Function clone

ServerEditorWeb/ace/worker-css.js:5709–5766

(parent, circular, depth, prototype)

  module.exports = clone;

function clone(parent, circular, depth, prototype) {
  var allParents = [];
  var allChildren = [];

  var useBuffer = typeof Buffer != 'undefined';

  if (typeof circular == 'undefined')
    circular = true;

  if (typeof depth == 'undefined')
    depth = Infinity;
  function _clone(parent, depth) {
    if (parent === null)
      return null;

    if (depth == 0)
      return parent;

    var child;
    if (typeof parent != 'object') {
      return parent;
    }

    if (util.isArray(parent)) {
      child = [];
    } else if (util.isRegExp(parent)) {
      child = new RegExp(parent.source, util.getRegExpFlags(parent));
      if (parent.lastIndex) child.lastIndex = parent.lastIndex;
    } else if (util.isDate(parent)) {
      child = new Date(parent.getTime());
    } else if (useBuffer && Buffer.isBuffer(parent)) {
      child = new Buffer(parent.length);
      parent.copy(child);
      return child;
    } else {
      if (typeof prototype == 'undefined') child = Object.create(Object.getPrototypeOf(parent));
      else child = Object.create(prototype);
    }

    if (circular) {
      var index = allParents.indexOf(parent);

      if (index != -1) {
        return allChildren[index];
      }
      allParents.push(parent);
      allChildren.push(child);
    }

    for (var i in parent) {
      child[i] = _clone(parent[i], depth - 1);
    }

    return child;
  }

  return _clone(parent, depth);
}