.

packages/demo/demo.rust.ts

@@ -5,10 +5,22 @@ import { grid } from "./sample";
 (async () => {
 	const api = await import("@snk/solver-r");
 
-	const g = api.Grid.create(grid.width, grid.height, grid.data);
+	const g = api.IGrid.create(grid.width, grid.height, grid.data);
 
-	const { canvas, draw, highlightCell } = createCanvas(g);
-	document.body.appendChild(canvas);
+	const freeCells = api.iget_free_cell(g);
 
-	draw({ width: g.width, height: g.height, data: g.cells }, [] as any, []);
+	console.log(freeCells);
+
+	{
+		const { canvas, draw, highlightCell } = createCanvas(g);
+		document.body.appendChild(canvas);
+
+		draw({ width: g.width, height: g.height, data: g.data }, [] as any, []);
+
+		for (let i = freeCells.length / 2; i--; ) {
+			const x = freeCells[i * 2 + 0];
+			const y = freeCells[i * 2 + 1];
+			highlightCell(x, y);
+		}
+	}
 })();

packages/solver-r/src/grid.rs

@@ -0,0 +1,63 @@
+#[derive(Copy, Clone, Hash, Eq, PartialEq, Debug)]
+pub struct Point {
+    pub x: u8,
+    pub y: u8,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+#[repr(u8)]
+pub enum Cell {
+    Empty = 0,
+    Color1 = 1,
+    Color2 = 2,
+    Color3 = 3,
+    Color4 = 4,
+}
+
+#[derive(Clone)]
+pub struct Grid {
+    pub width: u8,
+    pub height: u8,
+    pub cells: Vec<Cell>,
+}
+impl Grid {
+    pub fn create_empty(width: u8, height: u8) -> Grid {
+        let n = (width as usize) * (height as usize);
+        let cells = (0..n).map(|_| Cell::Empty).collect();
+
+        Grid {
+            width,
+            height,
+            cells,
+        }
+    }
+
+    pub fn get_index(&self, x: u8, y: u8) -> usize {
+        return (x as usize) * (self.height as usize) + (y as usize);
+    }
+    pub fn get_cell(&self, p: &Point) -> Cell {
+        let i = self.get_index(p.x, p.y);
+        return self.cells[i];
+    }
+    pub fn set_cell(&mut self, p: &Point, value: Cell) -> () {
+        let i = self.get_index(p.x, p.y);
+        self.cells[i] = value;
+    }
+}
+
+#[test]
+fn it_should_grid_create() {
+    let grid = Grid::create_empty(30, 10);
+
+    assert_eq!(grid.width, 30);
+    assert_eq!(grid.height, 10);
+    assert_eq!(grid.get_cell(&Point { x: 2, y: 3 }), Cell::Empty);
+}
+#[test]
+fn it_should_grid_setter() {
+    let mut grid = Grid::create_empty(20, 10);
+
+    grid.set_cell(&Point { x: 12, y: 3 }, Cell::Color1);
+
+    assert_eq!(grid.get_cell(&Point { x: 12, y: 3 }), Cell::Color1);
+}

packages/solver-r/src/lib.rs

@@ -1,4 +1,9 @@
+mod grid;
+mod solver;
+
+use grid::{Cell, Grid};
 use js_sys;
+use solver::get_free_cell;
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]
@@ -11,45 +16,17 @@ pub fn greet() {
     alert("Hello, wasm-game-of-life!");
 }
 
-#[derive(Copy, Clone)]
-pub struct Point {
-    x: i8,
-    y: i8,
-}
-
-#[wasm_bindgen]
-#[derive(Copy, Clone, Debug, PartialEq)]
-#[repr(u8)]
-pub enum Cell {
-    Empty = 0,
-    Color1 = 1,
-    Color2 = 2,
-    Color3 = 3,
-    Color4 = 4,
-    Color5 = 5,
-}
-
 #[wasm_bindgen]
 #[derive(Clone)]
-pub struct Grid {
-    pub width: i8,
-    pub height: i8,
+pub struct IGrid {
+    pub width: u8,
+    pub height: u8,
     cells: Vec<Cell>,
 }
 
 #[wasm_bindgen]
-impl Grid {
-    pub fn create_empty(width: i8, height: i8) -> Grid {
-        let n = (width as usize) * (height as usize);
-        let cells = (0..n).map(|_| Cell::Empty).collect();
-
-        Grid {
-            width,
-            height,
-            cells,
-        }
-    }
-    pub fn create(width: i8, height: i8, data: js_sys::Uint8Array) -> Grid {
+impl IGrid {
+    pub fn create(width: u8, height: u8, data: js_sys::Uint8Array) -> IGrid {
         let cells = data
             .to_vec()
             .iter()
@@ -59,12 +36,11 @@ impl Grid {
                 2 => Cell::Color2,
                 3 => Cell::Color3,
                 4 => Cell::Color4,
-                5 => Cell::Color5,
                 _ => panic!("unknown cell"),
             })
             .collect();
 
-        Grid {
+        IGrid {
             width,
             height,
             cells,
@@ -72,40 +48,29 @@ impl Grid {
     }
 
     #[wasm_bindgen(getter)]
-    pub fn cells(&self) -> js_sys::Uint8Array {
+    pub fn data(&self) -> js_sys::Uint8Array {
         let o: Vec<u8> = self.cells.iter().map(|u| *u as u8).collect();
         js_sys::Uint8Array::from(&o[..])
     }
 }
 
-type Snake = [Point; 5];
-
-pub fn get_index(grid: &Grid, x: i8, y: i8) -> usize {
-    return (x as usize) * (grid.height as usize) + (y as usize);
+impl From<IGrid> for Grid {
+    fn from(value: IGrid) -> Self {
+        Self {
+            width: value.width,
+            height: value.height,
+            cells: value.cells,
+        }
+    }
 }
 
-pub fn get_cell(grid: &Grid, p: &Point) -> Cell {
-    let i = get_index(grid, p.x, p.y);
-    return grid.cells[i];
-}
-pub fn set_cell(grid: &mut Grid, p: &Point, value: Cell) -> () {
-    let i = get_index(&grid, p.x, p.y);
-    grid.cells[i] = value;
-}
+#[wasm_bindgen]
+pub fn iget_free_cell(grid: &IGrid) -> js_sys::Uint8Array {
+    let g = Grid::from(grid.clone());
 
-#[test]
-fn grid_create() {
-    let grid = Grid::create_empty(30, 10);
+    let out = get_free_cell(&g, Cell::Color1);
 
-    assert_eq!(grid.width, 30);
-    assert_eq!(grid.height, 10);
-    assert_eq!(get_cell(&grid, &Point { x: 2, y: 3 }), Cell::Empty);
-}
-#[test]
-fn grid_setter() {
-    let mut grid = Grid::create_empty(20, 10);
-
-    set_cell(&mut grid, &Point { x: 12, y: 3 }, Cell::Color1);
-
-    assert_eq!(get_cell(&grid, &Point { x: 12, y: 3 }), Cell::Color1);
+    let o: Vec<u8> = out.iter().flat_map(|p| [p.x, p.y]).collect();
+
+    js_sys::Uint8Array::from(&o[..])
 }

packages/solver-r/src/solver.rs

@@ -0,0 +1,34 @@
+use std::collections::HashSet;
+
+use crate::grid::{Cell, Grid, Point};
+
+pub fn get_free_cell(grid: &Grid, walkable: Cell) -> HashSet<Point> {
+    let mut free: HashSet<Point> = HashSet::new();
+    let mut open_list: HashSet<Point> = HashSet::new();
+    let mut changed = true;
+
+    open_list.insert(Point { x: 0, y: 0 });
+
+    while changed {
+        changed = false
+    }
+
+    open_list
+}
+
+#[test]
+fn it_should_collect_free_cell() {
+    let mut grid = Grid::create_empty(2, 2);
+
+    grid.set_cell(&Point { x: 1, y: 1 }, Cell::Color2);
+
+    let free_cells = get_free_cell(&grid, Cell::Color1);
+
+    assert_eq!(
+        free_cells,
+        HashSet::from([
+            //
+            Point { x: 0, y: 0 }
+        ])
+    );
+}