BracketQueryEncoder.ts

class BracketQueryEncoder {
  private result: [string, string][] = [];

  encode(json: any): [string, string][] {
    this.result = [];
    this.encodeStep([], json);
    return this.result;
  }

  encodeStep(path: string[], json: any) {
    if (typeof json == "object") {
      for (const key of Object.keys(json)) {
        this.encodeStep(path.concat(key), json[key]);
      }
    } else if (typeof json == "string") {
      this.result.push([this.pathString(path), json]);
    } else {
      // ...
    }
  }

  pathString(path: string[]): string {
    var str = "";
    path.forEach((elem, i) => {
      if (i == 0) {
        str = elem;
      } else {
        str += "[" + elem + "]";
      }
    });
    return str;
  }
}