Vim-Vixen/src/shared/settings/Key.ts

export default class Key {
  public readonly key: string;

  public readonly shift: boolean;

  public readonly ctrl: boolean;

  public readonly alt: boolean;

  public readonly meta: boolean;

  constructor({ key, shift, ctrl, alt, meta }: {
    key: string;
    shift: boolean;
    ctrl: boolean;
    alt: boolean;
    meta: boolean;
  }) {
    this.key = key;
    this.shift = shift;
    this.ctrl = ctrl;
    this.alt = alt;
    this.meta = meta;
  }

  static fromMapKey(str: string): Key {
    if (str.startsWith('<') && str.endsWith('>')) {
      let inner = str.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 new Key({
        key: base,
        shift: shift,
        ctrl: inner.includes('C-'),
        alt: inner.includes('A-'),
        meta: inner.includes('M-'),
      });
    }

    return new Key({
      key: str,
      shift: str.toLowerCase() !== str,
      ctrl: false,
      alt: false,
      meta: false,
    });
  }

  equals(key: Key) {
    return this.key === key.key &&
      this.ctrl === key.ctrl &&
      this.meta === key.meta &&
      this.alt === key.alt &&
      this.shift === key.shift;
  }
}