Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** This program 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

#include "jsonpath.h"

​

#include "zbxregexp.h"

#include "zbxvariant.h"

#include "zbxnum.h"

#include "zbxexpr.h"

#include "json.h"

#include "json_parser.h"

#include "jsonobj.h"

​

typedef struct

{

    zbx_jsonobj_t           *root;      /* the root object */

    zbx_jsonpath_t          *path;

    unsigned char           found;      /* set to 1 when one object was matched and */

                            /* no more matches are required             */

    zbx_vector_jsonobj_ref_t    objects;    /* the matched objects */

}

zbx_jsonpath_context_t;

​

typedef struct

{

    zbx_jsonpath_token_group_t  group;

    int             precedence;

}

zbx_jsonpath_token_def_t;

​

static int  jsonpath_query_object(zbx_jsonpath_context_t *ctx, zbx_jsonobj_t *obj, int path_depth);

static int  jsonpath_query_array(zbx_jsonpath_context_t *ctx, zbx_jsonobj_t *array, int path_depth);

static int  jsonpath_str_copy_value(char **str, size_t *str_alloc, size_t *str_offset, zbx_jsonobj_t *obj);

​

/* define token groups and precedence */

static zbx_jsonpath_token_def_t jsonpath_tokens[] = {

    {0, 0},

    {ZBX_JSONPATH_TOKEN_GROUP_OPERAND, 0},      /* ZBX_JSONPATH_TOKEN_PATH_ABSOLUTE */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERAND, 0},      /* ZBX_JSONPATH_TOKEN_PATH_RELATIVE */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERAND, 0},      /* ZBX_JSONPATH_TOKEN_CONST_STR */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERAND, 0},      /* ZBX_JSONPATH_TOKEN_CONST_NUM */

    {ZBX_JSONPATH_TOKEN_GROUP_NONE, 0},     /* ZBX_JSONPATH_TOKEN_PAREN_LEFT */

    {ZBX_JSONPATH_TOKEN_GROUP_NONE, 0},     /* ZBX_JSONPATH_TOKEN_PAREN_RIGHT */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERATOR2, 4},    /* ZBX_JSONPATH_TOKEN_OP_PLUS */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERATOR2, 4},    /* ZBX_JSONPATH_TOKEN_OP_MINUS */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERATOR2, 3},    /* ZBX_JSONPATH_TOKEN_OP_MULT */

    {ZBX_JSONPATH_TOKEN_GROUP_OPERATOR2, 3},    /* ZBX_JSONPATH_TOKEN_OP_DIV */