Properly clear up memory of parsed results

src/Parser/ParsedExpressions/ParsedExpression.hpp

@@ -23,12 +23,13 @@ class ParsedExpression {
     unsigned int _position;
     unsigned int _length;
 public:
-    virtual ParsedExpressionKind GetKind() = 0;
-
     ParsedExpression(unsigned int position, unsigned int length){
         _position = position;
         _length = length;
     }
+    virtual ~ParsedExpression() = default;
+
+    virtual ParsedExpressionKind GetKind() = 0;
 
     unsigned int GetStartPosition(){
         return _position;
@@ -100,6 +101,10 @@ public:
 class ParenthesizedExpression : public ParsedExpression{
     ParsedExpression* _expression;
 public:
+    ~ParenthesizedExpression() override {
+        delete _expression;
+    }
+
     ParsedExpressionKind GetKind() final{
         return ParsedExpressionKind::Parenthesized;
     }
@@ -118,6 +123,10 @@ class UnaryExpression : public ParsedExpression{
     UnaryOperatorKind _kind;
     ParsedExpression* _operand;
 public:
+    ~UnaryExpression() override {
+        delete _operand;
+    }
+
     ParsedExpressionKind GetKind() final{
         return ParsedExpressionKind::Unary;
     }
@@ -142,6 +151,11 @@ class BinaryExpression : public ParsedExpression{
     ParsedExpression* _left;
     ParsedExpression* _right;
 public:
+    ~BinaryExpression() override {
+        delete _left;
+        delete _right;
+    }
+
     ParsedExpressionKind GetKind() final{
         return ParsedExpressionKind::Binary;
     }