@hamset/maidenhead-locator/dist/index.js

Maidenhead grid locator and WGS84 coordinate calculation and transformation

const a = (n) => String.fromCharCode(65 + n), r = (n) => {
  if (n.length !== 1 || !/[A-Za-z]/.test(n))
    throw new Error("invalid char input.");
  return n.toUpperCase().charCodeAt(0) - 65;
}, d = (n) => typeof n != "string" || n.length % 2 !== 0 ? !1 : /^[A-R]{2}[0-9]{2}[A-Xa-x]{2}$/.test(n), u = (n) => {
  if (typeof n != "object" && !Array.isArray(n))
    throw new Error("invalid coord. it should be [number, number] or {lat: number, lng: number}");
  const { lat: e, lng: t } = Array.isArray(n) ? { lat: n[0], lng: n[1] } : n;
  if (e < -90 || e > 90)
    throw new Error("invalid lat. it should be between -90 and 90");
  if (t < -180 || t > 180)
    throw new Error("invalid lng. it should be between -180 and 180");
  const l = Math.floor((e + 90) / 10), o = Math.floor((t + 180) / 20), s = Math.floor(e + 90) % 10, h = Math.floor(Math.floor(t + 180) % 20 / 2), i = Math.floor((e - Math.floor(e)) * 60 / 2.5), f = Math.floor((t - Math.floor(t / 2) * 2) * 60 / 5);
  return `${a(o)}${a(l)}${h}${s}${(a(f) + a(i)).toLowerCase()}`;
}, w = (n) => {
  if (!d(n))
    throw new Error("invalid gridLocator");
  const e = r(n[0]), t = r(n[1]), l = parseInt(n[2]), o = parseInt(n[3]), s = r(n[4].toUpperCase()), h = r(n[5].toUpperCase()), i = e * 20 - 180 + l * 2 + s * 5 / 60;
  return { lat: t * 10 - 90 + o + h * 2.5 / 60, lng: i };
}, b = (n) => {
  if (!d(n))
    throw new Error("invalid gridLocator");
  let e = r(n[0]) * 20 + parseInt(n[2]) * 2 + r(n[4]) * 5 / 60 - 180, t = r(n[1]) * 10 + parseInt(n[3]) + r(n[5]) * 2.5 / 60 - 90;
  return [
    [t, e],
    [t + 0.041666666666666664, e + 0.08333333333333333]
  ];
};
export {
  u as WGS84ToMaidenhead,
  b as maidenheadToBoundingBox,
  w as maidenheadToWGS84,
  d as validateGridLocator
};