fix #1005. fix a regression introduced in eebfda0

Parsing empty documents should raise a SyntaxError when strict parsing
is turned on

CHANGELOG.ja.rdoc

@@ -24,6 +24,7 @@
   * (JRuby) XSD validation crashes in Java version. #373
   * (JRuby) Document already has a root node error while using Builder. #646
   * (JRuby) c14n tests are all passing on JRuby. #226
+  * Parsing empty documents raise SyntaxError in strict mode. #1005
 
 === 1.6.0 / 2013年6月8日
 

CHANGELOG.rdoc

@@ -36,6 +36,7 @@
   * (JRuby) XSD validation crashes in Java version. #373
   * (JRuby) Document already has a root node error while using Builder. #646
   * (JRuby) c14n tests are all passing on JRuby. #226
+  * Parsing empty documents raise SyntaxError in strict mode. #1005
 
 
 === 1.6.0 / 2013-06-08

lib/nokogiri/xml/document.rb

@@ -45,7 +45,7 @@ def self.parse string_or_io, url = nil, encoding = nil, options = ParseOptions::
         # Give the options to the user
         yield options if block_given?
 
-        return new if empty_doc?(string_or_io)
+        return new if !options.strict? && empty_doc?(string_or_io)
 
         doc = if string_or_io.respond_to?(:read)
           url ||= string_or_io.respond_to?(:path) ? string_or_io.path : nil

test/xml/test_document.rb

@@ -26,6 +26,13 @@ def test_dtd_with_empty_internal_subset
         assert doc.root
       end
 
+      # issue #1005
+      def test_strict_parsing_empty_doc_should_raise_exception
+        assert_raises(SyntaxError) do
+          Nokogiri::XML(StringIO.new('')) { |c| c.strict }
+        end
+      end
+
       # issue #838
       def test_document_with_invalid_prolog
         doc = Nokogiri::XML '<? ?>'