1-based rank value

[pluta-lesnura] / src / lib.rs

diff --git a/src/lib.rs b/src/lib.rs
index a5148a0ac6ca147d22e4c699c0a5e9d4230d3caf..c0475b328fc5cfe900835c73aff98aa94d4b7f15 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,53 @@
 use rand::Rng;
 
 pub const NUM_RANKS: u8 = 13;
+pub const NUM_SUITS: u8 = 4;
+pub const NUM_JOKERS: u8 = 2;
+pub const NUM_CARDS: u8 = NUM_RANKS * NUM_SUITS + NUM_JOKERS;
 
 #[derive(Clone, Copy, Eq, PartialEq)]
 pub struct Rank(u8);
+impl Rank {
+    #[must_use]
+    pub fn value(&self) -> u8 {
+        self.0 + 1
+    }
+}
+
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub struct Suit(u8);
+
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub struct Card(u8);
+impl Card {
+    #[must_use]
+    pub fn is_joker(&self) -> bool {
+        self.0 >= NUM_RANKS * NUM_SUITS
+    }
+    #[must_use]
+    pub fn rank(&self) -> Option<Rank> {
+        (!self.is_joker()).then_some(Rank(self.0 >> 2))
+    }
+    #[must_use]
+    pub fn suit(&self) -> Option<Suit> {
+        (!self.is_joker()).then_some(Suit(self.0 & 3))
+    }
+}
+
+#[derive(Clone, Copy)]
+pub enum WithOrWithoutJokers {
+    WithJokers,
+    WithoutJokers,
+}
+
+#[must_use]
+pub fn deck(j: WithOrWithoutJokers) -> Vec<Card> {
+    let limit = match j {
+        WithOrWithoutJokers::WithJokers => NUM_CARDS,
+        WithOrWithoutJokers::WithoutJokers => NUM_SUITS * NUM_RANKS,
+    };
+    (0..limit).map(Card).collect()
+}
 
 #[derive(Clone, Copy)]
 pub struct PathLength(Rank);
@@ -61,4 +105,18 @@ mod tests {
         }
         assert!(pli.reveal_random(length).is_none());
     }
+
+    #[test]
+    fn test_deck() {
+        use WithOrWithoutJokers::*;
+        let d = deck(WithoutJokers);
+        let rank_sum: u32 = d
+            .iter()
+            .map(Card::rank)
+            .flatten()
+            .map(|r| u32::from(r.value()))
+            .sum();
+        assert_eq!(rank_sum, 364);
+        let _dj = deck(WithJokers);
+    }
 }