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node_modules/rxjs/_esm5/internal/operators/expand.js

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+/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */
+import * as tslib_1 from "tslib";
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+export function expand(project, concurrent, scheduler) {
+    if (concurrent === void 0) {
+        concurrent = Number.POSITIVE_INFINITY;
+    }
+    if (scheduler === void 0) {
+        scheduler = undefined;
+    }
+    concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
+    return function (source) { return source.lift(new ExpandOperator(project, concurrent, scheduler)); };
+}
+var ExpandOperator = /*@__PURE__*/ (function () {
+    function ExpandOperator(project, concurrent, scheduler) {
+        this.project = project;
+        this.concurrent = concurrent;
+        this.scheduler = scheduler;
+    }
+    ExpandOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler));
+    };
+    return ExpandOperator;
+}());
+export { ExpandOperator };
+var ExpandSubscriber = /*@__PURE__*/ (function (_super) {
+    tslib_1.__extends(ExpandSubscriber, _super);
+    function ExpandSubscriber(destination, project, concurrent, scheduler) {
+        var _this = _super.call(this, destination) || this;
+        _this.project = project;
+        _this.concurrent = concurrent;
+        _this.scheduler = scheduler;
+        _this.index = 0;
+        _this.active = 0;
+        _this.hasCompleted = false;
+        if (concurrent < Number.POSITIVE_INFINITY) {
+            _this.buffer = [];
+        }
+        return _this;
+    }
+    ExpandSubscriber.dispatch = function (arg) {
+        var subscriber = arg.subscriber, result = arg.result, value = arg.value, index = arg.index;
+        subscriber.subscribeToProjection(result, value, index);
+    };
+    ExpandSubscriber.prototype._next = function (value) {
+        var destination = this.destination;
+        if (destination.closed) {
+            this._complete();
+            return;
+        }
+        var index = this.index++;
+        if (this.active < this.concurrent) {
+            destination.next(value);
+            try {
+                var project = this.project;
+                var result = project(value, index);
+                if (!this.scheduler) {
+                    this.subscribeToProjection(result, value, index);
+                }
+                else {
+                    var state = { subscriber: this, result: result, value: value, index: index };
+                    var destination_1 = this.destination;
+                    destination_1.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state));
+                }
+            }
+            catch (e) {
+                destination.error(e);
+            }
+        }
+        else {
+            this.buffer.push(value);
+        }
+    };
+    ExpandSubscriber.prototype.subscribeToProjection = function (result, value, index) {
+        this.active++;
+        var destination = this.destination;
+        destination.add(subscribeToResult(this, result, value, index));
+    };
+    ExpandSubscriber.prototype._complete = function () {
+        this.hasCompleted = true;
+        if (this.hasCompleted && this.active === 0) {
+            this.destination.complete();
+        }
+        this.unsubscribe();
+    };
+    ExpandSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this._next(innerValue);
+    };
+    ExpandSubscriber.prototype.notifyComplete = function (innerSub) {
+        var buffer = this.buffer;
+        var destination = this.destination;
+        destination.remove(innerSub);
+        this.active--;
+        if (buffer && buffer.length > 0) {
+            this._next(buffer.shift());
+        }
+        if (this.hasCompleted && this.active === 0) {
+            this.destination.complete();
+        }
+    };
+    return ExpandSubscriber;
+}(OuterSubscriber));
+export { ExpandSubscriber };
+//# sourceMappingURL=expand.js.map