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/*!
 * set-value <https://github.com/jonschlinkert/set-value>
 *
 * Copyright (c) 2014-2015, 2017, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

var split = require('split-string');
var extend = require('extend-shallow');
var isPlainObject = require('is-plain-object');
var isObject = require('is-extendable');

module.exports = function(obj, prop, val) {
  if (!isObject(obj)) {
    return obj;
  }

  if (Array.isArray(prop)) {
    prop = [].concat.apply([], prop).join('.');
  }

  if (typeof prop !== 'string') {
    return obj;
  }

  var keys = split(prop, {sep: '.', brackets: true}).filter(isValidKey);
  var len = keys.length;
  var idx = -1;
  var current = obj;

  while (++idx < len) {
    var key = keys[idx];
    if (idx !== len - 1) {
      if (!isObject(current[key])) {
        current[key] = {};
      }
      current = current[key];
      continue;
    }

    if (isPlainObject(current[key]) && isPlainObject(val)) {
      current[key] = extend({}, current[key], val);
    } else {
      current[key] = val;
    }
  }

  return obj;
};

function isValidKey(key) {
  return key !== '__proto__' && key !== 'constructor' && key !== 'prototype';
}