✨ WIP wasm API

stackline-cli/Cargo.toml

@@ -7,5 +7,5 @@ description = "A simple runner and editor for Stackline 2"
 
 [dependencies]
 clap = { version = "3.2", features = ["derive"] }
-stackline = { path = "../stackline" }
+stackline = { path = "../stackline", features = ["time"] }
 serde_json = "1.0"

stackline-wasm/Cargo.toml

@@ -11,8 +11,11 @@ crate-type = ["cdylib", "rlib"]
 default = ["console_error_panic_hook"]
 
 [dependencies]
-wasm-bindgen = "0.2.63"
+wasm-bindgen = { version = "0.2.63", features = ["serde-serialize"] }
-stackline = { path = "../stackline" }
+serde_json = "1.0"
+serde = { version = "1", features = ["derive"] }
+
+stackline = { path = "../stackline", features = [], default-features = false }
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
@@ -27,5 +30,8 @@ console_error_panic_hook = { version = "0.1.6", optional = true }
 # Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
 wee_alloc = { version = "0.4.5", optional = true }
 
+web-sys = { version = "0.3", features = ["console"] }
+js-sys = "0.3"
+
 [dev-dependencies]
 wasm-bindgen-test = "0.3.13"

stackline-wasm/README.md

@@ -1,3 +1,9 @@
 # stackline-wasm
 
 WASM bindings for stackline.
+
+To build, run
+
+```sh
+wasm-pack build stackline-wasm --target web
+```

stackline-wasm/src/lib.rs

@@ -1,6 +1,16 @@
 mod utils;
 
+use serde::{Deserialize, Serialize};
 use wasm_bindgen::prelude::*;
+use js_sys::Function;
+
+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;
 
 // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
 // allocator.
@@ -14,6 +24,247 @@ extern "C" {
 }
 
 #[wasm_bindgen]
-pub fn greet() {
+pub struct World(SLWorld);
-    alert("Hello, stackline2-wasm!");
+
+#[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
+    pub fn new() -> Self {
+        Self(SLWorld::new())
+    }
+
+    /// Initializes the World, making it ready to run
+    pub fn init(&mut self) {
+        self.0.init();
+    }
+
+    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.clone();
+        }
+    }
+
+    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);
+    }
+}
+
+#[wasm_bindgen]
+pub struct Pane(SLPane);
+
+#[wasm_bindgen]
+impl Pane {
+    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(getter)]
+    pub fn height(&self) -> usize {
+        self.0.height().get()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn position(&self) -> Vec<i32> {
+        let (x, y) = self.0.position();
+        vec![x, y]
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_position(&mut self, position: &[i32]) {
+        if let [x, y] = position[..] {
+            self.0.set_position((x, y));
+        }
+    }
+}
+
+#[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))))
+    }
+
+    #[allow(non_snake_case)]
+    pub fn toString(&self) -> String {
+        format!("{:#?}", self.0)
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn signal(&self) -> Option<Signal> {
+        self.0.signal().map(|signal| Signal(signal.clone()))
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_signal(&mut self, signal: Option<Signal>) {
+        self.0.set_signal(signal.map(|s| s.0));
+    }
+
+    #[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),
+            }
+        }
+    }
+
+    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()
+                .map(<UntaggedValue as From<&'_ Value>>::from)
+                .collect::<Vec<_>>(),
+        )
+        .unwrap()
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn direction(&self) -> u8 {
+        match self.0.direction() {
+            Direction::Up => 0,
+            Direction::Right => 1,
+            Direction::Down => 2,
+            Direction::Left => 3,
+        }
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_direction(&mut self, direction: u8) {
+        let direction = match direction {
+            0 => Direction::Up,
+            1 => Direction::Right,
+            2 => Direction::Down,
+            3 => Direction::Left,
+            _ => return,
+        };
+
+        self.0.set_direction(direction);
+    }
+
+    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/utils.rs

@@ -8,3 +8,19 @@ pub fn set_panic_hook() {
     #[cfg(feature = "console_error_panic_hook")]
     console_error_panic_hook::set_once();
 }
+
+// A macro to provide `println!(..)`-style syntax for `console.log` logging.
+#[macro_export]
+macro_rules! log {
+    ( $( $t:tt )* ) => {
+        web_sys::console::log_1(&format!( $( $t )* ).into())
+    }
+}
+
+// A macro to provide `println!(..)`-style syntax for `console.error` logging.
+#[macro_export]
+macro_rules! err {
+    ( $( $t:tt )* ) => {
+        web_sys::console::error_1(&format!( $( $t )* ).into())
+    }
+}

stackline/Cargo.toml

@@ -5,6 +5,9 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+time = []
+
 [dependencies]
 palette = "0.6"
 enum_dispatch = "0.3"

stackline/build.rs

@@ -142,7 +142,23 @@ fn generate_code(files: Vec<(PathBuf, Vec<String>)>, names: Vec<String>) -> Stri
     }
 
     res += "            _ => None\n";
-    res += "        }\n    }\n}\n";
+    res += "        }\n    }\n";
+
+    writeln!(
+        res,
+        "    pub fn available() -> [&'static str; {}] {{\n        [",
+        names.len()
+    ).unwrap();
+    for name in names.iter() {
+        writeln!(
+            res,
+            "            \"{}\",",
+            name
+        )
+        .unwrap();
+    }
+    res += "        ]\n";
+    res += "    }\n}\n\n";
 
     for name in names {
         // impl<T: Tile> TryInto<&T> for &AnyTile

stackline/src/pane.rs

@@ -3,6 +3,7 @@ use serde::{Deserialize, Serialize};
 use veccell::{VecCell, VecRef, VecRefMut};
 
 #[derive(Debug, Serialize, Deserialize)]
+#[derive(Clone)]
 pub struct Pane {
     tiles: VecCell<FullTile>,
     width: NonZeroUsize,

stackline/src/signal.rs

@@ -140,6 +140,10 @@ impl Signal {
         self.direction
     }
 
+    pub fn set_direction(&mut self, direction: Direction) {
+        self.direction = direction;
+    }
+
     /// Pushes a value onto the stack of the signal.
     /// Signals are pushed on top of the stack and can be [`pop`ped](Signal::pop) in reverse order.
     ///

stackline/src/tile/full.rs

@@ -64,6 +64,15 @@ impl FullTile {
         self.cell.as_mut()
     }
 
+    #[inline]
+    pub fn set(&mut self, tile: Option<AnyTile>) {
+        if tile.is_none() {
+            self.signal = None;
+            self.state = State::Idle;
+        }
+        self.cell = tile;
+    }
+
     /// Returns the signal of this tile
     #[inline]
     pub fn signal(&self) -> Option<&Signal> {

stackline/src/world.rs

@@ -1,16 +1,25 @@
 use super::*;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use std::time::{Duration, Instant};
+use std::time::Duration;
 use veccell::VecRef;
 
+#[cfg(feature = "time")]
+use std::time::Instant;
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct World {
     panes: HashMap<String, Pane>,
 
     #[serde(default = "Instant::now")]
     #[serde(skip)]
+    #[cfg(feature = "time")]
     blink_start: Instant,
+
+    #[serde(skip)]
+    #[cfg(not(feature = "time"))]
+    blink_duration: Duration,
+
     #[serde(default)]
     blink_speed: Duration,
 }
@@ -20,7 +29,12 @@ impl World {
         Self {
             panes: HashMap::new(),
 
+            #[cfg(feature = "time")]
             blink_start: Instant::now(),
+
+            #[cfg(not(feature = "time"))]
+            blink_duration: Duration::default(),
+
             blink_speed: Duration::default(),
         }
     }
@@ -200,7 +214,7 @@ impl World {
     }
 
     pub fn draw(&self, dx: i32, dy: i32, surface: &mut TextSurface) {
-        let blink = Blink::new(Instant::now() - self.blink_start, self.blink_speed);
+        let blink = self.blink();
         for pane in self.panes.values() {
             pane.draw(dx, dy, surface, blink.clone());
         }
@@ -224,6 +238,21 @@ impl World {
     pub fn set_blink(&mut self, blink_speed: Duration) {
         self.blink_speed = blink_speed;
     }
+
+    #[cfg(not(feature = "time"))]
+    pub fn set_blink_duration(&mut self, blink_duration: Duration) {
+        self.blink_duration = blink_duration;
+    }
+
+    #[cfg(feature = "time")]
+    fn blink(&self) -> Blink {
+        Blink::new(Instant::now() - self.blink_start, self.blink_speed)
+    }
+
+    #[cfg(not(feature = "time"))]
+    fn blink(&self) -> Blink {
+        Blink::new(self.blink_duration, self.blink_speed)
+    }
 }
 
 impl std::fmt::Display for World {
@@ -233,7 +262,7 @@ impl std::fmt::Display for World {
         let height = (bounds.3 - bounds.2) as usize;
 
         let mut surface = TextSurface::new(width, height);
-        let blink = Blink::new(Instant::now() - self.blink_start, self.blink_speed);
+        let blink = self.blink();
 
         for pane in self.panes.values() {
             pane.draw(bounds.0, bounds.2, &mut surface, blink.clone());