612 lines
21 KiB
Rust
612 lines
21 KiB
Rust
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use crate::{Color, Size};
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use grid::Grid;
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use std::collections::HashSet;
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#[derive(Clone, Debug)]
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pub enum Error {
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InvalidPosition,
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}
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#[derive(Clone, Debug)]
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pub struct Board {
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pub size: Size,
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pub grid: Grid<Option<Color>>,
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pub groups: Vec<Group>,
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}
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impl std::fmt::Display for Board {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
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print!(" ");
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// for c in 'A'..'U' {
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for c in 0..19 {
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print!("{:2}", c);
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}
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println!("");
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for row in 0..self.size.height {
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print!(" {:2}", row);
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for column in 0..self.size.width {
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match self.stone(&Coordinate { column, row }) {
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None => write!(f, " .")?,
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Some(Color::Black) => write!(f, " X")?,
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Some(Color::White) => write!(f, " O")?,
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}
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}
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writeln!(f, "")?;
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}
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Ok(())
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}
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}
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impl Board {
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pub fn new() -> Self {
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Self {
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size: Size {
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width: 19,
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height: 19,
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},
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grid: Grid::new(19, 19),
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groups: Vec::new(),
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}
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}
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pub fn from_coordinates(coordinates: impl Iterator<Item = (Coordinate, Color)>) -> Self {
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let mut s = Self::new();
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for (coordinate, color) in coordinates {
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s.place_stone(coordinate, color);
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}
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s
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}
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}
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#[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
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pub struct Coordinate {
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pub column: usize,
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pub row: usize,
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}
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impl Board {
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pub fn place_stone(&mut self, coordinate: Coordinate, color: Color) -> Result<(), Error> {
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if let Some(_) = self.stone(&coordinate) {
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return Err(Error::InvalidPosition);
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}
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let mut friendly_group = self
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.adjacencies(&coordinate)
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.into_iter()
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.filter(|c| self.stone(c) == Some(color))
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.filter_map(|c| self.group(&c).map(|g| g.coordinates.clone()))
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.fold(HashSet::new(), |acc, set| {
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acc.union(&set).cloned().collect()
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});
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friendly_group.insert(coordinate.clone());
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self.groups
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.retain(|g| g.coordinates.is_disjoint(&friendly_group));
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let friendly_group = Group {
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color,
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coordinates: friendly_group,
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};
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self.groups.push(friendly_group.clone());
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match self.grid.get_mut(coordinate.row, coordinate.column) {
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None => return Err(Error::InvalidPosition),
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Some(space) => *space = Some(color),
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}
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let adjacent_groups = self.adjacent_groups(&friendly_group);
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for group in adjacent_groups {
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if self.liberties(&group) == 0 {
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self.remove_group(&group);
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}
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}
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Ok(())
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}
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pub fn stone(&self, coordinate: &Coordinate) -> Option<Color> {
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match self.grid.get(coordinate.row, coordinate.column) {
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None => None,
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Some(val) => *val,
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}
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}
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pub fn group(&self, coordinate: &Coordinate) -> Option<&Group> {
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self.groups
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.iter()
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.find(|g| g.coordinates.contains(coordinate))
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}
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pub fn remove_group(&mut self, group: &Group) {
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self.groups.retain(|g| g != group);
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for coord in group.coordinates.iter() {
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match self.grid.get_mut(coord.row, coord.column) {
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None => (),
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Some(v) => *v = None,
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}
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}
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}
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pub fn adjacent_groups(&self, group: &Group) -> Vec<Group> {
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let adjacent_spaces = self.group_halo(group).into_iter();
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println!("adjacent spaces: {:?}", adjacent_spaces);
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let mut grps: Vec<Group> = Vec::new();
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adjacent_spaces.for_each(|coord| match self.group(&coord) {
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None => return,
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Some(adj) => {
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println!("group found: {:?}", adj.color);
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if group.color == adj.color {
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return;
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}
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if grps.iter().any(|g| g.coordinates.contains(&coord)) {
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return;
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}
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grps.push(adj.clone());
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}
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});
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grps
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}
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pub fn group_halo(&self, group: &Group) -> HashSet<Coordinate> {
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group
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.coordinates
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.iter()
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.map(|c| self.adjacencies(c))
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.flatten()
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.collect::<HashSet<Coordinate>>()
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}
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pub fn liberties(&self, group: &Group) -> usize {
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self.group_halo(group)
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.into_iter()
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.filter(|c| self.stone(&c) == None)
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.count()
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// let adjacencies: HashSet<Coordinate> = self.adjacencies(group.coordinates.iter()).collect();
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/*
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println!("adjacencies: {:?}", adjacencies);
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let opposing_spaces = adjacencies
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.iter()
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.filter(|coord| match self.grid.get(coord.row, coord.column) {
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None => true,
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Some(&None) => false,
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Some(&Some(c)) => c != group.color,
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})
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.cloned()
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.collect::<HashSet<Coordinate>>();
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println!("opposition: {:?}", opposing_spaces);
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adjacencies.len() - opposing_spaces.len()
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*/
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/*
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group
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.adjacencies(self.size.width as u8 - 1, self.size.height as u8 - 1)
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.into_iter()
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.filter(|coordinate| self.stone(*coordinate).is_none())
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.collect::<Vec<Coordinate>>()
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.len()
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*/
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}
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pub fn adjacencies(&self, coordinate: &Coordinate) -> Vec<Coordinate> {
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let mut v = Vec::new();
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if coordinate.column > 0 {
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v.push(Coordinate {
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column: coordinate.column - 1,
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row: coordinate.row,
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});
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}
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if coordinate.row > 0 {
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v.push(Coordinate {
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column: coordinate.column,
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row: coordinate.row - 1,
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});
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}
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v.push(Coordinate {
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column: coordinate.column + 1,
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row: coordinate.row,
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});
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v.push(Coordinate {
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column: coordinate.column,
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row: coordinate.row + 1,
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});
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v.into_iter().filter(|c| self.within_board(c)).collect()
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}
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/*
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pub fn adjacencies<'a>(
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&'a self,
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coordinates: impl Iterator<Item = &'a Coordinate> + 'a,
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) -> impl Iterator<Item = Coordinate> + 'a {
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coordinates
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.map(|coordinate| {
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let mut v = Vec::new();
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if coordinate.column > 0 {
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v.push(Coordinate {
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column: coordinate.column - 1,
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row: coordinate.row,
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});
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}
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if coordinate.row > 0 {
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v.push(Coordinate {
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column: coordinate.column,
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row: coordinate.row - 1,
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});
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}
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v.push(Coordinate {
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column: coordinate.column + 1,
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row: coordinate.row,
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});
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v.push(Coordinate {
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column: coordinate.column,
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row: coordinate.row + 1,
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});
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v
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})
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.flatten()
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.filter(|coordinate| self.within_board(coordinate))
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}
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*/
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pub fn within_board(&self, coordinate: &Coordinate) -> bool {
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coordinate.column < self.size.width && coordinate.row < self.size.height
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}
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}
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#[derive(Clone, Debug, PartialEq)]
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pub struct Group {
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color: Color,
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coordinates: HashSet<Coordinate>,
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}
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/*
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impl Group {
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pub fn adjacencies(&self, max_column: usize, max_row: usize) -> HashSet<Coordinate> {
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self.coordinates
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.iter()
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.map(|stone| stone.adjacencies(max_column, max_row))
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.flatten()
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.collect()
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}
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}
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*/
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#[cfg(test)]
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mod test {
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use super::*;
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/* Two players (Black and White) take turns and Black plays first
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* Stones are placed on the line intersections and not moved.
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* A stone with no liberties is removed from the board.
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* A group of stones of the same color share liberties.
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* A stone at the edge of the board has only three liberties.
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* A stone at the corner of the board has only two liberties.
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* A stone may not be placed in a suicidal position.
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* A stone placed in a suicidal position is legal if it captures other stones first.
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*/
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fn with_example_board(test: impl FnOnce(Board)) {
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let board = Board::from_coordinates(
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vec![
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(Coordinate { column: 3, row: 3 }, Color::White),
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(Coordinate { column: 3, row: 4 }, Color::White),
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/* */
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(Coordinate { column: 8, row: 3 }, Color::Black),
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(Coordinate { column: 9, row: 3 }, Color::Black),
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(Coordinate { column: 9, row: 4 }, Color::Black),
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/* */
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(Coordinate { column: 15, row: 3 }, Color::White),
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(Coordinate { column: 15, row: 4 }, Color::White),
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(Coordinate { column: 15, row: 5 }, Color::White),
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(Coordinate { column: 14, row: 4 }, Color::White),
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/* */
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(Coordinate { column: 3, row: 8 }, Color::White),
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(Coordinate { column: 3, row: 9 }, Color::White),
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(Coordinate { column: 4, row: 9 }, Color::White),
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(Coordinate { column: 3, row: 10 }, Color::Black),
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/* */
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(Coordinate { column: 0, row: 0 }, Color::White),
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(Coordinate { column: 1, row: 0 }, Color::White),
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(Coordinate { column: 0, row: 1 }, Color::White),
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/* */
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(Coordinate { column: 9, row: 9 }, Color::White),
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(Coordinate { column: 8, row: 9 }, Color::Black),
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(Coordinate { column: 9, row: 8 }, Color::Black),
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(Coordinate { column: 9, row: 10 }, Color::Black),
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/* */
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(Coordinate { column: 0, row: 17 }, Color::White),
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(Coordinate { column: 1, row: 18 }, Color::White),
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(Coordinate { column: 0, row: 18 }, Color::White),
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(Coordinate { column: 0, row: 16 }, Color::Black),
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(Coordinate { column: 1, row: 17 }, Color::Black),
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/* */
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(Coordinate { column: 4, row: 17 }, Color::Black),
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(Coordinate { column: 5, row: 17 }, Color::Black),
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(Coordinate { column: 6, row: 17 }, Color::Black),
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(Coordinate { column: 4, row: 18 }, Color::Black),
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(Coordinate { column: 6, row: 18 }, Color::Black),
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(Coordinate { column: 3, row: 17 }, Color::White),
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(Coordinate { column: 3, row: 18 }, Color::White),
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(Coordinate { column: 4, row: 16 }, Color::White),
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(Coordinate { column: 5, row: 16 }, Color::White),
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(Coordinate { column: 6, row: 16 }, Color::White),
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(Coordinate { column: 7, row: 17 }, Color::White),
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(Coordinate { column: 7, row: 18 }, Color::White),
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]
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.into_iter(),
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);
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test(board);
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}
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#[test]
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fn it_gets_adjacencies_for_coordinate() {
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let board = Board::new();
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for column in 0..19 {
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for row in 0..19 {
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for coordinate in board.adjacencies(&Coordinate { column, row }) {
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assert!(
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board.within_board(&coordinate),
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"{} {}: {:?}",
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column,
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row,
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coordinate
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);
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}
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}
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}
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}
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#[test]
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fn it_counts_individual_liberties() {
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let board = Board::from_coordinates(
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vec![
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(Coordinate { column: 3, row: 3 }, Color::White),
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(Coordinate { column: 0, row: 3 }, Color::White),
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(Coordinate { column: 0, row: 0 }, Color::White),
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(Coordinate { column: 18, row: 9 }, Color::Black),
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(
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Coordinate {
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column: 18,
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row: 18,
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},
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Color::Black,
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),
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]
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.into_iter(),
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);
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assert!(board.group(&Coordinate { column: 18, row: 3 }).is_none());
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assert_eq!(
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board
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.group(&Coordinate { column: 3, row: 3 })
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.map(|g| board.liberties(&g)),
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Some(4)
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);
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|
|
assert_eq!(
|
||
|
|
board
|
||
|
|
.group(&Coordinate { column: 0, row: 3 })
|
||
|
|
.map(|g| board.liberties(&g)),
|
||
|
|
Some(3)
|
||
|
|
);
|
||
|
|
assert_eq!(
|
||
|
|
board
|
||
|
|
.group(&Coordinate { column: 0, row: 0 })
|
||
|
|
.map(|g| board.liberties(&g)),
|
||
|
|
Some(2)
|
||
|
|
);
|
||
|
|
assert_eq!(
|
||
|
|
board
|
||
|
|
.group(&Coordinate { column: 18, row: 9 })
|
||
|
|
.map(|g| board.liberties(&g)),
|
||
|
|
Some(3)
|
||
|
|
);
|
||
|
|
assert_eq!(
|
||
|
|
board
|
||
|
|
.group(&Coordinate {
|
||
|
|
column: 18,
|
||
|
|
row: 18
|
||
|
|
})
|
||
|
|
.map(|g| board.liberties(&g)),
|
||
|
|
Some(2)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn stones_share_liberties() {
|
||
|
|
with_example_board(|board: Board| {
|
||
|
|
let test_cases = vec![
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 0, row: 0 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 0, row: 0 },
|
||
|
|
Coordinate { column: 1, row: 0 },
|
||
|
|
Coordinate { column: 0, row: 1 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(3),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 1, row: 0 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 0, row: 0 },
|
||
|
|
Coordinate { column: 1, row: 0 },
|
||
|
|
Coordinate { column: 0, row: 1 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(3),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 9, row: 9 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![Coordinate { column: 9, row: 9 }].into_iter().collect(),
|
||
|
|
}),
|
||
|
|
Some(1),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 3, row: 4 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 3, row: 3 },
|
||
|
|
Coordinate { column: 3, row: 4 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(6),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 9, row: 3 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::Black,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 8, row: 3 },
|
||
|
|
Coordinate { column: 9, row: 3 },
|
||
|
|
Coordinate { column: 9, row: 4 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(7),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 15, row: 4 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 15, row: 3 },
|
||
|
|
Coordinate { column: 15, row: 4 },
|
||
|
|
Coordinate { column: 15, row: 5 },
|
||
|
|
Coordinate { column: 14, row: 4 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(8),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 3, row: 9 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 3, row: 8 },
|
||
|
|
Coordinate { column: 3, row: 9 },
|
||
|
|
Coordinate { column: 4, row: 9 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(6),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 0, row: 18 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 0, row: 17 },
|
||
|
|
Coordinate { column: 0, row: 18 },
|
||
|
|
Coordinate { column: 1, row: 18 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(1),
|
||
|
|
),
|
||
|
|
(
|
||
|
|
board.clone(),
|
||
|
|
Coordinate { column: 0, row: 17 },
|
||
|
|
Some(Group {
|
||
|
|
color: Color::White,
|
||
|
|
coordinates: vec![
|
||
|
|
Coordinate { column: 0, row: 17 },
|
||
|
|
Coordinate { column: 0, row: 18 },
|
||
|
|
Coordinate { column: 1, row: 18 },
|
||
|
|
]
|
||
|
|
.into_iter()
|
||
|
|
.collect(),
|
||
|
|
}),
|
||
|
|
Some(1),
|
||
|
|
),
|
||
|
|
];
|
||
|
|
|
||
|
|
println!("{}", board);
|
||
|
|
for (board, coordinate, group, liberties) in test_cases {
|
||
|
|
assert_eq!(board.group(&coordinate), group.as_ref());
|
||
|
|
assert_eq!(
|
||
|
|
board.group(&coordinate).map(|g| board.liberties(&g)),
|
||
|
|
liberties,
|
||
|
|
"{:?}",
|
||
|
|
coordinate
|
||
|
|
);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn it_finds_adjacent_groups() {
|
||
|
|
with_example_board(|mut board| {
|
||
|
|
println!("{}", board);
|
||
|
|
let group = board
|
||
|
|
.group(&Coordinate { column: 0, row: 0 })
|
||
|
|
.cloned()
|
||
|
|
.unwrap();
|
||
|
|
assert_eq!(board.adjacent_groups(&group), Vec::new());
|
||
|
|
|
||
|
|
let group = board
|
||
|
|
.group(&Coordinate { column: 3, row: 10 })
|
||
|
|
.cloned()
|
||
|
|
.unwrap();
|
||
|
|
assert_eq!(board.adjacent_groups(&group).len(), 1);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn surrounding_a_group_removes_it() {
|
||
|
|
with_example_board(|mut board| {
|
||
|
|
board.place_stone(Coordinate { column: 10, row: 9 }, Color::Black);
|
||
|
|
assert!(board.stone(&Coordinate { column: 9, row: 9 }).is_none());
|
||
|
|
|
||
|
|
board.place_stone(Coordinate { column: 2, row: 18 }, Color::Black);
|
||
|
|
assert!(board.stone(&Coordinate { column: 0, row: 18 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 1, row: 18 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 0, row: 17 }).is_none());
|
||
|
|
assert!(board.group(&Coordinate { column: 0, row: 18 }).is_none());
|
||
|
|
|
||
|
|
board.place_stone(Coordinate { column: 5, row: 18 }, Color::White);
|
||
|
|
assert!(board.stone(&Coordinate { column: 4, row: 17 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 5, row: 17 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 6, row: 17 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 4, row: 18 }).is_none());
|
||
|
|
assert!(board.stone(&Coordinate { column: 6, row: 18 }).is_none());
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
fn suicide_is_forbidden() {
|
||
|
|
assert!(false);
|
||
|
|
}
|
||
|
|
|
||
|
|
fn captures_preceed_self_capture() {
|
||
|
|
assert!(false);
|
||
|
|
}
|
||
|
|
}
|