Class EdifactEncoder

src/core/datamatrix/encoder/EdifactEncoder.ts:8–146

import HighLevelEncoder from './HighLevelEncoder';

export class EdifactEncoder implements Encoder {
  public getEncodingMode() {
    return EDIFACT_ENCODATION;
  }

  public encode(context: EncoderContext) {
    // step F
    const buffer = new StringBuilder();
    while (context.hasMoreCharacters()) {
      const c = context.getCurrentChar();
      this.encodeChar(c, buffer);
      context.pos++;

      const count = buffer.length();
      if (count >= 4) {
        context.writeCodewords(this.encodeToCodewords(buffer.toString()));

        const test = buffer.toString().substring(4);
        buffer.setLengthToZero();
        buffer.append(test);

        // buffer.delete(0, 4);
        // for (let i = 0; i < 4; i++) {
        //  buffer.deleteCharAt(i);
        // }

        const newMode = HighLevelEncoder.lookAheadTest(
          context.getMessage(),
          context.pos,
          this.getEncodingMode()
        );
        if (newMode !== this.getEncodingMode()) {
          // Return to ASCII encodation, which will actually handle latch to new mode
          context.signalEncoderChange(ASCII_ENCODATION);
          break;
        }
      }
    }
    buffer.append(StringUtils.getCharAt(31)); // Unlatch
    this.handleEOD(context, buffer);
  }

  /**
   * Handle "end of data" situations
   *
   * @param context the encoder context
   * @param buffer  the buffer with the remaining encoded characters
   */
  private handleEOD(context: EncoderContext, buffer: StringBuilder) {
    try {
      const count = buffer.length();
      if (count === 0) {
        return; // Already finished
      }
      if (count === 1) {
        // Only an unlatch at the end
        context.updateSymbolInfo();
        let available =