lombok_next

lombok_next is a Rust library that mimics the functionality of Java's Lombok. It aims to provide various Lombok features through Rust proc-macros. Here are some of the features implemented in lombok_next:

Usage

Below is description of features that lombok_next currently supports.

Getter Derive Macro

use lombok_next::Getter;

#[derive(Getter)]
struct User {
    username: String,
    email: String,
    password: String,
    #[skip_getter]
    age: u8,
}

Getter derive macro is used to generate getter methods for the fields of a struct.

so the code above will be expanded to:

struct User {
    username: String,
    email: String,
    password: String,
    age: u8,
}

// automatically generated by `#[derive(Getter)]`
impl User {
    pub fn username(&self) -> &String {
        &self.username
    }

    pub fn email(&self) -> &String {
        &self.email
    }  

    pub fn password(&self) -> &String {
        &self.password
    }

    pub fn age(&self) -> &u8 {
        &self.age
    }
}

#[skip_getter] is used to skip the generation of a getter method for a specific field.

#[derive(Getter)]
struct User {
    username: String,
    email: String,
    password: String,
    #[skip_getter]
    age: u8,
}

This time, the age field will be skipped from getter method generation.

so the code above will be expanded to:

struct User {
    username: String,
    email: String,
    password: String,
    age: u8,
}

// automatically generated by `#[derive(Getter)]`
impl User {
    pub fn username(&self) -> &String {
        &self.username
    }

    pub fn email(&self) -> &String {
        &self.email
    }  

    pub fn password(&self) -> &String {
        &self.password
    }
}

like the above, getter method for age field is not generated.

Setter Derive Macro

use lombok_next::Setter;

#[derive(Setter)]
struct User {
    username: String,
    email: String,
    password: String,
    age: u8,
}

Setter derive macro is used to generate setter methods for the fields of a struct.

The setter methods are named with a set_ prefix followed by the field name.

so the code above will be expanded to:

struct User {
    username: String,
    email: String,
    password: String,
    age: u8,
}

// automatically generated by `#[derive(Setter)]`
impl User {
    pub fn set_username(&mut self, username: String) {
        self.username = username;
    }

    pub fn set_email(&mut self, email: String) {
        self.email = email;
    }

    pub fn set_password(&mut self, password: String) {
        self.password = password;
    }
}

#[skip_setter] is used to skip the generation of a setter method for a specific field.

It's the same as #[skip_getter].

#[derive(Setter)]
struct User {
    username: String,
    email: String,
    password: String,
    #[skip_setter]
    age: u8,
}

// automatically generated by `#[derive(Setter)]`
struct User {
    username: String,
    email: String,
    password: String,
    age: u8,
}

impl User {
    pub fn set_username(&mut self, username: String) {
        self.username = username;
    }

    pub fn set_email(&mut self, email: String) {
        self.email = email;
    }

    pub fn set_password(&mut self, password: String) {
        self.password = password;
    }
}

like the above, setter method for age field is not generated.

Rombok is just a hobby project.

It's never gonna be as good as Java's Lombok and no one wants to use it.

So don't use it in production.