value.h

#ifndef CLOX_VALUE_H
#define CLOX_VALUE_H

#include "common.h"

typedef struct Obj Obj;
typedef struct ObjString ObjString;

typedef enum {
    VAL_BOOL,
    VAL_NIL,
    VAL_NUMBER,
    VAL_OBJ,
} ValueType;

typedef struct {
    ValueType type;
    union {
        bool boolean;
        double number;
        Obj* obj;
    } as;
} Value;

#define IS_BOOL(value)      ((value).type == VAL_BOOL)
#define IS_NIL(value)       ((value).type == VAL_NIL)
#define IS_NUMBER(value)    ((value).type == VAL_NUMBER)
#define IS_OBJ(value)       ((value).type == VAL_OBJ)

#define AS_OBJ(value)       ((value).as.obj)
#define AS_BOOL(value)      ((value).as.boolean)
#define AS_NUMBER(value)    ((value).as.number)

#define BOOL_VAL(value)     ((Value) { VAL_BOOL, {.boolean = (value)} })
#define NIL_VAL             ((Value) { VAL_NIL, {.number = 0}})
#define NUMBER_VAL(value)   ((Value) { VAL_NUMBER, {.number = (value)}})
#define OBJ_VAL(object)     ((Value) { VAL_OBJ, {.obj = (Obj*)(object)}})

typedef struct {
    int capacity;
    int count;
    Value *values;
} ValueArray;

bool valuesEqual(Value a, Value b);
void initValueArray(ValueArray* valueArray);
void writeValueArray(ValueArray* valueArray, Value value);
void freeValueArray(ValueArray* valueArray);
void printValue(Value value);
#endif //CLOX_VALUE_H