node_modules/bluebird/js/zalgo/finally.js

/**
 * Copyright (c) 2014 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.
 * 
 */
module.exports = function(Promise, NEXT_FILTER) {
    var util = require("./util.js");
    var wrapsPrimitiveReceiver = util.wrapsPrimitiveReceiver;
    var isPrimitive = util.isPrimitive;
    var thrower = util.thrower;


    function returnThis() {
        return this;
    }
    function throwThis() {
        throw this;
    }
    function makeReturner(r) {
        return function Promise$_returner() {
            return r;
        };
    }
    function makeThrower(r) {
        return function Promise$_thrower() {
            throw r;
        };
    }
    function promisedFinally(ret, reasonOrValue, isFulfilled) {
        var useConstantFunction =
                        wrapsPrimitiveReceiver && isPrimitive(reasonOrValue);

        if (isFulfilled) {
            return ret._then(
                useConstantFunction
                    ? returnThis
                    : makeReturner(reasonOrValue),
                thrower, void 0, reasonOrValue, void 0, promisedFinally);
        }
        else {
            return ret._then(
                useConstantFunction
                    ? throwThis
                    : makeThrower(reasonOrValue),
                thrower, void 0, reasonOrValue, void 0, promisedFinally);
        }
    }

    function finallyHandler(reasonOrValue) {
        var promise = this.promise;
        var handler = this.handler;

        var ret = promise._isBound()
                        ? handler.call(promise._boundTo)
                        : handler();

        if (ret !== void 0) {
            var maybePromise = Promise._cast(ret, finallyHandler, void 0);
            if (Promise.is(maybePromise)) {
                return promisedFinally(maybePromise, reasonOrValue,
                                        promise.isFulfilled());
            }
        }

        if (promise.isRejected()) {
            NEXT_FILTER.e = reasonOrValue;
            return NEXT_FILTER;
        }
        else {
            return reasonOrValue;
        }
    }

    Promise.prototype.lastly = Promise.prototype["finally"] =
    function Promise$finally(handler) {
        if (typeof handler !== "function") return this.then();

        var promiseAndHandler = {
            promise: this,
            handler: handler
        };

        return this._then(finallyHandler, finallyHandler, void 0,
                promiseAndHandler, void 0, this.lastly);
    };
};