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/*
This file is part of GNUnet
Copyright (C) 2014-2017 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
*/
/**
* @file json/json.c
* @brief functions to parse JSON snippets
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_json_lib.h"
/**
* Navigate and parse data in a JSON tree. Tries to parse the @a root
* to find all of the values given in the @a spec. If one of the
* entries in @a spec cannot be found or parsed, the name of the JSON
* field is returned in @a error_json_name, and the offset of the
* entry in @a spec is returned in @a error_line.
*
* @param root the JSON node to start the navigation at.
* @param spec parse specification array
* @param[out] error_json_name which JSON field was problematic
* @param[out] which index into @a spec did we encounter an error
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
GNUNET_JSON_parse (const json_t *root,
struct GNUNET_JSON_Specification *spec,
const char **error_json_name,
unsigned int *error_line)
{
unsigned int i;
json_t *pos;
if (NULL == root)
return GNUNET_SYSERR;
for (i=0;NULL != spec[i].parser;i++)
{
if (NULL == spec[i].field)
pos = (json_t *) root;
else
pos = json_object_get (root,
spec[i].field);
if ( (NULL == pos) ||
(GNUNET_OK !=
spec[i].parser (spec[i].cls,
pos,
&spec[i])) )
{
if (NULL != error_json_name)
*error_json_name = spec[i].field;
if (NULL != error_line)
*error_line = i;
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
}
return GNUNET_OK; /* all OK! */
}
/**
* Frees all elements allocated during a #GNUNET_JSON_parse()
* operation.
*
* @param spec specification of the parse operation
*/
void
GNUNET_JSON_parse_free (struct GNUNET_JSON_Specification *spec)
{
for (unsigned int i=0;NULL != spec[i].parser;i++)
if (NULL != spec[i].cleaner)
spec[i].cleaner (spec[i].cls,
&spec[i]);
}
/**
* Set an option with a JSON value from the command line.
* A pointer to this function should be passed as part of the
* 'struct GNUNET_GETOPT_CommandLineOption' array to initialize options
* of this type.
*
* @param ctx command line processing context
* @param scls additional closure (will point to the 'json_t *')
* @param option name of the option
* @param value actual value of the option as a string.
* @return #GNUNET_OK if parsing the value worked
*/
static int
set_json (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
void *scls,
const char *option,
const char *value)
{
json_t **json = scls;
json_error_t error;
*json = json_loads (value,
JSON_REJECT_DUPLICATES,
&error);
if (NULL == *json)
{
FPRINTF (stderr,
_("Failed to parse JSON in option `%s': %s (%s)\n"),
option,
error.text,
error.source);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Allow user to specify a JSON input value.
*
* @param shortName short name of the option
* @param name long name of the option
* @param argumentHelp help text for the option argument
* @param description long help text for the option
* @param[out] val set to the JSON specified at the command line
*/
struct GNUNET_GETOPT_CommandLineOption
GNUNET_JSON_getopt (char shortName,
const char *name,
const char *argumentHelp,
const char *description,
json_t **json)
{
struct GNUNET_GETOPT_CommandLineOption clo = {
.shortName = shortName,
.name = name,
.argumentHelp = argumentHelp,
.description = description,
.require_argument = 1,
.processor = &set_json,
.scls = (void *) json
};
return clo;
}
/* end of json.c */
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