Each statement class in separate file

src/Parser/Statement/Statement.h

@@ -0,0 +1,40 @@
+#ifndef STATEMENT_H
+#define STATEMENT_H
+
+#include <iostream>
+
+#include "Lexer/Token.h"
+#include "Parser/Expression.h"
+#include "Types.h"
+
+class Expression;
+class Statement;
+class StatementBlock;
+class StatementReturn;
+class StatementExpression;
+class StatementInvalid;
+
+using namespace std;
+
+enum class StatementKind {
+    FUNCTION_DECLARATION,
+    VAR_DECLARATION,
+    BLOCK,
+    RETURN,
+    EXPRESSION,
+    META_EXTERN_FUNCTION,
+    INVALID
+};
+
+class Statement {
+private:
+    StatementKind kind;
+
+public:
+    Statement(StatementKind kind);
+    StatementKind getKind();
+    bool isValid();
+    virtual string toString(int indent);
+};
+
+#endif