From e1d8a9727e1a84ddfa5b38e8f8a433b7105bc6bd Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 10 Jan 2016 20:10:54 +0000
Subject: Implements casts in the interpreter

---
 src/main/java/org/zwobble/couscous/interpreter/Evaluator.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/main/java/org/zwobble/couscous/interpreter/Evaluator.java')

diff --git a/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java b/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
index d90b78b..56ccca7 100644
--- a/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
+++ b/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
@@ -125,7 +125,11 @@ public class Evaluator implements ExpressionNodeMapper<InterpreterValue> {
 
     @Override
     public InterpreterValue visit(CastNode cast) {
-        throw new UnsupportedOperationException();
+        InterpreterValue value = eval(cast.getExpression());
+        if (!InterpreterTypes.isSubType(cast.getType(), value.getType())) {
+            throw new InvalidCast(cast.getType(), value.getType().getName());
+        }
+        return value;
     }
 
     private static boolean isIntegerBox(TypeCoercionNode typeCoercion) {
-- 
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