From a6447679032d997d861f4f397ae3e21806726739 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 29 Sep 2015 20:19:28 +0100
Subject: Move Evaluator to its own class

---
 .../zwobble/couscous/interpreter/Evaluator.java    | 41 ++++++++++++++++++++++
 .../zwobble/couscous/interpreter/Interpreter.java  | 34 ------------------
 2 files changed, 41 insertions(+), 34 deletions(-)
 create mode 100644 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
new file mode 100644
index 0000000..033bfb8
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
@@ -0,0 +1,41 @@
+package org.zwobble.couscous.interpreter;
+
+import java.util.Map;
+
+import org.zwobble.couscous.ast.Assignment;
+import org.zwobble.couscous.ast.ExpressionNode;
+import org.zwobble.couscous.ast.LiteralNode;
+import org.zwobble.couscous.ast.VariableReferenceNode;
+import org.zwobble.couscous.ast.visitors.ExpressionNodeVisitor;
+import org.zwobble.couscous.values.InterpreterValue;
+
+import lombok.val;
+
+public class Evaluator implements ExpressionNodeVisitor<InterpreterValue> {
+    private final Map<Integer, InterpreterValue> stackFrame;
+
+    public Evaluator(Map<Integer, InterpreterValue> stackFrame) {
+        this.stackFrame = stackFrame;
+    }
+    
+    public InterpreterValue eval(ExpressionNode expression) {
+        return expression.accept(this);
+    }
+
+    @Override
+    public InterpreterValue visit(LiteralNode literal) {
+        return literal.getValue();
+    }
+
+    @Override
+    public InterpreterValue visit(VariableReferenceNode variableReference) {
+        return stackFrame.get(variableReference.getReferentId());
+    }
+
+    @Override
+    public InterpreterValue visit(Assignment assignment) {
+        val value = eval(assignment.getValue());
+        stackFrame.put(assignment.getTarget().getReferentId(), value);
+        return value;
+    }
+}
diff --git a/src/main/java/org/zwobble/couscous/interpreter/Interpreter.java b/src/main/java/org/zwobble/couscous/interpreter/Interpreter.java
index 49c651b..8bf6479 100644
--- a/src/main/java/org/zwobble/couscous/interpreter/Interpreter.java
+++ b/src/main/java/org/zwobble/couscous/interpreter/Interpreter.java
@@ -6,14 +6,9 @@ import java.util.Optional;
 import java.util.stream.IntStream;
 
 import org.zwobble.couscous.Project;
-import org.zwobble.couscous.ast.Assignment;
-import org.zwobble.couscous.ast.ExpressionNode;
 import org.zwobble.couscous.ast.ExpressionStatementNode;
-import org.zwobble.couscous.ast.LiteralNode;
 import org.zwobble.couscous.ast.MethodNode;
 import org.zwobble.couscous.ast.ReturnNode;
-import org.zwobble.couscous.ast.VariableReferenceNode;
-import org.zwobble.couscous.ast.visitors.ExpressionNodeVisitor;
 import org.zwobble.couscous.ast.visitors.StatementNodeVisitor;
 import org.zwobble.couscous.values.InterpreterValue;
 
@@ -78,33 +73,4 @@ public class Interpreter {
             return Optional.empty();
         }
     }
-    
-    private class Evaluator implements ExpressionNodeVisitor<InterpreterValue> {
-        private final Map<Integer, InterpreterValue> stackFrame;
-
-        public Evaluator(Map<Integer, InterpreterValue> stackFrame) {
-            this.stackFrame = stackFrame;
-        }
-        
-        public InterpreterValue eval(ExpressionNode expression) {
-            return expression.accept(this);
-        }
-
-        @Override
-        public InterpreterValue visit(LiteralNode literal) {
-            return literal.getValue();
-        }
-
-        @Override
-        public InterpreterValue visit(VariableReferenceNode variableReference) {
-            return stackFrame.get(variableReference.getReferentId());
-        }
-
-        @Override
-        public InterpreterValue visit(Assignment assignment) {
-            val value = eval(assignment.getValue());
-            stackFrame.put(assignment.getTarget().getReferentId(), value);
-            return value;
-        }
-    }
 }
-- 
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