| var arrayCopy = require('./arrayCopy'), |
| arrayEach = require('./arrayEach'), |
| baseAssign = require('./baseAssign'), |
| baseForOwn = require('./baseForOwn'), |
| initCloneArray = require('./initCloneArray'), |
| initCloneByTag = require('./initCloneByTag'), |
| initCloneObject = require('./initCloneObject'), |
| isArray = require('../lang/isArray'), |
| isObject = require('../lang/isObject'); |
| |
| /** `Object#toString` result references. */ |
| var argsTag = '[object Arguments]', |
| arrayTag = '[object Array]', |
| boolTag = '[object Boolean]', |
| dateTag = '[object Date]', |
| errorTag = '[object Error]', |
| funcTag = '[object Function]', |
| mapTag = '[object Map]', |
| numberTag = '[object Number]', |
| objectTag = '[object Object]', |
| regexpTag = '[object RegExp]', |
| setTag = '[object Set]', |
| stringTag = '[object String]', |
| 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[numberTag] = cloneableTags[objectTag] = |
| cloneableTags[regexpTag] = cloneableTags[stringTag] = |
| cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] = |
| cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true; |
| cloneableTags[errorTag] = cloneableTags[funcTag] = |
| cloneableTags[mapTag] = cloneableTags[setTag] = |
| cloneableTags[weakMapTag] = false; |
| |
| /** Used for native method references. */ |
| var objectProto = Object.prototype; |
| |
| /** |
| * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring) |
| * of values. |
| */ |
| var objToString = objectProto.toString; |
| |
| /** |
| * The base implementation of `_.clone` without support for argument juggling |
| * and `this` binding `customizer` functions. |
| * |
| * @private |
| * @param {*} value The value to clone. |
| * @param {boolean} [isDeep] Specify a deep clone. |
| * @param {Function} [customizer] The function to customize cloning values. |
| * @param {string} [key] The key of `value`. |
| * @param {Object} [object] The object `value` belongs to. |
| * @param {Array} [stackA=[]] Tracks traversed source objects. |
| * @param {Array} [stackB=[]] Associates clones with source counterparts. |
| * @returns {*} Returns the cloned value. |
| */ |
| function baseClone(value, isDeep, customizer, key, object, stackA, stackB) { |
| var result; |
| if (customizer) { |
| result = object ? customizer(value, key, object) : customizer(value); |
| } |
| if (result !== undefined) { |
| return result; |
| } |
| if (!isObject(value)) { |
| return value; |
| } |
| var isArr = isArray(value); |
| if (isArr) { |
| result = initCloneArray(value); |
| if (!isDeep) { |
| return arrayCopy(value, result); |
| } |
| } else { |
| var tag = objToString.call(value), |
| isFunc = tag == funcTag; |
| |
| if (tag == objectTag || tag == argsTag || (isFunc && !object)) { |
| result = initCloneObject(isFunc ? {} : value); |
| if (!isDeep) { |
| return baseAssign(result, value); |
| } |
| } else { |
| return cloneableTags[tag] |
| ? initCloneByTag(value, tag, isDeep) |
| : (object ? value : {}); |
| } |
| } |
| // Check for circular references and return its corresponding clone. |
| stackA || (stackA = []); |
| stackB || (stackB = []); |
| |
| var length = stackA.length; |
| while (length--) { |
| if (stackA[length] == value) { |
| return stackB[length]; |
| } |
| } |
| // Add the source value to the stack of traversed objects and associate it with its clone. |
| stackA.push(value); |
| stackB.push(result); |
| |
| // Recursively populate clone (susceptible to call stack limits). |
| (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) { |
| result[key] = baseClone(subValue, isDeep, customizer, key, value, stackA, stackB); |
| }); |
| return result; |
| } |
| |
| module.exports = baseClone; |