Class: Barcodes::Symbology::Code39ExtendedMod43

Inherits:
Code39Extended show all
Defined in:
lib/barcodes/symbology/code39extendedmod43.rb

Overview

Modulo 43 checksum version of Code 39 Extended

More info: en.wikipedia.org/wiki/Code_39

Instance Attribute Summary

Attributes inherited from Base

#alpha, #bar_height, #bar_width, #caption_height, #caption_size, #captioned, #color, #data

Instance Method Summary collapse

Methods inherited from Code39Extended

#_data, #valid?

Methods inherited from Code39

charset, #initialize, valueset

Methods inherited from Base

charset, #encoded_data, #height, #initialize, #quiet_zone_width, #valid?, valueset, #width

Constructor Details

This class inherits a constructor from Barcodes::Symbology::Code39

Instance Method Details

#caption_data ⇒ Object

Returns caption data without checksum



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# File 'lib/barcodes/symbology/code39extendedmod43.rb', line 18

def caption_data
  @start_character + @data + @stop_character
end

#checksum ⇒ Object

Calculates the checksum using the provided data



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# File 'lib/barcodes/symbology/code39extendedmod43.rb', line 31

def checksum
  if valid?
    sum = 0
    self._data.each_char do |char|
      if ('0'..'9').include? char
        sum += char.to_i
      elsif ('A'..'Z').include? char
        sum += ('A'..'Z').to_a.index(char) + 10
      else
        case char
        when '-'
          sum += 36
        when '.'
          sum += 37
        when ' '
          sum += 38
        when '$'
          sum += 39
        when '/'
          sum += 40
        when '+'
          sum += 41
        when '%'
          sum += 42
        end
      end
    end

    value = sum % 43

    if (0..9).include? value
      return value.to_s
    elsif value >= 10 && value < 36
      return ('A'..'Z').to_a.fetch(value - 10)
    else
      case value
      when 36
        return '-'
      when 37
        return '.'
      when 38
        return ' '
      when 39
        return '$'
      when 40
        return '/'
      when 41
        return '+'
      when 42
        return '%'
      end
    end
  end
end

#formatted_data ⇒ Object

Start character + prepared data + checksum + stop character



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# File 'lib/barcodes/symbology/code39extendedmod43.rb', line 23

def formatted_data
  checksum = self.checksum
  unless checksum.nil?
    @start_character + self._data + checksum + @stop_character
  end
end