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/target
**/*.rs.bk
Cargo.lock
bin/
pkg/
wasm-pack.log

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[package]
name = "wasm-game-of-life"
version = "0.1.0"
authors = ["fabian"]
edition = "2018"
[lib]
crate-type = ["cdylib", "rlib"]
[features]
default = ["console_error_panic_hook"]
[dependencies]
wasm-bindgen = "0.2.100"
# The `console_error_panic_hook` crate provides better debugging of panics by
# logging them with `console.error`. This is great for development, but requires
# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
# code size when deploying.
console_error_panic_hook = { version = "0.1.7", optional = true }
[dev-dependencies]
wasm-bindgen-test = "0.3.50"
[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"

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Copyright (c) 2018 fabian
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<div align="center">
<h1><code>wasm-pack-template</code></h1>
<strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
<p>
<a href="https://travis-ci.org/rustwasm/wasm-pack-template"><img src="https://img.shields.io/travis/rustwasm/wasm-pack-template.svg?style=flat-square" alt="Build Status" /></a>
</p>
<h3>
<a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
<span> | </span>
<a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
</h3>
<sub>Built with 🦀🕸 by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
</div>
## About
[**📚 Read this template tutorial! 📚**][template-docs]
This template is designed for compiling Rust libraries into WebAssembly and
publishing the resulting package to NPM.
Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
templates and usages of `wasm-pack`.
[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
## 🚴 Usage
### 🐑 Use `cargo generate` to Clone this Template
[Learn more about `cargo generate` here.](https://github.com/ashleygwilliams/cargo-generate)
```
cargo generate --git https://github.com/rustwasm/wasm-pack-template.git --name my-project
cd my-project
```
### 🛠️ Build with `wasm-pack build`
```
wasm-pack build
```
### 🔬 Test in Headless Browsers with `wasm-pack test`
```
wasm-pack test --headless --firefox
```
### 🎁 Publish to NPM with `wasm-pack publish`
```
wasm-pack publish
```
## 🔋 Batteries Included
* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
between WebAssembly and JavaScript.
* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
for logging panic messages to the developer console.
* `LICENSE-APACHE` and `LICENSE-MIT`: most Rust projects are licensed this way, so these are included for you
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.

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build:
wasm-pack build && cd www && pnpm i
run:
cd www && pnpm run start

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mod utils;
use std::fmt;
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
extern "C" {
fn alert(s: &str);
}
#[wasm_bindgen]
pub fn greet(s: &str) {
alert(&format!("Hello, {}!", s));
}
#[wasm_bindgen]
#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Cell {
Dead = 0,
Alive = 1,
}
#[wasm_bindgen]
pub struct Universe {
width: u32,
height: u32,
cells: Vec<Cell>,
}
impl Universe {
fn get_index(&self, row: u32, column: u32) -> usize {
(row * self.width + column) as usize
}
fn live_neighbor_count(&self, row: u32, column: u32) -> u8 {
let mut count = 0;
for delta_row in [self.height - 1, 0, 1].iter().cloned() {
for delta_col in [self.width - 1, 0, 1].iter().cloned() {
if delta_row == 0 && delta_col == 0 {
continue;
}
let neighbor_row = (row + delta_row) % self.height;
let neighbor_col = (column + delta_col) % self.width;
let idx = self.get_index(neighbor_row, neighbor_col);
count += self.cells[idx] as u8;
}
}
count
}
}
#[wasm_bindgen]
impl Universe {
pub fn tick(&mut self) {
let mut next = self.cells.clone();
for row in 0..self.height {
for col in 0..self.width {
let idx = self.get_index(row, col);
let cell = self.cells[idx];
let live_neighbors = self.live_neighbor_count(row, col);
let next_cell = match (cell, live_neighbors) {
// Rule 1: Any live cell with fewer than two live neighbours
// dies, as if caused by underpopulation.
(Cell::Alive, x) if x < 2 => Cell::Dead,
// Rule 2: Any live cell with two or three live neighbours
// lives on to the next generation.
(Cell::Alive, 2) | (Cell::Alive, 3) => Cell::Alive,
// Rule 3: Any live cell with more than three live
// neighbours dies, as if by overpopulation.
(Cell::Alive, x) if x > 3 => Cell::Dead,
// Rule 4: Any dead cell with exactly three live neighbours
// becomes a live cell, as if by reproduction.
(Cell::Dead, 3) => Cell::Alive,
// All other cells remain in the same state.
(otherwise, _) => otherwise,
};
next[idx] = next_cell;
}
}
self.cells = next;
}
pub fn new() -> Universe {
let width = 64;
let height = 64;
let cells = (0..width * height)
.map(|i| {
if i % 2 == 0 || i % 7 == 0 {
Cell::Alive
} else {
Cell::Dead
}
})
.collect();
Universe {
width,
height,
cells,
}
}
pub fn render(&self) -> String {
self.to_string()
}
}
impl Default for Universe {
fn default() -> Self {
Self::new()
}
}
impl fmt::Display for Universe {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for line in self.cells.as_slice().chunks(self.width as usize) {
for &cell in line {
let symbol = if cell == Cell::Dead { '◻' } else { '◼' };
write!(f, "{}", symbol)?;
}
writeln!(f)?;
}
Ok(())
}
}

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pub fn set_panic_hook() {
// When the `console_error_panic_hook` feature is enabled, we can call the
// `set_panic_hook` function at least once during initialization, and then
// we will get better error messages if our code ever panics.
//
// For more details see
// https://github.com/rustwasm/console_error_panic_hook#readme
#[cfg(feature = "console_error_panic_hook")]
console_error_panic_hook::set_once();
}

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Subproject commit 8d3f892b72bd55c0bc03f4f3b8c5731cff6724f1