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/*
* json_plist.c
* JSON/property list functions
*
* Copyright (c) 2013 Nikias Bassen. All Rights Reserved.
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jsmn.h>
#include <plist/plist.h>
#include "json_plist.h"
static plist_t parse_primitive(const char* js, jsmntok_t* tokens, int* index);
static plist_t parse_string(const char* js, jsmntok_t* tokens, int* index);
static plist_t parse_array(const char* js, jsmntok_t* tokens, int* index);
static plist_t parse_object(const char* js, jsmntok_t* tokens, int* index);
static char* get_string_value(const char* js, jsmntok_t token)
{
int len = (token.end - token.start);
char* str = malloc(len+1);
memcpy(str, js + token.start, len);
str[len] = 0;
return str;
}
static plist_t parse_primitive(const char* js, jsmntok_t* tokens, int* index)
{
if (tokens[*index].type != JSMN_PRIMITIVE) {
fprintf(stderr, "%s: ERROR: token type != JSMN_PRIMITIVE?!\n", __func__);
return NULL;
}
plist_t val = NULL;
char* strval = get_string_value(js, tokens[*index]);
if (strval[0] == 'f') {
val = plist_new_bool(0);
} else if (strval[0] == 't') {
val = plist_new_bool(1);
} else if ((strval[0] == '-') || ((strval[0] >= '0') && (strval[0] <= '9'))) {
val = plist_new_uint(strtoll(strval, NULL, 10));
} else {
fprintf(stderr, "%s: WARNING: invalid primitive value '%s' encountered, will return as string\n", __func__, strval);
val = plist_new_string(strval);
}
free(strval);
(*index)++;
return val;
}
static plist_t parse_string(const char* js, jsmntok_t* tokens, int* index)
{
if (tokens[*index].type != JSMN_STRING) {
fprintf(stderr, "%s: ERROR: token type != JSMN_STRING?!\n", __func__);
return NULL;
}
char* str = get_string_value(js, tokens[*index]);
plist_t val = plist_new_string(str);
free(str);
(*index)++;
return val;
}
static plist_t parse_array(const char* js, jsmntok_t* tokens, int* index)
{
if (tokens[*index].type != JSMN_ARRAY) {
fprintf(stderr, "%s: ERROR: token type != JSMN_ARRAY?!\n", __func__);
return NULL;
}
plist_t arr = plist_new_array();
int num_tokens = tokens[*index].size;
int num;
int j = (*index)+1;
for (num = 0; num < num_tokens; num++) {
plist_t val = NULL;
switch (tokens[j].type) {
case JSMN_OBJECT:
val = parse_object(js, tokens, &j);
break;
case JSMN_ARRAY:
val = parse_array(js, tokens, &j);
break;
case JSMN_STRING:
val = parse_string(js, tokens, &j);
break;
case JSMN_PRIMITIVE:
val = parse_primitive(js, tokens, &j);
break;
default:
break;
}
if (val) {
plist_array_append_item(arr, val);
}
}
*(index) = j;
return arr;
}
static plist_t parse_object(const char* js, jsmntok_t* tokens, int* index)
{
if (tokens[*index].type != JSMN_OBJECT) {
fprintf(stderr, "%s: ERROR: token type != JSMN_OBJECT?!\n", __func__);
return NULL;
}
plist_t obj = plist_new_dict();
int num_tokens = tokens[*index].size;
int num;
int j = (*index)+1;
for (num = 0; num < num_tokens; num++) {
if (tokens[j].type == JSMN_STRING) {
char* key = get_string_value(js, tokens[j]);
plist_t val = NULL;
j++;
num++;
switch (tokens[j].type) {
case JSMN_OBJECT:
val = parse_object(js, tokens, &j);
break;
case JSMN_ARRAY:
val = parse_array(js, tokens, &j);
break;
case JSMN_STRING:
val = parse_string(js, tokens, &j);
break;
case JSMN_PRIMITIVE:
val = parse_primitive(js, tokens, &j);
break;
default:
break;
}
if (val) {
plist_dict_set_item(obj, key, val);
}
free(key);
} else {
fprintf(stderr, "%s: keys must be of type STRING\n", __func__);
return NULL;
}
}
(*index) = j;
return obj;
}
plist_t json_to_plist(const char* json_string)
{
jsmn_parser parser;
jsmn_init(&parser);
int maxtoks = 256;
jsmntok_t *tokens;
if (!json_string) {
fprintf(stderr, "%s: ERROR: no JSON string given.\n", __func__);
return NULL;
}
tokens = malloc(sizeof(jsmntok_t)*maxtoks);
if (!tokens) {
fprintf(stderr, "%s: Out of memory\n", __func__);
return NULL;
}
int r = 0;
reparse:
r = jsmn_parse(&parser, json_string, tokens, maxtoks);
if (r == JSMN_ERROR_NOMEM) {
//printf("not enough tokens (%d), retrying...\n", maxtoks);
maxtoks+=256;
jsmntok_t* newtokens = realloc(tokens, sizeof(jsmntok_t)*maxtoks);
if (newtokens) {
tokens = newtokens;
goto reparse;
}
}
switch(r) {
case JSMN_ERROR_NOMEM:
fprintf(stderr, "%s: ERROR: Out of memory...\n", __func__);
return NULL;
case JSMN_ERROR_INVAL:
fprintf(stderr, "%s: ERROR: Invalid character inside JSON string\n", __func__);
return NULL;
case JSMN_ERROR_PART:
fprintf(stderr, "%s: ERROR: The string is not a full JSON packet, more bytes expected\n", __func__);
return NULL;
default:
break;
}
int startindex = 0;
plist_t plist = NULL;
switch (tokens[startindex].type) {
case JSMN_PRIMITIVE:
plist = parse_primitive(json_string, tokens, &startindex);
break;
case JSMN_STRING:
plist = parse_string(json_string, tokens, &startindex);
break;
case JSMN_ARRAY:
plist = parse_array(json_string, tokens, &startindex);
break;
case JSMN_OBJECT:
plist = parse_object(json_string, tokens, &startindex);
break;
default:
break;
}
free(tokens);
return plist;
}
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