From 2c2c78114f36a6b53ad3439fc1b2e541d73047bf Mon Sep 17 00:00:00 2001
From: Lilith Schier <lilith@naalunth.dev>
Date: Thu, 13 Aug 2026 12:22:41 +0200
Subject: [PATCH] added integer division

---
 src/dice.rs    | 10 +++++++++-
 src/parsing.rs |  2 ++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/dice.rs b/src/dice.rs
index e4b2539..aef26a0 100644
--- a/src/dice.rs
+++ b/src/dice.rs
@@ -16,6 +16,7 @@ pub enum Expression {
     Sub(ExpBox, ExpBox),
     Mul(ExpBox, ExpBox),
     Div(ExpBox, ExpBox),
+    IntDiv(ExpBox, ExpBox),
 }
 
 #[derive(Debug, PartialEq, Clone)]
@@ -246,6 +247,12 @@ impl Expression {
                 let rhs = rhs_node.evaluate(rng, w, precedence)?;
                 lhs / rhs
             }
+            IntDiv(lhs_node, rhs_node) => {
+                let lhs = lhs_node.evaluate(rng, w, precedence)?;
+                write!(w, " // ")?;
+                let rhs = rhs_node.evaluate(rng, w, precedence)?;
+                lhs.div_euclid(rhs)
+            }
         };
         if needs_parens {
             write!(w, ")")?;
@@ -306,6 +313,7 @@ impl Expression {
             Expression::Sub(lhs, rhs) => lhs.avg()? - rhs.avg()?,
             Expression::Mul(lhs, rhs) => lhs.avg()? * rhs.avg()?,
             Expression::Div(lhs, rhs) => lhs.avg()? / rhs.avg()?,
+            Expression::IntDiv(lhs, rhs) => lhs.avg()?.div_euclid(rhs.avg()?),
         };
         Ok(result)
     }
@@ -358,7 +366,7 @@ impl Expression {
             Const(_) => 1,
             Dice { .. } => 2,
             Neg(_) => 5,
-            Mul(_, _) | Div(_, _) => 7,
+            Mul(_, _) | Div(_, _) | IntDiv(_, _) => 7,
             Add(_, _) | Sub(_, _) => 8,
         }
     }
diff --git a/src/parsing.rs b/src/parsing.rs
index ef0e51d..1a74101 100644
--- a/src/parsing.rs
+++ b/src/parsing.rs
@@ -90,6 +90,7 @@ fn expr<'c, 'i>(
             fail(),
             complete(alt((
                 binary_op(7, Left, spaced_op("*")),
+                binary_op(7, Left, spaced_op("//")),
                 binary_op(7, Left, spaced_op("/")),
                 binary_op(8, Left, spaced_op("+")),
                 binary_op(8, Left, spaced_op("-")),
@@ -101,6 +102,7 @@ fn expr<'c, 'i>(
                 Ok(match op {
                     Prefix("-", x) => Neg(Box::new(x)),
                     Binary(lhs, "*", rhs) => Mul(Box::new(lhs), Box::new(rhs)),
+                    Binary(lhs, "//", rhs) => IntDiv(Box::new(lhs), Box::new(rhs)),
                     Binary(lhs, "/", rhs) => Div(Box::new(lhs), Box::new(rhs)),
                     Binary(lhs, "+", rhs) => Add(Box::new(lhs), Box::new(rhs)),
                     Binary(lhs, "-", rhs) => Sub(Box::new(lhs), Box::new(rhs)),