work.suroh.tk/node_modules/rxjs/_esm2015/observable/IteratorObservable.js

148 lines
3.9 KiB
JavaScript

import { root } from '../util/root';
import { Observable } from '../Observable';
import { iterator as Symbol_iterator } from '../symbol/iterator';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class IteratorObservable extends Observable {
constructor(iterator, scheduler) {
super();
this.scheduler = scheduler;
if (iterator == null) {
throw new Error('iterator cannot be null.');
}
this.iterator = getIterator(iterator);
}
static create(iterator, scheduler) {
return new IteratorObservable(iterator, scheduler);
}
static dispatch(state) {
const { index, hasError, iterator, subscriber } = state;
if (hasError) {
subscriber.error(state.error);
return;
}
let result = iterator.next();
if (result.done) {
subscriber.complete();
return;
}
subscriber.next(result.value);
state.index = index + 1;
if (subscriber.closed) {
if (typeof iterator.return === 'function') {
iterator.return();
}
return;
}
this.schedule(state);
}
/** @deprecated internal use only */ _subscribe(subscriber) {
let index = 0;
const { iterator, scheduler } = this;
if (scheduler) {
return scheduler.schedule(IteratorObservable.dispatch, 0, {
index, iterator, subscriber
});
}
else {
do {
let result = iterator.next();
if (result.done) {
subscriber.complete();
break;
}
else {
subscriber.next(result.value);
}
if (subscriber.closed) {
if (typeof iterator.return === 'function') {
iterator.return();
}
break;
}
} while (true);
}
}
}
class StringIterator {
constructor(str, idx = 0, len = str.length) {
this.str = str;
this.idx = idx;
this.len = len;
}
[Symbol_iterator]() { return (this); }
next() {
return this.idx < this.len ? {
done: false,
value: this.str.charAt(this.idx++)
} : {
done: true,
value: undefined
};
}
}
class ArrayIterator {
constructor(arr, idx = 0, len = toLength(arr)) {
this.arr = arr;
this.idx = idx;
this.len = len;
}
[Symbol_iterator]() { return this; }
next() {
return this.idx < this.len ? {
done: false,
value: this.arr[this.idx++]
} : {
done: true,
value: undefined
};
}
}
function getIterator(obj) {
const i = obj[Symbol_iterator];
if (!i && typeof obj === 'string') {
return new StringIterator(obj);
}
if (!i && obj.length !== undefined) {
return new ArrayIterator(obj);
}
if (!i) {
throw new TypeError('object is not iterable');
}
return obj[Symbol_iterator]();
}
const maxSafeInteger = Math.pow(2, 53) - 1;
function toLength(o) {
let len = +o.length;
if (isNaN(len)) {
return 0;
}
if (len === 0 || !numberIsFinite(len)) {
return len;
}
len = sign(len) * Math.floor(Math.abs(len));
if (len <= 0) {
return 0;
}
if (len > maxSafeInteger) {
return maxSafeInteger;
}
return len;
}
function numberIsFinite(value) {
return typeof value === 'number' && root.isFinite(value);
}
function sign(value) {
let valueAsNumber = +value;
if (valueAsNumber === 0) {
return valueAsNumber;
}
if (isNaN(valueAsNumber)) {
return valueAsNumber;
}
return valueAsNumber < 0 ? -1 : 1;
}
//# sourceMappingURL=IteratorObservable.js.map