lindell / JsBarcode

import Barcode from '../Barcode';

class ITF extends Barcode {

	encode() {

		// Calculate all the digit pairs

		const encoded = this.data

			.match(/.{2}/g)

			.map(pair => this.encodePair(pair))

			.join('');

		return {

			data: START_BIN + encoded + END_BIN,

			text: this.text

		};

	}

	// Calculate the data of a number pair

	encodePair(pair) {

		const second = BINARIES[pair[1]];

		return BINARIES[pair[0]]

			.split('')

			.map((first, idx) => (

				(first === '1' ? '111' : '1') +

				(second[idx] === '1' ? '000' : '0')

			))

			.join('');

	}

}

export default ITF;