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use super::circular_index;
use std::ops::{Index, IndexMut};
/// Game of Life universe building blocks (a plane is a circular Vec)
///
/// This is used internally in the implementation of the Universe to allow
/// more readable and safer traversing of the universe blocks
#[derive(Debug, Clone, PartialEq)]
pub(crate) struct Plane<T>(pub Vec<T>);
impl<T> Plane<T> {
pub fn len(&self) -> isize {
self.0.len() as isize
}
}
#[cfg(test)]
mod len {
use super::*;
#[test]
fn get_len() {
assert_eq!(Plane(vec![false, false, true, false, false]).len(), 5);
assert_eq!(Plane(vec![false, false, true, false]).len(), 4);
assert_eq!(Plane(vec![false, false, true]).len(), 3);
}
}
impl<T> Index<isize> for Plane<T> {
type Output = T;
fn index(&self, idx: isize) -> &T {
let len = self.0.len() as isize;
&self.0[circular_index(idx, len)]
}
}
#[cfg(test)]
mod index {
use super::*;
#[test]
fn get_element() {
let p = Plane(vec![false, false, true, false, false]);
assert_eq!(p[0], false);
assert_eq!(p[1], false);
assert_eq!(p[3], false);
assert_eq!(p[4], false);
assert_eq!(p[-3], true);
assert_eq!(p[2], true);
assert_eq!(p[7], true);
}
}
impl<T> IndexMut<isize> for Plane<T> {
fn index_mut(&mut self, idx: isize) -> &mut Self::Output {
let len = self.0.len() as isize;
&mut self.0[circular_index(idx, len)]
}
}
#[cfg(test)]
mod index_mut {
use super::*;
#[test]
fn set_negative_index_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[-3] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
#[test]
fn set_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[2] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
#[test]
fn set_out_of_bound_element() {
let mut p = Plane(vec![false, false, false, false, false]);
p[7] = true;
assert_eq!(p, Plane(vec![false, false, true, false, false]));
}
}
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