Module: Pio::RubyDumper

Included in:
EthernetFrame, EthernetHeader, IPv4Header, Message
Defined in:
lib/pio/ruby_dumper.rb

Overview

defines to_ruby method

Instance Method Summary collapse

Instance Method Details

#to_ruby ⇒ Object

Returns a Ruby code representation of this packet, such that it can be eval’ed and sent later.

rubocop:disable AbcSize rubocop:disable MethodLength rubocop:disable CyclomaticComplexity rubocop:disable PerceivedComplexity



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# File 'lib/pio/ruby_dumper.rb', line 13

def to_ruby
  pack_template = ''
  bytes = ''
  bit = false
  bit_names = []
  total_bit_length = 0
  field_names.each do |each|
    next unless __send__("#{each}?")
    if /Bit(\d+)$/ =~ __send__(each).class.to_s
      bit_length = Regexp.last_match(1).to_i
      total_bit_length += bit_length
      if bit
        bit_names << each
        bytes << format("_%0#{bit_length}b", __send__(each))
      else
        bit_names = [each]
        bytes << format("  0b%0#{bit_length}b", __send__(each))
      end
      bit = true
    else
      if bit
        bytes << ", # #{bit_names.join(', ')}\n"
        if total_bit_length == 8
          pack_template << 'C'
        elsif total_bit_length == 16
          pack_template << 'n'
        else
          raise
        end
        total_bit_length = 0
        bit_names = []
        bit = false
      end
      list = (@format || self).__send__(each).to_bytes
      next if list.empty?
      bytes << "  #{list}, # #{each}\n"
      pack_template << 'C' * (list.count(',') + 1)
    end
  end.compact

  template = ''
  until pack_template.empty?
    if /^(.)(\1+)/ =~ pack_template
      pack_template.sub!(/^(.)(\1+)/, '')
      template <<
        "#{Regexp.last_match(1)}#{Regexp.last_match(2).length + 1}"
    else
      pack_template.sub!(/^(.)/, '')
      template << Regexp.last_match(1)
    end
  end
  "[\n#{bytes}].pack('#{template}')"
end