ix/asynciterable/operators/intersect.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __asyncValues, __await, __awaiter } from "tslib";
import { AsyncIterableX } from '../asynciterablex.mjs';
import { arrayIndexOfAsync } from '../../util/arrayindexof.mjs';
import { comparerAsync } from '../../util/comparer.mjs';
import { wrapWithAbort } from './withabort.mjs';
import { throwIfAborted } from '../../aborterror.mjs';
function arrayRemove(array, item, comparer, signal) {
    return __awaiter(this, void 0, void 0, function* () {
        throwIfAborted(signal);
        const idx = yield arrayIndexOfAsync(array, item, comparer);
        if (idx === -1) {
            return false;
        }
        array.splice(idx, 1);
        return true;
    });
}
/** @ignore */
export class IntersectAsyncIterable extends AsyncIterableX {
    constructor(first, second, comparer) {
        super();
        this._first = first;
        this._second = second;
        this._comparer = comparer;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d, _e, e_2, _f, _g;
            const map = [];
            try {
                for (var _h = true, _j = __asyncValues(wrapWithAbort(this._second, signal)), _k; _k = yield __await(_j.next()), _b = _k.done, !_b; _h = true) {
                    _d = _k.value;
                    _h = false;
                    const secondItem = _d;
                    map.push(secondItem);
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (!_h && !_b && (_c = _j.return)) yield __await(_c.call(_j));
                }
                finally { if (e_1) throw e_1.error; }
            }
            try {
                for (var _l = true, _m = __asyncValues(wrapWithAbort(this._first, signal)), _o; _o = yield __await(_m.next()), _e = _o.done, !_e; _l = true) {
                    _g = _o.value;
                    _l = false;
                    const firstItem = _g;
                    if (yield __await(arrayRemove(map, firstItem, this._comparer, signal))) {
                        yield yield __await(firstItem);
                    }
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (!_l && !_e && (_f = _m.return)) yield __await(_f.call(_m));
                }
                finally { if (e_2) throw e_2.error; }
            }
        });
    }
}
/**
 * Produces the set intersection of two async-iterable sequences.
 *
 * @template TSource The type of the elements of the input sequences.
 * @param {AsyncIterable<TSource>} second An async-iterable sequence whose distinct elements that also
 * appear in the first sequence will be returned.
 * @param {((x: TSource, y: TSource) => boolean | Promise<boolean>)} [comparer=comparerAsync] An equality comparer to compare values.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An operator that returns a sequence that contains the elements that form the set
 * intersection of two sequences.
 */
export function intersect(second, comparer = comparerAsync) {
    return function intersectOperatorFunction(first) {
        return new IntersectAsyncIterable(first, second, comparer);
    };
}

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