Refactoring nokogiri usage

lib/webrat/core.rb

@@ -1,3 +1,4 @@
+require "webrat/core/nokogiri"
 require "webrat/core/logging"
 require "webrat/core/flunk"
 require "webrat/core/form"

lib/webrat/core/matchers/have_content.rb

@@ -3,15 +3,15 @@ module Webrat
   
     class HasContent
       def initialize(content)
-        # Require nokogiri and fall back on rexml
+        # We need Nokogiri's CSS to XPath support, even if using REXML
+        require "nokogiri/css"
+        
         begin
           require "nokogiri"
-          require "webrat/nokogiri"
+          require "webrat/core/nokogiri"
         rescue LoadError => e
-          if require "rexml/document"
+          require "rexml/document"
-            require "webrat/vendor/nokogiri/css"
+          warn("Standard REXML library is slow. Please consider installing nokogiri.\nUse \"sudo gem install nokogiri\"")
-            warn("Standard REXML library is slow. Please consider installing nokogiri.\nUse \"sudo gem install nokogiri\"")
-          end
         end
         
         @content = content
@@ -38,7 +38,7 @@ module Webrat
       end
     
       def matches_nokogiri?(stringlike)
-        @document = nokogiri_document(stringlike)
+        @document = Webrat.nokogiri_document(stringlike)
         @element = @document.inner_text
       
         case @content
@@ -70,20 +70,6 @@ module Webrat
         end
       end
       
-      def nokogiri_document(stringlike)
-        return stringlike.dom if stringlike.respond_to?(:dom)
-        stringlike = stringlike.body.to_s if stringlike.respond_to?(:body)
-        
-        case stringlike
-        when Nokogiri::HTML::Document, Nokogiri::XML::NodeSet
-          stringlike
-        when StringIO
-          Nokogiri::HTML(stringlike.string)
-        else
-          Nokogiri::HTML(stringlike.to_s)
-        end
-      end
-      
       # ==== Returns
       # String:: The failure message.
       def failure_message

lib/webrat/core/matchers/have_xpath.rb

@@ -3,15 +3,16 @@ module Webrat
     
     class HaveXpath
       def initialize(expected, &block)
+        # We need Nokogiri's CSS to XPath support, even if using REXML
+        require "nokogiri/css"
+        
         # Require nokogiri and fall back on rexml
         begin
           require "nokogiri"
-          require "webrat/nokogiri"
+          require "webrat/core/nokogiri"
         rescue LoadError => e
-          if require "rexml/document"
+          require "rexml/document"
-            require "webrat/vendor/nokogiri/css"
+          warn("Standard REXML library is slow. Please consider installing nokogiri.\nUse \"sudo gem install nokogiri\"")
-            warn("Standard REXML library is slow. Please consider installing nokogiri.\nUse \"sudo gem install nokogiri\"")
-          end
         end
       
         @expected = expected
@@ -36,7 +37,7 @@ module Webrat
       end
     
       def matches_nokogiri?(stringlike)
-        @document = nokogiri_document(stringlike)
+        @document = Webrat.nokogiri_document(stringlike)
         @document.xpath(*query).any?
       end
     
@@ -61,20 +62,6 @@ module Webrat
         end
       end
       
-      def nokogiri_document(stringlike)
-        return stringlike.dom if stringlike.respond_to?(:dom)
-        stringlike = stringlike.body.to_s if stringlike.respond_to?(:body)
-        
-        case stringlike
-        when Nokogiri::HTML::Document, Nokogiri::XML::NodeSet
-          stringlike
-        when StringIO
-          Nokogiri::HTML(stringlike.string)
-        else
-          Nokogiri::HTML(stringlike.to_s)
-        end
-      end
-      
       def query
         [@expected].flatten.compact
       end

lib/webrat/core/nokogiri.rb

@@ -0,0 +1,34 @@
+module Webrat
+  
+  def self.nokogiri_document(stringlike)
+    return stringlike.dom if stringlike.respond_to?(:dom)
+    
+    if stringlike === Nokogiri::HTML::Document || stringlike === Nokogiri::XML::NodeSet
+      stringlike
+    elsif stringlike === StringIO
+      Nokogiri::HTML(stringlike.string)
+    elsif stringlike.respond_to?(:body)
+      Nokogiri::HTML(stringlike.body.to_s)
+    else
+      Nokogiri::HTML(stringlike.to_s)
+    end
+  end
+  
+end
+
+
+module Nokogiri
+  module CSS
+    class XPathVisitor
+      
+      def visit_pseudo_class_text(node)
+        "@type='text'"
+      end
+
+      def visit_pseudo_class_password(node)
+        "@type='password'"
+      end
+      
+    end
+  end
+end

lib/webrat/core/scope.rb

@@ -169,7 +169,7 @@ module Webrat
     def page_dom
       return @response.dom if @response.respond_to?(:dom)
         
-      dom = Nokogiri::HTML(@response_body)
+      dom = Webrat.nokogiri_document(@response_body)
       
       @response.meta_class.send(:define_method, :dom) do
         dom
@@ -179,7 +179,7 @@ module Webrat
     end
     
     def scoped_dom
-      Nokogiri::HTML(@scope.dom.search(@selector).first.to_html)
+      Webrat.nokogiri_document(@scope.dom.search(@selector).first.to_html)
     end
     
     def locate_field(field_locator, *field_types)

lib/webrat/nokogiri.rb

@@ -1,15 +0,0 @@
-module Nokogiri
-  module CSS
-    class XPathVisitor
-      
-      def visit_pseudo_class_text(node)
-        "@type='text'"
-      end
-
-      def visit_pseudo_class_password(node)
-        "@type='password'"
-      end
-      
-    end
-  end
-end

spec/webrat/core/field_spec.rb

@@ -3,12 +3,12 @@ require File.expand_path(File.dirname(__FILE__) + "/../../spec_helper")
 module Webrat
   describe CheckboxField do
     it "should say it is checked if it is" do
-      checkbox = CheckboxField.new(nil, (Nokogiri::HTML("<input type='checkbox' checked='checked'>")/'input').first)
+      checkbox = CheckboxField.new(nil, (Webrat.nokogiri_document("<input type='checkbox' checked='checked'>")/'input').first)
       checkbox.should be_checked
     end
 
     it "should say it is not checked if it is not" do
-      checkbox = CheckboxField.new(nil, (Nokogiri::HTML("<input type='checkbox'>")/'input').first)
+      checkbox = CheckboxField.new(nil, (Webrat.nokogiri_document("<input type='checkbox'>")/'input').first)
       checkbox.should_not be_checked
     end
   end