Class MinimalEncoder

src/core/datamatrix/encoder/MinimalEncoder.ts:53–513

];

export class MinimalEncoder {
  static isExtendedASCII(ch: char, fnc1: number): boolean {
    return ch !== fnc1 && ch >= 128 && ch <= 255;
  }

  static isInC40Shift1Set(ch: char): boolean {
    return ch <= 31;
  }

  static isInC40Shift2Set(ch: char, fnc1: number): boolean {
    for (const c40Shift2Char of C40_SHIFT2_CHARS) {
      if (c40Shift2Char.charCodeAt(0) === ch) {
        return true;
      }
    }
    return ch === fnc1;
  }

  static isInTextShift1Set(ch: char): boolean {
    return this.isInC40Shift1Set(ch);
  }

  static isInTextShift2Set(ch: char, fnc1: number): boolean {
    return this.isInC40Shift2Set(ch, fnc1);
  }

  /**
   * Performs message encoding of a DataMatrix message
   *
   * @param msg the message
   * @param priorityCharset The preferred {@link Charset}. When the value of the argument is null, the algorithm
   *   chooses charsets that leads to a minimal representation. Otherwise the algorithm will use the priority
   *   charset to encode any character in the input that can be encoded by it if the charset is among the
   *   supported charsets.
   * @param fnc1 denotes the character in the input that represents the FNC1 character or -1 if this is not a GS1
   *   bar code. If the value is not -1 then a FNC1 is also prepended.
   * @param shape requested shape.
   * @return the encoded message (the char values range from 0 to 255)
   */
  static encodeHighLevel(
    msg: string,
    priorityCharset: Charset = null,
    fnc1 = -1,
    shape = SymbolShapeHint.FORCE_NONE
  ): string {
    let macroId = 0;
    if (msg.startsWith(MACRO_05_HEADER) && msg.endsWith(MACRO_TRAILER)) {
      macroId = 5;
      msg = msg.substring(MACRO_05_HEADER.length, msg.length - 2);
    } else if (msg.startsWith(MACRO_06_HEADER) && msg.endsWith(MACRO_TRAILER)) {
      macroId = 6;
      msg = msg.substring(MACRO_06_HEADER.length, msg.length - 2);
    }
    return decodeURIComponent(
      escape(
        String.fromCharCode(
          ...this.encode(msg, priorityCharset, fnc1, shape, macroId)
        )