# File lib/versionomy/format_definitions/rubygems.rb, line 254
      def self.create_standard_to_rubygems

        # We'll use a parsing conversion.
        Conversion::Parsing.new do

          # We're going to modify how the standard format version is
          # unparsed, so the rubygems format will have a better chance
          # of parsing it.
          to_modify_unparse_params do |params_, convert_params_|

            params_ ||= {}

            # If the standard format version has a prerelease notation,
            # make sure it is set off using a delimiter that the rubygems
            # format can recognize. So instead of "1.0b2", we force the
            # unparsing to generate "1.0.b.2".
            params_[:release_type_delim] = '.'
            params_[:development_version_delim] = '.'
            params_[:alpha_version_delim] = '.'
            params_[:beta_version_delim] = '.'
            params_[:release_candidate_version_delim] = '.'
            params_[:preview_version_delim] = '.'

            # If the standard format version has a patchlevel notation,
            # force it to use the default number rather than letter style.
            # So instead of "1.2c", we force the unparsing to generate
            # "1.2-3".
            params_[:patchlevel_style] = nil

            # If the standard format version has a patchlevel notation,
            # force it to use the default delimiter of "-" so the rubygems
            # format will recognize it. So instead of "1.9.1p243", we force
            # the unparsing to generate "1.9.1-243".
            params_[:patchlevel_delim] = nil

            # If the standard format version includes a "v" prefix, strip
            # it because rubygems doesn't like it.
            params_[:major_delim] = nil

            params_
          end

          # Standard formats sometimes allow hyphens and spaces in field
          # delimiters, but the rubygems format requires periods. So modify
          # the unparsed string to conform to rubygems's expectations.
          to_modify_string do |str_, convert_params_|
            str_.gsub(/[\.\s-]+/, '.')
          end

        end

      end