From 6d02b3e3e6f8da9837a46efda4733bdd89e38aaf Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Thu, 11 Feb 2016 21:04:34 +0000
Subject: Introduce ReceiverValue into interpreter

---
 .../org/zwobble/couscous/interpreter/Evaluator.java  | 18 ++++++++++--------
 .../interpreter/values/InstanceReceiverValue.java    | 20 ++++++++++++++++++++
 .../couscous/interpreter/values/ReceiverValue.java   | 10 ++++++++++
 .../interpreter/values/StaticReceiverValue.java      | 19 +++++++++++++++++++
 4 files changed, 59 insertions(+), 8 deletions(-)
 create mode 100644 src/main/java/org/zwobble/couscous/interpreter/values/InstanceReceiverValue.java
 create mode 100644 src/main/java/org/zwobble/couscous/interpreter/values/ReceiverValue.java
 create mode 100644 src/main/java/org/zwobble/couscous/interpreter/values/StaticReceiverValue.java

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java b/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
index 68469fd..6c40960 100644
--- a/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
+++ b/src/main/java/org/zwobble/couscous/interpreter/Evaluator.java
@@ -88,18 +88,20 @@ public class Evaluator implements ExpressionNodeMapper<InterpreterValue> {
         List<InterpreterValue> arguments = evalArguments(methodCall.getArguments());
         MethodSignature signature = methodCall.signature();
 
-        return methodCall.getReceiver().accept(new Receiver.Mapper<InterpreterValue>() {
+        return evalReceiver(methodCall.getReceiver())
+            .callMethod(environment, signature, arguments);
+    }
+
+    private ReceiverValue evalReceiver(Receiver receiver) {
+        return receiver.accept(new Receiver.Mapper<ReceiverValue>() {
             @Override
-            public InterpreterValue visit(ExpressionNode receiverExpression) {
-                InterpreterValue receiver = eval(receiverExpression);
-                ConcreteType type = receiver.getType();
-                return type.callMethod(environment, receiver, signature, arguments);
+            public ReceiverValue visit(ExpressionNode receiver) {
+                return new InstanceReceiverValue(eval(receiver));
             }
 
             @Override
-            public InterpreterValue visit(TypeName receiver) {
-                ConcreteType clazz = environment.findClass(receiver);
-                return clazz.callStaticMethod(environment, signature, arguments);
+            public ReceiverValue visit(TypeName receiver) {
+                return new StaticReceiverValue(environment.findClass(receiver));
             }
         });
     }
diff --git a/src/main/java/org/zwobble/couscous/interpreter/values/InstanceReceiverValue.java b/src/main/java/org/zwobble/couscous/interpreter/values/InstanceReceiverValue.java
new file mode 100644
index 0000000..3c3d932
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/values/InstanceReceiverValue.java
@@ -0,0 +1,20 @@
+package org.zwobble.couscous.interpreter.values;
+
+import org.zwobble.couscous.ast.MethodSignature;
+import org.zwobble.couscous.interpreter.Environment;
+
+import java.util.List;
+
+public class InstanceReceiverValue implements ReceiverValue {
+    private final InterpreterValue value;
+
+    public InstanceReceiverValue(InterpreterValue value) {
+        this.value = value;
+    }
+
+    @Override
+    public InterpreterValue callMethod(Environment environment, MethodSignature signature, List<InterpreterValue> arguments) {
+        ConcreteType type = value.getType();
+        return type.callMethod(environment, value, signature, arguments);
+    }
+}
diff --git a/src/main/java/org/zwobble/couscous/interpreter/values/ReceiverValue.java b/src/main/java/org/zwobble/couscous/interpreter/values/ReceiverValue.java
new file mode 100644
index 0000000..5b24f95
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/values/ReceiverValue.java
@@ -0,0 +1,10 @@
+package org.zwobble.couscous.interpreter.values;
+
+import org.zwobble.couscous.ast.MethodSignature;
+import org.zwobble.couscous.interpreter.Environment;
+
+import java.util.List;
+
+public interface ReceiverValue {
+    InterpreterValue callMethod(Environment environment, MethodSignature signature, List<InterpreterValue> arguments);
+}
diff --git a/src/main/java/org/zwobble/couscous/interpreter/values/StaticReceiverValue.java b/src/main/java/org/zwobble/couscous/interpreter/values/StaticReceiverValue.java
new file mode 100644
index 0000000..f7ce1f6
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/values/StaticReceiverValue.java
@@ -0,0 +1,19 @@
+package org.zwobble.couscous.interpreter.values;
+
+import org.zwobble.couscous.ast.MethodSignature;
+import org.zwobble.couscous.interpreter.Environment;
+
+import java.util.List;
+
+public class StaticReceiverValue implements ReceiverValue {
+    private final ConcreteType type;
+
+    public StaticReceiverValue(ConcreteType type) {
+        this.type = type;
+    }
+
+    @Override
+    public InterpreterValue callMethod(Environment environment, MethodSignature signature, List<InterpreterValue> arguments) {
+        return type.callStaticMethod(environment, signature, arguments);
+    }
+}
-- 
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