@darthmaim/barcode/lib/ean13.js

Verify EAN barcodes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.encode = exports.isValid = exports.checkdigit = void 0;
const helper_1 = require("./helper");
function checkdigit(value) {
    const sum = value.substring(0, 12)
        .split('')
        .map((n) => Number(n))
        .reduce((sum, digit, index) => {
        return sum + (digit * (index % 2 ? 3 : 1));
    });
    return ((10 - (sum % 10)) % 10).toString();
}
exports.checkdigit = checkdigit;
const REGEX = /^[0-9]{13}$/;
function isValid(value) {
    return REGEX.test(value) && checkdigit(value) === value[12];
}
exports.isValid = isValid;
function encode(value) {
    if (!isValid(value)) {
        throw new Error('Invalid EAN13 code');
    }
    const [left, right] = Structure[value[0]];
    const leftValue = value.substring(1, 7);
    const rightValue = value.substring(7, 13);
    const groups = [
        { type: 'quietZone', text: value[0], width: 11 },
        Object.assign({ type: 'marker' }, (0, helper_1.dataWithWidth)('101')),
        Object.assign(Object.assign({ type: 'data' }, (0, helper_1.dataWithWidth)(leftValue.split('').map((digit, index) => helper_1.Encoding[digit][left[index]]).join(''))), { text: leftValue }),
        Object.assign({ type: 'marker' }, (0, helper_1.dataWithWidth)('01010')),
        Object.assign(Object.assign({ type: 'data' }, (0, helper_1.dataWithWidth)(rightValue.split('').map((digit, index) => helper_1.Encoding[digit][right[index]]).join(''))), { text: rightValue }),
        Object.assign({ type: 'marker' }, (0, helper_1.dataWithWidth)('101')),
        { type: 'quietZone', width: 7 }
    ];
    return {
        width: groups.reduce((width, group) => width + group.width, 0),
        groups,
    };
}
exports.encode = encode;
const Structure = {
    '0': ['LLLLLL', 'RRRRRR'],
    '1': ['LLGLGG', 'RRRRRR'],
    '2': ['LLGGLG', 'RRRRRR'],
    '3': ['LLGGGL', 'RRRRRR'],
    '4': ['LGLLGG', 'RRRRRR'],
    '5': ['LGGLLG', 'RRRRRR'],
    '6': ['LGGGLL', 'RRRRRR'],
    '7': ['LGLGLG', 'RRRRRR'],
    '8': ['LGLGGL', 'RRRRRR'],
    '9': ['LGGLGL', 'RRRRRR'],
};
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