Function charToKeyCode

packages/core/src/keybindings/keyCodes.ts:125–152

(char: string)

 * @returns Key code, or null if not a valid single-char key
 */
export function charToKeyCode(char: string): number | null {
  if (char.length !== 1) return null;

  const code = char.charCodeAt(0);

  // Lowercase letters -> uppercase
  if (code >= 97 && code <= 122) {
    return code - 32; // 'a' (97) -> 'A' (65)
  }

  // Uppercase letters
  if (code >= 65 && code <= 90) {
    return code;
  }

  // Digits
  if (code >= 48 && code <= 57) {
    return code;
  }

  // Common punctuation/symbols (use ASCII directly)
  // This includes: !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
  if (code >= 32 && code <= 126) {
    return code;
  }

  return null;
}

/** Empty modifiers object (all false). */
const MODS_BY_MASK: readonly Modifiers[] = (() => {