clox/value.h

/**
  ******************************************************************************
  * @file           : value.h
  * @author         : simon
  * @brief          : 常量 support only double-precision, floating-point numbers
  * @attention      : None
  * @date           : 2023/8/16
  ******************************************************************************
  */

#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,/// heap-allocated types: strings, instances, functions
} 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}})

/// \brief 常量池
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_