1 var Stack = require('./_Stack'),
2 arrayEach = require('./_arrayEach'),
3 assignValue = require('./_assignValue'),
4 baseAssign = require('./_baseAssign'),
5 cloneBuffer = require('./_cloneBuffer'),
6 copyArray = require('./_copyArray'),
7 copySymbols = require('./_copySymbols'),
8 getAllKeys = require('./_getAllKeys'),
9 getTag = require('./_getTag'),
10 initCloneArray = require('./_initCloneArray'),
11 initCloneByTag = require('./_initCloneByTag'),
12 initCloneObject = require('./_initCloneObject'),
13 isArray = require('./isArray'),
14 isBuffer = require('./isBuffer'),
15 isObject = require('./isObject'),
16 keys = require('./keys');
18 /** `Object#toString` result references. */
19 var argsTag = '[object Arguments]',
20 arrayTag = '[object Array]',
21 boolTag = '[object Boolean]',
22 dateTag = '[object Date]',
23 errorTag = '[object Error]',
24 funcTag = '[object Function]',
25 genTag = '[object GeneratorFunction]',
26 mapTag = '[object Map]',
27 numberTag = '[object Number]',
28 objectTag = '[object Object]',
29 regexpTag = '[object RegExp]',
30 setTag = '[object Set]',
31 stringTag = '[object String]',
32 symbolTag = '[object Symbol]',
33 weakMapTag = '[object WeakMap]';
35 var arrayBufferTag = '[object ArrayBuffer]',
36 dataViewTag = '[object DataView]',
37 float32Tag = '[object Float32Array]',
38 float64Tag = '[object Float64Array]',
39 int8Tag = '[object Int8Array]',
40 int16Tag = '[object Int16Array]',
41 int32Tag = '[object Int32Array]',
42 uint8Tag = '[object Uint8Array]',
43 uint8ClampedTag = '[object Uint8ClampedArray]',
44 uint16Tag = '[object Uint16Array]',
45 uint32Tag = '[object Uint32Array]';
47 /** Used to identify `toStringTag` values supported by `_.clone`. */
48 var cloneableTags = {};
49 cloneableTags[argsTag] = cloneableTags[arrayTag] =
50 cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
51 cloneableTags[boolTag] = cloneableTags[dateTag] =
52 cloneableTags[float32Tag] = cloneableTags[float64Tag] =
53 cloneableTags[int8Tag] = cloneableTags[int16Tag] =
54 cloneableTags[int32Tag] = cloneableTags[mapTag] =
55 cloneableTags[numberTag] = cloneableTags[objectTag] =
56 cloneableTags[regexpTag] = cloneableTags[setTag] =
57 cloneableTags[stringTag] = cloneableTags[symbolTag] =
58 cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
59 cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
60 cloneableTags[errorTag] = cloneableTags[funcTag] =
61 cloneableTags[weakMapTag] = false;
64 * The base implementation of `_.clone` and `_.cloneDeep` which tracks
68 * @param {*} value The value to clone.
69 * @param {boolean} [isDeep] Specify a deep clone.
70 * @param {boolean} [isFull] Specify a clone including symbols.
71 * @param {Function} [customizer] The function to customize cloning.
72 * @param {string} [key] The key of `value`.
73 * @param {Object} [object] The parent object of `value`.
74 * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
75 * @returns {*} Returns the cloned value.
77 function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
80 result = object ? customizer(value, key, object, stack) : customizer(value);
82 if (result !== undefined) {
85 if (!isObject(value)) {
88 var isArr = isArray(value);
90 result = initCloneArray(value);
92 return copyArray(value, result);
95 var tag = getTag(value),
96 isFunc = tag == funcTag || tag == genTag;
98 if (isBuffer(value)) {
99 return cloneBuffer(value, isDeep);
101 if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
102 result = initCloneObject(isFunc ? {} : value);
104 return copySymbols(value, baseAssign(result, value));
107 if (!cloneableTags[tag]) {
108 return object ? value : {};
110 result = initCloneByTag(value, tag, baseClone, isDeep);
113 // Check for circular references and return its corresponding clone.
114 stack || (stack = new Stack);
115 var stacked = stack.get(value);
119 stack.set(value, result);
121 var props = isArr ? undefined : (isFull ? getAllKeys : keys)(value);
122 arrayEach(props || value, function(subValue, key) {
125 subValue = value[key];
127 // Recursively populate clone (susceptible to call stack limits).
128 assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
133 module.exports = baseClone;