Generate all runtime files from dart.

tool/input_sdk/private/generators.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/**
- * This library adapts ES6 generators to implement Dart's async/await.
- *
- * It's designed to interact with Dart's Future/Stream and follow Dart
- * async/await semantics.
- *
- * See https://github.com/dart-lang/dev_compiler/issues/245 for ideas on
- * reconciling Dart's Future and ES6 Promise.
- *
- * Inspired by `co`: https://github.com/tj/co/blob/master/index.js, which is a
- * stepping stone for proposed ES7 async/await, and uses ES6 Promises.
- */
-dart_library.library('dart/_generators', null, /* Imports */[
-], /* Lazy Imports */[
-  'dart/_operations',
-  'dart/_js_helper',
-  'dart/core',
-  'dart/collection',
-  'dart/async'
-], function(exports, _operations, _js_helper, core, collection, async) {
-  'use strict';
+/// This library adapts ES6 generators to implement Dart's async/await.
+/// It's designed to interact with Dart's Future/Stream and follow Dart
+/// async/await semantics.
+/// See https://github.com/dart-lang/dev_compiler/issues/245 for ideas on
+/// reconciling Dart's Future and ES6 Promise.
+/// Inspired by `co`: https://github.com/tj/co/blob/master/index.js, which is a
+/// stepping stone for proposed ES7 async/await, and uses ES6 Promises.
+library dart._generators;
 
-  const _jsIterator = Symbol('_jsIterator');
-  const _current = Symbol('_current');
+import 'dart:_foreign_helper' show JS, JsName, rest, spread, genericTypeConstructor;
+import 'dart:_js_helper' show SyncIterable;
+import 'dart:_operations' show instanceOf, stackTrace;
 
-  function syncStar(gen, E, ...args) {
-    const SyncIterable_E = _js_helper.SyncIterable$(E);
-    return new SyncIterable_E(gen, args);
+import 'dart:async';
+
+final _jsIterator = JS('', 'Symbol("_jsIterator")');
+final _current = JS('', 'Symbol("_current")');
+
+syncStar(gen, E, @rest args) => JS('', '''(() => {
+  // TODO(ochafik).
+  const SyncIterable_E = ${genericTypeConstructor(SyncIterable)}($E);
+  return new SyncIterable_E($gen, $args);
+})()''');
+
+@JsName('async')
+async_(gen, T, @rest args) => JS('', '''(() => {
+  let iter;
+  function onValue(res) {
+    if (res === void 0) res = null;
+    return next(iter.next(res));
   }
-  exports.syncStar = syncStar;
+  function onError(err) {
+    // If the awaited Future throws, we want to convert this to an exception
+    // thrown from the `yield` point, as if it was thrown there.
+    //
+    // If the exception is not caught inside `gen`, it will emerge here, which
+    // will send it to anyone listening on this async function's Future<T>.
+    //
+    // In essence, we are giving the code inside the generator a chance to
+    // use try-catch-finally.
+    return next(iter.throw(err));
+  }
+  function next(ret) {
+    if (ret.done) return ret.value;
+    // Checks if the awaited value is a Future.
+    let future = ret.value;
+    if (!$instanceOf(future, ${genericTypeConstructor(Future)})) {
+      future = $Future.value(future);
+    }
+    // Chain the Future so `await` receives the Future's value.
+    return future.then(onValue, {onError: onError});
+  }
+  return ${genericTypeConstructor(Future)}(T).new(function() {
+    iter = $gen(...$args)[Symbol.iterator]();
+    return onValue();
+  });
+})()''');
 
-  function async_(gen, T, ...args) {
-    let iter;
-    function onValue(res) {
-      if (res === void 0) res = null;
-      return next(iter.next(res));
-    }
-    function onError(err) {
-      // If the awaited Future throws, we want to convert this to an exception
-      // thrown from the `yield` point, as if it was thrown there.
-      //
-      // If the exception is not caught inside `gen`, it will emerge here, which
-      // will send it to anyone listening on this async function's Future<T>.
-      //
-      // In essence, we are giving the code inside the generator a chance to
-      // use try-catch-finally.
-      return next(iter.throw(err));
-    }
-    function next(ret) {
-      if (ret.done) return ret.value;
-      // Checks if the awaited value is a Future.
-      let future = ret.value;
-      if (!_operations.instanceOf(future, async.Future$)) {
-        future = async.Future.value(future);
-      }
-      // Chain the Future so `await` receives the Future's value.
-      return future.then(onValue, {onError: onError});
-    }
-    return async.Future$(T).new(function() {
-      iter = gen(...args)[Symbol.iterator]();
-      return onValue();
-    });
-  }
-  exports.async = async_;
-
-  // Implementation inspired by _AsyncStarStreamController in
-  // dart-lang/sdk's runtime/lib/core_patch.dart
-  //
-  // Given input like:
-  //
-  //     foo() async* {
-  //       yield 1;
-  //       yield* bar();
-  //       print(await baz());
-  //     }
-  //
-  // This generates as:
-  //
-  //    function foo() {
-  //      return dart.asyncStar(function*(stream) {
-  //        if (stream.add(1)) return;
-  //        yield;
-  //        if (stream.addStream(bar()) return;
-  //        yield;
-  //        print(yield baz());
-  //      });
-  //    }
+// Implementation inspired by _AsyncStarStreamController in
+// dart-lang/sdk's runtime/lib/core_patch.dart
+//
+// Given input like:
+//
+//     foo() async* {
+//       yield 1;
+//       yield* bar();
+//       print(await baz());
+//     }
+//
+// This generates as:
+//
+//    function foo() {
+//      return dart.asyncStar(function*(stream) {
+//        if (stream.add(1)) return;
+//        yield;
+//        if (stream.addStream(bar()) return;
+//        yield;
+//        print(yield baz());
+//      });
+//    }
+final _AsyncStarStreamController = JS('', '''
   class _AsyncStarStreamController {
     constructor(generator, T, args) {
       this.isAdding = false;
       this.isWaiting = false;
       this.isScheduled = false;
       this.isSuspendedAtYield = false;
       this.canceler = null;
       this.iterator = generator(this, ...args)[Symbol.iterator]();
-      this.controller = async.StreamController$(T).new({
+      this.controller = ${genericTypeConstructor(StreamController)}(T).new({
         onListen: () => this.scheduleGenerator(),
         onResume: () => this.onResume(),
         onCancel: () => this.onCancel()
       });
     }
 
     onResume() {
       if (this.isSuspendedAtYield) {
         this.scheduleGenerator();
       }
     }
 
     onCancel() {
       if (this.controller.isClosed) {
         return null;
       }
       if (this.canceler == null) {
-        this.canceler = async.Completer.new();
+        this.canceler = $Completer.new();
         this.scheduleGenerator();
       }
       return this.canceler.future;
     }
 
     close() {
       if (this.canceler != null && !this.canceler.isCompleted) {
         // If the stream has been cancelled, complete the cancellation future
         // with the error.
         this.canceler.complete();
       }
       this.controller.close();
     }
 
     scheduleGenerator() {
       // TODO(jmesserly): is this paused check in the right place? Assuming the
       // async* Stream yields, then is paused (by other code), the body will
       // already be scheduled. This will cause at least one more iteration to
       // run (adding another data item to the Stream) before actually pausing.
       // It could be fixed by moving the `isPaused` check inside `runBody`.
       if (this.isScheduled || this.controller.isPaused ||
           this.isAdding || this.isWaiting) {
         return;
       }
       this.isScheduled = true;
-      async.scheduleMicrotask(() => this.runBody());
+      $scheduleMicrotask(() => this.runBody());
     }
 
     runBody(opt_awaitValue) {
       this.isScheduled = false;
       this.isSuspendedAtYield = false;
       this.isWaiting = false;
       let iter;
       try {
         iter = this.iterator.next(opt_awaitValue);
       } catch (e) {
-        this.addError(e, _operations.stackTrace(e));
+        this.addError(e, $stackTrace(e));
         this.close();
         return;
       }
       if (iter.done) {
         this.close();
         return;
       }
 
       // If we're suspended at a yield/yield*, we're done for now.
       if (this.isSuspendedAtYield || this.isAdding) return;
 
       // Handle `await`: if we get a value passed to `yield` it means we are
       // waiting on this Future. Make sure to prevent scheduling, and pass the
       // value back as the result of the `yield`.
       //
       // TODO(jmesserly): is the timing here correct? The assumption here is
       // that we should schedule `await` in `async*` the same as in `async`.
       this.isWaiting = true;
       let future = iter.value;
-      if (!_operations.instanceOf(future, async.Future$)) {
-        future = async.Future.value(future);
+      if (!$instanceOf(future, ${genericTypeConstructor(Future)})) {
+        future = $Future.value(future);
       }
       return future.then((x) => this.runBody(x),
           { onError: (e, s) => this.throwError(e, s) });
     }
 
     // Adds element to stream, returns true if the caller should terminate
     // execution of the generator.
     add(event) {
       // If stream is cancelled, tell caller to exit the async generator.
       if (!this.controller.hasListener) return true;
@@ skipping 31 matching lines @@
       if ((this.canceler != null) && !this.canceler.isCompleted) {
         // If the stream has been cancelled, complete the cancellation future
         // with the error.
         this.canceler.completeError(error, stackTrace);
         return;
       }
       if (!this.controller.hasListener) return;
       this.controller.addError(error, stackTrace);
     }
   }
+''');
 
-  /** Returns a Stream of T implemented by an async* function. */
-  function asyncStar(gen, T, ...args) {
-    return new _AsyncStarStreamController(gen, T, args).controller.stream;
-  }
-  exports.asyncStar = asyncStar;
-});
+/// Returns a Stream of T implemented by an async* function. */
+///
+asyncStar(gen, T, @rest args) => JS('', '''(() => {
+  return new _AsyncStarStreamController($gen, $T, $args).controller.stream;
+})()''');