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require 'barby/barcode/code_25'
module Barby
#Code 2 of 5 interleaved. Same as standard 2 of 5, but spaces are used
#for encoding as well as the bars. Each pair of numbers get interleaved,
#that is, the first is encoded in the bars and the second is encoded
#in the spaced. This means an interleaved 2/5 barcode must have an even
#number of digits.
class Code25Interleaved < Code25
START_ENCODING = [N,N,N,N]
STOP_ENCODING = [W,N,N]
def digit_pairs(d=nil)
(d || digits).inject [] do |ary,d|
ary << [] if !ary.last || ary.last.size == 2
ary.last << d
ary
end
end
def digit_pairs_with_checksum
digit_pairs(digits_with_checksum)
end
def digit_encodings
raise_invalid unless valid?
digit_pairs.map{|p| encoding_for_pair(p) }
end
def digit_encodings_with_checksum
digit_pairs_with_checksum.map{|p| encoding_for_pair(p) }
end
def encoding_for_pair(pair)
bars, spaces = ENCODINGS[pair.first], ENCODINGS[pair.last]
encoding_for_interleaved(bars.zip(spaces))
end
#Encodes an array of interleaved W or N bars and spaces
#ex: [W,N,W,W,N,N] => "111011100010"
def encoding_for_interleaved(*bars_and_spaces)
bar = false#starts with bar
bars_and_spaces.flatten.inject '' do |enc,bar_or_space|
bar = !bar
enc << (bar ? '1' : '0') * (bar_or_space == WIDE ? wide_width : narrow_width)
end
end
def start_encoding
encoding_for_interleaved(START_ENCODING)
end
def stop_encoding
encoding_for_interleaved(STOP_ENCODING)
end
def valid?
# When checksum is included, it's included when determining "evenness"
super && digits.size % 2 == (include_checksum? ? 1 : 0)
end
end
end
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