lib/page_rankr/backlinks.rb in PageRankr-1.1.0 vs lib/page_rankr/backlinks.rb in PageRankr-1.2.0

@@ -2,10 +2,12 @@
 require 'cgi'
 require 'nokogiri'
 
 module PageRankr
   class Backlinks
+    SEARCH_ENGINES = [:google, :bing, :yahoo, :altavista, :alltheweb, :alexa]
+    
     SEARCH_ENGINE_URLS = {
       :google    => "http://www.google.com/search?q=link%3A",
       :bing      => "http://www.bing.com/search?q=link%3A",
       :yahoo     => "http://siteexplorer.search.yahoo.com/search?p=",
       :altavista => "http://www.altavista.com/web/results?q=link%3A",
@@ -21,9 +23,11 @@
       :alltheweb => "//span[@class='ofSoMany']/text()",
       :alexa     => "//linksin/@num"
     }
 
     def self.lookup(site, *search_engines)
+      search_engines = SEARCH_ENGINES if search_engines.empty?
+      
       backlinks = {}
       search_engines.each do |engine|
         next unless SEARCH_ENGINE_URLS[engine]
         doc = Nokogiri::HTML(open(SEARCH_ENGINE_URLS[engine] + CGI.escape(site)))
         count = doc.at(SEARCH_EGNINE_PATHS[engine]).to_s