artdaq_node_server  v1_00_08
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_baseClone.js
1 var Stack = require('./_Stack'),
2  arrayEach = require('./_arrayEach'),
3  assignValue = require('./_assignValue'),
4  baseAssign = require('./_baseAssign'),
5  baseAssignIn = require('./_baseAssignIn'),
6  cloneBuffer = require('./_cloneBuffer'),
7  copyArray = require('./_copyArray'),
8  copySymbols = require('./_copySymbols'),
9  copySymbolsIn = require('./_copySymbolsIn'),
10  getAllKeys = require('./_getAllKeys'),
11  getAllKeysIn = require('./_getAllKeysIn'),
12  getTag = require('./_getTag'),
13  initCloneArray = require('./_initCloneArray'),
14  initCloneByTag = require('./_initCloneByTag'),
15  initCloneObject = require('./_initCloneObject'),
16  isArray = require('./isArray'),
17  isBuffer = require('./isBuffer'),
18  isObject = require('./isObject'),
19  keys = require('./keys');
20 
22 var CLONE_DEEP_FLAG = 1,
23  CLONE_FLAT_FLAG = 2,
24  CLONE_SYMBOLS_FLAG = 4;
25 
27 var argsTag = '[object Arguments]',
28  arrayTag = '[object Array]',
29  boolTag = '[object Boolean]',
30  dateTag = '[object Date]',
31  errorTag = '[object Error]',
32  funcTag = '[object Function]',
33  genTag = '[object GeneratorFunction]',
34  mapTag = '[object Map]',
35  numberTag = '[object Number]',
36  objectTag = '[object Object]',
37  regexpTag = '[object RegExp]',
38  setTag = '[object Set]',
39  stringTag = '[object String]',
40  symbolTag = '[object Symbol]',
41  weakMapTag = '[object WeakMap]';
42 
43 var arrayBufferTag = '[object ArrayBuffer]',
44  dataViewTag = '[object DataView]',
45  float32Tag = '[object Float32Array]',
46  float64Tag = '[object Float64Array]',
47  int8Tag = '[object Int8Array]',
48  int16Tag = '[object Int16Array]',
49  int32Tag = '[object Int32Array]',
50  uint8Tag = '[object Uint8Array]',
51  uint8ClampedTag = '[object Uint8ClampedArray]',
52  uint16Tag = '[object Uint16Array]',
53  uint32Tag = '[object Uint32Array]';
54 
56 var cloneableTags = {};
57 cloneableTags[argsTag] = cloneableTags[arrayTag] =
58 cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
59 cloneableTags[boolTag] = cloneableTags[dateTag] =
60 cloneableTags[float32Tag] = cloneableTags[float64Tag] =
61 cloneableTags[int8Tag] = cloneableTags[int16Tag] =
62 cloneableTags[int32Tag] = cloneableTags[mapTag] =
63 cloneableTags[numberTag] = cloneableTags[objectTag] =
64 cloneableTags[regexpTag] = cloneableTags[setTag] =
65 cloneableTags[stringTag] = cloneableTags[symbolTag] =
66 cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
67 cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
68 cloneableTags[errorTag] = cloneableTags[funcTag] =
69 cloneableTags[weakMapTag] = false;
70 
87 function baseClone(value, bitmask, customizer, key, object, stack) {
88  var result,
89  isDeep = bitmask & CLONE_DEEP_FLAG,
90  isFlat = bitmask & CLONE_FLAT_FLAG,
91  isFull = bitmask & CLONE_SYMBOLS_FLAG;
92 
93  if (customizer) {
94  result = object ? customizer(value, key, object, stack) : customizer(value);
95  }
96  if (result !== undefined) {
97  return result;
98  }
99  if (!isObject(value)) {
100  return value;
101  }
102  var isArr = isArray(value);
103  if (isArr) {
104  result = initCloneArray(value);
105  if (!isDeep) {
106  return copyArray(value, result);
107  }
108  } else {
109  var tag = getTag(value),
110  isFunc = tag == funcTag || tag == genTag;
111 
112  if (isBuffer(value)) {
113  return cloneBuffer(value, isDeep);
114  }
115  if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
116  result = (isFlat || isFunc) ? {} : initCloneObject(value);
117  if (!isDeep) {
118  return isFlat
119  ? copySymbolsIn(value, baseAssignIn(result, value))
120  : copySymbols(value, baseAssign(result, value));
121  }
122  } else {
123  if (!cloneableTags[tag]) {
124  return object ? value : {};
125  }
126  result = initCloneByTag(value, tag, baseClone, isDeep);
127  }
128  }
129  // Check for circular references and return its corresponding clone.
130  stack || (stack = new Stack);
131  var stacked = stack.get(value);
132  if (stacked) {
133  return stacked;
134  }
135  stack.set(value, result);
136 
137  var keysFunc = isFull
138  ? (isFlat ? getAllKeysIn : getAllKeys)
139  : (isFlat ? keysIn : keys);
140 
141  var props = isArr ? undefined : keysFunc(value);
142  arrayEach(props || value, function(subValue, key) {
143  if (props) {
144  key = subValue;
145  subValue = value[key];
146  }
147  // Recursively populate clone (susceptible to call stack limits).
148  assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
149  });
150  return result;
151 }
152 
153 module.exports = baseClone;