#ifndef EXPRESSION_H
#define EXPRESSION_H

#include <stdbool.h>

typedef enum {
	OPERATOR_ADD = 0,
	OPERATOR_SUBTRACT = 1,
	OPERATOR_MULTIPLY = 2,
	OPERATOR_DIVIDE = 3,
} operator_t;

struct _expression_t;
typedef struct {
	operator_t operator;
	const struct _expression_t *operands[2];
} application_t;

typedef struct _expression_t {
	bool is_number;
	union {
		application_t application;
		int number;
	};
} expression_t;

#endif