From 511beade910e5115f46d79342af76b81f85cf336 Mon Sep 17 00:00:00 2001
From: brian cully <bjc@spork.org>
Date: Tue, 23 Dec 2025 15:24:24 -0500
Subject: change out to a single datum

it can only get, at most, one item per tick, so only represent that.
---
 src/forth/vm.rs | 9 ++++-----
 src/lib.rs      | 4 +---
 2 files changed, 5 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/forth/vm.rs b/src/forth/vm.rs
index 25ed516..6bab8b9 100644
--- a/src/forth/vm.rs
+++ b/src/forth/vm.rs
@@ -126,7 +126,7 @@ pub struct VM {
     pub wordlist: WordList,
     pub ip: InstructionPointer,
 
-    pub out: Vec<String>,
+    pub out: Option<DataStackType>,
     pub heading: DataStackType,
     pub speed: DataStackType,
     pub doppler: DataStackType,
@@ -153,7 +153,7 @@ impl VM {
             ip: InstructionPointer::new(),
             wordlist,
 
-            out: vec![],
+            out: None,
             heading: 0,
             speed: 0,
             doppler: 0,
@@ -313,7 +313,7 @@ impl VM {
             }
             OpCode::Say => {
                 let v = self.stack.0.pop().ok_or(RuntimeError::StackUnderflow)?;
-                self.out.push(format!("{}", v));
+                let _ = self.out.insert(v);
             }
             OpCode::Heading => {
                 self.stack.0.push(self.heading);
@@ -829,8 +829,7 @@ mod tests {
         let mut vm = VM::new(wordlist);
         vm.run().expect("should run to completion");
         assert_eq!(vm.stack.0.len(), 0, "empty stack");
-        assert_eq!(vm.out.len(), 1, "output length");
-        assert_eq!(vm.out[0], "-1", "output value");
+        assert_eq!(vm.out.expect("output is set"), -1, "output value");
     }
 
     #[test]
diff --git a/src/lib.rs b/src/lib.rs
index 240acf1..fc4a95b 100755
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -171,9 +171,7 @@ impl ExportedVM {
         res.set(&"callstack".into(), &(&vm.callstack).into());
 
         let vars = js_sys::Map::new();
-        let mut out = vec![];
-        std::mem::swap(&mut out, &mut vm.out);
-        vars.set(&"out".into(), &out.into());
+        vars.set(&"out".into(), &vm.out.take().into());
         vars.set(&"heading".into(), &vm.heading.into());
         vars.set(&"speed".into(), &vm.speed.into());
         vars.set(&"doppler".into(), &vm.doppler.into());
-- 
cgit v1.3