structype_derive

This is a derive procedural macro that will let you add custom derive and attributes over structs, enums and unions. This derive will add two impl on the type. The as_string() method returns a json serialized string representation of the type with any meta information annotated with structype_meta("key"=val) attribute while the print_fields() method will print the same to STDOUT. This macro will panic at compile time if annotated over tuple and unit structs.

The types used in this derive is from structype crate, and can be used to deserialize the string generated by this macro.

Example

use structype_derive::StrucType;
#[derive(StrucType)]
// #[structype_meta("labelover_ride=name")] This will panic the macro
struct UserStruct {
    #[structype_meta(override_name="Primary ID", order="1")]
    id: i64,
    #[structype_meta(override_name="name", order="0")]
    username: String,
    org: String,
    details: Details,
}

#[derive(StrucType)]
struct Details {
    user_attributes: std::collections::HashMap<String, String>,
}

fn print_struct_fields() {
    UserStruct::print_fields();
    let data = UserStruct::as_string();
    println!("{}", data);
    Details::print_fields();
    let data = Details::as_string();
    println!("{}", data);
}

The above will generate and return a json serialized string representation where the key is the struct's field name and the value is a HashMap<String, String> of structype_meta's key-val. If the structype_meta is absent, the field's associated value would be an empty {}.

Output

  [
      {
          "field_name": "id",
          "meta": {
              "order": "1",
              "override_name": "Primary ID"
          }
      },
      {
          "field_name": "username",
          "meta": {
              "override_name": "name",
              "order": "0"
          }
      },
      {
          "field_name": "org",
          "meta": {}
      },
      {
          "field_name": "details",
          "meta": {}
      }
  ]