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import { IObservable, IDestroyable, ICancellation } from "../../interfaces";
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import { TraceEvent, LogLevel, WarnLevel, DebugLevel } from "../TraceSource";
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import { Cancellation } from "../../Cancellation";
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import { destroy } from "../../safe";
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function hasConsole() {
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try {
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// tslint:disable-next-line:no-console
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return (typeof console !== "undefined" && typeof console.log === "function");
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} catch {
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return false;
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}
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}
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export class ConsoleWriter implements IDestroyable {
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readonly _subscriptions = new Array<IDestroyable>();
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writeEvents(source: IObservable<TraceEvent>, ct: ICancellation = Cancellation.none) {
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const subscription = source.on(this.writeEvent.bind(this));
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if (ct.isSupported()) {
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ct.register(subscription.destroy.bind(subscription));
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}
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this._subscriptions.push(subscription);
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}
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writeEvent(next: TraceEvent) {
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// IE will create console only when devepoler tools are activated
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if (!hasConsole())
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return;
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if (next.level >= DebugLevel) {
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// tslint:disable-next-line:no-console
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console.debug(next.source.id.toString(), next.arg);
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} else if (next.level >= LogLevel) {
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// tslint:disable-next-line:no-console
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console.log(next.source.id.toString(), next.arg);
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} else if (next.level >= WarnLevel) {
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// tslint:disable-next-line:no-console
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console.warn(next.source.id.toString(), next.arg);
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} else {
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// tslint:disable-next-line:no-console
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console.error(next.source.id.toString(), next.arg);
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}
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}
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destroy() {
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this._subscriptions.forEach(destroy);
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}
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}
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