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pub const NUM_CARDS: u8 = 13;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Card {
A, K, Q, J, T,
Nine, Eight, Seven, Six, Five, Four, Three, Two
}
impl Card {
fn key(self: & Self) -> usize {
match self {
Self::Two => 0,
Self::Three => 1,
Self::Four => 2,
Self::Five => 3,
Self::Six => 4,
Self::Seven => 5,
Self::Eight => 6,
Self::Nine => 7,
Self::T => 8,
Self::J => 9,
Self::Q => 10,
Self::K => 11,
Self::A => 12
}
}
pub fn value(self: & Self) -> u8 {
match self {
Self::Two => 2,
Self::Three => 3,
Self::Four => 4,
Self::Five => 5,
Self::Six => 6,
Self::Seven => 7,
Self::Eight => 8,
Self::Nine => 9,
Self::T => 10,
Self::J => 1,
Self::Q => 11,
Self::K => 12,
Self::A => 13
}
}
}
impl TryFrom<u8> for Card {
type Error = &'static str;
fn try_from(c: u8) -> Result<Self, Self::Error> {
match c {
b'A' => Ok(Self::A),
b'K' => Ok(Self::K),
b'Q' => Ok(Self::Q),
b'J' => Ok(Self::J),
b'T' => Ok(Self::T),
b'9' => Ok(Self::Nine),
b'8' => Ok(Self::Eight),
b'7' => Ok(Self::Seven),
b'6' => Ok(Self::Six),
b'5' => Ok(Self::Five),
b'4' => Ok(Self::Four),
b'3' => Ok(Self::Three),
b'2' => Ok(Self::Two),
_ => Err("ASCII character not a valid card")
}
}
}
impl PartialOrd for Card {
fn partial_cmp(self: & Self, other: & Self) -> Option<core::cmp::Ordering> {
self.value().partial_cmp(& other.value())
}
}
impl Ord for Card {
fn cmp(self: & Self, other: & Self) -> core::cmp::Ordering {
self.value().cmp(& other.value())
}
}
#[derive(Debug, Eq, PartialEq)]
pub struct Hand {
cards: [Card; 5],
histogram: [u8; NUM_CARDS as usize],
num_jokers: u8
}
impl Hand {
fn count(self: & Self, card: Card) -> u8 {
if card == Card::J {
self.num_jokers
}
else {
self.histogram[card.key()]
}
}
pub fn new(cards: [Card; 5]) -> Self {
let mut histogram: [u8; NUM_CARDS as usize] = [0; NUM_CARDS as usize];
let mut num_jokers: u8 = 0;
for card in cards.into_iter() {
if card == Card::J {
num_jokers += 1;
}
else {
histogram[card.key()] += 1;
}
}
Self { cards: cards, histogram: histogram, num_jokers: num_jokers }
}
pub fn is_n_of_a_kind(self: & Self, n: u8, count_jokers: bool) -> bool {
let num_jokers = if count_jokers { self.count(Card::J) } else { 0 };
self.histogram.into_iter().find(|& count| count + num_jokers == n).is_some()
}
pub fn is_full_house(self: & Self) -> bool {
(self.is_n_of_a_kind(3, false) && self.is_n_of_a_kind(2, false))
|| (self.is_two_pairs() && self.count(Card::J) >= 1 )
}
pub fn is_two_pairs(self: & Self) -> bool {
self.histogram.into_iter()
.position(|count| count == 2)
.and_then(|i| (& self.histogram[i+1..]).into_iter()
.position(|& count| count == 2))
.is_some()
}
pub fn strength(self: & Self) -> u8 {
if self.is_n_of_a_kind(5, true) { 6 }
else if self.is_n_of_a_kind(4, true) { 5 }
else if self.is_full_house() { 4 }
else if self.is_n_of_a_kind(3, true) { 3 }
else if self.is_two_pairs() { 2 }
else if self.is_n_of_a_kind(2, true) { 1 }
else { 0 }
}
}
impl PartialOrd for Hand {
fn partial_cmp(self: & Self, other: & Self) -> Option<core::cmp::Ordering> {
let strength_ord = self.strength().cmp(& other.strength());
if strength_ord == core::cmp::Ordering::Equal {
Some(self.cards.cmp(& other.cards))
}
else {
Some(strength_ord)
}
}
}
impl Ord for Hand {
fn cmp(self: & Self, other: & Self) -> core::cmp::Ordering {
let strength_ord = self.strength().cmp(& other.strength());
if strength_ord == core::cmp::Ordering::Equal {
self.cards.cmp(& other.cards)
}
else {
strength_ord
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_joker_1() {
assert!(Hand::new([Card::T, Card::Five, Card::Five, Card::J, Card::Five]).is_n_of_a_kind(4, true));
}
#[test]
fn test_joker_fh() {
assert!(Hand::new([Card::T, Card::T, Card::Five, Card::Five, Card::J]).is_full_house());
}
}
|
