* lib/rexml/output.rb (REXML::Output): Don't output BOM in middle

of the output string.
* test/rexml/test_document.rb: Add a test for the above change.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Nov  3 14:41:17 2012  Kouhei Sutou  <kou@cozmixng.org>
+
+	* lib/rexml/output.rb (REXML::Output): Don't output BOM in middle
+	  of the output string.
+	* test/rexml/test_document.rb: Add a test for the above change.
+
 Sat Nov  3 14:09:55 2012  Kouhei Sutou  <kou@cozmixng.org>
 
 	* NEWS: Add an item about REXML::Document#write.

lib/rexml/output.rb

@@ -11,6 +11,11 @@ module REXML
       self.encoding = encd
 
       @to_utf = encd != 'UTF-8'
+
+      if encoding == "UTF-16"
+        @output << "\ufeff".encode("UTF-16BE")
+        self.encoding = "UTF-16BE"
+      end
     end
 
     def <<( content )

test/rexml/test_document.rb

@@ -296,5 +296,24 @@ EOX
         assert_equal("UTF-16", document.encoding)
       end
     end
+
+    class WriteTest < self
+      def test_utf_16
+        xml = <<-EOX.encode("UTF-16LE").force_encoding("ASCII-8BIT")
+<?xml version="1.0"?>
+<message>Hello world!</message>
+EOX
+        bom = "\ufeff".encode("UTF-16LE").force_encoding("ASCII-8BIT")
+        document = REXML::Document.new(bom + xml)
+
+        actual_xml = ""
+        document.write(actual_xml)
+        expected_xml = <<-EOX.encode("UTF-16BE")
+\ufeff<?xml version='1.0' encoding='UTF-16'?>
+<message>Hello world!</message>
+EOX
+        assert_equal(expected_xml, actual_xml)
+      end
+    end
   end
 end