Quick slapped together ruby class for parsing cisco router configuration files, only a start

cisco_config_parser.rb

class CiscoConfigParser
  def initialize(io)
    @io = io
  end
  def parse
    @io.each do |line|
      if line =~ /^\!$/ # terminate current block
        end_config
        next
      elsif line =~ /^\!/ # Comment
        next
      end

      parse_config(line)
    end
  end
  private
    def state
      @state ||= []
    end
    def end_config
      meth = ['e_config', state].flatten.join('_')
      send(meth) if respond_to?(meth)
      state.pop
    end
    def parse_config(line)
      cmd, opts = line.strip.split(' ', 2)
      meth, opts = meth_and_opts(cmd, opts)
      send(meth, opts) if respond_to?(meth)
    end
    def meth_and_opts(cmd, opts)
      return negated_meth_and_opts(opts) if cmd =~ /no/
      [['p_config', state, cmd.gsub('-', '_')].flatten.join('_'), opts]
    end
    def negated_meth_and_opts(line)
      cmd, opts = line.split(' ', 2)
      [['n_config', state, cmd.gsub('-', '_')].flatten.join('_'), opts]
    end
  protected
    def p_config_vlan(ids)
      @current_vlan = {:ids => ids}
    end
    def e_config_vlan
      @vlans ||= {}
      @vlans[@current_vlan.delete(:ids)] = @current_vlan
    end
    def p_config_interface(name)
      state.push(:interface)
      @current_interface = {:id => name}
    end
    def e_config_interface
      @interfaces ||= {}
      @interfaces[@current_interface.delete(:id)] = @current_interface
    end
    def p_config_interface_description(str)
      @current_interface[:description] = str
    end
end

This is insane. But also awesome. Thanks!
Did you ever do any more? I'm expanding it now so I can compare the allowed vlans on two sets of core routers.