1 files changed, 19 insertions, 16 deletions
diff --git a/src/interpreter/interpreter.ts b/src/interpreter/interpreter.ts
index 0b3ae34..4599c46 100644
--- a/src/interpreter/interpreter.ts
+++ b/src/interpreter/interpreter.ts
@@ -198,22 +198,6 @@ export const betaReduce = (
   );
 };
 
-export const interpret = (term: string): DebrujinifiedLambdaTerm => {
-  const ast = parse(term);
-  const symbolTable = new SymbolTable();
-  const debrujined = debrujinify(ast, symbolTable);
-
-  let prev = debrujined;
-  let next = betaReduce(prev);
-
-  while (emitDebrujin(prev) !== emitDebrujin(next)) {
-    // alpha equivalence
-    prev = next;
-    next = betaReduce(prev);
-  }
-  return next;
-};
-
 export const emitDebrujin = (term: DebrujinifiedLambdaTerm): string => {
   if ("index" in term) {
     return term.index.toString();
@@ -253,3 +237,22 @@ export const emitNamed = (term: DebrujinifiedLambdaTerm): string => {
 
   throw new InvalidLambdaTermError(`Invalid lambda term: ${term}`);
 };
+
+export const interpret = (
+  term: string,
+  symbolTable = new SymbolTable(),
+  allowUnderscores = false,
+): DebrujinifiedLambdaTerm => {
+  const ast = parse(term, allowUnderscores);
+  const debrujined = debrujinify(ast, symbolTable);
+
+  let prev = debrujined;
+  let next = betaReduce(prev);
+
+  while (emitDebrujin(prev) !== emitDebrujin(next)) {
+    // alpha equivalence
+    prev = next;
+    next = betaReduce(prev);
+  }
+  return next;
+};