zxing-js/library

import AI01weightDecoder from './AI01weightDecoder';
import BitArray from '../../../../common/BitArray';
import NotFoundException from '../../../../NotFoundException';
import StringBuilder from '../../../../util/StringBuilder';

export default class AI013x0x1xDecoder extends AI01weightDecoder {
  private static readonly HEADER_SIZE = 7 + 1;
  private static readonly WEIGHT_SIZE = 20;
  private static readonly DATE_SIZE = 16;

  private readonly dateCode: string;
  private readonly firstAIdigits: string;

  constructor(information: BitArray, firstAIdigits: string, dateCode: string) {
    super(information);
    this.dateCode = dateCode;
    this.firstAIdigits = firstAIdigits;
  }

  public parseInformation(): string {
    if (
      this.getInformation().getSize() !==
      AI013x0x1xDecoder.HEADER_SIZE +
        AI013x0x1xDecoder.GTIN_SIZE +
        AI013x0x1xDecoder.WEIGHT_SIZE +
        AI013x0x1xDecoder.DATE_SIZE
    ) {
      throw new NotFoundException();
    }

    let buf = new StringBuilder();

    this.encodeCompressedGtin(buf, AI013x0x1xDecoder.HEADER_SIZE);
    this.encodeCompressedWeight(
      buf,
      AI013x0x1xDecoder.HEADER_SIZE + AI013x0x1xDecoder.GTIN_SIZE,
      AI013x0x1xDecoder.WEIGHT_SIZE
    );
    this.encodeCompressedDate(
      buf,
      AI013x0x1xDecoder.HEADER_SIZE +
        AI013x0x1xDecoder.GTIN_SIZE +
        AI013x0x1xDecoder.WEIGHT_SIZE
    );

    return buf.toString();
  }

  private encodeCompressedDate(buf: StringBuilder, currentPos: number): void {
    let numericDate = this.getGeneralDecoder().extractNumericValueFromBitArray(
      currentPos,
      AI013x0x1xDecoder.DATE_SIZE
    );
    if (numericDate === 38400) {
      return;
    }

    buf.append('(');
    buf.append(this.dateCode);
    buf.append(')');

    let day = numericDate % 32;
    numericDate /= 32;
    let month = (numericDate % 12) + 1;
    numericDate /= 12;
    let year = numericDate;

    if (year / 10 === 0) {
      buf.append('0');
    }
    buf.append(year);
    if (month / 10 === 0) {
      buf.append('0');
    }
    buf.append(month);
    if (day / 10 === 0) {
      buf.append('0');
    }
    buf.append(day);
  }

  protected addWeightCode(buf: StringBuilder, weight: number): void {
    buf.append('(');
    buf.append(this.firstAIdigits);
    buf.append(weight / 100000);
    buf.append(')');
  }

  protected checkWeight(weight: number): number {
    return weight % 100000;
  }
}