@tonaljs/pitch-note/dist/index.mjs

Parse intervals in shorthand notation

// index.ts
import {
  coordinates,
  isNamedPitch,
  isPitch,
  pitch
} from "@tonaljs/pitch";
var fillStr = (s, n) => Array(Math.abs(n) + 1).join(s);
var NoNote = Object.freeze({
  empty: true,
  name: "",
  letter: "",
  acc: "",
  pc: "",
  step: NaN,
  alt: NaN,
  chroma: NaN,
  height: NaN,
  coord: [],
  midi: null,
  freq: null
});
var cache = /* @__PURE__ */ new Map();
var stepToLetter = (step) => "CDEFGAB".charAt(step);
var altToAcc = (alt) => alt < 0 ? fillStr("b", -alt) : fillStr("#", alt);
var accToAlt = (acc) => acc[0] === "b" ? -acc.length : acc.length;
function note(src) {
  const stringSrc = JSON.stringify(src);
  const cached = cache.get(stringSrc);
  if (cached) {
    return cached;
  }
  const value = typeof src === "string" ? parse(src) : isPitch(src) ? note(pitchName(src)) : isNamedPitch(src) ? note(src.name) : NoNote;
  cache.set(stringSrc, value);
  return value;
}
var REGEX = /^([a-gA-G]?)(#{1,}|b{1,}|x{1,}|)(-?\d*)\s*(.*)$/;
function tokenizeNote(str) {
  const m = REGEX.exec(str);
  return m ? [m[1].toUpperCase(), m[2].replace(/x/g, "##"), m[3], m[4]] : ["", "", "", ""];
}
function coordToNote(noteCoord) {
  return note(pitch(noteCoord));
}
var mod = (n, m) => (n % m + m) % m;
var SEMI = [0, 2, 4, 5, 7, 9, 11];
function parse(noteName) {
  const tokens = tokenizeNote(noteName);
  if (tokens[0] === "" || tokens[3] !== "") {
    return NoNote;
  }
  const letter = tokens[0];
  const acc = tokens[1];
  const octStr = tokens[2];
  const step = (letter.charCodeAt(0) + 3) % 7;
  const alt = accToAlt(acc);
  const oct = octStr.length ? +octStr : void 0;
  const coord = coordinates({ step, alt, oct });
  const name = letter + acc + octStr;
  const pc = letter + acc;
  const chroma = (SEMI[step] + alt + 120) % 12;
  const height = oct === void 0 ? mod(SEMI[step] + alt, 12) - 12 * 99 : SEMI[step] + alt + 12 * (oct + 1);
  const midi = height >= 0 && height <= 127 ? height : null;
  const freq = oct === void 0 ? null : Math.pow(2, (height - 69) / 12) * 440;
  return {
    empty: false,
    acc,
    alt,
    chroma,
    coord,
    freq,
    height,
    letter,
    midi,
    name,
    oct,
    pc,
    step
  };
}
function pitchName(props) {
  const { step, alt, oct } = props;
  const letter = stepToLetter(step);
  if (!letter) {
    return "";
  }
  const pc = letter + altToAcc(alt);
  return oct || oct === 0 ? pc + oct : pc;
}
export {
  accToAlt,
  altToAcc,
  coordToNote,
  note,
  stepToLetter,
  tokenizeNote
};
//# sourceMappingURL=index.mjs.map