json_object_private.h

/*
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 * Copyright (c) 2015 Rainer Gerhards
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 */

#ifndef _fj_json_object_private_h_
#define _fj_json_object_private_h_

#include "atomic.h"

#ifdef __cplusplus
extern "C" {
#endif

/* define a couple of attributes to improve cross-platform builds */
#if __GNUC__ > 6
    #define ATTR_FALLTHROUGH __attribute__((fallthrough));
#else
    #define ATTR_FALLTHROUGH
#endif

#define LEN_DIRECT_STRING_DATA 32 /**< how many bytes are directly stored in fjson_object for strings? */

/**
 *  Type of the delete and serialization functions.
 */
typedef void (fjson_object_private_delete_fn)(struct fjson_object *o);
typedef int (fjson_object_to_json_string_fn)(struct fjson_object *jso,
                        struct printbuf *pb,
                        int level,
                        int flags);

struct _fjson_child {
    /**
     * The key.
     */
    const char *k;
    int k_is_constant;
    struct {
        unsigned k_is_constant : 1;
    } flags;
    /**
     * The value.
     */
    struct fjson_object *v;
};

struct _fjson_child_pg {
    struct _fjson_child children[FJSON_OBJECT_CHLD_PG_SIZE];
    struct _fjson_child_pg *next;
};

struct fjson_object
{
    enum fjson_type o_type;
    fjson_object_private_delete_fn *_delete;
    fjson_object_to_json_string_fn *_to_json_string;
    int _ref_count;
    struct printbuf *_pb;
    union data {
        fjson_bool c_boolean;
        struct {
            double value;
            char *source;
        } c_double;
        int64_t c_int64;
        struct {
            int nelem;
            int ndeleted;
            struct _fjson_child_pg pg;
            struct _fjson_child_pg *lastpg;
        } c_obj;
        struct array_list *c_array;
        struct {
            union {
            /* optimize: if we have small strings, we can store them
             * directly. This saves considerable CPU cycles AND memory.
             */
            char *ptr;
            char data[LEN_DIRECT_STRING_DATA];
            } str;
        int len;
        } c_string;
    } o;
    DEF_ATOMIC_HELPER_MUT(_mut_ref_count)
};

#ifdef __cplusplus
}
#endif

#endif