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use wasm_bindgen::prelude::{wasm_bindgen, Closure};
use wasm_bindgen::JsCast;
mod utils;
use web_sys::Element;
// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
// allocator.
#[cfg(feature = "wee_alloc")]
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
#[wasm_bindgen]
pub fn init() {
utils::set_panic_hook();
// window and document have to be fetched from JS world
let window = web_sys::window().unwrap();
let document = window.document().unwrap();
let main = document.get_elements_by_tag_name("main").item(0).unwrap();
let dynamic_text: Element = document.create_element("p").unwrap();
main.prepend_with_node_1(&dynamic_text).unwrap();
unsafe {
DYNAMIC_TEXT = Some(dynamic_text);
update_text();
}
set_timer();
}
static mut DYNAMIC_TEXT: Option<Element> = None;
static mut APPLES: i32 = 1;
static mut TREES: i32 = 0;
pub unsafe fn update_text() {
if let Some(dynamic_text) = DYNAMIC_TEXT.as_mut() {
dynamic_text.set_inner_html(&format!("You have {} apples and {} trees.", APPLES, TREES));
}
}
#[wasm_bindgen]
pub fn buy() {
unsafe {
if APPLES > 0 {
TREES += 1;
APPLES -= 1;
update_text();
}
}
}
fn collect_apples() {
unsafe {
APPLES += TREES;
update_text();
}
}
fn set_timer() {
let window = web_sys::window().unwrap();
let boxed_function = Box::new(collect_apples);
let closure = Closure::wrap(boxed_function as Box<dyn Fn()>);
// setInterval() has many different names in Rust because there is no overloading
window
.set_interval_with_callback_and_timeout_and_arguments_0(
closure.as_ref().unchecked_ref(),
5000,
)
.unwrap();
// Leak memory on purpose
closure.forget();
}
/*
* Safe implementation of the same as above
*/
use std::cell::RefCell;
use std::sync::atomic::{AtomicI32, Ordering};
use std::thread_local;
thread_local!(
static SAFE_DYNAMIC_TEXT: RefCell<Option<Element>> = RefCell::new(None);
);
static SAFE_APPLES: AtomicI32 = AtomicI32::new(1);
static SAFE_TREES: AtomicI32 = AtomicI32::new(0);
#[wasm_bindgen]
pub fn safe_init() {
utils::set_panic_hook();
// window and document have to be fetched from JS world
let window = web_sys::window().unwrap();
let document = window.document().unwrap();
let main = document.get_elements_by_tag_name("main").item(0).unwrap();
let dynamic_text: Element = document.create_element("p").unwrap();
main.prepend_with_node_1(&dynamic_text).unwrap();
SAFE_DYNAMIC_TEXT
.with(|maybe_dynamic_text| *maybe_dynamic_text.borrow_mut() = Some(dynamic_text));
safe_update_text();
safe_set_timer();
}
pub fn safe_update_text() {
SAFE_DYNAMIC_TEXT.with(|maybe_dynamic_text| {
if let Some(dynamic_text) = maybe_dynamic_text.borrow().as_ref() {
dynamic_text.set_inner_html(&format!(
"You have {} apples and {} trees.",
SAFE_APPLES.load(Ordering::Relaxed),
SAFE_TREES.load(Ordering::Relaxed)
))
}
})
}
#[wasm_bindgen]
pub fn safe_buy() {
if SAFE_APPLES.load(Ordering::Relaxed) > 0 {
SAFE_TREES.fetch_add(1, Ordering::Relaxed);
SAFE_APPLES.fetch_add(-1, Ordering::Relaxed);
safe_update_text();
}
}
fn safe_collect_apples() {
SAFE_APPLES.fetch_add(SAFE_TREES.load(Ordering::Relaxed), Ordering::Relaxed);
safe_update_text();
}
fn safe_set_timer() {
let window = web_sys::window().unwrap();
let boxed_function = Box::new(safe_collect_apples);
let closure = Closure::wrap(boxed_function as Box<dyn Fn()>);
// setInterval() has many different names in Rust because there is no overloading
window
.set_interval_with_callback_and_timeout_and_arguments_0(
closure.as_ref().unchecked_ref(),
5000,
)
.unwrap();
// Leak memory on purpose
closure.forget();
}