@tonaljs/abc-notation/dist/index.mjs

Parse musical notes in abc notation

// index.ts
import { distance as dist, transpose as tr } from "@tonaljs/pitch-distance";
import { note } from "@tonaljs/pitch-note";
var fillStr = (character, times) => Array(times + 1).join(character);
var REGEX = /^(_{1,}|=|\^{1,}|)([abcdefgABCDEFG])([,']*)$/;
function tokenize(str) {
  const m = REGEX.exec(str);
  if (!m) {
    return ["", "", ""];
  }
  return [m[1], m[2], m[3]];
}
function abcToScientificNotation(str) {
  const [acc, letter, oct] = tokenize(str);
  if (letter === "") {
    return "";
  }
  let o = 4;
  for (let i = 0; i < oct.length; i++) {
    o += oct.charAt(i) === "," ? -1 : 1;
  }
  const a = acc[0] === "_" ? acc.replace(/_/g, "b") : acc[0] === "^" ? acc.replace(/\^/g, "#") : "";
  return letter.charCodeAt(0) > 96 ? letter.toUpperCase() + a + (o + 1) : letter + a + o;
}
function scientificToAbcNotation(str) {
  const n = note(str);
  if (n.empty || !n.oct && n.oct !== 0) {
    return "";
  }
  const { letter, acc, oct } = n;
  const a = acc[0] === "b" ? acc.replace(/b/g, "_") : acc.replace(/#/g, "^");
  const l = oct > 4 ? letter.toLowerCase() : letter;
  const o = oct === 5 ? "" : oct > 4 ? fillStr("'", oct - 5) : fillStr(",", 4 - oct);
  return a + l + o;
}
function transpose(note2, interval) {
  return scientificToAbcNotation(tr(abcToScientificNotation(note2), interval));
}
function distance(from, to) {
  return dist(abcToScientificNotation(from), abcToScientificNotation(to));
}
var abc_notation_default = {
  abcToScientificNotation,
  scientificToAbcNotation,
  tokenize,
  transpose,
  distance
};
export {
  abcToScientificNotation,
  abc_notation_default as default,
  distance,
  scientificToAbcNotation,
  tokenize,
  transpose
};
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