|
1
|
|
|
// Encoding documentation: |
|
2
|
|
|
// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Binary_encoding_of_data_digits_into_EAN-13_barcode |
|
3
|
|
|
|
|
4
|
|
|
import EANencoder from './ean_encoder.js'; |
|
5
|
|
|
import Barcode from "../Barcode.js"; |
|
6
|
|
|
|
|
7
|
|
|
class EAN13 extends Barcode{ |
|
8
|
|
|
constructor(data, options){ |
|
9
|
|
|
// Add checksum if it does not exist |
|
10
|
|
|
if(data.search(/^[0-9]{12}$/) !== -1){ |
|
11
|
|
|
data += checksum(data); |
|
12
|
|
|
} |
|
13
|
|
|
|
|
14
|
|
|
super(data, options); |
|
15
|
|
|
|
|
16
|
|
|
// Make sure the font is not bigger than the space between the guard bars |
|
17
|
|
|
if(!options.flat && options.fontSize > options.width * 10){ |
|
18
|
|
|
this.fontSize = options.width * 10; |
|
19
|
|
|
} |
|
20
|
|
|
else{ |
|
21
|
|
|
this.fontSize = options.fontSize; |
|
22
|
|
|
} |
|
23
|
|
|
|
|
24
|
|
|
// Make the guard bars go down half the way of the text |
|
25
|
|
|
this.guardHeight = options.height + this.fontSize / 2 + options.textMargin; |
|
26
|
|
|
|
|
27
|
|
|
// Adds a last character to the end of the barcode |
|
28
|
|
|
this.lastChar = options.lastChar; |
|
29
|
|
|
} |
|
30
|
|
|
|
|
31
|
|
|
valid(){ |
|
32
|
|
|
return this.data.search(/^[0-9]{13}$/) !== -1 && |
|
33
|
|
|
this.data[12] == checksum(this.data); |
|
34
|
|
|
} |
|
35
|
|
|
|
|
36
|
|
|
encode(){ |
|
37
|
|
|
if(this.options.flat){ |
|
38
|
|
|
return this.flatEncoding(); |
|
39
|
|
|
} |
|
40
|
|
|
else{ |
|
41
|
|
|
return this.guardedEncoding(); |
|
42
|
|
|
} |
|
43
|
|
|
} |
|
44
|
|
|
|
|
45
|
|
|
// Define the EAN-13 structure |
|
46
|
|
|
getStructure(){ |
|
47
|
|
|
return [ |
|
48
|
|
|
"LLLLLL", |
|
49
|
|
|
"LLGLGG", |
|
50
|
|
|
"LLGGLG", |
|
51
|
|
|
"LLGGGL", |
|
52
|
|
|
"LGLLGG", |
|
53
|
|
|
"LGGLLG", |
|
54
|
|
|
"LGGGLL", |
|
55
|
|
|
"LGLGLG", |
|
56
|
|
|
"LGLGGL", |
|
57
|
|
|
"LGGLGL" |
|
58
|
|
|
]; |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
|
|
// The "standard" way of printing EAN13 barcodes with guard bars |
|
62
|
|
|
guardedEncoding(){ |
|
63
|
|
|
var encoder = new EANencoder(); |
|
64
|
|
|
var result = []; |
|
65
|
|
|
|
|
66
|
|
|
var structure = this.getStructure()[this.data[0]]; |
|
67
|
|
|
|
|
68
|
|
|
// Get the string to be encoded on the left side of the EAN code |
|
69
|
|
|
var leftSide = this.data.substr(1, 6); |
|
70
|
|
|
|
|
71
|
|
|
// Get the string to be encoded on the right side of the EAN code |
|
72
|
|
|
var rightSide = this.data.substr(7, 6); |
|
73
|
|
|
|
|
74
|
|
|
// Add the first digigt |
|
75
|
|
|
if(this.options.displayValue){ |
|
76
|
|
|
result.push({ |
|
77
|
|
|
data: "000000000000", |
|
78
|
|
|
text: this.text.substr(0, 1), |
|
79
|
|
|
options: {textAlign: "left", fontSize: this.fontSize} |
|
80
|
|
|
}); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
|
|
// Add the guard bars |
|
84
|
|
|
result.push({ |
|
85
|
|
|
data: "101", |
|
86
|
|
|
options: {height: this.guardHeight} |
|
87
|
|
|
}); |
|
88
|
|
|
|
|
89
|
|
|
// Add the left side |
|
90
|
|
|
result.push({ |
|
91
|
|
|
data: encoder.encode(leftSide, structure), |
|
92
|
|
|
text: this.text.substr(1, 6), |
|
93
|
|
|
options: {fontSize: this.fontSize} |
|
94
|
|
|
}); |
|
95
|
|
|
|
|
96
|
|
|
// Add the middle bits |
|
97
|
|
|
result.push({ |
|
98
|
|
|
data: "01010", |
|
99
|
|
|
options: {height: this.guardHeight} |
|
100
|
|
|
}); |
|
101
|
|
|
|
|
102
|
|
|
// Add the right side |
|
103
|
|
|
result.push({ |
|
104
|
|
|
data: encoder.encode(rightSide, "RRRRRR"), |
|
105
|
|
|
text: this.text.substr(7, 6), |
|
106
|
|
|
options: {fontSize: this.fontSize} |
|
107
|
|
|
}); |
|
108
|
|
|
|
|
109
|
|
|
// Add the end bits |
|
110
|
|
|
result.push({ |
|
111
|
|
|
data: "101", |
|
112
|
|
|
options: {height: this.guardHeight} |
|
113
|
|
|
}); |
|
114
|
|
|
|
|
115
|
|
|
if(this.options.lastChar && this.options.displayValue){ |
|
116
|
|
|
result.push({data: "00"}); |
|
117
|
|
|
|
|
118
|
|
|
result.push({ |
|
119
|
|
|
data: "00000", |
|
120
|
|
|
text: this.options.lastChar, |
|
121
|
|
|
options: {fontSize: this.fontSize} |
|
122
|
|
|
}); |
|
123
|
|
|
} |
|
124
|
|
|
return result; |
|
125
|
|
|
} |
|
126
|
|
|
|
|
127
|
|
|
flatEncoding(){ |
|
128
|
|
|
var encoder = new EANencoder(); |
|
129
|
|
|
var result = ""; |
|
130
|
|
|
|
|
131
|
|
|
var structure = this.getStructure()[this.data[0]]; |
|
132
|
|
|
|
|
133
|
|
|
result += "101"; |
|
134
|
|
|
result += encoder.encode(this.data.substr(1, 6), structure); |
|
135
|
|
|
result += "01010"; |
|
136
|
|
|
result += encoder.encode(this.data.substr(7, 6), "RRRRRR"); |
|
137
|
|
|
result += "101"; |
|
138
|
|
|
|
|
139
|
|
|
return { |
|
140
|
|
|
data: result, |
|
141
|
|
|
text: this.text |
|
142
|
|
|
}; |
|
143
|
|
|
} |
|
144
|
|
|
} |
|
145
|
|
|
|
|
146
|
|
|
// Calulate the checksum digit |
|
147
|
|
|
// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit |
|
148
|
|
|
function checksum(number){ |
|
149
|
|
|
var result = 0; |
|
150
|
|
|
|
|
151
|
|
|
var i; |
|
152
|
|
|
for(i = 0; i < 12; i += 2){ |
|
153
|
|
|
result += parseInt(number[i]); |
|
154
|
|
|
} |
|
155
|
|
|
for(i = 1; i < 12; i += 2){ |
|
156
|
|
|
result += parseInt(number[i]) * 3; |
|
157
|
|
|
} |
|
158
|
|
|
|
|
159
|
|
|
return (10 - (result % 10)) % 10; |
|
160
|
|
|
} |
|
161
|
|
|
|
|
162
|
|
|
export default EAN13; |
|
163
|
|
|
|
lindell /
JsBarcode
