indent normalization

class IndentManager
  def initialize
    @indents = []
    @parse_complete = false
  end

  def register_indent(indent)
    @indents << indent
  end

  def parse_complete!
    @parse_complete = true
  end

  def normalize(value)
    value * normalization_factor
  end

  private

  def normalization_factor
    raise RuntimeError.new("you can't normalize until you have finished parsing") unless @parse_complete
    @normalization_factor ||= compute_normalization_factor
  end

  def compute_normalization_factor
    # loop through @indents and figure out normalization
  end
end

class Indent
  def initialize(value, indent_manager)
    @value = value
    @indent_manager = indent_manager
    @indent_manager.register_indent(self)
  end

  def unnormalised
    @value
  end

  def normalized
    @indent_manager.normalize(value)
  end
end