Class: Barby::UPCSupplemental

Inherits:
Barcode1D show all
Defined in:
lib/barby/barcode/upc_supplemental.rb

Constant Summary collapse

FORMAT = 
/^\d\d\d\d\d$|^\d\d$/
START = 
'1011'
SEPARATOR = 
'01'
ODD = 
:odd
EVEN = 
:even
PARITY_MAPS = 
{
  2 => {
    0 => [ODD, ODD],
    1 => [ODD, EVEN],
    2 => [EVEN, ODD],
    3 => [EVEN, EVEN]
  },
  5 => {
    0 => [EVEN, EVEN, ODD, ODD, ODD],
    1 => [EVEN, ODD, EVEN, ODD, ODD],
    2 => [EVEN, ODD, ODD, EVEN, ODD],
    3 => [EVEN, ODD, ODD, ODD, EVEN],
    4 => [ODD, EVEN, EVEN, ODD, ODD],
    5 => [ODD, ODD, EVEN, EVEN, ODD],
    6 => [ODD, ODD, ODD, EVEN, EVEN],
    7 => [ODD, EVEN, ODD, EVEN, ODD],
    8 => [ODD, EVEN, ODD, ODD, EVEN],
    9 => [ODD, ODD, EVEN, ODD, EVEN]
  }
}
ENCODINGS = 
{
  ODD => EAN13::LEFT_ENCODINGS_ODD,
  EVEN => EAN13::LEFT_ENCODINGS_EVEN
}
NO_PRICE =

The book doesn’t have a suggested retail price

new('90000')
COMPLIMENTARY =

The book is complimentary (~free)

new('99991')
USED =

The book is marked as used

new('99990')

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Barcode

#method_missing, #outputter_class_for, #outputter_for, outputters, register_outputter, #two_dimensional?

Constructor Details

#initialize(data) ⇒ UPCSupplemental

Returns a new instance of UPCSupplemental.



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# File 'lib/barby/barcode/upc_supplemental.rb', line 46

def initialize(data)
  self.data = data
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Barby::Barcode

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/barby/barcode/upc_supplemental.rb', line 9

def data
  @data
end

Instance Method Details

#characters ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 64

def characters
  data.split(//)
end

#checksum ⇒ Object

Checksum is different for 2 and 5 digits 2-digits don’t really have a checksum, just a remainder to look up the parity



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# File 'lib/barby/barcode/upc_supplemental.rb', line 95

def checksum
  if two_digit?
    data.to_i % 4
  elsif five_digit?
    (odd_sum + even_sum) % 10
  end
end

#digits ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 68

def digits
  characters.map{|c| c.to_i }
end

#encoded_characters ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 110

def encoded_characters
  parity_map.zip(digits).map do |parity, digit|
    ENCODINGS[parity][digit]
  end
end

#encoding ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 117

def encoding
  START + encoded_characters.join(SEPARATOR)
end

#even_digits ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 79

def even_digits
  alternater = true
  digits.reverse.select{ alternater = !alternater }
end

#even_sum ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 88

def even_sum
  even_digits.inject(0){|s,d| s + d * 9 }
end

#five_digit? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/barby/barcode/upc_supplemental.rb', line 59

def five_digit?
  size == 5
end

#odd_digits ⇒ Object

Odd and even methods are only useful for 5 digits



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# File 'lib/barby/barcode/upc_supplemental.rb', line 74

def odd_digits
  alternater = false
  digits.reverse.select{ alternater = !alternater }
end

#odd_sum ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 84

def odd_sum
  odd_digits.inject(0){|s,d| s + d * 3 }
end

#parity_map ⇒ Object

Parity maps are different for 2 and 5 digits



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# File 'lib/barby/barcode/upc_supplemental.rb', line 105

def parity_map
  PARITY_MAPS[size][checksum]
end

#size ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 51

def size
  data.size
end

#to_s ⇒ Object 



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# File 'lib/barby/barcode/upc_supplemental.rb', line 127

def to_s
  data
end

#two_digit? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/barby/barcode/upc_supplemental.rb', line 55

def two_digit?
  size == 2
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/barby/barcode/upc_supplemental.rb', line 122

def valid?
  data =~ FORMAT
end