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- import Stack from './Stack';
- import arrayEach from './arrayEach';
- import assignValue from './assignValue';
- import baseAssign from './baseAssign';
- import baseForOwn from './baseForOwn';
- import copyArray from './copyArray';
- import copySymbols from './copySymbols';
- import getTag from './getTag';
- import initCloneArray from './initCloneArray';
- import initCloneByTag from './initCloneByTag';
- import initCloneObject from './initCloneObject';
- import isArray from '../isArray';
- import isHostObject from './isHostObject';
- import isObject from '../isObject';
- /** `Object#toString` result references. */
- var argsTag = '[object Arguments]',
- arrayTag = '[object Array]',
- boolTag = '[object Boolean]',
- dateTag = '[object Date]',
- errorTag = '[object Error]',
- funcTag = '[object Function]',
- genTag = '[object GeneratorFunction]',
- mapTag = '[object Map]',
- numberTag = '[object Number]',
- objectTag = '[object Object]',
- regexpTag = '[object RegExp]',
- setTag = '[object Set]',
- stringTag = '[object String]',
- symbolTag = '[object Symbol]',
- weakMapTag = '[object WeakMap]';
- var arrayBufferTag = '[object ArrayBuffer]',
- float32Tag = '[object Float32Array]',
- float64Tag = '[object Float64Array]',
- int8Tag = '[object Int8Array]',
- int16Tag = '[object Int16Array]',
- int32Tag = '[object Int32Array]',
- uint8Tag = '[object Uint8Array]',
- uint8ClampedTag = '[object Uint8ClampedArray]',
- uint16Tag = '[object Uint16Array]',
- uint32Tag = '[object Uint32Array]';
- /** Used to identify `toStringTag` values supported by `_.clone`. */
- var cloneableTags = {};
- cloneableTags[argsTag] = cloneableTags[arrayTag] =
- cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
- cloneableTags[dateTag] = cloneableTags[float32Tag] =
- cloneableTags[float64Tag] = cloneableTags[int8Tag] =
- cloneableTags[int16Tag] = cloneableTags[int32Tag] =
- cloneableTags[mapTag] = cloneableTags[numberTag] =
- cloneableTags[objectTag] = cloneableTags[regexpTag] =
- cloneableTags[setTag] = cloneableTags[stringTag] =
- cloneableTags[symbolTag] = cloneableTags[uint8Tag] =
- cloneableTags[uint8ClampedTag] = cloneableTags[uint16Tag] =
- cloneableTags[uint32Tag] = true;
- cloneableTags[errorTag] = cloneableTags[funcTag] =
- cloneableTags[weakMapTag] = false;
- /**
- * The base implementation of `_.clone` and `_.cloneDeep` which tracks
- * traversed objects.
- *
- * @private
- * @param {*} value The value to clone.
- * @param {boolean} [isDeep] Specify a deep clone.
- * @param {Function} [customizer] The function to customize cloning.
- * @param {string} [key] The key of `value`.
- * @param {Object} [object] The parent object of `value`.
- * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
- * @returns {*} Returns the cloned value.
- */
- function baseClone(value, isDeep, customizer, key, object, stack) {
- var result;
- if (customizer) {
- result = object ? customizer(value, key, object, stack) : customizer(value);
- }
- if (result !== undefined) {
- return result;
- }
- if (!isObject(value)) {
- return value;
- }
- var isArr = isArray(value);
- if (isArr) {
- result = initCloneArray(value);
- if (!isDeep) {
- return copyArray(value, result);
- }
- } else {
- var tag = getTag(value),
- isFunc = tag == funcTag || tag == genTag;
- if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
- if (isHostObject(value)) {
- return object ? value : {};
- }
- result = initCloneObject(isFunc ? {} : value);
- if (!isDeep) {
- return copySymbols(value, baseAssign(result, value));
- }
- } else {
- return cloneableTags[tag]
- ? initCloneByTag(value, tag, isDeep)
- : (object ? value : {});
- }
- }
- // Check for circular references and return its corresponding clone.
- stack || (stack = new Stack);
- var stacked = stack.get(value);
- if (stacked) {
- return stacked;
- }
- stack.set(value, result);
- // Recursively populate clone (susceptible to call stack limits).
- (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
- assignValue(result, key, baseClone(subValue, isDeep, customizer, key, value, stack));
- });
- return isArr ? result : copySymbols(value, result);
- }
- export default baseClone;
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