Implement static constructor and fields in interpreter

1 files changed, 36 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/couscous/interpreter/values/InterpreterFields.java b/src/main/java/org/zwobble/couscous/interpreter/values/InterpreterFields.java
new file mode 100644
index 0000000..fc082a5
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/values/InterpreterFields.java
@@ -0,0 +1,36 @@
+package org.zwobble.couscous.interpreter.values;
+
+import org.zwobble.couscous.interpreter.InterpreterTypes;
+import org.zwobble.couscous.interpreter.errors.NoSuchField;
+import org.zwobble.couscous.interpreter.errors.UnboundField;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class InterpreterFields {
+    // TODO: distinguish static and non-static fields
+
+    private final ConcreteType type;
+    private final Map<String, InterpreterValue> fields;
+
+    public InterpreterFields(ConcreteType type) {
+        this.type = type;
+        this.fields = new HashMap<>();
+    }
+
+    public InterpreterValue getField(String fieldName) {
+        type.getField(fieldName).orElseThrow(() -> new NoSuchField(fieldName));
+        if (fields.containsKey(fieldName)) {
+            return fields.get(fieldName);
+        } else {
+            throw new UnboundField(fieldName);
+        }
+    }
+
+    public void setField(String fieldName, InterpreterValue value) {
+        FieldValue field = type.getField(fieldName)
+            .orElseThrow(() -> new NoSuchField(fieldName));
+        InterpreterTypes.checkIsInstance(field.getType(), value);
+        fields.put(fieldName, value);
+    }
+}