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//! Game board logic.
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const SIZE: usize = 9;
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#[derive(Debug, PartialEq)]
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pub struct Gameboard {
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pub cells: [[u8; SIZE]; SIZE],
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}
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impl Gameboard {
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pub fn new() -> Gameboard {
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Gameboard {
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cells: [[0; SIZE]; SIZE],
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}
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}
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pub fn char(&self, ind: [usize; 2]) -> Option<char> {
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Some(match self.cells[ind[1]][ind[0]] {
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1 => '1',
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2 => '2',
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3 => '3',
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4 => '4',
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5 => '5',
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6 => '6',
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7 => '7',
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8 => '8',
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9 => '9',
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_ => return None,
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})
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}
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pub fn set(&mut self, ind: [usize; 2], val: u8) {
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self.cells[ind[1]][ind[0]] = val;
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}
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pub fn load_sdm(filename: &str) -> Self {
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use std::fs::read_to_string;
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let data = read_to_string(filename).expect("failed to read SDM file");
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let mut cells = [[0; SIZE]; SIZE];
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let mut row = 0;
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let mut col = 0;
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for c in data.chars() {
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if col == SIZE {
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col = 0;
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row += 1;
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}
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if let Some(d) = c.to_digit(10) {
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cells[row][col] = d as u8;
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col += 1;
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}
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}
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Self { cells }
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn load_sdm() {
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let got = Gameboard::load_sdm("static/puzzle.sdm");
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let want = Gameboard {
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cells: [
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[0, 1, 6, 4, 0, 0, 0, 0, 0],
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[2, 0, 0, 0, 0, 9, 0, 0, 0],
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[4, 0, 0, 0, 0, 0, 0, 6, 2],
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[0, 7, 0, 2, 3, 0, 1, 0, 0],
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[1, 0, 0, 0, 0, 0, 0, 0, 3],
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[0, 0, 3, 0, 8, 7, 0, 4, 0],
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[9, 6, 0, 0, 0, 0, 0, 0, 5],
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[0, 0, 0, 8, 0, 0, 0, 0, 7],
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[0, 0, 0, 0, 0, 6, 8, 2, 0],
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],
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};
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assert_eq!(got, want);
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}
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}
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