From bb4720feac00710c499acf61b98c8da4d4351d1e Mon Sep 17 00:00:00 2001
From: LeonardoBizzoni <leo2002714@gmail.com>
Date: Sun, 29 Oct 2023 18:17:31 +0100
Subject: [PATCH] Forgot to interpret "this" expresions

---
 lib/expressions.h   | 9 +++++++--
 src/interpreter.cpp | 2 +-
 src/parser.cpp      | 2 +-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/expressions.h b/lib/expressions.h
index 3b7f324..81fa7ee 100755
--- a/lib/expressions.h
+++ b/lib/expressions.h
@@ -2,6 +2,7 @@
 #define EXPRESSIONS_H
 
 #include "common.h"
+#include "token.h"
 #include "visitor.h"
 
 #include <cstdint>
@@ -95,8 +96,12 @@ struct SuperExpr : public Expr {
 };
 
 struct ThisExpr : public Expr {
-  ThisExpr(int line, int column, const std::string &file)
-      : Expr(line, column, file) {}
+public:
+  std::shared_ptr<const Token> keyword;
+
+  ThisExpr(int line, int column, const std::string &file, std::shared_ptr<const Token>& keyword)
+      : keyword(keyword), Expr(line, column, file) {}
+
   LBPLType accept(Expression::Visitor *visitor) {
     return visitor->visitThisExpr(this);
   }
diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index ff68f4a..58fc6b2 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -185,7 +185,7 @@ LBPLType Interpreter::visitGroupExpr(GroupingExpr *expr) {
 }
 
 LBPLType Interpreter::visitSuperExpr(SuperExpr *) { return nullptr; }
-LBPLType Interpreter::visitThisExpr(ThisExpr *) { return nullptr; }
+LBPLType Interpreter::visitThisExpr(ThisExpr *expr) { return lookupVariable(expr->keyword, expr); }
 
 LBPLType Interpreter::visitCallExpr(FnCallExpr *expr) {
   LBPLType callee = expr->callee->accept(this);
diff --git a/src/parser.cpp b/src/parser.cpp
index d94e9e6..83a80de 100755
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -455,7 +455,7 @@ std::unique_ptr<Expr> Parser::primary() {
 
     return std::make_unique<SuperExpr>(line, col, lexer->getFilename(), field);
   } else if (match(TokenType::This)) {
-    return std::make_unique<ThisExpr>(line, col, lexer->getFilename());
+    return std::make_unique<ThisExpr>(line, col, lexer->getFilename(), previous);
   } else if (match(TokenType::Identifier)) {
     return std::make_unique<VariableExpr>(line, col, lexer->getFilename(),
                                           previous);
-- 
2.52.0