LAD / LOD extensions for B records

example :
  I013637LAD
  B1526594446200N00547906EA013770137247

Author: spasutto

index.ts

@@ -21,6 +21,7 @@ const RE_K = /^K(\d{2})(\d{2})(\d{2})/;
 const RE_IJ = /^[IJ](\d{2})(?:\d{2}\d{2}[A-Z]{3})+/;
 const RE_TASK = /^C(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})(\d{4})([-\d]{2})(.*)/;
 const RE_TASKPOINT = /^C(\d{2})(\d{2})(\d{3})([NS])(\d{3})(\d{2})(\d{3})([EW])(.*)/;
+const RE_INT = /^\d*$/;
 /* tslint:enable:max-line-length */
 
 const VALID_DATA_SOURCES = ['F', 'O', 'P'];
@@ -430,24 +431,26 @@ class IGCParser {
       throw new Error(`Invalid B record at line ${this.lineNumber}: ${line}`);
     }
 
+    let extensions: IGCParser.RecordExtensions = {};
+    if (this.fixExtensions) {
+      for (let { code, start, length } of this.fixExtensions) {
+        extensions[code] = line.slice(start, start + length);
+      }
+    }
+
     let time = `${match[1]}:${match[2]}:${match[3]}`;
     let timestamp = this.calcTimestamp(time);
 
-    let latitude = IGCParser.parseLatitude(match[4], match[5], match[6], match[7]);
-    let longitude = IGCParser.parseLongitude(match[8], match[9], match[10], match[11]);
+    let mmmext = (RE_INT.test(extensions['LAD'])) ? extensions['LAD'] : '';
+    let latitude = IGCParser.parseLatitude(match[4], match[5], match[6] + mmmext, match[7]);
+    mmmext = (RE_INT.test(extensions['LOD'])) ? extensions['LOD'] : '';
+    let longitude = IGCParser.parseLongitude(match[8], match[9], match[10] + mmmext, match[11]);
 
     let valid = match[12] === 'A';
 
     let pressureAltitude = match[13] === '00000' ? null : parseInt(match[13], 10);
     let gpsAltitude = match[14] === '00000' ? null : parseInt(match[14], 10);
 
-    let extensions: IGCParser.RecordExtensions = {};
-    if (this.fixExtensions) {
-      for (let { code, start, length } of this.fixExtensions) {
-        extensions[code] = line.slice(start, start + length);
-      }
-    }
-
     let enl = null;
     if (extensions['ENL']) {
       let enlLength = this.fixExtensions.filter(it => it.code === 'ENL')[0].length;

test.ts

@@ -112,6 +112,18 @@ describe('IGCParser', () => {
       expect(result.errors).toMatchSnapshot();
     });
 
+    test('lad_lod_extensions.igc', () => {
+      let content = fs.readFileSync(`${__dirname}/fixtures/lad_lod_extensions.igc`, 'utf8');
+      let result = IGCParser.parse(content, { lenient: true });
+
+      expect(result.fixes.length).toEqual(424);
+
+      expect(result.fixes[0].latitude).toEqual(44.968046666666666);
+      expect(result.fixes[0].longitude).toEqual(5.833138333333333);
+
+      expect(result.errors).toMatchSnapshot();
+    });
+
     it('throws if HFDTE is missing', () => {
       let lines = [
         'ALXV6M7FLIGHT:1',
@@ -354,6 +366,11 @@ describe('IGCParser', () => {
       { code: 'ACZ', start: 63, length: 4 },
     ]);
 
+    test.pass('I023636LAD3737LOD', [
+      { code: 'LAD', start: 35, length: 1 },
+      { code: 'LOD', start: 36, length: 1 },
+    ]);
+
     test.fail('');
     test.fail('I023638FXA');
     test.fail('I0136FXA38');