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mod.ts
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mod.ts
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import { KeyCode, parse } from "../keycode/mod.ts";
type KeyPressEventType = "keydown";
interface KeyCodeOptions {
name?: string;
char?: string;
sequence?: string;
code?: string;
ctrl?: boolean;
meta?: boolean;
shift?: boolean;
alt?: boolean;
repeat?: boolean;
}
export type KeyPressEventListener = (
evt: KeyPressEvent,
) => void | Promise<void>;
export interface KeyPressEventListenerObject {
handleEvent(evt: KeyPressEvent): void | Promise<void>;
}
export type KeyPressEventInit = EventInit & KeyCodeOptions;
export type KeyPressEventListenerOrEventListenerObject =
| KeyPressEventListener
| KeyPressEventListenerObject;
export class KeyPressEvent extends Event {
public readonly key?: string;
public readonly char?: string;
public readonly sequence?: string;
public readonly code?: string;
public readonly ctrlKey: boolean;
public readonly metaKey: boolean;
public readonly shiftKey: boolean;
public readonly altKey: boolean;
public readonly repeat: boolean;
constructor(
type: KeyPressEventType,
eventInitDict: KeyPressEventInit,
) {
super(type, eventInitDict);
this.key = eventInitDict.name;
this.char = eventInitDict.char;
this.sequence = eventInitDict.sequence;
this.code = eventInitDict.code;
this.ctrlKey = eventInitDict.ctrl ?? false;
this.metaKey = eventInitDict.meta ?? false;
this.shiftKey = eventInitDict.shift ?? false;
this.altKey = eventInitDict.alt ?? false;
this.repeat = eventInitDict.repeat ?? false;
}
}
type Resolver<T> = (value: T | PromiseLike<T>) => void;
type Reject = (error: Error) => void;
interface PullQueueItem {
resolve: Resolver<KeyPressEvent | null>;
reject: Reject;
}
export class Keypress extends EventTarget
implements AsyncIterableIterator<KeyPressEvent>, PromiseLike<KeyPressEvent> {
#disposed = false;
#pullQueue: PullQueueItem[] = [];
#pushQueue: (KeyPressEvent | null)[] = [];
#lastEvent?: KeyPressEvent;
#listeners: Record<
KeyPressEventType,
Set<EventListenerOrEventListenerObject | null>
> = {
keydown: new Set(),
};
[Symbol.asyncIterator](): AsyncIterableIterator<KeyPressEvent> {
return this;
}
get disposed(): boolean {
return this.#disposed;
}
async next(): Promise<IteratorResult<KeyPressEvent>> {
const event: KeyPressEvent | null | false = !this.#disposed &&
await this.#pullEvent();
return event && !this.#disposed
? { done: false, value: event }
: { done: true, value: undefined };
}
then<T, S>(
f: (v: KeyPressEvent) => T | Promise<T>,
g?: (v: Error) => S | Promise<S>,
): Promise<T | S> {
return this.next()
.then(({ value }) => {
this.dispose();
return value;
})
.then(f)
.catch(g);
}
addEventListener(
type: "keydown",
listener: KeyPressEventListenerOrEventListenerObject | null,
options?: boolean | AddEventListenerOptions,
): void;
addEventListener(
type: KeyPressEventType,
listener: EventListenerOrEventListenerObject | null,
options?: boolean | AddEventListenerOptions,
): void {
if (!this.#hasListeners()) {
void this.#eventLoop();
}
super.addEventListener(type, listener, options);
this.#listeners[type].add(listener);
}
removeEventListener(
type: "keydown",
callback: KeyPressEventListenerOrEventListenerObject | null,
options?: EventListenerOptions | boolean,
): void;
removeEventListener(
type: KeyPressEventType,
listener: EventListenerOrEventListenerObject | null,
options?: EventListenerOptions | boolean,
): void {
super.removeEventListener(type, listener, options);
this.#listeners[type].delete(listener);
}
dispose(error?: Error) {
if (this.#disposed) {
throw new Error("KeyCodeStream already disposed");
}
this.#disposed = true;
if (this.#pullQueue.length > 0) {
const { resolve, reject } = this.#pullQueue[0];
this.#pullQueue.shift();
error ? reject(error) : resolve(null);
}
}
#eventLoop = async (): Promise<void> => {
if (this.#disposed) {
return;
}
await this.#read();
// Jump into the next cycle of deno's event loop.
await new Promise((resolve) => setTimeout(resolve));
// Stop event loop if there are no listeners available.
if (this.#pullQueue.length || this.#hasListeners()) {
await this.#eventLoop();
}
};
#read = async (): Promise<void> => {
const buffer = new Uint8Array(8);
// Deno.stdin.setRaw(true, { cbreak: true });
Deno.stdin.setRaw(true);
const nread: number | null = await Deno.stdin.read(buffer).catch(
(error) => {
if (!this.#disposed) {
this.dispose(error);
}
return null;
},
);
Deno.stdin.setRaw(false);
if (this.#disposed) {
return;
}
let keys: Array<KeyCode>;
try {
keys = nread === null ? parse(buffer) : parse(buffer.subarray(0, nread));
} catch (_) {
// Ignore invalid characters and read again from stdin.
return this.#read();
}
this.#dispatch(keys);
};
#dispatch = (keys: Array<KeyCode>): void => {
for (const key of keys) {
const event = new KeyPressEvent("keydown", {
...key,
cancelable: true,
repeat: this.#lastEvent && this.#lastEvent.sequence === key.sequence &&
Date.now() - this.#lastEvent.timeStamp < 100,
});
if (this.#pullQueue.length || !this.#hasListeners()) {
this.#pushEvent(event);
}
if (this.#hasListeners()) {
// const canceled = !this.dispatchEvent(event);
// if (canceled || this.#disposed) {
// if (this.#disposed) {
// if (!this.#disposed) {
// this.dispose();
// }
// break;
// }
this.dispatchEvent(event);
if (this.#disposed) {
break;
}
}
this.#lastEvent = event;
}
};
#pushEvent = (event: KeyPressEvent): void => {
if (this.#pullQueue.length > 0) {
const { resolve } = this.#pullQueue.shift() as PullQueueItem;
resolve(event);
} else {
this.#pushQueue.push(event);
}
};
#pullEvent = async (): Promise<KeyPressEvent | null> => {
if (!this.#hasListeners()) {
await this.#read();
}
return new Promise<KeyPressEvent | null>(
(resolve: Resolver<KeyPressEvent | null>, reject: Reject) => {
if (this.#pushQueue.length > 0) {
const event: KeyPressEvent | null = this.#pushQueue.shift() ?? null;
resolve(event);
} else {
this.#pullQueue.push({ resolve, reject });
}
},
);
};
#hasListeners = (): boolean => {
return Object.values(this.#listeners).some((listeners) => listeners.size);
};
}
let keyPress: Keypress;
export function keypress(): Keypress {
if (!keyPress || keyPress.disposed) {
keyPress = new Keypress();
}
return keyPress;
}