Object.h

#ifndef JSON_PARSER_OBJECT_
#define JSON_PARSER_OBJECT_

#include <stdint.h>
#include <stdio.h>

#include "String.h"
#include "Array.h"

#include "types.h"

#define HASHMAP_INIT_SIZE 16

// Be careful while changing this.
// Indexing is based on the masking because of this being 2 
#define HASHMAP_M_FACTOR 2

#define REHASH_FACTOR 0.75f

struct Element {
    enum JSONType type;
    void *value;
};

struct KeyValuePair {
    String key;    
    struct Element element;
    size_t _stamp; // Insertion/updation order stamp
};

struct NodeKVP {
    struct KeyValuePair NODE; 
    struct NodeKVP* NEXT;
};

struct Object {
    struct NodeKVP** arr;
    size_t element_count, arr_size;
    size_t _count;

    // ITERATION fields
    struct KeyValuePair* _ordered;
    int32_t _iter; 
};

// To be used by user, "API"
struct Object create_object();
void delete_object(struct Object obj);

/*
 * WARNING:
 * This function has an amortized complexity of O(1).
 * It must not be used to partially iterate over hashmap.
 *
 * This function allows for a insertion(/updation) order traversal.
 */
struct KeyValuePair* next_element(struct Object* obj);

struct Object copy_object(struct Object obj);

struct KeyValuePair* get_kvp_for_key(struct Object* obj, String key);
enum JSONType get_type_for_key(struct Object* obj, String key);

void* get_value_for_key(struct Object* obj, String key);

// DO NOT USE THESE FUNCTIONS IF NOT SURE ABOUT THE TYPE
int get_int32_t_for_key(struct Object* obj, String key);
int64_t get_int64_t_for_key(struct Object* obj, String key);
double get_double_for_key(struct Object* obj, String key);
char get_char_for_key(struct Object* obj, String key);
String* get_string_for_key(struct Object* obj, String key);
struct Object* get_object_for_key(struct Object* obj, String key);
Array* get_array_for_key(struct Object* obj, String key);
bool get_bool_for_key(struct Object* obj, String key);

void set_value_for_key(struct Object* obj, String key, enum JSONType type, void* value);

void set_int32_t_for_key(struct Object* obj, String key, int x);
void set_int64_t_for_key(struct Object* obj, String key, int64_t x);
void set_double_for_key(struct Object* obj, String key, double x);
void set_char_for_key(struct Object* obj, String key, char x);
void set_string_for_key(struct Object* obj, String key, String x);
void set_object_for_key(struct Object* obj, String key, struct Object x);
void set_array_for_key(struct Object* obj, String key, Array x);
void set_bool_for_key(struct Object* obj, String key, bool x);
void set_null_for_key(struct Object* obj, String key);

void dump_json(FILE* fp, struct Element el, size_t indent);
struct Element load_json(FILE* fp);

#endif // JSON_PARSER_OBJECT_