Much work fleshing out cards and hands.

src/card.rs

@@ -0,0 +1,100 @@
+use rand::Rng;
+use std::fmt;
+
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub enum CardSuit {
+    Diamonds,
+    Clubs,
+    Hearts,
+    Spades,
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, PartialOrd, Ord, Hash)]
+pub enum CardValue {
+    Two = 2,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine,
+    Ten,
+    Jack,
+    Queen,
+    King,
+    Ace,
+}
+
+#[derive(PartialEq, Eq)]
+pub struct PlayingCard {
+    pub value: CardValue,
+    pub suit: CardSuit,
+}
+
+impl Ord for PlayingCard {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.value.cmp(&other.value)
+    }
+}
+
+impl PartialOrd for PlayingCard {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        self.value.partial_cmp(&other.value)
+    }
+}
+
+impl fmt::Display for PlayingCard {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let suit = match self.suit {
+            CardSuit::Clubs => "♣",
+            CardSuit::Diamonds => "♦",
+            CardSuit::Hearts => "♥",
+            CardSuit::Spades => "♠",
+        };
+
+        write!(f, "{:?}{}", self.value, suit)
+    }
+}
+
+pub fn draw_card(deck: &mut Vec<PlayingCard>) -> PlayingCard {
+    let num = rand::thread_rng().gen_range(0..deck.len());
+    let card = deck.remove(num);
+
+    card
+}
+
+pub fn create_deck() -> Vec<PlayingCard> {
+    let mut deck: Vec<PlayingCard> = vec![];
+    let suits = [
+        CardSuit::Diamonds,
+        CardSuit::Clubs,
+        CardSuit::Hearts,
+        CardSuit::Spades,
+    ];
+
+    let values = [
+        CardValue::Two,
+        CardValue::Three,
+        CardValue::Four,
+        CardValue::Five,
+        CardValue::Six,
+        CardValue::Seven,
+        CardValue::Eight,
+        CardValue::Nine,
+        CardValue::Ten,
+        CardValue::Jack,
+        CardValue::Queen,
+        CardValue::King,
+        CardValue::Ace,
+    ];
+
+    for s in suits {
+        for i in values {
+            let card = PlayingCard { suit: s, value: i };
+            deck.insert(0, card);
+        }
+    }
+
+    deck
+}

src/hand.rs

@@ -0,0 +1,174 @@
+use crate::card::{CardValue, PlayingCard};
+use core::fmt;
+use std::collections::HashMap;
+
+#[derive(Clone, Copy, PartialEq, Eq, Ord, PartialOrd)]
+pub enum HandType {
+    HighCard,
+    OnePair,
+    TwoPair,
+    ThreeOfAKind,
+    Straight,
+    Flush,
+    FullHouse,
+    FourOfAKind,
+    StraightFlush,
+}
+
+struct PokerHand {
+    cards: Vec<PlayingCard>,
+}
+
+impl fmt::Display for PokerHand {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let s = match self.hand_type() {
+            HandType::HighCard => write!(f, "{}", self.cards[4]),
+            HandType::OnePair => {
+                for val in self.hash_map() {
+                    if val.1 == 2 {
+                        return write!(f, "Pair of {:?}'s", val);
+                    }
+                }
+                return write!(f, "???");
+            }
+            HandType::TwoPair => todo!(),
+            HandType::ThreeOfAKind => todo!(),
+            HandType::Straight => todo!(),
+            HandType::Flush => todo!(),
+            HandType::FullHouse => todo!(),
+            HandType::FourOfAKind => todo!(),
+            HandType::StraightFlush => todo!(),
+        };
+
+        s
+    }
+}
+
+impl PokerHand {
+    fn new(mut cards: Vec<PlayingCard>) -> Self {
+        assert!(cards.len() == 5);
+        cards.sort_unstable();
+        PokerHand { cards }
+    }
+
+    fn hash_map(&self) -> HashMap<CardValue, u8> {
+        let mut count: HashMap<CardValue, u8> = HashMap::new();
+
+        for card in &self.cards {
+            *count.entry(card.value).or_insert(0) += 1;
+        }
+
+        count
+    }
+
+    fn hand_type(&self) -> HandType {
+        if is_straight_flush(self) {
+            return HandType::StraightFlush;
+        }
+
+        if is_four_of_a_kind(self) {
+            return HandType::FourOfAKind;
+        }
+
+        if is_full_house(self) {
+            return HandType::FullHouse;
+        }
+
+        if is_flush(self) {
+            return HandType::Flush;
+        }
+
+        if is_straight(self) {
+            return HandType::Straight;
+        }
+
+        if is_three_of_a_kind(self) {
+            return HandType::ThreeOfAKind;
+        }
+
+        if is_two_pair(self) {
+            return HandType::TwoPair;
+        }
+
+        if is_one_pair(self) {
+            return HandType::OnePair;
+        }
+
+        return HandType::HighCard;
+    }
+}
+
+fn is_straight_flush(hand: &PokerHand) -> bool {
+    let hand = &hand.cards;
+    assert!(hand.len() == 5);
+
+    let suit = hand[0].suit;
+    let mut min_val = CardValue::Two;
+    let mut max_val = CardValue::Ace;
+
+    // Must all be the same suit
+    for i in 0..5 {
+        let card = &hand[i];
+
+        for k in (i + 1)..5 {
+            if hand[k].value == card.value {
+                return false;
+            }
+        }
+
+        if card.value < min_val {
+            min_val = card.value;
+        };
+
+        if card.value > max_val {
+            max_val = card.value;
+        }
+
+        if card.suit != suit {
+            return false;
+        }
+    }
+
+    let max_val = max_val as u8;
+    let min_val = min_val as u8;
+
+    if max_val - min_val > 4 {
+        return false;
+    }
+
+    true
+}
+
+fn is_four_of_a_kind(hand: &PokerHand) -> bool {
+    for e in hand.hash_map() {
+        if e.1 == 4 {
+            return true;
+        }
+    }
+
+    false
+}
+
+fn is_full_house(hand: &PokerHand) -> bool {
+    false
+}
+
+fn is_flush(hand: &PokerHand) -> bool {
+    false
+}
+
+fn is_straight(hand: &PokerHand) -> bool {
+    false
+}
+
+fn is_three_of_a_kind(hand: &PokerHand) -> bool {
+    false
+}
+
+fn is_two_pair(hand: &PokerHand) -> bool {
+    false
+}
+
+fn is_one_pair(hand: &PokerHand) -> bool {
+    false
+}

src/main.rs

@@ -1,154 +1,41 @@
-use rand::Rng;
-use std::collections::HashMap;
-use std::fmt;
+#![allow(dead_code)]
+
 use std::vec;
 
-#[derive(Clone, Copy, Eq, PartialEq)]
-enum CardSuit {
-    Diamonds,
-    Clubs,
-    Hearts,
-    Spades,
-}
+mod card;
+mod hand;
 
-struct PlayingCard {
-    value: u8,
-    suit: CardSuit,
-}
-
-fn is_straight_flush(hand: &Vec<PlayingCard>) -> bool {
-    assert!(hand.len() == 5);
-
-    let suit = hand[0].suit;
-    let mut min_val = 15;
-    let mut max_val = 1;
-
-    // Must all be the same suit
-    for i in 0..5 {
-        let card = &hand[i];
-
-        for k in (i + 1)..5 {
-            if hand[k].value == card.value {
-                return false;
-            }
-        }
-
-        if card.value < min_val {
-            min_val = card.value;
-        };
-
-        if card.value > max_val {
-            max_val = card.value;
-        }
-
-        if card.suit != suit {
-            return false;
-        }
-    }
-
-    if max_val - min_val > 4 {
-        return false;
-    }
-
-    true
-}
-
-fn is_four_of_a_kind(hand: &Vec<PlayingCard>) -> bool {
-    let mut count: HashMap<u8, u8> = HashMap::new();
-
-    for card in hand {
-        *count.entry(card.value).or_insert(0) += 1;
-    }
-
-    for e in count {
-        if e.1 == 4 {
-            return true;
-        }
-    }
-
-    false
-}
-
-impl fmt::Display for PlayingCard {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let val = match self.value {
-            2 => "Two",
-            3 => "Three",
-            4 => "Four",
-            5 => "Five",
-            6 => "Six",
-            7 => "Seven",
-            8 => "Eight",
-            9 => "Nine",
-            10 => "Ten",
-            11 => "Jack",
-            12 => "King",
-            13 => "Queen",
-            14 => "Ace",
-            _ => "???",
-        };
-
-        let suit = match self.suit {
-            CardSuit::Clubs => "Clubs",
-            CardSuit::Diamonds => "Diamonds",
-            CardSuit::Hearts => "Hearts",
-            CardSuit::Spades => "Spades",
-        };
-
-        write!(f, "{} of {}", val, suit)
-    }
-}
-
-fn draw_card(deck: &mut Vec<PlayingCard>) -> PlayingCard {
-    let num = rand::thread_rng().gen_range(0..deck.len());
-    let card = deck.remove(num);
-
-    card
-}
-
-fn create_deck() -> Vec<PlayingCard> {
-    let mut deck: Vec<PlayingCard> = vec![];
-
-    for s in [
-        CardSuit::Diamonds,
-        CardSuit::Clubs,
-        CardSuit::Hearts,
-        CardSuit::Spades,
-    ] {
-        for i in 2..14 {
-            let card = PlayingCard { suit: s, value: i };
-            deck.insert(0, card);
-        }
-    }
-
-    deck
-}
+use crate::card::{create_deck, CardSuit, CardValue, PlayingCard};
+use crate::hand::HandType;
 
 fn main() {
     let mut deck = create_deck();
 
     let card1: PlayingCard = PlayingCard {
         suit: CardSuit::Clubs,
-        value: 2,
+        value: CardValue::Five,
     };
     let card2: PlayingCard = PlayingCard {
         suit: CardSuit::Clubs,
-        value: 2,
+        value: CardValue::Five,
     };
     let card3: PlayingCard = PlayingCard {
         suit: CardSuit::Clubs,
-        value: 2,
+        value: CardValue::Five,
     };
     let card4: PlayingCard = PlayingCard {
         suit: CardSuit::Clubs,
-        value: 2,
+        value: CardValue::Five,
     };
     let card5: PlayingCard = PlayingCard {
         suit: CardSuit::Clubs,
-        value: 3,
+        value: CardValue::Five,
     };
 
     let hand = vec![card1, card2, card3, card4, card5];
 
-    println!("{}", is_four_of_a_kind(&hand));
+    let hand1 = HandType::Flush;
+    let hand2 = HandType::StraightFlush;
+
+    println!("{}", hand1 >= hand2);
 }