Function parse

app/rcc/scripts/parser/js/nmea_0183.js:179–214

* Parses an NMEA 0183 sentence into the predefined array structure. * * NMEA sentence structure: * $AACCC,field1,field2,...,fieldN*CS * * $ - Start delimiter * AA - Talker ID (GP=GPS, GL=GLONASS, etc.) * CCC - Sentence formatter (GGA, RMC, etc.) * fields - Comma-separat

(frame)

 * @returns {array} Array of values mapped according to sentenceTypeMap
 */
function parse(frame) {
  frame = frame.trim();

  if (frame.charAt(0) !== '$')
    return parsedValues;

  // Validate checksum when present
  if (frame.indexOf('*') !== -1 && !validateChecksum(frame)) {
    console.error("NMEA checksum validation failed");
    return parsedValues;
  }

  // Strip checksum suffix for field parsing
  var starPos = frame.indexOf('*');
  var dataStr = (starPos !== -1) ? frame.substring(0, starPos) : frame;
  var fields  = dataStr.split(',');

  // Extract sentence type: "$GPGGA,..." → "GPGGA"
  var sentenceId = fields[0].substring(1);

  if (!sentenceTypeMap.hasOwnProperty(sentenceId))
    return parsedValues;

  var config = sentenceTypeMap[sentenceId];

  try {
    var values = config.parser(fields);
    for (var i = 0; i < values.length && i < config.indices.length; i++)
      parsedValues[config.indices[i]] = values[i];
  }
  catch (e) {
    console.error("NMEA parsing error:", e.message);
  }

  return parsedValues;
}