Sharkey/packages/client/src/scripts/hotkey.ts

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import keyCode from './keycode';
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type Callback = (ev: KeyboardEvent) => void;
type Keymap = Record<string, Callback>;
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type Pattern = {
which: string[];
ctrl?: boolean;
shift?: boolean;
alt?: boolean;
};
type Action = {
patterns: Pattern[];
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callback: Callback;
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allowRepeat: boolean;
};
const parseKeymap = (keymap: Keymap) => Object.entries(keymap).map(([patterns, callback]): Action => {
const result = {
patterns: [],
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callback,
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allowRepeat: true
} as Action;
if (patterns.match(/^\(.*\)$/) !== null) {
result.allowRepeat = false;
patterns = patterns.slice(1, -1);
}
result.patterns = patterns.split('|').map(part => {
const pattern = {
which: [],
ctrl: false,
alt: false,
shift: false
} as Pattern;
const keys = part.trim().split('+').map(x => x.trim().toLowerCase());
for (const key of keys) {
switch (key) {
case 'ctrl': pattern.ctrl = true; break;
case 'alt': pattern.alt = true; break;
case 'shift': pattern.shift = true; break;
default: pattern.which = keyCode(key).map(k => k.toLowerCase());
}
}
return pattern;
});
return result;
});
const ignoreElemens = ['input', 'textarea'];
function match(ev: KeyboardEvent, patterns: Action['patterns']): boolean {
const key = ev.code.toLowerCase();
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return patterns.some(pattern => pattern.which.includes(key) &&
pattern.ctrl === ev.ctrlKey &&
pattern.shift === ev.shiftKey &&
pattern.alt === ev.altKey &&
!ev.metaKey
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);
}
export const makeHotkey = (keymap: Keymap) => {
const actions = parseKeymap(keymap);
return (ev: KeyboardEvent) => {
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if (document.activeElement) {
if (ignoreElemens.some(el => document.activeElement!.matches(el))) return;
if (document.activeElement.attributes['contenteditable']) return;
}
for (const action of actions) {
const matched = match(ev, action.patterns);
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if (matched) {
if (!action.allowRepeat && ev.repeat) return;
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ev.preventDefault();
ev.stopPropagation();
action.callback(ev);
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break;
}
}
};
};