http://d.hatena.ne.jp/gyuque/20101015 を参考に jQuery 読み込みとかオレオレ拡張いれた mozrepl.rb

mozrepl.rb

require 'net/telnet'
require 'rubygems'
require 'json'

# for ruby 1.9.2-p0
class Net::Telnet
  def method_missing(m, *args, &block)
    @sock.__send__(m, *args, &block)
  end
end

class MozRepl
  def self.start(second=5, prompt=/^repl> /, host="localhost", port=4242)
    mozRepl = MozRepl.new(second,prompt,host,port)
    mozRepl.wait
    yield mozRepl
    mozRepl.close
  end

  def initialize(second=5, prompt=/^repl> /, host="localhost", port=4242)
    @second = second
    @prompt = prompt
    @telnet = Net::Telnet::new(
      "Host" => host,
      "Port" => port,
      "Prompt" => @prompt
    )
  end

  def wait
    @telnet.waitfor(@prompt)
  end

  def close
    @telnet.close
  end

  def inject(url, script, with_jquery = false)
    @telnet.cmd("content.location.href = 'about:blank'")

    @telnet.cmd("content.location.href = '#{url}'")
    if wait_load
      @telnet.cmd("repl.enter(content)")
      if with_jquery
        STDERR.puts("Inject jQuery")
        @telnet.cmd(<<JQUERY)
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.charset = 'UTF-8';
  script.src = 'http://code.jquery.com/jquery-1.4.3.min.js';
  document.body.appendChild(script);
JQUERY
        sleep 2
      end
      @telnet.cmd("repl.print( (function(){\n#{script}\n})() )") {|c|
        result = c.gsub(@prompt, "")
        yield result
      }
      @telnet.cmd("repl.back()")
    end
  end

  private
  def wait_load
    loaded = false
    STDERR.puts("Wait for load...")

    @second.times{|i|
      curloc = nil
      @telnet.cmd("content.location.href") do |c|
        curloc = c.gsub(@prompt,"")
      end

      if curloc != "about:blank"
        loaded = true
      end

      STDERR.print("\b#{@second-1-i}")
      sleep 0.5
    }

    STDERR.puts("\bdone")
    return loaded
  end
end

script =<<SCRIPT
  var result = $("ul.rg_ul:first img.rg_i").map(function(){
    return this.src;
  });
  return JSON.stringify($.makeArray(result));
SCRIPT

links = nil
MozRepl.start do |mozRepl|
  mozRepl.inject("http://www.google.co.jp/images?q=richard+d.+james+album",script,true) do |json|
    puts json
    unless json.empty?
      links = JSON.parse(json)
    end
  end
end
puts links