From 80394e184274eb8ec3ce03cd901e5c817ec82e2a Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Mon, 18 Jan 2021 17:42:02 -0800
Subject: Add break statement

---
 src/com/craftinginterpreters/lox/Interpreter.java | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'src/com/craftinginterpreters/lox/Interpreter.java')

diff --git a/src/com/craftinginterpreters/lox/Interpreter.java b/src/com/craftinginterpreters/lox/Interpreter.java
index 9d0cfb3..22c8d4a 100644
--- a/src/com/craftinginterpreters/lox/Interpreter.java
+++ b/src/com/craftinginterpreters/lox/Interpreter.java
@@ -161,13 +161,22 @@ class Interpreter implements Expr.Visitor<Object>, Stmt.Visitor<Void> {
 
     @Override
     public Void visitWhileStmt(Stmt.While stmt) {
-        while (isTruthy(evaluate(stmt.condition))) {
-            execute(stmt.body);
+        try {
+            while (isTruthy(evaluate(stmt.condition))) {
+                execute(stmt.body);
+            }
+        } catch (Break ex) {
+            // We continue on.
         }
 
         return null;
     }
 
+    @Override
+    public Void visitBreakStmt(Stmt.Break stmt) {
+        throw new Break();
+    }
+
     @Override
     public Object visitAssignExpr(Expr.Assign expr) {
         Object value = evaluate(expr.value);
-- 
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