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use std::ops::Not;
use self::Stroke::{Back, Hand};
#[cfg(feature = "serde")]
use serde_crate::{Deserialize, Serialize};
/// Stroke of a row, i.e. handstroke (`Stroke::Hand`) or backstroke (`Stroke::Back`).
#[repr(u8)]
#[derive(Debug, Clone, Copy, Eq, PartialEq, PartialOrd, Ord, Hash)]
#[cfg_attr(
feature = "serde",
derive(Deserialize, Serialize),
serde(crate = "serde_crate", rename_all = "snake_case")
)]
pub enum Stroke {
Hand = 0,
Back = 1,
}
impl Stroke {
/// Returns the `Stroke` which happens `offset` [`Row`](crate::Row)s after a given `start`
/// `Stroke`.
///
/// # Example
///
/// ```
/// use bellframe::Stroke;
///
/// assert_eq!(Stroke::Hand.offset(0), Stroke::Hand);
/// // The row after a backstroke is a handstroke
/// assert_eq!(Stroke::Back.offset(1), Stroke::Hand);
/// assert_eq!(Stroke::Hand.offset(1235124), Stroke::Hand); // Whoa lots of ringing
/// ```
pub fn offset(self, offset: usize) -> Stroke {
if offset % 2 == 0 {
self
} else {
!self
}
}
/// Returns the `Stroke` which happens `offset` [`Row`](crate::Row)s after (or before) `self`.
///
/// # Example
///
/// ```
/// use bellframe::Stroke;
///
/// assert_eq!(Stroke::Hand.offset_i(0), Stroke::Hand);
/// // The row after a backstroke is a handstroke
/// assert_eq!(Stroke::Back.offset_i(1), Stroke::Hand);
/// // The row before a backstroke is also a handstroke
/// assert_eq!(Stroke::Back.offset_i(-1), Stroke::Hand);
/// assert_eq!(Stroke::Hand.offset_i(1235124), Stroke::Hand); // Whoa lots of ringing
/// ```
pub fn offset_i(self, offset: isize) -> Stroke {
if offset % 2 == 0 {
self
} else {
!self
}
}
}
impl Not for Stroke {
type Output = Self;
/// Returns the opposite `Stroke` to `self`
///
/// # Example
///
/// ```
/// use bellframe::Stroke;
///
/// assert_eq!(!Stroke::Hand, Stroke::Back);
/// assert_eq!(!Stroke::Back, Stroke::Hand);
/// ```
fn not(self) -> Self::Output {
match self {
Hand => Back,
Back => Hand,
}
}
}
/// A set of at least one [`Stroke`]
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum StrokeSet {
Hand,
Back,
Both,
}
impl StrokeSet {
pub fn contains(self, stroke: Stroke) -> bool {
match self {
Self::Both => true,
Self::Hand => stroke == Stroke::Hand,
Self::Back => stroke == Stroke::Back,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn offset() {
#[track_caller]
fn check(start: Stroke, offset: usize, expected: Stroke) {
assert_eq!(start.offset(offset), expected);
}
check(Hand, 0, Hand);
check(Back, 0, Back);
check(Hand, 1, Back);
check(Back, 1, Hand);
check(Hand, 123547, Back);
check(Back, 123547, Hand);
check(Hand, usize::MAX, Back); // usize::MAX is odd
check(Back, usize::MAX, Hand);
}
#[test]
fn offset_i() {
#[track_caller]
fn check(start: Stroke, offset: isize, expected: Stroke) {
assert_eq!(start.offset_i(offset), expected);
}
check(Hand, 0, Hand);
check(Back, 0, Back);
check(Hand, 1, Back);
check(Back, 1, Hand);
check(Hand, 123547, Back);
check(Back, 123547, Hand);
check(Hand, isize::MAX, Back); // isize::MAX is odd
check(Back, isize::MAX, Hand);
check(Hand, isize::MIN, Hand); // isize::MIN is even
check(Back, isize::MIN, Back);
}
#[test]
fn not() {
assert_eq!(!Hand, Back);
assert_eq!(!Back, Hand);
}
}