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6 | "use strict";
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7 |
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8 | const normalize = require("./normalize");
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9 | const join = require("./join");
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10 | const MemoryFileSystemError = require("./MemoryFileSystemError");
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11 | const errors = require("errno");
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12 | const stream = require("readable-stream");
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13 |
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14 | const ReadableStream = stream.Readable;
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15 | const WritableStream = stream.Writable;
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16 |
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17 | function isDir(item) {
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18 | if(typeof item !== "object") return false;
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19 | return item[""] === true;
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20 | }
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21 |
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22 | function isFile(item) {
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23 | if(typeof item !== "object") return false;
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24 | return !item[""];
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25 | }
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26 |
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27 | function pathToArray(path) {
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28 | path = normalize(path);
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29 | const nix = /^\//.test(path);
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30 | if(!nix) {
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31 | if(!/^[A-Za-z]:/.test(path)) {
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32 | throw new MemoryFileSystemError(errors.code.EINVAL, path);
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33 | }
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34 | path = path.replace(/[\\\/]+/g, "\\");
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35 | path = path.split(/[\\\/]/);
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36 | path[0] = path[0].toUpperCase();
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37 | } else {
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38 | path = path.replace(/\/+/g, "/");
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39 | path = path.substr(1).split("/");
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40 | }
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41 | if(!path[path.length-1]) path.pop();
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42 | return path;
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43 | }
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44 |
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45 | function trueFn() { return true; }
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46 | function falseFn() { return false; }
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47 |
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48 | class MemoryFileSystem {
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49 | constructor(data) {
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50 | this.data = data || {};
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51 | this.join = join;
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52 | this.pathToArray = pathToArray;
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53 | this.normalize = normalize;
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54 | }
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55 |
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56 | meta(_path) {
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57 | const path = pathToArray(_path);
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58 | let current = this.data;
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59 | let i = 0;
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60 | for(; i < path.length - 1; i++) {
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61 | if(!isDir(current[path[i]]))
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62 | return;
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63 | current = current[path[i]];
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64 | }
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65 | return current[path[i]];
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66 | }
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67 |
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68 | existsSync(_path) {
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69 | return !!this.meta(_path);
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70 | }
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71 |
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72 | statSync(_path) {
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73 | let current = this.meta(_path);
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74 | if(_path === "/" || isDir(current)) {
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75 | return {
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76 | isFile: falseFn,
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77 | isDirectory: trueFn,
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78 | isBlockDevice: falseFn,
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79 | isCharacterDevice: falseFn,
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80 | isSymbolicLink: falseFn,
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81 | isFIFO: falseFn,
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82 | isSocket: falseFn
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83 | };
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84 | } else if(isFile(current)) {
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85 | return {
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86 | isFile: trueFn,
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87 | isDirectory: falseFn,
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88 | isBlockDevice: falseFn,
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89 | isCharacterDevice: falseFn,
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90 | isSymbolicLink: falseFn,
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91 | isFIFO: falseFn,
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92 | isSocket: falseFn
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93 | };
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94 | } else {
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95 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "stat");
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96 | }
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97 | }
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98 |
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99 | readFileSync(_path, optionsOrEncoding) {
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100 | const path = pathToArray(_path);
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101 | let current = this.data;
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102 | let i = 0
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103 | for(; i < path.length - 1; i++) {
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104 | if(!isDir(current[path[i]]))
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105 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readFile");
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106 | current = current[path[i]];
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107 | }
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108 | if(!isFile(current[path[i]])) {
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109 | if(isDir(current[path[i]]))
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110 | throw new MemoryFileSystemError(errors.code.EISDIR, _path, "readFile");
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111 | else
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112 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readFile");
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113 | }
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114 | current = current[path[i]];
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115 | const encoding = typeof optionsOrEncoding === "object" ? optionsOrEncoding.encoding : optionsOrEncoding;
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116 | return encoding ? current.toString(encoding) : current;
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117 | }
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118 |
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119 | readdirSync(_path) {
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120 | if(_path === "/") return Object.keys(this.data).filter(Boolean);
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121 | const path = pathToArray(_path);
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122 | let current = this.data;
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123 | let i = 0;
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124 | for(; i < path.length - 1; i++) {
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125 | if(!isDir(current[path[i]]))
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126 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readdir");
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127 | current = current[path[i]];
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128 | }
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129 | if(!isDir(current[path[i]])) {
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130 | if(isFile(current[path[i]]))
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131 | throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "readdir");
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132 | else
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133 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "readdir");
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134 | }
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135 | return Object.keys(current[path[i]]).filter(Boolean);
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136 | }
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137 |
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138 | mkdirpSync(_path) {
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139 | const path = pathToArray(_path);
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140 | if(path.length === 0) return;
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141 | let current = this.data;
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142 | for(let i = 0; i < path.length; i++) {
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143 | if(isFile(current[path[i]]))
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144 | throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "mkdirp");
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145 | else if(!isDir(current[path[i]]))
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146 | current[path[i]] = {"":true};
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147 | current = current[path[i]];
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148 | }
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149 | return;
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150 | }
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151 |
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152 | mkdirSync(_path) {
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153 | const path = pathToArray(_path);
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154 | if(path.length === 0) return;
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155 | let current = this.data;
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156 | let i = 0;
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157 | for(; i < path.length - 1; i++) {
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158 | if(!isDir(current[path[i]]))
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159 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "mkdir");
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160 | current = current[path[i]];
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161 | }
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162 | if(isDir(current[path[i]]))
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163 | throw new MemoryFileSystemError(errors.code.EEXIST, _path, "mkdir");
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164 | else if(isFile(current[path[i]]))
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165 | throw new MemoryFileSystemError(errors.code.ENOTDIR, _path, "mkdir");
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166 | current[path[i]] = {"":true};
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167 | return;
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168 | }
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169 |
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170 | _remove(_path, name, testFn) {
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171 | const path = pathToArray(_path);
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172 | const operation = name === "File" ? "unlink" : "rmdir";
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173 | if(path.length === 0) {
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174 | throw new MemoryFileSystemError(errors.code.EPERM, _path, operation);
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175 | }
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176 | let current = this.data;
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177 | let i = 0;
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178 | for(; i < path.length - 1; i++) {
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179 | if(!isDir(current[path[i]]))
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180 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, operation);
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181 | current = current[path[i]];
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182 | }
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183 | if(!testFn(current[path[i]]))
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184 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, operation);
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185 | delete current[path[i]];
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186 | return;
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187 | }
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188 |
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189 | rmdirSync(_path) {
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190 | return this._remove(_path, "Directory", isDir);
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191 | }
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192 |
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193 | unlinkSync(_path) {
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194 | return this._remove(_path, "File", isFile);
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195 | }
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196 |
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197 | readlinkSync(_path) {
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198 | throw new MemoryFileSystemError(errors.code.ENOSYS, _path, "readlink");
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199 | }
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200 |
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201 | writeFileSync(_path, content, optionsOrEncoding) {
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202 | if(!content && !optionsOrEncoding) throw new Error("No content");
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203 | const path = pathToArray(_path);
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204 | if(path.length === 0) {
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205 | throw new MemoryFileSystemError(errors.code.EISDIR, _path, "writeFile");
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206 | }
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207 | let current = this.data;
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208 | let i = 0
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209 | for(; i < path.length - 1; i++) {
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210 | if(!isDir(current[path[i]]))
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211 | throw new MemoryFileSystemError(errors.code.ENOENT, _path, "writeFile");
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212 | current = current[path[i]];
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213 | }
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214 | if(isDir(current[path[i]]))
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215 | throw new MemoryFileSystemError(errors.code.EISDIR, _path, "writeFile");
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216 | const encoding = typeof optionsOrEncoding === "object" ? optionsOrEncoding.encoding : optionsOrEncoding;
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217 | current[path[i]] = optionsOrEncoding || typeof content === "string" ? new Buffer(content, encoding) : content;
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218 | return;
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219 | }
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220 |
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221 |
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222 | createReadStream(path, options) {
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223 | let stream = new ReadableStream();
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224 | let done = false;
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225 | let data;
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226 | try {
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227 | data = this.readFileSync(path);
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228 | } catch (e) {
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229 | stream._read = function() {
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230 | if (done) {
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231 | return;
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232 | }
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233 | done = true;
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234 | this.emit('error', e);
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235 | this.push(null);
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236 | };
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237 | return stream;
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238 | }
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239 | options = options || { };
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240 | options.start = options.start || 0;
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241 | options.end = options.end || data.length;
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242 | stream._read = function() {
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243 | if (done) {
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244 | return;
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245 | }
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246 | done = true;
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247 | this.push(data.slice(options.start, options.end));
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248 | this.push(null);
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249 | };
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250 | return stream;
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251 | }
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252 |
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253 | createWriteStream(path) {
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254 | let stream = new WritableStream();
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255 | try {
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256 |
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257 | this.writeFileSync(path, new Buffer(0));
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258 | } catch(e) {
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259 |
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260 | stream.once('prefinish', function() {
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261 | stream.emit('error', e);
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262 | });
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263 | return stream;
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264 | }
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265 | let bl = [ ], len = 0;
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266 | stream._write = (chunk, encoding, callback) => {
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267 | bl.push(chunk);
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268 | len += chunk.length;
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269 | this.writeFile(path, Buffer.concat(bl, len), callback);
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270 | }
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271 | return stream;
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272 | }
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273 |
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274 |
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275 | exists(path, callback) {
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276 | return callback(this.existsSync(path));
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277 | }
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278 |
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279 | writeFile(path, content, encoding, callback) {
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280 | if(!callback) {
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281 | callback = encoding;
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282 | encoding = undefined;
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283 | }
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284 | try {
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285 | this.writeFileSync(path, content, encoding);
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286 | } catch(e) {
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287 | return callback(e);
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288 | }
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289 | return callback();
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290 | }
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291 | }
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292 |
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293 |
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294 |
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295 | ["stat", "readdir", "mkdirp", "rmdir", "unlink", "readlink"].forEach(function(fn) {
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296 | MemoryFileSystem.prototype[fn] = function(path, callback) {
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297 | let result;
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298 | try {
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299 | result = this[fn + "Sync"](path);
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300 | } catch(e) {
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301 | setImmediate(function() {
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302 | callback(e);
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303 | });
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304 |
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305 | return;
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306 | }
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307 | setImmediate(function() {
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308 | callback(null, result);
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309 | });
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310 | };
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311 | });
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312 |
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313 | ["mkdir", "readFile"].forEach(function(fn) {
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314 | MemoryFileSystem.prototype[fn] = function(path, optArg, callback) {
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315 | if(!callback) {
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316 | callback = optArg;
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317 | optArg = undefined;
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318 | }
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319 | let result;
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320 | try {
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321 | result = this[fn + "Sync"](path, optArg);
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322 | } catch(e) {
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323 | setImmediate(function() {
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324 | callback(e);
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325 | });
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326 |
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327 | return;
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328 | }
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329 | setImmediate(function() {
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330 | callback(null, result);
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331 | });
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332 | };
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333 | });
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334 |
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335 | module.exports = MemoryFileSystem;
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