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

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+/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber,_map,_observable_from PURE_IMPORTS_END */
+import * as tslib_1 from "tslib";
+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { map } from './map';
+import { from } from '../observable/from';
+export function mergeMap(project, resultSelector, concurrent) {
+    if (concurrent === void 0) {
+        concurrent = Number.POSITIVE_INFINITY;
+    }
+    if (typeof resultSelector === 'function') {
+        return function (source) { return source.pipe(mergeMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); }, concurrent)); };
+    }
+    else if (typeof resultSelector === 'number') {
+        concurrent = resultSelector;
+    }
+    return function (source) { return source.lift(new MergeMapOperator(project, concurrent)); };
+}
+var MergeMapOperator = /*@__PURE__*/ (function () {
+    function MergeMapOperator(project, concurrent) {
+        if (concurrent === void 0) {
+            concurrent = Number.POSITIVE_INFINITY;
+        }
+        this.project = project;
+        this.concurrent = concurrent;
+    }
+    MergeMapOperator.prototype.call = function (observer, source) {
+        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));
+    };
+    return MergeMapOperator;
+}());
+export { MergeMapOperator };
+var MergeMapSubscriber = /*@__PURE__*/ (function (_super) {
+    tslib_1.__extends(MergeMapSubscriber, _super);
+    function MergeMapSubscriber(destination, project, concurrent) {
+        if (concurrent === void 0) {
+            concurrent = Number.POSITIVE_INFINITY;
+        }
+        var _this = _super.call(this, destination) || this;
+        _this.project = project;
+        _this.concurrent = concurrent;
+        _this.hasCompleted = false;
+        _this.buffer = [];
+        _this.active = 0;
+        _this.index = 0;
+        return _this;
+    }
+    MergeMapSubscriber.prototype._next = function (value) {
+        if (this.active < this.concurrent) {
+            this._tryNext(value);
+        }
+        else {
+            this.buffer.push(value);
+        }
+    };
+    MergeMapSubscriber.prototype._tryNext = function (value) {
+        var result;
+        var index = this.index++;
+        try {
+            result = this.project(value, index);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.active++;
+        this._innerSub(result, value, index);
+    };
+    MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {
+        var innerSubscriber = new InnerSubscriber(this, value, index);
+        var destination = this.destination;
+        destination.add(innerSubscriber);
+        var innerSubscription = subscribeToResult(this, ish, undefined, undefined, innerSubscriber);
+        if (innerSubscription !== innerSubscriber) {
+            destination.add(innerSubscription);
+        }
+    };
+    MergeMapSubscriber.prototype._complete = function () {
+        this.hasCompleted = true;
+        if (this.active === 0 && this.buffer.length === 0) {
+            this.destination.complete();
+        }
+        this.unsubscribe();
+    };
+    MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this.destination.next(innerValue);
+    };
+    MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {
+        var buffer = this.buffer;
+        this.remove(innerSub);
+        this.active--;
+        if (buffer.length > 0) {
+            this._next(buffer.shift());
+        }
+        else if (this.active === 0 && this.hasCompleted) {
+            this.destination.complete();
+        }
+    };
+    return MergeMapSubscriber;
+}(OuterSubscriber));
+export { MergeMapSubscriber };
+//# sourceMappingURL=mergeMap.js.map