#pragma once

#define TYPE(x) ((x).type)

#define CONS(x) ((x).value.consCell)
#define CAR(x) (((x).value.consCell)->car)
#define CDR(x) (((x).value.consCell)->cdr)
#define NUM(x) ((x).value.number)
#define SYM(x) ((x).value.symbol)
#define ERR(x) ((x).value.err)

typedef enum
{
	nilObject,
	consObject,
	numberObject,
	symbolObject,
	errorObject
} dataType;

typedef enum
{
	improperListError,
	typeError,
	unrecognizedSymbolError,
	notApplicableError,
	divisionByZeroError,
	argumentNumberError,
	syntaxError
} error;

typedef struct object object;
typedef struct cons cons;

struct object
{
	dataType type;
	union
	{
		error err;
		char *symbol;
		long long int number;
		cons *consCell;
	} value;
};

struct cons
{
	object car;
	object cdr;
};

int properList(object list);
int listLength(object list);
void deleteObject(object input);
object copyObject(object input);