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require "barby/barcode"
module Barby
# https://en.wikipedia.org/wiki/Codabar
class Codabar < Barcode1D
BLACK_NARROW_WIDTH = 1
WHITE_NARROW_WIDTH = 2
WIDE_WIDTH_RATE = 3
SPACING = 5 # must be equal to or wider than white narrow width
CHARACTERS = "0123456789-$:/.+ABCD".freeze
# even: black, odd: white
# 0: narrow, 1: wide
BINARY_EXPRESSION = [
"0000011", # 0
"0000110", # 1
"0001001", # 2
"1100000", # 3
"0010010", # 4
"1000010", # 5
"0100001", # 6
"0100100", # 7
"0110000", # 8
"1001000", # 9
"0001100", # -
"0011000", # $
"1000101", # :
"1010001", # /
"1010100", # .
"0010101", # +
"0011010", # A
"0101001", # B
"0001011", # C
"0001110", # D
].each(&:freeze)
CHARACTER_TO_BINARY = Hash[CHARACTERS.chars.zip(BINARY_EXPRESSION)].freeze
FORMAT = /\A[ABCD][0123456789\-\$:\/\.\+]+[ABCD]\z/.freeze
ONE = "1".freeze
ZERO = "0".freeze
attr_accessor :data, :black_narrow_width, :white_narrow_width, :wide_width_rate, :spacing
def initialize(data)
self.data = data
raise ArgumentError, 'data not valid' unless valid?
self.black_narrow_width = BLACK_NARROW_WIDTH
self.white_narrow_width = WHITE_NARROW_WIDTH
self.wide_width_rate = WIDE_WIDTH_RATE
self.spacing = SPACING
end
def encoding
data.chars.map{|c| binary_to_bars(CHARACTER_TO_BINARY[c]) }.join(ZERO * spacing)
end
def valid?
data =~ FORMAT
end
private
def binary_to_bars(bin)
bin.chars.each_with_index.map{|c, i|
black = i % 2 == 0
narrow = c == ZERO
if black
if narrow
ONE * black_narrow_width
else
ONE * (black_narrow_width * wide_width_rate).to_i
end
else
if narrow
ZERO * white_narrow_width
else
ZERO * (white_narrow_width * wide_width_rate).to_i
end
end
}.join
end
end
end
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