scheme support refactoring

src/image.rs

@@ -2,7 +2,7 @@ use std::{marker::PhantomData, mem, slice::ChunksExactMut};
 
 use serde::{Deserialize, Serialize};
 
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub enum PixelFormat {
     Argb8888Le,
 }

src/keyboard.rs

@@ -1,12 +1,15 @@
-use std::{collections::HashMap, time::Instant};
+use std::{collections::HashMap, fmt::Debug};
 
 use crate::{
     graphics::{self, LazyCanvas},
     image::PixelFormat,
-    script::{Engine, Value},
+    script::{Engine, Func, ValTrait, Value},
     text::FontDb,
 };
 
+mod script;
+
+#[derive(Clone, Debug)]
 pub struct Popup {
     left: i32,
     top: i32,
@@ -21,6 +24,7 @@ pub struct PopupInfo<'b> {
     font_db: &'b mut FontDb,
 }
 
+#[derive(Clone, Debug)]
 pub struct Class<E: Engine> {
     pub supers: Vec<String>,
     pub methods: HashMap<String, E::Func>,
@@ -43,18 +47,24 @@ pub struct Keyboard<E: Engine> {
     fmt: PixelFormat,
     pub(crate) font_db: FontDb,
     is_first_draw: bool,
-    config_handlers: HashMap<
-        String,
-        Vec<(
-            usize,
-            Box<dyn 'static + FnMut(&Self, &str, &toml_edit::Value)>,
-        )>,
-    >,
-    timers: Vec<(Instant, Box<dyn 'static + FnOnce(&Self)>)>,
-    config_handler_id: usize,
-    pub(crate) user_data: HashMap<String, Value<E>>,
-    pub(crate) classes: HashMap<String, Class<E>>,
-    pub(crate) env: Option<crate::ScriptEnv<E>>,
+    pub(crate) user_data: HashMap<String, Value<Self>>,
+    pub(crate) classes: HashMap<String, Class<Self>>,
+    /// SAFETY: unsafe
+    engine: E,
+}
+impl<E: Engine> Debug for Keyboard<E> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Keyboard")
+            .field("layout", &self.layout)
+            .field("popup", &self.popup)
+            .field("width", &self.width)
+            .field("height", &self.height)
+            .field("fmt", &self.fmt)
+            .field("font_db", &self.font_db)
+            .field("is_first_draw", &self.is_first_draw)
+            .field("classes", &self.classes)
+            .finish_non_exhaustive()
+    }
 }
 
 impl<'b> PopupInfo<'b> {
@@ -127,15 +137,9 @@ pub struct DamageInfo {
     pub height: u32,
 }
 
-impl<E: Engine> Default for Keyboard<E> {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl<E: Engine> Keyboard<E> {
-    pub fn new() -> Self {
-        Self {
+impl<E: 'static + Engine> Keyboard<E> {
+    pub fn new(engine: E) -> Self {
+        let mut ret = Self {
             width: 720,
             height: 480,
             font_db: Default::default(),
@@ -143,16 +147,16 @@ impl<E: Engine> Keyboard<E> {
             layout: None,
             popup: None,
             is_first_draw: true,
-            config_handlers: HashMap::new(),
-            config_handler_id: 0,
-            timers: Vec::new(),
             user_data: HashMap::new(),
             classes: HashMap::new(),
-            env: None,
-        }
+            engine,
+        };
+        script::init_builtins(&mut ret);
         // ret.layout = Some(ret.create_layout());
-        // ret
+        ret
     }
+}
+impl<E: Engine> Keyboard<E> {
     pub fn size(&self) -> (u32, u32) {
         (self.width, self.height)
     }
@@ -189,24 +193,6 @@ impl<E: Engine> Keyboard<E> {
             is_first_draw: true,
         });*/
     }
-    pub fn _add_settings_handler(
-        &mut self,
-        key: &str,
-        handler: impl 'static + FnMut(&Self, &str, &toml_edit::Value),
-    ) -> usize {
-        let id = self.config_handler_id;
-        self.config_handler_id += 1;
-        self.config_handlers
-            .entry(key.to_owned())
-            .or_default()
-            .push((id, Box::new(handler)));
-        id
-    }
-    pub fn _remove_settings_handler(&mut self, key: &str, id: usize) {
-        if let Some(x) = self.config_handlers.get_mut(key) {
-            x.retain(|(i, _)| id != *i);
-        }
-    }
     pub fn hide(&mut self) {
         self.popup = None;
     }
@@ -235,10 +221,7 @@ impl<E: Engine> Keyboard<E> {
                 .and_then(|cls| cls.methods.get_mut("kbd/width-changed"))
                 .cloned()
             {
-                let mut env = self.env.take().unwrap();
-                env.call(self, &func, vec![Value::Symbol("en".into())])
-                    .unwrap();
-                self.env = Some(env);
+                func.call(self, vec![Value::Symbol("en".into())]).unwrap();
             }
             self.is_first_draw = false;
             if let Some(layout) = &mut self.layout {
@@ -361,3 +344,123 @@ impl<E: Engine> Keyboard<E> {
         layout
     }*/
 }
+
+#[repr(transparent)]
+pub struct ValueWrapper<E: Engine>(E::Value);
+impl<E: Engine> ValTrait for ValueWrapper<E> {
+    type Engine = Keyboard<E>;
+    fn from_val2(val: Value<Self::Engine>, engine: &mut Self::Engine) -> Self {
+        Self(E::Value::from_val2(val.convert(), &mut engine.engine))
+    }
+    fn from_val(val: Value<Self::Engine>) -> Self {
+        Self(E::Value::from_val(val.convert()))
+    }
+    fn to_val(&self) -> Value<Self::Engine> {
+        self.0.to_val().convert()
+    }
+    fn to_val2(&self, engine: &Self::Engine) -> Value<Self::Engine> {
+        self.0.to_val2(&engine.engine).convert()
+    }
+}
+#[repr(transparent)]
+#[derive(Debug)]
+pub struct FuncWrapper<E: Engine>(E::Func);
+impl<E: Engine> Clone for FuncWrapper<E>
+where
+    E::Func: Clone,
+{
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+impl<E: Engine> Ord for FuncWrapper<E>
+where
+    E::Func: Ord,
+{
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.0.cmp(&other.0)
+    }
+}
+impl<E: Engine> Eq for FuncWrapper<E> where E::Func: Eq {}
+impl<E: Engine> PartialOrd for FuncWrapper<E>
+where
+    E::Func: PartialOrd,
+{
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.0.cmp(&other.0))
+    }
+}
+impl<E: Engine> PartialEq for FuncWrapper<E>
+where
+    E::Func: PartialEq,
+{
+    fn eq(&self, other: &Self) -> bool {
+        self.0.eq(&other.0)
+    }
+}
+impl<E: Engine> Func for FuncWrapper<E> {
+    type BasicValue = <E::Func as Func>::BasicValue;
+    fn from_basic_value(v: Self::BasicValue) -> Self {
+        Self(E::Func::from_basic_value(v))
+    }
+    fn into_basic_value(self) -> Self::BasicValue {
+        self.0.into_basic_value()
+    }
+    type Engine = Keyboard<E>;
+    fn call(
+        &self,
+        engine: &mut Self::Engine,
+        args: Vec<Value<Self::Engine>>,
+    ) -> Result<Value<Self::Engine>, <Self::Engine as Engine>::Error> {
+        Ok(self
+            .0
+            .call(
+                &mut engine.engine,
+                args.into_iter().map(Value::convert).collect(),
+            )?
+            .convert())
+    }
+    fn unref(&mut self, engine: &mut Self::Engine) {
+        self.0.unref(&mut engine.engine);
+    }
+    fn add_ref(&mut self, engine: &mut Self::Engine) {
+        self.0.add_ref(&mut engine.engine);
+    }
+}
+
+impl<E: Engine> Engine for Keyboard<E> {
+    type Value = ValueWrapper<E>;
+    type Error = E::Error;
+    type Func = FuncWrapper<E>;
+    fn eval_t(&mut self, text: &str) -> Result<Value<Self>, Self::Error> {
+        Ok(self.engine.eval_t(text)?.convert())
+    }
+    fn gc(&mut self) {
+        self.engine.gc();
+    }
+    fn register(&mut self, name: &str, val: Value<Self>) {
+        self.engine.register(name, val.convert())
+    }
+    #[inline(always)]
+    fn register_func(
+        &mut self,
+        name: &'static str,
+        func: impl 'static + Fn(&mut Self, Vec<Value<Self>>) -> Result<Value<Self>, Self::Error>,
+    ) {
+        self.engine.register_func(name, move |a: &mut E, b| {
+            Ok(func(
+                // SAFETY: as long as engine isn't used directly by the Keyboard,
+                // and self is used as the engine itself, this is fine
+                unsafe {
+                    let ofs = std::mem::offset_of!(Self, engine);
+                    let ptr: *mut Self = ((a as *mut E) as *mut Self).byte_sub(ofs);
+                    &mut *ptr
+                },
+                // SAFETY: should have the same layout,
+                // because FuncWrapper is repr(transparent)
+                unsafe { std::mem::transmute::<Vec<Value<E>>, Vec<Value<Self>>>(b) },
+            )?
+            .convert())
+        })
+    }
+}

src/keyboard/script.rs

@@ -0,0 +1,469 @@
+use crate::{
+    graphics, image,
+    script::{Args, Engine, ErrorTrait, Func, Value},
+};
+
+use super::Keyboard;
+
+fn register<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 3], _>([cls, name, func]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/register"));
+    };
+    let Value::Symbol(cls) = cls else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/register",
+            "symbol",
+            &format!("{cls:?}"),
+        ));
+    };
+    let Value::Symbol(name) = name else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/register",
+            "symbol",
+            &format!("{name:?}"),
+        ));
+    };
+    let Value::Func(mut func) = func else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/register",
+            "function",
+            &format!("{func:?}"),
+        ));
+    };
+    func.add_ref(vm);
+    println!("register {cls:?} {name:?} {func:?}");
+    vm.classes
+        .entry(cls.into_owned())
+        .or_default()
+        .methods
+        .insert(name.into_owned(), func);
+    println!("done");
+
+    Ok(Value::Null)
+}
+
+fn class_define<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 2], _>([cls, supers]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/class-define"));
+    };
+    let Value::Symbol(cls) = cls else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/class-define",
+            "symbol",
+            &format!("{cls:?}"),
+        ));
+    };
+    let supers = match supers {
+        Value::Null => vec![],
+        Value::RevArray(supers) => supers,
+        _ => {
+            return Err(ErrorTrait::invalid_argt(
+                "kbd/class-define",
+                "list",
+                &format!("{supers:?}"),
+            ));
+        }
+    };
+    let supers = supers
+        .into_iter()
+        .rev()
+        .map(|sup| {
+            let Value::Symbol(sup) = sup else {
+                return Err(ErrorTrait::invalid_argt(
+                    "kbd/class-define",
+                    "list of symbols",
+                    &format!("list containing {sup:?}"),
+                ));
+            };
+            Ok(sup.into_owned())
+        })
+        .collect::<Result<Vec<_>, _>>()?;
+    println!("register {cls:?} {supers:?}");
+
+    vm.classes
+        .entry(cls.into_owned())
+        .or_default()
+        .supers
+        .extend(supers);
+    println!("done");
+    Ok(Value::Null)
+}
+
+fn call<E: Engine>(
+    vm: &mut Keyboard<E>,
+    mut args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    args.reverse();
+    let cls = args
+        .pop()
+        .ok_or_else(|| ErrorTrait::invalid_argc("kbd/call"))?;
+    let name = args
+        .pop()
+        .ok_or_else(|| ErrorTrait::invalid_argc("kbd/call"))?;
+    let Value::Symbol(cls) = cls else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/call",
+            "symbol",
+            &format!("{cls:?}"),
+        ));
+    };
+    let Value::Symbol(name) = name else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/call",
+            "symbol",
+            &format!("{name:?}"),
+        ));
+    };
+    fn call_func<E: Engine>(
+        func: &mut E::Func,
+        engine: &mut E,
+        args: Vec<Value<E>>,
+    ) -> Result<Value<E>, E::Error> {
+        func.call(engine, args)
+    }
+    let func = vm
+        .classes
+        .get_mut(cls.as_ref())
+        .and_then(|cls| cls.methods.get_mut(name.as_ref()).cloned());
+    if let Some(mut func) = func {
+        args.push(Value::Symbol(cls));
+        args.reverse();
+        call_func(&mut func, vm, args)
+    } else {
+        Err(ErrorTrait::from_str(
+            "kbd/call",
+            &format!("{cls}/{name} is not defined"),
+        ))
+    }
+}
+
+fn set_user_data<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 2], _>([k, mut v]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/set-user-data"));
+    };
+    let Value::Symbol(k) = k else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/set-user-data",
+            "symbol",
+            &format!("{k:?}"),
+        ));
+    };
+    println!("setting user data {k:?} to {v:?}");
+    if let Some(mut val) = vm.user_data.insert(k.into_owned(), v.clone()) {
+        // FIXME: theoretically this can unref data that's referenced elsewhere
+        val.unref(vm);
+    }
+    v.add_ref(vm);
+    Ok(Value::Null)
+}
+
+fn get_user_data<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 1], _>([k]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/get-user-data"));
+    };
+    let Value::Symbol(k) = k else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/get-user-data",
+            "symbol",
+            &format!("{k:?}"),
+        ));
+    };
+    println!("getting user data {k:?}");
+    Ok(vm
+        .user_data
+        .get(k.as_ref())
+        .cloned()
+        .unwrap_or(Value::Bool(false)))
+}
+
+fn add_to_i64<E: Engine>(name: &str, a: Value<E>, b: Value<E>) -> Result<i64, E::Error> {
+    Ok(match (a, b) {
+        (Value::Int(a), Value::Int(b)) => a.saturating_add(b),
+        (Value::Float(a), Value::Float(b)) => (a + b) as i64,
+        (Value::Int(a), Value::Float(b)) => (a as f64 + b) as i64,
+        (Value::Float(a), Value::Int(b)) => (a + b as f64) as i64,
+        x => {
+            return Err(E::Error::invalid_argt(
+                name,
+                "int or float",
+                &format!("{:?}", x.1),
+            ))
+        }
+    })
+}
+fn to_i64<E: Engine>(name: &str, x: Value<E>) -> Result<i64, E::Error> {
+    add_to_i64(name, x, Value::Int(0))
+}
+
+fn make_text<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 5], _>([xy, wh, text, font, font_size]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/make-text"));
+    };
+    let Value::Pair(xy) = xy else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-text",
+            "pair",
+            &format!("{xy:?}"),
+        ));
+    };
+    let Value::Pair(wh) = wh else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-text",
+            "pair",
+            &format!("{wh:?}"),
+        ));
+    };
+    let Value::String(text) = text else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-text",
+            "string",
+            &format!("{text:?}"),
+        ));
+    };
+    let Value::String(font) = font else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-text",
+            "string",
+            &format!("{font:?}"),
+        ));
+    };
+    let font_size = match font_size {
+        Value::Int(x) => x as f64,
+        Value::Float(x) => x,
+        _ => {
+            return Err(ErrorTrait::invalid_argt(
+                "kbd/make-text",
+                "string",
+                &format!("{font_size:?}"),
+            ))
+        }
+    };
+    let Some(font_handle) = vm.font_db.font_handle(&font) else {
+        return Err(ErrorTrait::from_str("kbd/make-text", "font not found"));
+    };
+    let (x, y) = *xy;
+    let (w, h) = *wh;
+    let x1 = to_i64("kbd/make-text", x.clone())?;
+    let y1 = to_i64("kbd/make-text", y.clone())?;
+    let x_w = add_to_i64("kbd/make-text", x, w)?;
+    let y_h = add_to_i64("kbd/make-text", y, h)?;
+    let (x, y) = (x1, y1);
+    let (w, h) = (x_w - x, y_h - y);
+    let halign = graphics::Alignment::Middle;
+    let valign = graphics::Alignment::Middle;
+    let direction = swash::shape::Direction::LeftToRight;
+    let script = swash::text::Script::Latin;
+    let color = image::ColorRgba([255, 0, 0, 255]);
+    // [xy, wh, text, font, font_size]
+    // println!("rendering text {text} of size {w}/{h} at {x}/{y} with font {font} {font_size}, color {color:?}, alignment {halign:?}/{valign:?}, script {script:?}, direction {direction:?}");
+    let text = graphics::WidgetEnum::Text(graphics::Text {
+        direction,
+        font_size: font_size as f32,
+        font_handle,
+        color,
+        halign,
+        valign,
+        script,
+        text: text.into(),
+        pos: graphics::Rect {
+            left: x as i32,
+            bottom: y as i32,
+            height: h as u32,
+            width: w as u32,
+        },
+    });
+    Value::from_serde(&text).map_err(|err| ErrorTrait::from_str("kbd/make-text", &err.to_string()))
+}
+
+fn make_rect<E: Engine>(
+    _vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let mut args = args.into_iter();
+    let Some(xy) = args.next() else {
+        return Err(ErrorTrait::invalid_argc("kbd/make-rect"));
+    };
+    let Some(wh) = args.next() else {
+        return Err(ErrorTrait::invalid_argc("kbd/make-rect"));
+    };
+    let mut round = 0.0f64;
+    while let Some(arg) = args.next() {
+        match arg {
+            Value::Symbol(x) if x == ":round-corners" => {
+                round = 1.0;
+                if let Some(arg) = args.next() {
+                    let Value::Float(arg) = arg else {
+                        return Err(ErrorTrait::invalid_argt(
+                            "kbd/make-rect",
+                            "float",
+                            &format!("{arg:?}"),
+                        ));
+                    };
+                    round = arg;
+                }
+            }
+            x => {
+                return Err(ErrorTrait::invalid_argt(
+                    "kbd/make-rect",
+                    "make-rect keyword arguments",
+                    &format!("{x:?}"),
+                ))
+            }
+        }
+    }
+    let Value::Pair(xy) = xy else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-rect",
+            "pair",
+            &format!("{xy:?}"),
+        ));
+    };
+    let Value::Pair(wh) = wh else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-rect",
+            "pair",
+            &format!("{wh:?}"),
+        ));
+    };
+    let (x, y) = *xy;
+    let (w, h) = *wh;
+    let x1 = to_i64("kbd/make-rect", x.clone())?;
+    let y1 = to_i64("kbd/make-rect", y.clone())?;
+    let x_w = add_to_i64("kbd/make-rect", x, w)?;
+    let y_h = add_to_i64("kbd/make-rect", y, h)?;
+    let (x, y) = (x1, y1);
+    let (w, h) = (x_w - x, y_h - y);
+    let color = image::ColorRgba([0, 0, 0, 255]);
+    // [xy, wh, text, font, font_size]
+    println!("rendering rect of size {w}/{h} at {x}/{y} with rounding {round}, color {color:?}");
+    let rect = graphics::WidgetEnum::Shape(graphics::SimpleShape {
+        col: color,
+        pos: graphics::Rect {
+            left: x as i32,
+            bottom: y as i32,
+            width: w as u32,
+            height: h as u32,
+        },
+        round_corners_ratio: round as f32,
+    });
+    Value::from_serde(&rect).map_err(|err| ErrorTrait::from_str("kbd/make-rect", &err.to_string()))
+}
+
+fn make_layout<E: Engine>(
+    _vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 1], _>([items]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/make-layout"));
+    };
+    let Value::RevArray(items) = items else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/make-layout",
+            "list",
+            &format!("{items:?}"),
+        ));
+    };
+    let mut layout = graphics::Layout::new();
+    for item in items.into_iter().rev() {
+        let Value::RevArray(mut item) = item else {
+            return Err(ErrorTrait::invalid_argt(
+                "kbd/make-layout",
+                "list of lists",
+                &format!("list with {item:?}"),
+            ));
+        };
+        let Some(Value::String(a)) = item.pop() else {
+            return Err(ErrorTrait::from_str(
+                "kbd/make-layout",
+                "each item's first element must be the item id",
+            ));
+        };
+        let item = Value::RevArray(item)
+            .to_serde()
+            .map_err(|err| ErrorTrait::from_str("kbd/make-layout", &err.to_string()))?;
+        // println!("{item:#?}");
+        layout.add_child(item, &a, None);
+    }
+    Value::from_serde(&layout)
+        .map_err(|err| ErrorTrait::from_str("kbd/make-layout", &err.to_string()))
+}
+
+fn width<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 0], _>([]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/width"));
+    };
+    println!("getting keyboard width");
+    Ok(Value::Int(vm.width.into()))
+}
+
+fn load_font<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 1], _>([path]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/load-font"));
+    };
+    let Value::String(path) = path else {
+        return Err(ErrorTrait::invalid_argt(
+            "kbd/load-font",
+            "string",
+            &format!("{path:?}"),
+        ));
+    };
+    println!("loading font {path:?}");
+    vm.font_db
+        .load_font(path)
+        .map(|()| Value::Null)
+        .map_err(|err| ErrorTrait::from_str("kbd/load-font", &err.to_string()))
+}
+
+fn set_layout<E: Engine>(
+    vm: &mut Keyboard<E>,
+    args: Args<Keyboard<E>>,
+) -> Result<Value<Keyboard<E>>, <Keyboard<E> as Engine>::Error> {
+    let Ok::<[Value<_>; 1], _>([layout]) = args.try_into() else {
+        return Err(ErrorTrait::invalid_argc("kbd/set-layout"));
+    };
+    let layout: graphics::Layout = layout
+        .to_serde()
+        .map_err(|err| ErrorTrait::from_str("kbd/set-layout", &err.to_string()))?;
+    vm.layout = Some(layout);
+    Ok(Value::Null)
+}
+
+pub fn init_builtins<E: 'static + Engine>(engine: &mut Keyboard<E>) {
+    const DEFS: &str = include_str!("../../defs.scm");
+    engine.eval_t(DEFS).unwrap();
+    engine.gc();
+    engine.register_func("kbd/register", register);
+    engine.register_func("kbd/class-define", class_define);
+    engine.register_func("kbd/call", call);
+    engine.register_func("kbd/set-user-data", set_user_data);
+    engine.register_func("kbd/get-user-data", get_user_data);
+    engine.register_func("kbd/make-text", make_text);
+    engine.register(":round-corners", Value::new_symbol(":round-corners"));
+    engine.register_func("kbd/make-rect", make_rect);
+    engine.register_func("kbd/make-layout", make_layout);
+    engine.register_func("kbd/width", width);
+    engine.register_func("kbd/load-font", load_font);
+    engine.register_func("kbd/set-layout", set_layout);
+    engine.gc();
+}

src/main.rs

@@ -1,7 +1,6 @@
 #![allow(clippy::type_complexity)]
-use std::{cell::RefCell, rc::Rc};
 
-use script::{Engine, ErrorTrait, Func, Value};
+use script::Engine;
 #[cfg(feature = "wayland")]
 pub use wayland_protocols_misc;
 
@@ -17,509 +16,12 @@ mod text;
 #[cfg(feature = "wayland")]
 mod wayland;
 
-#[derive(Default)]
-struct ScriptEnv<E: Engine>(E, Rc<RefCell<Keyboard<E>>>);
-
-impl<E: Engine> ScriptEnv<E> {
-    fn eval(&mut self, kbd: &mut Keyboard<E>, text: &str) -> Result<Value<E>, E::Error> {
-        std::mem::swap(kbd, &mut (*self.1).borrow_mut());
-        let ret = self.0.eval_t(text);
-        std::mem::swap(kbd, &mut (*self.1).borrow_mut());
-        ret
-    }
-    fn call(
-        &mut self,
-        kbd: &mut Keyboard<E>,
-        func: &E::Func,
-        args: Vec<Value<E>>,
-    ) -> Result<Value<E>, E::Error> {
-        std::mem::swap(kbd, &mut (*self.1).borrow_mut());
-        // work with kbd1
-        let ret = func.call(&mut self.0, args);
-        std::mem::swap(kbd, &mut (*self.1).borrow_mut());
-        ret
-    }
-}
-
-fn new_script_env() -> ScriptEnv<impl Engine> {
-    let mut engine = script::create_engine();
-    const DEFS: &str = include_str!("../defs.scm");
-    let ctx: Rc<RefCell<Keyboard<_>>> = Rc::default();
-    engine.eval_t(DEFS).unwrap();
-    engine.gc();
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/register",
-        Box::new(move |vm, args| {
-            let Ok::<[Value<_>; 3], _>([cls, name, func]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/register"));
-            };
-            let Value::Symbol(cls) = cls else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/register",
-                    "symbol",
-                    &format!("{cls:?}"),
-                ));
-            };
-            let Value::Symbol(name) = name else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/register",
-                    "symbol",
-                    &format!("{name:?}"),
-                ));
-            };
-            let Value::Func(mut func) = func else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/register",
-                    "function",
-                    &format!("{func:?}"),
-                ));
-            };
-            func.add_ref(vm);
-            println!("register {cls:?} {name:?} {func:?}");
-            (*ctx1)
-                .borrow_mut()
-                .classes
-                .entry(cls.into_owned())
-                .or_default()
-                .methods
-                .insert(name.into_owned(), func);
-            println!("done");
-
-            Ok(Value::Null)
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/class-define",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 2], _>([cls, supers]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/class-define"));
-            };
-            let Value::Symbol(cls) = cls else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/class-define",
-                    "symbol",
-                    &format!("{cls:?}"),
-                ));
-            };
-            let supers = match supers {
-                Value::Null => vec![],
-                Value::RevArray(supers) => supers,
-                _ => {
-                    return Err(ErrorTrait::invalid_argt(
-                        "kbd/class-define",
-                        "list",
-                        &format!("{supers:?}"),
-                    ));
-                }
-            };
-            let supers = supers
-                .into_iter()
-                .rev()
-                .map(|sup| {
-                    let Value::Symbol(sup) = sup else {
-                        return Err(ErrorTrait::invalid_argt(
-                            "kbd/class-define",
-                            "list of symbols",
-                            &format!("list containing {sup:?}"),
-                        ));
-                    };
-                    Ok(sup.into_owned())
-                })
-                .collect::<Result<Vec<_>, _>>()?;
-            println!("register {cls:?} {supers:?}");
-
-            (*ctx1)
-                .borrow_mut()
-                .classes
-                .entry(cls.into_owned())
-                .or_default()
-                .supers
-                .extend(supers);
-            println!("done");
-            Ok(Value::Null)
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/call",
-        Box::new(move |vm, mut args| {
-            args.reverse();
-            let cls = args
-                .pop()
-                .ok_or_else(|| ErrorTrait::invalid_argc("kbd/call"))?;
-            let name = args
-                .pop()
-                .ok_or_else(|| ErrorTrait::invalid_argc("kbd/call"))?;
-            let Value::Symbol(cls) = cls else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/call",
-                    "symbol",
-                    &format!("{cls:?}"),
-                ));
-            };
-            let Value::Symbol(name) = name else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/call",
-                    "symbol",
-                    &format!("{name:?}"),
-                ));
-            };
-            fn call_func<E: Engine>(
-                func: &mut E::Func,
-                engine: &mut E,
-                args: Vec<Value<E>>,
-            ) -> Result<Value<E>, E::Error> {
-                func.call(engine, args)
-            }
-            let func = (*ctx1)
-                .borrow_mut()
-                .classes
-                .get_mut(cls.as_ref())
-                .and_then(|cls| cls.methods.get_mut(name.as_ref()).cloned());
-            if let Some(mut func) = func {
-                args.push(Value::Symbol(cls));
-                args.reverse();
-                call_func(&mut func, vm, args)
-            } else {
-                Err(ErrorTrait::from_str(
-                    "kbd/call",
-                    &format!("{cls}/{name} is not defined"),
-                ))
-            }
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/set-user-data",
-        Box::new(move |vm, args| {
-            let Ok::<[Value<_>; 2], _>([k, mut v]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/set-user-data"));
-            };
-            let Value::Symbol(k) = k else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/set-user-data",
-                    "symbol",
-                    &format!("{k:?}"),
-                ));
-            };
-            println!("setting user data {k:?} to {v:?}");
-            if let Some(mut val) = (*ctx1)
-                .borrow_mut()
-                .user_data
-                .insert(k.into_owned(), v.clone())
-            {
-                // FIXME: theoretically this can unref data that's referenced elsewhere
-                val.unref(vm);
-            }
-            v.add_ref(vm);
-            Ok(Value::Null)
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/get-user-data",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 1], _>([k]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/get-user-data"));
-            };
-            let Value::Symbol(k) = k else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/get-user-data",
-                    "symbol",
-                    &format!("{k:?}"),
-                ));
-            };
-            println!("getting user data {k:?}");
-            Ok((*ctx1)
-                .borrow()
-                .user_data
-                .get(k.as_ref())
-                .cloned()
-                .unwrap_or(Value::Bool(false)))
-        }),
-    );
-    fn add_to_i64<E: Engine>(name: &str, a: Value<E>, b: Value<E>) -> Result<i64, E::Error> {
-        Ok(match (a, b) {
-            (Value::Int(a), Value::Int(b)) => a.saturating_add(b),
-            (Value::Float(a), Value::Float(b)) => (a + b) as i64,
-            (Value::Int(a), Value::Float(b)) => (a as f64 + b) as i64,
-            (Value::Float(a), Value::Int(b)) => (a + b as f64) as i64,
-            x => {
-                return Err(E::Error::invalid_argt(
-                    name,
-                    "int or float",
-                    &format!("{:?}", x.1),
-                ))
-            }
-        })
-    }
-    fn to_i64<E: Engine>(name: &str, x: Value<E>) -> Result<i64, E::Error> {
-        add_to_i64(name, x, Value::Int(0))
-    }
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/make-text",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 5], _>([xy, wh, text, font, font_size]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/make-text"));
-            };
-            let Value::Pair(xy) = xy else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-text",
-                    "pair",
-                    &format!("{xy:?}"),
-                ));
-            };
-            let Value::Pair(wh) = wh else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-text",
-                    "pair",
-                    &format!("{wh:?}"),
-                ));
-            };
-            let Value::String(text) = text else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-text",
-                    "string",
-                    &format!("{text:?}"),
-                ));
-            };
-            let Value::String(font) = font else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-text",
-                    "string",
-                    &format!("{font:?}"),
-                ));
-            };
-            let font_size = match font_size {
-                Value::Int(x) => x as f64,
-                Value::Float(x) => x,
-                _ => {
-                    return Err(ErrorTrait::invalid_argt(
-                        "kbd/make-text",
-                        "string",
-                        &format!("{font_size:?}"),
-                    ))
-                }
-            };
-            let Some(font_handle) = ctx1.borrow_mut().font_db.font_handle(&font) else {
-                return Err(ErrorTrait::from_str("kbd/make-text", "font not found"));
-            };
-            let (x, y) = *xy;
-            let (w, h) = *wh;
-            let x1 = to_i64("kbd/make-text", x.clone())?;
-            let y1 = to_i64("kbd/make-text", y.clone())?;
-            let x_w = add_to_i64("kbd/make-text", x, w)?;
-            let y_h = add_to_i64("kbd/make-text", y, h)?;
-            let (x, y) = (x1, y1);
-            let (w, h) = (x_w - x, y_h - y);
-            let halign = graphics::Alignment::Middle;
-            let valign = graphics::Alignment::Middle;
-            let direction = swash::shape::Direction::LeftToRight;
-            let script = swash::text::Script::Latin;
-            let color = image::ColorRgba([255, 0, 0, 255]);
-            // [xy, wh, text, font, font_size]
-            // println!("rendering text {text} of size {w}/{h} at {x}/{y} with font {font} {font_size}, color {color:?}, alignment {halign:?}/{valign:?}, script {script:?}, direction {direction:?}");
-            let text = graphics::WidgetEnum::Text(graphics::Text {
-                direction,
-                font_size: font_size as f32,
-                font_handle,
-                color,
-                halign,
-                valign,
-                script,
-                text: text.into(),
-                pos: graphics::Rect {
-                    left: x as i32,
-                    bottom: y as i32,
-                    height: h as u32,
-                    width: w as u32,
-                },
-            });
-            Value::from_serde(&text)
-                .map_err(|err| ErrorTrait::from_str("kbd/make-text", &err.to_string()))
-        }),
-    );
-    engine.register(":round-corners", Value::new_symbol(":round-corners"));
-    engine.register_func(
-        "kbd/make-rect",
-        Box::new(|_vm, args| {
-            let mut args = args.into_iter();
-            let Some(xy) = args.next() else {
-                return Err(ErrorTrait::invalid_argc("kbd/make-rect"));
-            };
-            let Some(wh) = args.next() else {
-                return Err(ErrorTrait::invalid_argc("kbd/make-rect"));
-            };
-            let mut round = 0.0f64;
-            while let Some(arg) = args.next() {
-                match arg {
-                    Value::Symbol(x) if x == ":round-corners" => {
-                        round = 1.0;
-                        if let Some(arg) = args.next() {
-                            let Value::Float(arg) = arg else {
-                                return Err(ErrorTrait::invalid_argt(
-                                    "kbd/make-rect",
-                                    "float",
-                                    &format!("{arg:?}"),
-                                ));
-                            };
-                            round = arg;
-                        }
-                    }
-                    x => {
-                        return Err(ErrorTrait::invalid_argt(
-                            "kbd/make-rect",
-                            "make-rect keyword arguments",
-                            &format!("{x:?}"),
-                        ))
-                    }
-                }
-            }
-            let Value::Pair(xy) = xy else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-rect",
-                    "pair",
-                    &format!("{xy:?}"),
-                ));
-            };
-            let Value::Pair(wh) = wh else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-rect",
-                    "pair",
-                    &format!("{wh:?}"),
-                ));
-            };
-            let (x, y) = *xy;
-            let (w, h) = *wh;
-            let x1 = to_i64("kbd/make-rect", x.clone())?;
-            let y1 = to_i64("kbd/make-rect", y.clone())?;
-            let x_w = add_to_i64("kbd/make-rect", x, w)?;
-            let y_h = add_to_i64("kbd/make-rect", y, h)?;
-            let (x, y) = (x1, y1);
-            let (w, h) = (x_w - x, y_h - y);
-            let color = image::ColorRgba([0, 0, 0, 255]);
-            // [xy, wh, text, font, font_size]
-            println!(
-                "rendering rect of size {w}/{h} at {x}/{y} with rounding {round}, color {color:?}"
-            );
-            let rect = graphics::WidgetEnum::Shape(graphics::SimpleShape {
-                col: color,
-                pos: graphics::Rect {
-                    left: x as i32,
-                    bottom: y as i32,
-                    width: w as u32,
-                    height: h as u32,
-                },
-                round_corners_ratio: round as f32,
-            });
-            Value::from_serde(&rect)
-                .map_err(|err| ErrorTrait::from_str("kbd/make-rect", &err.to_string()))
-        }),
-    );
-    engine.register_func(
-        "kbd/make-layout",
-        Box::new(|_vm, args| {
-            let Ok::<[Value<_>; 1], _>([items]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/make-layout"));
-            };
-            let Value::RevArray(items) = items else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/make-layout",
-                    "list",
-                    &format!("{items:?}"),
-                ));
-            };
-            let mut layout = graphics::Layout::new();
-            for item in items.into_iter().rev() {
-                let Value::RevArray(mut item) = item else {
-                    return Err(ErrorTrait::invalid_argt(
-                        "kbd/make-layout",
-                        "list of lists",
-                        &format!("list with {item:?}"),
-                    ));
-                };
-                let Some(Value::String(a)) = item.pop() else {
-                    return Err(ErrorTrait::from_str(
-                        "kbd/make-layout",
-                        "each item's first element must be the item id",
-                    ));
-                };
-                let item = Value::RevArray(item)
-                    .to_serde()
-                    .map_err(|err| ErrorTrait::from_str("kbd/make-layout", &err.to_string()))?;
-                // println!("{item:#?}");
-                layout.add_child(item, &a, None);
-            }
-            Value::from_serde(&layout)
-                .map_err(|err| ErrorTrait::from_str("kbd/make-layout", &err.to_string()))
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/width",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 0], _>([]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/width"));
-            };
-            println!("getting keyboard width");
-            Ok(Value::Int(ctx1.borrow().width.into()))
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/load-font",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 1], _>([path]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/load-font"));
-            };
-            let Value::String(path) = path else {
-                return Err(ErrorTrait::invalid_argt(
-                    "kbd/load-font",
-                    "string",
-                    &format!("{path:?}"),
-                ));
-            };
-            println!("loading font {path:?}");
-            (*ctx1)
-                .borrow_mut()
-                .font_db
-                .load_font(path)
-                .map(|()| Value::Null)
-                .map_err(|err| ErrorTrait::from_str("kbd/load-font", &err.to_string()))
-        }),
-    );
-    let ctx1 = ctx.clone();
-    engine.register_func(
-        "kbd/set-layout",
-        Box::new(move |_vm, args| {
-            let Ok::<[Value<_>; 1], _>([layout]) = args.try_into() else {
-                return Err(ErrorTrait::invalid_argc("kbd/set-layout"));
-            };
-            let layout: graphics::Layout = layout
-                .to_serde()
-                .map_err(|err| ErrorTrait::from_str("kbd/set-layout", &err.to_string()))?;
-            (*ctx1).borrow_mut().layout = Some(layout);
-            Ok(Value::Null)
-        }),
-    );
-    engine.gc();
-    ScriptEnv(engine, ctx)
-}
-
-fn assert_type<T>(_: &T, _: &T) {}
-
 fn main() {
     env_logger::init();
-    let mut env = new_script_env();
-    // engine.gc();
+    let engine = script::create_engine();
+    let mut kbd: Keyboard<_> = Keyboard::new(engine);
     let s = std::fs::read_to_string("tmp.scm").unwrap();
-    let mut kbd = Keyboard::new();
-    assert_type(&kbd, &(*env.1.borrow()));
-    env.eval(&mut kbd, &s).unwrap();
-    kbd.env = Some(env);
+    kbd.eval_t(&s).unwrap();
 
     #[cfg(feature = "wayland")]
     if std::env::var_os("WAYLAND_DISPLAY").is_some() {

src/script.rs

@@ -42,6 +42,22 @@ impl<E: Engine> Clone for Value<E> {
 }
 
 impl<E: Engine> Value<E> {
+    pub fn convert<R: Engine>(self) -> Value<R>
+    where
+        R::Func: Func<BasicValue = <E::Func as Func>::BasicValue>,
+    {
+        match self {
+            Self::Null => Value::Null,
+            Self::Bool(x) => Value::Bool(x),
+            Self::Int(x) => Value::Int(x),
+            Self::Float(x) => Value::Float(x),
+            Self::String(x) => Value::String(x),
+            Self::Symbol(x) => Value::Symbol(x),
+            Self::RevArray(x) => Value::RevArray(x.into_iter().map(Self::convert).collect()),
+            Self::Pair(x) => Value::new_pair(x.0.convert(), x.1.convert()),
+            Self::Func(x) => Value::Func(x.convert::<R>()),
+        }
+    }
     pub fn new_symbol(s: impl Into<Cow<'static, str>>) -> Self {
         Self::Symbol(s.into())
     }
@@ -168,24 +184,16 @@ impl<E: Engine> Hash for Value<E> {
     }
 }
 
-pub trait ToVal {
-    type Engine: Engine;
-    fn to_val2(&self, _engine: &Self::Engine) -> Value<Self::Engine> {
-        self.to_val()
-    }
-    fn to_val(&self) -> Value<Self::Engine> {
-        unimplemented!()
-    }
-}
-
 pub trait ErrorTrait {
     fn from_str(name: &str, s: &str) -> Self;
     fn invalid_argc(name: &str) -> Self;
     fn invalid_argt(name: &str, exp: &str, found: &str) -> Self;
 }
 
+pub type Args<E> = Vec<Value<E>>;
+
 pub trait Engine: Debug + Sized {
-    type Value: FromVal<Engine = Self> + ToVal<Engine = Self>;
+    type Value: ValTrait<Engine = Self>;
     type Error: Debug + ErrorTrait;
     type Func: Clone + Debug + Ord + Func<Engine = Self>;
     fn eval_t(&mut self, text: &str) -> Result<Value<Self>, Self::Error>;
@@ -194,32 +202,40 @@ pub trait Engine: Debug + Sized {
     // this doesnt have to be box, but it being a box saves some binary size
     fn new_func(
         &mut self,
-        name: &'static str,
-        func: Box<
-            dyn 'static + Fn(&mut Self, Vec<Value<Self>>) -> Result<Value<Self>, Self::Error>,
-        >,
-    ) -> Self::Func;
+        _name: &'static str,
+        _func: Box<dyn 'static + Fn(&mut Self, Args<Self>) -> Result<Value<Self>, Self::Error>>,
+    ) -> Self::Func {
+        unimplemented!()
+    }
+    #[inline(always)]
     fn register_func(
         &mut self,
         name: &'static str,
-        func: Box<
-            dyn 'static + Fn(&mut Self, Vec<Value<Self>>) -> Result<Value<Self>, Self::Error>,
-        >,
+        func: impl 'static + Fn(&mut Self, Args<Self>) -> Result<Value<Self>, Self::Error>,
     ) {
-        let func = self.new_func(name, func);
+        let func = self.new_func(name, Box::new(func));
         self.register(name, Value::Func(func));
     }
 }
 
-pub trait Func {
+pub trait Func: Sized {
     type Engine: Engine;
+    type BasicValue;
     fn call(
         &self,
         engine: &mut Self::Engine,
-        args: Vec<Value<Self::Engine>>,
+        args: Args<Self::Engine>,
     ) -> Result<Value<Self::Engine>, <Self::Engine as Engine>::Error>;
     fn add_ref(&mut self, engine: &mut Self::Engine);
     fn unref(&mut self, engine: &mut Self::Engine);
+    fn from_basic_value(v: Self::BasicValue) -> Self;
+    fn into_basic_value(self) -> Self::BasicValue;
+    fn convert<R: Engine>(self) -> R::Func
+    where
+        R::Func: Func<BasicValue = Self::BasicValue>,
+    {
+        R::Func::from_basic_value(self.into_basic_value())
+    }
 }
 
 #[derive(Debug)]
@@ -288,10 +304,17 @@ impl PartialOrd for MarwoodFunc {
 
 impl Func for MarwoodFunc {
     type Engine = marwood::vm::Vm;
+    type BasicValue = Self;
+    fn into_basic_value(self) -> Self::BasicValue {
+        self
+    }
+    fn from_basic_value(v: Self::BasicValue) -> Self {
+        v
+    }
     fn call(
         &self,
         engine: &mut Self::Engine,
-        args: Vec<Value<Self::Engine>>,
+        args: Args<Self::Engine>,
     ) -> Result<Value<Self::Engine>, <Self::Engine as Engine>::Error> {
         use marwood::vm::{lambda::Lambda, opcode::OpCode, vcell::VCell};
         let (lambda, is_cont) = match self {
@@ -437,15 +460,13 @@ impl Engine for marwood::vm::Vm {
     fn register(&mut self, name: &str, val: Value<Self>) {
         let symbol = self.heap.put(marwood::vm::vcell::VCell::symbol(name));
         let slot = self.globenv.get_binding(symbol.as_ptr().unwrap());
-        let val = FromVal::from_val2(val, self);
+        let val = ValTrait::from_val2(val, self);
         self.globenv.put_slot(slot, val);
     }
     fn new_func(
         &mut self,
         name: &'static str,
-        func: Box<
-            dyn 'static + Fn(&mut Self, Vec<Value<Self>>) -> Result<Value<Self>, Self::Error>,
-        >,
+        func: Box<dyn 'static + Fn(&mut Self, Args<Self>) -> Result<Value<Self>, Self::Error>>,
     ) -> Self::Func {
         let func = marwood::vm::vcell::VCell::builtin(name, move |vm| {
             // log::info!("calling {name}");
@@ -457,7 +478,7 @@ impl Engine for marwood::vm::Vm {
             args.reverse();
             // log::info!("calling! {name}");
             match func(vm, args) {
-                Ok(x) => Ok(FromVal::from_val2(x, vm)),
+                Ok(x) => Ok(ValTrait::from_val2(x, vm)),
                 Err(err) => Err(err),
             }
             // log::info!("exiting {name}");
@@ -472,8 +493,14 @@ impl Engine for marwood::vm::Vm {
     }
 }
 
-pub trait FromVal: Sized {
+pub trait ValTrait: Sized {
     type Engine: Engine;
+    fn to_val2(&self, _engine: &Self::Engine) -> Value<Self::Engine> {
+        self.to_val()
+    }
+    fn to_val(&self) -> Value<Self::Engine> {
+        unimplemented!()
+    }
     fn from_val(_val: Value<Self::Engine>) -> Self {
         unimplemented!()
     }
@@ -483,7 +510,7 @@ pub trait FromVal: Sized {
 }
 
 #[cfg(feature = "steel")]
-impl FromVal for steel::SteelVal {
+impl ValTrait for steel::SteelVal {
     type Engine = steel::steel_vm::engine::Engine;
     fn from_val(val: Value) -> Self {
         match val {
@@ -512,7 +539,7 @@ impl FromVal for steel::SteelVal {
     }
 }
 
-impl FromVal for marwood::vm::vcell::VCell {
+impl ValTrait for marwood::vm::vcell::VCell {
     type Engine = marwood::vm::Vm;
     fn from_val2(val: Value<Self::Engine>, engine: &mut Self::Engine) -> Self {
         match val {
@@ -568,10 +595,6 @@ impl FromVal for marwood::vm::vcell::VCell {
             },
         }
     }
-}
-
-impl ToVal for marwood::vm::vcell::VCell {
-    type Engine = marwood::vm::Vm;
     fn to_val2(&self, engine: &Self::Engine) -> Value<Self::Engine> {
         match self {
             Self::Bool(val) => Value::Bool(*val),

src/text.rs

@@ -1,5 +1,6 @@
 use std::{
     collections::HashMap,
+    fmt::Debug,
     hash::Hash,
     io,
     path::Path,
@@ -22,11 +23,6 @@ impl CacheKey {
         static KEY: AtomicU64 = AtomicU64::new(1);
         Self(KEY.fetch_add(1, Ordering::Relaxed))
     }
-
-    /// Returns the underlying value of the key.
-    pub fn value(self) -> u64 {
-        self.0
-    }
 }
 
 impl Default for CacheKey {
@@ -69,6 +65,13 @@ pub struct FontDb {
     fonts: HashMap<String, FontHandle>,
     glyph_cache: HashMap<GlyphCacheKey, (Instant, Option<Image>)>,
 }
+impl Debug for FontDb {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FontDb")
+            .field("fonts", &self.fonts)
+            .finish_non_exhaustive()
+    }
+}
 
 impl FontDb {
     pub fn load_font(&mut self, file: impl AsRef<Path>) -> io::Result<()> {