builtins/PromiseConstructor.js

   1 /*
   2  * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 function all(iterable)
  27 {
  28     "use strict";
  29
  30     if (!@isObject(this))
  31         throw new TypeError("|this| is not a object");
  32
  33     // FIXME: Fix this code when @@species well-known symbol is landed.
  34     // https://bugs.webkit.org/show_bug.cgi?id=146624
  35     var constructor = this;
  36
  37     var promiseCapability = @newPromiseCapability(constructor);
  38
  39     var values = [];
  40     var index = 0;
  41     var remainingElementsCount = 1;
  42
  43     function newResolveElement(index)
  44     {
  45         var alreadyCalled = false;
  46         return function (argument)
  47         {
  48             if (alreadyCalled)
  49                 return undefined;
  50             alreadyCalled = true;
  51
  52             @putByValDirect(values, index, argument);
  53
  54             --remainingElementsCount;
  55             if (remainingElementsCount === 0)
  56                 return promiseCapability.@resolve.@call(undefined, values);
  57
  58             return undefined;
  59         }
  60     }
  61
  62     try {
  63         for (var value of iterable) {
  64             @putByValDirect(values, index, undefined);
  65             var nextPromise = constructor.resolve(value);
  66             var resolveElement = newResolveElement(index);
  67             ++remainingElementsCount;
  68             nextPromise.then(resolveElement, promiseCapability.@reject);
  69             ++index;
  70         }
  71
  72         --remainingElementsCount;
  73         if (remainingElementsCount === 0)
  74             promiseCapability.@resolve.@call(undefined, values);
  75     } catch (error) {
  76         promiseCapability.@reject.@call(undefined, error);
  77     }
  78
  79     return promiseCapability.@promise;
  80 }
  81
  82 function race(iterable)
  83 {
  84     "use strict";
  85
  86     if (!@isObject(this))
  87         throw new TypeError("|this| is not a object");
  88
  89     // FIXME: Fix this code when @@species well-known symbol is landed.
  90     // https://bugs.webkit.org/show_bug.cgi?id=146624
  91     var constructor = this;
  92
  93     var promiseCapability = @newPromiseCapability(constructor);
  94
  95     try {
  96         for (var value of iterable) {
  97             var nextPromise = constructor.resolve(value);
  98             nextPromise.then(promiseCapability.@resolve, promiseCapability.@reject);
  99         }
 100     } catch (error) {
 101         promiseCapability.@reject.@call(undefined, error);
 102     }
 103
 104     return promiseCapability.@promise;
 105 }
 106
 107 function reject(reason)
 108 {
 109     "use strict";
 110
 111     if (!@isObject(this))
 112         throw new TypeError("|this| is not a object");
 113
 114     var promiseCapability = @newPromiseCapability(this);
 115
 116     promiseCapability.@reject.@call(undefined, reason);
 117
 118     return promiseCapability.@promise;
 119 }
 120
 121 function resolve(value)
 122 {
 123     "use strict";
 124
 125     if (!@isObject(this))
 126         throw new TypeError("|this| is not a object");
 127
 128     if (@isPromise(value)) {
 129         var valueConstructor = value.constructor;
 130         if (valueConstructor === this)
 131             return value;
 132     }
 133
 134     var promiseCapability = @newPromiseCapability(this);
 135
 136     promiseCapability.@resolve.@call(undefined, value);
 137
 138     return promiseCapability.@promise;
 139 }