Implement if statements in interpreter

2 files changed, 12 insertions, 1 deletions

diff --git a/src/main/java/org/zwobble/couscous/interpreter/Executor.java b/src/main/java/org/zwobble/couscous/interpreter/Executor.java
index 9e34c42..84665a1 100644
--- a/src/main/java/org/zwobble/couscous/interpreter/Executor.java
+++ b/src/main/java/org/zwobble/couscous/interpreter/Executor.java
@@ -96,8 +96,9 @@ public class Executor implements StatementNodeMapper<Optional<InterpreterValue>>
         BooleanInterpreterValue condition = (BooleanInterpreterValue) eval(environment, ifStatement.getCondition());
         if (condition.getValue()) {
             return exec(ifStatement.getTrueBranch());
+        } else {
+            return exec(ifStatement.getFalseBranch());
         }
-        return Optional.empty();
     }
 
     @Override
diff --git a/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java b/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
index f77140b..758832f 100644
--- a/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
@@ -96,6 +96,16 @@ public abstract class BackendMethodTests {
                 asList(returns(literal("[false]")))));
         assertEquals(value("[true]"), runMethod(method));
     }
+
+    @Test
+    public void whenConditionIsFalseIfStatementExecutesTrueBranch() {
+        MethodNode.Builder method = staticMethod("hello")
+            .statement(ifStatement(
+                literal(false),
+                asList(returns(literal("[true]"))),
+                asList(returns(literal("[false]")))));
+        assertEquals(value("[false]"), runMethod(method));
+    }
     
     protected PrimitiveValue runMethod(MethodNode.Builder methodBuilder, PrimitiveValue... arguments) {
         MethodNode method = methodBuilder.build();