[oden] JavaScript, god help me

oden-js-sys/src/static-functions.rs

@@ -50,6 +50,8 @@ extern "C" {
         magic: ::std::os::raw::c_int,
     ) -> JSValue;
     fn JS_MakeException_real() -> JSValue;
+    fn JS_MakeNull_real() -> JSValue;
+    fn JS_MakeUndefined_real() -> JSValue;
     fn JS_ValueGetPtr_real(v: JSValue) -> *mut ::std::os::raw::c_void;
 }
 
@@ -218,6 +220,14 @@ pub unsafe fn JS_MakeException() -> JSValue {
     JS_MakeException_real()
 }
 
+pub unsafe fn JS_MakeNull() -> JSValue {
+    JS_MakeNull_real()
+}
+
+pub unsafe fn JS_MakeUndefined() -> JSValue {
+    JS_MakeUndefined_real()
+}
+
 pub unsafe fn JS_ValueGetPtr(v: JSValue) -> *mut ::std::os::raw::c_void {
     JS_ValueGetPtr_real(v)
 }

oden-js-sys/static-functions.c

@@ -129,6 +129,14 @@ JSValue JS_MakeException_real() {
     return JS_EXCEPTION;
 }
 
+JSValue JS_MakeNull_real() {
+    return JS_NULL;
+}
+
+JSValue JS_MakeUndefined_real() {
+    return JS_UNDEFINED;
+}
+
 void *JS_ValueGetPtr_real(JSValue val) {
     return JS_VALUE_GET_PTR(val);
 }

oden-js/src/value.rs

@@ -328,6 +328,18 @@ impl ValueRef {
             ctx.check_exception(sys::JS_GetModuleExport(ctx.ctx, module, c_value.into_raw()))
         }
     }
+
+    pub fn call(&self, ctx: &ContextRef) -> Result<Value> {
+        unsafe {
+            ctx.check_exception(sys::JS_Call(
+                ctx.ctx,
+                self.val,
+                sys::JS_MakeUndefined(),
+                0,
+                std::ptr::null_mut(),
+            ))
+        }
+    }
 }
 
 impl<'ctx> fmt::Debug for ValueRef {
@@ -357,6 +369,20 @@ impl Value {
             rt: Runtime::from_raw(unsafe { sys::JS_GetRuntime(ctx.ctx) }),
         }
     }
+
+    pub fn null(ctx: &ContextRef) -> Self {
+        Value {
+            value: ValueRef::from_raw(unsafe { sys::JS_MakeNull() }),
+            rt: Runtime::from_raw(unsafe { sys::JS_GetRuntime(ctx.ctx) }),
+        }
+    }
+
+    pub fn undefined(ctx: &ContextRef) -> Self {
+        Value {
+            value: ValueRef::from_raw(unsafe { sys::JS_MakeUndefined() }),
+            rt: Runtime::from_raw(unsafe { sys::JS_GetRuntime(ctx.ctx) }),
+        }
+    }
 }
 
 impl Deref for Value {

src/lib.rs

@@ -356,6 +356,8 @@ pub async fn run() {
     let mut state = State::new(window).await;
 
     let context = script::ScriptContext::new();
+    context.init();
+
     event_loop.run(move |event, _, control_flow| {
         control_flow.set_poll();
 

src/main.js

@@ -0,0 +1,9 @@
+function init() {
+  // console.log("Hello world!");
+}
+
+function update() {}
+
+function draw() {}
+
+export { init, update, draw }

src/script.rs

@@ -1,7 +1,10 @@
 use oden_js as js;
 
 pub struct ScriptContext {
-    _context: js::Context,
+    context: js::Context,
+    init: js::Value,
+    update: js::Value,
+    draw: js::Value,
 }
 
 impl ScriptContext {
@@ -13,10 +16,40 @@ impl ScriptContext {
         context.add_intrinsic_bigdecimal();
         context.add_intrinsic_operators();
 
-        ScriptContext { _context: context }
+        let js = include_str!("main.js");
+        let module = context
+            .load_module(js, "main.js")
+            .expect("Unable to load main");
+
+        let init = module
+            .get_module_export(&context, "init")
+            .expect("Unable to fetch init");
+        let update = module
+            .get_module_export(&context, "update")
+            .expect("Unable to fetch update");
+        let draw = module
+            .get_module_export(&context, "draw")
+            .expect("Unable to fetch draw");
+
+        ScriptContext {
+            context,
+            init,
+            update,
+            draw,
+        }
     }
 
-    pub fn update(&self) {}
-
-    pub fn render(&self) {}
+    pub fn init(&self) {
+        self.init.call(&self.context).expect("Exception in init");
+    }
+
+    pub fn update(&self) {
+        self.update
+            .call(&self.context)
+            .expect("Exception in update");
+    }
+
+    pub fn render(&self) {
+        self.draw.call(&self.context).expect("Exception in draw");
+    }
 }