1 var assignMergeValue = require('./assignMergeValue'),
2 baseClone = require('./baseClone'),
3 copyArray = require('./copyArray'),
4 isArguments = require('../isArguments'),
5 isArray = require('../isArray'),
6 isArrayLikeObject = require('../isArrayLikeObject'),
7 isFunction = require('../isFunction'),
8 isObject = require('../isObject'),
9 isPlainObject = require('../isPlainObject'),
10 isTypedArray = require('../isTypedArray'),
11 toPlainObject = require('../toPlainObject');
14 * A specialized version of `baseMerge` for arrays and objects which performs
15 * deep merges and tracks traversed objects enabling objects with circular
16 * references to be merged.
19 * @param {Object} object The destination object.
20 * @param {Object} source The source object.
21 * @param {string} key The key of the value to merge.
22 * @param {number} srcIndex The index of `source`.
23 * @param {Function} mergeFunc The function to merge values.
24 * @param {Function} [customizer] The function to customize assigned values.
25 * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
27 function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
28 var objValue = object[key],
29 srcValue = source[key],
30 stacked = stack.get(srcValue) || stack.get(objValue);
33 assignMergeValue(object, key, stacked);
36 var newValue = customizer ? customizer(objValue, srcValue, (key + ''), object, source, stack) : undefined,
37 isCommon = newValue === undefined;
41 if (isArray(srcValue) || isTypedArray(srcValue)) {
42 if (isArray(objValue)) {
43 newValue = srcIndex ? copyArray(objValue) : objValue;
45 else if (isArrayLikeObject(objValue)) {
46 newValue = copyArray(objValue);
49 newValue = baseClone(srcValue);
52 else if (isPlainObject(srcValue) || isArguments(srcValue)) {
53 if (isArguments(objValue)) {
54 newValue = toPlainObject(objValue);
56 else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
57 newValue = baseClone(srcValue);
60 newValue = srcIndex ? baseClone(objValue) : objValue;
67 stack.set(srcValue, newValue);
70 // Recursively merge objects and arrays (susceptible to call stack limits).
71 mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
73 assignMergeValue(object, key, newValue);
76 module.exports = baseMergeDeep;