* lib/rexml/encoding.rb: use Ruby native encoding mechnism. [ruby-dev:42464]

* lib/rexml/encodings/: remove.

* lib/rexml/document.rb, lib/rexml/formatters/default.rb,
  lib/rexml/output.rb, lib/rexml/parseexception.rb,
  lib/rexml/parsers/baseparser.rb, lib/rexml/source.rb,
  lib/rexml/xmldecl.rb: use Ruby's native Encoding object.

* test/rexml/, test/rss/: follow the above encoding chagnes.

* NEWS: add REXML's incompatible change about encoding.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29646 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 56 insertions, 60 deletions

diff --git a/lib/rexml/encoding.rb b/lib/rexml/encoding.rb
index 3feffb80f4..0c4a88fbeb 100644
--- a/lib/rexml/encoding.rb
+++ b/lib/rexml/encoding.rb
@@ -1,71 +1,67 @@
 # -*- mode: ruby; ruby-indent-level: 2; indent-tabs-mode: t; tab-width: 2 -*- vim: sw=2 ts=2
 module REXML
   module Encoding
-    @encoding_methods = {}
-    def self.register(enc, &block)
-      @encoding_methods[enc] = block
-    end
-    def self.apply(obj, enc)
-      @encoding_methods[enc][obj]
-    end
-    def self.encoding_method(enc)
-      @encoding_methods[enc]
-    end
-
-    # Native, default format is UTF-8, so it is declared here rather than in
-    # an encodings/ definition.
-    UTF_8 = 'UTF-8'
-    UTF_16 = 'UTF-16'
-    UNILE = 'UNILE'
-
-    # ID ---> Encoding name
-    attr_reader :encoding
-    def encoding=( enc )
-      old_verbosity = $VERBOSE
-      begin
-        $VERBOSE = false
-        enc = enc.nil? ? nil : enc.upcase
-        return false if defined? @encoding and enc == @encoding
-        if enc and enc != UTF_8
-          @encoding = enc
-          raise ArgumentError, "Bad encoding name #@encoding" unless @encoding =~ /^[\w-]+$/
-          @encoding.untaint
-          begin
-            require 'rexml/encodings/ICONV.rb'
-            Encoding.apply(self, "ICONV")
-          rescue LoadError, Exception
-            begin
-              enc_file = File.join( "rexml", "encodings", "#@encoding.rb" )
-              require enc_file
-              Encoding.apply(self, @encoding)
-            rescue LoadError => err
-              puts err.message
-              raise ArgumentError, "No decoder found for encoding #@encoding.  Please install iconv."
-            end
-          end
-        else
-          @encoding = UTF_8
-          require 'rexml/encodings/UTF-8.rb'
-          Encoding.apply(self, @encoding)
-        end
-      ensure
-        $VERBOSE = old_verbosity
+    # ID ---> Encoding object
+		attr_reader :encoding
+    def encoding=(encoding)
+			if encoding.is_a?(String)
+				original_encoding = encoding
+				encoding = find_encoding(encoding)
+				unless encoding
+					raise ArgumentError, "Bad encoding name #{original_encoding}"
+				end
+			end
+			return false if defined?(@encoding) and encoding == @encoding
+			if encoding and encoding != ::Encoding::UTF_8
+				@encoding = encoding
+			else
+				@encoding = ::Encoding::UTF_8
       end
       true
     end
 
-    def check_encoding str
+    def check_encoding(xml)
       # We have to recognize UTF-16, LSB UTF-16, and UTF-8
-      if str[0,2] == "\xfe\xff"
-        str[0,2] = ""
-        return UTF_16
-      elsif str[0,2] == "\xff\xfe"
-        str[0,2] = ""
-        return UNILE
-      end
-      str =~ /^\s*<\?xml\s+version\s*=\s*(['"]).*?\1\s+encoding\s*=\s*(["'])(.*?)\2/m
-      return $3.upcase if $3
-      return UTF_8
+      if xml[0, 2] == "\xfe\xff"
+        xml[0, 2] = ""
+				::Encoding::UTF_16BE
+      elsif xml[0, 2] == "\xff\xfe"
+        xml[0, 2] = ""
+				::Encoding::UTF_16LE
+			else
+				if /\A\s*<\?xml\s+version\s*=\s*(['"]).*?\1
+            \s+encoding\s*=\s*(["'])(.*?)\2/mx =~ xml
+					encoding_name = $3
+					if /\Autf-16\z/i =~ encoding_name
+						::Encoding::UTF_16BE
+					else
+						find_encoding(encoding_name)
+					end
+				else
+					::Encoding::UTF_8
+				end
+			end
     end
+
+		def encode(string)
+			string.encode(@encoding)
+		end
+
+		def decode(string)
+			string.encode(::Encoding::UTF_8, @encoding)
+		end
+
+		private
+		def find_encoding(name)
+			case name
+			when "UTF-16"
+				name = "UTF-16BE"
+			when /\Ashift-jis\z/i
+				name = "Shift_JIS"
+			when /\ACP-(\d+)\z/
+				name = "CP#{$1}"
+			end
+			::Encoding.find(name)
+		end
   end
 end