minimal scale system

src/Scales.ts

@@ -0,0 +1,67 @@
+const SCALES: Record<string, number[]> = {
+  major: [0, 2, 4, 5, 7, 9, 11],
+  naturalMinor: [0, 2, 3, 5, 7, 8, 10],
+  harmonicMinor: [0, 2, 3, 5, 7, 8, 11],
+  melodicMinor: [0, 2, 3, 5, 7, 9, 11],
+  dorian: [0, 2, 3, 5, 7, 9, 10],
+  phrygian: [0, 1, 3, 5, 7, 8, 10],
+  lydian: [0, 2, 4, 6, 7, 9, 11],
+  mixolydian: [0, 2, 4, 5, 7, 9, 10],
+  aeolian: [0, 2, 3, 5, 7, 8, 10],
+  locrian: [0, 1, 3, 5, 6, 8, 10],
+  wholeTone: [0, 2, 4, 6, 8, 10],
+  majorPentatonic: [0, 2, 4, 7, 9],
+  minorPentatonic: [0, 3, 5, 7, 10],
+  chromatic: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11],
+  blues: [0, 3, 5, 6, 7, 10],
+  diminished: [0, 2, 3, 5, 6, 8, 9, 11],
+  neapolitanMinor: [0, 1, 3, 5, 7, 8, 11],
+  neapolitanMajor: [0, 1, 3, 5, 7, 9, 11],
+  enigmatic: [0, 1, 4, 6, 8, 10, 11],
+  doubleHarmonic: [0, 1, 4, 5, 7, 8, 11],
+  octatonic: [0, 2, 3, 5, 6, 8, 9, 11],
+  bebopDominant: [0, 2, 4, 5, 7, 9, 10, 11],
+  bebopMajor: [0, 2, 4, 5, 7, 8, 9, 11],
+  bebopMinor: [0, 2, 3, 5, 7, 8, 9, 11],
+  bebopDorian: [0, 2, 3, 4, 5, 7, 9, 10],
+  harmonicMajor: [0, 2, 4, 5, 7, 8, 11],
+  hungarianMinor: [0, 2, 3, 6, 7, 8, 11],
+  hungarianMajor: [0, 3, 4, 6, 7, 9, 10],
+  oriental: [0, 1, 4, 5, 6, 9, 10],
+  romanianMinor: [0, 2, 3, 6, 7, 9, 10],
+  spanishGypsy: [0, 1, 4, 5, 7, 8, 10],
+  jewish: [0, 1, 4, 5, 7, 8, 10],
+  hindu: [0, 2, 4, 5, 7, 8, 10],
+  japanese: [0, 1, 5, 7, 8],
+  hirajoshi: [0, 2, 3, 7, 8],
+  kumoi: [0, 2, 3, 7, 9],
+  inSen: [0, 1, 5, 7, 10],
+  iwato: [0, 1, 5, 6, 10],
+  yo: [0, 2, 5, 7, 9],
+  minorBlues: [0, 3, 5, 6, 7, 10],
+  algerian: [0, 2, 3, 5, 6, 7, 8, 11],
+  augmented: [0, 3, 4, 7, 8, 11],
+  balinese: [0, 1, 3, 7, 8],
+  byzantine: [0, 1, 4, 5, 7, 8, 11],
+  chinese: [0, 4, 6, 7, 11],
+  egyptian: [0, 2, 5, 7, 10],
+  eightToneSpanish: [0, 1, 3, 4, 5, 6, 8, 10],
+  hawaiian: [0, 2, 3, 5, 7, 9, 10],
+  hindustan: [0, 2, 4, 5, 7, 8, 10],
+  persian: [0, 1, 4, 5, 6, 8, 11],
+  eastIndianPurvi: [0, 1, 4, 6, 7, 8, 11],
+  orientalA: [0, 1, 4, 5, 6, 9, 10]
+};
+
+export function scale(n: number, scaleName: string = 'major', octave: number = 4): number {
+    const scale = SCALES[scaleName];
+  
+    if (!scale) {
+      throw new Error(`Unknown scale ${scaleName}`);
+    }
+  
+    let index = n % scale.length;
+    if (index < 0) index += scale.length; // adjust for negative indexes
+    let additionalOctaves = Math.floor(n / scale.length);
+    return 60 + (octave + additionalOctaves) * 12 + scale[index];
+  }