value.h

//
// Created by kroot on 17/7/19.
//

#ifndef CLOX_VALUE_H
#define CLOX_VALUE_H

#include "common.h"

typedef struct sObj Obj;
typedef struct sObjString 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_BOOL(value)    ((value).as.boolean)
#define AS_NUMBER(value)  ((value).as.number)
#define AS_OBJ(value)     ((value).as.obj)

#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* array);

void writeValueArray(ValueArray* array, Value value);

void freeValueArray(ValueArray* array);

void printValue(Value value);

#endif //CLOX_VALUE_H