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Просмотр файла: reduce.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, Promise$_CreatePromiseArray,
    PromiseArray, apiRejection, INTERNAL) {

function Reduction(callback, index, accum, items, receiver) {
    this.promise = new Promise(INTERNAL);
    this.index = index;
    this.length = items.length;
    this.items = items;
    this.callback = callback;
    this.receiver = receiver;
    this.accum = accum;
}

Reduction.prototype.reject = function Reduction$reject(e) {
    this.promise._reject(e);
};

Reduction.prototype.fulfill = function Reduction$fulfill(value, index) {
    this.accum = value;
    this.index = index + 1;
    this.iterate();
};

Reduction.prototype.iterate = function Reduction$iterate() {
    var i = this.index;
    var len = this.length;
    var items = this.items;
    var result = this.accum;
    var receiver = this.receiver;
    var callback = this.callback;

    for (; i < len; ++i) {
        result = callback.call(receiver, result, items[i], i, len);
        result = Promise._cast(result, void 0);

        if (result instanceof Promise) {
            result._then(
                this.fulfill, this.reject, void 0, this, i);
            return;
        }
    }
    this.promise._fulfill(result);
};

function Promise$_reducer(fulfilleds, initialValue) {
    var fn = this;
    var receiver = void 0;
    if (typeof fn !== "function")  {
        receiver = fn.receiver;
        fn = fn.fn;
    }
    var len = fulfilleds.length;
    var accum = void 0;
    var startIndex = 0;

    if (initialValue !== void 0) {
        accum = initialValue;
        startIndex = 0;
    }
    else {
        startIndex = 1;
        if (len > 0) accum = fulfilleds[0];
    }
    var i = startIndex;

    if (i >= len) {
        return accum;
    }

    var reduction = new Reduction(fn, i, accum, fulfilleds, receiver);
    reduction.iterate();
    return reduction.promise;
}

function Promise$_unpackReducer(fulfilleds) {
    var fn = this.fn;
    var initialValue = this.initialValue;
    return Promise$_reducer.call(fn, fulfilleds, initialValue);
}

function Promise$_slowReduce(
    promises, fn, initialValue, useBound) {
    return initialValue._then(function(initialValue) {
        return Promise$_Reduce(
            promises, fn, initialValue, useBound);
    }, void 0, void 0, void 0, void 0);
}

function Promise$_Reduce(promises, fn, initialValue, useBound) {
    if (typeof fn !== "function") {
        return apiRejection("fn must be a function");
    }

    if (useBound === true && promises._isBound()) {
        fn = {
            fn: fn,
            receiver: promises._boundTo
        };
    }

    if (initialValue !== void 0) {
        if (initialValue instanceof Promise) {
            if (initialValue.isFulfilled()) {
                initialValue = initialValue._settledValue;
            }
            else {
                return Promise$_slowReduce(promises,
                    fn, initialValue, useBound);
            }
        }

        return Promise$_CreatePromiseArray(promises, PromiseArray,
            useBound === true && promises._isBound()
                ? promises._boundTo
                : void 0)
            .promise()
            ._then(Promise$_unpackReducer, void 0, void 0, {
                fn: fn,
                initialValue: initialValue
            }, void 0);
    }
    return Promise$_CreatePromiseArray(promises, PromiseArray,
            useBound === true && promises._isBound()
                ? promises._boundTo
                : void 0).promise()
        ._then(Promise$_reducer, void 0, void 0, fn, void 0);
}


Promise.reduce = function Promise$Reduce(promises, fn, initialValue) {
    return Promise$_Reduce(promises, fn, initialValue, false);
};

Promise.prototype.reduce = function Promise$reduce(fn, initialValue) {
    return Promise$_Reduce(this, fn, initialValue, true);
};
};

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