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code_128.rb
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code_128.rb
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#encoding: ASCII
require 'barby/barcode'
module Barby
#Code 128 barcodes
#
#Note that you must provide a type for each object, either by passing a string
#as a second parameter to Code128.new or by instantiating one of the child classes.
#
#You can switch type by using the CODEA, CODEB and CODEC characters:
#
# "\305" => A
# "\306" => B
# "\307" => C
#
#As an example, here's one that starts out as type A and then switches to B and then C:
#
# Code128A.new("ABC123\306def\3074567")
#
#
#GS1-128/EAN-128/UCC-128
#
#To make a GS1-128 code, prefix the data with FNC1 and the Application Identifier:
#
# #AI=00, data=12345
# Code128.new("#{Code128::FNC1}0012345")
class Code128 < Barcode1D
FNC1 = "\xc1"
FNC2 = "\xc2"
FNC3 = "\xc3"
FNC4 = "\xc4"
CODEA = "\xc5"
CODEB = "\xc6"
CODEC = "\xc7"
SHIFT = "\xc8"
STARTA = "\xc9"
STARTB = "\xca"
STARTC = "\xcb"
STOP = '11000111010'
TERMINATE = '11'
ENCODINGS = {
0 => "11011001100", 1 => "11001101100", 2 => "11001100110",
3 => "10010011000", 4 => "10010001100", 5 => "10001001100",
6 => "10011001000", 7 => "10011000100", 8 => "10001100100",
9 => "11001001000", 10 => "11001000100", 11 => "11000100100",
12 => "10110011100", 13 => "10011011100", 14 => "10011001110",
15 => "10111001100", 16 => "10011101100", 17 => "10011100110",
18 => "11001110010", 19 => "11001011100", 20 => "11001001110",
21 => "11011100100", 22 => "11001110100", 23 => "11101101110",
24 => "11101001100", 25 => "11100101100", 26 => "11100100110",
27 => "11101100100", 28 => "11100110100", 29 => "11100110010",
30 => "11011011000", 31 => "11011000110", 32 => "11000110110",
33 => "10100011000", 34 => "10001011000", 35 => "10001000110",
36 => "10110001000", 37 => "10001101000", 38 => "10001100010",
39 => "11010001000", 40 => "11000101000", 41 => "11000100010",
42 => "10110111000", 43 => "10110001110", 44 => "10001101110",
45 => "10111011000", 46 => "10111000110", 47 => "10001110110",
48 => "11101110110", 49 => "11010001110", 50 => "11000101110",
51 => "11011101000", 52 => "11011100010", 53 => "11011101110",
54 => "11101011000", 55 => "11101000110", 56 => "11100010110",
57 => "11101101000", 58 => "11101100010", 59 => "11100011010",
60 => "11101111010", 61 => "11001000010", 62 => "11110001010",
63 => "10100110000", 64 => "10100001100", 65 => "10010110000",
66 => "10010000110", 67 => "10000101100", 68 => "10000100110",
69 => "10110010000", 70 => "10110000100", 71 => "10011010000",
72 => "10011000010", 73 => "10000110100", 74 => "10000110010",
75 => "11000010010", 76 => "11001010000", 77 => "11110111010",
78 => "11000010100", 79 => "10001111010", 80 => "10100111100",
81 => "10010111100", 82 => "10010011110", 83 => "10111100100",
84 => "10011110100", 85 => "10011110010", 86 => "11110100100",
87 => "11110010100", 88 => "11110010010", 89 => "11011011110",
90 => "11011110110", 91 => "11110110110", 92 => "10101111000",
93 => "10100011110", 94 => "10001011110", 95 => "10111101000",
96 => "10111100010", 97 => "11110101000", 98 => "11110100010",
99 => "10111011110", 100 => "10111101110", 101 => "11101011110",
102 => "11110101110", 103 => "11010000100", 104 => "11010010000",
105 => "11010011100"
}
VALUES = {
'A' => {
0 => " ", 1 => "!", 2 => "\"",
3 => "#", 4 => "$", 5 => "%",
6 => "&", 7 => "'", 8 => "(",
9 => ")", 10 => "*", 11 => "+",
12 => ",", 13 => "-", 14 => ".",
15 => "/", 16 => "0", 17 => "1",
18 => "2", 19 => "3", 20 => "4",
21 => "5", 22 => "6", 23 => "7",
24 => "8", 25 => "9", 26 => ":",
27 => ";", 28 => "<", 29 => "=",
30 => ">", 31 => "?", 32 => "@",
33 => "A", 34 => "B", 35 => "C",
36 => "D", 37 => "E", 38 => "F",
39 => "G", 40 => "H", 41 => "I",
42 => "J", 43 => "K", 44 => "L",
45 => "M", 46 => "N", 47 => "O",
48 => "P", 49 => "Q", 50 => "R",
51 => "S", 52 => "T", 53 => "U",
54 => "V", 55 => "W", 56 => "X",
57 => "Y", 58 => "Z", 59 => "[",
60 => "\\", 61 => "]", 62 => "^",
63 => "_", 64 => "\000", 65 => "\001",
66 => "\002", 67 => "\003", 68 => "\004",
69 => "\005", 70 => "\006", 71 => "\a",
72 => "\b", 73 => "\t", 74 => "\n",
75 => "\v", 76 => "\f", 77 => "\r",
78 => "\016", 79 => "\017", 80 => "\020",
81 => "\021", 82 => "\022", 83 => "\023",
84 => "\024", 85 => "\025", 86 => "\026",
87 => "\027", 88 => "\030", 89 => "\031",
90 => "\032", 91 => "\e", 92 => "\034",
93 => "\035", 94 => "\036", 95 => "\037",
96 => FNC3, 97 => FNC2, 98 => SHIFT,
99 => CODEC, 100 => CODEB, 101 => FNC4,
102 => FNC1, 103 => STARTA, 104 => STARTB,
105 => STARTC
}.invert,
'B' => {
0 => " ", 1 => "!", 2 => "\"", 3 => "#", 4 => "$", 5 => "%",
6 => "&", 7 => "'", 8 => "(", 9 => ")", 10 => "*", 11 => "+",
12 => ",", 13 => "-", 14 => ".", 15 => "/", 16 => "0", 17 => "1",
18 => "2", 19 => "3", 20 => "4", 21 => "5", 22 => "6", 23 => "7",
24 => "8", 25 => "9", 26 => ":", 27 => ";", 28 => "<", 29 => "=",
30 => ">", 31 => "?", 32 => "@", 33 => "A", 34 => "B", 35 => "C",
36 => "D", 37 => "E", 38 => "F", 39 => "G", 40 => "H", 41 => "I",
42 => "J", 43 => "K", 44 => "L", 45 => "M", 46 => "N", 47 => "O",
48 => "P", 49 => "Q", 50 => "R", 51 => "S", 52 => "T", 53 => "U",
54 => "V", 55 => "W", 56 => "X", 57 => "Y", 58 => "Z", 59 => "[",
60 => "\\", 61 => "]", 62 => "^", 63 => "_", 64 => "`", 65 => "a",
66 => "b", 67 => "c", 68 => "d", 69 => "e", 70 => "f", 71 => "g",
72 => "h", 73 => "i", 74 => "j", 75 => "k", 76 => "l", 77 => "m",
78 => "n", 79 => "o", 80 => "p", 81 => "q", 82 => "r", 83 => "s",
84 => "t", 85 => "u", 86 => "v", 87 => "w", 88 => "x", 89 => "y",
90 => "z", 91 => "{", 92 => "|", 93 => "}", 94 => "~", 95 => "\177",
96 => FNC3, 97 => FNC2, 98 => SHIFT, 99 => CODEC, 100 => FNC4,
101 => CODEA, 102 => FNC1, 103 => STARTA, 104 => STARTB,
105 => STARTC,
}.invert,
'C' => {
0 => "00", 1 => "01", 2 => "02", 3 => "03", 4 => "04", 5 => "05",
6 => "06", 7 => "07", 8 => "08", 9 => "09", 10 => "10", 11 => "11",
12 => "12", 13 => "13", 14 => "14", 15 => "15", 16 => "16", 17 => "17",
18 => "18", 19 => "19", 20 => "20", 21 => "21", 22 => "22", 23 => "23",
24 => "24", 25 => "25", 26 => "26", 27 => "27", 28 => "28", 29 => "29",
30 => "30", 31 => "31", 32 => "32", 33 => "33", 34 => "34", 35 => "35",
36 => "36", 37 => "37", 38 => "38", 39 => "39", 40 => "40", 41 => "41",
42 => "42", 43 => "43", 44 => "44", 45 => "45", 46 => "46", 47 => "47",
48 => "48", 49 => "49", 50 => "50", 51 => "51", 52 => "52", 53 => "53",
54 => "54", 55 => "55", 56 => "56", 57 => "57", 58 => "58", 59 => "59",
60 => "60", 61 => "61", 62 => "62", 63 => "63", 64 => "64", 65 => "65",
66 => "66", 67 => "67", 68 => "68", 69 => "69", 70 => "70", 71 => "71",
72 => "72", 73 => "73", 74 => "74", 75 => "75", 76 => "76", 77 => "77",
78 => "78", 79 => "79", 80 => "80", 81 => "81", 82 => "82", 83 => "83",
84 => "84", 85 => "85", 86 => "86", 87 => "87", 88 => "88", 89 => "89",
90 => "90", 91 => "91", 92 => "92", 93 => "93", 94 => "94", 95 => "95",
96 => "96", 97 => "97", 98 => "98", 99 => "99", 100 => CODEB, 101 => CODEA,
102 => FNC1, 103 => STARTA, 104 => STARTB, 105 => STARTC
}.invert
}
CONTROL_CHARACTERS = VALUES['A'].invert.values_at(*(64..95).to_a)
attr_reader :type
def initialize(data, type=nil)
if type
self.type = type
self.data = "#{data}"
else
self.type, self.data = self.class.determine_best_type_for_data("#{data}")
end
raise ArgumentError, 'Data not valid' unless valid?
end
def type=(type)
type = type.upcase
raise ArgumentError, 'type must be A, B or C' unless type =~ /^[ABC]$/
@type = type
end
def to_s
full_data
end
def data
@data
end
#Returns the data for this barcode plus that for the entire extra chain,
#excluding all change codes
def full_data
data + full_extra_data
end
#Returns the data for this barcode plus that for the entire extra chain,
#including all change codes prefixing each extra
def full_data_with_change_codes
data + full_extra_data_with_change_code
end
#Returns the full_data for the extra or an empty string if there is no extra
def full_extra_data
return '' unless extra
extra.full_data
end
#Returns the full_data for the extra with the change code for the extra
#prepended. If there is no extra, an empty string is returned
def full_extra_data_with_change_code
return '' unless extra
change_code_for(extra) + extra.full_data_with_change_codes
end
#Set the data for this barcode. If the barcode changes
#character set, an extra will be created.
def data=(data)
data, *extra = data.split(/([#{CODEA+CODEB+CODEC}])/n)
@data = data || ''
self.extra = extra.join unless extra.empty?
end
#An "extra" is present if the barcode changes character set. If
#a 128A barcode changes to C, the extra will be an instance of
#Code128C. Extras can themselves have an extra if the barcode
#changes character set again. It's like a linked list, and when
#there are no more extras, the barcode ends with that object.
#Most barcodes probably don't change charsets and don't have extras.
def extra
return @extra if defined?(@extra)
@extra = nil
end
#Set the extra for this barcode. The argument is a string starting with the
#"change character set" symbol. The string may contain several character
#sets, in which case the extra will itself have an extra.
def extra=(extra)
raise ArgumentError, "Extra must begin with \\305, \\306 or \\307" unless extra =~ /^[#{CODEA+CODEB+CODEC}]/n
type, data = extra[0,1], extra[1..-1]
@extra = class_for(type).new(data)
end
#Get an array of the individual characters for this barcode. Special
#characters like FNC1 will be present. Characters from extras are not
#present.
def characters
chars = data.split(//n)
if type == 'C'
result = []
count = 0
while count < chars.size
if chars[count] =~ /^\d$/
#If encountering a digit, next char/byte *must* be second digit in pair. I.e. if chars[count] is 5,
#chars[count+1] must be /[0-9]/, otherwise it's not valid
result << "#{chars[count]}#{chars[count+1]}"
count += 2
else
result << chars[count]
count += 1
end
end
result
else
chars
end
end
#Return the encoding of this barcode as a string of 1 and 0
def encoding
start_encoding+data_encoding+extra_encoding+checksum_encoding+stop_encoding
end
#Returns the encoding for the data part of this barcode, without any extras
def data_encoding
characters.map do |char|
encoding_for char
end.join
end
#Returns the data encoding of this barcode and extras.
def data_encoding_with_extra_encoding
data_encoding+extra_encoding
end
#Returns the data encoding of this barcode's extra and its
#extra until the barcode ends.
def extra_encoding
return '' unless extra
change_code_encoding_for(extra) + extra.data_encoding + extra.extra_encoding
end
#Calculate the checksum for the data in this barcode. The data includes
#data from extras.
def checksum
pos = 0
(numbers+extra_numbers).inject(start_num) do |sum,number|
pos += 1
sum + (number * pos)
end % 103
end
#Get the encoding for the checksum
def checksum_encoding
encodings[checksum]
end
#protected
#Returns the numeric values for the characters in the barcode in an array
def numbers
characters.map do |char|
values[char]
end
end
#Returns the numeric values for extras
def extra_numbers
return [] unless extra
[change_code_number_for(extra)] + extra.numbers + extra.extra_numbers
end
def encodings
ENCODINGS
end
#The start encoding starts the barcode
def stop_encoding
STOP+TERMINATE
end
#Find the encoding for the specified character for this barcode
def encoding_for(char)
encodings[values[char]]
end
def change_code_for_class(klass)
{Code128A => CODEA, Code128B => CODEB, Code128C => CODEC}[klass]
end
#Find the character that changes the character set to the one
#represented in +barcode+
def change_code_for(barcode)
change_code_for_class(barcode.class)
end
#Find the numeric value for the character that changes the character
#set to the one represented in +barcode+
def change_code_number_for(barcode)
values[change_code_for(barcode)]
end
#Find the encoding to change to the character set in +barcode+
def change_code_encoding_for(barcode)
encodings[change_code_number_for(barcode)]
end
def class_for(character)
self.class.class_for(character)
end
#Is the data in this barcode valid? Does a lookup of every character
#and checks if it exists in the character set. An empty data string
#will also be reported as invalid.
def valid?
characters.any? && characters.all?{|c| values.include?(c) }
end
def values
VALUES[type]
end
def start_character
case type
when 'A' then STARTA
when 'B' then STARTB
when 'C' then STARTC
end
end
def start_num
values[start_character]
end
def start_encoding
encodings[start_num]
end
CTRL_RE = /#{CONTROL_CHARACTERS.join('|')}/
LOWR_RE = /[a-z]/
DGTS_RE = /\d{4,}/
# pairs of digits and FNC1 characters
CODEC_CHARS_RE = /(?:\d{2}|#{FNC1}){2,}/
class << self
def class_for(character)
case character
when 'A' then Code128A
when 'B' then Code128B
when 'C' then Code128C
when CODEA then Code128A
when CODEB then Code128B
when CODEC then Code128C
end
end
#Insert code shift and switch characters where appropriate to get the
#shortest encoding possible
def apply_shortest_encoding_for_data(data)
extract_codec(data).map do |block|
if codec_segment?(block)
"#{CODEC}#{block}"
else
if control_before_lowercase?(block)
handle_code_a(block)
else
handle_code_b(block)
end
end
end.join
end
def determine_best_type_for_data(data)
data = apply_shortest_encoding_for_data(data)
type = case data.slice!(0)
when CODEA then 'A'
when CODEB then 'B'
when CODEC then 'C'
end
[type, data]
end
private
#Extract all CODEC segments from the data. 4 or more evenly numbered contiguous digits.
#
# # C A or B C A or B
# extract_codec("12345abc678910DEF11") => ["1234", "5abc", "678910", "DEF11"]
def extract_codec(data)
data.split(/
(^(?:#{CODEC_CHARS_RE})) # matches digits that appear at the beginning of the barcode
|
((?:#{CODEC_CHARS_RE})(?!\d)) # matches digits that appear later in the barcode
/x).reject(&:empty?)
end
def codec_segment?(data)
data =~ /\A#{CODEC_CHARS_RE}\Z/
end
def control_character?(char)
char =~ CTRL_RE
end
def lowercase_character?(char)
char =~ LOWR_RE
end
#Handle a Code A segment which may contain Code B parts, but may not
#contain any Code C parts.
def handle_code_a(data)
indata = data.dup
outdata = CODEA.dup #We know it'll be A
while char = indata.slice!(0)
if lowercase_character?(char) #Found a lower case character (Code B)
if control_before_lowercase?(indata)
outdata << SHIFT << char #Control character appears before a new lowercase, use shift
else
outdata << handle_code_b(char+indata) #Switch to Code B
break
end
else
outdata << char
end
end#while
outdata
end
#Handle a Code B segment which may contain Code A parts, but may not
#contain any Code C parts.
def handle_code_b(data)
indata = data.dup
outdata = CODEB.dup #We know this is going to start with Code B
while char = indata.slice!(0)
if control_character?(char) #Found a control character (Code A)
if control_before_lowercase?(indata) #There is another control character before any lowercase, so
outdata << handle_code_a(char+indata) #switch over to Code A.
break
else
outdata << SHIFT << char #Can use a shift to only encode this char as Code A
end
else
outdata << char
end
end#while
outdata
end
#Test str to see if a control character (Code A) appears
#before a lower case character (Code B).
#
#Returns true only if it contains a control character and a lower case
#character doesn't appear before it.
def control_before_lowercase?(str)
ctrl = str =~ CTRL_RE
char = str =~ LOWR_RE
ctrl && (!char || ctrl < char)
end
end#class << self
end#class Code128
class Code128A < Code128
def initialize(data)
super(data, 'A')
end
end
class Code128B < Code128
def initialize(data)
super(data, 'B')
end
end
class Code128C < Code128
def initialize(data)
super(data, 'C')
end
end
end