First commit

Cargo.lock

@@ -0,0 +1,141 @@
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+# It is not intended for manual editing.
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Cargo.toml

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+[package]
+authors = ["Mossfet"]
+description = "A small, optionally zero-dependency Conway's Game of Life library"
+edition = "2021"
+license = "GPL-3.0-or-later"
+name = "mossfets-game-of-life"
+readme = "README.md"
+repository = "https://git.solarpunk.moe/game-of-life"
+version = "0.7.0"
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rustc-hash = { version = "1.1.0", optional = true }
+rayon = { version = "1.6.0", optional = true }
+[profile.test]
+debug = true
+[features]
+default = ["advanced_threading", "advanced_hashing"]
+advanced_threading = ["dep:rayon"]
+advanced_hashing = ["dep:rustc-hash"]

README.md

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+# game-of-life
+
+A Rust implementation of Conway's Game of Life. Used as the basis for the GNOME app Mossfet's Life, but should be usable cross-platform

src/game.rs

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+#[cfg(not(feature = "advanced_threading"))]
+use std::thread;
+#[cfg(feature = "advanced_threading")]
+use rayon::prelude::*;
+
+#[cfg(feature = "advanced_hashing")]
+type Board = rustc_hash::FxHashSet<Coord>;
+#[cfg(not(feature = "advanced_hashing"))]
+type Board = std::collections::HashSet<Coord>;
+
+pub type Coord = (isize, isize);
+
+/// An error in the game's logic
+#[derive(Debug)]
+pub enum GameError {
+    NoPreviousTurn
+}
+
+/// A representation of the game's state. 
+#[derive(Default)]
+pub struct Game {
+    primary_board: Board,
+    initial_state: Board,
+    count: usize,
+    #[cfg(not(feature = "advanced_threading"))]
+    parallelism: usize,
+}
+
+impl Game {
+    /// Constructs a new board with all dead cells 
+    pub fn new() -> Self {
+        Self {
+            primary_board: Board::default(),
+            initial_state: Board::default(),
+            count: 0,
+            #[cfg(not(feature = "advanced_threading"))]
+            parallelism: std::thread::available_parallelism().unwrap().into(),
+        }
+    }
+
+    /// Returns whether the cell at the given coordinate is alive
+    pub fn get_state(&self, coord: Coord) -> bool {
+        self.primary_board.contains(&coord)
+    }
+
+    /// Gets all live cells on the board
+    pub fn cells(&self) -> Vec<Coord> {
+        self.primary_board.iter().cloned().collect()
+    }
+
+    /// Flips the cell at the given coordinate betweeen alive and dead. Will return whether the new
+    /// cell is alive
+    pub fn flip_state(&mut self, coord: Coord) -> bool {
+        self.count = 0;
+        if self.primary_board.contains(&coord) {
+            self.primary_board.remove(&coord);
+            self.initial_state = self.primary_board.clone();
+            false
+        } else {
+            self.primary_board.insert(coord);
+            self.initial_state = self.primary_board.clone();
+            true
+        }
+    }
+
+    /// Advances the board by one turn
+    pub fn advance_board(&mut self) {
+        // Get all the cells to check
+        let mut check_set = Board::default();
+        for (x, y) in &self.primary_board {
+            let x = x.clone();
+            let y = y.clone();
+            check_set.insert((x, y));
+            check_set.insert((x, y+1));
+            check_set.insert((x, y-1));
+            check_set.insert((x+1, y));
+            check_set.insert((x+1, y+1));
+            check_set.insert((x+1, y-1));
+            check_set.insert((x-1, y));
+            check_set.insert((x-1, y+1));
+            check_set.insert((x-1, y-1));
+        }
+
+        // Iterate through the cells and modify the other HashSet
+        //let old_board = std::mem::take(&mut self.secondary_board);
+        let mut new_board = Board::default();
+        #[cfg(not(feature = "advanced_threading"))]
+        {
+            let binding = check_set.iter().collect::<Vec<&Coord>>();
+            let chunks = binding.chunks((binding.len()/self.parallelism)+1);
+            thread::scope(|s| {
+                let mut handles = vec![];
+                for chunk in chunks {
+                    let handle = s.spawn(|| {
+                        let owned_chunk = chunk.iter().map(|x| x.to_owned().to_owned());
+                        let mut return_set = Board::default();
+                        for coord in owned_chunk {
+                            if get_next_state(&self.primary_board, coord) {
+                                return_set.insert(coord);
+                            }
+                        }
+                        return_set
+                    });
+                    handles.push(handle);
+                }
+                for handle in handles {
+                    new_board.extend(handle.join().unwrap());
+                }
+            });
+        }
+
+        #[cfg(feature = "advanced_threading")]
+        {
+            new_board.par_extend(check_set.par_iter().filter(|coord| get_next_state(&self.primary_board, coord.to_owned().to_owned())));
+        }
+
+        // Swap the HashSets
+        self.primary_board = new_board;
+        self.count += 1;
+    }
+
+
+
+    /// Returns a vector of the values between the given top-left and bottom-right
+    /// coordinate
+    pub fn get_view(&self, coord1: Coord, coord2: Coord) -> Vec<&Coord>{
+        self.primary_board.iter()
+            .filter(|(x, y)| x >= &coord1.0 && y >= &coord1.1 && x <= &coord2.0 && y <= &coord2.1)
+            .collect()
+
+    }
+
+    /// Sets the board to its previous state. The board's history will only go back to the last
+    /// manual intervention done by a player (such as loading a file or toggling a cell). Returns
+    /// true if it reverted, and false if there was no previous revert. 
+    pub fn revert_board(&mut self) -> bool {
+        // Check if there have been any turns since the initial state
+        if self.count == 0 {
+            return false;
+        }
+        self.primary_board = self.initial_state.clone();
+        // Check if we can simply swap out the old board. 
+        /*if self.easy_buffer_revert {
+          std::mem::swap(&mut self.primary_board, &mut self.secondary_board);
+          self.easy_buffer_revert = false;
+          return;
+          }*/
+        let count = self.count;
+        for _ in 0..count-1 {
+            self.advance_board();
+        }
+        // let set = self.into_iter().nth(count).unwrap();
+        //self.primary_board = set;
+        self.count = count - 1;
+        true
+    }
+}
+
+impl Iterator for Game {
+    type Item = Board;
+    fn next(&mut self) -> Option<Self::Item> {
+        self.advance_board();
+        Some(self.primary_board.clone())
+    }
+}
+
+/// Given a board and a coordinate, return whether the cell at that coordinate should be live next
+/// round
+fn get_next_state(board: &Board, coord: Coord) -> bool {
+    let current_state = board.contains(&coord);
+    let (x, y) = coord;
+    let mut count: u8 = 0;
+    for coord in [(x, y+1), (x, y-1), (x+1, y), (x+1, y+1), (x+1, y-1), (x-1, y), (x-1, y+1), (x-1, y-1)] {
+        if board.contains(&coord) {
+            count += 1;
+        }
+    }
+    if current_state {
+        (2 <= count) && (count <= 3)
+    } else {
+        count == 3
+    }
+}

src/lib.rs

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+//! A library implemting the logic for Conway's Game of Life
+//! It can be embedded into applications, and can read the Plaintext and Life 1.05 file formats. 
+#![feature(test)]
+extern crate test;
+
+pub mod game;
+pub mod reader;
+pub mod writer;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use test::Bencher;
+    #[bench]
+    fn test_spacefiller_perf (b: &mut Bencher) {
+        let mut game = reader::read_game_at_path("tests/cells/spacefiller.cells").unwrap();
+        b.iter(|| game.advance_board());
+    }
+}

src/reader.rs

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+use std::{path::Path, fs::File, io::{self, BufRead, Read}};
+use crate::game::Game;
+
+/// An error when reading the file
+#[derive(Debug)]
+pub enum ReaderError {
+    FileAccessError,
+    ParseError,
+}
+
+
+/// Read the file at a given path. If all goes well, will return `Ok(game)`, with a game
+/// initialised with that pattern. Can return errors for either file access or failed parsing. 
+pub fn read_game_at_path(path: &str) -> Result<Game, ReaderError> {
+    let path = Path::new(path);
+    let file = open_file(path)?;
+    read_game(file)
+}
+
+/// Read from any `impl Read`. If all goes well, will return `Ok<Game>` with a game 
+/// initialised with that pattern. Can return errors for failed parsing. 
+pub fn read_game(file: impl Read) -> Result<Game, ReaderError> {
+    let lines = io::BufReader::new(file).lines();
+    let mut game = Game::new();
+    let mut x_index = 0;
+    for line in lines {
+        if let Ok(ip) = line {
+            // Comment/metadata
+            if ip.starts_with("!") || ip.starts_with("#") {continue}
+            x_index += 1;
+            for (cell, y_index) in ip.chars().zip(0..) {
+                match cell {
+                    // Live cell
+                    '*' | 'O' => {game.flip_state((y_index, x_index));},
+                    // Dead cell
+                    '.' | ' ' => continue,
+                    // Invalid character
+                    _ => {return Err(ReaderError::ParseError);},
+                }
+                /*if cell == '*' || cell == 'O' {
+                    // Live cell
+                    game.flip_state((y_index, x_index));
+                } else if cell == '.' || cell == ' ' {
+                    // Dead cell
+                    continue
+                } else {
+                    // Invalid character
+                    return Err(ReaderError::ParseError);
+                }*/
+            }
+        }
+    }
+    Ok(game)
+}
+
+
+fn open_file(path: &Path) -> Result<File, ReaderError> {
+    match File::open(path) {
+        Ok(file) => Ok(file),
+        Err(_) => Err(ReaderError::FileAccessError),
+    }
+}

src/writer.rs

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+use std::path::{Path, PathBuf};
+use std::fs::File;
+use std::collections::{HashMap, BinaryHeap};
+use std::cmp::Reverse;
+use std::io::Write;
+
+use crate::game::{Game, Coord};
+
+/// An error when writing to a file
+#[derive(Debug)]
+pub enum WriterError {
+    FileAccessError,
+    WriteError,
+}
+
+
+/// Write the given game to the file at the given path. 
+pub fn write_game_at_path(path: PathBuf, game: &Game) -> Result<(), WriterError> {
+    let mut file = create_file(path.as_path())?;
+    write_game(&mut file, game)
+}
+
+/// Write the given game to the writer. Currently only accept `std::io::Write` implementors. 
+pub fn write_game(writer: &mut impl Write, game: &Game) -> Result<(), WriterError> {
+    //let path = Path::new(path);
+    let mut string = String::new();
+    let mut values = CellRows::new();
+    for i in game.cells() {
+        values.insert(i);
+    }
+    for y in values.smallest_y..values.greatest_y+1 {
+        if let Some(row) = values.rows.get_mut(&y) {
+            for x in values.smallest_x..values.greatest_x+1 {
+                if let Some(ch) = row.peek() {
+                    if ch.0 == x {
+                        string.push_str("*");
+                        row.pop();
+                    } else {
+                        string.push_str(".");
+                    }
+                } else {
+                    string.push_str(".");
+                }
+            }
+        }
+        string.push_str("\n");
+    }
+    match write!(writer, "{}", string) {
+        Ok(_) => Ok(()),
+        Err(_) => Err(WriterError::WriteError),
+    }
+}
+
+fn create_file(path: &Path) -> Result<File, WriterError> {
+    match File::create(path) {
+        Ok(file) => Ok(file),
+        Err(_) => Err(WriterError::FileAccessError),
+    }
+}
+
+#[derive(Default)]
+struct CellRows {
+    rows: HashMap<isize, BinaryHeap<Reverse<isize>>>,
+    smallest_x: isize,
+    greatest_x: isize,
+    smallest_y: isize,
+    greatest_y: isize,
+    smallest_x_set: bool,
+    smallest_y_set: bool,
+    greatest_x_set: bool,
+    greatest_y_set: bool,
+}
+
+impl CellRows {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn insert(&mut self, (x, y): Coord) {
+        if x < self.smallest_x || !self.smallest_x_set { self.smallest_x = x; self.smallest_x_set = true };
+        if y < self.smallest_y || !self.smallest_y_set { self.smallest_y = y; self.smallest_y_set = true };
+        if x > self.greatest_x || !self.greatest_x_set { self.greatest_x = x; self.greatest_x_set = true };
+        if y > self.greatest_y || !self.greatest_y_set { self.greatest_y = y; self.greatest_y_set = true };
+        self.rows.entry(y).and_modify(|heap| {heap.push(Reverse(x))}).or_insert({let mut heap = BinaryHeap::new(); heap.push(Reverse(x)); heap});
+    }
+}

target/.rustc_info.json

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target/CACHEDIR.TAG

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target/debug/.fingerprint/rayon-core-c912384fbeb5ddaa/build-script-build-script-build

@@ -0,0 +1 @@
+588dc1f8a94031ef

target/debug/.fingerprint/rayon-core-c912384fbeb5ddaa/build-script-build-script-build.json

@@ -0,0 +1 @@
+{"rustc":4936231744503104448,"features":"[]","target":427768481117760528,"profile":12637318739757120569,"path":7589689886644562382,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/rayon-core-c912384fbeb5ddaa/dep-build-script-build-script-build"}}],"rustflags":[],"metadata":14590378261418540923,"config":2202906307356721367,"compile_kind":0}

target/debug/.fingerprint/rayon-core-c912384fbeb5ddaa/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.