Parsing support for the :last-of-type pseudo.

lib/oga/css/parser.y

@@ -515,12 +515,23 @@ end
   end
 
   ##
+  # Generates the AST for the `:first-of-type` selector.
+  #
   # @return [AST::Node]
   #
   def on_pseudo_class_first_of_type
     return s(:eq, s(:call, 'position'), s(:int, 1))
   end
 
+  ##
+  # Generates the AST for the `:last-of-type` selector.
+  #
+  # @return [AST::Node]
+  #
+  def on_pseudo_class_last_of_type
+    return s(:eq, s(:call, 'position'), s(:call, 'last'))
+  end
+
   private
 
   ##

spec/oga/css/parser/pseudo_classes/last_of_type_spec.rb

@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe Oga::CSS::Parser do
+  context ':last-of-type pseudo class' do
+    example 'parse the :last-of-type pseudo class' do
+      parse_css(':last-of-type').should == parse_xpath(
+        'descendant-or-self::*[position() = last()]'
+      )
+    end
+  end
+end