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Просмотр файла: 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.
 * 
 */
"use strict";
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 return$(r) {
    return function Promise$_returner() {
        return r;
    };
}
function throw$(r) {
    return function Promise$_thrower() {
        throw r;
    };
}
function promisedFinally(ret, reasonOrValue, isFulfilled) {
    var then;
    if (wrapsPrimitiveReceiver && isPrimitive(reasonOrValue)) {
        then = isFulfilled ? return$(reasonOrValue) : throw$(reasonOrValue);
    }
    else {
        then = isFulfilled ? returnThis : throwThis;
    }
    return ret._then(then, thrower, void 0, reasonOrValue, void 0);
}

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, void 0);
        if (maybePromise instanceof Promise) {
            return promisedFinally(maybePromise, reasonOrValue,
                                    promise.isFulfilled());
        }
    }

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

function tapHandler(value) {
    var promise = this.promise;
    var handler = this.handler;

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

    if (ret !== void 0) {
        var maybePromise = Promise._cast(ret, void 0);
        if (maybePromise instanceof Promise) {
            return promisedFinally(maybePromise, value, true);
        }
    }
    return value;
}

Promise.prototype._passThroughHandler =
function Promise$_passThroughHandler(handler, isFinally) {
    if (typeof handler !== "function") return this.then();

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

    return this._then(
            isFinally ? finallyHandler : tapHandler,
            isFinally ? finallyHandler : void 0, void 0,
            promiseAndHandler, void 0);
};

Promise.prototype.lastly =
Promise.prototype["finally"] = function Promise$finally(handler) {
    return this._passThroughHandler(handler, true);
};

Promise.prototype.tap = function Promise$tap(handler) {
    return this._passThroughHandler(handler, false);
};
};

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