class csser
  constructor: (@style...,@selection) ->
    @json2style()

  json2style: () =>
    ###
    Apply an object of styles to a selection
    ###
    if @style
      @selection.style @style[0]

  style2json: () =>
    ###
    Requires CSSJSON
    Return an object
    ###
    CSSJSON.toJSON @selection.attr 'style'

  clear: () =>
    ###
    clear the style on the current selection
    ###
    @selection.attr 'style', null


d3.selection.prototype.css = (style)->
    style = d3.functor style
    @.each (d,i) ->
      new csser style(d,i), d3.select(@)