src/basic/json.h

#pragma once

/***
  This file is part of systemd.

  Copyright 2014 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#include "macro.h"
#include "util.h"

enum {
        JSON_END,
        JSON_COLON,
        JSON_COMMA,
        JSON_OBJECT_OPEN,
        JSON_OBJECT_CLOSE,
        JSON_ARRAY_OPEN,
        JSON_ARRAY_CLOSE,
        JSON_STRING,
        JSON_REAL,
        JSON_INTEGER,
        JSON_BOOLEAN,
        JSON_NULL,
};

typedef enum {
        JSON_VARIANT_CONTROL,
        JSON_VARIANT_STRING,
        JSON_VARIANT_INTEGER,
        JSON_VARIANT_BOOLEAN,
        JSON_VARIANT_REAL,
        JSON_VARIANT_ARRAY,
        JSON_VARIANT_OBJECT,
        JSON_VARIANT_NULL
} JsonVariantType;

union json_value {
        bool boolean;
        double real;
        intmax_t integer;
};

typedef struct JsonVariant {
        JsonVariantType type;
        size_t size;
        union {
                char *string;
                struct JsonVariant *objects;
                union json_value value;
        };
} JsonVariant;

int json_variant_new(JsonVariant **ret, JsonVariantType type);
JsonVariant *json_variant_unref(JsonVariant *v);

DEFINE_TRIVIAL_CLEANUP_FUNC(JsonVariant *, json_variant_unref);
#define _cleanup_json_variant_unref_ _cleanup_(json_variant_unrefp)

char *json_variant_string(JsonVariant *v);
bool json_variant_bool(JsonVariant *v);
intmax_t json_variant_integer(JsonVariant *v);
double json_variant_real(JsonVariant *v);

JsonVariant *json_variant_element(JsonVariant *v, unsigned index);
JsonVariant *json_variant_value(JsonVariant *v, const char *key);

#define JSON_VALUE_NULL ((union json_value) {})

int json_tokenize(const char **p, char **ret_string, union json_value *ret_value, void **state, unsigned *line);

int json_parse(const char *string, JsonVariant **rv);
int json_parse_measure(const char *string, size_t *size);