forked from FOSS/BangleApps
41 lines
760 B
JavaScript
41 lines
760 B
JavaScript
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// Encoding documentation:
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// https://en.wikipedia.org/wiki/EAN_5#Encoding
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const constants = require("cards.constants.js");
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const encode = require("cards.encode.js");
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const Barcode = require("cards.Barcode.js");
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const checksum = (data) => {
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const result = data
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.split('')
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.map(n => +n)
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.reduce((sum, a, idx) => {
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return idx % 2
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? sum + a * 9
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: sum + a * 3;
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}, 0);
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return result % 10;
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};
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class EAN5 extends Barcode {
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constructor(data, options) {
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super(data, options);
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}
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valid() {
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return this.data.search(/^[0-9]{5}$/) !== -1;
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}
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encode() {
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const structure = constants.EAN5_STRUCTURE[checksum(this.data)];
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return {
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data: '1011' + encode(this.data, structure, '01'),
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text: this.text
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};
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}
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}
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module.exports = EAN5;
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