From 30d2215800deafbdcfb134f1356777ec0139bb7a Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Thu, 1 Oct 2015 21:49:18 +0100
Subject: Use normal method call exec in interpreter entry point

---
 .../org/zwobble/couscous/interpreter/Executor.java | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 src/main/java/org/zwobble/couscous/interpreter/Executor.java

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

diff --git a/src/main/java/org/zwobble/couscous/interpreter/Executor.java b/src/main/java/org/zwobble/couscous/interpreter/Executor.java
new file mode 100644
index 0000000..633bf6b
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/Executor.java
@@ -0,0 +1,34 @@
+package org.zwobble.couscous.interpreter;
+
+import java.util.Optional;
+
+import org.zwobble.couscous.ast.ExpressionStatementNode;
+import org.zwobble.couscous.ast.ReturnNode;
+import org.zwobble.couscous.ast.StatementNode;
+import org.zwobble.couscous.ast.visitors.StatementNodeVisitor;
+import org.zwobble.couscous.values.InterpreterValue;
+
+import static org.zwobble.couscous.interpreter.Evaluator.eval;
+
+public class Executor implements StatementNodeVisitor<Optional<InterpreterValue>> {
+    public static Optional<InterpreterValue> exec(Environment environment, StatementNode statement) {
+        return statement.accept(new Executor(environment));
+    }
+    
+    private final Environment environment;
+
+    private Executor(Environment environment) {
+        this.environment = environment;
+    }
+    
+    @Override
+    public Optional<InterpreterValue> visit(ReturnNode returnNode) {
+        return Optional.of(eval(environment, returnNode.getValue()));
+    }
+
+    @Override
+    public Optional<InterpreterValue> visit(ExpressionStatementNode expressionStatement) {
+        eval(environment, expressionStatement.getExpression());
+        return Optional.empty();
+    }
+}
-- 
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