import { fromArray } from './fromArray';
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import { isArray } from '../util/isArray';
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import { Subscriber } from '../Subscriber';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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import { iterator as Symbol_iterator } from '../../internal/symbol/iterator';
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export function zip(...observables) {
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const resultSelector = observables[observables.length - 1];
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if (typeof resultSelector === 'function') {
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observables.pop();
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}
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return fromArray(observables, undefined).lift(new ZipOperator(resultSelector));
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}
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export class ZipOperator {
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constructor(resultSelector) {
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this.resultSelector = resultSelector;
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}
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call(subscriber, source) {
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return source.subscribe(new ZipSubscriber(subscriber, this.resultSelector));
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}
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}
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export class ZipSubscriber extends Subscriber {
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constructor(destination, resultSelector, values = Object.create(null)) {
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super(destination);
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this.iterators = [];
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this.active = 0;
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this.resultSelector = (typeof resultSelector === 'function') ? resultSelector : null;
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this.values = values;
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}
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_next(value) {
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const iterators = this.iterators;
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if (isArray(value)) {
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iterators.push(new StaticArrayIterator(value));
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}
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else if (typeof value[Symbol_iterator] === 'function') {
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iterators.push(new StaticIterator(value[Symbol_iterator]()));
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}
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else {
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iterators.push(new ZipBufferIterator(this.destination, this, value));
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}
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}
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_complete() {
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const iterators = this.iterators;
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const len = iterators.length;
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this.unsubscribe();
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if (len === 0) {
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this.destination.complete();
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return;
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}
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this.active = len;
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for (let i = 0; i < len; i++) {
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let iterator = iterators[i];
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if (iterator.stillUnsubscribed) {
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const destination = this.destination;
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destination.add(iterator.subscribe(iterator, i));
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}
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else {
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this.active--;
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}
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}
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}
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notifyInactive() {
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this.active--;
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if (this.active === 0) {
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this.destination.complete();
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}
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}
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checkIterators() {
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const iterators = this.iterators;
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const len = iterators.length;
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const destination = this.destination;
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for (let i = 0; i < len; i++) {
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let iterator = iterators[i];
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if (typeof iterator.hasValue === 'function' && !iterator.hasValue()) {
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return;
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}
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}
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let shouldComplete = false;
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const args = [];
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for (let i = 0; i < len; i++) {
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let iterator = iterators[i];
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let result = iterator.next();
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if (iterator.hasCompleted()) {
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shouldComplete = true;
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}
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if (result.done) {
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destination.complete();
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return;
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}
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args.push(result.value);
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}
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if (this.resultSelector) {
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this._tryresultSelector(args);
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}
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else {
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destination.next(args);
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}
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if (shouldComplete) {
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destination.complete();
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}
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}
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_tryresultSelector(args) {
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let result;
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try {
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result = this.resultSelector.apply(this, args);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.destination.next(result);
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}
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}
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class StaticIterator {
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constructor(iterator) {
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this.iterator = iterator;
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this.nextResult = iterator.next();
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}
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hasValue() {
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return true;
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}
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next() {
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const result = this.nextResult;
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this.nextResult = this.iterator.next();
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return result;
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}
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hasCompleted() {
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const nextResult = this.nextResult;
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return nextResult && nextResult.done;
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}
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}
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class StaticArrayIterator {
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constructor(array) {
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this.array = array;
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this.index = 0;
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this.length = 0;
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this.length = array.length;
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}
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[Symbol_iterator]() {
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return this;
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}
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next(value) {
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const i = this.index++;
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const array = this.array;
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return i < this.length ? { value: array[i], done: false } : { value: null, done: true };
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}
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hasValue() {
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return this.array.length > this.index;
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}
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hasCompleted() {
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return this.array.length === this.index;
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}
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}
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class ZipBufferIterator extends OuterSubscriber {
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constructor(destination, parent, observable) {
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super(destination);
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this.parent = parent;
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this.observable = observable;
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this.stillUnsubscribed = true;
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this.buffer = [];
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this.isComplete = false;
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}
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[Symbol_iterator]() {
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return this;
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}
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next() {
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const buffer = this.buffer;
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if (buffer.length === 0 && this.isComplete) {
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return { value: null, done: true };
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}
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else {
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return { value: buffer.shift(), done: false };
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}
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}
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hasValue() {
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return this.buffer.length > 0;
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}
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hasCompleted() {
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return this.buffer.length === 0 && this.isComplete;
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}
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notifyComplete() {
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if (this.buffer.length > 0) {
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this.isComplete = true;
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this.parent.notifyInactive();
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}
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else {
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this.destination.complete();
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}
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.buffer.push(innerValue);
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this.parent.checkIterators();
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}
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subscribe(value, index) {
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return subscribeToResult(this, this.observable, this, index);
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}
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}
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//# sourceMappingURL=zip.js.map
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