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| import {root} from '../util/root';
import {isObject} from '../util/isObject';
import {tryCatch} from '../util/tryCatch';
import {Scheduler} from '../Scheduler';
import {Observable} from '../Observable';
import {isFunction} from '../util/isFunction';
import {SymbolShim} from '../util/SymbolShim';
import {errorObject} from '../util/errorObject';
import {Subscription} from '../Subscription';
import {Subscriber} from '../Subscriber';
export class IteratorObservable<T> extends Observable<T> {
private iterator: any;
static create<T>(iterator: any,
project?: ((x?: any, i?: number) => T) | any,
thisArg?: any | Scheduler,
scheduler?: Scheduler) {
return new IteratorObservable(iterator, project, thisArg, scheduler);
}
static dispatch(state: any) {
const { index, hasError, thisArg, project, iterator, subscriber } = state;
if (hasError) {
subscriber.error(state.error);
return;
}
let result = iterator.next();
if (result.done) {
subscriber.complete();
return;
}
Eif (project) {
result = tryCatch(project).call(thisArg, result.value, index);
if (result === errorObject) {
state.error = errorObject.e;
state.hasError = true;
} else {
subscriber.next(result);
state.index = index + 1;
}
} else {
subscriber.next(result.value);
state.index = index + 1;
}
if (subscriber.isUnsubscribed) {
return;
}
(<any> this).schedule(state);
}
private thisArg: any;
private project: (x?: any, i?: number) => T;
private scheduler: Scheduler;
constructor(iterator: any,
project?: ((x?: any, i?: number) => T) | any,
thisArg?: any | Scheduler,
scheduler?: Scheduler) {
super();
if (iterator == null) {
throw new Error('iterator cannot be null.');
}
Iif (isObject(project)) {
this.thisArg = project;
this.scheduler = thisArg;
} else if (isFunction(project)) {
this.project = project;
this.thisArg = thisArg;
this.scheduler = scheduler;
} else if (project != null) {
throw new Error('When provided, `project` must be a function.');
}
this.iterator = getIterator(iterator);
}
protected _subscribe(subscriber: Subscriber<T>): Subscription | Function | void {
let index = 0;
const { iterator, project, thisArg, scheduler } = this;
if (scheduler) {
return scheduler.schedule(IteratorObservable.dispatch, 0, {
index, thisArg, project, iterator, subscriber
});
} else {
do {
let result = iterator.next();
if (result.done) {
subscriber.complete();
break;
} else if (project) {
result = tryCatch(project).call(thisArg, result.value, index++);
if (result === errorObject) {
subscriber.error(errorObject.e);
break;
}
subscriber.next(result);
} else {
subscriber.next(result.value);
}
if (subscriber.isUnsubscribed) {
break;
}
} while (true);
}
}
}
class StringIterator {
constructor(private str: string,
private idx: number = 0,
private len: number = str.length) {
}
[SymbolShim.iterator]() { return (this); }
next() {
return this.idx < this.len ? {
done: false,
value: this.str.charAt(this.idx++)
} : {
done: true,
value: undefined
};
}
}
class ArrayIterator {
constructor(private arr: Array<any>,
private idx: number = 0,
private len: number = toLength(arr)) {
}
[SymbolShim.iterator]() { return this; }
next() {
return this.idx < this.len ? {
done: false,
value: this.arr[this.idx++]
} : {
done: true,
value: undefined
};
}
}
function getIterator(obj: any) {
const i = obj[SymbolShim.iterator];
Iif (!i && typeof obj === 'string') {
return new StringIterator(obj);
}
Iif (!i && obj.length !== undefined) {
return new ArrayIterator(obj);
}
if (!i) {
throw new TypeError('Object is not iterable');
}
return obj[SymbolShim.iterator]();
}
const maxSafeInteger = Math.pow(2, 53) - 1;
function toLength(o: any) {
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: any) {
return typeof value === 'number' && root.isFinite(value);
}
function sign(value: any) {
let valueAsNumber = +value;
if (valueAsNumber === 0) {
return valueAsNumber;
}
if (isNaN(valueAsNumber)) {
return valueAsNumber;
}
return valueAsNumber < 0 ? -1 : 1;
}
|