Support for using local-name() on attributes.

lib/oga/xpath/evaluator.rb

@@ -708,7 +708,7 @@ module Oga
       def on_call_local_name(context, expression = nil)
         node = function_node(context, expression)
 
-        return node.is_a?(XML::Element) ? node.name : ''
+        return node.respond_to?(:name) ? node.name : ''
       end
 
       ##

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

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Oga::XPath::Evaluator do
   context 'local-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('local-name(root/b)').should == 'b'
       end
 
+      example 'return the local name for the "num" attribute' do
+        @evaluator.evaluate('local-name(root/b/@x:num)').should == 'num'
+      end
+
       example 'return only the name of the first node in the set' do
         @evaluator.evaluate('local-name(root/*)').should == 'a'
       end