/*
** mruby/array.h - Array class
**
** See Copyright Notice in mruby.h
*/

#ifndef MRUBY_ARRAY_H
#define MRUBY_ARRAY_H

#include "common.h"

/*
 * Array class
 */
MRB_BEGIN_DECL


typedef struct mrb_shared_array {
  int refcnt;
  mrb_int len;
  mrb_value *ptr;
} mrb_shared_array;

struct RArray {
  MRB_OBJECT_HEADER;
  mrb_int len;
  union {
    mrb_int capa;
    mrb_shared_array *shared;
  } aux;
  mrb_value *ptr;
};

#define mrb_ary_ptr(v)    ((struct RArray*)(mrb_ptr(v)))
#define mrb_ary_value(p)  mrb_obj_value((void*)(p))
#define RARRAY(v)  ((struct RArray*)(mrb_ptr(v)))

#define RARRAY_LEN(a) (RARRAY(a)->len)
#define RARRAY_PTR(a) ((const mrb_value*)RARRAY(a)->ptr)
#define MRB_ARY_SHARED      256
#define ARY_SHARED_P(a) ((a)->flags & MRB_ARY_SHARED)
#define ARY_SET_SHARED_FLAG(a) ((a)->flags |= MRB_ARY_SHARED)
#define ARY_UNSET_SHARED_FLAG(a) ((a)->flags &= ~MRB_ARY_SHARED)

void mrb_ary_decref(mrb_state*, mrb_shared_array*);
MRB_API void mrb_ary_modify(mrb_state*, struct RArray*);
MRB_API mrb_value mrb_ary_new_capa(mrb_state*, mrb_int);

/*
 * Initializes a new array.
 *
 * Equivalent to:
 *
 *      Array.new
 *
 * @param mrb The mruby state reference.
 * @return The initialized array
 */
MRB_API mrb_value mrb_ary_new(mrb_state *mrb);

MRB_API mrb_value mrb_ary_new_from_values(mrb_state *mrb, mrb_int size, const mrb_value *vals);
MRB_API mrb_value mrb_assoc_new(mrb_state *mrb, mrb_value car, mrb_value cdr);
MRB_API void mrb_ary_concat(mrb_state*, mrb_value, mrb_value);
MRB_API mrb_value mrb_ary_splat(mrb_state*, mrb_value);

/*
 * Pushes value into array.
 *
 * Equivalent to:
 *
 *      ary