added the basic file parsing and building of the domain tree

lib/domainatrix.rb

@@ -0,0 +1,7 @@
+$LOAD_PATH.unshift(File.dirname(__FILE__)) unless $LOAD_PATH.include?(File.dirname(__FILE__))
+
+require 'domainatrix/domain_parser.rb'
+
+module Domainatrix
+  VERSION = "0.0.1"
+end

lib/domainatrix/domain_parser.rb

@@ -0,0 +1,24 @@
+module Domainatrix
+  class DomainParser
+    attr_reader :tlds
+
+    def initialize(file_name)
+      @tlds = {}
+      read_dat_file(file_name)
+    end
+
+    def read_dat_file(file_name)
+      File.readlines(file_name).each do |line|
+        line = line.strip
+        unless line.start_with? "//" || line.empty?
+          parts = line.split(".").reverse
+
+          sub_hash = @tlds
+          parts.each do |part|
+            sub_hash = (sub_hash[part] ||= {})
+          end
+        end
+      end
+    end
+  end
+end

spec/domainatrix/domain_parser_spec.rb

@@ -0,0 +1,25 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe "domain parser" do
+  before(:all) do
+    @domain_parser = Domainatrix::DomainParser.new("#{File.dirname(__FILE__)}/../../lib/effective_tld_names.dat")
+  end
+
+  describe "reading the dat file" do
+    it "create a trie of the domain names" do
+      @domain_parser.tlds.should be_a Hash
+    end
+
+    it "should have the first level of the tree" do
+      @domain_parser.tlds.should have_key("com")
+    end
+
+    it "should have the first level of the tree even when the first doesn't appear on a line by itself" do
+      @domain_parser.tlds.should have_key("uk")
+    end
+
+    it "should have lower levels of the tree" do
+      @domain_parser.tlds["jp"].should have_key("ac")
+    end
+  end
+end