ean13-lib/dist/Ean13Utils.js

Provides common EAN 13 barcode related features.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class Ean13Utils {
    static validate(numberAsString) {
        if (!Number(numberAsString) || numberAsString.length !== 13) {
            return false;
        }
        const baseNumber = numberAsString.substr(0, 12);
        const checkDigit = Number(numberAsString.charAt(12));
        const expectedCheckDigit = this.calculateCheckDigit(baseNumber);
        return expectedCheckDigit === checkDigit;
    }
    static calculateCheckDigit(baseNumberAsString) {
        if (!Number(baseNumberAsString) || baseNumberAsString.length !== 12) {
            throw Error('Not an EAN 13 base number. Must have s number with at most 12 digits.');
        }
        const digits = [];
        for (let i = 0; i < 12; i++) {
            digits.push(Number(baseNumberAsString.charAt(i)));
        }
        const weightedDigitsSum = digits[0] + digits[1] * 3
            + digits[2] + digits[3] * 3
            + digits[4] + digits[5] * 3
            + digits[6] + digits[7] * 3
            + digits[8] + digits[9] * 3
            + digits[10] + digits[11] * 3;
        const remainder = weightedDigitsSum % 10;
        return remainder === 0 ? 0 : (10 - remainder);
    }
    static generate(baseNumberAsString) {
        const checkDigit = this.calculateCheckDigit(baseNumberAsString);
        return Number(baseNumberAsString) * 10 + checkDigit;
    }
}
exports.Ean13Utils = Ean13Utils;
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