1 var assignMergeValue = require('./_assignMergeValue'),
2 cloneBuffer = require('./_cloneBuffer'),
3 cloneTypedArray = require('./_cloneTypedArray'),
4 copyArray = require('./_copyArray'),
5 initCloneObject = require('./_initCloneObject'),
6 isArguments = require('./isArguments'),
7 isArray = require('./isArray'),
8 isArrayLikeObject = require('./isArrayLikeObject'),
9 isBuffer = require('./isBuffer'),
10 isFunction = require('./isFunction'),
11 isObject = require('./isObject'),
12 isPlainObject = require('./isPlainObject'),
13 isTypedArray = require('./isTypedArray'),
14 safeGet = require('./_safeGet'),
15 toPlainObject = require('./toPlainObject');
18 * A specialized version of `baseMerge` for arrays and objects which performs
19 * deep merges and tracks traversed objects enabling objects with circular
20 * references to be merged.
23 * @param {Object} object The destination object.
24 * @param {Object} source The source object.
25 * @param {string} key The key of the value to merge.
26 * @param {number} srcIndex The index of `source`.
27 * @param {Function} mergeFunc The function to merge values.
28 * @param {Function} [customizer] The function to customize assigned values.
29 * @param {Object} [stack] Tracks traversed source values and their merged
32 function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
33 var objValue = safeGet(object, key),
34 srcValue = safeGet(source, key),
35 stacked = stack.get(srcValue);
38 assignMergeValue(object, key, stacked);
41 var newValue = customizer
42 ? customizer(objValue, srcValue, (key + ''), object, source, stack)
45 var isCommon = newValue === undefined;
48 var isArr = isArray(srcValue),
49 isBuff = !isArr && isBuffer(srcValue),
50 isTyped = !isArr && !isBuff && isTypedArray(srcValue);
53 if (isArr || isBuff || isTyped) {
54 if (isArray(objValue)) {
57 else if (isArrayLikeObject(objValue)) {
58 newValue = copyArray(objValue);
62 newValue = cloneBuffer(srcValue, true);
66 newValue = cloneTypedArray(srcValue, true);
72 else if (isPlainObject(srcValue) || isArguments(srcValue)) {
74 if (isArguments(objValue)) {
75 newValue = toPlainObject(objValue);
77 else if (!isObject(objValue) || isFunction(objValue)) {
78 newValue = initCloneObject(srcValue);
86 // Recursively merge objects and arrays (susceptible to call stack limits).
87 stack.set(srcValue, newValue);
88 mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
89 stack['delete'](srcValue);
91 assignMergeValue(object, key, newValue);
94 module.exports = baseMergeDeep;