@tonaljs/time-signature/dist/index.mjs

Musical time signatures

// index.ts
var NONE = {
  empty: true,
  name: "",
  upper: void 0,
  lower: void 0,
  type: void 0,
  additive: []
};
var NAMES = ["4/4", "3/4", "2/4", "2/2", "12/8", "9/8", "6/8", "3/8"];
function names() {
  return NAMES.slice();
}
var REGEX = /^(\d*\d(?:\+\d)*)\/(\d+)$/;
var CACHE = /* @__PURE__ */ new Map();
function get(literal) {
  const stringifiedLiteral = JSON.stringify(literal);
  const cached = CACHE.get(stringifiedLiteral);
  if (cached) {
    return cached;
  }
  const ts = build(parse(literal));
  CACHE.set(stringifiedLiteral, ts);
  return ts;
}
function parse(literal) {
  if (typeof literal === "string") {
    const [_, up2, low] = REGEX.exec(literal) || [];
    return parse([up2, low]);
  }
  const [up, down] = literal;
  const denominator = +down;
  if (typeof up === "number") {
    return [up, denominator];
  }
  const list = up.split("+").map((n) => +n);
  return list.length === 1 ? [list[0], denominator] : [list, denominator];
}
var time_signature_default = { names, parse, get };
var isPowerOfTwo = (x) => Math.log(x) / Math.log(2) % 1 === 0;
function build([up, down]) {
  const upper = Array.isArray(up) ? up.reduce((a, b) => a + b, 0) : up;
  const lower = down;
  if (upper === 0 || lower === 0) {
    return NONE;
  }
  const name = Array.isArray(up) ? `${up.join("+")}/${down}` : `${up}/${down}`;
  const additive = Array.isArray(up) ? up : [];
  const type = lower === 4 || lower === 2 ? "simple" : lower === 8 && upper % 3 === 0 ? "compound" : isPowerOfTwo(lower) ? "irregular" : "irrational";
  return {
    empty: false,
    name,
    type,
    upper,
    lower,
    additive
  };
}
export {
  time_signature_default as default,
  get,
  names,
  parse
};
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