fix(parser): Update regex to variations of RMC

Author: lgaticaq

src/index.js

@@ -33,7 +33,7 @@ const verifyChecksum = (data) => {
 /**
  * regex for GPRMC valid data
  */
-const gprmc = /^\$GP(\w{3})\,(\d{6}[.]\d{3})\,([AV])\,(\d{4}[.]\d{4}\,[NS])\,(\d{5}[.]\d{4}\,[WE])\,(\d{1,3}[.]\d{1,3})?\,(\d{1,3}[.]\d{1,3})?\,(\d{6})\,((\d{1,3}[.]\d{1,3})?\,([WE])?)\,?([ADENS])?\*([0-9A-F]{2})$/;
+const gprmc = /^\$GP(\w{3})\,(\d{6}([.]\d+)?)\,([AV])\,(\d{4}([.]\d+)?\,[NS])\,(\d{5}([.]\d+)?\,[WE])\,(\d{1,3}[.]\d{1,3})?\,(\d{1,3}[.]\d{1,3})?\,(\d{6})\,((\d{1,3}[.]\d{1,3})?\,([WE])?)\,?([ADENS])?\*([0-9A-F]{2})$/;
 
 /**
  * regex for GPGGA valid data
@@ -161,28 +161,28 @@ const parseRmc = (raw) => {
   const r = gprmc.exec(raw);
   if (isValid(raw)) {
     data.type = r[1];
-    data.datetime = moment(`${r[8]}${r[2]}+00:00`, 'DDMMYYHHmmss.SSSZZ').toDate();
+    data.datetime = moment(`${r[11]}${r[2]}+00:00`, 'DDMMYYHHmmss.SSSZZ').toDate();
     data.loc = {
       geojson: {
         type: 'Point',
         coordinates: [
-          degToDec(r[5]),
-          degToDec(r[4])
+          degToDec(r[7]),
+          degToDec(r[5])
         ]
       },
       dmm: {
-        latitude: r[4],
-        longitude: r[5]
+        latitude: r[5],
+        longitude: r[7]
       }
     };
-    data.gps = r[3] === 'A';
+    data.gps = r[4] === 'A';
     data.speed = {
-      knots: r[6] ? parseFloat(r[6]) : null,
-      kmh: r[6] ? knotsToKmh(r[6]) : null
+      knots: r[9] ? parseFloat(r[9]) : null,
+      kmh: r[9] ? knotsToKmh(r[9]) : null
     };
-    data.track = r[7] ? r[7] : null;
-    data.magneticVariation = r[9] === ',' ? null : r[9];
-    data.mode = r[12] ? faaModes[r[12]] : null;
+    data.track = r[10] ? r[10] : null;
+    data.magneticVariation = r[12] === ',' ? null : r[12];
+    data.mode = r[15] ? faaModes[r[15]] : null;
     data.valid = true;
   }
   return data;

test/test.js

@@ -54,6 +54,55 @@ describe('Nmea', () => {
     });
   });
 
+  describe('GPRMC alternative', () => {
+    const data = '$GPRMC,192053.00,A,4212.63658,N,00844.30075,W,0.648,295.88,010616,,,A*76';
+    const parser = nmea.parse(data);
+
+    it('should return the same value passed in the constructor', () => {
+      expect(data).to.eql(parser.raw);
+    });
+
+    it('should return true if checksum is valid', () => {
+      expect(nmea.isValid(parser.raw)).to.be.true;
+    });
+
+    it('should return true if datetime values is valid', () => {
+      const datetime = moment.utc(parser.datetime);
+      const date = datetime.format('DDMMYY');
+      expect(date).to.eql('010616');
+      const time = datetime.format('HHmmss');
+      expect(time).to.eql('192053');
+    });
+
+    it('should return true if position values is valid', () => {
+      expect(parser.loc.geojson.type).to.eql('Point');
+      expect(parser.loc.geojson.coordinates.length).to.eql(2);
+      expect(parser.loc.dmm.latitude).to.eql('4212.63658,N');
+      expect(parser.loc.dmm.longitude).to.eql('00844.30075,W');
+    });
+
+    it('should return true if gps value is valid', () => {
+      expect(parser.gps).to.be.true;
+    });
+
+    it('should return true if speed value is valid', () => {
+      expect(parser.speed.knots).to.eql(0.648);
+      expect(parser.speed.kmh).to.eql(1.200096);
+    });
+
+    it('should return true if track value is valid', () => {
+      expect(parser.track).to.eql('295.88');
+    });
+
+    it('should return true if magnetic variation value is valid', () => {
+      expect(parser.magneticVariation).to.be.null;
+    });
+
+    it('should return true if mode value is valid', () => {
+      expect(parser.mode).to.eql('Autonomous');
+    });
+  });
+
   describe('GPGGA', () => {
     const data = '$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,2,6,1.2,18.893,M,-25.669,M,2.0,0031*4F';
     const parser = nmea.parse(data);