update

node_modules/rxjs/_esm2015/operators/mergeMap.js

@@ -0,0 +1,158 @@
+import { subscribeToResult } from '../util/subscribeToResult';
+import { OuterSubscriber } from '../OuterSubscriber';
+/* tslint:enable:max-line-length */
+/**
+ * Projects each source value to an Observable which is merged in the output
+ * Observable.
+ *
+ * <span class="informal">Maps each value to an Observable, then flattens all of
+ * these inner Observables using {@link mergeAll}.</span>
+ *
+ * <img src="./img/mergeMap.png" width="100%">
+ *
+ * Returns an Observable that emits items based on applying a function that you
+ * supply to each item emitted by the source Observable, where that function
+ * returns an Observable, and then merging those resulting Observables and
+ * emitting the results of this merger.
+ *
+ * @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
+ * var letters = Rx.Observable.of('a', 'b', 'c');
+ * var result = letters.mergeMap(x =>
+ *   Rx.Observable.interval(1000).map(i => x+i)
+ * );
+ * result.subscribe(x => console.log(x));
+ *
+ * // Results in the following:
+ * // a0
+ * // b0
+ * // c0
+ * // a1
+ * // b1
+ * // c1
+ * // continues to list a,b,c with respective ascending integers
+ *
+ * @see {@link concatMap}
+ * @see {@link exhaustMap}
+ * @see {@link merge}
+ * @see {@link mergeAll}
+ * @see {@link mergeMapTo}
+ * @see {@link mergeScan}
+ * @see {@link switchMap}
+ *
+ * @param {function(value: T, ?index: number): ObservableInput} project A function
+ * that, when applied to an item emitted by the source Observable, returns an
+ * Observable.
+ * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
+ * A function to produce the value on the output Observable based on the values
+ * and the indices of the source (outer) emission and the inner Observable
+ * emission. The arguments passed to this function are:
+ * - `outerValue`: the value that came from the source
+ * - `innerValue`: the value that came from the projected Observable
+ * - `outerIndex`: the "index" of the value that came from the source
+ * - `innerIndex`: the "index" of the value from the projected Observable
+ * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
+ * Observables being subscribed to concurrently.
+ * @return {Observable} An Observable that emits the result of applying the
+ * projection function (and the optional `resultSelector`) to each item emitted
+ * by the source Observable and merging the results of the Observables obtained
+ * from this transformation.
+ * @method mergeMap
+ * @owner Observable
+ */
+export function mergeMap(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
+    return function mergeMapOperatorFunction(source) {
+        if (typeof resultSelector === 'number') {
+            concurrent = resultSelector;
+            resultSelector = null;
+        }
+        return source.lift(new MergeMapOperator(project, resultSelector, concurrent));
+    };
+}
+export class MergeMapOperator {
+    constructor(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
+        this.project = project;
+        this.resultSelector = resultSelector;
+        this.concurrent = concurrent;
+    }
+    call(observer, source) {
+        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.resultSelector, this.concurrent));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class MergeMapSubscriber extends OuterSubscriber {
+    constructor(destination, project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
+        super(destination);
+        this.project = project;
+        this.resultSelector = resultSelector;
+        this.concurrent = concurrent;
+        this.hasCompleted = false;
+        this.buffer = [];
+        this.active = 0;
+        this.index = 0;
+    }
+    _next(value) {
+        if (this.active < this.concurrent) {
+            this._tryNext(value);
+        }
+        else {
+            this.buffer.push(value);
+        }
+    }
+    _tryNext(value) {
+        let result;
+        const index = this.index++;
+        try {
+            result = this.project(value, index);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.active++;
+        this._innerSub(result, value, index);
+    }
+    _innerSub(ish, value, index) {
+        this.add(subscribeToResult(this, ish, value, index));
+    }
+    _complete() {
+        this.hasCompleted = true;
+        if (this.active === 0 && this.buffer.length === 0) {
+            this.destination.complete();
+        }
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        if (this.resultSelector) {
+            this._notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex);
+        }
+        else {
+            this.destination.next(innerValue);
+        }
+    }
+    _notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex) {
+        let result;
+        try {
+            result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
+        }
+        catch (err) {
+            this.destination.error(err);
+            return;
+        }
+        this.destination.next(result);
+    }
+    notifyComplete(innerSub) {
+        const 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();
+        }
+    }
+}
+//# sourceMappingURL=mergeMap.js.map