1 | var clone = (function() {
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2 | 'use strict';
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3 |
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4 | function _instanceof(obj, type) {
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5 | return type != null && obj instanceof type;
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6 | }
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7 |
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8 | var nativeMap;
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9 | try {
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10 | nativeMap = Map;
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11 | } catch(_) {
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12 |
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13 |
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14 | nativeMap = function() {};
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15 | }
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16 |
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17 | var nativeSet;
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18 | try {
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19 | nativeSet = Set;
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20 | } catch(_) {
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21 | nativeSet = function() {};
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22 | }
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23 |
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24 | var nativePromise;
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25 | try {
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26 | nativePromise = Promise;
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27 | } catch(_) {
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28 | nativePromise = function() {};
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29 | }
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30 |
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31 |
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50 |
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51 |
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52 | function clone(parent, circular, depth, prototype, includeNonEnumerable) {
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53 | if (typeof circular === 'object') {
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54 | depth = circular.depth;
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55 | prototype = circular.prototype;
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56 | includeNonEnumerable = circular.includeNonEnumerable;
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57 | circular = circular.circular;
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58 | }
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59 |
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60 |
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61 | var allParents = [];
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62 | var allChildren = [];
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63 |
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64 | var useBuffer = typeof Buffer != 'undefined';
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65 |
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66 | if (typeof circular == 'undefined')
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67 | circular = true;
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68 |
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69 | if (typeof depth == 'undefined')
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70 | depth = Infinity;
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71 |
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72 |
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73 | function _clone(parent, depth) {
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74 |
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75 | if (parent === null)
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76 | return null;
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77 |
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78 | if (depth === 0)
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79 | return parent;
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80 |
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81 | var child;
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82 | var proto;
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83 | if (typeof parent != 'object') {
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84 | return parent;
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85 | }
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86 |
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87 | if (_instanceof(parent, nativeMap)) {
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88 | child = new nativeMap();
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89 | } else if (_instanceof(parent, nativeSet)) {
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90 | child = new nativeSet();
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91 | } else if (_instanceof(parent, nativePromise)) {
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92 | child = new nativePromise(function (resolve, reject) {
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93 | parent.then(function(value) {
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94 | resolve(_clone(value, depth - 1));
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95 | }, function(err) {
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96 | reject(_clone(err, depth - 1));
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97 | });
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98 | });
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99 | } else if (clone.__isArray(parent)) {
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100 | child = [];
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101 | } else if (clone.__isRegExp(parent)) {
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102 | child = new RegExp(parent.source, __getRegExpFlags(parent));
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103 | if (parent.lastIndex) child.lastIndex = parent.lastIndex;
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104 | } else if (clone.__isDate(parent)) {
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105 | child = new Date(parent.getTime());
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106 | } else if (useBuffer && Buffer.isBuffer(parent)) {
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107 | if (Buffer.allocUnsafe) {
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108 |
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109 | child = Buffer.allocUnsafe(parent.length);
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110 | } else {
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111 |
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112 | child = new Buffer(parent.length);
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113 | }
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114 | parent.copy(child);
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115 | return child;
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116 | } else if (_instanceof(parent, Error)) {
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117 | child = Object.create(parent);
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118 | } else {
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119 | if (typeof prototype == 'undefined') {
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120 | proto = Object.getPrototypeOf(parent);
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121 | child = Object.create(proto);
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122 | }
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123 | else {
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124 | child = Object.create(prototype);
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125 | proto = prototype;
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126 | }
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127 | }
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128 |
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129 | if (circular) {
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130 | var index = allParents.indexOf(parent);
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131 |
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132 | if (index != -1) {
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133 | return allChildren[index];
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134 | }
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135 | allParents.push(parent);
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136 | allChildren.push(child);
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137 | }
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138 |
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139 | if (_instanceof(parent, nativeMap)) {
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140 | parent.forEach(function(value, key) {
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141 | var keyChild = _clone(key, depth - 1);
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142 | var valueChild = _clone(value, depth - 1);
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143 | child.set(keyChild, valueChild);
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144 | });
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145 | }
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146 | if (_instanceof(parent, nativeSet)) {
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147 | parent.forEach(function(value) {
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148 | var entryChild = _clone(value, depth - 1);
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149 | child.add(entryChild);
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150 | });
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151 | }
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152 |
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153 | for (var i in parent) {
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154 | var attrs;
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155 | if (proto) {
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156 | attrs = Object.getOwnPropertyDescriptor(proto, i);
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157 | }
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158 |
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159 | if (attrs && attrs.set == null) {
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160 | continue;
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161 | }
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162 | child[i] = _clone(parent[i], depth - 1);
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163 | }
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164 |
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165 | if (Object.getOwnPropertySymbols) {
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166 | var symbols = Object.getOwnPropertySymbols(parent);
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167 | for (var i = 0; i < symbols.length; i++) {
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168 |
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169 |
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170 | var symbol = symbols[i];
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171 | var descriptor = Object.getOwnPropertyDescriptor(parent, symbol);
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172 | if (descriptor && !descriptor.enumerable && !includeNonEnumerable) {
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173 | continue;
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174 | }
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175 | child[symbol] = _clone(parent[symbol], depth - 1);
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176 | if (!descriptor.enumerable) {
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177 | Object.defineProperty(child, symbol, {
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178 | enumerable: false
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179 | });
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180 | }
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181 | }
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182 | }
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183 |
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184 | if (includeNonEnumerable) {
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185 | var allPropertyNames = Object.getOwnPropertyNames(parent);
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186 | for (var i = 0; i < allPropertyNames.length; i++) {
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187 | var propertyName = allPropertyNames[i];
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188 | var descriptor = Object.getOwnPropertyDescriptor(parent, propertyName);
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189 | if (descriptor && descriptor.enumerable) {
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190 | continue;
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191 | }
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192 | child[propertyName] = _clone(parent[propertyName], depth - 1);
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193 | Object.defineProperty(child, propertyName, {
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194 | enumerable: false
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195 | });
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196 | }
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197 | }
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198 |
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199 | return child;
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200 | }
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201 |
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202 | return _clone(parent, depth);
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203 | }
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204 |
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205 |
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206 |
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207 |
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208 |
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209 |
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210 |
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211 |
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212 | clone.clonePrototype = function clonePrototype(parent) {
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213 | if (parent === null)
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214 | return null;
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215 |
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216 | var c = function () {};
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217 | c.prototype = parent;
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218 | return new c();
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219 | };
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220 |
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221 |
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222 |
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223 | function __objToStr(o) {
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224 | return Object.prototype.toString.call(o);
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225 | }
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226 | clone.__objToStr = __objToStr;
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227 |
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228 | function __isDate(o) {
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229 | return typeof o === 'object' && __objToStr(o) === '[object Date]';
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230 | }
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231 | clone.__isDate = __isDate;
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232 |
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233 | function __isArray(o) {
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234 | return typeof o === 'object' && __objToStr(o) === '[object Array]';
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235 | }
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236 | clone.__isArray = __isArray;
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237 |
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238 | function __isRegExp(o) {
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239 | return typeof o === 'object' && __objToStr(o) === '[object RegExp]';
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240 | }
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241 | clone.__isRegExp = __isRegExp;
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242 |
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243 | function __getRegExpFlags(re) {
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244 | var flags = '';
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245 | if (re.global) flags += 'g';
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246 | if (re.ignoreCase) flags += 'i';
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247 | if (re.multiline) flags += 'm';
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248 | return flags;
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249 | }
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250 | clone.__getRegExpFlags = __getRegExpFlags;
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251 |
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252 | return clone;
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253 | })();
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254 |
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255 | if (typeof module === 'object' && module.exports) {
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256 | module.exports = clone;
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257 | }
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