From e68b3036f7b68e84a7b3199e5c610253bbb55456 Mon Sep 17 00:00:00 2001
From: ctsk <9384305+ctsk@users.noreply.github.com>
Date: Tue, 11 Oct 2022 12:12:32 +0200
Subject: [PATCH] [jlox] Resolve superclasses

---
 jlox/lox/src/main/java/xyz/ctsk/lox/Resolver.java | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/jlox/lox/src/main/java/xyz/ctsk/lox/Resolver.java b/jlox/lox/src/main/java/xyz/ctsk/lox/Resolver.java
index b98fbeb..d38604e 100644
--- a/jlox/lox/src/main/java/xyz/ctsk/lox/Resolver.java
+++ b/jlox/lox/src/main/java/xyz/ctsk/lox/Resolver.java
@@ -1,10 +1,7 @@
 package xyz.ctsk.lox;
 
 
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Stack;
+import java.util.*;
 
 public class Resolver implements Expr.Visitor<Void>, Stmt.Visitor<Void> {
     private final Interpreter interpreter;
@@ -91,6 +88,14 @@ public class Resolver implements Expr.Visitor<Void>, Stmt.Visitor<Void> {
         currentClass = ClassType.CLASS;
         declare(stmt.name());
         define(stmt.name());
+
+        if (stmt.superclass() != null) {
+            if (stmt.name().lexeme().equals(stmt.superclass().name().lexeme())) {
+                Lox.error(stmt.superclass().name(), "A class can't inherit from itself.");
+            }
+            resolve(stmt.superclass());
+        }
+
         beginScope();
         scopes.peek().put("this", true);