Contents

require 'hexdump/format_string'

module Hexdump
  module Numeric
    #
    # @api private
    #
    # @since 1.0.0
    #
    class Hexadecimal < FormatString

      INT_SIZE_TO_WIDTH = {
        1 => 2, # 0xff.to_s(16).length
        2 => 4, # 0xffff.to_s(16).length
        4 => 8, # 0xffffffff.to_s(16).length
        8 => 16 # 0xffffffffffffffff.to_s(16).length
      }

      FLOAT_WIDTH = 20

      # @return [Integer]
      attr_reader :width

      #
      # Initializes the hexadecimal format.
      #
      # @param [Type::Int, Type::UInt, Type::Float] type
      #
      def initialize(type)
        case type
        when Type::Float
          if RUBY_ENGINE == 'jruby'
            # XXX: https://github.com/jruby/jruby/issues/5122
            begin
              "%a" % 1.0
            rescue ArgumentError
              raise(NotImplementedError,"jruby #{RUBY_ENGINE_VERSION} does not support the \"%a\" format string")
            end
          end

          # NOTE: jruby does not currently support the %a format string
          @width = FLOAT_WIDTH
          super("% #{@width}a"); @width += 1
        else
          @width = INT_SIZE_TO_WIDTH.fetch(type.size) do
            raise(NotImplementedError,"type #{type} with unsupported size #{type.size}")
          end

          if type.signed?
            super("% .#{@width}x"); @width += 1
          else
            super("%.#{@width}x")
          end
        end
      end

    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
hexdump-1.0.0	lib/hexdump/numeric/hexadecimal.rb