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/** PURE_IMPORTS_START .._Subscriber,.._util_EmptyError PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b)
if (b.hasOwnProperty(p))
d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { Subscriber } from '../Subscriber';
import { EmptyError } from '../util/EmptyError';
/**
* Emits only the first value (or the first value that meets some condition)
* emitted by the source Observable.
*
* <span class="informal">Emits only the first value. Or emits only the first
* value that passes some test.</span>
*
* <img src="./img/first.png" width="100%">
*
* If called with no arguments, `first` emits the first value of the source
* Observable, then completes. If called with a `predicate` function, `first`
* emits the first value of the source that matches the specified condition. It
* may also take a `resultSelector` function to produce the output value from
* the input value, and a `defaultValue` to emit in case the source completes
* before it is able to emit a valid value. Throws an error if `defaultValue`
* was not provided and a matching element is not found.
*
* @example <caption>Emit only the first click that happens on the DOM</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.first();
* result.subscribe(x => console.log(x));
*
* @example <caption>Emits the first click that happens on a DIV</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.first(ev => ev.target.tagName === 'DIV');
* result.subscribe(x => console.log(x));
*
* @see {@link filter}
* @see {@link find}
* @see {@link take}
*
* @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
* callback if the Observable completes before any `next` notification was sent.
*
* @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]
* An optional function called with each item to test for condition matching.
* @param {function(value: T, index: number): R} [resultSelector] A function to
* produce the value on the output Observable based on the values
* and the indices of the source Observable. The arguments passed to this
* function are:
* - `value`: the value that was emitted on the source.
* - `index`: the "index" of the value from the source.
* @param {R} [defaultValue] The default value emitted in case no valid value
* was found on the source.
* @return {Observable<T|R>} An Observable of the first item that matches the
* condition.
* @method first
* @owner Observable
*/
export function first(predicate, resultSelector, defaultValue) {
return function (source) { return source.lift(new FirstOperator(predicate, resultSelector, defaultValue, source)); };
}
var FirstOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
function FirstOperator(predicate, resultSelector, defaultValue, source) {
this.predicate = predicate;
this.resultSelector = resultSelector;
this.defaultValue = defaultValue;
this.source = source;
}
FirstOperator.prototype.call = function (observer, source) {
return source.subscribe(new FirstSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));
};
return FirstOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var FirstSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(FirstSubscriber, _super);
function FirstSubscriber(destination, predicate, resultSelector, defaultValue, source) {
_super.call(this, destination);
this.predicate = predicate;
this.resultSelector = resultSelector;
this.defaultValue = defaultValue;
this.source = source;
this.index = 0;
this.hasCompleted = false;
this._emitted = false;
}
FirstSubscriber.prototype._next = function (value) {
var index = this.index++;
if (this.predicate) {
this._tryPredicate(value, index);
}
else {
this._emit(value, index);
}
};
FirstSubscriber.prototype._tryPredicate = function (value, index) {
var result;
try {
result = this.predicate(value, index, this.source);
}
catch (err) {
this.destination.error(err);
return;
}
if (result) {
this._emit(value, index);
}
};
FirstSubscriber.prototype._emit = function (value, index) {
if (this.resultSelector) {
this._tryResultSelector(value, index);
return;
}
this._emitFinal(value);
};
FirstSubscriber.prototype._tryResultSelector = function (value, index) {
var result;
try {
result = this.resultSelector(value, index);
}
catch (err) {
this.destination.error(err);
return;
}
this._emitFinal(result);
};
FirstSubscriber.prototype._emitFinal = function (value) {
var destination = this.destination;
if (!this._emitted) {
this._emitted = true;
destination.next(value);
destination.complete();
this.hasCompleted = true;
}
};
FirstSubscriber.prototype._complete = function () {
var destination = this.destination;
if (!this.hasCompleted && typeof this.defaultValue !== 'undefined') {
destination.next(this.defaultValue);
destination.complete();
}
else if (!this.hasCompleted) {
destination.error(new EmptyError);
}
};
return FirstSubscriber;
}(Subscriber));
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