forked from FOSS/BangleApps
80 lines
2.4 KiB
JavaScript
80 lines
2.4 KiB
JavaScript
// Encoding documentation:
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// https://en.wikipedia.org/wiki/Universal_Product_Code#Encoding
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/*
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* JS source adapted from https://github.com/lindell/JsBarcode
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Johan Lindell (johan@lindell.me)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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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 UPC extends Barcode{
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constructor(data, options){
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// Add checksum if it does not exist
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if(/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(data)){
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data += checksum(data);
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}
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super(data, options);
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}
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valid(){
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return /^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(this.data) &&
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this.data[11] == checksum(this.data);
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}
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encode(){
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var result = "";
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result += "101";
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result += encode(this.data.substr(0, 6), "LLLLLL");
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result += "01010";
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result += encode(this.data.substr(6, 6), "RRRRRR");
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result += "101";
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return {
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data: result,
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text: this.text
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};
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}
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}
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// Calulate the checksum digit
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// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit
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function checksum(number){
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var result = 0;
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var i;
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for(i = 1; i < 11; i += 2){
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result += parseInt(number[i]);
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}
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for(i = 0; i < 11; i += 2){
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result += parseInt(number[i]) * 3;
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}
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return (10 - (result % 10)) % 10;
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}
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module.exports = { UPC, checksum };
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