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node_modules/rxjs/src/internal/operators/bufferToggle.ts

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+import { Subscription } from '../Subscription';
+import { OperatorFunction, ObservableInput } from '../types';
+import { operate } from '../util/lift';
+import { innerFrom } from '../observable/innerFrom';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+import { noop } from '../util/noop';
+import { arrRemove } from '../util/arrRemove';
+
+/**
+ * Buffers the source Observable values starting from an emission from
+ * `openings` and ending when the output of `closingSelector` emits.
+ *
+ * <span class="informal">Collects values from the past as an array. Starts
+ * collecting only when `opening` emits, and calls the `closingSelector`
+ * function to get an Observable that tells when to close the buffer.</span>
+ *
+ * ![](bufferToggle.png)
+ *
+ * Buffers values from the source by opening the buffer via signals from an
+ * Observable provided to `openings`, and closing and sending the buffers when
+ * a Subscribable or Promise returned by the `closingSelector` function emits.
+ *
+ * ## Example
+ *
+ * Every other second, emit the click events from the next 500ms
+ *
+ * ```ts
+ * import { fromEvent, interval, bufferToggle, EMPTY } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const openings = interval(1000);
+ * const buffered = clicks.pipe(bufferToggle(openings, i =>
+ *   i % 2 ? interval(500) : EMPTY
+ * ));
+ * buffered.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link buffer}
+ * @see {@link bufferCount}
+ * @see {@link bufferTime}
+ * @see {@link bufferWhen}
+ * @see {@link windowToggle}
+ *
+ * @param openings A Subscribable or Promise of notifications to start new
+ * buffers.
+ * @param closingSelector A function that takes
+ * the value emitted by the `openings` observable and returns a Subscribable or Promise,
+ * which, when it emits, signals that the associated buffer should be emitted
+ * and cleared.
+ * @return A function that returns an Observable of arrays of buffered values.
+ */
+export function bufferToggle<T, O>(
+  openings: ObservableInput<O>,
+  closingSelector: (value: O) => ObservableInput<any>
+): OperatorFunction<T, T[]> {
+  return operate((source, subscriber) => {
+    const buffers: T[][] = [];
+
+    // Subscribe to the openings notifier first
+    innerFrom(openings).subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (openValue) => {
+          const buffer: T[] = [];
+          buffers.push(buffer);
+          // We use this composite subscription, so that
+          // when the closing notifier emits, we can tear it down.
+          const closingSubscription = new Subscription();
+
+          const emitBuffer = () => {
+            arrRemove(buffers, buffer);
+            subscriber.next(buffer);
+            closingSubscription.unsubscribe();
+          };
+
+          // The line below will add the subscription to the parent subscriber *and* the closing subscription.
+          closingSubscription.add(innerFrom(closingSelector(openValue)).subscribe(createOperatorSubscriber(subscriber, emitBuffer, noop)));
+        },
+        noop
+      )
+    );
+
+    source.subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (value) => {
+          // Value from our source. Add it to all pending buffers.
+          for (const buffer of buffers) {
+            buffer.push(value);
+          }
+        },
+        () => {
+          // Source complete. Emit all pending buffers.
+          while (buffers.length > 0) {
+            subscriber.next(buffers.shift()!);
+          }
+          subscriber.complete();
+        }
+      )
+    );
+  });
+}