Attr-rs

A Rust library focused on implementing one of the BEST features in Ruby attr_reader, attr_writer, and attr_accessor using procedural macros in Rust. The main goal being to reduce the common getter and setter methods with a single macro to reduce time spent on boilerplate and allow for more time to spend tackling more interesting problems!

attr_reader - Generate ONLY getter methods for provided fields

attr_writer - Generate ONLY setter methods for provided fields

attr_accessor - Generate BOTH getter and setter methods for provided fields

These 3 macros are Attribute macros and follow the general format of attr_reader(field1, field2, field3, ...) and must be placed before/on top of a struct

The Comma separated list is unnecessary, spaces are fine as well as any form of punctuation that the Rust compiler allows for

Why

Recently, I've dabbled with Ruby, at Ohio State University in CSE3901, and really loved the attr macros that it had built-in the language to prevent the definition of basic getter and setter methods for any class. It's the small things like this that make a language GREAT and I really miss this feature when writing code in other languages. So why not attempt to bring this feature to Rust struct!

I'm lazy, I'll admit it 😅

I don't want to write these super simplistic methods for classes, I'd rather focus on the interesting problem that I seek to tackle with the class rather than the boring, mundane code that is required for the class to function and that's the goal of this crate to increase productivity and decrease bloated source code with the basic methods that are necessary 👍

Example

Without Attr

struct Person {
    name: String,
    age: u64,
}

impl Person {
    pub fn new(name: String, age: u64) -> Self {
    	Self { name, age }
    }

    pub fn get_name(&self) -> &str {
    	self.name
    }

    pub fn get_age(&self) -> u64 {
    	self.age
    }

    pub fn set_name(&mut self, name: String) {
    	self.name = name;
    }

    pub fn set_age(&mut self, age: u64) {
    	self.age = age;
    }
}

With Attr

#[macro_use]
extern crate attr_rs;

#[attr_accessor(name, age)]
struct Person {
    name: String,
    age: u64,
}

impl Person {
    pub fn new(name: String, age: u64) -> Self {
    	Self { name, age }
    }
}

Add to your Cargo.toml

[dependencies]
attr_rs = "0.1.0"

Errors

❌ Duplicate attributes

In Ruby the attr macros are provided Symbols which are required to be unique and therefore this crate seeks to emulate that behavior, mostly because it just makes sense, and therefore will error on duplicate fields

❌ Unknown attribute

Creating getters and setters for an nonexistent field in a struct makes no sense

❌ Provided attribute isn't an Identifier

Providing a Literal like 6 to create a getters and setters for makes no sense and neither does providing a Group like (Hello)

All Errors are compile time errors

Contributions

All are welcome and appreciated 😄

Please open an issue for any feature requests, and open a pull request for any bug fixes

License

MIT

Thanks to Icons8 for the Ruby and Heart Icon ❤️