Implements variable usage, tweaks and fixes for variable assignment

src/Binder/BoundExpressions/BoundExpression.hpp

@@ -7,6 +7,7 @@
 #include <string>
 #include "../../ScriptType.hpp"
 #include "../BoundOperators.hpp"
+#include "../BoundVariables/BoundVariableKey.hpp"
 
 using namespace std;
 
@@ -17,6 +18,7 @@ enum class BoundExpressionKind{
     LiteralFloat,
     LiteralString,
     LiteralBool,
+    Variable,
 
     Unary,
     Binary,
@@ -129,6 +131,36 @@ public:
     }
 };
 
+class BoundVariableExpression : public BoundExpression{
+    int _scope;
+    int _id;
+    ScriptType _type;
+public:
+    BoundVariableExpression(int scope, int id, const ScriptType& type, unsigned int start, unsigned int length)
+            : BoundExpression(start, length, nullptr), _type(type){
+        _scope = scope;
+        _id = id;
+    }
+
+    ~BoundVariableExpression() override = default;
+
+    ScriptType* GetType() final{
+        return &_type;
+    };
+
+    BoundExpressionKind GetKind() final{
+        return BoundExpressionKind ::Variable;
+    }
+
+    int GetScope(){
+        return _scope;
+    }
+
+    int GetId(){
+        return _id;
+    }
+};
+
 class BoundBinaryExpression : public BoundExpression {
     BoundExpression* _left;
     BoundExpression* _right;