Function getParentPath

ui/src/protocol/path-resolver.ts:523–534

(path: string)

 * @returns 父路径，如果是根路径则返回 null
 */
export function getParentPath(path: string): string | null {
  if (!isValidJsonPointer(path) || path === '') {
    return null;
  }

  const tokens = parseJsonPointer(path);
  if (tokens.length === 0) {
    return null;
  }

  return toJsonPointer(tokens.slice(0, -1));
}

/**
 * 获取路径的最后一个段