bluebird/js/zalgo/promise_inspection.js

Full featured Promises/A+ implementation with exceptionally good performance

/**
 * Copyright (c) 2013 Petka Antonov
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:</p>
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
"use strict";
var TypeError = require( "./errors.js" ).TypeError;

function PromiseInspection( promise ) {
    if( promise !== void 0 ) {
        this._bitField = promise._bitField;
        this._resolvedValue = promise.isResolved()
            ? promise._resolvedValue
            : void 0;
    }
    else {
        this._bitField = 0;
        this._resolvedValue = void 0;
    }
}
PromiseInspection.prototype.isFulfilled =
function PromiseInspection$isFulfilled() {
    return ( this._bitField & 268435456 ) > 0;
};

PromiseInspection.prototype.isRejected =
function PromiseInspection$isRejected() {
    return ( this._bitField & 134217728 ) > 0;
};

PromiseInspection.prototype.isPending = function PromiseInspection$isPending() {
    return ( this._bitField & 402653184 ) === 0;
};

PromiseInspection.prototype.value = function PromiseInspection$value() {
    if( !this.isFulfilled() ) {
        throw new TypeError(
            "cannot get fulfillment value of a non-fulfilled promise");
    }
    return this._resolvedValue;
};

PromiseInspection.prototype.error = function PromiseInspection$error() {
    if( !this.isRejected() ) {
        throw new TypeError(
            "cannot get rejection reason of a non-rejected promise");
    }
    return this._resolvedValue;
};

module.exports = PromiseInspection;