Rust로 web assembly 만들어보기 (3) - Rust로 다양한 Web Assembly 만들어보기

[package]
name = "consolelog"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
wasm-bindgen = "0.2.74"
web-sys = { version = "0.3.56", features = ['console'] }

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
extern {
    // js_namespace는 console을 할당했다.
    // 즉 log만 쓰면 console.log가 된다.
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: &str);

    // 여기는 console.log
    #[wasm_bindgen(js_namespace=console, js_name=log)]
    fn log_u32(a: u32);

    // 여기도 console.log
    #[wasm_bindgen(js_namespace=console, js_name=log)]
    fn log_strings(a: &str, b: &str);
}

macro_rules! console_log {
    // log 함수랑 연결된다.
    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
}

// rust extern으로 하는 방법
fn rust() {
    log("Hello yceffort!");
    log_u32(42);
    log_strings("Hello", "yceffort")
}

// macro
fn using_macro() {
    console_log!("Hello {}!", "yceffort");
    console_log!("Hello yceffort");
}

// websys library
fn using_web_sys() {
    use web_sys::console;

    console::log_1(&"Hello using web-sys".into());

    let js: JsValue = 4.into();

    console::log_2(&"Logging values are".into(), &js);
}

#[wasm_bindgen(start)]
pub fn run() {
    rust();
    using_macro();
    using_web_sys();
}

[package]
name = "without-bundler"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib"]

[dependencies]
wasm-bindgen = "0.2.79"

[dependencies.web-sys]
version = "0.3.4"
features = [
  'Document',
  'Element',
  'HtmlElement',
  'Node',
  'Window',
]

use wasm_bindgen::prelude::*;

#[wasm_bindgen(start)]
pub fn main() {
    let window = web_sys::window().expect("there is no window in global");
    let document = window.document().expect("there is no document in window");
    let body = document.body().expect("there is no body in a document");

    let p_element = document.create_element("p").expect("fail to create P element");

    p_element.set_inner_html("Hello from rust");

    body.append_child(&p_element).expect("fail to append element");
}

#[wasm_bindgen]
pub fn add(a: u32, b: u32) -> u32 {
    a + b
}

export function name() {
  return 'Rust'
}

export class MyClass {
  constructor() {
    this._number = 42
  }

  get number() {
    return this._number
  }

  set number(n) {
    return (this._number = n)
  }

  toString() {
    return `My number is: ${this.number}`
  }
}

use wasm_bindgen::prelude::*;

#[wasm_bindgen(module = "/defined-in-js.js")]
extern "C" {
    // name 함수 정의
    fn name() -> String;

    // 클래스 정의
    type MyClass;

    // 클래스에 new keyword를 constructor로 정의
    #[wasm_bindgen(constructor)]
    fn new() -> MyClass;

    // getter
    #[wasm_bindgen(method, getter)]
    fn number(this: &MyClass) -> u32;

    // setter
    #[wasm_bindgen(method, setter)]
    fn set_number(this: &MyClass, number: u32) -> MyClass;

    // toString
    #[wasm_bindgen(method)]
    fn toString(this: &MyClass) -> String;
}

// console.log를 정의한다.
#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = console)]
    fn log(s: &str);
}

#[wasm_bindgen(start)]
pub fn run() {
    log(&format!("Hello from {}!", name())); // should output "Hello from Rust!"

    // 클래스를 선언한다
    let x = MyClass::new();
    // 테스트 코드!
    assert_eq!(x.number(), 42);
    // setter에 숫자 주입
    x.set_number(10);
    // toString
    log(&x.toString());
}

Hello from Rust!
My number is: 10