Scheduler lives in Lua

src/lib.rs

@@ -1,5 +1,6 @@
 pub mod runner;
 pub mod context;
+pub(crate) mod scheduler;
 
 #[cfg(test)]
 mod tests;

src/runner/runner.rs

@@ -60,9 +60,10 @@ impl Runner{
 		}
 		//this makes set_app_data shut up about the lifetime
 		self.lua.set_app_data::<&'static mut rbx_dom_weak::WeakDom>(unsafe{core::mem::transmute(&mut context.dom)});
+		self.lua.set_app_data::<crate::scheduler::Scheduler>(crate::scheduler::Scheduler::default());
 		Ok(Runnable{
 			lua:self.lua,
-			_lifetime:&std::marker::PhantomData
+			_lifetime:&std::marker::PhantomData,
 		})
 	}
 }
@@ -70,20 +71,32 @@ impl Runner{
 //Runnable is the same thing but has context set, which it holds the lifetime for.
 pub struct Runnable<'a>{
 	lua:mlua::Lua,
-	_lifetime:&'a std::marker::PhantomData<()>
+	_lifetime:&'a std::marker::PhantomData<()>,
 }
 impl Runnable<'_>{
 	pub fn drop_context(self)->Runner{
 		self.lua.remove_app_data::<&'static mut rbx_dom_weak::WeakDom>();
+		self.lua.remove_app_data::<crate::scheduler::Scheduler>();
 		Runner{
 			lua:self.lua,
 		}
 	}
 	pub fn run_script(&self,script:super::instance::Instance)->Result<(),Error>{
 		let (name,source)=super::instance::get_name_source(&self.lua,script).map_err(Error::RustLua)?;
-		self.lua.globals().set("script",script).map_err(Error::RustLua)?;
-		self.lua.load(source.as_str())
-		.set_name(name)
-		.exec().map_err(|error|Error::Lua{source,error})
+		let fenv=self.lua.create_table().map_err(Error::RustLua)?;
+		//there's gotta be a more concise way to do this
+		for pair in self.lua.globals().pairs::<mlua::Value,mlua::Value>(){
+			let (k,v)=pair.map_err(Error::RustLua)?;
+			fenv.raw_set(k,v).map_err(Error::RustLua)?;
+		}
+		fenv.raw_set("script",script).map_err(Error::RustLua)?;
+		let f=self.lua.load(source.as_str())
+		.set_name(name).into_function().map_err(Error::RustLua)?;
+		f.set_environment(fenv).map_err(Error::RustLua)?;
+		let thread=self.lua.create_thread(f).map_err(Error::RustLua)?;
+		thread.resume::<mlua::MultiValue>(()).map_err(|error|Error::Lua{source,error})?;
+		// wait() is called from inside Lua and goes to a rust function that schedules the thread and then yields
+		// No need to schedule the thread here
+		Ok(())
 	}
 }

src/scheduler.rs

@@ -0,0 +1,55 @@
+pub use tick::Tick;
+mod tick{
+	#[derive(Clone,Copy,Default,Hash,PartialEq,Eq,PartialOrd,Ord)]
+	pub struct Tick(u64);
+	impl Tick{
+		pub const fn new(value:u64)->Self{
+			Self(value)
+		}
+		pub const fn get(&self)->u64{
+			self.0
+		}
+	}
+	impl std::ops::Add<u64> for Tick{
+		type Output=Self;
+		fn add(self,rhs:u64)->Self::Output{
+			Self(self.0+rhs)
+		}
+	}
+	impl std::ops::Sub<u64> for Tick{
+		type Output=Self;
+		fn sub(self,rhs:u64)->Self::Output{
+			Self(self.0-rhs)
+		}
+	}
+	impl std::ops::AddAssign<u64> for Tick{
+		fn add_assign(&mut self,rhs:u64){
+			self.0+=rhs;
+		}
+	}
+	impl std::ops::SubAssign<u64> for Tick{
+		fn sub_assign(&mut self,rhs:u64){
+			self.0-=rhs;
+		}
+	}
+}
+#[derive(Default)]
+pub struct Scheduler{
+	tick:Tick,
+	schedule:std::collections::HashMap<Tick,Vec<mlua::Thread>>,
+}
+
+impl Scheduler{
+	pub const fn tick(&self)->Tick{
+		self.tick
+	}
+	pub fn schedule_thread(&mut self,delay:u64,thread:mlua::Thread){
+		self.schedule.entry(self.tick+delay.min(1))
+		.or_insert(Vec::new())
+		.push(thread);
+	}
+	pub fn tick_threads(&mut self)->Option<Vec<mlua::Thread>>{
+		self.tick+=1;
+		self.schedule.remove(&self.tick)
+	}
+}