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node_modules/rxjs/_esm2015/operators/bufferCount.js

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+import { Subscriber } from '../Subscriber';
+/**
+ * Buffers the source Observable values until the size hits the maximum
+ * `bufferSize` given.
+ *
+ * <span class="informal">Collects values from the past as an array, and emits
+ * that array only when its size reaches `bufferSize`.</span>
+ *
+ * <img src="./img/bufferCount.png" width="100%">
+ *
+ * Buffers a number of values from the source Observable by `bufferSize` then
+ * emits the buffer and clears it, and starts a new buffer each
+ * `startBufferEvery` values. If `startBufferEvery` is not provided or is
+ * `null`, then new buffers are started immediately at the start of the source
+ * and when each buffer closes and is emitted.
+ *
+ * @example <caption>Emit the last two click events as an array</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var buffered = clicks.bufferCount(2);
+ * buffered.subscribe(x => console.log(x));
+ *
+ * @example <caption>On every click, emit the last two click events as an array</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var buffered = clicks.bufferCount(2, 1);
+ * buffered.subscribe(x => console.log(x));
+ *
+ * @see {@link buffer}
+ * @see {@link bufferTime}
+ * @see {@link bufferToggle}
+ * @see {@link bufferWhen}
+ * @see {@link pairwise}
+ * @see {@link windowCount}
+ *
+ * @param {number} bufferSize The maximum size of the buffer emitted.
+ * @param {number} [startBufferEvery] Interval at which to start a new buffer.
+ * For example if `startBufferEvery` is `2`, then a new buffer will be started
+ * on every other value from the source. A new buffer is started at the
+ * beginning of the source by default.
+ * @return {Observable<T[]>} An Observable of arrays of buffered values.
+ * @method bufferCount
+ * @owner Observable
+ */
+export function bufferCount(bufferSize, startBufferEvery = null) {
+    return function bufferCountOperatorFunction(source) {
+        return source.lift(new BufferCountOperator(bufferSize, startBufferEvery));
+    };
+}
+class BufferCountOperator {
+    constructor(bufferSize, startBufferEvery) {
+        this.bufferSize = bufferSize;
+        this.startBufferEvery = startBufferEvery;
+        if (!startBufferEvery || bufferSize === startBufferEvery) {
+            this.subscriberClass = BufferCountSubscriber;
+        }
+        else {
+            this.subscriberClass = BufferSkipCountSubscriber;
+        }
+    }
+    call(subscriber, source) {
+        return source.subscribe(new this.subscriberClass(subscriber, this.bufferSize, this.startBufferEvery));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class BufferCountSubscriber extends Subscriber {
+    constructor(destination, bufferSize) {
+        super(destination);
+        this.bufferSize = bufferSize;
+        this.buffer = [];
+    }
+    _next(value) {
+        const buffer = this.buffer;
+        buffer.push(value);
+        if (buffer.length == this.bufferSize) {
+            this.destination.next(buffer);
+            this.buffer = [];
+        }
+    }
+    _complete() {
+        const buffer = this.buffer;
+        if (buffer.length > 0) {
+            this.destination.next(buffer);
+        }
+        super._complete();
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class BufferSkipCountSubscriber extends Subscriber {
+    constructor(destination, bufferSize, startBufferEvery) {
+        super(destination);
+        this.bufferSize = bufferSize;
+        this.startBufferEvery = startBufferEvery;
+        this.buffers = [];
+        this.count = 0;
+    }
+    _next(value) {
+        const { bufferSize, startBufferEvery, buffers, count } = this;
+        this.count++;
+        if (count % startBufferEvery === 0) {
+            buffers.push([]);
+        }
+        for (let i = buffers.length; i--;) {
+            const buffer = buffers[i];
+            buffer.push(value);
+            if (buffer.length === bufferSize) {
+                buffers.splice(i, 1);
+                this.destination.next(buffer);
+            }
+        }
+    }
+    _complete() {
+        const { buffers, destination } = this;
+        while (buffers.length > 0) {
+            let buffer = buffers.shift();
+            if (buffer.length > 0) {
+                destination.next(buffer);
+            }
+        }
+        super._complete();
+    }
+}
+//# sourceMappingURL=bufferCount.js.map