Support for using name() with attributes.

lib/oga/xpath/evaluator.rb

@@ -725,7 +725,7 @@ module Oga
       def on_call_name(context, expression = nil)
         node = function_node(context, expression)
 
-        if node.is_a?(XML::Element)
+        if node.respond_to?(:name) and node.respond_to?(:namespace)
           if node.namespace
             return "#{node.namespace.name}:#{node.name}"
           else

spec/oga/xpath/evaluator/calls/name_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Oga::XPath::Evaluator do
   context 'name() function' do
     before do
-      @document  = parse('<root xmlns:x="y"><x:a></x:a><b></b></root>')
+      @document  = parse('<root xmlns:x="y"><x:a></x:a><b x:num="10"></b></root>')
       @evaluator = described_class.new(@document)
     end
 
@@ -16,6 +16,10 @@ describe Oga::XPath::Evaluator do
         @evaluator.evaluate('name(root/b)').should == 'b'
       end
 
+      example 'return the local name for the "num" attribute' do
+        @evaluator.evaluate('name(root/b/@x:num)').should == 'x:num'
+      end
+
       example 'return only the name of the first node in the set' do
         @evaluator.evaluate('name(root/*)').should == 'x:a'
       end