#ifndef EXPRESSION_H
#define EXPRESSION_H

#include "scanner.h"

typedef enum {
    EXPRESSION,
    LITERAL,
    GROUPING,
    UNARY,
    BINARY,
    OPERATOR
} ExpressionType;

typedef struct Expr Expr;

struct binary {
    struct Expr* left;
    Token* op;
    struct Expr* right;
};

struct grouping {
    struct Expr* expression;
};

struct literal {
    Token* type;
    void* object;
};

struct unary {
    Token* op;
    struct Expr* right;
};

struct Expr {
    ExpressionType type;
    union ex {
        struct binary Binary;
        struct grouping Grouping;
        struct literal Literal;
        struct unary Unary;
    } expression;
};

void VisitBinary(struct binary);
void VisitGrouping(struct grouping);
void VisitLiteral(struct literal);
void VisitUnary(struct unary);

#endif