puzzlelab/textTuneConverters.js at main · Command-Tech/puzzlelab · GitHub

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export const tones = {
  "B0": 31,
  "C1": 33,
  "C#1": 35,
  "D1": 37,
  "D#1": 39,
  "E1": 41,
  "F1": 44,
  "F#1": 46,
  "G1": 49,
  "G#1": 52,
  "A1": 55,
  "A#1": 58,
  "B1": 62,
  "C2": 65,
  "C#2": 69,
  "D2": 73,
  "D#2": 78,
  "E2": 82,
  "F2": 87,
  "F#2": 93,
  "G2": 98,
  "G#2": 104,
  "A2": 110,
  "A#2": 117,
  "B2": 123,
  "C3": 131,
  "C#3": 139,
  "D3": 147,
  "D#3": 156,
  "E3": 165,
  "F3": 175,
  "F#3": 185,
  "G3": 196,
  "G#3": 208,
  "A3": 220,
  "A#3": 233,
  "B3": 247,
  "C4": 262,
  "C#4": 277,
  "D4": 294,
  "D#4": 311,
  "E4": 330,
  "F4": 349,
  "F#4": 370,
  "G4": 392,
  "G#4": 415,
  "A4": 440,
  "A#4": 466,
  "B4": 494,
  "C5": 523,
  "C#5": 554,
  "D5": 587,
  "D#5": 622,
  "E5": 659,
  "F5": 698,
  "F#5": 740,
  "G5": 784,
  "G#5": 831,
  "A5": 880,
  "A#5": 932,
  "B5": 988,
  "C6": 1047,
  "C#6": 1109,
  "D6": 1175,
  "D#6": 1245,
  "E6": 1319,
  "F6": 1397,
  "F#6": 1480,
  "G6": 1568,
  "G#6": 1661,
  "A6": 1760,
  "A#6": 1865,
  "B6": 1976,
  "C7": 2093,
  "C#7": 2217,
  "D7": 2349,
  "D#7": 2489,
  "E7": 2637,
  "F7": 2794,
  "F#7": 2960,
  "G7": 3136,
  "G#7": 3322,
  "A7": 3520,
  "A#7": 3729,
  "B7": 3951,
  "C8": 4186,
  "C#8": 4435,
  "D8": 4699,
  "D#8": 4978
};

const instrumentKey = {
  '~': 'sine',
  '-': 'square',
  '^': 'triangle',
  '/': 'sawtooth',
};

const reverseInstrumentKey = Object.fromEntries(Object.entries(instrumentKey).map(([k, v]) => [v, k]));

export function textToTune(text) {
  const elements = text.replace(/\s/g, '').split(',');
  const tune = [];

  for (const element of elements) {
    if (!element) continue;
    const [durationRaw, notesRaw] = element.split(':');
    const duration = Math.round(parseInt(durationRaw));
    const notes = (notesRaw || '').split('+').map((noteRaw) => {
      if (!noteRaw) return [];
      const [, pitchRaw, instrumentRaw, durationRaw] = noteRaw.match(/^(.+)([~\-^\/])(.+)$/);
      return [
        instrumentKey[instrumentRaw],
        isNaN(parseInt(pitchRaw, 10)) ? pitchRaw : parseInt(pitchRaw, 10),
        parseInt(durationRaw, 10)
      ];
    });
    tune.push([duration, ...notes].flat());
  }

  return tune;
}

export function tuneToText(tune) {
  const groupNotes = (notes) => {
    const groups = [];
    for (let i = 0; i < notes.length; i++) {
      if (i % 3 === 0) {
        groups.push([notes[i]]);
      } else {
        groups[groups.length-1].push(notes[i]);
      }
    }
    return groups;
  }

  const notesToString = ([duration, ...notes]) => (
    notes.length === 0
      ? duration
      : `${duration}: ${groupNotes(notes).map(notesToStringHelper).join(' + ')}`
  )

  const notesToStringHelper = ([instrument, duration, note]) => (
      `${duration}${reverseInstrumentKey[instrument]}${note}`
    )

  return tune.map(notesToString).join(',\n');
}