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|
use std::convert::TryFrom;
use rand::{ thread_rng, Rng, distributions::Uniform };
const HIDDEN_BIT: u8 = 1 << 7;
pub const FLAGGED_BIT: u8 = 1 << 6;
const CORRECT_BIT: u8 = 1 << 5; // grading for a rightly flagged mine
const MINE_VAL: u8 = !(HIDDEN_BIT | FLAGGED_BIT | CORRECT_BIT);
const NEIGH_OFFS: &[(isize,isize)] = &[
(-1,-1),(0,-1),(1,-1),
(-1, 0), (1, 0),
(-1, 1),(0, 1),(1, 1),
];
#[derive(PartialEq)]
pub enum Phase {
SafeFirstMove,
FirstMoveFail,
Run,
Die,
Win,
Leave,
}
pub struct Game {
pub phase: Phase,
pub board: Board,
pub mine_count: usize,
}
pub struct Board {
pub data: Vec<u8>,
pub width: usize,
pub height: usize,
pub hidden_tiles: usize,
}
#[derive(Debug)]
pub enum MoveType {
Reveal,
ToggleFlag,
}
#[derive(Debug)]
pub struct Move {
pub t: MoveType,
pub pos: (usize,usize),
}
pub struct MoveResult(pub Board, pub bool);
impl Game {
pub fn new(board: Board, mine_count: usize) -> Self {
let mut g = Game { phase: Phase::SafeFirstMove, board, mine_count };
g.board = g.board.spread_mines(mine_count);
g
}
pub fn act(mut self, m: Move) -> Self {
let lost_phase = | phase | {
match phase {
Phase::SafeFirstMove => Phase::FirstMoveFail,
Phase::Run => Phase::Die,
_ => unreachable!(),
}
};
match m.t {
MoveType::Reveal => {
let kaboom: bool;
self.board = {
let mr = self.board.reveal(m.pos);
kaboom = mr.1;
mr.0
};
if kaboom { self.phase = lost_phase(self.phase) }
if self.phase == Phase::SafeFirstMove { self.phase = Phase::Run }
},
MoveType::ToggleFlag => self.board = self.board.flag(m.pos).0,
};
if self.board.hidden_tiles == self.mine_count {
self.phase = Phase::Win;
}
if self.phase == Phase::FirstMoveFail {
self.board = Board::new(self.board.width, self.board.height);
self.mine_count -= 1;
self.board = self.board.spread_mines(self.mine_count);
self.phase = Phase::SafeFirstMove;
self = self.act(m);
}
self
}
}
impl Board {
pub fn new(w: usize, h: usize) -> Self {
Board {
data: [HIDDEN_BIT].repeat(w*h),
width: w,
height: h,
hidden_tiles: w*h,
}
}
pub fn spread_mines(mut self, count: usize) -> Self {
let mut rng = thread_rng();
let mut c = count;
let w = self.width;
let h = self.height;
while c > 0 {
let randpos: (usize, usize) = (rng.sample(Uniform::new(0,w-1)), rng.sample(Uniform::new(0,h-1)));
let o = self.pos_to_off(randpos);
if self.data[o] == MINE_VAL | HIDDEN_BIT { continue }
else {
self.data[o] |= MINE_VAL;
c -= 1;
for (nx,ny) in NEIGH_OFFS {
let x = randpos.0;
let y = randpos.1;
let nxc = usize::try_from(isize::try_from(x).unwrap() + nx);
let nyc = usize::try_from(isize::try_from(y).unwrap() + ny);
let _ = nxc.and_then(|nx: usize| { nyc.and_then(|ny: usize| {
if nx > w - 1 || ny > h - 1 { return usize::try_from(-1) };
let off = self.pos_to_off((nx,ny));
let c = &mut self.data[off];
if *c != HIDDEN_BIT | MINE_VAL {
*c += 1;
}
Ok(0)
})
});
}
}
}
self
}
pub fn pos_to_off(&self, pos: (usize, usize)) -> usize {
pos.0 + pos.1 * self.width
}
pub fn flood_reveal(&mut self, pos: (usize, usize)) {
if pos.0 > self.width || pos.1 > self.height { return; }
let off = self.pos_to_off(pos);
let c = &mut self.data[off];
if *c & HIDDEN_BIT > 0 {
*c &= !(HIDDEN_BIT | FLAGGED_BIT);
self.hidden_tiles -= 1;
if *c > 0 { return }
drop(c);
for (ox,oy) in NEIGH_OFFS {
let nxr = usize::try_from(isize::try_from(pos.0).unwrap() + ox);
let nyr = usize::try_from(isize::try_from(pos.1).unwrap() + oy);
let _ = nxr.and_then(|nx: usize| { nyr.and_then(|ny: usize| {
if nx > self.width - 1 || ny > self.height - 1 { return usize::try_from(-1) };
self.flood_reveal((nx, ny));
Ok(0)
})
});
}
}
}
pub fn reveal(mut self, pos: (usize, usize)) -> MoveResult {
if pos.0 > self.width - 1 || pos.1 > self.height - 1 { panic!("OOB reveal"); }
let off = self.pos_to_off(pos);
self.flood_reveal(pos);
let c = self.data[off];
MoveResult { 0: self, 1: (c & !(FLAGGED_BIT | CORRECT_BIT)) == MINE_VAL } // Kaboom
}
pub fn grade(mut self) -> Board {
for i in &mut self.data {
if *i == MINE_VAL | FLAGGED_BIT | HIDDEN_BIT {
*i |= CORRECT_BIT;
}
}
self
}
pub fn flag(mut self, pos: (usize, usize)) -> MoveResult {
let off = self.pos_to_off(pos);
self.data[off] ^= FLAGGED_BIT;
MoveResult { 0: self, 1: false }
}
pub fn render(&self, cursor: Option<(usize,usize)>) -> Vec<u8> {
const CYAN: &[u8] = &[27,b'[',b'3',b'6',b'm'];
const YELLOW: &[u8] = &[27,b'[',b'3',b'3',b'm'];
const GREEN: &[u8] = &[27,b'[',b'3',b'2',b'm'];
const RED: &[u8] = &[27,b'[',b'3',b'1',b'm'];
const FG: &[u8] = &[27,b'[',b'3',b'9',b'm'];
const ULINE: &[u8] = &[27,b'[',b'4',b'm'];
const REGULAR: &[u8] = &[27,b'[',b'0',b'm'];
let mut ret = vec![27];
let mut cur_clr = FG;
for y in 0..self.height {
ret.extend_from_slice(b"<br>");
for x in 0..self.width {
let c = &self.data[self.pos_to_off((x,y))];
let is_cursor = if let Some(cursor) = cursor { cursor.0 == x && cursor.1 == y } else { false };
if is_cursor { ret.extend_from_slice(ULINE); }
match *c {
0 => ret.push(b' '),
_ if *c <= 8 => { if cur_clr != FG { ret.extend_from_slice(FG); cur_clr = FG; } ret.push(b'0' + c); },
_ if (*c & CORRECT_BIT) > 0 => { if cur_clr != GREEN { ret.extend_from_slice(GREEN); cur_clr = GREEN; } ret.push(b'F') },
_ if (*c & FLAGGED_BIT) > 0 => { if cur_clr != YELLOW { ret.extend_from_slice(YELLOW); cur_clr = YELLOW; } ret.push(b'F'); },
_ if (*c & HIDDEN_BIT) > 0 => { if cur_clr != CYAN { ret.extend_from_slice(CYAN); cur_clr = CYAN; } ret.push(35); },
_ if *c == MINE_VAL => { if cur_clr != RED { ret.extend_from_slice(RED); cur_clr = RED; } ret.push(b'O'); },
_ => ret.push(b'?'),
}
if is_cursor { ret.extend_from_slice(REGULAR); ret.extend_from_slice(cur_clr); }
}
}
ret
}
}
|
