SegmentedMessage constructor

SegmentedMessage(String message, [ SmsEncodingMode encodingMode = SmsEncodingMode.auto, bool smartEncoding = false ])

Constructor for the SegmentedMessage class.

message : The message content to be segmented and encoded. encodingMode : The desired encoding format (defaults to auto-detection). smartEncoding : Whether to use smart encoding for character replacement.

Implementation

SegmentedMessage(String message,
    [this.encodingMode = SmsEncodingMode.auto, bool smartEncoding = false]) {
  // Apply smart encoding if enabled
  if (smartEncoding) {
    message = message
        .split('')
        .map((char) => smartEncodingMap[char] ?? char)
        .join('');
  }

  // Split message into graphemes and process line breaks
  graphemes = message.characters
      .expand(
          (grapheme) => grapheme == '\r\n' ? grapheme.split('') : [grapheme])
      .toList(growable: false);

  // Count the number of Unicode scalars in the message
  numberOfUnicodeScalars = message.runes.length;

  // Determine the encoding type for the message
  if (encodingMode == SmsEncodingMode.auto) {
    encoding =
        _hasAnyUCSCharacters(graphemes) ? SmsEncoding.ucs2 : SmsEncoding.gsm7;
  } else {
    if (encodingMode == SmsEncodingMode.gsm7 &&
        _hasAnyUCSCharacters(graphemes)) {
      throw Exception(
          'The string provided is incompatible with GSM-7 encoding');
    }
    encoding = switch (encodingMode) {
      SmsEncodingMode.gsm7 => SmsEncoding.gsm7,
      SmsEncodingMode.ucs2 => SmsEncoding.ucs2,
      _ => throw ('Unsupported encoding mode: $encodingMode'),
    };
  }

  // Encode the characters based on the determined encoding
  encodedChars = _encodeChars(graphemes, encoding);

  // Count the number of characters based on encoding
  numberOfCharacters = encoding == SmsEncoding.ucs2
      ? graphemes.length
      : _countCodeUnits(encodedChars);

  // Build segments from encoded characters
  segments = _buildSegments(encodedChars);

  // Detect the line break style in the message
  lineBreakStyle = _detectLineBreakStyle(message);

  // Check for any warnings in the message content
  warnings = _checkForWarnings(lineBreakStyle);
}