noko_hash.rb

require 'rubygems'
require 'nokogiri'
require 'activesupport'

class NokoHash
  def self.from_s(str)
    self.new(Nokogiri::XML(str))
  end

  def initialize(doc)
    @doc = doc.class.name =~ /::Document$/ ? doc.root : doc
  end

  def [](key)
    els = case key
    when Fixnum
      @doc.at(key)
    else
      @doc.xpath(key.to_s, key.to_s.camelize)
    end
    
    value_or_hash(els)
  end

  def method_missing(meth, *args, &block)
    return value_or_hash(@doc.send(meth, *args, &block)) if @doc.respond_to?(meth)
    self[meth.to_s.camelize]
  end

  def value_or_hash(els)
    return els.first.content if els.respond_to?(:size) && els.size == 1 && els.first.children.size == 1
    return nil if els.respond_to?(:size) && els.size == 1 && els.first.children.size == 0
    return els.present? ? NokoHash.new(els) : nil if els.class.name =~ /^Nokogiri::/
    
    els
  end

  def each(&block)
    @doc.each {|el| block.call(NokoHash.new(el))}
  end

  def map(&block)
    @doc.map {|el| block.call(NokoHash.new(el))}
  end
  alias :collect :map
end