self enclosed js that removes unmentionables from DOM

blaster.rb

# encoding: UTF-8

require 'uri'
require 'uglifier'
require 'coffee-script'

js = CoffeeScript.compile DATA.read
#plain js
puts js
#bookmarklet
puts URI.encode('javascript:' + Uglifier.compile(js))
#coffee script source ↓
__END__
Blaster =
  empty: (element) ->
    if document.documentElement.contains element
      element.parentNode.removeChild element
    return
  query: (selector) ->
    #convert NodeList to Array
    Array::slice.call document.querySelectorAll selector
Blaster.query('a img').map (i) ->
  #if image is not a link to the current domain then remove
  parent = i.parentNode
  if parent?
    parent = parent.parentNode until parent.nodeName.toLowerCase() == 'a'
    Blaster.empty(parent) if parent.hostname != window.location.host
    return
Blaster.query('img[onclick],iframe,object,video').map (i) ->
  i.parentNode.removeChild i
  return