Backup commit

stackline-wasm/Cargo.toml

@@ -16,6 +16,7 @@ serde_json = "1.0"
 serde = { version = "1", features = ["derive"] }
 
 stackline = { path = "../stackline", features = [], default-features = false }
+veccell = { version = "0.4.0", features = ["serde"] }
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
@@ -32,6 +33,7 @@ wee_alloc = { version = "0.4.5", optional = true }
 
 web-sys = { version = "0.3", features = ["console"] }
 js-sys = "0.3"
+serde-wasm-bindgen = "0.4.3"
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.13"

stackline-wasm/src/lib-old.rs

@@ -0,0 +1,477 @@
+mod utils;
+
+use js_sys::Function;
+use serde::{Deserialize, Serialize};
+use wasm_bindgen::prelude::*;
+
+use stackline::pane::Pane as SLPane;
+use stackline::signal::Signal as SLSignal;
+use stackline::signal::Value;
+use stackline::tile::AnyTile;
+use stackline::tile::FullTile as SLFullTile;
+use stackline::utils::Direction;
+use stackline::world::World as SLWorld;
+use stackline::text::TextSurface;
+
+// TODO: refactor:
+// - make everything camelCase
+// - clearly separate serialized properties/functions from non-serialized
+// - add javascript code to the classes?
+
+// 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 struct World(SLWorld);
+
+#[wasm_bindgen(start)]
+pub fn set_panic() {
+    utils::set_panic_hook();
+}
+
+#[wasm_bindgen]
+pub fn available_tiles() -> Vec<JsValue> {
+    AnyTile::available()
+        .iter()
+        .map(|name| JsValue::from_str(name))
+        .collect()
+}
+
+#[wasm_bindgen]
+impl World {
+    /// Creates a new World instance
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Self {
+        Self(SLWorld::new())
+    }
+
+    pub fn deserialize(serialized: &JsValue) -> Option<World> {
+        serialized.into_serde().map_err(|err| {
+            err!("Error while deserializing World: {:?}", err);
+        }).ok().map(|world| World(world))
+    }
+
+    pub fn serialize(&self) -> JsValue {
+        JsValue::from_serde(&self.0).map_err(|err| {
+            err!("Error while serializing World: {:?}", err);
+        }).unwrap_or(JsValue::NULL)
+    }
+
+    /// Initializes the World, making it ready to run
+    pub fn init(&mut self) {
+        self.0.init();
+    }
+
+    #[inline]
+    pub fn step(&mut self) {
+        self.0.step();
+    }
+
+    pub fn run(&mut self, steps: usize) {
+        for _ in 0..steps {
+            self.step();
+        }
+    }
+
+    pub fn set_blink_duration(&mut self, blink_duration: f64) {
+        use std::time::Duration;
+        self.0
+            .set_blink_duration(Duration::from_secs_f64(blink_duration));
+    }
+
+    #[allow(non_snake_case)]
+    pub fn toString(&self) -> String {
+        format!("{:#}", self.0)
+    }
+
+    /// NOTE: We have to [`Clone`] the FullTile
+    pub fn get(&self, x: i32, y: i32) -> Option<FullTile> {
+        self.0.get((x, y)).map(|tile| FullTile((*tile).clone()))
+    }
+
+    pub fn set(&mut self, x: i32, y: i32, tile: FullTile) {
+        if let Some(tile_ref) = self.0.get_mut((x, y)) {
+            *tile_ref = tile.0;
+        } else if cfg!(debug_assertions) {
+            err!("Index out of bound: {}:{}", x, y);
+        }
+    }
+
+    pub fn get_pane(&self, name: String) -> Option<Pane> {
+        self.0.get_pane(&name).map(|pane| Pane(pane.clone()))
+    }
+
+    pub fn set_pane(&mut self, name: String, pane: Pane) {
+        self.0.set_pane(name, pane.0);
+    }
+
+    pub fn panes(&self) -> Vec<JsValue> {
+        self.0.panes().keys().map(|key| {
+            JsValue::from_str(key)
+        }).collect()
+    }
+
+    pub fn draw(&self, x: i32, y: i32, width: usize, height: usize) -> Vec<u32> {
+        let mut surface = TextSurface::new(width, height);
+
+        self.0.draw(x, y, &mut surface);
+
+        #[derive(Serialize)]
+        struct Char {
+            ch: char,
+            fg: (u8, u8, u8),
+            bg: Option<(u8, u8, u8)>,
+        }
+
+        fn to_u32(red: u8, green: u8, blue: u8) -> u32 {
+            0xff000000 | (red as u32).checked_shl(16).unwrap() | (green as u32).checked_shl(8).unwrap() | (blue as u32)
+        }
+
+        surface.iter().map(|ch| {
+            vec![
+                ch.ch as u32,
+                to_u32(ch.fg.red, ch.fg.green, ch.fg.blue),
+                ch.bg.map(|bg| to_u32(bg.red, bg.green, bg.blue)).unwrap_or(0)
+            ].into_iter()
+        }).flatten().collect::<Vec<_>>()
+    }
+}
+
+#[wasm_bindgen]
+pub struct Pane(SLPane);
+
+#[wasm_bindgen]
+impl Pane {
+    #[wasm_bindgen(constructor)]
+    pub fn empty(width: usize, height: usize) -> Option<Pane> {
+        SLPane::empty(width, height).map(|pane| Self(pane))
+    }
+
+    #[allow(non_snake_case)]
+    pub fn toString(&self) -> String {
+        format!("{:#?}", self.0)
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn width(&self) -> usize {
+        self.0.width().get()
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_width(&mut self, width: usize) {
+        let height = self.0.height().get();
+
+        self.0.resize(width, height).unwrap_or_else(|| {
+            err!("Error while resizing Pane");
+        });
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn height(&self) -> usize {
+        self.0.height().get()
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_height(&mut self, height: usize) {
+        let width = self.0.width().get();
+
+        self.0.resize(width, height).unwrap_or_else(|| {
+            err!("Error while resizing Pane");
+        });
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn position(&self) -> Vec<i32> {
+        let (x, y) = self.0.position();
+        vec![x, y]
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn x(&self) -> i32 {
+        self.0.position().0
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn y(&self) -> i32 {
+        self.0.position().1
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_x(&mut self, value: i32) {
+        let mut pos = self.0.position();
+        pos.0 = value;
+        self.0.set_position(pos);
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_y(&mut self, value: i32) {
+        let mut pos = self.0.position();
+        pos.1 = value;
+        self.0.set_position(pos);
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_position(&mut self, position: &[i32]) {
+        if let [x, y] = position[..] {
+            self.0.set_position((x, y));
+        }
+    }
+
+    pub fn get(&self, x: usize, y: usize) -> Option<FullTile> {
+        self.0.get((x, y)).map(|tile| FullTile((*tile).clone()))
+    }
+
+    pub fn set(&mut self, x: usize, y: usize, tile: FullTile) {
+        if let Some(target) = self.0.get_mut((x, y)) {
+            *target = tile.0;
+        }
+    }
+
+    pub fn serialize(&self) -> JsValue {
+        JsValue::from_serde(&self.0).map_err(|err| {
+            err!("Error serializing Pane: {:?}", err);
+        }).unwrap_or(JsValue::NULL)
+    }
+
+    pub fn deserialize(value: JsValue) -> Option<Pane> {
+        value.into_serde::<SLPane>().map_err(|err| {
+            err!("Error deserializing Pane: {:?}", err);
+        }).ok().map(|pane| Pane(pane))
+    }
+
+    /// NOTE: `self` must not be part of world
+    pub fn blit(&self, x: i32, y: i32, world: &mut World) {
+        for pane in world.0.panes().values() {
+            if pane as *const SLPane == &self.0 as *const SLPane {
+                panic!("Cannot blit to a World containing self");
+            }
+        }
+
+        for (dx, dy, tile) in self.0.tiles_iter() {
+            let x = x + dx as i32;
+            let y = y + dy as i32;
+            world.set(x, y, FullTile((*tile).clone()));
+        }
+    }
+
+    pub fn to_text(&self) -> String {
+        let mut surface = TextSurface::new(self.0.width().get(), self.0.height().get());
+
+        self.0.draw(0, 0, &mut surface, stackline::utils::Blink::default());
+
+        format!("{:#}", surface)
+    }
+}
+
+#[derive(Clone, Debug)]
+#[wasm_bindgen]
+pub struct FullTile(SLFullTile);
+
+#[wasm_bindgen]
+impl FullTile {
+    pub fn empty() -> Self {
+        FullTile(SLFullTile::new(None))
+    }
+
+    #[wasm_bindgen(constructor)]
+    pub fn new(name: &str) -> Option<FullTile> {
+        AnyTile::new(name).map(|tile| FullTile(SLFullTile::new(Some(tile))))
+    }
+
+    pub fn clone(&self) -> FullTile {
+        <Self as Clone>::clone(self)
+    }
+
+    #[allow(non_snake_case)]
+    pub fn toString(&self) -> String {
+        format!("{:#?}", self.0)
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn signal(&self) -> JsValue {
+        self.0.signal().and_then(|signal| JsValue::from_serde(signal).ok()).unwrap_or(JsValue::NULL)
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_signal(&mut self, signal: JsValue) {
+        if signal.is_null() {
+            self.0.set_signal(None);
+        } else {
+            match signal.into_serde() {
+                Ok(signal) => {
+                    self.0.set_signal(Some(signal));
+                }
+                Err(err) => {
+                    err!("Couldn't serialize Signal: {:?}", err);
+                }
+            }
+        }
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn tile(&self) -> JsValue {
+        self.0
+            .get()
+            .map(|tile| {
+                JsValue::from_serde(tile)
+                    .map_err(|err| {
+                        err!("Error while serializing AnyTile: {}", err);
+                    })
+                    .ok()
+            })
+            .flatten()
+            .unwrap_or(JsValue::UNDEFINED)
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_tile(&mut self, tile: JsValue) {
+        if tile.is_null() || tile.is_undefined() {
+            self.0.set(None);
+        } else {
+            match tile.into_serde::<AnyTile>() {
+                Ok(tile) => self.0.set(Some(tile)),
+                Err(err) => err!("Error while deserializing AnyTile: {}", err),
+            }
+        }
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn state(&self) -> JsValue {
+        JsValue::from_serde(&self.0.state()).expect("Error while serializing State")
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_state(&mut self, state: &JsValue) {
+        if let Ok(state) = state.into_serde() {
+            self.0.set_state(state);
+        }
+    }
+
+    pub fn schema(&self) -> JsValue {
+        use serde_json::Value;
+        use stackline::tile::{Tile, TileSchema};
+
+        fn construct_value(schema: TileSchema) -> Value {
+            match schema {
+                TileSchema::Tuple(arr) => {
+                    Value::Array(arr.into_iter().map(construct_value).collect())
+                }
+                TileSchema::Map(map) => Value::Object(
+                    map.into_iter()
+                        .map(|(key, value)| (key, construct_value(value)))
+                        .collect(),
+                ),
+                TileSchema::Value(label, ty) => Value::String(format!("{}:{}", label, ty)),
+            }
+        }
+
+        if let Some(tile) = self.0.get() {
+            JsValue::from_serde(&construct_value(tile.schema()))
+                .expect("Error while serializing TileSchema")
+        } else {
+            JsValue::UNDEFINED
+        }
+    }
+
+    pub fn map_tile(&mut self, callback: &Function) {
+        let res = callback
+            .call1(&JsValue::NULL, &self.tile())
+            .expect("Error while calling javascript callback");
+        self.set_tile(res);
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+#[serde(untagged)]
+enum UntaggedValue {
+    Number(f64),
+    String(String),
+}
+
+impl From<&'_ Value> for UntaggedValue {
+    fn from(value: &'_ Value) -> Self {
+        match value {
+            Value::Number(x) => Self::Number(*x),
+            Value::String(x) => Self::String(x.clone()),
+        }
+    }
+}
+
+impl From<Value> for UntaggedValue {
+    fn from(value: Value) -> Self {
+        match value {
+            Value::Number(x) => Self::Number(x),
+            Value::String(x) => Self::String(x),
+        }
+    }
+}
+
+impl From<UntaggedValue> for Value {
+    fn from(value: UntaggedValue) -> Self {
+        match value {
+            UntaggedValue::Number(x) => Self::Number(x),
+            UntaggedValue::String(x) => Self::String(x),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+#[wasm_bindgen]
+pub struct Signal(SLSignal);
+
+#[wasm_bindgen]
+impl Signal {
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Self {
+        Self(SLSignal::empty(Direction::Up))
+    }
+
+    /// Returns a read-only array
+    #[wasm_bindgen(getter)]
+    pub fn stack(&self) -> JsValue {
+        JsValue::from_serde(
+            &self
+                .0
+                .stack()
+                .iter()
+                .collect::<Vec<_>>(),
+        )
+        .unwrap()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn direction(&self) -> JsValue {
+        JsValue::from_serde(&self.0.direction()).expect("Couldn't serialize Direction")
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_direction(&mut self, direction: JsValue) {
+        match direction.into_serde() {
+            Ok(dir) => {
+                self.0.set_direction(dir);
+            }
+            Err(err) => {
+                err!("Couldn't serialize Direction: {:?}", err);
+            }
+        }
+    }
+
+    pub fn serialize(&self) -> JsValue {
+        JsValue::from_serde(&self.0).map_err(|err| {
+            err!("Error while serializing Signal: {:?}", err);
+        }).unwrap_or(JsValue::NULL)
+    }
+
+    pub fn push(&mut self, value: JsValue) {
+        if let Some(num) = value.as_f64() {
+            self.0.push(Value::Number(num));
+        } else if let Some(string) = value.as_string() {
+            self.0.push(Value::String(string));
+        } else {
+            panic!("Invalid value: expected number or string, got {:?}", value);
+        }
+    }
+}

stackline-wasm/src/lib.rs

@@ -1,477 +1,171 @@
-mod utils;
+#![allow(non_snake_case)]
+
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::ops::Deref;
 
-use js_sys::Function;
-use serde::{Deserialize, Serialize};
 use wasm_bindgen::prelude::*;
 
-use stackline::pane::Pane as SLPane;
+use stackline::{
-use stackline::signal::Signal as SLSignal;
+    world::World as SLWorld,
-use stackline::signal::Value;
+    signal::Signal as SLSignal,
-use stackline::tile::AnyTile;
+    signal::Value,
-use stackline::tile::FullTile as SLFullTile;
+    tile::AnyTile,
-use stackline::utils::Direction;
+    tile::FullTile as SLFullTile,
-use stackline::world::World as SLWorld;
+};
-use stackline::text::TextSurface;
+use veccell::VecRef;
 
-// TODO: refactor:
+mod utils;
-// - make everything camelCase
-// - clearly separate serialized properties/functions from non-serialized
-// - add javascript code to the classes?
 
-// 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]
+macro_rules! js_ser {
-pub struct World(SLWorld);
+    ( $type:expr, $value:expr ) => {
+        serde_wasm_bindgen::to_value($value).map_err(|err| {
+            err!(concat!("Error while serializing ", $type, ": {:?}"), err);
+        }).ok()
+    };
+}
 
-#[wasm_bindgen(start)]
+macro_rules! js_de {
-pub fn set_panic() {
+    ( $type:ty, $value:expr ) => {
-    utils::set_panic_hook();
+        serde_wasm_bindgen::from_value::<$type>($value).map_err(|err| {
+            err!(concat!(
+                "Error while deserializing ",
+                stringify!($type),
+                ": {:?}",
+            ), err);
+        }).ok()
+    };
 }
 
 #[wasm_bindgen]
-pub fn available_tiles() -> Vec<JsValue> {
+#[derive(Clone)]
-    AnyTile::available()
+pub struct World(Rc<RefCell<SLWorld>>);
-        .iter()
-        .map(|name| JsValue::from_str(name))
-        .collect()
-}
 
 #[wasm_bindgen]
 impl World {
-    /// Creates a new World instance
     #[wasm_bindgen(constructor)]
     pub fn new() -> Self {
-        Self(SLWorld::new())
+        Self(Rc::new(RefCell::new(SLWorld::new())))
     }
 
     pub fn deserialize(serialized: &JsValue) -> Option<World> {
         serialized.into_serde().map_err(|err| {
             err!("Error while deserializing World: {:?}", err);
-        }).ok().map(|world| World(world))
+        }).ok().map(|world| {
+            Self(Rc::new(RefCell::new(world)))
+        })
     }
 
     pub fn serialize(&self) -> JsValue {
-        JsValue::from_serde(&self.0).map_err(|err| {
+        js_ser!("World", &*self.0.borrow()).unwrap_or(JsValue::NULL)
-            err!("Error while serializing World: {:?}", err);
-        }).unwrap_or(JsValue::NULL)
     }
 
-    /// Initializes the World, making it ready to run
+    pub fn init(&self) {
-    pub fn init(&mut self) {
+        self.0.borrow_mut().init();
-        self.0.init();
     }
 
-    #[inline]
+    pub fn step(&self) {
-    pub fn step(&mut self) {
+        self.0.borrow_mut().step();
-        self.0.step();
     }
 
-    pub fn run(&mut self, steps: usize) {
+    pub fn run(&self, steps: usize) {
+        let mut borrowed = self.0.borrow_mut();
+
         for _ in 0..steps {
-            self.step();
+            borrowed.step();
         }
     }
 
-    pub fn set_blink_duration(&mut self, blink_duration: f64) {
+    pub fn setBlinkDuration(&mut self, blink_duration: f64) {
         use std::time::Duration;
+
         self.0
+            .borrow_mut()
             .set_blink_duration(Duration::from_secs_f64(blink_duration));
     }
 
-    #[allow(non_snake_case)]
+    pub fn getSerialized(&self, x: i32, y: i32) -> JsValue {
-    pub fn toString(&self) -> String {
-        format!("{:#}", self.0)
-    }
-
-    /// NOTE: We have to [`Clone`] the FullTile
-    pub fn get(&self, x: i32, y: i32) -> Option<FullTile> {
-        self.0.get((x, y)).map(|tile| FullTile((*tile).clone()))
-    }
-
-    pub fn set(&mut self, x: i32, y: i32, tile: FullTile) {
-        if let Some(tile_ref) = self.0.get_mut((x, y)) {
-            *tile_ref = tile.0;
-        } else if cfg!(debug_assertions) {
-            err!("Index out of bound: {}:{}", x, y);
-        }
-    }
-
-    pub fn get_pane(&self, name: String) -> Option<Pane> {
-        self.0.get_pane(&name).map(|pane| Pane(pane.clone()))
-    }
-
-    pub fn set_pane(&mut self, name: String, pane: Pane) {
-        self.0.set_pane(name, pane.0);
-    }
-
-    pub fn panes(&self) -> Vec<JsValue> {
-        self.0.panes().keys().map(|key| {
-            JsValue::from_str(key)
-        }).collect()
-    }
-
-    pub fn draw(&self, x: i32, y: i32, width: usize, height: usize) -> Vec<u32> {
-        let mut surface = TextSurface::new(width, height);
-
-        self.0.draw(x, y, &mut surface);
-
-        #[derive(Serialize)]
-        struct Char {
-            ch: char,
-            fg: (u8, u8, u8),
-            bg: Option<(u8, u8, u8)>,
-        }
-
-        fn to_u32(red: u8, green: u8, blue: u8) -> u32 {
-            0xff000000 | (red as u32).checked_shl(16).unwrap() | (green as u32).checked_shl(8).unwrap() | (blue as u32)
-        }
-
-        surface.iter().map(|ch| {
-            vec![
-                ch.ch as u32,
-                to_u32(ch.fg.red, ch.fg.green, ch.fg.blue),
-                ch.bg.map(|bg| to_u32(bg.red, bg.green, bg.blue)).unwrap_or(0)
-            ].into_iter()
-        }).flatten().collect::<Vec<_>>()
-    }
-}
-
-#[wasm_bindgen]
-pub struct Pane(SLPane);
-
-#[wasm_bindgen]
-impl Pane {
-    #[wasm_bindgen(constructor)]
-    pub fn empty(width: usize, height: usize) -> Option<Pane> {
-        SLPane::empty(width, height).map(|pane| Self(pane))
-    }
-
-    #[allow(non_snake_case)]
-    pub fn toString(&self) -> String {
-        format!("{:#?}", self.0)
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn width(&self) -> usize {
-        self.0.width().get()
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_width(&mut self, width: usize) {
-        let height = self.0.height().get();
-
-        self.0.resize(width, height).unwrap_or_else(|| {
-            err!("Error while resizing Pane");
-        });
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn height(&self) -> usize {
-        self.0.height().get()
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_height(&mut self, height: usize) {
-        let width = self.0.width().get();
-
-        self.0.resize(width, height).unwrap_or_else(|| {
-            err!("Error while resizing Pane");
-        });
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn position(&self) -> Vec<i32> {
-        let (x, y) = self.0.position();
-        vec![x, y]
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn x(&self) -> i32 {
-        self.0.position().0
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn y(&self) -> i32 {
-        self.0.position().1
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_x(&mut self, value: i32) {
-        let mut pos = self.0.position();
-        pos.0 = value;
-        self.0.set_position(pos);
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_y(&mut self, value: i32) {
-        let mut pos = self.0.position();
-        pos.1 = value;
-        self.0.set_position(pos);
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_position(&mut self, position: &[i32]) {
-        if let [x, y] = position[..] {
-            self.0.set_position((x, y));
-        }
-    }
-
-    pub fn get(&self, x: usize, y: usize) -> Option<FullTile> {
-        self.0.get((x, y)).map(|tile| FullTile((*tile).clone()))
-    }
-
-    pub fn set(&mut self, x: usize, y: usize, tile: FullTile) {
-        if let Some(target) = self.0.get_mut((x, y)) {
-            *target = tile.0;
-        }
-    }
-
-    pub fn serialize(&self) -> JsValue {
-        JsValue::from_serde(&self.0).map_err(|err| {
-            err!("Error serializing Pane: {:?}", err);
-        }).unwrap_or(JsValue::NULL)
-    }
-
-    pub fn deserialize(value: JsValue) -> Option<Pane> {
-        value.into_serde::<SLPane>().map_err(|err| {
-            err!("Error deserializing Pane: {:?}", err);
-        }).ok().map(|pane| Pane(pane))
-    }
-
-    /// NOTE: `self` must not be part of world
-    pub fn blit(&self, x: i32, y: i32, world: &mut World) {
-        for pane in world.0.panes().values() {
-            if pane as *const SLPane == &self.0 as *const SLPane {
-                panic!("Cannot blit to a World containing self");
-            }
-        }
-
-        for (dx, dy, tile) in self.0.tiles_iter() {
-            let x = x + dx as i32;
-            let y = y + dy as i32;
-            world.set(x, y, FullTile((*tile).clone()));
-        }
-    }
-
-    pub fn to_text(&self) -> String {
-        let mut surface = TextSurface::new(self.0.width().get(), self.0.height().get());
-
-        self.0.draw(0, 0, &mut surface, stackline::utils::Blink::default());
-
-        format!("{:#}", surface)
-    }
-}
-
-#[derive(Clone, Debug)]
-#[wasm_bindgen]
-pub struct FullTile(SLFullTile);
-
-#[wasm_bindgen]
-impl FullTile {
-    pub fn empty() -> Self {
-        FullTile(SLFullTile::new(None))
-    }
-
-    #[wasm_bindgen(constructor)]
-    pub fn new(name: &str) -> Option<FullTile> {
-        AnyTile::new(name).map(|tile| FullTile(SLFullTile::new(Some(tile))))
-    }
-
-    pub fn clone(&self) -> FullTile {
-        <Self as Clone>::clone(self)
-    }
-
-    #[allow(non_snake_case)]
-    pub fn toString(&self) -> String {
-        format!("{:#?}", self.0)
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn signal(&self) -> JsValue {
-        self.0.signal().and_then(|signal| JsValue::from_serde(signal).ok()).unwrap_or(JsValue::NULL)
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_signal(&mut self, signal: JsValue) {
-        if signal.is_null() {
-            self.0.set_signal(None);
-        } else {
-            match signal.into_serde() {
-                Ok(signal) => {
-                    self.0.set_signal(Some(signal));
-                }
-                Err(err) => {
-                    err!("Couldn't serialize Signal: {:?}", err);
-                }
-            }
-        }
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn tile(&self) -> JsValue {
         self.0
-            .get()
+            .borrow()
-            .map(|tile| {
+            .get((x, y))
-                JsValue::from_serde(tile)
+            .and_then(|tile| {
-                    .map_err(|err| {
+                js_ser!("FullTile", &*tile)
-                        err!("Error while serializing AnyTile: {}", err);
-                    })
-                    .ok()
             })
-            .flatten()
+            .unwrap_or(JsValue::NULL)
-            .unwrap_or(JsValue::UNDEFINED)
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_tile(&mut self, tile: JsValue) {
-        if tile.is_null() || tile.is_undefined() {
-            self.0.set(None);
-        } else {
-            match tile.into_serde::<AnyTile>() {
-                Ok(tile) => self.0.set(Some(tile)),
-                Err(err) => err!("Error while deserializing AnyTile: {}", err),
-            }
-        }
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn state(&self) -> JsValue {
-        JsValue::from_serde(&self.0.state()).expect("Error while serializing State")
-    }
-
-    #[wasm_bindgen(setter)]
-    pub fn set_state(&mut self, state: &JsValue) {
-        if let Ok(state) = state.into_serde() {
-            self.0.set_state(state);
-        }
     }
 
-    pub fn schema(&self) -> JsValue {
+    pub fn setSerialized(&mut self, x: i32, y: i32, value: JsValue) {
-        use serde_json::Value;
+        let deserialized = js_de!(SLFullTile, value).unwrap();
-        use stackline::tile::{Tile, TileSchema};
 
-        fn construct_value(schema: TileSchema) -> Value {
+        if let Some(tile) = self.0
-            match schema {
+            .borrow_mut()
-                TileSchema::Tuple(arr) => {
+            .get_mut((x, y)) {
-                    Value::Array(arr.into_iter().map(construct_value).collect())
+            *tile = deserialized;
-                }
-                TileSchema::Map(map) => Value::Object(
-                    map.into_iter()
-                        .map(|(key, value)| (key, construct_value(value)))
-                        .collect(),
-                ),
-                TileSchema::Value(label, ty) => Value::String(format!("{}:{}", label, ty)),
         }
     }
 
-        if let Some(tile) = self.0.get() {
+    pub fn getRef(&self, x: i32, y: i32) -> Option<FullTileRef> {
-            JsValue::from_serde(&construct_value(tile.schema()))
+        if let Some((pane_name, _pane, x, y)) = self.0.borrow().get_pane_at((x, y)) {
-                .expect("Error while serializing TileSchema")
+            Some(FullTileRef {
+                world: Rc::clone(&self.0),
+                pane: pane_name.to_string(),
+                x,
+                y,
+            })
         } else {
-            JsValue::UNDEFINED
+            None
         }
     }
 
-    pub fn map_tile(&mut self, callback: &Function) {
+    pub fn toString(&self) -> String {
-        let res = callback
+        format!("{:#}", self.0.borrow())
-            .call1(&JsValue::NULL, &self.tile())
-            .expect("Error while calling javascript callback");
-        self.set_tile(res);
     }
 }
 
-#[derive(Serialize, Deserialize, Clone)]
+// impl Deref for World {
-#[serde(untagged)]
+//     type Target = SLWorld;
-enum UntaggedValue {
-    Number(f64),
-    String(String),
-}
 
-impl From<&'_ Value> for UntaggedValue {
+//     fn deref(&self) -> &SLWorld {
-    fn from(value: &'_ Value) -> Self {
+//         self.0.borrow()
-        match value {
+//     }
-            Value::Number(x) => Self::Number(*x),
+// }
-            Value::String(x) => Self::String(x.clone()),
-        }
-    }
-}
 
-impl From<Value> for UntaggedValue {
+#[wasm_bindgen]
-    fn from(value: Value) -> Self {
+pub struct FullTileRef {
-        match value {
+    world: Rc<RefCell<SLWorld>>,
-            Value::Number(x) => Self::Number(x),
+    pane: String,
-            Value::String(x) => Self::String(x),
+    pub x: usize,
-        }
+    pub y: usize,
-    }
-}
-
-impl From<UntaggedValue> for Value {
-    fn from(value: UntaggedValue) -> Self {
-        match value {
-            UntaggedValue::Number(x) => Self::Number(x),
-            UntaggedValue::String(x) => Self::String(x),
-        }
-    }
 }
 
-#[derive(Clone, Debug)]
+impl FullTileRef {
-#[wasm_bindgen]
+    fn with<F: FnOnce(&SLFullTile)>(&self, cb: F) {
-pub struct Signal(SLSignal);
+        let guard = self.world
+            .borrow();
+        let reference = guard
+            .get_pane(&self.pane)
+            .expect("Invalid FullTile: no pane")
+            .get((self.x, self.y))
+            .expect("Invalid FullTile: tile out of bounds");
 
-#[wasm_bindgen]
+        cb(&*reference);
-impl Signal {
-    #[wasm_bindgen(constructor)]
-    pub fn new() -> Self {
-        Self(SLSignal::empty(Direction::Up))
     }
 
-    /// Returns a read-only array
+    fn with_mut<F: FnOnce(&mut SLFullTile)>(&self, cb: F) {
-    #[wasm_bindgen(getter)]
+        let mut guard = self.world
-    pub fn stack(&self) -> JsValue {
+            .borrow_mut();
-        JsValue::from_serde(
+        let reference = guard
-            &self
+            .get_pane_mut(&self.pane)
-                .0
+            .expect("Invalid FullTile: no pane")
-                .stack()
+            .get_mut((self.x, self.y))
-                .iter()
+            .expect("Invalid FullTile: tile out of bounds");
-                .collect::<Vec<_>>(),
-        )
-        .unwrap()
-    }
-
-    #[wasm_bindgen(getter)]
-    pub fn direction(&self) -> JsValue {
-        JsValue::from_serde(&self.0.direction()).expect("Couldn't serialize Direction")
-    }
 
-    #[wasm_bindgen(setter)]
+        cb(&mut *reference);
-    pub fn set_direction(&mut self, direction: JsValue) {
-        match direction.into_serde() {
-            Ok(dir) => {
-                self.0.set_direction(dir);
-            }
-            Err(err) => {
-                err!("Couldn't serialize Direction: {:?}", err);
-            }
-        }
     }
+}
 
-    pub fn serialize(&self) -> JsValue {
+#[wasm_bindgen]
-        JsValue::from_serde(&self.0).map_err(|err| {
+impl FullTileRef {
-            err!("Error while serializing Signal: {:?}", err);
-        }).unwrap_or(JsValue::NULL)
-    }
 
-    pub fn push(&mut self, value: JsValue) {
-        if let Some(num) = value.as_f64() {
-            self.0.push(Value::Number(num));
-        } else if let Some(string) = value.as_string() {
-            self.0.push(Value::String(string));
-        } else {
-            panic!("Invalid value: expected number or string, got {:?}", value);
-        }
-    }
 }

stackline/src/world.rs

@@ -73,6 +73,22 @@ impl World {
 
     // TODO: get_pane_at, get_pane_at_mut
 
+    pub fn get_pane_at(&self, (x, y): (i32, i32)) -> Option<(&String, &Pane, usize, usize)> {
+        for (name, pane) in &self.panes {
+            let x2 = x - pane.position().0;
+            let y2 = y - pane.position().1;
+            if x2 >= 0
+                && x2 < pane.width().get() as i32
+                && y2 >= 0
+                && y2 < pane.height().get() as i32
+            {
+                return Some((name, pane, x2 as usize, y2 as usize));
+            }
+        }
+
+        None
+    }
+
     pub fn get(&self, (x, y): (i32, i32)) -> Option<VecRef<'_, FullTile>> {
         for pane in self.panes.values() {
             let x2 = x - pane.position().0;