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166 lines
5.5 KiB
166 lines
5.5 KiB
var Stack = require('./_Stack'),
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arrayEach = require('./_arrayEach'),
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assignValue = require('./_assignValue'),
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baseAssign = require('./_baseAssign'),
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baseAssignIn = require('./_baseAssignIn'),
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cloneBuffer = require('./_cloneBuffer'),
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copyArray = require('./_copyArray'),
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copySymbols = require('./_copySymbols'),
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copySymbolsIn = require('./_copySymbolsIn'),
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getAllKeys = require('./_getAllKeys'),
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getAllKeysIn = require('./_getAllKeysIn'),
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getTag = require('./_getTag'),
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initCloneArray = require('./_initCloneArray'),
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initCloneByTag = require('./_initCloneByTag'),
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initCloneObject = require('./_initCloneObject'),
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isArray = require('./isArray'),
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isBuffer = require('./isBuffer'),
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isMap = require('./isMap'),
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isObject = require('./isObject'),
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isSet = require('./isSet'),
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keys = require('./keys'),
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keysIn = require('./keysIn');
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/** Used to compose bitmasks for cloning. */
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var CLONE_DEEP_FLAG = 1,
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CLONE_FLAT_FLAG = 2,
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CLONE_SYMBOLS_FLAG = 4;
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/** `Object#toString` result references. */
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var argsTag = '[object Arguments]',
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arrayTag = '[object Array]',
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boolTag = '[object Boolean]',
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dateTag = '[object Date]',
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errorTag = '[object Error]',
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funcTag = '[object Function]',
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genTag = '[object GeneratorFunction]',
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mapTag = '[object Map]',
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numberTag = '[object Number]',
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objectTag = '[object Object]',
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regexpTag = '[object RegExp]',
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setTag = '[object Set]',
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stringTag = '[object String]',
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symbolTag = '[object Symbol]',
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weakMapTag = '[object WeakMap]';
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var arrayBufferTag = '[object ArrayBuffer]',
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dataViewTag = '[object DataView]',
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float32Tag = '[object Float32Array]',
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float64Tag = '[object Float64Array]',
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int8Tag = '[object Int8Array]',
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int16Tag = '[object Int16Array]',
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int32Tag = '[object Int32Array]',
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uint8Tag = '[object Uint8Array]',
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uint8ClampedTag = '[object Uint8ClampedArray]',
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uint16Tag = '[object Uint16Array]',
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uint32Tag = '[object Uint32Array]';
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/** Used to identify `toStringTag` values supported by `_.clone`. */
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var cloneableTags = {};
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cloneableTags[argsTag] = cloneableTags[arrayTag] =
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cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
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cloneableTags[boolTag] = cloneableTags[dateTag] =
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cloneableTags[float32Tag] = cloneableTags[float64Tag] =
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cloneableTags[int8Tag] = cloneableTags[int16Tag] =
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cloneableTags[int32Tag] = cloneableTags[mapTag] =
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cloneableTags[numberTag] = cloneableTags[objectTag] =
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cloneableTags[regexpTag] = cloneableTags[setTag] =
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cloneableTags[stringTag] = cloneableTags[symbolTag] =
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cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
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cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
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cloneableTags[errorTag] = cloneableTags[funcTag] =
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cloneableTags[weakMapTag] = false;
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/**
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* The base implementation of `_.clone` and `_.cloneDeep` which tracks
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* traversed objects.
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*
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* @private
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* @param {*} value The value to clone.
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* @param {boolean} bitmask The bitmask flags.
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* 1 - Deep clone
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* 2 - Flatten inherited properties
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* 4 - Clone symbols
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* @param {Function} [customizer] The function to customize cloning.
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* @param {string} [key] The key of `value`.
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* @param {Object} [object] The parent object of `value`.
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* @param {Object} [stack] Tracks traversed objects and their clone counterparts.
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* @returns {*} Returns the cloned value.
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*/
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function baseClone(value, bitmask, customizer, key, object, stack) {
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var result,
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isDeep = bitmask & CLONE_DEEP_FLAG,
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isFlat = bitmask & CLONE_FLAT_FLAG,
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isFull = bitmask & CLONE_SYMBOLS_FLAG;
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if (customizer) {
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result = object ? customizer(value, key, object, stack) : customizer(value);
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}
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if (result !== undefined) {
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return result;
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}
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if (!isObject(value)) {
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return value;
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}
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var isArr = isArray(value);
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if (isArr) {
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result = initCloneArray(value);
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if (!isDeep) {
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return copyArray(value, result);
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}
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} else {
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var tag = getTag(value),
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isFunc = tag == funcTag || tag == genTag;
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if (isBuffer(value)) {
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return cloneBuffer(value, isDeep);
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}
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if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
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result = (isFlat || isFunc) ? {} : initCloneObject(value);
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if (!isDeep) {
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return isFlat
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? copySymbolsIn(value, baseAssignIn(result, value))
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: copySymbols(value, baseAssign(result, value));
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}
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} else {
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if (!cloneableTags[tag]) {
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return object ? value : {};
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}
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result = initCloneByTag(value, tag, isDeep);
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}
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}
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// Check for circular references and return its corresponding clone.
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stack || (stack = new Stack);
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var stacked = stack.get(value);
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if (stacked) {
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return stacked;
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}
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stack.set(value, result);
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if (isSet(value)) {
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value.forEach(function(subValue) {
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result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
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});
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} else if (isMap(value)) {
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value.forEach(function(subValue, key) {
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result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
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});
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}
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var keysFunc = isFull
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? (isFlat ? getAllKeysIn : getAllKeys)
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: (isFlat ? keysIn : keys);
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var props = isArr ? undefined : keysFunc(value);
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arrayEach(props || value, function(subValue, key) {
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if (props) {
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key = subValue;
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subValue = value[key];
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}
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// Recursively populate clone (susceptible to call stack limits).
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assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
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});
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return result;
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}
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module.exports = baseClone;
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