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|
use std::{ io, io::Read };
mod minesweeper {
use std::convert::TryFrom;
use std::fmt::Display;
use rand::{ thread_rng, Rng, distributions::Uniform };
const HIDDEN_BIT: u8 = 1 << 7;
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: &[(i8,i8)] = &[
(-1,-1),(0,-1),(1,-1),
(-1, 0), (1, 0),
(-1, 1),(0, 1),(1, 1),
];
pub struct Board {
pub data: Vec<u8>,
pub width: usize,
pub height: usize,
}
pub struct Move(pub Board, pub bool);
impl Board {
pub fn new(w: usize, h: usize, mine_count: usize) -> Board {
let mut b = Board {
data: [HIDDEN_BIT].repeat(w*h),
width: w,
height: h,
};
let mut rng = thread_rng();
let mut c = mine_count;
while c > 0 {
let x: usize = rng.sample(Uniform::new(0,w-1));
let y: usize = rng.sample(Uniform::new(0,h-1));
let o = b.pos_to_off(x,y);
if b.data[o] == MINE_VAL | HIDDEN_BIT { continue }
else {
b.data[o] |= MINE_VAL;
c -= 1;
for (ox,oy) in NEIGH_OFFS {
let nxr = usize::try_from(x as i8 + ox);
let nyr = usize::try_from(y as i8 + oy);
let _ = nxr.and_then(|nx: usize| { nyr.and_then(|ny: usize| {
if nx > w - 1 || ny > h - 1 { return usize::try_from(-1) };
let off = b.pos_to_off(nx,ny);
let c = &mut b.data[off];
if *c != HIDDEN_BIT | MINE_VAL {
*c += 1;
}
Ok(0)
})
});
}
}
}
b
}
pub fn pos_to_off(&self, x: usize, y: usize) -> usize {
x + y * self.width
}
pub fn flood_reveal(&mut self, x: usize, y: usize) {
if x > self.width || y > self.height { return; }
let off = self.pos_to_off(x,y);
let c = &mut self.data[off];
if *c & HIDDEN_BIT > 0 {
*c &= !HIDDEN_BIT;
if *c > 0 { return }
drop(c);
for (ox,oy) in NEIGH_OFFS {
let nxr = usize::try_from(x as i8 + ox);
let nyr = usize::try_from(y as i8 + 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) };
let off = self.pos_to_off(nx,ny);
let c = &mut self.data[off];
if *c == HIDDEN_BIT {
self.flood_reveal(nx, ny);
}
Ok(0)
})
});
}
}
}
pub fn reveal(mut self, x: usize, y: usize) -> Move {
if x > self.width - 1 || y > self.height - 1 { panic!("OOB reveal"); }
let off = self.pos_to_off(x,y);
self.flood_reveal(x,y);
let c = self.data[off];
Move { 0: self, 1: (c & !(FLAGGED_BIT | CORRECT_BIT)) == MINE_VAL } // Kaboom
}
}
impl Display for Board {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for y in 0..self.height {
for x in 0..self.width {
let c = &self.data[self.pos_to_off(x,y)];
match *c {
0 => write!(f, " ")?,
_ if *c <= 8 => write!(f, "{}", c.to_string())?,
_ if (*c & FLAGGED_BIT) > 0 => write!(f, "F")?,
_ if (*c & HIDDEN_BIT) > 0 => write!(f, "-")?,
_ if (*c & CORRECT_BIT) > 0 => write!(f, "C")?,
_ => write!(f, "?")?,
}
}
writeln!(f, "\r")?;
}
Ok(())
}
}
}
fn main() -> Result<(), io::Error> {
let mut board = minesweeper::Board::new(10,10,100/10);
let mut cursor: (usize, usize) = (5,5);
let mut gstate = 1;
while gstate != 0 {
println!("{}", board);
let done: bool;
let m = playerctrl(board, &mut cursor)?;
(board, done) = (m.0, m.1);
if done { gstate = 0 }
}
Ok(())
}
fn playerctrl(mut board: minesweeper::Board, cursor: &mut (usize, usize)) -> io::Result<minesweeper::Move> {
let stdin = io::stdin();
let lstdin = stdin.lock();
let mut input = lstdin.bytes();
let mut kaboom = false;
match input.next().expect("bad/no input byte")? {
b'w' => cursor.1 -= 1,
b's' => cursor.1 += 1,
b'a' => cursor.0 -= 1,
b'd' => cursor.0 += 1,
b'r' => {
let m = board.reveal(cursor.0, cursor.1);
(board, kaboom) = (m.0, m.1);
},
b'f' => unimplemented!(),
b'q' => kaboom = true,
v => println!("{:?}", v),
};
Ok(minesweeper::Move { 0: board, 1: kaboom })
}
|
