forked from FOSS/BangleApps
31 lines
678 B
JavaScript
31 lines
678 B
JavaScript
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// Encoding documentation:
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// https://en.wikipedia.org/wiki/EAN_2#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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class EAN2 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]{2}$/) !== -1;
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}
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encode(){
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// Choose the structure based on the number mod 4
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const structure = constants.EAN2_STRUCTURE[parseInt(this.data) % 4];
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return {
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// Start bits + Encode the two digits with 01 in between
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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 = EAN2;
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