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node_modules/rxjs/_esm2015/operators/windowToggle.js

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+import { Subject } from '../Subject';
+import { Subscription } from '../Subscription';
+import { tryCatch } from '../util/tryCatch';
+import { errorObject } from '../util/errorObject';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+/**
+ * Branch out the source Observable values as a nested Observable starting from
+ * an emission from `openings` and ending when the output of `closingSelector`
+ * emits.
+ *
+ * <span class="informal">It's like {@link bufferToggle}, but emits a nested
+ * Observable instead of an array.</span>
+ *
+ * <img src="./img/windowToggle.png" width="100%">
+ *
+ * Returns an Observable that emits windows of items it collects from the source
+ * Observable. The output Observable emits windows that contain those items
+ * emitted by the source Observable between the time when the `openings`
+ * Observable emits an item and when the Observable returned by
+ * `closingSelector` emits an item.
+ *
+ * @example <caption>Every other second, emit the click events from the next 500ms</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var openings = Rx.Observable.interval(1000);
+ * var result = clicks.windowToggle(openings, i =>
+ *   i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()
+ * ).mergeAll();
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link window}
+ * @see {@link windowCount}
+ * @see {@link windowTime}
+ * @see {@link windowWhen}
+ * @see {@link bufferToggle}
+ *
+ * @param {Observable<O>} openings An observable of notifications to start new
+ * windows.
+ * @param {function(value: O): Observable} closingSelector A function that takes
+ * the value emitted by the `openings` observable and returns an Observable,
+ * which, when it emits (either `next` or `complete`), signals that the
+ * associated window should complete.
+ * @return {Observable<Observable<T>>} An observable of windows, which in turn
+ * are Observables.
+ * @method windowToggle
+ * @owner Observable
+ */
+export function windowToggle(openings, closingSelector) {
+    return (source) => source.lift(new WindowToggleOperator(openings, closingSelector));
+}
+class WindowToggleOperator {
+    constructor(openings, closingSelector) {
+        this.openings = openings;
+        this.closingSelector = closingSelector;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new WindowToggleSubscriber(subscriber, this.openings, this.closingSelector));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class WindowToggleSubscriber extends OuterSubscriber {
+    constructor(destination, openings, closingSelector) {
+        super(destination);
+        this.openings = openings;
+        this.closingSelector = closingSelector;
+        this.contexts = [];
+        this.add(this.openSubscription = subscribeToResult(this, openings, openings));
+    }
+    _next(value) {
+        const { contexts } = this;
+        if (contexts) {
+            const len = contexts.length;
+            for (let i = 0; i < len; i++) {
+                contexts[i].window.next(value);
+            }
+        }
+    }
+    _error(err) {
+        const { contexts } = this;
+        this.contexts = null;
+        if (contexts) {
+            const len = contexts.length;
+            let index = -1;
+            while (++index < len) {
+                const context = contexts[index];
+                context.window.error(err);
+                context.subscription.unsubscribe();
+            }
+        }
+        super._error(err);
+    }
+    _complete() {
+        const { contexts } = this;
+        this.contexts = null;
+        if (contexts) {
+            const len = contexts.length;
+            let index = -1;
+            while (++index < len) {
+                const context = contexts[index];
+                context.window.complete();
+                context.subscription.unsubscribe();
+            }
+        }
+        super._complete();
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        const { contexts } = this;
+        this.contexts = null;
+        if (contexts) {
+            const len = contexts.length;
+            let index = -1;
+            while (++index < len) {
+                const context = contexts[index];
+                context.window.unsubscribe();
+                context.subscription.unsubscribe();
+            }
+        }
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        if (outerValue === this.openings) {
+            const { closingSelector } = this;
+            const closingNotifier = tryCatch(closingSelector)(innerValue);
+            if (closingNotifier === errorObject) {
+                return this.error(errorObject.e);
+            }
+            else {
+                const window = new Subject();
+                const subscription = new Subscription();
+                const context = { window, subscription };
+                this.contexts.push(context);
+                const innerSubscription = subscribeToResult(this, closingNotifier, context);
+                if (innerSubscription.closed) {
+                    this.closeWindow(this.contexts.length - 1);
+                }
+                else {
+                    innerSubscription.context = context;
+                    subscription.add(innerSubscription);
+                }
+                this.destination.next(window);
+            }
+        }
+        else {
+            this.closeWindow(this.contexts.indexOf(outerValue));
+        }
+    }
+    notifyError(err) {
+        this.error(err);
+    }
+    notifyComplete(inner) {
+        if (inner !== this.openSubscription) {
+            this.closeWindow(this.contexts.indexOf(inner.context));
+        }
+    }
+    closeWindow(index) {
+        if (index === -1) {
+            return;
+        }
+        const { contexts } = this;
+        const context = contexts[index];
+        const { window, subscription } = context;
+        contexts.splice(index, 1);
+        window.complete();
+        subscription.unsubscribe();
+    }
+}
+//# sourceMappingURL=windowToggle.js.map