vendor/rails/activesupport/lib/active_support/core_ext/bigdecimal/conversions.rb

   1 require 'yaml'
   2
   3 module ActiveSupport #:nodoc:
   4   module CoreExtensions #:nodoc:
   5     module BigDecimal #:nodoc:
   6       module Conversions
   7         DEFAULT_STRING_FORMAT = 'F'.freeze
   8         YAML_TAG = 'tag:yaml.org,2002:float'.freeze
   9         YAML_MAPPING = { 'Infinity' => '.Inf', '-Infinity' => '-.Inf', 'NaN' => '.NaN' }
  10
  11         def self.included(base) #:nodoc:
  12           base.class_eval do
  13             alias_method :_original_to_s, :to_s
  14             alias_method :to_s, :to_formatted_s
  15
  16             yaml_as YAML_TAG
  17           end
  18         end
  19
  20         def to_formatted_s(format = DEFAULT_STRING_FORMAT)
  21           _original_to_s(format)
  22         end
  23
  24         # This emits the number without any scientific notation.
  25         # This is better than self.to_f.to_s since it doesn't lose precision.
  26         #
  27         # Note that reconstituting YAML floats to native floats may lose precision.
  28         def to_yaml(opts = {})
  29           YAML.quick_emit(nil, opts) do |out|
  30             string = to_s
  31             out.scalar(YAML_TAG, YAML_MAPPING[string] || string, :plain)
  32           end
  33         end
  34       end
  35     end
  36   end
  37 end