'
+          when 0x08; '\b'
+          when 0x09; '\t'
+          when 0x0a; '\n'
+          when 0x0b; '\v'
+          when 0x0c; '\f'
+          when 0x0d; '\r'
+          else
+            format('\x%02X', c)
+          end
+        elsif c <= 0xFF  # ascii character
+          c.chr
+        else
+          format('\u%X', c)
+        end
+      }.join('')
+    end
+
+    def self.new_with_utf_backslash(str, enc = nil)
+      self.new('', enc).replace(self.subst_utf_backslash(str))
+    end
+
+    def self.new_without_utf_backslash(str, enc = nil)
+      self.new('', enc).replace(str)
+    end
+
+    def initialize(str, enc = nil)
+      super(str)
+      # @encoding = ( enc || 
+      #              ((self.class::Encoding)? 
+      #                  self.class::Encoding : Tk.encoding_system) )
+      enc ||= (self.class::Encoding)?
+                         self.class::Encoding : 
+                         ((Tk.encoding)? Tk.encoding : Tk.encoding_system)
+      if TkCore::WITH_ENCODING
+        unless encobj = Tk::Encoding::ENCODING_TABLE.get_obj(enc)
+          fail ArgumentError, "unsupported Tk encoding '#{enc}'"
+        end
+        self.force_encoding(encobj)
+      else
+        @encoding = enc
+      end
+    end
+
+    if TkCore::WITH_ENCODING
+      alias encoding_obj encoding
+      alias __encoding   encoding
+      def encoding
+        Tk::Encoding::ENCODING_TABLE.get_name(super())
+      end
+    else
+      def encoding
+        @encoding
+      end
+      alias encoding_obj encoding
+    end
+
+    if TkCore::WITH_ENCODING
+      # wrapper methods for compatibility
+      alias __instance_variable_get instance_variable_get
+      alias __instance_variable_set instance_variable_set
+      alias __instance_eval         instance_eval
+      alias __instance_variables    instance_variables
+
+      def instance_variable_get(key)
+        if (key.to_s == '@encoding')
+          self.encoding
+        else
+          super(key)
+        end
+      end
+
+      def instance_variable_set(key, value)
+        if (key.to_s == '@encoding')
+          if value
+            self.force_encoding(value)
+          else
+            self.force_encoding(Tk::Encoding::UNKNOWN)
+          end
+          value
+        else
+          super(key, value)
+        end
+      end
+
+      def instance_eval(*args, &b)
+        old_enc = @encoding = self.encoding
+
+        ret = super(*args, &b)
+
+        if @encoding
+          if @encoding != old_enc
+            # modified by user
+            self.force_encoding(@encoding)
+          end
+          remove_instance_variable(:@encoding)
+        else
+          begin
+            remove_instance_variable(:@encoding)
+            # user sets to nil -> use current default
+            self.force_encoding(Tk.encoding)
+          rescue NameError
+            # removed by user -> ignore, because user don't use @encoding
+          end
+        end
+        ret
+      end
+    end
+
+    def instance_variables
+      ret = super()
+      ret << :@encoding  # fake !!
+      ret
+    end
+  end
+  # def Tk.EncodedString(str, enc = nil)
+  #   Tk::EncodedString.new(str, enc)
+  # end
+
+  ##################################
+
+  class BinaryString < EncodedString
+    Encoding = 'binary'.freeze
+  end
+  # def Tk.BinaryString(str)
+  #   Tk::BinaryString.new(str)
+  # end
+
+  ##################################
+
+  class UTF8_String < EncodedString
+    Encoding = 'utf-8'.freeze
+    def self.new(str)
+      super(self.subst_utf_backslash(str))
+    end
+
+    def to_backslash_sequence
+      Tk::EncodedString.utf_to_backslash_sequence(self)
+    end
+    alias to_backslash to_backslash_sequence
+  end
+  # def Tk.UTF8_String(str)
+  #   Tk::UTF8_String.new(str)
+  # end
+
+end