From 855e55bff7a9186bbaffc99bab319f06b07dad65 Mon Sep 17 00:00:00 2001
From: mehbark <terezi@pyrope.net>
Date: Mon, 17 Apr 2023 16:44:10 -0400
Subject: [PATCH] nothing's falsity can unwind the unwary

---
 src/App.tsx | 98 ++++++++++++++++++++++++++---------------------------
 1 file changed, 49 insertions(+), 49 deletions(-)

diff --git a/src/App.tsx b/src/App.tsx
index 142cbf6..9315f6b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -246,7 +246,6 @@ function parse_op(op: string): Option<Op> {
         case "swp":
             return op;
     }
-    console.log(op);
 }
 
 type State = {
@@ -262,7 +261,7 @@ const INITIAL_STATE: State = {
 };
 
 function steps(state: State, ops: Op[], limit = 300, num_steps = 0): State[] {
-    if (!ops[state.ip] || num_steps > limit) {
+    if (typeof ops[state.ip] == "undefined" || num_steps > limit) {
         return [state];
     }
     return cons(
@@ -288,55 +287,56 @@ function step(state: State, op: Op): State {
 
     if (typeof op == "number") {
         ns.stack.push(op);
-    } else {
-        switch (op) {
-            case "add":
-                binary_op(0, 0, (a, b) => a + b);
-                break;
-            case "sub":
-                binary_op(0, 0, (a, b) => a - b);
-                break;
-            case "mul":
-                binary_op(0, 1, (a, b) => a * b);
-                break;
-            case "div":
-                binary_op(0, 1, (a, b) => a / b);
-                break;
-            case "put": {
-                let popped = ns.stack.pop();
-                if (typeof popped != "undefined") {
-                    ns.output.push(popped);
-                }
-                break;
-            }
-            case "jmp":
-                ns.ip--;
-                ns.ip += ns.stack.pop() ?? 1;
-                break;
-            case "dup": {
-                let popped = ns.stack.pop();
-                if (typeof popped != "undefined") {
-                    ns.stack.push(popped, popped);
-                }
-                break;
-            }
-            case "del":
-                ns.stack.pop();
-                break;
-            case "cmp": {
-                let [a, b] = [ns.stack.pop() ?? 0, ns.stack.pop() ?? 0];
-                // matter of taste
-                ns.stack.push(cmp(b, a));
-                break;
-            }
-            case "swp": {
-                let [a, b] = [ns.stack.pop(), ns.stack.pop()];
-                if (typeof a == "undefined" || typeof b == "undefined") {
-                    break;
-                }
-                ns.stack.push(a, b);
+        return ns;
+    }
+
+    switch (op) {
+        case "add":
+            binary_op(0, 0, (a, b) => a + b);
+            break;
+        case "sub":
+            binary_op(0, 0, (a, b) => a - b);
+            break;
+        case "mul":
+            binary_op(0, 1, (a, b) => a * b);
+            break;
+        case "div":
+            binary_op(0, 1, (a, b) => a / b);
+            break;
+        case "put": {
+            let popped = ns.stack.pop();
+            if (typeof popped != "undefined") {
+                ns.output.push(popped);
+            }
+            break;
+        }
+        case "jmp":
+            ns.ip--;
+            ns.ip += ns.stack.pop() ?? 1;
+            break;
+        case "dup": {
+            let popped = ns.stack.pop();
+            if (typeof popped != "undefined") {
+                ns.stack.push(popped, popped);
+            }
+            break;
+        }
+        case "del":
+            ns.stack.pop();
+            break;
+        case "cmp": {
+            let [a, b] = [ns.stack.pop() ?? 0, ns.stack.pop() ?? 0];
+            // matter of taste
+            ns.stack.push(cmp(b, a));
+            break;
+        }
+        case "swp": {
+            let [a, b] = [ns.stack.pop(), ns.stack.pop()];
+            if (typeof a == "undefined" || typeof b == "undefined") {
                 break;
             }
+            ns.stack.push(a, b);
+            break;
         }
     }