public-fuse/src/helper/cascader.ts

import { Ref, computed } from "vue";
export type CascaderOptions = {
  label: string;
  value: string;
  children?: CascaderOptions;
}[];
export const splitChar = ">";

export const getValue = (val: string) => val.split(splitChar);
export const getRaw = (val: string[]) => val.join(splitChar);

export const genCascaderValue = <
  K extends string,
  T extends Ref<{ [key in K]: string }>
>(
  target: T,
  key: K,
  def?: string
) =>
  computed({
    get: () =>
      target.value[key]
        ? target.value[key].split(">")
        : def
        ? [def]
        : undefined,
    set: (val) => (target.value[key] = val!.join(">")),
  });

export const getCode = (options: CascaderOptions, raw: string) => {
  const paths = getValue(raw);
  let current = options;
  let rets = "";

  for (let val of paths) {
    const idx = current.findIndex(({ value }) => value === val);

    if (~idx) {
      rets += idx + 1;
      if (current[idx].children) {
        current = current[idx].children!;
      } else {
        break;
      }
    } else {
      // rets += "0";
      break;
    }
  }
  return rets;
};