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The basic idea is here, we still have problems with the mutability

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Julio Biason 4 years ago
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2 changed files with 270 additions and 128 deletions
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  1. 385
      rust/bowling/src/lib.rs
  2. 13
      rust/bowling/tests/bowling.rs

385
rust/bowling/src/lib.rs
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@ -1,186 +1,315 @@
#[deny(warnings, missing_docs)]
/// Errors created when in the game
#[derive(Debug, PartialEq)]
pub enum Error {
/// The throw is higher the number of pins available.
NotEnoughPinsLeft,
/// The game is over, no more throws are possible.
GameComplete,
}
/// A throw; holds the information on how many pins where knocked or None if the throw wasn't done
/// yet.
#[derive(Debug)]
struct Throw(Option<u16>);
impl Throw {
fn new() -> Self {
Self(None)
}
/// A throw.
// I'd usually move those to their own file, but since Exercism wants a single file... here we go.
mod throw {
#[deny(warnings, missing_docs)]
use std::fmt;
/// True if the throw is a strike
fn is_strike(&self) -> bool {
self.0.unwrap_or(0) == 10
}
#[derive(PartialEq)]
enum ThrowType {
/// This throw doesn't exist yet; the player did something (a strike, a spare) that gave
/// them another throw.
Free,
/// This throw happened.
fn is_some(&self) -> bool {
self.0.is_some()
/// Pins knocked (or not, if the value is 0).
Knock(u16),
}
fn score(&self) -> u16 {
self.0.unwrap_or(0)
pub struct Throw {
/// The throw id; it is used only for our debugging reference.
id: usize,
/// The result of the throw.
result: ThrowType,
}
}
enum RollType {
Normal,
Streak,
Strike,
}
impl Throw {
/// Create a free Throw
pub fn new_free(id: usize) -> Self {
Self {
id: id,
result: ThrowType::Free,
}
}
/// A normal Roll; the player has the chance of throwing two balls in this.
#[derive(Debug)]
struct Normal(Throw, Throw);
impl Normal {
fn new() -> Self {
Self(Throw::new(), Throw::new())
}
/// Create a throw that knocked some pins
pub fn new(id: usize, pins: u16) -> Self {
Self {
id: id,
result: ThrowType::Knock(pins),
}
}
fn is_complete(&self) -> bool {
self.0.is_strike() || (self.0.is_some() && self.1.is_some())
}
/// In-place update of a free throw
pub fn update(&mut self, pins: u16) {
// Silently refusing to update a non-free throw result.
if self.result == ThrowType::Free {
self.result = ThrowType::Knock(pins);
}
}
fn roll(&mut self, pins: u16) {
if self.0.is_some() {
self.1 = Throw(Some(pins))
} else {
self.0 = Throw(Some(pins))
/// Indicate that the Throw is a free and has no value.
pub fn is_free_throw(&self) -> bool {
self.result == ThrowType::Free
}
}
fn score(&self) -> u16 {
self.0.score() + self.1.score()
/// Indicate that the player made a strike with this throw.
pub fn is_strike(&self) -> bool {
self.result == ThrowType::Knock(10)
}
/// Score of this throw.
pub fn score(&self) -> Option<u16> {
match self.result {
ThrowType::Free => None,
ThrowType::Knock(x) => Some(x),
}
}
}
fn post_streak_score(&self) -> u16 {
self.0.score() * 2 + self.1.score()
/// A different debug information, so it will be easier to read.
impl fmt::Debug for Throw {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{}-{}",
self.id,
match self.result {
ThrowType::Free => "Free".into(),
ThrowType::Knock(x) => format!("{}", x),
}
)
}
}
fn roll_type(&self) -> RollType {
if self.0.score() == 10 {
RollType::Strike
} else {
if self.0.score() + self.1.score() == 10 {
RollType::Streak
} else {
RollType::Normal
}
#[cfg(test)]
mod throw_tests {
#[test]
fn make_free() {
let throw = super::Throw::new_free(1);
assert!(throw.is_free_throw());
assert_eq!("1-Free", format!("{:?}", throw));
}
#[test]
fn make_strike() {
let throw = super::Throw::new(1, 10);
assert!(!throw.is_free_throw());
assert_eq!("1-10", format!("{:?}", throw));
assert!(throw.is_strike());
}
#[test]
fn update() {
let mut throw = super::Throw::new_free(1);
assert_eq!(throw.score(), None);
throw.update(5);
assert_eq!(throw.score(), Some(5));
}
}
}
/// The last Roll is special: It can be three if the player hits at least one strike or make a
/// streak.
#[derive(Debug)]
struct Last(Throw, Throw, Throw);
impl Last {
fn new() -> Self {
Self(Throw::new(), Throw::new(), Throw::new())
}
/// A game frame
mod frame {
#[deny(warnings, missing_docs)]
use std::fmt;
use std::rc::Rc;
fn is_complete(&self) -> bool {
self.0.is_some() && self.1.is_some()
use super::throw::Throw;
pub struct Frame {
id: usize,
throws: Vec<Rc<Throw>>,
}
fn roll(&mut self, pins: u16) {
if self.0.is_some() {
if self.1.is_some() {
self.2 = Throw(Some(pins))
impl Frame {
pub fn new(id: usize) -> Self {
Self {
id: id,
throws: vec![],
}
}
pub fn add_throw(&mut self, throw: &Rc<Throw>) {
self.throws.push(throw.clone());
}
pub fn score(&self) -> Option<u16> {
if self.throws.len() == 0 || self.throws.iter().any(|throw| throw.is_free_throw()) {
None
} else {
self.1 = Throw(Some(pins))
Some(self.throws.iter().map(|throw| throw.score().unwrap()).sum())
}
} else {
self.0 = Throw(Some(pins))
}
pub fn is_spare(&self) -> bool {
self.throws.len() == 2 && self.score() == Some(10)
}
}
fn score(&self) -> u16 {
self.0.score() + self.1.score() + self.2.score()
/// A different debug information, so it will be easier to read.
impl fmt::Debug for Frame {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{}-{} ({})",
self.id,
match self.score() {
None => "??".into(),
Some(x) => format!("{}", x),
},
self.throws
.iter()
.map(|x| format!("{:?}", x))
.collect::<Vec<String>>()
.join(",")
)
}
}
#[cfg(test)]
mod frame_tests {
#[test]
fn no_score() {
let frame = super::Frame::new(1);
assert_eq!(frame.score(), None);
}
#[test]
fn score() {
let mut frame = super::Frame::new(1);
let throw = super::Throw::new(1, 10);
frame.add_throw(&super::Rc::new(throw));
assert_eq!(frame.score(), Some(10));
}
#[test]
fn no_score_with_free_throws() {
let mut frame = super::Frame::new(1);
let throw1 = super::Throw::new(1, 5);
let throw2 = super::Throw::new_free(2);
frame.add_throw(&super::Rc::new(throw1));
frame.add_throw(&super::Rc::new(throw2));
assert_eq!(frame.score(), None);
}
#[test]
fn debug() {
let mut frame = super::Frame::new(1);
let throw1 = super::Throw::new(1, 5);
let throw2 = super::Throw::new_free(2);
frame.add_throw(&super::Rc::new(throw1));
frame.add_throw(&super::Rc::new(throw2));
assert_eq!("1-?? (1-5,2-Free)", format!("{:?}", frame));
}
}
}
use std::rc::Rc;
pub struct BowlingGame {
frames: [Normal; 9],
last: Last,
current_frame: usize,
frames: Vec<frame::Frame>,
throws: Vec<Rc<throw::Throw>>,
}
impl BowlingGame {
pub fn new() -> Self {
Self {
frames: [
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
Normal::new(),
],
last: Last::new(),
current_frame: 0,
frames: vec![],
throws: vec![],
}
}
pub fn roll(&mut self, pins: u16) -> Result<(), Error> {
if pins > 10 {
Err(Error::NotEnoughPinsLeft)
if !self.has_free_throws() && self.is_finished() {
Err(Error::GameComplete)
} else {
// is this the last throw or a normal throw?
if dbg!(self.current_frame == 9) {
self.roll_last(pins)
} else {
self.roll_normal(pins)
let throw = self.make_throw(pins);
let last_id = self.throws.len();
let frame = self.last_frame();
frame.add_throw(&throw);
// check if the player gained any free throws.
if pins == 10 {
// a strike, you get 2 free throws
let new_throw = Rc::new(throw::Throw::new_free(last_id + 1));
self.throws.push(new_throw.clone());
frame.add_throw(&new_throw);
let new_throw = Rc::new(throw::Throw::new_free(last_id + 2));
self.throws.push(new_throw.clone());
frame.add_throw(&new_throw);
} else if frame.is_spare() {
// in a spare, just one throw
let new_throw = Rc::new(throw::Throw::new_free(last_id + 1));
self.throws.push(new_throw.clone());
frame.add_throw(&new_throw);
}
}
}
fn roll_last(&mut self, pins: u16) -> Result<(), Error> {
if self.last.is_complete() {
Err(Error::GameComplete)
} else {
self.last.roll(pins);
dbg!(&self.last);
dbg!(&self.throws);
dbg!(&self.frames);
Ok(())
}
}
fn roll_normal(&mut self, pins: u16) -> Result<(), Error> {
if dbg!(self.frames[self.current_frame].is_complete()) {
self.current_frame += 1;
self.roll(pins)
} else {
Ok(self.frames[self.current_frame].roll(pins))
}
pub fn score(&self) -> Option<u16> {
None
// if !self.is_finished() {
// None
// } else {
// Some(self.frames.iter().map(|x| x.score()).sum())
// }
}
pub fn score(&self) -> Option<u16> {
// the only way to have a score is when all throws when done. And for that, we know that
// the last throw must have something.
if self.last.is_complete() {
// Accumulator: (total_score_so_far, roll_type_in_the_previous_frame)
let (total, _) =
self.frames
.iter()
.fold((0, RollType::Normal), |(total, previous_roll), frame| {
let frame_score = match previous_roll {
RollType::Strike => frame.score() * 2,
RollType::Streak => frame.post_streak_score(),
RollType::Normal => frame.score(),
};
(total + frame_score, frame.roll_type())
});
Some(total + self.last.score())
} else {
None
/// If there are free throws, update the most recent one; if there are none, create a new
/// throw.
fn make_throw(&mut self, pins: u16) -> Rc<throw::Throw> {
let new_id = self.throws.len() + 1;
self.throws
.iter_mut()
.filter(|x| x.is_free_throw())
.take(1)
.next()
.map_or(Rc::new(throw::Throw::new_free(new_id)), |x| {
let throw = Rc::get_mut(x).unwrap();
throw.update(pins);
x.clone()
})
}
/// Check if the list of throws in the game there are at least one free.
fn has_free_throws(&self) -> bool {
self.throws.iter().any(|x| x.is_free_throw())
}
/// The game is over when there are 10 frames of scores.
fn is_finished(&self) -> bool {
self.frames.len() == 10
}
/// Get the last/current frame.
fn last_frame(&mut self) -> &mut frame::Frame {
if self.frames.len() == 0 {
let new_id = self.frames.len() + 1;
self.frames.push(frame::Frame::new(new_id));
}
self.frames.iter_mut().last().unwrap()
}
}

13
rust/bowling/tests/bowling.rs
Unescape View File

@ -1,18 +1,21 @@
use bowling::*;
#[test]
#[ignore]
fn roll_returns_a_result() {
let mut game = BowlingGame::new();
assert!(game.roll(0).is_ok());
}
#[test]
#[ignore]
fn you_cannot_roll_more_than_ten_pins_in_a_single_roll() {
let mut game = BowlingGame::new();
assert_eq!(game.roll(11), Err(Error::NotEnoughPinsLeft));
}
#[test]
#[ignore]
fn a_game_score_is_some_if_ten_frames_have_been_rolled() {
let mut game = BowlingGame::new();
@ -25,12 +28,14 @@ fn a_game_score_is_some_if_ten_frames_have_been_rolled() {
}
#[test]
#[ignore]
fn you_cannot_score_a_game_with_no_rolls() {
let game = BowlingGame::new();
assert_eq!(game.score(), None);
}
#[test]
#[ignore]
fn a_game_score_is_none_if_fewer_than_ten_frames_have_been_rolled() {
let mut game = BowlingGame::new();
@ -43,6 +48,7 @@ fn a_game_score_is_none_if_fewer_than_ten_frames_have_been_rolled() {
}
#[test]
#[ignore]
fn a_roll_is_err_if_the_game_is_done() {
let mut game = BowlingGame::new();
@ -55,6 +61,7 @@ fn a_roll_is_err_if_the_game_is_done() {
}
#[test]
#[ignore]
fn twenty_zero_pin_rolls_scores_zero() {
let mut game = BowlingGame::new();
@ -66,6 +73,7 @@ fn twenty_zero_pin_rolls_scores_zero() {
}
#[test]
#[ignore]
fn ten_frames_without_a_strike_or_spare() {
let mut game = BowlingGame::new();
@ -78,6 +86,7 @@ fn ten_frames_without_a_strike_or_spare() {
}
#[test]
#[ignore]
fn spare_in_the_first_frame_followed_by_zeros() {
let mut game = BowlingGame::new();
@ -92,6 +101,7 @@ fn spare_in_the_first_frame_followed_by_zeros() {
}
#[test]
#[ignore]
fn points_scored_in_the_roll_after_a_spare_are_counted_twice_as_a_bonus() {
let mut game = BowlingGame::new();
@ -107,6 +117,7 @@ fn points_scored_in_the_roll_after_a_spare_are_counted_twice_as_a_bonus() {
}
#[test]
#[ignore]
fn consecutive_spares_each_get_a_one_roll_bonus() {
let mut game = BowlingGame::new();
@ -140,6 +151,7 @@ fn if_the_last_frame_is_a_spare_you_get_one_extra_roll_that_is_scored_once() {
}
#[test]
#[ignore]
fn a_strike_earns_ten_points_in_a_frame_with_a_single_roll() {
let mut game = BowlingGame::new();
@ -153,6 +165,7 @@ fn a_strike_earns_ten_points_in_a_frame_with_a_single_roll() {
}
#[test]
#[ignore]
fn points_scored_in_the_two_rolls_after_a_strike_are_counted_twice_as_a_bonus() {
let mut game = BowlingGame::new();

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