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require 'bigdecimal'
require 'yaml'

class BigDecimal
  YAML_TAG = 'tag:yaml.org,2002:float'
  YAML_MAPPING = { 'Infinity' => '.Inf', '-Infinity' => '-.Inf', 'NaN' => '.NaN' }

  yaml_as YAML_TAG

  # This emits the number without any scientific notation.
  # This is better than self.to_f.to_s since it doesn't lose precision.
  #
  # Note that reconstituting YAML floats to native floats may lose precision.
  def to_yaml(opts = {})
    YAML.quick_emit(nil, opts) do |out|
      string = to_s
      out.scalar(YAML_TAG, YAML_MAPPING[string] || string, :plain)
    end
  end

  def to_d
    self
  end

  DEFAULT_STRING_FORMAT = 'F'
  def to_formatted_s(format = DEFAULT_STRING_FORMAT)
    _original_to_s(format)
  end
  alias_method :_original_to_s, :to_s
  alias_method :to_s, :to_formatted_s
end
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