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import { NEVER, Observable, catchError, defer, fromEvent, map, merge, race, switchMap, tap, throwError } from 'rxjs';
import { Component, component } from '../component/component';
import { customElements } from '../component/registry';
import { Router } from '../router/router';
import { Queue } from './queue';
/**
* The **Catch** type alias is used and intended to be used in conjunction with
* the {@link CatchQueue} and represents a function that is called with the
* thrown `error`. The return value of this callback will be used to examine
* whether the {@link Component} containing the decorated property is
* responsible to handle the thrown `error`.
*
* @see {@link CatchQueue}
*/
export type Catch = ((
/**
* The thrown **error**.
*/
error: unknown
) => boolean) | undefined;
/**
* {@link Component} prototype property decorator factory. Applying the
* **Catch** decorator to a property, while optionally supplying a **trap** will
* navigate to the {@link Component} containing the decorated property when an
* error, **trap**ed by this **Catch** decorator, occurs during navigation.
*
* @param trap - The {@link Catch} callback deciding whether to `trap` an error.
* @returns A {@link Component} prototype property decorator.
*
* @example
* **Catch** all {@link URIError}s:
* ```tsx
* import { Component, Catch } from '@sgrud/shell';
*
* declare global {
* interface HTMLElementTagNameMap {
* 'example-component': ExampleComponent;
* }
* }
*
* @Component('example-component')
* export class ExampleComponent extends HTMLElement implements Component {
*
* @Catch((error) => error instanceof URIError)
* public readonly error?: URIError;
*
* public get template(): JSX.Element {
* return <span>Error message: {this.error?.message}</span>;
* }
*
* }
* ```
*
* @see {@link CatchQueue}
*/
export function Catch(trap?: Catch) {
/**
* @param prototype - The {@link Component} `prototype` to be decorated.
* @param propertyKey - The {@link Component} property to be decorated.
*/
return function(prototype: Component, propertyKey: PropertyKey): void {
const linker = new Linker();
const queued = new CatchQueue();
let traps = queued.traps.get(prototype.constructor);
if (!linker.has(CatchQueue)) {
linker.set(CatchQueue, queued);
}
if (!traps) {
traps = new Map<PropertyKey, Catch>();
queued.traps.set(prototype.constructor, traps);
}
traps.set(propertyKey, trap);
Object.defineProperty(prototype, propertyKey, {
enumerable: true,
get(this: Component) {
return queued.trapped.get(prototype.constructor)?.[propertyKey];
},
set(this: Component, value: unknown): void {
if (this.isConnected) {
let trapped = queued.trapped.get(prototype.constructor);
if (!trapped) {
queued.trapped.set(prototype.constructor, trapped = {});
}
trapped[propertyKey] = value;
}
}
});
};
}
/**
* This built-in **CatchQueue** extension of the {@link Queue} base class is
* used by the {@link Catch} decorator to intercept {@link Router} navigation
* events and handles all errors thrown during the asynchronous evaluation of
* {@link Router.navigate} invocations. When the {@link Catch} decorator is
* applied at least once this **CatchQueue** will be automatically provided as
* {@link Queue} to the {@link Linker}-
*
* @decorator {@link Singleton}
*
* @see {@link Queue}
*/
@Singleton()
export class CatchQueue
extends Provider<typeof Queue>('sgrud.shell.Queue') {
/**
* {@link Map}ping of all decorated {@link Component}s to a {@link Map} of
* property keys and **trapped** errors.
*/
public readonly trapped: Map<Function, Record<PropertyKey, unknown>>;
/**
* {@link Map}ping of all decorated {@link Component}s to a {@link Map} of
* property keys and their **traps**.
*/
public readonly traps: Map<Function, Map<PropertyKey, Catch>>;
/**
* {@link Factor}ed-in **router** property linking the {@link Router}.
*
* @decorator {@link Factor}
*/
@Factor(() => Router)
private readonly router!: Router;
/**
* Public {@link Singleton} **constructor**. Called by the {@link Catch}
* decorator to link this {@link Queue} into the {@link Router} and to access
* the {@link trapped} and {@link traps} properties.
*/
public constructor() {
super();
this.trapped = new Map<Function, Record<PropertyKey, unknown>>();
this.traps = new Map<Function, Map<PropertyKey, Catch>>();
}
/**
* Overridden **handle** method of the {@link Queue} base class. Iterates all
* {@link Router.Segment}s of the `next` {@link Router.State} and collects all
* {@link traps} for any encountered {@link Component}s in those iterated
* {@link Router.Segment}s.
*
* @param _prev - The `_prev`iously active {@link Router.State} (ignored).
* @param next - The `next` {@link Router.State} {@link Router.navigate}d to.
* @param queue - The next {@link Queue} to **handle** the navigation.
* @returns An {@link Observable} of the **handle**d {@link Router.State}.
*/
public override handle(
_prev: Router.State,
next: Router.State,
queue: Router.Queue
): Observable<Router.State> {
return race(
this.handleErrors(),
queue.handle(next)
).pipe(catchError((error) => {
let segment = this.router.spool(next.segment, false);
let trapped;
loop: do {
delete (segment as Mutable<Router.Segment>).child;
const elements = [];
if (segment.route.component) {
elements.push(segment.route.component);
}
if (segment.route.slots) {
for (const key in segment.route.slots) {
elements.push(segment.route.slots[key]);
}
}
for (const element of elements) {
let constructor = customElements.get(element) as (
CustomElementConstructor & { [component]?: new () => Component }
) | undefined;
if (constructor) {
constructor = constructor[component] || constructor;
const route = this.router.join(segment);
const traps = this.traps.get(constructor);
if (TypeOf.string(route) && traps?.size) {
for (const [key, trap] of traps) {
const handle = trap?.(error);
if (handle || !trap) {
trapped = defer(() => {
this.trapped.clear();
this.trapped.set(constructor!, { [key]: error });
return this.router.navigate(route, '', 'replace');
});
if (handle) {
break loop;
}
}
}
}
}
}
} while (segment = segment.parent!);
if (!trapped) {
loop: for (const [constructor, traps] of this.traps) {
const element = constructor.prototype[component] || constructor;
const selector = customElements.getName(element);
const route = selector && this.router.lookup(selector);
if (TypeOf.string(route) && traps.size) {
for (const [key, trap] of traps) {
const handle = trap?.(error);
if (handle || !trap) {
trapped = defer(() => {
this.trapped.clear();
this.trapped.set(constructor, { [key]: error });
return this.router.navigate(route, '', 'replace');
});
if (handle) {
break loop;
}
}
}
}
}
}
return trapped || throwError(() => error);
}));
}
/**
* **handleErrors** helper method returning an {@link Observable} from the
* global `window.onerror` and `window.unhandledrejection` event emitters. The
* returned {@link Observable} will either {@link NEVER} complete or invoke
* {@link throwError} with any globally emitted {@link ErrorEvent} or the
* reason for a {@link PromiseRejectionEvent} while subscribed to.
*
* @returns An {@link Observable} that {@link NEVER} completes.
* @throws An {@link Observable} of any globally emitted error or rejection.
*/
private handleErrors(): Observable<never> {
if (TypeOf.window(globalThis.window)) {
return merge(
fromEvent<ErrorEvent>(window, 'error').pipe(
tap((event) => event.preventDefault()),
map((event) => event.error)
),
fromEvent<PromiseRejectionEvent>(window, 'unhandledrejection').pipe(
tap((event) => event.preventDefault()),
map((event) => event.reason)
)
).pipe(
switchMap((error) => throwError(() => error))
);
}
return NEVER;
}
}
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