Begin implementation of new environment

06/env.hpp

@@ -1,16 +1,31 @@
 #pragma once
-#include <map>
-#include "type.hpp"
+#include <memory>
+#include <string>
 
-struct type_env {
-    std::map<std::string, type_ptr> names;
-    type_env const* parent = nullptr;
+struct env {
+    virtual ~env() = default;
 
-    type_env(type_env const* p)
-        : parent(p) {}
-    type_env() : type_env(nullptr) {}
-
-    type_ptr lookup(const std::string& name) const;
-    void bind(const std::string& name, type_ptr t);
-    type_env scope() const;
+    virtual int get_offset(const std::string& name) const = 0;
+};
+
+using env_ptr = std::shared_ptr<env>;
+
+struct env_var {
+    std::string name;
+    env_ptr parent;
+
+    env_var(std::string& n, env_ptr p)
+        : name(std::move(n)), parent(std::move(p)) {}
+
+    virtual int get_offset(const std::string& name) const;
+};
+
+struct env_offset {
+    int offset;
+    env_ptr parent;
+
+    env_offset(int o, env_ptr p)
+        : offset(o), parent(std::move(p)) {}
+
+    virtual int get_offset(const std::string& name) const;
 };