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promise.js
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promise.js
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/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/*
Any copyright to this file is released to the Public Domain.
In case this is not possible, this file is also licensed under the Unlicense: https://unlicense.org/
*/
/* eslint no-extend-native: "off", callback-return: "off" */
// Notes by Peter O.:
// 2016-12-14: This is a polyfill for Promises, and it's only used
// when the environment doesn't support promises
// already, so the no-extend-native rule is disabled for this file.
// The callback-return rule is also disabled here in order
// to communicate the callback's return value properly.
// 2015-03-09: This file was taken
// from https://github.com/ondras/promise/.
if (typeof window !== "undefined" && window !== null && !(typeof window.Promise !== "undefined" && window.Promise !== null)) {
/**
* A promise holds a value to be resolved in the future.<p>
* This class is a "polyfill" for the standard <code>Promise</code>
* class; it is only used when the running JavaScript environment
* doesn't support or include a <code>Promise</code> class
* on its own.
* @constructor
* @alias Promise
* @param {Function} [resolver] Function that takes
* two arguments: the first is a function to call when
* resolving the promise, and the second is a function
* to call when rejecting the promise.
*/
var Promise = function(resolver) {
this._state = 0; /* 0 = pending, 1 = fulfilled, 2 = rejected */
this._value = null; /* fulfillment / rejection value */
this._timeout = null;
this._cb = {
"fulfilled": [],
"rejected": []
};
this._thenPromises = []; /* promises returned by then() */
if (resolver) {
this._invokeResolver(resolver);
}
};
/**
* Returns a promise that resolves.
* @param {Object} value The value associated with the promise.
* @returns {Promise} A promise that resolves and takes the given value
* as its argument.
* @method
*/
Promise.resolve = function(value) {
return new this(function(resolve) {
resolve(value);
});
};
/**
* Returns a promise that is rejected.
* @param {Object} reason The value associated with the promise.
* @returns {Promise} A promise that is rejected and takes the given value
* as its argument.
* @method
*/
Promise.reject = function(reason) {
return new this(function(resolve, reject) {
reject(reason);
});
};
/**
* Wait for all these promises to complete. One failed => this fails too.
* @param {Array<Promise>} all An array of promises.
* @returns {Promise} A promise that is resolved when all promises have resolved.
* @method
*/
Promise.all = Promise.when = function(all) {
return new this(function(resolve, reject) {
var counter = 0;
var results = [];
all.forEach(function(promise, index) {
counter++;
promise.then(function(result) {
results[index] = result;
counter--;
if (!counter) {
resolve(results);
}
}, function(reason) {
counter = 1 / 0;
reject(reason);
});
});
});
};
/**
* Creates a promise that resolves or is rejected when one of those promises
* resolves or is rejected.
* @param {Array<Promise>} all An array of promises.
* @returns {Promise} A promise that resolves or is rejected according to
* the first promise that resolves or is rejected. It will receive the
* value associated with that promise.
* @method
*/
Promise.race = function(all) {
return new this(function(resolve, reject) {
all.forEach(function(promise) {
promise.then(resolve, reject);
});
});
};
/**
* Creates a promise that calls a function depending on whether
* this promise resolves or is rejected.
* @suppress {checkTypes}
* @param {Function} onFulfilled To be called once this promise gets fulfilled
* @param {Function} [onRejected] To be called once this promise gets rejected
* @returns {Promise} A promise.
* @memberof Promise#
*/
Promise.prototype.then = function(onFulfilled, onRejected) {
this._cb.fulfilled.push(onFulfilled);
this._cb.rejected.push(onRejected);
var thenPromise = new Promise(null);
this._thenPromises.push(thenPromise);
if (this._state > 0) {
this._schedule();
}
/* 2.2.7. then must return a promise. */
return thenPromise;
};
/** @ignore */
Promise.prototype.fulfill = function(value) {
if (this._state !== 0) {
return this;
}
this._state = 1;
this._value = value;
if (this._thenPromises.length) {
this._schedule();
}
return this;
};
/** @ignore */
Promise.prototype.reject = function(value) {
if (this._state !== 0) {
return this;
}
this._state = 2;
this._value = value;
if (this._thenPromises.length) {
this._schedule();
}
return this;
};
/** @ignore */
Promise.prototype.resolve = function(x) {
/* 2.3.1. If promise and x refer to the same object, reject promise with a TypeError as the reason. */
if (x === this) {
this.reject(new TypeError("Promise resolved by its own instance"));
return;
}
/* 2.3.2. If x is a promise, adopt its state */
if (x instanceof this.constructor) {
x.chain(this);
return;
}
var then;
/* 2.3.3. Otherwise, if x is an object or function, */
if (typeof x !== "undefined" && x !== null && (typeof x === "object" || typeof x === "function")) {
try {
then = x.then;
} catch (e) {
/* 2.3.3.2. If retrieving the property x.then results in a thrown exception e, reject promise with e as the reason. */
this.reject(e);
return;
}
if (typeof then === "function") {
/* 2.3.3.3. If then is a function, call it */
var called = false;
var resolvePromise = function(y) {
/* 2.3.3.3.1. If/when resolvePromise is called with a value y, run [[Resolve]](promise, y). */
if (called) {
return;
}
called = true;
this.resolve(y);
};
var rejectPromise = function(r) {
/* 2.3.3.3.2. If/when rejectPromise is called with a reason r, reject promise with r. */
if (called) {
return;
}
called = true;
this.reject(r);
};
try {
then.call(x, resolvePromise.bind(this), rejectPromise.bind(this));
} catch (e) { /* 2.3.3.3.4. If calling then throws an exception e, */
/* 2.3.3.3.4.1. If resolvePromise or rejectPromise have been called, ignore it. */
if (called) {
return;
}
/* 2.3.3.3.4.2. Otherwise, reject promise with e as the reason. */
this.reject(e);
}
} else {
/* 2.3.3.4 If then is not a function, fulfill promise with x. */
this.fulfill(x);
}
return;
}
/* 2.3.4. If x is not an object or function, fulfill promise with x. */
this.fulfill(x);
};
/** @ignore */
Promise.prototype.chain = function(promise) {
var resolve = function(value) {
promise.resolve(value);
};
var reject = function(value) {
promise.reject(value);
};
return this.then(resolve, reject);
};
/**
* Creates a promise that calls a function if
* this promise is rejected.
* @param {Function} onRejected To be called once this promise gets rejected
* @returns {Promise} A promise.
* @memberof Promise#
*/
Promise.prototype.catch = function(onRejected) {
return this.then(null, onRejected);
};
/** @ignore */
Promise.prototype._schedule = function() {
if (this._timeout) {
return;
} /* resolution already scheduled */
this._timeout = setTimeout(this._processQueue.bind(this), 0);
};
/** @ignore */
Promise.prototype._processQueue = function() {
this._timeout = null;
while (this._thenPromises.length) {
var onFulfilled = this._cb.fulfilled.shift();
var onRejected = this._cb.rejected.shift();
this._executeCallback(this._state === 1 ? onFulfilled : onRejected);
}
};
/** @ignore */
Promise.prototype._executeCallback = function(cb) {
var thenPromise = this._thenPromises.shift();
if (typeof cb !== "function") {
if (this._state === 1) {
/* 2.2.7.3. If onFulfilled is not a function and promise1 is fulfilled, promise2 must be fulfilled with the same value. */
thenPromise.fulfill(this._value);
} else {
/* 2.2.7.4. If onRejected is not a function and promise1 is rejected, promise2 must be rejected with the same reason. */
thenPromise.reject(this._value);
}
return;
}
try {
var x = cb(this._value);
/* 2.2.7.1. If either onFulfilled or onRejected returns a value x, run the Promise Resolution Procedure [[Resolve]](promise2, x). */
thenPromise.resolve(x);
return x;
} catch (e) {
/* 2.2.7.2. If either onFulfilled or onRejected throws an exception, promise2 must be rejected with the thrown exception as the reason. */
thenPromise.reject(e);
}
};
/** @ignore */
Promise.prototype._invokeResolver = function(resolver) {
try {
resolver(this.resolve.bind(this), this.reject.bind(this));
} catch (e) {
this.reject(e);
}
};
if(typeof window !== "undefined" && window !== null) {
/** @suppress {checkTypes}
* @ignore */function promfunc() {
window.Promise = Promise;
}
promfunc();
}
}