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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { getHTMLElementOrNull } from "@/scripts/get-dom-node-or-null.js";
//#region types
export type Keymap = Record<string, CallbackFunction | CallbackObject>;
type CallbackFunction = (ev: KeyboardEvent) => unknown;
type CallbackObject = {
callback: CallbackFunction;
allowRepeat?: boolean;
};
type Pattern = {
which: string[];
ctrl: boolean;
alt: boolean;
shift: boolean;
};
type Action = {
patterns: Pattern[];
callback: CallbackFunction;
options: Required<Omit<CallbackObject, 'callback'>>;
};
//#endregion
//#region consts
const KEY_ALIASES = {
'esc': 'Escape',
'enter': 'Enter',
'space': ' ',
'up': 'ArrowUp',
'down': 'ArrowDown',
'left': 'ArrowLeft',
'right': 'ArrowRight',
'plus': ['+', ';'],
};
const MODIFIER_KEYS = ['ctrl', 'alt', 'shift'];
const IGNORE_ELEMENTS = ['input', 'textarea', 'ruffle-player'];
//#endregion
//#region store
let latestHotkey: Pattern & { callback: CallbackFunction } | null = null;
//#endregion
//#region impl
export const makeHotkey = (keymap: Keymap) => {
const actions = parseKeymap(keymap);
return (ev: KeyboardEvent) => {
if ('pswp' in window && window.pswp != null) return;
if (document.activeElement != null) {
if (IGNORE_ELEMENTS.includes(document.activeElement.tagName.toLowerCase())) return;
if (getHTMLElementOrNull(document.activeElement)?.isContentEditable) return;
}
for (const action of actions) {
if (matchPatterns(ev, action)) {
ev.preventDefault();
ev.stopPropagation();
action.callback(ev);
storePattern(ev, action.callback);
}
}
};
};
const parseKeymap = (keymap: Keymap) => {
return Object.entries(keymap).map(([rawPatterns, rawCallback]) => {
const patterns = parsePatterns(rawPatterns);
const callback = parseCallback(rawCallback);
const options = parseOptions(rawCallback);
return { patterns, callback, options } as const satisfies Action;
});
};
const parsePatterns = (rawPatterns: keyof Keymap) => {
return rawPatterns.split('|').map(part => {
const keys = part.split('+').map(trimLower);
const which = parseKeyCode(keys.findLast(x => !MODIFIER_KEYS.includes(x)));
const ctrl = keys.includes('ctrl');
const alt = keys.includes('alt');
const shift = keys.includes('shift');
return { which, ctrl, alt, shift } as const satisfies Pattern;
});
};
const parseCallback = (rawCallback: Keymap[keyof Keymap]) => {
if (typeof rawCallback === 'object') {
return rawCallback.callback;
}
return rawCallback;
};
const parseOptions = (rawCallback: Keymap[keyof Keymap]) => {
const defaultOptions = {
allowRepeat: false,
} as const satisfies Action['options'];
if (typeof rawCallback === 'object') {
const { callback, ...rawOptions } = rawCallback;
const options = { ...defaultOptions, ...rawOptions };
return { ...options } as const satisfies Action['options'];
}
return { ...defaultOptions } as const satisfies Action['options'];
};
const matchPatterns = (ev: KeyboardEvent, action: Action) => {
const { patterns, options, callback } = action;
if (ev.repeat && !options.allowRepeat) return false;
const key = ev.key.toLowerCase();
return patterns.some(({ which, ctrl, shift, alt }) => {
if (
options.allowRepeat === false &&
latestHotkey != null &&
latestHotkey.which.includes(key) &&
latestHotkey.ctrl === ctrl &&
latestHotkey.alt === alt &&
latestHotkey.shift === shift &&
latestHotkey.callback === callback
) {
return false;
}
if (!which.includes(key)) return false;
if (ctrl !== (ev.ctrlKey || ev.metaKey)) return false;
if (alt !== ev.altKey) return false;
if (shift !== ev.shiftKey) return false;
return true;
});
};
let lastHotKeyStoreTimer: number | null = null;
const storePattern = (ev: KeyboardEvent, callback: CallbackFunction) => {
if (lastHotKeyStoreTimer != null) {
clearTimeout(lastHotKeyStoreTimer);
}
latestHotkey = {
which: [ev.key.toLowerCase()],
ctrl: ev.ctrlKey || ev.metaKey,
alt: ev.altKey,
shift: ev.shiftKey,
callback,
};
lastHotKeyStoreTimer = window.setTimeout(() => {
latestHotkey = null;
}, 500);
};
const parseKeyCode = (input?: string | null) => {
if (input == null) return [];
const raw = getValueByKey(KEY_ALIASES, input);
if (raw == null) return [input];
if (typeof raw === 'string') return [trimLower(raw)];
return raw.map(trimLower);
};
const getValueByKey = <
T extends Record<keyof any, unknown>,
K extends keyof T | keyof any,
R extends K extends keyof T ? T[K] : T[keyof T] | undefined,
>(obj: T, key: K) => {
return obj[key] as R;
};
const trimLower = (str: string) => str.trim().toLowerCase();
//#endregion
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