render method

void render(StringBuffer buffer)

Renders this header into a the buffer wrapping it if necessary.

Implementation

void render(StringBuffer buffer) {
  final value = this.value;
  var length = name.length + ': '.length + (value?.length ?? 0);
  buffer
    ..write(name)
    ..write(': ');
  if (length < MailConventions.textLineMaxLength) {
    if (value != null) {
      buffer.write(value);
    }
    buffer.write('\r\n');
  } else {
    var currentLineLength = name.length + ': '.length;
    length -= name.length + ': '.length;
    final runes = value!.runes.toList();
    var startIndex = 0;
    while (length > 0) {
      var chunkLength = MailConventions.textLineMaxLength - currentLineLength;
      if (startIndex + chunkLength >= value.length) {
        // write reminder:
        buffer
          ..write(value.substring(startIndex).trim())
          ..write('\r\n');
        break;
      }
      for (var runeIndex = startIndex + chunkLength;
          runeIndex > startIndex;
          runeIndex--) {
        final rune = runes[runeIndex];
        if (rune == AsciiRunes.runeSemicolon ||
            rune == AsciiRunes.runeSpace ||
            rune == AsciiRunes.runeClosingParentheses ||
            rune == AsciiRunes.runeClosingBracket ||
            rune == AsciiRunes.runeGreaterThan) {
          chunkLength = runeIndex - startIndex + 1;
          break;
        }
      }
      buffer
        ..write(value.substring(startIndex, startIndex + chunkLength).trim())
        ..write('\r\n');
      length -= chunkLength;
      startIndex += chunkLength;
      if (length > 0) {
        buffer.writeCharCode(AsciiRunes.runeTab);
        currentLineLength = 1;
      }
    }
  }
}