├── CONTRIBUTING.md
├── .gitignore
├── .travis.yml
├── binding.gyp
├── tests
    └── single-worker.js
├── example
    ├── main.worker.js
    └── app.js
├── .gitlab-ci.yml
├── package.json
├── src
    ├── WebWorkerWrap.h
    ├── bootstrap_worker.js
    ├── WebWorkerWrap.cc
    └── internal
    │   ├── errors.js
    │   ├── events.js
    │   └── path.js
├── README.md
├── lib
    └── index.js
└── LICENSE


/CONTRIBUTING.md:
--------------------------------------------------------------------------------
1 | See https://opensource.guide/


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | package-lock.json
2 | 
3 | node_modules/
4 | build/
5 | coverage/
6 | .nyc_output/
7 | 
8 | .DS_Store
9 | 


--------------------------------------------------------------------------------
/.travis.yml:
--------------------------------------------------------------------------------
 1 | language: node_js
 2 | dist: trusty
 3 | sudo: required
 4 | 
 5 | node_js:
 6 |   - "8.0.0"
 7 | 
 8 | cache:
 9 |   directories:
10 |     - node_modules # NPM packages
11 | 
12 | install:
13 |   - npm install
14 | 
15 | script:
16 |   - npm test
17 | 


--------------------------------------------------------------------------------
/binding.gyp:
--------------------------------------------------------------------------------
 1 | {
 2 |   "targets": [{
 3 |     "target_name": "webworker",
 4 |     "include_dirs": [
 5 |       "/usr/local/include/node",
 6 |       "<!(node -e \"require('nan')\")",
 7 |       "./",
 8 |     ],
 9 |     "sources": [
10 |       "src/WebWorkerWrap.cc",
11 |     ],
12 |     "cflags_cc!": [ 
13 |       "-fno-exceptions", "-std=c++11" 
14 |     ],
15 |     "libraries": [
16 |       "-lpthread",
17 |     ],
18 |   }]
19 | }


--------------------------------------------------------------------------------
/tests/single-worker.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const test = require('tape');
 4 | const WebWorker = require('../').WebWorker;
 5 | 
 6 | test('single worker', (t) => {
 7 |   t.plan(1);
 8 |   let worker = new WebWorker(function() {
 9 |     console.log('foobar');
10 |   });
11 |   worker.onstdout = function(data) {
12 |     t.equal(data, 'foobar');
13 |     t.end();
14 |     worker.terminate();
15 |     process.exit();
16 |   };
17 | });


--------------------------------------------------------------------------------
/example/main.worker.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | let aliveTimer = setInterval(() => {
 4 |   console.log('i am still in alive...', Date());
 5 | }, 2000);
 6 | 
 7 | module.exports = function(self) {
 8 | 
 9 |   self.onmessage = function(data) {
10 |     console.log('received the message from host', JSON.stringify(data));
11 |   };
12 | 
13 |   self.postMessage({
14 |     worker: true
15 |   });
16 | 
17 |   setTimeout(() => {
18 |     self.postMessage({
19 |       stopWorker2: true
20 |     });
21 |   }, 6000);
22 | 
23 | };
24 | 


--------------------------------------------------------------------------------
/.gitlab-ci.yml:
--------------------------------------------------------------------------------
 1 | # Official framework image. Look for the different tagged releases at:
 2 | # https://hub.docker.com/r/library/node/tags/
 3 | image: node:8
 4 | 
 5 | before_script:
 6 |   - npm install
 7 | 
 8 | # This folder is cached between builds
 9 | # http://docs.gitlab.com/ce/ci/yaml/README.html#cache
10 | cache:
11 |   paths:
12 |     - node_modules/
13 | 
14 | # test:lint:
15 | #   script:
16 | #     - npm run lint
17 | 
18 | test:
19 |   script:
20 |     - npm test
21 | 
22 | # Publish tagged versions to npm
23 | # publish:
24 | #   stage: deploy
25 | #   only:
26 | #     - tags
27 | #     - triggers
28 | #   script:
29 | #     - npm publish


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "webworker-ng",
 3 |   "version": "0.6.19",
 4 |   "description": "The Web Worker implementation based on thread for Node.js",
 5 |   "main": "lib/index.js",
 6 |   "scripts": {
 7 |     "test": "nyc --reporter=lcov tape tests/*.js"
 8 |   },
 9 |   "keywords": [
10 |     "threads",
11 |     "webworker",
12 |     "rokid"
13 |   ],
14 |   "author": "Yazhong Liu <yazhong.liu@rokid.com>",
15 |   "license": "UNLICENSED",
16 |   "dependencies": {
17 |     "bindings": "1.3.0",
18 |     "is-plain-object": "^2.0.4",
19 |     "nan": "2.6.2"
20 |   },
21 |   "devDependencies": {
22 |     "tape": "4.8.0",
23 |     "nyc": "^11.2.1"
24 |   },
25 |   "nyc": {
26 |     "exclude": [
27 |       "build",
28 |       "node_modules",
29 |       "coverage",
30 |       "tests/*.js"
31 |     ]
32 |   }
33 | }
34 | 


--------------------------------------------------------------------------------
/example/app.js:
--------------------------------------------------------------------------------
 1 | 'use strict';
 2 | 
 3 | const WebWorker = require('../').WebWorker;
 4 | const worker = new WebWorker((self) => {
 5 |   // Note: code is in new v8 runtime
 6 |   require('./example/main.worker.js')(self);
 7 | });
 8 | 
 9 | let shouldStopWorker2 = false;
10 | 
11 | worker.onstdout = function(text) {
12 |   console.log('onstdout', text);
13 | };
14 | 
15 | worker.onstderr = function(err) {
16 |   console.log('onstderr', err);
17 | };
18 | 
19 | worker.onmessage = function(data) {
20 |   if (data && data.stopWorker2 === true) {
21 |     shouldStopWorker2 = true;
22 |     return;
23 |   }
24 |   console.log('received message from worker:', data);
25 |   setTimeout(() => {
26 |     worker.postMessage({ host: true });
27 |   }, 100);
28 | };
29 | 
30 | {
31 |   let wrongWorker = new WebWorker((self, send, check) => {
32 |     send('start');
33 |     while (true) {
34 |       // Do nothing
35 |       if (check()) break;
36 |     }
37 |     send('end');
38 |   }, {
39 |     defines: [
40 |       function postMessage2worker(msg) {
41 |         worker.postMessage(`from wrong worker: ${msg}`);
42 |         if (msg === 'end') {
43 |           worker.terminate();
44 |         }
45 |       },
46 |       function check() {
47 |         return shouldStopWorker2;
48 |       }
49 |     ]
50 |   });
51 | }


--------------------------------------------------------------------------------
/src/WebWorkerWrap.h:
--------------------------------------------------------------------------------
 1 | #pragma once
 2 | 
 3 | #include <stdio.h>
 4 | #include <uv.h>
 5 | #include <node.h>
 6 | #include <nan.h>
 7 | #include <string>
 8 | #include <map>
 9 | 
10 | using namespace v8;
11 | using namespace std;
12 | 
13 | class WebWorkerWrap : public Nan::ObjectWrap {
14 | public:
15 |   static NAN_MODULE_INIT(Init);
16 | 
17 | private:
18 |   explicit WebWorkerWrap(const char*);
19 |   ~WebWorkerWrap();
20 |   void InitThread(Isolate*);
21 |   void Deinit();
22 | 
23 |   const char* source;
24 |   const char* root;
25 |   uv_thread_t thread;
26 |   uv_async_t master_handle;
27 |   uv_sem_t worker_locker;
28 |   uv_sem_t request_locker;
29 |   bool destroyed_ = false;
30 | 
31 |   Isolate* worker_isolate;
32 |   int should_terminate = 0;
33 |   int worker_isolate_exited = 0;
34 |   Local<Context> worker_context;
35 |   std::map<std::string, Persistent<Function>> callbacks_;
36 |   char* callback_id = nullptr;
37 |   SharedArrayBuffer::Contents callback_data;
38 |   SharedArrayBuffer::Contents script_args;
39 | 
40 |   char* request_name;
41 |   char* request_args;
42 |   SharedArrayBuffer::Contents request_returns;
43 |   Persistent<Function> onrequest_;
44 | 
45 |   Local<Function> Compile(const char* name, const char* source);
46 |   Local<Function> GetBootstrapScript();
47 |   void Execute(MaybeLocal<Script> script, int argc, Local<Value> argv[]);
48 | 
49 |   static void ReportError(TryCatch* try_catch);
50 |   static void CleanupThread(void*);
51 |   static void CreateTask(void*);
52 |   static void MasterCallback(uv_async_t*);
53 |   void WorkerCallback(Local<Function>);
54 | 
55 |   // Worker APIs
56 |   static void Writeln(const FunctionCallbackInfo<Value>&);
57 |   static void Compile(const FunctionCallbackInfo<Value>&);
58 |   static void CheckPoint(const FunctionCallbackInfo<Value>&);
59 |   static void DefineRemoteMethod(const FunctionCallbackInfo<Value>&);
60 |   static void QueueCallback(const FunctionCallbackInfo<Value>&);
61 | 
62 |   // instance methods
63 |   static NAN_METHOD(New);
64 |   static NAN_METHOD(Send);
65 |   static NAN_METHOD(Start);
66 |   static NAN_METHOD(Terminate);
67 |   static NAN_METHOD(ForceTerminate);
68 |   static NAN_PROPERTY_GETTER(GetDestroyed);
69 | };
70 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | # node-webworker
  2 | 
  3 | [Web Worker][] implementation for Node.js. This module provides multi-threads programming for
  4 | Node.js user-land by borrowing the concept of the standard Web Worker.
  5 | 
  6 | ## Get Started
  7 | 
  8 | ```js
  9 | 'use strict';
 10 | const WebWorker = require('webworker-ng').WebWorker;
 11 | const worker = new WebWorker((self) => {
 12 |   self.postMessage('foobar', {yorkie: true});
 13 |   self.on('message', (data) => {
 14 |     console.log(data);
 15 |   });
 16 | }, {
 17 |   timeout: 5000,  // terminate after timeout
 18 |   defines: [],    // the parameters/objects passing to Worker
 19 | });
 20 | 
 21 | worker.postMessage({foo: 'bar'});
 22 | worker.onmessage = function(data) {
 23 |   // get message from worker
 24 | };
 25 | ```
 26 | 
 27 | ## APIs
 28 | 
 29 | The node-webworker provides the class `WebWorker` for creating a separate worker.
 30 | 
 31 | #### Creating a webworker script
 32 | 
 33 | A `WebWorker` instance is corresponding a script to run, in low-level implementation, it creates
 34 | a thread to sperate the v8 stack from the main.
 35 | 
 36 | The constructor `WebWorker(script, options)` accepts:
 37 | 
 38 | - {Function} `script` the source code function which runs in worker. Will support the path to run.
 39 | - {Object} `options` the options to config the worker
 40 |   - {Number} `options.timeout` the microsecond number to terminate forcily.
 41 |   - {Array} `options.define` the array of parameters to pass in worker context.
 42 | 
 43 | #### Messaging
 44 | 
 45 | In host environment, namely the Node.js, every `WebWorker` instance owns the method `postMessage` and
 46 | the listener `onmessage`.
 47 | 
 48 | ```js
 49 | worker.postMessage('some data');
 50 | worker.onmessage = function(data) {
 51 |   // TODO
 52 | };
 53 | ```
 54 | 
 55 | Correspondingly, in every worker context, it owns the same like the following:
 56 | 
 57 | ```js
 58 | const worker = new WebWorker(function(self) {
 59 |   self.onmessage = function(data) { .. };
 60 |   self.postMessage('some data sent from worker');
 61 | });
 62 | ```
 63 | 
 64 | #### Collecting `stdout` and `stderr`
 65 | 
 66 | In worker context, the methods under `console` as `console.log()` and `console.error` are delegated by `node-webworker`
 67 | which allows user to collect worker logs by worker as the following:
 68 | 
 69 | ```js
 70 | const worker = new WebWorker(function(self) {
 71 |   console.log('this sent to stdout');
 72 |   console.error('this sent to stderr');
 73 | });
 74 | worker.onstdout = function(msg) { ... };
 75 | worker.onstderr = function(msg) { ... };
 76 | ```
 77 | 
 78 | #### Modular worker
 79 | 
 80 | In web worker, you can use the following builtin modules:
 81 | 
 82 | - `events` - the Node.js official `events` mirror module
 83 | - `path` - the Node.js official `path` mirror module
 84 | 
 85 | The other hand, you can also load your CommonJS file into your worker:
 86 | 
 87 | ```js
 88 | const worker = new WebWorker(function(self) {
 89 |   require('./tests/load-worker.js');
 90 | });
 91 | ```
 92 | 
 93 | Note: The default path routing is from the `process.cwd()`.
 94 | 
 95 | ## Installation
 96 | 
 97 | ```sh
 98 | $ npm install webworker-ng --save
 99 | ```
100 | 
101 | ## Tests
102 | 
103 | ```sh
104 | $ npm test
105 | ```
106 | 
107 | ## License
108 | 
109 | [Apache License 2.0](LICENSE)
110 | 
111 | [Web Worker]: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
112 | 


--------------------------------------------------------------------------------
/src/bootstrap_worker.js:
--------------------------------------------------------------------------------
  1 | (function(worker, global, script, params, __dirname) {
  2 |   'use strict';
  3 | 
  4 |   let remoteCallbackId = 0;
  5 | 
  6 |   function parseRemoteObject(object) {
  7 |     if (object && object.type === 'Error') {
  8 |       let err = new Error(object.message);
  9 |       err.stack = object.stack;
 10 |       return err;
 11 |     } else {
 12 |       for (let name in object) {
 13 |         let prop = object[name];
 14 |         if (/^method:/.test(prop)) {
 15 |           object[name] = (...args) => callRemoteMethod(prop, args);
 16 |         }
 17 |       }
 18 |       return object;
 19 |     }
 20 |   }
 21 | 
 22 |   function convertCallback(item) {
 23 |     if (typeof item === 'function') {
 24 |       const id = remoteCallbackId++;
 25 |       worker.queueCallback(id, (objects) => {
 26 |         item.apply(null, 
 27 |           objects.map(parseRemoteObject));
 28 |       });
 29 |       return `callback:${id}`;
 30 |     } else if (item instanceof Error) {
 31 |       const errData = {
 32 |         name: item.name,
 33 |         message: item.message,
 34 |         stack: item.stack,
 35 |       };
 36 |       return `error:${JSON.stringify(errData)}`;
 37 |     } else {
 38 |       return item;
 39 |     }
 40 |   }
 41 | 
 42 |   global.callRemoteMethod = function(name, items) {
 43 |     return worker.defineRemoteMethod(name, 
 44 |       Array.from(items).map(convertCallback));
 45 |   };
 46 | 
 47 |   function handleMessageEvent() {
 48 |     if (typeof worker.onmessage === 'function') {
 49 |       worker.onmessage.apply(worker, arguments);
 50 |     }
 51 |   }
 52 | 
 53 |   function createInnerMessageChannel(handler) {
 54 |     return callRemoteMethod('$.prePostMessage', [handler]);
 55 |   }
 56 |   createInnerMessageChannel(handleMessageEvent);
 57 | 
 58 |   global.postMessage = function() {
 59 |     return callRemoteMethod('$.onmessage', arguments);
 60 |   };
 61 |   worker.postMessage = global.postMessage;
 62 | 
 63 |   global.setTimeout = function(timer, interval) {
 64 |     return callRemoteMethod('setTimeout', arguments);
 65 |   };
 66 | 
 67 |   global.clearTimeout = function(timer, interval) {
 68 |     return callRemoteMethod('clearTimeout', arguments);
 69 |   };
 70 | 
 71 |   global.setInterval = function(timer, interval) {
 72 |     return callRemoteMethod('setInterval', arguments);
 73 |   };
 74 | 
 75 |   global.clearInterval = function(timer) {
 76 |     return callRemoteMethod('clearInterval', arguments);
 77 |   };
 78 | 
 79 |   global.console = {
 80 |     log: function() {
 81 |       return callRemoteMethod('$.onstdout', arguments);
 82 |     },
 83 |     debug: function() {
 84 |       return callRemoteMethod('$.onstdout', arguments);
 85 |     },
 86 |     warn: function() {
 87 |       return callRemoteMethod('$.onstderr', arguments);
 88 |     },
 89 |     error: function() {
 90 |       return callRemoteMethod('$.onstderr', arguments);
 91 |     }
 92 |   };
 93 | 
 94 |   const process = global.process = {
 95 |     cwd: function() {
 96 |       return callRemoteMethod('process.cwd', arguments);
 97 |     },
 98 |   };
 99 | 
100 |   global.fs = {
101 |     readFile: function() {
102 |       return callRemoteMethod('fs.readFile', arguments);
103 |     }
104 |   };
105 | 
106 |   const builtins = {
107 |     'errors': __dirname + '/src/internal/errors.js',
108 |     'events': __dirname + '/src/internal/events.js',
109 |     'path': __dirname + '/src/internal/path.js',
110 |   };
111 |   global.require = require;
112 | 
113 |   // load the builtins modules internally, treats all dirname to be
114 |   // __dirname of this source file
115 |   function __import__(name) {
116 |     const module = {
117 |       dirname: __dirname,
118 |       exports: {},
119 |     };
120 |     name = builtins[name] ? builtins[name] : name;
121 |     let func = $compile(name);
122 |     if (typeof func !== 'function')
123 |       throw new Error(`Cannot find module '${name}'`);
124 | 
125 |     func(
126 |       module.exports, 
127 |       module, 
128 |       __import__, // require
129 |       __dirname); // __dirname
130 |     return module.exports;
131 |   }
132 | 
133 |   function __importExternal__(filename, dirname, mName) {
134 |     // for external modules, allows the name without .js
135 |     // TODO(Yorkie): walk for package.json?
136 |     if (!/.js$/.test(filename)) {
137 |       filename += '.js';
138 |     }
139 |     const module = {
140 |       dirname,
141 |       exports: {},
142 |     };
143 | 
144 |     const func = $compile(filename);
145 |     if (typeof func !== 'function')
146 |       throw new Error(`Cannot find module '${mName}' from ${filename}`);
147 | 
148 |     func(
149 |       module.exports, 
150 |       module, 
151 |       require.bind(module), // require
152 |       dirname);             // __dirname
153 |     return module.exports;
154 |   }
155 | 
156 |   function require(name) {
157 |     const path = __import__(builtins.path);
158 |     const dirname = path.dirname(name);
159 |     if (builtins[name]) {
160 |       return __import__(builtins[name], dirname);
161 |     } else {
162 |       if (path.isAbsolute(name)) {
163 |         return __importExternal__(name, dirname);
164 |       } else {
165 |         let base = process.cwd();
166 |         if (this && this.dirname) {
167 |           base = this.dirname;
168 |         }
169 |         const filename = path.join(base, name);
170 |         const dirname = path.dirname(filename);
171 |         return __importExternal__(filename, dirname, name);
172 |       }
173 |     }
174 |   }
175 | 
176 |   // TODO(Yazhong): disable http method
177 |   // global.http = {
178 |   //   get: function() {
179 |   //     return callRemoteMethod('http.get', arguments);
180 |   //   },
181 |   //   request: function() {
182 |   //     return callRemoteMethod('http.request', arguments);
183 |   //   }
184 |   // };
185 | 
186 |   function normalize(params) {
187 |     for (let key in params) {
188 |       const item = params[key];
189 |       if (/^method:/.test(item)) {
190 |         params[key] = function() {
191 |           return callRemoteMethod(item, arguments);
192 |         };
193 |       } else if (Array.isArray(item) || typeof item === 'object') {
194 |         normalize(item);
195 |       }
196 |     }
197 |     return params;
198 |   }
199 |   script.apply(worker, [worker].concat(normalize(params)));
200 | });


--------------------------------------------------------------------------------
/lib/index.js:
--------------------------------------------------------------------------------
  1 | 'use strict';
  2 | 
  3 | const v8 = require('v8');
  4 | const path = require('path');
  5 | const isPlainObject = require('is-plain-object');
  6 | const WebWorkerWrap = require('bindings')('webworker').WebWorkerWrap;
  7 | 
  8 | const defaultOptions = {
  9 |   timeout: undefined,
 10 |   defines: [],
 11 | };
 12 | 
 13 | const fakeGlobals = {
 14 |   fs: require('fs'),
 15 |   process,
 16 |   setTimeout,
 17 |   setInterval,
 18 |   clearTimeout,
 19 |   clearInterval,
 20 | };
 21 | 
 22 | /**
 23 |  * @class WebWorker
 24 |  */
 25 | class WebWorker {
 26 |   /**
 27 |    * @method constructor
 28 |    * @param {Function|String} script - the path to a worker script or script function directly.
 29 |    */
 30 |   constructor(script, options=defaultOptions) {
 31 |     const root = path.join(__dirname, '../');
 32 |     this._handle = new WebWorkerWrap(root, script, this.onRequest.bind(this));
 33 |     this._refs = {};
 34 |     this._requests = [];
 35 | 
 36 |     // messaging objects
 37 |     this._postMessage = null;
 38 |     this._queuedMessages = [];
 39 | 
 40 |     // events
 41 |     this._onstdout = null;
 42 |     this._onstderr = null;
 43 |     this._onmessage = null;
 44 |     // TODO(Yorkie): current not supported
 45 |     this._onerror = null;
 46 | 
 47 |     // init
 48 |     this._terminateTimer = options.timeout ? 
 49 |       setTimeout(this.terminate.bind(this), options.timeout) : null;
 50 |     const defines = (options.defines || []).map((val, idx) => {
 51 |       return this.normalize(`defines${idx}`, val);
 52 |     });
 53 |     this._handle.start(v8.serialize(defines).buffer);
 54 |   }
 55 |   /**
 56 |    * @property {Function} onstdout
 57 |    */
 58 |   get onstdout() {
 59 |     return (...args) => {
 60 |       if (typeof this._onstdout === 'function')
 61 |         this._onstdout(Array.from(args).join(' '));
 62 |       else
 63 |         console.info.apply(console, args);
 64 |     };
 65 |   }
 66 |   set onstdout(val) {
 67 |     this._onstdout = val;
 68 |   }
 69 |   /**
 70 |    * @property {Function} onstderr
 71 |    */
 72 |   get onstderr() {
 73 |     return (...args) => {
 74 |       if (typeof this._onstderr === 'function')
 75 |         this._onstderr(Array.from(args).join(' '));
 76 |       else
 77 |         console.error.apply(console, args);
 78 |     };
 79 |   }
 80 |   set onstderr(val) {
 81 |     this._onstderr = val;
 82 |   }
 83 |   /**
 84 |    * @property {Function} onmessage
 85 |    */
 86 |   get onmessage() {
 87 |     return (...args) => {
 88 |       if (typeof this._onmessage === 'function')
 89 |         this._onmessage.apply(this, args);
 90 |     };
 91 |   }
 92 |   set onmessage(val) {
 93 |     this._onmessage = val;
 94 |   }
 95 |   /**
 96 |    * @property {Function} onerror
 97 |    */
 98 |   set onerror(val) {
 99 |     this._onerror = val;
100 |   }
101 |   /**
102 |    * @property {Boolean} destroyed
103 |    */
104 |   get destroyed() {
105 |     return this._handle.destroyed;
106 |   }
107 |   /**
108 |    * @method postMessage
109 |    * @param {Object} msg - message to pass
110 |    */
111 |   postMessage(msg) {
112 |     if (typeof this._postMessage === 'function') {
113 |       this._postMessage(msg);
114 |     } else {
115 |       this._queuedMessages.push(msg);
116 |     }
117 |   }
118 |   /**
119 |    * @method terminate
120 |    */
121 |   terminate() {
122 |     clearTimeout(this._terminateTimer);
123 |     // clear the requests resouce...
124 |     this._requests.forEach((request) => {
125 |       if (request.host === fakeGlobals) {
126 |         if (request.name === 'setTimeout')
127 |           clearTimeout(request.result);
128 |         else if (request.name === 'setInterval')
129 |           clearInterval(request.result);
130 |       }
131 |     });
132 |     if (typeof this.onterminating === 'function') {
133 |       this.onterminating(this._requests);
134 |     }
135 |     this._handle.terminate();
136 |     setTimeout(() => {
137 |       this._handle.forceTerminate();
138 |     }, 500);
139 |   }
140 |   /**
141 |    * @method send
142 |    * @param {String} id
143 |    * @param {Array} args
144 |    */
145 |   send(id, args) {
146 |     this._handle.send(id, 
147 |       v8.serialize(args.map((val) => {
148 |         return this.normalize(id, val);
149 |       })).buffer
150 |     );
151 |   }
152 |   /**
153 |    * @method prePostMessage
154 |    * @param {Function} sender
155 |    */
156 |   prePostMessage(sender) {
157 |     for (let i = 0; i < this._queuedMessages.length; i++) {
158 |       sender.call(this, this._queuedMessages[i]);
159 |     }
160 |     this._queuedMessages.length = 0;
161 |     this._postMessage = sender.bind(this);
162 |   }
163 |   /**
164 |    * @method normalize
165 |    * @param {String} id
166 |    * @param {Object} data
167 |    * @returns the normalized object.
168 |    */
169 |   normalize(id, data) {
170 |     // FIXME(Yorkie): for buffer, we will use SharedArrayBuffer to share 
171 |     // buffer between stacks.
172 |     if (Buffer.isBuffer(data)) {
173 |       return data.buffer;
174 |     }
175 | 
176 |     if (data instanceof Error) {
177 |       return {
178 |         type: 'Error',
179 |         message: data.message,
180 |         stack: data.stack,
181 |       };
182 |     }
183 | 
184 |     if (typeof data === 'function') {
185 |       const key = `method:${id}#root`;
186 |       this._refs[key] = data;
187 |       return key;
188 |     }
189 | 
190 | 
191 |     // FIXME(Yorkie): if data is not a plain object, return data...
192 |     if (!isPlainObject(data)) {
193 |       return data;
194 |     }
195 | 
196 |     // start common normalizing progress.
197 |     const normalized = {};
198 |     assign.call(this, normalized, data);
199 | 
200 |     function assign(host, val) {
201 |       for (let name in val) {
202 |         let prop = val[name];
203 |         if (typeof prop === 'function') {
204 |           const key = `method:${id}#${name}`;
205 |           host[name] = key;
206 |           this._refs[key] = val;
207 |         } else if (Array.isArray(prop)) {
208 |           host[name] = [];
209 |           assign.call(this, host[name], prop);
210 |         } else if (isPlainObject(prop)) {
211 |           host[name] = {};
212 |           assign.call(this, host[name], prop);
213 |         } else if (typeof prop !== 'object') {
214 |           host[name] = prop;
215 |         }
216 |       }
217 |     }
218 |     return normalized;
219 |   }
220 |   /**
221 |    * @method onRequest
222 |    * @param {String} name
223 |    * @param {Array} args
224 |    */
225 |   onRequest(name, args) {
226 |     args = args.map((arg) => {
227 |       if (/callback:/.test(arg)) {
228 |         const id = arg.replace(/^callback:/, '');
229 |         return (...args) => this.send(id, args);
230 |       } else if (/^error:/.test(arg)) {
231 |         try {
232 |           const data = JSON.parse(arg.replace(/^error:/, ''));
233 |           const err = new Error(data.message);
234 |           err.stack = data.stack;
235 |           return err;
236 |         } catch (err) {
237 |           return arg;
238 |         }
239 |       } else {
240 |         return arg;
241 |       }
242 |     });
243 |     let host = fakeGlobals;
244 |     let fname;
245 | 
246 |     if (this._refs[name]) {
247 |       host = this._refs[name];
248 |       // FIXME(Yorkie): for direct function.
249 |       if (typeof host === 'function') {
250 |         host = this._refs;
251 |         fname = name;
252 |       } else {
253 |         fname = name.replace(/^method:[a-z0-9]*#/i, '');
254 |       }
255 |     } else {
256 |       let mpath = name.split('.');
257 |       if (mpath[0] === '$') {
258 |         host = this;
259 |         mpath = mpath.slice(1);
260 |       }
261 |       if (mpath.length === 1) {
262 |         fname = mpath[0];
263 |       } else {
264 |         while (true) {
265 |           const symbol = mpath.shift();
266 |           host = host[symbol];
267 |           if (mpath.length === 1) {
268 |             fname = mpath[0];
269 |             break;
270 |           }
271 |         }
272 |       }
273 |     }
274 | 
275 |     if (typeof host[fname] === 'function') {
276 |       let result = host[fname].apply(host, args);
277 |       this._requests.push({
278 |         name: fname,
279 |         host,
280 |         result,
281 |       });
282 |       try {
283 |         return v8.serialize(result).buffer;
284 |       } catch (err) {
285 |         return v8.serialize({}).buffer;
286 |       }
287 |     } else {
288 |       throw new Error(`${name} is not a function`);
289 |     }
290 |   }
291 | }
292 | 
293 | exports.WebWorker = WebWorker;


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--------------------------------------------------------------------------------
/src/WebWorkerWrap.cc:
--------------------------------------------------------------------------------
  1 | #include "src/WebWorkerWrap.h"
  2 | #include <uv.h>
  3 | #include <unistd.h>
  4 | #include <pthread.h>
  5 | #include <iostream>
  6 | #include <fstream>
  7 | #include <sstream>
  8 | 
  9 | using namespace v8;
 10 | using namespace node;
 11 | using namespace std;
 12 | 
 13 | #define SKIP_RESULE(body) \
 14 |   MaybeLocal<Value> res = body; \
 15 |   (void)res;
 16 | 
 17 | void WebWorkerWrap::Writeln(const FunctionCallbackInfo<Value>& info) {
 18 |   Isolate* isolate = info.GetIsolate();
 19 |   {
 20 |     HandleScope scope(isolate);
 21 |     char* text = strdup(*String::Utf8Value(info[0]));
 22 |     fprintf(stdout, "%s\n", text);
 23 |     free(text);
 24 |   }
 25 | }
 26 | 
 27 | void WebWorkerWrap::Compile(const FunctionCallbackInfo<Value>& info) {
 28 |   Isolate* isolate = info.GetIsolate();
 29 |   {
 30 |     HandleScope scope(isolate);
 31 |     WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(isolate->GetData(0));
 32 | 
 33 |     char* pathname = strdup(*String::Utf8Value(info[0]));
 34 |     std::ifstream ifs(pathname);
 35 |     if (!ifs) {
 36 |       info.GetReturnValue().Set(Boolean::New(isolate, false));
 37 |       return;
 38 |     }
 39 |     std::string source(
 40 |       (std::istreambuf_iterator<char>(ifs)), std::istreambuf_iterator<char>());
 41 | 
 42 |     std::stringstream contents;
 43 |     contents << "(function(exports, module, require, __dirname){" << source << "})";
 44 |     Local<Function> compiled = worker->Compile(pathname, contents.str().c_str());
 45 |     info.GetReturnValue().Set(compiled);
 46 |     free(pathname);
 47 |   }
 48 | }
 49 | 
 50 | void WebWorkerWrap::CheckPoint(const FunctionCallbackInfo<Value>& info) {
 51 |   pthread_testcancel();
 52 | }
 53 | 
 54 | void WebWorkerWrap::DefineRemoteMethod(const FunctionCallbackInfo<Value>& info) {
 55 |   Isolate* isolate = info.GetIsolate();
 56 |   {
 57 |     HandleScope scope(isolate);
 58 |     Local<Context> context = isolate->GetCurrentContext();
 59 |     WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(isolate->GetData(0));
 60 | 
 61 |     MaybeLocal<String> serializedParams = JSON::Stringify(context, info[1]->ToObject());
 62 |     worker->request_name = strdup(*String::Utf8Value(info[0]));
 63 |     worker->request_args = strdup(*String::Utf8Value(serializedParams.ToLocalChecked()));
 64 |     uv_async_send(&worker->master_handle);
 65 |     uv_sem_wait(&worker->request_locker);
 66 | 
 67 |     {
 68 |       // deserialize the returned string
 69 |       ValueDeserializer* deserializer = new ValueDeserializer(isolate,
 70 |         (const uint8_t*)worker->request_returns.Data(), worker->request_returns.ByteLength());
 71 |       Maybe<bool> r = deserializer->ReadHeader(context);
 72 |       if (!r.FromJust()) {
 73 |         Nan::ThrowError("Unknown Header Parsing.");
 74 |         return;
 75 |       }
 76 |       Local<Value> val = deserializer->ReadValue(context).ToLocalChecked();
 77 |       info.GetReturnValue().Set(val);
 78 |     }
 79 | 
 80 |     // frees the request objects
 81 |     if (worker->request_name) {
 82 |       delete worker->request_name;
 83 |       worker->request_name = NULL;
 84 |     }
 85 |     if (worker->request_args) {
 86 |       delete worker->request_args;
 87 |       worker->request_args = NULL;
 88 |     }
 89 |   }
 90 | }
 91 | 
 92 | void WebWorkerWrap::QueueCallback(const FunctionCallbackInfo<Value>& info) {
 93 |   Isolate* isolate = info.GetIsolate();
 94 |   {
 95 |     HandleScope scope(isolate);
 96 |     WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(isolate->GetData(0));
 97 |     char* id = strdup(*String::Utf8Value(info[0]));
 98 |     worker->callbacks_[id].Reset(isolate, Local<Function>::Cast(info[1]));
 99 |     free(id);
100 |   }
101 | }
102 | 
103 | Local<Function> WebWorkerWrap::Compile(const char* name_, const char* source_) {
104 |   Isolate* isolate = worker_isolate;
105 |   EscapableHandleScope scope(isolate);
106 |   TryCatch try_catch(isolate);
107 | 
108 |   Local<Context> context = isolate->GetCurrentContext();
109 |   MaybeLocal<String> name = Nan::New(name_);
110 |   MaybeLocal<String> source = Nan::New(source_);
111 |   ScriptOrigin origin(name.ToLocalChecked());
112 |   MaybeLocal<Script> script = Script::Compile(context, source.ToLocalChecked(), &origin);
113 |   if (script.IsEmpty()) {
114 |     if (try_catch.HasCaught())
115 |       WebWorkerWrap::ReportError(&try_catch);
116 |     exit(0);
117 |   }
118 |   Local<Value> result = script.ToLocalChecked()->Run();
119 |   if (result.IsEmpty()) {
120 |     if (try_catch.HasCaught())
121 |       WebWorkerWrap::ReportError(&try_catch);
122 |     exit(0);
123 |   }
124 |   return scope.Escape(Local<Function>::Cast(result));
125 | }
126 | 
127 | Local<Function> WebWorkerWrap::GetBootstrapScript() {
128 |   stringstream scriptAbsPath;
129 |   scriptAbsPath << root << "/src/bootstrap_worker.js";
130 |   std::ifstream ifs(scriptAbsPath.str());
131 |   std::string script_source(
132 |     (std::istreambuf_iterator<char>(ifs)), 
133 |     std::istreambuf_iterator<char>());
134 |   return Compile("bootstrap_worker.js", script_source.c_str());
135 | }
136 | 
137 | void WebWorkerWrap::ReportError(TryCatch* try_catch) {
138 |   Isolate* isolate = v8::Isolate::GetCurrent();
139 |   EscapableHandleScope scope(isolate);
140 |   {
141 |     Local<String> stack = Local<String>::Cast(try_catch->StackTrace());
142 |     fprintf(stderr, "%s\n", *String::Utf8Value(stack));
143 |   }
144 | }
145 | 
146 | void WebWorkerWrap::CleanupThread(void* data) {
147 |   WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(data);
148 |   if (worker->worker_isolate_exited == 0) {
149 |     worker->worker_isolate->Exit();
150 |   }
151 |   worker->worker_isolate->Dispose();
152 |   worker->Deinit();
153 | }
154 | 
155 | void WebWorkerWrap::CreateTask(void* data) {
156 |   pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
157 |   pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
158 |   pthread_testcancel();
159 | 
160 |   WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(data);
161 |   ArrayBuffer::Allocator* allocator = ArrayBuffer::Allocator::NewDefaultAllocator();
162 |   Isolate::CreateParams create_params;
163 |   create_params.array_buffer_allocator = allocator;
164 | 
165 |   // TODO(Yorkie): Isolate::New takes long time, the isolations 
166 |   // pool is required for performance.
167 |   Isolate* isolate = Isolate::New(create_params);
168 |   pthread_cleanup_push(WebWorkerWrap::CleanupThread, worker);
169 | 
170 |   worker->InitThread(isolate);
171 |   {
172 |     Locker locker(isolate);
173 |     isolate->SetData(0, (void*)worker);
174 | 
175 |     Isolate::Scope isolate_scope(isolate);
176 |     HandleScope handle_scope(isolate);
177 |     Local<Context> context = Context::New(isolate);
178 |     Context::Scope context_scope(context);
179 |     worker->worker_context = context;
180 |     worker->worker_context->Enter();
181 | 
182 |     TryCatch try_catch(isolate);
183 |     try_catch.SetVerbose(false);
184 | 
185 |     Local<Function> bootstrap = worker->GetBootstrapScript();
186 |     Local<Function> script = worker->Compile("WebWorkerProgress.js", worker->source);
187 | 
188 |     Local<Object> jsworker = Object::New(isolate);
189 |     NODE_SET_METHOD(jsworker, "defineRemoteMethod", DefineRemoteMethod);
190 |     NODE_SET_METHOD(jsworker, "queueCallback", QueueCallback);
191 | 
192 |     Local<Object> global = context->Global();
193 |     NODE_SET_METHOD(global, "$writeln", WebWorkerWrap::Writeln);
194 |     NODE_SET_METHOD(global, "$compile", WebWorkerWrap::Compile);
195 |     NODE_SET_METHOD(global, "$checkpoint", WebWorkerWrap::CheckPoint);
196 | 
197 |     // call bootstrap_worker.js
198 |     {
199 |       Local<Value> argv[5];
200 |       argv[0] = jsworker;
201 |       argv[1] = global;
202 |       argv[2] = script;
203 | 
204 |       ValueDeserializer* deserializer = new ValueDeserializer(isolate,
205 |         (const uint8_t*)worker->script_args.Data(), worker->script_args.ByteLength());
206 |       Maybe<bool> r = deserializer->ReadHeader(context);
207 |       if (!r.FromJust()) {
208 |         Nan::ThrowError("Unknown Header Parsing");
209 |       } else {
210 | 
211 |         argv[3] = deserializer->ReadValue(context).ToLocalChecked();
212 |         argv[4] = Nan::New(worker->root).ToLocalChecked();
213 |         SKIP_RESULE(bootstrap->Call(context, jsworker, 5, argv));
214 |       }
215 |     }
216 | 
217 |     if (try_catch.HasCaught()) {
218 |       WebWorkerWrap::ReportError(&try_catch);
219 |     } else {
220 |       // check if any callbacks.
221 |       while (true) {
222 |         uv_sem_wait(&worker->worker_locker);
223 |         if (worker->should_terminate)
224 |           break;
225 |         Local<Function> cb = Local<Function>::New(isolate, worker->callbacks_[worker->callback_id]);
226 |         worker->WorkerCallback(cb);
227 | 
228 |         // check if has error should be reported.
229 |         if (try_catch.HasCaught()) {
230 |           WebWorkerWrap::ReportError(&try_catch);
231 |           break;
232 |         }
233 |       }
234 |     }
235 |     worker->worker_context->Exit();
236 |     worker->worker_isolate_exited = 1;
237 |   }
238 |   pthread_cleanup_pop(1);
239 | }
240 | 
241 | void WebWorkerWrap::InitThread(Isolate* isolate) {
242 |   worker_isolate = isolate;
243 |   uv_sem_init(&worker_locker, 0);
244 |   uv_sem_init(&request_locker, 0);
245 | }
246 | 
247 | void WebWorkerWrap::Deinit() {
248 |   if (destroyed_) return;
249 |   destroyed_ = true;
250 | 
251 |   uv_close((uv_handle_t*)&master_handle, NULL);
252 |   uv_sem_destroy(&worker_locker);
253 |   uv_sem_destroy(&request_locker);
254 |   onrequest_.Reset();
255 |   if (root != NULL)
256 |     delete root;
257 |   if (source != NULL)
258 |     delete source;
259 |   if (callback_id != NULL)
260 |     delete callback_id;
261 |   if (request_name != NULL)
262 |     delete request_name;
263 |   if (request_args != NULL)
264 |     delete request_args;
265 | }
266 | 
267 | void WebWorkerWrap::MasterCallback(uv_async_t* handle) {
268 |   WebWorkerWrap* worker = reinterpret_cast<WebWorkerWrap*>(handle->data);
269 |   Nan::HandleScope scope;
270 | 
271 |   Isolate* isolate = Isolate::GetCurrent();
272 |   Local<Context> context = isolate->GetCurrentContext();
273 |   Local<Function> onrequest = Local<Function>::New(isolate, worker->onrequest_);
274 | 
275 |   Local<Value> args[2];
276 |   args[0] = Nan::New(worker->request_name).ToLocalChecked();
277 |   args[1] = JSON::Parse(context, Nan::New(worker->request_args).ToLocalChecked()).ToLocalChecked();
278 | 
279 |   Local<Value> res = onrequest->Call(worker->handle(), 2, args);
280 |   worker->request_returns = Local<SharedArrayBuffer>::Cast(res)->Externalize();
281 |   uv_sem_post(&worker->request_locker);
282 | }
283 | 
284 | void WebWorkerWrap::WorkerCallback(Local<Function> cb) {
285 |   Isolate* isolate = v8::Isolate::GetCurrent();
286 |   Local<Context> context = isolate->GetCurrentContext();
287 |   {
288 |     HandleScope scope(isolate);
289 |     Local<Value> argv[1];
290 | 
291 |     ValueDeserializer* deserializer = new ValueDeserializer(isolate, 
292 |       (const uint8_t*)callback_data.Data(), callback_data.ByteLength());
293 |     Maybe<bool> r = deserializer->ReadHeader(context);
294 |     if (!r.FromJust()) {
295 |       Nan::ThrowError("Unknown Header Parsing");
296 |     } else {
297 |       argv[0] = deserializer->ReadValue(context).ToLocalChecked();
298 |       SKIP_RESULE(cb->Call(context, context->Global(), 1, argv));
299 |     }
300 |   }
301 | }
302 | 
303 | WebWorkerWrap::WebWorkerWrap(const char* source_) {
304 |   source = strdup(source_);
305 |   master_handle.data = this;
306 |   uv_async_init(uv_default_loop(), &master_handle, &WebWorkerWrap::MasterCallback);
307 | }
308 | 
309 | WebWorkerWrap::~WebWorkerWrap() {
310 |   Deinit();
311 | }
312 | 
313 | NAN_MODULE_INIT(WebWorkerWrap::Init) {
314 |   Local<FunctionTemplate> tpl = Nan::New<FunctionTemplate>(New);
315 |   tpl->SetClassName(Nan::New("WebWorkerWrap").ToLocalChecked());
316 |   tpl->InstanceTemplate()->SetInternalFieldCount(1);
317 | 
318 |   Nan::SetPrototypeMethod(tpl, "send", Send);
319 |   Nan::SetPrototypeMethod(tpl, "start", Start);
320 |   Nan::SetPrototypeMethod(tpl, "terminate", Terminate);
321 |   Nan::SetPrototypeMethod(tpl, "forceTerminate", ForceTerminate);
322 |   Nan::SetAccessor(tpl->InstanceTemplate(), 
323 |     Nan::New<String>("destroyed").ToLocalChecked(), GetDestroyed);
324 | 
325 |   Local<Function> func = Nan::GetFunction(tpl).ToLocalChecked();
326 |   Nan::Set(target, Nan::New("WebWorkerWrap").ToLocalChecked(), func);
327 | }
328 | 
329 | NAN_METHOD(WebWorkerWrap::New) {
330 |   Local<String> root = info[0].As<String>();
331 |   Local<Function> script = Local<Function>::Cast(info[1]);
332 |   Local<Function> onrequest = Local<Function>::Cast(info[2]);
333 |   script->SetName(Nan::New<String>("WebWorkerProgress").ToLocalChecked());
334 |   {
335 |     std::string f_src(*Nan::Utf8String(script->ToString()));
336 |     std::string f_full = "(" + f_src + ")";
337 |     const char* source = f_full.c_str();
338 | 
339 |     WebWorkerWrap* worker = new WebWorkerWrap(source);
340 |     worker->root = strdup(*Nan::Utf8String(root));
341 |     worker->onrequest_.Reset(info.GetIsolate(), onrequest);
342 |     worker->Wrap(info.This());
343 |     // FIXME(Yorkie): by scoping, deleting std::string object automatically.
344 |   }
345 | }
346 | 
347 | NAN_METHOD(WebWorkerWrap::Send) {
348 |   WebWorkerWrap* worker = Nan::ObjectWrap::Unwrap<WebWorkerWrap>(info.This());
349 |   if (worker->destroyed_)
350 |     return Nan::ThrowError("worker is destroyed");
351 | 
352 |   // FIXME(Yorkie): free id and data before malloc new blocks
353 |   if (worker->callback_id)
354 |     free(worker->callback_id);
355 |   if (worker->callback_data.ByteLength() > 0)
356 |     free(worker->callback_data.Data());
357 | 
358 |   worker->callback_id = strdup(*String::Utf8Value(info[0]));
359 |   worker->callback_data = Local<SharedArrayBuffer>::Cast(info[1])->Externalize();
360 |   uv_sem_post(&worker->worker_locker);
361 | }
362 | 
363 | NAN_METHOD(WebWorkerWrap::Start) {
364 |   WebWorkerWrap* worker = Nan::ObjectWrap::Unwrap<WebWorkerWrap>(info.This());
365 |   worker->script_args = Local<SharedArrayBuffer>::Cast(info[0])->Externalize();
366 |   uv_thread_create(&worker->thread, &WebWorkerWrap::CreateTask, (void*)worker);
367 | }
368 | 
369 | NAN_METHOD(WebWorkerWrap::Terminate) {
370 |   WebWorkerWrap* worker = Nan::ObjectWrap::Unwrap<WebWorkerWrap>(info.This());
371 |   worker->should_terminate = 1;
372 |   uv_sem_post(&worker->worker_locker);
373 | }
374 | 
375 | NAN_METHOD(WebWorkerWrap::ForceTerminate) {
376 |   WebWorkerWrap* worker = Nan::ObjectWrap::Unwrap<WebWorkerWrap>(info.This());
377 |   if (worker->destroyed_)
378 |     return;
379 |   pthread_cancel(worker->thread);
380 | }
381 | 
382 | NAN_PROPERTY_GETTER(WebWorkerWrap::GetDestroyed) {
383 |   WebWorkerWrap* worker = Nan::ObjectWrap::Unwrap<WebWorkerWrap>(info.This());
384 |   if (worker->destroyed_) {
385 |     info.GetReturnValue().Set(Nan::True());
386 |   } else {
387 |     info.GetReturnValue().Set(Nan::False());
388 |   }
389 | }
390 | 
391 | void InitModule(Handle<Object> target) {
392 |   WebWorkerWrap::Init(target);
393 | }
394 | 
395 | NODE_MODULE(WebWorker, InitModule);
396 | 


--------------------------------------------------------------------------------
/src/internal/errors.js:
--------------------------------------------------------------------------------
  1 | /* eslint-enable alphabetize-errors */
  2 | 
  3 | 'use strict';
  4 | 
  5 | // The whole point behind this internal module is to allow Node.js to no
  6 | // longer be forced to treat every error message change as a semver-major
  7 | // change. The NodeError classes here all expose a `code` property whose
  8 | // value statically and permanently identifies the error. While the error
  9 | // message may change, the code should not.
 10 | 
 11 | const kCode = Symbol('code');
 12 | const messages = new Map();
 13 | 
 14 | // Lazily loaded
 15 | var assert = null;
 16 | var util = null;
 17 | 
 18 | function makeNodeError(Base) {
 19 |   return class NodeError extends Base {
 20 |     constructor(key, ...args) {
 21 |       super(message(key, args));
 22 |       this[kCode] = key;
 23 |     }
 24 | 
 25 |     get name() {
 26 |       return `${super.name} [${this[kCode]}]`;
 27 |     }
 28 | 
 29 |     get code() {
 30 |       return this[kCode];
 31 |     }
 32 |   };
 33 | }
 34 | 
 35 | class AssertionError extends Error {
 36 |   constructor(options) {
 37 |     if (typeof options !== 'object' || options === null) {
 38 |       throw new exports.TypeError('ERR_INVALID_ARG_TYPE', 'options', 'object');
 39 |     }
 40 |     if (options.message) {
 41 |       super(options.message);
 42 |     } else {
 43 |       if (util === null) util = require('util');
 44 |       super(`${util.inspect(options.actual).slice(0, 128)} ` +
 45 |         `${options.operator} ${util.inspect(options.expected).slice(0, 128)}`);
 46 |     }
 47 | 
 48 |     this.generatedMessage = !options.message;
 49 |     this.name = 'AssertionError [ERR_ASSERTION]';
 50 |     this.code = 'ERR_ASSERTION';
 51 |     this.actual = options.actual;
 52 |     this.expected = options.expected;
 53 |     this.operator = options.operator;
 54 |     Error.captureStackTrace(this, options.stackStartFunction);
 55 |   }
 56 | }
 57 | 
 58 | function message(key, args) {
 59 |   if (assert === null) assert = require('assert');
 60 |   assert.strictEqual(typeof key, 'string');
 61 |   const msg = messages.get(key);
 62 |   assert(msg, `An invalid error message key was used: ${key}.`);
 63 |   let fmt;
 64 |   if (typeof msg === 'function') {
 65 |     fmt = msg;
 66 |   } else {
 67 |     if (util === null) util = require('util');
 68 |     fmt = util.format;
 69 |     if (args === undefined || args.length === 0)
 70 |       return msg;
 71 |     args.unshift(msg);
 72 |   }
 73 |   return String(fmt.apply(null, args));
 74 | }
 75 | 
 76 | // Utility function for registering the error codes. Only used here. Exported
 77 | // *only* to allow for testing.
 78 | function E(sym, val) {
 79 |   messages.set(sym, typeof val === 'function' ? val : String(val));
 80 | }
 81 | 
 82 | module.exports = exports = {
 83 |   message,
 84 |   Error: makeNodeError(Error),
 85 |   TypeError: makeNodeError(TypeError),
 86 |   RangeError: makeNodeError(RangeError),
 87 |   AssertionError,
 88 |   E // This is exported only to facilitate testing.
 89 | };
 90 | 
 91 | // To declare an error message, use the E(sym, val) function above. The sym
 92 | // must be an upper case string. The val can be either a function or a string.
 93 | // The return value of the function must be a string.
 94 | // Examples:
 95 | // E('EXAMPLE_KEY1', 'This is the error value');
 96 | // E('EXAMPLE_KEY2', (a, b) => return `${a} ${b}`);
 97 | //
 98 | // Once an error code has been assigned, the code itself MUST NOT change and
 99 | // any given error code must never be reused to identify a different error.
100 | //
101 | // Any error code added here should also be added to the documentation
102 | //
103 | // Note: Please try to keep these in alphabetical order
104 | E('ERR_ARG_NOT_ITERABLE', '%s must be iterable');
105 | E('ERR_ASSERTION', '%s');
106 | E('ERR_ASYNC_CALLBACK', (name) => `${name} must be a function`);
107 | E('ERR_ASYNC_TYPE', (s) => `Invalid name for async "type": ${s}`);
108 | E('ERR_BUFFER_OUT_OF_BOUNDS', bufferOutOfBounds);
109 | E('ERR_CHILD_CLOSED_BEFORE_REPLY', 'Child closed before reply received');
110 | E('ERR_CONSOLE_WRITABLE_STREAM',
111 |   'Console expects a writable stream instance for %s');
112 | E('ERR_CPU_USAGE', 'Unable to obtain cpu usage %s');
113 | E('ERR_DNS_SET_SERVERS_FAILED', (err, servers) =>
114 |   `c-ares failed to set servers: "${err}" [${servers}]`);
115 | E('ERR_ENCODING_INVALID_ENCODED_DATA',
116 |   (enc) => `The encoded data was not valid for encoding ${enc}`);
117 | E('ERR_ENCODING_NOT_SUPPORTED',
118 |   (enc) => `The "${enc}" encoding is not supported`);
119 | E('ERR_FALSY_VALUE_REJECTION', 'Promise was rejected with falsy value');
120 | E('ERR_HTTP_HEADERS_SENT',
121 |   'Cannot %s headers after they are sent to the client');
122 | E('ERR_HTTP_INVALID_CHAR', 'Invalid character in statusMessage.');
123 | E('ERR_HTTP_INVALID_STATUS_CODE',
124 |   (originalStatusCode) => `Invalid status code: ${originalStatusCode}`);
125 | E('ERR_HTTP_TRAILER_INVALID',
126 |   'Trailers are invalid with this transfer encoding');
127 | E('ERR_HTTP2_CONNECT_AUTHORITY',
128 |   ':authority header is required for CONNECT requests');
129 | E('ERR_HTTP2_CONNECT_PATH',
130 |   'The :path header is forbidden for CONNECT requests');
131 | E('ERR_HTTP2_CONNECT_SCHEME',
132 |   'The :scheme header is forbidden for CONNECT requests');
133 | E('ERR_HTTP2_FRAME_ERROR',
134 |   (type, code, id) => {
135 |     let msg = `Error sending frame type ${type}`;
136 |     if (id !== undefined)
137 |       msg += ` for stream ${id}`;
138 |     msg += ` with code ${code}`;
139 |     return msg;
140 |   });
141 | E('ERR_HTTP2_HEADER_REQUIRED',
142 |   (name) => `The ${name} header is required`);
143 | E('ERR_HTTP2_HEADER_SINGLE_VALUE',
144 |   (name) => `Header field "${name}" must have only a single value`);
145 | E('ERR_HTTP2_HEADERS_AFTER_RESPOND',
146 |   'Cannot specify additional headers after response initiated');
147 | E('ERR_HTTP2_HEADERS_OBJECT', 'Headers must be an object');
148 | E('ERR_HTTP2_HEADERS_SENT', 'Response has already been initiated.');
149 | E('ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND',
150 |   'Cannot send informational headers after the HTTP message has been sent');
151 | E('ERR_HTTP2_INFO_STATUS_NOT_ALLOWED',
152 |   'Informational status codes cannot be used');
153 | E('ERR_HTTP2_INVALID_CONNECTION_HEADERS',
154 |   'HTTP/1 Connection specific headers are forbidden');
155 | E('ERR_HTTP2_INVALID_HEADER_VALUE', 'Value must not be undefined or null');
156 | E('ERR_HTTP2_INVALID_INFO_STATUS',
157 |   (code) => `Invalid informational status code: ${code}`);
158 | E('ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH',
159 |   'Packed settings length must be a multiple of six');
160 | E('ERR_HTTP2_INVALID_PSEUDOHEADER',
161 |   (name) => `"${name}" is an invalid pseudoheader or is used incorrectly`);
162 | E('ERR_HTTP2_INVALID_SESSION', 'The session has been destroyed');
163 | E('ERR_HTTP2_INVALID_SETTING_VALUE',
164 |   (name, value) => `Invalid value for setting "${name}": ${value}`);
165 | E('ERR_HTTP2_INVALID_STREAM', 'The stream has been destroyed');
166 | E('ERR_HTTP2_MAX_PENDING_SETTINGS_ACK',
167 |   (max) => `Maximum number of pending settings acknowledgements (${max})`);
168 | E('ERR_HTTP2_OUT_OF_STREAMS',
169 |   'No stream ID is available because maximum stream ID has been reached');
170 | E('ERR_HTTP2_PAYLOAD_FORBIDDEN',
171 |   (code) => `Responses with ${code} status must not have a payload`);
172 | E('ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED', 'Cannot set HTTP/2 pseudo-headers');
173 | E('ERR_HTTP2_PUSH_DISABLED', 'HTTP/2 client has disabled push streams');
174 | E('ERR_HTTP2_SEND_FILE', 'Only regular files can be sent');
175 | E('ERR_HTTP2_SOCKET_BOUND',
176 |   'The socket is already bound to an Http2Session');
177 | E('ERR_HTTP2_STATUS_101',
178 |   'HTTP status code 101 (Switching Protocols) is forbidden in HTTP/2');
179 | E('ERR_HTTP2_STATUS_INVALID',
180 |   (code) => `Invalid status code: ${code}`);
181 | E('ERR_HTTP2_STREAM_CLOSED', 'The stream is already closed');
182 | E('ERR_HTTP2_STREAM_ERROR',
183 |   (code) => `Stream closed with error code ${code}`);
184 | E('ERR_HTTP2_STREAM_SELF_DEPENDENCY', 'A stream cannot depend on itself');
185 | E('ERR_HTTP2_UNSUPPORTED_PROTOCOL',
186 |   (protocol) => `protocol "${protocol}" is unsupported.`);
187 | E('ERR_INDEX_OUT_OF_RANGE', 'Index out of range');
188 | E('ERR_INVALID_ARG_TYPE', invalidArgType);
189 | E('ERR_INVALID_ARRAY_LENGTH',
190 |   (name, len, actual) => {
191 |     assert.strictEqual(typeof actual, 'number');
192 |     return `The array "${name}" (length ${actual}) must be of length ${len}.`;
193 |   });
194 | E('ERR_INVALID_ASYNC_ID', (type, id) => `Invalid ${type} value: ${id}`);
195 | E('ERR_INVALID_BUFFER_SIZE', 'Buffer size must be a multiple of %s');
196 | E('ERR_INVALID_CALLBACK', 'Callback must be a function');
197 | E('ERR_INVALID_CHAR', invalidChar);
198 | E('ERR_INVALID_CURSOR_POS',
199 |   'Cannot set cursor row without setting its column');
200 | E('ERR_INVALID_DOMAIN_NAME', 'Unable to determine the domain name');
201 | E('ERR_INVALID_FD', '"fd" must be a positive integer: %s');
202 | E('ERR_INVALID_FILE_URL_HOST',
203 |   'File URL host must be "localhost" or empty on %s');
204 | E('ERR_INVALID_FILE_URL_PATH', 'File URL path %s');
205 | E('ERR_INVALID_HANDLE_TYPE', 'This handle type cannot be sent');
206 | E('ERR_INVALID_HTTP_TOKEN', '%s must be a valid HTTP token ["%s"]');
207 | E('ERR_INVALID_IP_ADDRESS', 'Invalid IP address: %s');
208 | E('ERR_INVALID_OPT_VALUE',
209 |   (name, value) => {
210 |     return `The value "${String(value)}" is invalid for option "${name}"`;
211 |   });
212 | E('ERR_INVALID_OPT_VALUE_ENCODING',
213 |   (value) => `The value "${String(value)}" is invalid for option "encoding"`);
214 | E('ERR_INVALID_PERFORMANCE_MARK', 'The "%s" performance mark has not been set');
215 | E('ERR_INVALID_PROTOCOL', (protocol, expectedProtocol) =>
216 |   `Protocol "${protocol}" not supported. Expected "${expectedProtocol}"`);
217 | E('ERR_INVALID_REPL_EVAL_CONFIG',
218 |   'Cannot specify both "breakEvalOnSigint" and "eval" for REPL');
219 | E('ERR_INVALID_SYNC_FORK_INPUT',
220 |   'Asynchronous forks do not support Buffer, Uint8Array or string input: %s');
221 | E('ERR_INVALID_THIS', 'Value of "this" must be of type %s');
222 | E('ERR_INVALID_TUPLE', '%s must be an iterable %s tuple');
223 | E('ERR_INVALID_URL', 'Invalid URL: %s');
224 | E('ERR_INVALID_URL_SCHEME',
225 |   (expected) => `The URL must be ${oneOf(expected, 'scheme')}`);
226 | E('ERR_IPC_CHANNEL_CLOSED', 'Channel closed');
227 | E('ERR_IPC_DISCONNECTED', 'IPC channel is already disconnected');
228 | E('ERR_IPC_ONE_PIPE', 'Child process can have only one IPC pipe');
229 | E('ERR_IPC_SYNC_FORK', 'IPC cannot be used with synchronous forks');
230 | E('ERR_METHOD_NOT_IMPLEMENTED', 'The %s method is not implemented');
231 | E('ERR_MISSING_ARGS', missingArgs);
232 | E('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');
233 | E('ERR_NAPI_CONS_FUNCTION', 'Constructor must be a function');
234 | E('ERR_NAPI_CONS_PROTOTYPE_OBJECT', 'Constructor.prototype must be an object');
235 | E('ERR_NO_CRYPTO', 'Node.js is not compiled with OpenSSL crypto support');
236 | E('ERR_NO_ICU', '%s is not supported on Node.js compiled without ICU');
237 | E('ERR_NO_LONGER_SUPPORTED', '%s is no longer supported');
238 | E('ERR_OUTOFMEMORY', 'Out of memory');
239 | E('ERR_PARSE_HISTORY_DATA', 'Could not parse history data in %s');
240 | E('ERR_SERVER_ALREADY_LISTEN',
241 |   'Listen method has been called more than once without closing.');
242 | E('ERR_SOCKET_ALREADY_BOUND', 'Socket is already bound');
243 | E('ERR_SOCKET_BAD_PORT', 'Port should be > 0 and < 65536');
244 | E('ERR_SOCKET_BAD_TYPE',
245 |   'Bad socket type specified. Valid types are: udp4, udp6');
246 | E('ERR_SOCKET_CANNOT_SEND', 'Unable to send data');
247 | E('ERR_SOCKET_CLOSED', 'Socket is closed');
248 | E('ERR_SOCKET_DGRAM_NOT_RUNNING', 'Not running');
249 | E('ERR_STDERR_CLOSE', 'process.stderr cannot be closed');
250 | E('ERR_STDOUT_CLOSE', 'process.stdout cannot be closed');
251 | E('ERR_STREAM_WRAP', 'Stream has StringDecoder set or is in objectMode');
252 | E('ERR_TLS_CERT_ALTNAME_INVALID',
253 |   'Hostname/IP does not match certificate\'s altnames: %s');
254 | E('ERR_TLS_DH_PARAM_SIZE', (size) =>
255 |   `DH parameter size ${size} is less than 2048`);
256 | E('ERR_TLS_HANDSHAKE_TIMEOUT', 'TLS handshake timeout');
257 | E('ERR_TLS_RENEGOTIATION_FAILED', 'Failed to renegotiate');
258 | E('ERR_TLS_REQUIRED_SERVER_NAME',
259 |   '"servername" is required parameter for Server.addContext');
260 | E('ERR_TLS_SESSION_ATTACK', 'TSL session renegotiation attack detected');
261 | E('ERR_TRANSFORM_ALREADY_TRANSFORMING',
262 |   'Calling transform done when still transforming');
263 | E('ERR_TRANSFORM_WITH_LENGTH_0',
264 |   'Calling transform done when writableState.length != 0');
265 | E('ERR_UNESCAPED_CHARACTERS',
266 |   (name) => `${name} contains unescaped characters`);
267 | E('ERR_UNKNOWN_ENCODING', 'Unknown encoding: %s');
268 | E('ERR_UNKNOWN_SIGNAL', 'Unknown signal: %s');
269 | E('ERR_UNKNOWN_STDIN_TYPE', 'Unknown stdin file type');
270 | E('ERR_UNKNOWN_STREAM_TYPE', 'Unknown stream file type');
271 | E('ERR_VALUE_OUT_OF_RANGE', (start, end, value) => {
272 |   return `The value of "${start}" must be ${end}. Received "${value}"`;
273 | });
274 | E('ERR_V8BREAKITERATOR', 'Full ICU data not installed. ' +
275 |   'See https://github.com/nodejs/node/wiki/Intl');
276 | E('ERR_VALID_PERFORMANCE_ENTRY_TYPE',
277 |   'At least one valid performance entry type is required');
278 | E('ERR_VALUE_OUT_OF_RANGE', 'The value of "%s" must be %s. Received "%s"');
279 | 
280 | function invalidArgType(name, expected, actual) {
281 |   assert(name, 'name is required');
282 | 
283 |   // determiner: 'must be' or 'must not be'
284 |   let determiner;
285 |   if (expected.includes('not ')) {
286 |     determiner = 'must not be';
287 |     expected = expected.split('not ')[1];
288 |   } else {
289 |     determiner = 'must be';
290 |   }
291 | 
292 |   let msg;
293 |   if (Array.isArray(name)) {
294 |     var names = name.map((val) => `"${val}"`).join(', ');
295 |     msg = `The ${names} arguments ${determiner} ${oneOf(expected, 'type')}`;
296 |   } else if (name.includes(' argument')) {
297 |     // for the case like 'first argument'
298 |     msg = `The ${name} ${determiner} ${oneOf(expected, 'type')}`;
299 |   } else {
300 |     const type = name.includes('.') ? 'property' : 'argument';
301 |     msg = `The "${name}" ${type} ${determiner} ${oneOf(expected, 'type')}`;
302 |   }
303 | 
304 |   // if actual value received, output it
305 |   if (arguments.length >= 3) {
306 |     msg += `. Received type ${actual !== null ? typeof actual : 'null'}`;
307 |   }
308 |   return msg;
309 | }
310 | 
311 | function missingArgs(...args) {
312 |   assert(args.length > 0, 'At least one arg needs to be specified');
313 |   let msg = 'The ';
314 |   const len = args.length;
315 |   args = args.map((a) => `"${a}"`);
316 |   switch (len) {
317 |     case 1:
318 |       msg += `${args[0]} argument`;
319 |       break;
320 |     case 2:
321 |       msg += `${args[0]} and ${args[1]} arguments`;
322 |       break;
323 |     default:
324 |       msg += args.slice(0, len - 1).join(', ');
325 |       msg += `, and ${args[len - 1]} arguments`;
326 |       break;
327 |   }
328 |   return `${msg} must be specified`;
329 | }
330 | 
331 | function oneOf(expected, thing) {
332 |   assert(expected, 'expected is required');
333 |   assert(typeof thing === 'string', 'thing is required');
334 |   if (Array.isArray(expected)) {
335 |     const len = expected.length;
336 |     assert(len > 0, 'At least one expected value needs to be specified');
337 |     expected = expected.map((i) => String(i));
338 |     if (len > 2) {
339 |       return `one of ${thing} ${expected.slice(0, len - 1).join(', ')}, or ` +
340 |              expected[len - 1];
341 |     } else if (len === 2) {
342 |       return `one of ${thing} ${expected[0]} or ${expected[1]}`;
343 |     } else {
344 |       return `of ${thing} ${expected[0]}`;
345 |     }
346 |   } else {
347 |     return `of ${thing} ${String(expected)}`;
348 |   }
349 | }
350 | 
351 | function bufferOutOfBounds(name, isWriting) {
352 |   if (isWriting) {
353 |     return 'Attempt to write outside buffer bounds';
354 |   } else {
355 |     return `"${name}" is outside of buffer bounds`;
356 |   }
357 | }
358 | 
359 | function invalidChar(name, field) {
360 |   let msg = `Invalid character in ${name}`;
361 |   if (field) {
362 |     msg += ` ["${field}"]`;
363 |   }
364 |   return msg;
365 | }


--------------------------------------------------------------------------------
/src/internal/events.js:
--------------------------------------------------------------------------------
  1 | // Copyright Joyent, Inc. and other Node contributors.
  2 | //
  3 | // Permission is hereby granted, free of charge, to any person obtaining a
  4 | // copy of this software and associated documentation files (the
  5 | // "Software"), to deal in the Software without restriction, including
  6 | // without limitation the rights to use, copy, modify, merge, publish,
  7 | // distribute, sublicense, and/or sell copies of the Software, and to permit
  8 | // persons to whom the Software is furnished to do so, subject to the
  9 | // following conditions:
 10 | //
 11 | // The above copyright notice and this permission notice shall be included
 12 | // in all copies or substantial portions of the Software.
 13 | //
 14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 15 | // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 16 | // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 17 | // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 18 | // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 19 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 20 | // USE OR OTHER DEALINGS IN THE SOFTWARE.
 21 | 
 22 | 'use strict';
 23 | 
 24 | var domain;
 25 | 
 26 | function EventEmitter() {
 27 |   EventEmitter.init.call(this);
 28 | }
 29 | module.exports = EventEmitter;
 30 | 
 31 | // Backwards-compat with node 0.10.x
 32 | EventEmitter.EventEmitter = EventEmitter;
 33 | 
 34 | EventEmitter.usingDomains = false;
 35 | 
 36 | EventEmitter.prototype.domain = undefined;
 37 | EventEmitter.prototype._events = undefined;
 38 | EventEmitter.prototype._maxListeners = undefined;
 39 | 
 40 | // By default EventEmitters will print a warning if more than 10 listeners are
 41 | // added to it. This is a useful default which helps finding memory leaks.
 42 | var defaultMaxListeners = 10;
 43 | 
 44 | Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
 45 |   enumerable: true,
 46 |   get: function() {
 47 |     return defaultMaxListeners;
 48 |   },
 49 |   set: function(arg) {
 50 |     // force global console to be compiled.
 51 |     // see https://github.com/nodejs/node/issues/4467
 52 |     console;
 53 |     // check whether the input is a positive number (whose value is zero or
 54 |     // greater and not a NaN).
 55 |     if (typeof arg !== 'number' || arg < 0 || arg !== arg)
 56 |       throw new TypeError('"defaultMaxListeners" must be a positive number');
 57 |     defaultMaxListeners = arg;
 58 |   }
 59 | });
 60 | 
 61 | EventEmitter.init = function() {
 62 |   this.domain = null;
 63 |   if (EventEmitter.usingDomains) {
 64 |     // if there is an active domain, then attach to it.
 65 |     domain = domain || require('domain');
 66 |     if (domain.active && !(this instanceof domain.Domain)) {
 67 |       this.domain = domain.active;
 68 |     }
 69 |   }
 70 | 
 71 |   if (!this._events || this._events === Object.getPrototypeOf(this)._events) {
 72 |     this._events = Object.create(null);
 73 |     this._eventsCount = 0;
 74 |   }
 75 | 
 76 |   this._maxListeners = this._maxListeners || undefined;
 77 | };
 78 | 
 79 | // Obviously not all Emitters should be limited to 10. This function allows
 80 | // that to be increased. Set to zero for unlimited.
 81 | EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
 82 |   if (typeof n !== 'number' || n < 0 || isNaN(n))
 83 |     throw new TypeError('"n" argument must be a positive number');
 84 |   this._maxListeners = n;
 85 |   return this;
 86 | };
 87 | 
 88 | function $getMaxListeners(that) {
 89 |   if (that._maxListeners === undefined)
 90 |     return EventEmitter.defaultMaxListeners;
 91 |   return that._maxListeners;
 92 | }
 93 | 
 94 | EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
 95 |   return $getMaxListeners(this);
 96 | };
 97 | 
 98 | // These standalone emit* functions are used to optimize calling of event
 99 | // handlers for fast cases because emit() itself often has a variable number of
100 | // arguments and can be deoptimized because of that. These functions always have
101 | // the same number of arguments and thus do not get deoptimized, so the code
102 | // inside them can execute faster.
103 | function emitNone(handler, isFn, self) {
104 |   if (isFn)
105 |     handler.call(self);
106 |   else {
107 |     var len = handler.length;
108 |     var listeners = arrayClone(handler, len);
109 |     for (var i = 0; i < len; ++i)
110 |       listeners[i].call(self);
111 |   }
112 | }
113 | function emitOne(handler, isFn, self, arg1) {
114 |   if (isFn)
115 |     handler.call(self, arg1);
116 |   else {
117 |     var len = handler.length;
118 |     var listeners = arrayClone(handler, len);
119 |     for (var i = 0; i < len; ++i)
120 |       listeners[i].call(self, arg1);
121 |   }
122 | }
123 | function emitTwo(handler, isFn, self, arg1, arg2) {
124 |   if (isFn)
125 |     handler.call(self, arg1, arg2);
126 |   else {
127 |     var len = handler.length;
128 |     var listeners = arrayClone(handler, len);
129 |     for (var i = 0; i < len; ++i)
130 |       listeners[i].call(self, arg1, arg2);
131 |   }
132 | }
133 | function emitThree(handler, isFn, self, arg1, arg2, arg3) {
134 |   if (isFn)
135 |     handler.call(self, arg1, arg2, arg3);
136 |   else {
137 |     var len = handler.length;
138 |     var listeners = arrayClone(handler, len);
139 |     for (var i = 0; i < len; ++i)
140 |       listeners[i].call(self, arg1, arg2, arg3);
141 |   }
142 | }
143 | 
144 | function emitMany(handler, isFn, self, args) {
145 |   if (isFn)
146 |     handler.apply(self, args);
147 |   else {
148 |     var len = handler.length;
149 |     var listeners = arrayClone(handler, len);
150 |     for (var i = 0; i < len; ++i)
151 |       listeners[i].apply(self, args);
152 |   }
153 | }
154 | 
155 | EventEmitter.prototype.emit = function emit(type) {
156 |   var er, handler, len, args, i, events, domain;
157 |   var needDomainExit = false;
158 |   var doError = (type === 'error');
159 | 
160 |   events = this._events;
161 |   if (events)
162 |     doError = (doError && events.error == null);
163 |   else if (!doError)
164 |     return false;
165 | 
166 |   domain = this.domain;
167 | 
168 |   // If there is no 'error' event listener then throw.
169 |   if (doError) {
170 |     if (arguments.length > 1)
171 |       er = arguments[1];
172 |     if (domain) {
173 |       if (!er)
174 |         er = new Error('Unhandled "error" event');
175 |       if (typeof er === 'object' && er !== null) {
176 |         er.domainEmitter = this;
177 |         er.domain = domain;
178 |         er.domainThrown = false;
179 |       }
180 |       domain.emit('error', er);
181 |     } else if (er instanceof Error) {
182 |       throw er; // Unhandled 'error' event
183 |     } else {
184 |       // At least give some kind of context to the user
185 |       const err = new Error('Unhandled "error" event. (' + er + ')');
186 |       err.context = er;
187 |       throw err;
188 |     }
189 |     return false;
190 |   }
191 | 
192 |   handler = events[type];
193 | 
194 |   if (!handler)
195 |     return false;
196 | 
197 |   if (domain && this !== process) {
198 |     domain.enter();
199 |     needDomainExit = true;
200 |   }
201 | 
202 |   var isFn = typeof handler === 'function';
203 |   len = arguments.length;
204 |   switch (len) {
205 |     // fast cases
206 |     case 1:
207 |       emitNone(handler, isFn, this);
208 |       break;
209 |     case 2:
210 |       emitOne(handler, isFn, this, arguments[1]);
211 |       break;
212 |     case 3:
213 |       emitTwo(handler, isFn, this, arguments[1], arguments[2]);
214 |       break;
215 |     case 4:
216 |       emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
217 |       break;
218 |     // slower
219 |     default:
220 |       args = new Array(len - 1);
221 |       for (i = 1; i < len; i++)
222 |         args[i - 1] = arguments[i];
223 |       emitMany(handler, isFn, this, args);
224 |   }
225 | 
226 |   if (needDomainExit)
227 |     domain.exit();
228 | 
229 |   return true;
230 | };
231 | 
232 | function _addListener(target, type, listener, prepend) {
233 |   var m;
234 |   var events;
235 |   var existing;
236 | 
237 |   if (typeof listener !== 'function')
238 |     throw new TypeError('"listener" argument must be a function');
239 | 
240 |   events = target._events;
241 |   if (!events) {
242 |     events = target._events = Object.create(null);
243 |     target._eventsCount = 0;
244 |   } else {
245 |     // To avoid recursion in the case that type === "newListener"! Before
246 |     // adding it to the listeners, first emit "newListener".
247 |     if (events.newListener) {
248 |       target.emit('newListener', type,
249 |                   listener.listener ? listener.listener : listener);
250 | 
251 |       // Re-assign `events` because a newListener handler could have caused the
252 |       // this._events to be assigned to a new object
253 |       events = target._events;
254 |     }
255 |     existing = events[type];
256 |   }
257 | 
258 |   if (!existing) {
259 |     // Optimize the case of one listener. Don't need the extra array object.
260 |     existing = events[type] = listener;
261 |     ++target._eventsCount;
262 |   } else {
263 |     if (typeof existing === 'function') {
264 |       // Adding the second element, need to change to array.
265 |       existing = events[type] =
266 |         prepend ? [listener, existing] : [existing, listener];
267 |     } else {
268 |       // If we've already got an array, just append.
269 |       if (prepend) {
270 |         existing.unshift(listener);
271 |       } else {
272 |         existing.push(listener);
273 |       }
274 |     }
275 | 
276 |     // Check for listener leak
277 |     if (!existing.warned) {
278 |       m = $getMaxListeners(target);
279 |       if (m && m > 0 && existing.length > m) {
280 |         existing.warned = true;
281 |         const w = new Error('Possible EventEmitter memory leak detected. ' +
282 |                             `${existing.length} ${String(type)} listeners ` +
283 |                             'added. Use emitter.setMaxListeners() to ' +
284 |                             'increase limit');
285 |         w.name = 'MaxListenersExceededWarning';
286 |         w.emitter = target;
287 |         w.type = type;
288 |         w.count = existing.length;
289 |         process.emitWarning(w);
290 |       }
291 |     }
292 |   }
293 | 
294 |   return target;
295 | }
296 | 
297 | EventEmitter.prototype.addListener = function addListener(type, listener) {
298 |   return _addListener(this, type, listener, false);
299 | };
300 | 
301 | EventEmitter.prototype.on = EventEmitter.prototype.addListener;
302 | 
303 | EventEmitter.prototype.prependListener =
304 |     function prependListener(type, listener) {
305 |       return _addListener(this, type, listener, true);
306 |     };
307 | 
308 | function onceWrapper() {
309 |   if (!this.fired) {
310 |     this.target.removeListener(this.type, this.wrapFn);
311 |     this.fired = true;
312 |     switch (arguments.length) {
313 |       case 0:
314 |         return this.listener.call(this.target);
315 |       case 1:
316 |         return this.listener.call(this.target, arguments[0]);
317 |       case 2:
318 |         return this.listener.call(this.target, arguments[0], arguments[1]);
319 |       case 3:
320 |         return this.listener.call(this.target, arguments[0], arguments[1],
321 |                                   arguments[2]);
322 |       default:
323 |         const args = new Array(arguments.length);
324 |         for (var i = 0; i < args.length; ++i)
325 |           args[i] = arguments[i];
326 |         this.listener.apply(this.target, args);
327 |     }
328 |   }
329 | }
330 | 
331 | function _onceWrap(target, type, listener) {
332 |   var state = { fired: false, wrapFn: undefined, target, type, listener };
333 |   var wrapped = onceWrapper.bind(state);
334 |   wrapped.listener = listener;
335 |   state.wrapFn = wrapped;
336 |   return wrapped;
337 | }
338 | 
339 | EventEmitter.prototype.once = function once(type, listener) {
340 |   if (typeof listener !== 'function')
341 |     throw new TypeError('"listener" argument must be a function');
342 |   this.on(type, _onceWrap(this, type, listener));
343 |   return this;
344 | };
345 | 
346 | EventEmitter.prototype.prependOnceListener =
347 |     function prependOnceListener(type, listener) {
348 |       if (typeof listener !== 'function')
349 |         throw new TypeError('"listener" argument must be a function');
350 |       this.prependListener(type, _onceWrap(this, type, listener));
351 |       return this;
352 |     };
353 | 
354 | // Emits a 'removeListener' event if and only if the listener was removed.
355 | EventEmitter.prototype.removeListener =
356 |     function removeListener(type, listener) {
357 |       var list, events, position, i, originalListener;
358 | 
359 |       if (typeof listener !== 'function')
360 |         throw new TypeError('"listener" argument must be a function');
361 | 
362 |       events = this._events;
363 |       if (!events)
364 |         return this;
365 | 
366 |       list = events[type];
367 |       if (!list)
368 |         return this;
369 | 
370 |       if (list === listener || list.listener === listener) {
371 |         if (--this._eventsCount === 0)
372 |           this._events = Object.create(null);
373 |         else {
374 |           delete events[type];
375 |           if (events.removeListener)
376 |             this.emit('removeListener', type, list.listener || listener);
377 |         }
378 |       } else if (typeof list !== 'function') {
379 |         position = -1;
380 | 
381 |         for (i = list.length - 1; i >= 0; i--) {
382 |           if (list[i] === listener || list[i].listener === listener) {
383 |             originalListener = list[i].listener;
384 |             position = i;
385 |             break;
386 |           }
387 |         }
388 | 
389 |         if (position < 0)
390 |           return this;
391 | 
392 |         if (position === 0)
393 |           list.shift();
394 |         else
395 |           spliceOne(list, position);
396 | 
397 |         if (list.length === 1)
398 |           events[type] = list[0];
399 | 
400 |         if (events.removeListener)
401 |           this.emit('removeListener', type, originalListener || listener);
402 |       }
403 | 
404 |       return this;
405 |     };
406 | 
407 | EventEmitter.prototype.removeAllListeners =
408 |     function removeAllListeners(type) {
409 |       var listeners, events, i;
410 | 
411 |       events = this._events;
412 |       if (!events)
413 |         return this;
414 | 
415 |       // not listening for removeListener, no need to emit
416 |       if (!events.removeListener) {
417 |         if (arguments.length === 0) {
418 |           this._events = Object.create(null);
419 |           this._eventsCount = 0;
420 |         } else if (events[type]) {
421 |           if (--this._eventsCount === 0)
422 |             this._events = Object.create(null);
423 |           else
424 |             delete events[type];
425 |         }
426 |         return this;
427 |       }
428 | 
429 |       // emit removeListener for all listeners on all events
430 |       if (arguments.length === 0) {
431 |         var keys = Object.keys(events);
432 |         var key;
433 |         for (i = 0; i < keys.length; ++i) {
434 |           key = keys[i];
435 |           if (key === 'removeListener') continue;
436 |           this.removeAllListeners(key);
437 |         }
438 |         this.removeAllListeners('removeListener');
439 |         this._events = Object.create(null);
440 |         this._eventsCount = 0;
441 |         return this;
442 |       }
443 | 
444 |       listeners = events[type];
445 | 
446 |       if (typeof listeners === 'function') {
447 |         this.removeListener(type, listeners);
448 |       } else if (listeners) {
449 |         // LIFO order
450 |         for (i = listeners.length - 1; i >= 0; i--) {
451 |           this.removeListener(type, listeners[i]);
452 |         }
453 |       }
454 | 
455 |       return this;
456 |     };
457 | 
458 | EventEmitter.prototype.listeners = function listeners(type) {
459 |   var evlistener;
460 |   var ret;
461 |   var events = this._events;
462 | 
463 |   if (!events)
464 |     ret = [];
465 |   else {
466 |     evlistener = events[type];
467 |     if (!evlistener)
468 |       ret = [];
469 |     else if (typeof evlistener === 'function')
470 |       ret = [evlistener.listener || evlistener];
471 |     else
472 |       ret = unwrapListeners(evlistener);
473 |   }
474 | 
475 |   return ret;
476 | };
477 | 
478 | EventEmitter.listenerCount = function(emitter, type) {
479 |   if (typeof emitter.listenerCount === 'function') {
480 |     return emitter.listenerCount(type);
481 |   } else {
482 |     return listenerCount.call(emitter, type);
483 |   }
484 | };
485 | 
486 | EventEmitter.prototype.listenerCount = listenerCount;
487 | function listenerCount(type) {
488 |   const events = this._events;
489 | 
490 |   if (events) {
491 |     const evlistener = events[type];
492 | 
493 |     if (typeof evlistener === 'function') {
494 |       return 1;
495 |     } else if (evlistener) {
496 |       return evlistener.length;
497 |     }
498 |   }
499 | 
500 |   return 0;
501 | }
502 | 
503 | EventEmitter.prototype.eventNames = function eventNames() {
504 |   return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
505 | };
506 | 
507 | // About 1.5x faster than the two-arg version of Array#splice().
508 | function spliceOne(list, index) {
509 |   for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
510 |     list[i] = list[k];
511 |   list.pop();
512 | }
513 | 
514 | function arrayClone(arr, n) {
515 |   var copy = new Array(n);
516 |   for (var i = 0; i < n; ++i)
517 |     copy[i] = arr[i];
518 |   return copy;
519 | }
520 | 
521 | function unwrapListeners(arr) {
522 |   const ret = new Array(arr.length);
523 |   for (var i = 0; i < ret.length; ++i) {
524 |     ret[i] = arr[i].listener || arr[i];
525 |   }
526 |   return ret;
527 | }


--------------------------------------------------------------------------------
/src/internal/path.js:
--------------------------------------------------------------------------------
  1 | // Copyright Joyent, Inc. and other Node contributors.
  2 | //
  3 | // Permission is hereby granted, free of charge, to any person obtaining a
  4 | // copy of this software and associated documentation files (the
  5 | // "Software"), to deal in the Software without restriction, including
  6 | // without limitation the rights to use, copy, modify, merge, publish,
  7 | // distribute, sublicense, and/or sell copies of the Software, and to permit
  8 | // persons to whom the Software is furnished to do so, subject to the
  9 | // following conditions:
 10 | //
 11 | // The above copyright notice and this permission notice shall be included
 12 | // in all copies or substantial portions of the Software.
 13 | //
 14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 15 | // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 16 | // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 17 | // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 18 | // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 19 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 20 | // USE OR OTHER DEALINGS IN THE SOFTWARE.
 21 | 
 22 | 'use strict';
 23 | 
 24 | const errors = require('errors');
 25 | 
 26 | function assertPath(path) {
 27 |   if (typeof path !== 'string') {
 28 |     throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'path', 'string');
 29 |   }
 30 | }
 31 | 
 32 | // Resolves . and .. elements in a path with directory names
 33 | function normalizeStringWin32(path, allowAboveRoot) {
 34 |   var res = '';
 35 |   var lastSlash = -1;
 36 |   var dots = 0;
 37 |   var code;
 38 |   var isAboveRoot = false;
 39 |   for (var i = 0; i <= path.length; ++i) {
 40 |     if (i < path.length)
 41 |       code = path.charCodeAt(i);
 42 |     else if (code === 47/*/*/ || code === 92/*\*/)
 43 |       break;
 44 |     else
 45 |       code = 47/*/*/;
 46 |     if (code === 47/*/*/ || code === 92/*\*/) {
 47 |       if (lastSlash === i - 1 || dots === 1) {
 48 |         // NOOP
 49 |       } else if (lastSlash !== i - 1 && dots === 2) {
 50 |         if (res.length < 2 || !isAboveRoot ||
 51 |             res.charCodeAt(res.length - 1) !== 46/*.*/ ||
 52 |             res.charCodeAt(res.length - 2) !== 46/*.*/) {
 53 |           if (res.length > 2) {
 54 |             const start = res.length - 1;
 55 |             var j = start;
 56 |             for (; j >= 0; --j) {
 57 |               if (res.charCodeAt(j) === 92/*\*/)
 58 |                 break;
 59 |             }
 60 |             if (j !== start) {
 61 |               if (j === -1)
 62 |                 res = '';
 63 |               else
 64 |                 res = res.slice(0, j);
 65 |               lastSlash = i;
 66 |               dots = 0;
 67 |               isAboveRoot = false;
 68 |               continue;
 69 |             }
 70 |           } else if (res.length === 2 || res.length === 1) {
 71 |             res = '';
 72 |             lastSlash = i;
 73 |             dots = 0;
 74 |             isAboveRoot = false;
 75 |             continue;
 76 |           }
 77 |         }
 78 |         if (allowAboveRoot) {
 79 |           if (res.length > 0)
 80 |             res += '\\..';
 81 |           else
 82 |             res = '..';
 83 |           isAboveRoot = true;
 84 |         }
 85 |       } else {
 86 |         if (res.length > 0)
 87 |           res += '\\' + path.slice(lastSlash + 1, i);
 88 |         else
 89 |           res = path.slice(lastSlash + 1, i);
 90 |         isAboveRoot = false;
 91 |       }
 92 |       lastSlash = i;
 93 |       dots = 0;
 94 |     } else if (code === 46/*.*/ && dots !== -1) {
 95 |       ++dots;
 96 |     } else {
 97 |       dots = -1;
 98 |     }
 99 |   }
100 |   return res;
101 | }
102 | 
103 | // Resolves . and .. elements in a path with directory names
104 | function normalizeStringPosix(path, allowAboveRoot) {
105 |   var res = '';
106 |   var lastSlash = -1;
107 |   var dots = 0;
108 |   var code;
109 |   var isAboveRoot = false;
110 |   for (var i = 0; i <= path.length; ++i) {
111 |     if (i < path.length)
112 |       code = path.charCodeAt(i);
113 |     else if (code === 47/*/*/)
114 |       break;
115 |     else
116 |       code = 47/*/*/;
117 |     if (code === 47/*/*/) {
118 |       if (lastSlash === i - 1 || dots === 1) {
119 |         // NOOP
120 |       } else if (lastSlash !== i - 1 && dots === 2) {
121 |         if (res.length < 2 || !isAboveRoot ||
122 |             res.charCodeAt(res.length - 1) !== 46/*.*/ ||
123 |             res.charCodeAt(res.length - 2) !== 46/*.*/) {
124 |           if (res.length > 2) {
125 |             const start = res.length - 1;
126 |             var j = start;
127 |             for (; j >= 0; --j) {
128 |               if (res.charCodeAt(j) === 47/*/*/)
129 |                 break;
130 |             }
131 |             if (j !== start) {
132 |               if (j === -1)
133 |                 res = '';
134 |               else
135 |                 res = res.slice(0, j);
136 |               lastSlash = i;
137 |               dots = 0;
138 |               isAboveRoot = false;
139 |               continue;
140 |             }
141 |           } else if (res.length === 2 || res.length === 1) {
142 |             res = '';
143 |             lastSlash = i;
144 |             dots = 0;
145 |             isAboveRoot = false;
146 |             continue;
147 |           }
148 |         }
149 |         if (allowAboveRoot) {
150 |           if (res.length > 0)
151 |             res += '/..';
152 |           else
153 |             res = '..';
154 |           isAboveRoot = true;
155 |         }
156 |       } else {
157 |         if (res.length > 0)
158 |           res += '/' + path.slice(lastSlash + 1, i);
159 |         else
160 |           res = path.slice(lastSlash + 1, i);
161 |         isAboveRoot = false;
162 |       }
163 |       lastSlash = i;
164 |       dots = 0;
165 |     } else if (code === 46/*.*/ && dots !== -1) {
166 |       ++dots;
167 |     } else {
168 |       dots = -1;
169 |     }
170 |   }
171 |   return res;
172 | }
173 | 
174 | function _format(sep, pathObject) {
175 |   const dir = pathObject.dir || pathObject.root;
176 |   const base = pathObject.base ||
177 |     ((pathObject.name || '') + (pathObject.ext || ''));
178 |   if (!dir) {
179 |     return base;
180 |   }
181 |   if (dir === pathObject.root) {
182 |     return dir + base;
183 |   }
184 |   return dir + sep + base;
185 | }
186 | 
187 | const posix = {
188 |   // path.resolve([from ...], to)
189 |   resolve: function resolve() {
190 |     var resolvedPath = '';
191 |     var resolvedAbsolute = false;
192 |     var cwd;
193 | 
194 |     for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
195 |       var path;
196 |       if (i >= 0)
197 |         path = arguments[i];
198 |       else {
199 |         if (cwd === undefined)
200 |           cwd = process.cwd();
201 |         path = cwd;
202 |       }
203 | 
204 |       assertPath(path);
205 | 
206 |       // Skip empty entries
207 |       if (path.length === 0) {
208 |         continue;
209 |       }
210 | 
211 |       resolvedPath = path + '/' + resolvedPath;
212 |       resolvedAbsolute = path.charCodeAt(0) === 47/*/*/;
213 |     }
214 | 
215 |     // At this point the path should be resolved to a full absolute path, but
216 |     // handle relative paths to be safe (might happen when process.cwd() fails)
217 | 
218 |     // Normalize the path
219 |     resolvedPath = normalizeStringPosix(resolvedPath, !resolvedAbsolute);
220 | 
221 |     if (resolvedAbsolute) {
222 |       if (resolvedPath.length > 0)
223 |         return '/' + resolvedPath;
224 |       else
225 |         return '/';
226 |     } else if (resolvedPath.length > 0) {
227 |       return resolvedPath;
228 |     } else {
229 |       return '.';
230 |     }
231 |   },
232 | 
233 | 
234 |   normalize: function normalize(path) {
235 |     assertPath(path);
236 | 
237 |     if (path.length === 0)
238 |       return '.';
239 | 
240 |     const isAbsolute = path.charCodeAt(0) === 47/*/*/;
241 |     const trailingSeparator = path.charCodeAt(path.length - 1) === 47/*/*/;
242 | 
243 |     // Normalize the path
244 |     path = normalizeStringPosix(path, !isAbsolute);
245 | 
246 |     if (path.length === 0 && !isAbsolute)
247 |       path = '.';
248 |     if (path.length > 0 && trailingSeparator)
249 |       path += '/';
250 | 
251 |     if (isAbsolute)
252 |       return '/' + path;
253 |     return path;
254 |   },
255 | 
256 | 
257 |   isAbsolute: function isAbsolute(path) {
258 |     assertPath(path);
259 |     return path.length > 0 && path.charCodeAt(0) === 47/*/*/;
260 |   },
261 | 
262 | 
263 |   join: function join() {
264 |     if (arguments.length === 0)
265 |       return '.';
266 |     var joined;
267 |     for (var i = 0; i < arguments.length; ++i) {
268 |       var arg = arguments[i];
269 |       assertPath(arg);
270 |       if (arg.length > 0) {
271 |         if (joined === undefined)
272 |           joined = arg;
273 |         else
274 |           joined += '/' + arg;
275 |       }
276 |     }
277 |     if (joined === undefined)
278 |       return '.';
279 |     return posix.normalize(joined);
280 |   },
281 | 
282 | 
283 |   relative: function relative(from, to) {
284 |     assertPath(from);
285 |     assertPath(to);
286 | 
287 |     if (from === to)
288 |       return '';
289 | 
290 |     from = posix.resolve(from);
291 |     to = posix.resolve(to);
292 | 
293 |     if (from === to)
294 |       return '';
295 | 
296 |     // Trim any leading backslashes
297 |     var fromStart = 1;
298 |     for (; fromStart < from.length; ++fromStart) {
299 |       if (from.charCodeAt(fromStart) !== 47/*/*/)
300 |         break;
301 |     }
302 |     var fromEnd = from.length;
303 |     var fromLen = (fromEnd - fromStart);
304 | 
305 |     // Trim any leading backslashes
306 |     var toStart = 1;
307 |     for (; toStart < to.length; ++toStart) {
308 |       if (to.charCodeAt(toStart) !== 47/*/*/)
309 |         break;
310 |     }
311 |     var toEnd = to.length;
312 |     var toLen = (toEnd - toStart);
313 | 
314 |     // Compare paths to find the longest common path from root
315 |     var length = (fromLen < toLen ? fromLen : toLen);
316 |     var lastCommonSep = -1;
317 |     var i = 0;
318 |     for (; i <= length; ++i) {
319 |       if (i === length) {
320 |         if (toLen > length) {
321 |           if (to.charCodeAt(toStart + i) === 47/*/*/) {
322 |             // We get here if `from` is the exact base path for `to`.
323 |             // For example: from='/foo/bar'; to='/foo/bar/baz'
324 |             return to.slice(toStart + i + 1);
325 |           } else if (i === 0) {
326 |             // We get here if `from` is the root
327 |             // For example: from='/'; to='/foo'
328 |             return to.slice(toStart + i);
329 |           }
330 |         } else if (fromLen > length) {
331 |           if (from.charCodeAt(fromStart + i) === 47/*/*/) {
332 |             // We get here if `to` is the exact base path for `from`.
333 |             // For example: from='/foo/bar/baz'; to='/foo/bar'
334 |             lastCommonSep = i;
335 |           } else if (i === 0) {
336 |             // We get here if `to` is the root.
337 |             // For example: from='/foo'; to='/'
338 |             lastCommonSep = 0;
339 |           }
340 |         }
341 |         break;
342 |       }
343 |       var fromCode = from.charCodeAt(fromStart + i);
344 |       var toCode = to.charCodeAt(toStart + i);
345 |       if (fromCode !== toCode)
346 |         break;
347 |       else if (fromCode === 47/*/*/)
348 |         lastCommonSep = i;
349 |     }
350 | 
351 |     var out = '';
352 |     // Generate the relative path based on the path difference between `to`
353 |     // and `from`
354 |     for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
355 |       if (i === fromEnd || from.charCodeAt(i) === 47/*/*/) {
356 |         if (out.length === 0)
357 |           out += '..';
358 |         else
359 |           out += '/..';
360 |       }
361 |     }
362 | 
363 |     // Lastly, append the rest of the destination (`to`) path that comes after
364 |     // the common path parts
365 |     if (out.length > 0)
366 |       return out + to.slice(toStart + lastCommonSep);
367 |     else {
368 |       toStart += lastCommonSep;
369 |       if (to.charCodeAt(toStart) === 47/*/*/)
370 |         ++toStart;
371 |       return to.slice(toStart);
372 |     }
373 |   },
374 | 
375 | 
376 |   _makeLong: function _makeLong(path) {
377 |     return path;
378 |   },
379 | 
380 | 
381 |   dirname: function dirname(path) {
382 |     assertPath(path);
383 |     if (path.length === 0)
384 |       return '.';
385 |     var code = path.charCodeAt(0);
386 |     var hasRoot = (code === 47/*/*/);
387 |     var end = -1;
388 |     var matchedSlash = true;
389 |     for (var i = path.length - 1; i >= 1; --i) {
390 |       code = path.charCodeAt(i);
391 |       if (code === 47/*/*/) {
392 |         if (!matchedSlash) {
393 |           end = i;
394 |           break;
395 |         }
396 |       } else {
397 |         // We saw the first non-path separator
398 |         matchedSlash = false;
399 |       }
400 |     }
401 | 
402 |     if (end === -1)
403 |       return hasRoot ? '/' : '.';
404 |     if (hasRoot && end === 1)
405 |       return '//';
406 |     return path.slice(0, end);
407 |   },
408 | 
409 | 
410 |   basename: function basename(path, ext) {
411 |     if (ext !== undefined && typeof ext !== 'string')
412 |       throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'ext', 'string');
413 |     assertPath(path);
414 | 
415 |     var start = 0;
416 |     var end = -1;
417 |     var matchedSlash = true;
418 |     var i;
419 | 
420 |     if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
421 |       if (ext.length === path.length && ext === path)
422 |         return '';
423 |       var extIdx = ext.length - 1;
424 |       var firstNonSlashEnd = -1;
425 |       for (i = path.length - 1; i >= 0; --i) {
426 |         const code = path.charCodeAt(i);
427 |         if (code === 47/*/*/) {
428 |           // If we reached a path separator that was not part of a set of path
429 |           // separators at the end of the string, stop now
430 |           if (!matchedSlash) {
431 |             start = i + 1;
432 |             break;
433 |           }
434 |         } else {
435 |           if (firstNonSlashEnd === -1) {
436 |             // We saw the first non-path separator, remember this index in case
437 |             // we need it if the extension ends up not matching
438 |             matchedSlash = false;
439 |             firstNonSlashEnd = i + 1;
440 |           }
441 |           if (extIdx >= 0) {
442 |             // Try to match the explicit extension
443 |             if (code === ext.charCodeAt(extIdx)) {
444 |               if (--extIdx === -1) {
445 |                 // We matched the extension, so mark this as the end of our path
446 |                 // component
447 |                 end = i;
448 |               }
449 |             } else {
450 |               // Extension does not match, so our result is the entire path
451 |               // component
452 |               extIdx = -1;
453 |               end = firstNonSlashEnd;
454 |             }
455 |           }
456 |         }
457 |       }
458 | 
459 |       if (start === end)
460 |         end = firstNonSlashEnd;
461 |       else if (end === -1)
462 |         end = path.length;
463 |       return path.slice(start, end);
464 |     } else {
465 |       for (i = path.length - 1; i >= 0; --i) {
466 |         if (path.charCodeAt(i) === 47/*/*/) {
467 |           // If we reached a path separator that was not part of a set of path
468 |           // separators at the end of the string, stop now
469 |           if (!matchedSlash) {
470 |             start = i + 1;
471 |             break;
472 |           }
473 |         } else if (end === -1) {
474 |           // We saw the first non-path separator, mark this as the end of our
475 |           // path component
476 |           matchedSlash = false;
477 |           end = i + 1;
478 |         }
479 |       }
480 | 
481 |       if (end === -1)
482 |         return '';
483 |       return path.slice(start, end);
484 |     }
485 |   },
486 | 
487 | 
488 |   extname: function extname(path) {
489 |     assertPath(path);
490 |     var startDot = -1;
491 |     var startPart = 0;
492 |     var end = -1;
493 |     var matchedSlash = true;
494 |     // Track the state of characters (if any) we see before our first dot and
495 |     // after any path separator we find
496 |     var preDotState = 0;
497 |     for (var i = path.length - 1; i >= 0; --i) {
498 |       const code = path.charCodeAt(i);
499 |       if (code === 47/*/*/) {
500 |         // If we reached a path separator that was not part of a set of path
501 |         // separators at the end of the string, stop now
502 |         if (!matchedSlash) {
503 |           startPart = i + 1;
504 |           break;
505 |         }
506 |         continue;
507 |       }
508 |       if (end === -1) {
509 |         // We saw the first non-path separator, mark this as the end of our
510 |         // extension
511 |         matchedSlash = false;
512 |         end = i + 1;
513 |       }
514 |       if (code === 46/*.*/) {
515 |         // If this is our first dot, mark it as the start of our extension
516 |         if (startDot === -1)
517 |           startDot = i;
518 |         else if (preDotState !== 1)
519 |           preDotState = 1;
520 |       } else if (startDot !== -1) {
521 |         // We saw a non-dot and non-path separator before our dot, so we should
522 |         // have a good chance at having a non-empty extension
523 |         preDotState = -1;
524 |       }
525 |     }
526 | 
527 |     if (startDot === -1 ||
528 |         end === -1 ||
529 |         // We saw a non-dot character immediately before the dot
530 |         preDotState === 0 ||
531 |         // The (right-most) trimmed path component is exactly '..'
532 |         (preDotState === 1 &&
533 |          startDot === end - 1 &&
534 |          startDot === startPart + 1)) {
535 |       return '';
536 |     }
537 |     return path.slice(startDot, end);
538 |   },
539 | 
540 | 
541 |   format: function format(pathObject) {
542 |     if (pathObject === null || typeof pathObject !== 'object') {
543 |       throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'pathObject', 'Object',
544 |                                  pathObject);
545 |     }
546 |     return _format('/', pathObject);
547 |   },
548 | 
549 | 
550 |   parse: function parse(path) {
551 |     assertPath(path);
552 | 
553 |     var ret = { root: '', dir: '', base: '', ext: '', name: '' };
554 |     if (path.length === 0)
555 |       return ret;
556 |     var code = path.charCodeAt(0);
557 |     var isAbsolute = (code === 47/*/*/);
558 |     var start;
559 |     if (isAbsolute) {
560 |       ret.root = '/';
561 |       start = 1;
562 |     } else {
563 |       start = 0;
564 |     }
565 |     var startDot = -1;
566 |     var startPart = 0;
567 |     var end = -1;
568 |     var matchedSlash = true;
569 |     var i = path.length - 1;
570 | 
571 |     // Track the state of characters (if any) we see before our first dot and
572 |     // after any path separator we find
573 |     var preDotState = 0;
574 | 
575 |     // Get non-dir info
576 |     for (; i >= start; --i) {
577 |       code = path.charCodeAt(i);
578 |       if (code === 47/*/*/) {
579 |         // If we reached a path separator that was not part of a set of path
580 |         // separators at the end of the string, stop now
581 |         if (!matchedSlash) {
582 |           startPart = i + 1;
583 |           break;
584 |         }
585 |         continue;
586 |       }
587 |       if (end === -1) {
588 |         // We saw the first non-path separator, mark this as the end of our
589 |         // extension
590 |         matchedSlash = false;
591 |         end = i + 1;
592 |       }
593 |       if (code === 46/*.*/) {
594 |         // If this is our first dot, mark it as the start of our extension
595 |         if (startDot === -1)
596 |           startDot = i;
597 |         else if (preDotState !== 1)
598 |           preDotState = 1;
599 |       } else if (startDot !== -1) {
600 |         // We saw a non-dot and non-path separator before our dot, so we should
601 |         // have a good chance at having a non-empty extension
602 |         preDotState = -1;
603 |       }
604 |     }
605 | 
606 |     if (startDot === -1 ||
607 |         end === -1 ||
608 |         // We saw a non-dot character immediately before the dot
609 |         preDotState === 0 ||
610 |         // The (right-most) trimmed path component is exactly '..'
611 |         (preDotState === 1 &&
612 |          startDot === end - 1 &&
613 |          startDot === startPart + 1)) {
614 |       if (end !== -1) {
615 |         if (startPart === 0 && isAbsolute)
616 |           ret.base = ret.name = path.slice(1, end);
617 |         else
618 |           ret.base = ret.name = path.slice(startPart, end);
619 |       }
620 |     } else {
621 |       if (startPart === 0 && isAbsolute) {
622 |         ret.name = path.slice(1, startDot);
623 |         ret.base = path.slice(1, end);
624 |       } else {
625 |         ret.name = path.slice(startPart, startDot);
626 |         ret.base = path.slice(startPart, end);
627 |       }
628 |       ret.ext = path.slice(startDot, end);
629 |     }
630 | 
631 |     if (startPart > 0)
632 |       ret.dir = path.slice(0, startPart - 1);
633 |     else if (isAbsolute)
634 |       ret.dir = '/';
635 | 
636 |     return ret;
637 |   },
638 | 
639 | 
640 |   sep: '/',
641 |   delimiter: ':',
642 |   win32: null,
643 |   posix: null
644 | };
645 | 
646 | module.exports = posix;


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