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const modifiedKeyName = (name) => {
if (name === ' ') {
return 'Space';
}
if (name.length === 1) {
return name;
} else if (name === 'Escape') {
return 'Esc';
}
return name;
};
const fromKeyboardEvent = (e) => {
let key = modifiedKeyName(e.key);
let shift = e.shiftKey;
if (key.length === 1 && key.toUpperCase() === key.toLowerCase()) {
// make shift false for symbols to enable key bindings by symbold keys.
// But this limits key bindings by symbol keys with Shift (such as Shift+$>.
shift = false;
}
return {
key: modifiedKeyName(e.key),
shiftKey: shift,
ctrlKey: e.ctrlKey,
altKey: e.altKey,
metaKey: e.metaKey,
};
};
const fromMapKey = (key) => {
if (key.startsWith('<') && key.endsWith('>')) {
let inner = key.slice(1, -1);
let shift = inner.includes('S-');
let base = inner.slice(inner.lastIndexOf('-') + 1);
if (shift && base.length === 1) {
base = base.toUpperCase();
} else if (!shift && base.length === 1) {
base = base.toLowerCase();
}
return {
key: base,
shiftKey: inner.includes('S-'),
ctrlKey: inner.includes('C-'),
altKey: inner.includes('A-'),
metaKey: inner.includes('M-'),
};
}
return {
key: key,
shiftKey: key.toLowerCase() !== key,
ctrlKey: false,
altKey: false,
metaKey: false,
};
};
const fromMapKeys = (keys) => {
const fromMapKeysRecursive = (remainings, mappedKeys) => {
if (remainings.length === 0) {
return mappedKeys;
}
let nextPos = 1;
if (remainings.startsWith('<')) {
let ltPos = remainings.indexOf('>');
if (ltPos > 0) {
nextPos = ltPos + 1;
}
}
return fromMapKeysRecursive(
remainings.slice(nextPos),
mappedKeys.concat([fromMapKey(remainings.slice(0, nextPos))])
);
};
return fromMapKeysRecursive(keys, []);
};
const equals = (e1, e2) => {
return e1.key === e2.key &&
e1.ctrlKey === e2.ctrlKey &&
e1.metaKey === e2.metaKey &&
e1.altKey === e2.altKey &&
e1.shiftKey === e2.shiftKey;
};
export { fromKeyboardEvent, fromMapKey, fromMapKeys, equals };
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