add initial version of tab-downloader

songsterr/duration-mapper.test.ts

@@ -0,0 +1,44 @@
+import { test } from 'node:test';
+import * as assert from 'node:assert';
+import * as alphaTab from '@coderline/alphatab';
+import { mapSongsterrDuration } from './duration-mapper.ts';
+import { mapSongsterrInstrumentToPlayback } from './instrument-map.ts';
+
+test('mapSongsterrDuration should map simple and complex durations', () => {
+  // Test a simple quarter note (1/4)
+  const quarter = mapSongsterrDuration([1, 4]);
+  assert.strictEqual(quarter.duration, alphaTab.model.Duration.Quarter);
+  assert.strictEqual(quarter.dots, 0);
+  assert.strictEqual(quarter.isApproximate, false);
+
+  // Test a dotted quarter note (3/8)
+  const dottedQuarter = mapSongsterrDuration([3, 8]);
+  assert.strictEqual(dottedQuarter.duration, alphaTab.model.Duration.Quarter);
+  assert.strictEqual(dottedQuarter.dots, 1);
+  assert.strictEqual(dottedQuarter.isApproximate, false);
+
+  // Test an eighth note (1/8)
+  const eighth = mapSongsterrDuration([1, 8]);
+  assert.strictEqual(eighth.duration, alphaTab.model.Duration.Eighth);
+  assert.strictEqual(eighth.dots, 0);
+
+  // Test a double-dotted quarter note (7/16)
+  // 7/16 = 0.4375 which is a Quarter Note (0.25) + Half-Quarter (0.125) + Quarter-Quarter (0.0625)
+  const doubleDottedQuarter = mapSongsterrDuration([7, 16]);
+  assert.strictEqual(doubleDottedQuarter.duration, alphaTab.model.Duration.Quarter);
+  assert.strictEqual(doubleDottedQuarter.dots, 2);
+  assert.strictEqual(doubleDottedQuarter.isApproximate, false);
+});
+
+test('mapSongsterrInstrumentToPlayback should resolve instruments', () => {
+  // Test standard Songsterr drum identifier
+  const drums = mapSongsterrInstrumentToPlayback(1024);
+  assert.strictEqual(drums.isPercussion, true);
+  assert.strictEqual(drums.program, 0);
+  assert.strictEqual(drums.primaryChannel, 9);
+
+  // Test standard Acoustic Guitar (Program 24)
+  const guitar = mapSongsterrInstrumentToPlayback(24);
+  assert.strictEqual(guitar.isPercussion, false);
+  assert.strictEqual(guitar.program, 24);
+});