debian-mirror-gitlab/core-js/modules/es.promise.js
2019-09-25 13:30:05 +05:30

371 lines
13 KiB
JavaScript

'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var global = require('../internals/global');
var path = require('../internals/path');
var NativePromise = require('../internals/native-promise-constructor');
var redefine = require('../internals/redefine');
var redefineAll = require('../internals/redefine-all');
var setToStringTag = require('../internals/set-to-string-tag');
var setSpecies = require('../internals/set-species');
var isObject = require('../internals/is-object');
var aFunction = require('../internals/a-function');
var anInstance = require('../internals/an-instance');
var classof = require('../internals/classof-raw');
var iterate = require('../internals/iterate');
var checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');
var speciesConstructor = require('../internals/species-constructor');
var task = require('../internals/task').set;
var microtask = require('../internals/microtask');
var promiseResolve = require('../internals/promise-resolve');
var hostReportErrors = require('../internals/host-report-errors');
var newPromiseCapabilityModule = require('../internals/new-promise-capability');
var perform = require('../internals/perform');
var userAgent = require('../internals/user-agent');
var InternalStateModule = require('../internals/internal-state');
var isForced = require('../internals/is-forced');
var wellKnownSymbol = require('../internals/well-known-symbol');
var SPECIES = wellKnownSymbol('species');
var PROMISE = 'Promise';
var getInternalState = InternalStateModule.get;
var setInternalState = InternalStateModule.set;
var getInternalPromiseState = InternalStateModule.getterFor(PROMISE);
var PromiseConstructor = NativePromise;
var TypeError = global.TypeError;
var document = global.document;
var process = global.process;
var $fetch = global.fetch;
var versions = process && process.versions;
var v8 = versions && versions.v8 || '';
var newPromiseCapability = newPromiseCapabilityModule.f;
var newGenericPromiseCapability = newPromiseCapability;
var IS_NODE = classof(process) == 'process';
var DISPATCH_EVENT = !!(document && document.createEvent && global.dispatchEvent);
var UNHANDLED_REJECTION = 'unhandledrejection';
var REJECTION_HANDLED = 'rejectionhandled';
var PENDING = 0;
var FULFILLED = 1;
var REJECTED = 2;
var HANDLED = 1;
var UNHANDLED = 2;
var Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;
var FORCED = isForced(PROMISE, function () {
// correct subclassing with @@species support
var promise = PromiseConstructor.resolve(1);
var empty = function () { /* empty */ };
var FakePromise = (promise.constructor = {})[SPECIES] = function (exec) {
exec(empty, empty);
};
// unhandled rejections tracking support, NodeJS Promise without it fails @@species test
return !((IS_NODE || typeof PromiseRejectionEvent == 'function')
&& (!IS_PURE || promise['finally'])
&& promise.then(empty) instanceof FakePromise
// v8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
// https://bugs.chromium.org/p/chromium/issues/detail?id=830565
// we can't detect it synchronously, so just check versions
&& v8.indexOf('6.6') !== 0
&& userAgent.indexOf('Chrome/66') === -1);
});
var INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {
PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });
});
// helpers
var isThenable = function (it) {
var then;
return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
};
var notify = function (promise, state, isReject) {
if (state.notified) return;
state.notified = true;
var chain = state.reactions;
microtask(function () {
var value = state.value;
var ok = state.state == FULFILLED;
var index = 0;
// variable length - can't use forEach
while (chain.length > index) {
var reaction = chain[index++];
var handler = ok ? reaction.ok : reaction.fail;
var resolve = reaction.resolve;
var reject = reaction.reject;
var domain = reaction.domain;
var result, then, exited;
try {
if (handler) {
if (!ok) {
if (state.rejection === UNHANDLED) onHandleUnhandled(promise, state);
state.rejection = HANDLED;
}
if (handler === true) result = value;
else {
if (domain) domain.enter();
result = handler(value); // can throw
if (domain) {
domain.exit();
exited = true;
}
}
if (result === reaction.promise) {
reject(TypeError('Promise-chain cycle'));
} else if (then = isThenable(result)) {
then.call(result, resolve, reject);
} else resolve(result);
} else reject(value);
} catch (error) {
if (domain && !exited) domain.exit();
reject(error);
}
}
state.reactions = [];
state.notified = false;
if (isReject && !state.rejection) onUnhandled(promise, state);
});
};
var dispatchEvent = function (name, promise, reason) {
var event, handler;
if (DISPATCH_EVENT) {
event = document.createEvent('Event');
event.promise = promise;
event.reason = reason;
event.initEvent(name, false, true);
global.dispatchEvent(event);
} else event = { promise: promise, reason: reason };
if (handler = global['on' + name]) handler(event);
else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
};
var onUnhandled = function (promise, state) {
task.call(global, function () {
var value = state.value;
var IS_UNHANDLED = isUnhandled(state);
var result;
if (IS_UNHANDLED) {
result = perform(function () {
if (IS_NODE) {
process.emit('unhandledRejection', value, promise);
} else dispatchEvent(UNHANDLED_REJECTION, promise, value);
});
// Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
state.rejection = IS_NODE || isUnhandled(state) ? UNHANDLED : HANDLED;
if (result.error) throw result.value;
}
});
};
var isUnhandled = function (state) {
return state.rejection !== HANDLED && !state.parent;
};
var onHandleUnhandled = function (promise, state) {
task.call(global, function () {
if (IS_NODE) {
process.emit('rejectionHandled', promise);
} else dispatchEvent(REJECTION_HANDLED, promise, state.value);
});
};
var bind = function (fn, promise, state, unwrap) {
return function (value) {
fn(promise, state, value, unwrap);
};
};
var internalReject = function (promise, state, value, unwrap) {
if (state.done) return;
state.done = true;
if (unwrap) state = unwrap;
state.value = value;
state.state = REJECTED;
notify(promise, state, true);
};
var internalResolve = function (promise, state, value, unwrap) {
if (state.done) return;
state.done = true;
if (unwrap) state = unwrap;
try {
if (promise === value) throw TypeError("Promise can't be resolved itself");
var then = isThenable(value);
if (then) {
microtask(function () {
var wrapper = { done: false };
try {
then.call(value,
bind(internalResolve, promise, wrapper, state),
bind(internalReject, promise, wrapper, state)
);
} catch (error) {
internalReject(promise, wrapper, error, state);
}
});
} else {
state.value = value;
state.state = FULFILLED;
notify(promise, state, false);
}
} catch (error) {
internalReject(promise, { done: false }, error, state);
}
};
// constructor polyfill
if (FORCED) {
// 25.4.3.1 Promise(executor)
PromiseConstructor = function Promise(executor) {
anInstance(this, PromiseConstructor, PROMISE);
aFunction(executor);
Internal.call(this);
var state = getInternalState(this);
try {
executor(bind(internalResolve, this, state), bind(internalReject, this, state));
} catch (error) {
internalReject(this, state, error);
}
};
// eslint-disable-next-line no-unused-vars
Internal = function Promise(executor) {
setInternalState(this, {
type: PROMISE,
done: false,
notified: false,
parent: false,
reactions: [],
rejection: false,
state: PENDING,
value: undefined
});
};
Internal.prototype = redefineAll(PromiseConstructor.prototype, {
// `Promise.prototype.then` method
// https://tc39.github.io/ecma262/#sec-promise.prototype.then
then: function then(onFulfilled, onRejected) {
var state = getInternalPromiseState(this);
var reaction = newPromiseCapability(speciesConstructor(this, PromiseConstructor));
reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;
reaction.fail = typeof onRejected == 'function' && onRejected;
reaction.domain = IS_NODE ? process.domain : undefined;
state.parent = true;
state.reactions.push(reaction);
if (state.state != PENDING) notify(this, state, false);
return reaction.promise;
},
// `Promise.prototype.catch` method
// https://tc39.github.io/ecma262/#sec-promise.prototype.catch
'catch': function (onRejected) {
return this.then(undefined, onRejected);
}
});
OwnPromiseCapability = function () {
var promise = new Internal();
var state = getInternalState(promise);
this.promise = promise;
this.resolve = bind(internalResolve, promise, state);
this.reject = bind(internalReject, promise, state);
};
newPromiseCapabilityModule.f = newPromiseCapability = function (C) {
return C === PromiseConstructor || C === PromiseWrapper
? new OwnPromiseCapability(C)
: newGenericPromiseCapability(C);
};
if (!IS_PURE && typeof NativePromise == 'function') {
nativeThen = NativePromise.prototype.then;
// wrap native Promise#then for native async functions
redefine(NativePromise.prototype, 'then', function then(onFulfilled, onRejected) {
var that = this;
return new PromiseConstructor(function (resolve, reject) {
nativeThen.call(that, resolve, reject);
}).then(onFulfilled, onRejected);
});
// wrap fetch result
if (typeof $fetch == 'function') $({ global: true, enumerable: true, forced: true }, {
// eslint-disable-next-line no-unused-vars
fetch: function fetch(input) {
return promiseResolve(PromiseConstructor, $fetch.apply(global, arguments));
}
});
}
}
$({ global: true, wrap: true, forced: FORCED }, {
Promise: PromiseConstructor
});
setToStringTag(PromiseConstructor, PROMISE, false, true);
setSpecies(PROMISE);
PromiseWrapper = path[PROMISE];
// statics
$({ target: PROMISE, stat: true, forced: FORCED }, {
// `Promise.reject` method
// https://tc39.github.io/ecma262/#sec-promise.reject
reject: function reject(r) {
var capability = newPromiseCapability(this);
capability.reject.call(undefined, r);
return capability.promise;
}
});
$({ target: PROMISE, stat: true, forced: IS_PURE || FORCED }, {
// `Promise.resolve` method
// https://tc39.github.io/ecma262/#sec-promise.resolve
resolve: function resolve(x) {
return promiseResolve(IS_PURE && this === PromiseWrapper ? PromiseConstructor : this, x);
}
});
$({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {
// `Promise.all` method
// https://tc39.github.io/ecma262/#sec-promise.all
all: function all(iterable) {
var C = this;
var capability = newPromiseCapability(C);
var resolve = capability.resolve;
var reject = capability.reject;
var result = perform(function () {
var $promiseResolve = aFunction(C.resolve);
var values = [];
var counter = 0;
var remaining = 1;
iterate(iterable, function (promise) {
var index = counter++;
var alreadyCalled = false;
values.push(undefined);
remaining++;
$promiseResolve.call(C, promise).then(function (value) {
if (alreadyCalled) return;
alreadyCalled = true;
values[index] = value;
--remaining || resolve(values);
}, reject);
});
--remaining || resolve(values);
});
if (result.error) reject(result.value);
return capability.promise;
},
// `Promise.race` method
// https://tc39.github.io/ecma262/#sec-promise.race
race: function race(iterable) {
var C = this;
var capability = newPromiseCapability(C);
var reject = capability.reject;
var result = perform(function () {
var $promiseResolve = aFunction(C.resolve);
iterate(iterable, function (promise) {
$promiseResolve.call(C, promise).then(capability.resolve, reject);
});
});
if (result.error) reject(result.value);
return capability.promise;
}
});