cmpstr/dist/esm/utils/DeepMerge.mjs

CmpStr is a lightweight, fast and well performing package for calculating string similarity

// CmpStr v3.2.2 build-bb61120-260311 by Paul Köhler @komed3 / MIT License
import { CmpStrUsageError } from './Errors.mjs';

const BRACKET_PATTERN = /\[(\d+)]/g;
const PATH_CACHE = new Map();
function parse(p) {
  let cached = PATH_CACHE.get(p);
  if (cached) return cached;
  const parsed = p
    .replace(BRACKET_PATTERN, '.$1')
    .split('.')
    .map((s) => {
      const n = Number(s);
      return Number.isInteger(n) && String(n) === s ? n : s;
    });
  PATH_CACHE.set(p, parsed);
  return parsed;
}
function get(t, path, fb) {
  let o = t;
  for (const k of parse(path)) {
    if (o == null || !(k in o)) return fb;
    o = o[k];
  }
  return o;
}
function has(t, path) {
  let o = t;
  for (const k of parse(path)) {
    if (o == null || !(k in o)) return false;
    o = o[k];
  }
  return true;
}
function set(t, path, value) {
  if (path === '') return value;
  const keys = parse(path);
  if (t !== undefined && (typeof t !== 'object' || t === null))
    throw new CmpStrUsageError(
      `Cannot set property <${keys[0]}> of <${JSON.stringify(t)}>`,
      { path: keys[0], target: t }
    );
  const root = t ?? (typeof keys[0] === 'number' ? [] : Object.create(null));
  let cur = root;
  for (let i = 0; i < keys.length - 1; i++) {
    const k = keys[i];
    let n = cur[k];
    if (n != null && typeof n !== 'object')
      throw new CmpStrUsageError(
        `Cannot set property <${keys[i + 1]}> of <${JSON.stringify(n)}>`,
        { path: keys.slice(0, i + 2), value: n }
      );
    if (n == null)
      n = cur[k] = typeof keys[i + 1] === 'number' ? [] : Object.create(null);
    cur = n;
  }
  cur[keys[keys.length - 1]] = value;
  return root;
}
function merge(
  t = Object.create(null),
  o = Object.create(null),
  mergeUndefined = false
) {
  const target = t ?? Object.create(null);
  Object.keys(o).forEach((k) => {
    const val = o[k];
    if (!mergeUndefined && val === undefined) return;
    if (k === '__proto__' || k === 'constructor') return;
    if (val !== null && typeof val === 'object' && !Array.isArray(val)) {
      const existing = target[k];
      target[k] = merge(
        existing !== null &&
          typeof existing === 'object' &&
          !Array.isArray(existing)
          ? existing
          : Object.create(null),
        val,
        mergeUndefined
      );
    } else target[k] = val;
  });
  return target;
}
function rmv(t, path, preserveEmpty = false) {
  const keys = parse(path);
  const remove = (obj, i = 0) => {
    const key = keys[i];
    if (!obj || typeof obj !== 'object') return false;
    if (i === keys.length - 1) return delete obj[key];
    if (!remove(obj[key], i + 1)) return false;
    if (!preserveEmpty) {
      const val = obj[key];
      if (
        typeof val === 'object' &&
        ((Array.isArray(val) && val.every((v) => v == null)) ||
          (!Array.isArray(val) && Object.keys(val).length === 0))
      )
        delete obj[key];
    }
    return true;
  };
  remove(t);
  return t;
}

export { get, has, merge, rmv, set };