#ifndef SYNTAX_H
#define SYNTAX_H

typedef float num_t;
typedef char* atom_t;
typedef char* string_t;
typedef struct expr_t expr_t;
typedef struct binop_t binop_t;

struct expr_t {
  int type;
  union {
    atom_t id;
    num_t num;
    string_t string;
    binop_t *binop;
  };
};

struct binop_t {
  expr_t *first;
  expr_t *second;
  int op;
};

#endif /* SYNTAX_H */