Split expressions into separate files

src/Parser/Expression/Expression.h

@@ -0,0 +1,37 @@
+#ifndef EXPRESSION_H
+#define EXPRESSION_H
+
+#include <iostream>
+
+#include "Lexer/Token.h"
+#include "Types.h"
+
+using namespace std;
+
+enum class ExpressionKind {
+    LITERAL,
+    GROUPING,
+    BINARY,
+    IF_ELSE,
+    VAR,
+    CALL,
+    BLOCK,
+    INVALID
+};
+
+class Expression {
+private:
+    ExpressionKind kind;
+
+protected:
+    ValueType valueType;
+
+public:
+    Expression(ExpressionKind kind, ValueType valueType);
+    ExpressionKind getKind();
+    ValueType getValueType();
+    bool isValid();
+    virtual string toString(int indent);
+};
+
+#endif