Added custom selectors

lib/capybara.rb

@@ -45,6 +45,14 @@ module Capybara
     def configure
       yield self
     end
+
+    def add_selector(name, &block)
+      selectors[name.to_sym] = block
+    end
+
+    def selectors
+      @selectors ||= {}
+    end
   end
 
   autoload :Server,     'capybara/server'
@@ -70,3 +78,6 @@ Capybara.configure do |config|
   config.default_wait_time = 2
   config.ignore_hidden_elements = false
 end
+
+Capybara.add_selector(:xpath) { |xpath| xpath }
+Capybara.add_selector(:css)   { |css| XPath::HTML.from_css(css) }

lib/capybara/node/finders.rb

@@ -142,8 +142,7 @@ module Capybara
 
       def normalize_locator(kind, locator=nil)
         kind, locator = Capybara.default_selector, kind if locator.nil?
-        locator = XPath::HTML.from_css(locator) if kind == :css
-        locator
+        Capybara.selectors[kind.to_sym].call(locator)
       end
 
       def wait_conditionally_until

lib/capybara/spec/session/find_spec.rb

@@ -49,6 +49,14 @@ shared_examples_for "find" do
       end
     end
 
+    context "with custom selector" do
+      it "should use the custom selector" do
+        Capybara.add_selector(:monkey) { |name| ".//*[@id='#{name}_monkey']" }
+        @session.find(:monkey, 'john').text.should == 'Monkey John'
+        @session.find(:monkey, 'paul').text.should == 'Monkey Paul'
+      end
+    end
+
     context "with css as default selector" do
       before { Capybara.default_selector = :css }
       it "should find the first element using the given locator" do

lib/capybara/spec/views/with_html.erb

@@ -41,3 +41,8 @@
   <div id="hidden_via_ancestor">Inside element with hidden ancestor</div>
   <a href="/with_simple_html" title="awesome title" class="simple">hidden link</a>
 </div>
+
+<ul>
+  <li id="john_monkey">Monkey John</li>
+  <li id="paul_monkey">Monkey Paul</li>
+</ul>