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use cstring::cstr;
use once_cell::sync::OnceCell;
use std::{
collections::HashMap,
future::Future,
pin::Pin,
sync::{Arc, Mutex},
task::{Context, Poll, Waker},
};
type JSValue = f32;
extern "C" {
fn _register(function: i32, code: i32);
fn _call(obj: JSValue, function: i32, a1_type: i32, a1: JSValue, a2_type: i32, a2: JSValue);
}
pub const UNDEFINED: JSValue = 0.0;
pub const FALSE: JSValue = 0.0;
pub const TRUE: JSValue = 1.0;
pub const JS_TYPE_NOTHING: i32 = 0;
pub const JS_TYPE_NUM: i32 = 1;
pub const JS_TYPE_STRING: i32 = 2;
pub const JS_TYPE_BOOL: i32 = 3;
pub const JS_TYPE_FUNCTION: i32 = 4;
pub fn register_js_function(function: i32, code: &str) {
unsafe { _register(function, cstr(code)) }
}
pub fn js_call_1(obj: f32, function: i32, a1_type: i32, a1: f32) {
unsafe { _call(obj, function, a1_type, a1, JS_TYPE_NOTHING, UNDEFINED) }
}
pub fn js_call_2(obj: f32, function: i32, a1_type: i32, a1: f32, a2_type: i32, a2: f32) {
unsafe { _call(obj, function, a1_type, a1, a2_type, a2) }
}
struct Callback {
cur_id: i32,
handlers: HashMap<i32, Arc<Mutex<Box<dyn Fn() -> () + Send + 'static>>>>,
}
pub fn to_string(s: &str) -> JSValue {
cstr(s) as f32
}
fn get_callbacks() -> &'static Mutex<Callback> {
static INSTANCE: OnceCell<Mutex<Callback>> = OnceCell::new();
INSTANCE.get_or_init(|| {
Mutex::new(Callback {
cur_id: 0,
handlers: HashMap::new(),
})
})
}
fn create_callback(cb: Box<dyn Fn() -> () + Send + 'static>) -> i32 {
let mut h = get_callbacks().lock().unwrap();
h.cur_id += 1;
let id = h.cur_id;
h.handlers.insert(id, Arc::new(Mutex::new(cb)));
return id;
}
pub struct CallbackFuture {
shared_state: Arc<Mutex<SharedState>>,
}
struct SharedState {
completed: bool,
waker: Option<Waker>,
}
impl Future for CallbackFuture {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut shared_state = self.shared_state.lock().unwrap();
if shared_state.completed {
Poll::Ready(())
} else {
shared_state.waker = Some(cx.waker().clone());
Poll::Pending
}
}
}
impl CallbackFuture {
pub fn create() -> (Self, f32) {
let shared_state = Arc::new(Mutex::new(SharedState {
completed: false,
waker: None,
}));
let thread_shared_state = shared_state.clone();
let id = create_callback(Box::new(move || {
let mut shared_state = thread_shared_state.lock().unwrap();
shared_state.completed = true;
if let Some(waker) = shared_state.waker.take() {
std::mem::drop(shared_state);
waker.wake()
}
}));
(CallbackFuture { shared_state }, id as f32)
}
}
#[no_mangle]
pub fn callback(id: i32) -> () {
let h = get_callbacks().lock().unwrap();
let handler_ref = h.handlers.get(&id).unwrap().clone();
std::mem::drop(h);
let handler = handler_ref.lock().unwrap();
handler()
}