diff options
Diffstat (limited to 'node_modules/lodash/_baseClone.js')
-rw-r--r-- | node_modules/lodash/_baseClone.js | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/node_modules/lodash/_baseClone.js b/node_modules/lodash/_baseClone.js new file mode 100644 index 0000000..290de92 --- /dev/null +++ b/node_modules/lodash/_baseClone.js @@ -0,0 +1,165 @@ +var Stack = require('./_Stack'), + arrayEach = require('./_arrayEach'), + assignValue = require('./_assignValue'), + baseAssign = require('./_baseAssign'), + baseAssignIn = require('./_baseAssignIn'), + cloneBuffer = require('./_cloneBuffer'), + copyArray = require('./_copyArray'), + copySymbols = require('./_copySymbols'), + copySymbolsIn = require('./_copySymbolsIn'), + getAllKeys = require('./_getAllKeys'), + getAllKeysIn = require('./_getAllKeysIn'), + getTag = require('./_getTag'), + initCloneArray = require('./_initCloneArray'), + initCloneByTag = require('./_initCloneByTag'), + initCloneObject = require('./_initCloneObject'), + isArray = require('./isArray'), + isBuffer = require('./isBuffer'), + isMap = require('./isMap'), + isObject = require('./isObject'), + isSet = require('./isSet'), + keys = require('./keys'); + +/** Used to compose bitmasks for cloning. */ +var CLONE_DEEP_FLAG = 1, + CLONE_FLAT_FLAG = 2, + CLONE_SYMBOLS_FLAG = 4; + +/** `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]', + dataViewTag = '[object DataView]', + 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[dataViewTag] = +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} bitmask The bitmask flags. + * 1 - Deep clone + * 2 - Flatten inherited properties + * 4 - Clone symbols + * @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, bitmask, customizer, key, object, stack) { + var result, + isDeep = bitmask & CLONE_DEEP_FLAG, + isFlat = bitmask & CLONE_FLAT_FLAG, + isFull = bitmask & CLONE_SYMBOLS_FLAG; + + 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 (isBuffer(value)) { + return cloneBuffer(value, isDeep); + } + if (tag == objectTag || tag == argsTag || (isFunc && !object)) { + result = (isFlat || isFunc) ? {} : initCloneObject(value); + if (!isDeep) { + return isFlat + ? copySymbolsIn(value, baseAssignIn(result, value)) + : copySymbols(value, baseAssign(result, value)); + } + } else { + if (!cloneableTags[tag]) { + return object ? value : {}; + } + result = initCloneByTag(value, tag, isDeep); + } + } + // 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); + + if (isSet(value)) { + value.forEach(function(subValue) { + result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack)); + }); + } else if (isMap(value)) { + value.forEach(function(subValue, key) { + result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack)); + }); + } + + var keysFunc = isFull + ? (isFlat ? getAllKeysIn : getAllKeys) + : (isFlat ? keysIn : keys); + + var props = isArr ? undefined : keysFunc(value); + arrayEach(props || value, function(subValue, key) { + if (props) { + key = subValue; + subValue = value[key]; + } + // Recursively populate clone (susceptible to call stack limits). + assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack)); + }); + return result; +} + +module.exports = baseClone; |