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name : Subscription.js
 import { __read, __spreadArray, __values } from "tslib";
import { isFunction } from './util/isFunction';
import { UnsubscriptionError } from './util/UnsubscriptionError';
import { arrRemove } from './util/arrRemove';
var Subscription = (function () {
    function Subscription(initialTeardown) {
        this.initialTeardown = initialTeardown;
        this.closed = false;
        this._parentage = null;
        this._finalizers = null;
    }
    Subscription.prototype.unsubscribe = function () {
        var e_1, _a, e_2, _b;
        var errors;
        if (!this.closed) {
            this.closed = true;
            var _parentage = this._parentage;
            if (_parentage) {
                this._parentage = null;
                if (Array.isArray(_parentage)) {
                    try {
                        for (var _parentage_1 = __values(_parentage), _parentage_1_1 = _parentage_1.next(); !_parentage_1_1.done; _parentage_1_1 = _parentage_1.next()) {
                            var parent_1 = _parentage_1_1.value;
                            parent_1.remove(this);
                        }
                    }
                    catch (e_1_1) { e_1 = { error: e_1_1 }; }
                    finally {
                        try {
                            if (_parentage_1_1 && !_parentage_1_1.done && (_a = _parentage_1.return)) _a.call(_parentage_1);
                        }
                        finally { if (e_1) throw e_1.error; }
                    }
                }
                else {
                    _parentage.remove(this);
                }
            }
            var initialFinalizer = this.initialTeardown;
            if (isFunction(initialFinalizer)) {
                try {
                    initialFinalizer();
                }
                catch (e) {
                    errors = e instanceof UnsubscriptionError ? e.errors : [e];
                }
            }
            var _finalizers = this._finalizers;
            if (_finalizers) {
                this._finalizers = null;
                try {
                    for (var _finalizers_1 = __values(_finalizers), _finalizers_1_1 = _finalizers_1.next(); !_finalizers_1_1.done; _finalizers_1_1 = _finalizers_1.next()) {
                        var finalizer = _finalizers_1_1.value;
                        try {
                            execFinalizer(finalizer);
                        }
                        catch (err) {
                            errors = errors !== null && errors !== void 0 ? errors : [];
                            if (err instanceof UnsubscriptionError) {
                                errors = __spreadArray(__spreadArray([], __read(errors)), __read(err.errors));
                            }
                            else {
                                errors.push(err);
                            }
                        }
                    }
                }
                catch (e_2_1) { e_2 = { error: e_2_1 }; }
                finally {
                    try {
                        if (_finalizers_1_1 && !_finalizers_1_1.done && (_b = _finalizers_1.return)) _b.call(_finalizers_1);
                    }
                    finally { if (e_2) throw e_2.error; }
                }
            }
            if (errors) {
                throw new UnsubscriptionError(errors);
            }
        }
    };
    Subscription.prototype.add = function (teardown) {
        var _a;
        if (teardown && teardown !== this) {
            if (this.closed) {
                execFinalizer(teardown);
            }
            else {
                if (teardown instanceof Subscription) {
                    if (teardown.closed || teardown._hasParent(this)) {
                        return;
                    }
                    teardown._addParent(this);
                }
                (this._finalizers = (_a = this._finalizers) !== null && _a !== void 0 ? _a : []).push(teardown);
            }
        }
    };
    Subscription.prototype._hasParent = function (parent) {
        var _parentage = this._parentage;
        return _parentage === parent || (Array.isArray(_parentage) && _parentage.includes(parent));
    };
    Subscription.prototype._addParent = function (parent) {
        var _parentage = this._parentage;
        this._parentage = Array.isArray(_parentage) ? (_parentage.push(parent), _parentage) : _parentage ? [_parentage, parent] : parent;
    };
    Subscription.prototype._removeParent = function (parent) {
        var _parentage = this._parentage;
        if (_parentage === parent) {
            this._parentage = null;
        }
        else if (Array.isArray(_parentage)) {
            arrRemove(_parentage, parent);
        }
    };
    Subscription.prototype.remove = function (teardown) {
        var _finalizers = this._finalizers;
        _finalizers && arrRemove(_finalizers, teardown);
        if (teardown instanceof Subscription) {
            teardown._removeParent(this);
        }
    };
    Subscription.EMPTY = (function () {
        var empty = new Subscription();
        empty.closed = true;
        return empty;
    })();
    return Subscription;
}());
export { Subscription };
export var EMPTY_SUBSCRIPTION = Subscription.EMPTY;
export function isSubscription(value) {
    return (value instanceof Subscription ||
        (value && 'closed' in value && isFunction(value.remove) && isFunction(value.add) && isFunction(value.unsubscribe)));
}
function execFinalizer(finalizer) {
    if (isFunction(finalizer)) {
        finalizer();
    }
    else {
        finalizer.unsubscribe();
    }
}
//# sourceMappingURL=Subscription.js.map
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