added the basic url canonicalization and representation code

lib/domainatrix.rb

@@ -1,6 +1,7 @@
 $LOAD_PATH.unshift(File.dirname(__FILE__)) unless $LOAD_PATH.include?(File.dirname(__FILE__))
 
 require 'domainatrix/domain_parser.rb'
+require 'domainatrix/url.rb'
 
 module Domainatrix
   VERSION = "0.0.1"

lib/domainatrix/url.rb

@@ -0,0 +1,27 @@
+module Domainatrix
+  class Url
+    attr_reader :tld, :domain, :subdomain, :path
+
+    def initialize(attrs = {})
+      @tld = attrs[:tld]
+      @domain = attrs[:domain]
+      @subdomain = attrs[:subdomain]
+      @path = attrs[:path]
+    end
+
+    def canonical(options = {})
+      url = "#{@tld}.#{@domain}"
+      if @subdomain
+        if options[:include_www]
+          url << ".#{@subdomain}"
+        else
+          sub_without_www = @subdomain.gsub(/^www/, "")
+          url << (sub_without_www.start_with?(".") ? sub_without_www : ".#{sub_without_www}") unless sub_without_www.empty?
+        end
+      end
+      url << @path if @path
+
+      url
+    end
+  end
+end

spec/domainatrix/url_spec.rb

@@ -0,0 +1,36 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe "url" do
+  it "has the tld" do
+    Domainatrix::Url.new(:tld => "net").tld.should == "net"
+  end
+
+  it "has the domain" do
+    Domainatrix::Url.new(:domain => "pauldix").domain.should == "pauldix"
+  end
+
+  it "has the subdomain" do
+    Domainatrix::Url.new(:subdomain => "foo").subdomain.should == "foo"
+  end
+
+  it "has the path" do
+    Domainatrix::Url.new(:path => "/asdf.html").path.should == "/asdf.html"
+  end
+
+  it "canonicalizes the url without www" do
+    Domainatrix::Url.new(:subdomain => "www", :domain => "pauldix", :tld => "net").canonical.should == "net.pauldix"
+    Domainatrix::Url.new(:subdomain => "www.foo", :domain => "pauldix", :tld => "net").canonical.should == "net.pauldix.foo"
+  end
+
+  it "canonicalizes the url with www" do
+    Domainatrix::Url.new(:subdomain => "www", :domain => "pauldix", :tld => "net").canonical(:include_www => true).should == "net.pauldix.www"
+  end
+
+  it "canonicalizes the url with the path" do
+    Domainatrix::Url.new(:subdomain => "foo", :domain => "pauldix", :tld => "net", :path => "/hello").canonical.should == "net.pauldix.foo/hello"
+  end
+
+  it "canonicalizes the url without the path" do
+    Domainatrix::Url.new(:subdomain => "foo", :domain => "pauldix", :tld => "net").canonical(:include_path => false).should == "net.pauldix.foo"
+  end
+end