/**
* \file
*
* \brief JSON parser
*
* Copyright (c) 2016 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
#include "json.h"
#include <string.h>
#include <stdio.h>
#include <errno.h>
enum json_cmd
{
JSON_CMD_NONE = 0,
JSON_CMD_ENTER_OBJECT,
JSON_CMD_EXIT_OBJECT,
JSON_CMD_ENTER_ARRAY,
JSON_CMD_EXIT_ARRAY
};
/**
* @token is pair of name : value.
* @param buffer : [in] Read out line
* @param dest : [out] destination buffer
* @param cmd : [out] 0 : none 1: enter object 2: exit object 3: enter array 4: exit array
* @return : start point of next token
*/
static char * _json_read_token(char *buffer, uint32_t buffer_size, char *dest, uint32_t dest_size, enum json_cmd *cmd)
{
uint32_t dest_index = 0;
char in_quote = 0;
*cmd = JSON_CMD_NONE;
dest[0] = '\0';
for (; buffer_size > 0; buffer_size--) {
char ch = *buffer++;
if ( ch == '\"') {
if(in_quote == 0) {
in_quote = 1;
} else if (in_quote == 1) {
in_quote = 0;
}
}
if (!in_quote) {
if (ch == ',') {
break;
} else if (ch == '}') {
*cmd = JSON_CMD_EXIT_OBJECT;
break;
} else if (ch == ']') {
*cmd = JSON_CMD_EXIT_ARRAY;
break;
} else if(ch == '\t' || ch == ' ' || ch == '\r' || ch == '\n') {
continue;
} else if(ch == '\0') {
return NULL;
} else if( ch == '{') {
*cmd = JSON_CMD_ENTER_OBJECT;
break;
} else if( ch == '[') {
*cmd = JSON_CMD_ENTER_ARRAY;
break;
}
}
if (dest_index < dest_size) {
dest[dest_index++] = ch;
}
}
dest[dest_index] = '\0';
return buffer;
}
static void _json_parse(char *data, char *ptr, enum json_cmd cmd, struct json_obj *out)
{
int i;
int minus = 0;
int exponent = -1;
int num = 0;
int find_point = 0;
int real_size = 1;
int minus_exp = 0;
if(data[0] != '\0') {
for (i = 0; *data != '\0' && *data != ':'; data++) {
if (*data != '\"' && i < JSON_MAX_NAME_SIZE - 1) {
out->name[i++] = *data;
}
}
out->name[i] = '\0';
out->type = JSON_TYPE_NULL;
if (*data == ':') {
data++;
if (*data == '-') {
minus = 1;
data++;
}
if (*data == '\"') {
out->type = JSON_TYPE_STRING;
for (i = 0; *data != '\0'; data++) {
if (*data != '\"' && i < JSON_MAX_TOKEN_SIZE - JSON_MAX_NAME_SIZE - 1) {
out->value.s[i++] = *data;
}
}
out->value.s[i] = '\0';
} else if (*data >= '0' && *data <= '9') {
for (; *data != '\0'; data++) {
if (*data >= '0' && *data <= '9') {
if (exponent < 0) {
num = num * 10 + (*data & 0xF);
if (find_point == 1) {
real_size = 10;
}
} else {
exponent = exponent * 10 + *data - '0';
}
} else if (*data == '.') {
find_point = 1;
} else if (*data == 'e' || *data == 'E') {
exponent = 0;
} else if (*data == '-' && exponent >= 0) {
minus_exp = 1;
}
}
if (find_point == 0 && exponent < 0) {
out->type = JSON_TYPE_INTEGER;
out->value.i = (minus) ? num * -1 : num;
} else {
out->type = JSON_TYPE_REAL;
out->value.d = (minus) ? (double)num / (double)real_size * -1 : (double)num / (double)real_size;
if (exponent >= 0) {
if (minus_exp) {
for (i = 0; i < exponent; i++) {
out->value.d /= 10.0f;
}
} else {
for (i = 0; i < exponent; i++) {
out->value.d *= 10.0f;
}
}
}
}
} else if (!strncmp(data, "true", 4)) {
out->type = JSON_TYPE_BOOLEAN;
out->value.b = 1;
} else if (!strncmp(data, "false", 5)) {
out->type = JSON_TYPE_BOOLEAN;
out->value.b = 0;
} else if(*data == '\0' || !strncmp(data, "null", 4)) {
out->type = JSON_TYPE_NULL;
} else {
out->type = JSON_TYPE_STRING;
for (i = 0; *data != '\0'; data++) {
if (*data != '\"' && i < JSON_MAX_TOKEN_SIZE - JSON_MAX_NAME_SIZE - 1) {
out->value.s[i++] = *data;
}
}
out->value.s[i] = '\0';
}
}
} else {
out->name[0] = 0;
}
if (cmd == JSON_CMD_ENTER_OBJECT) {
out->type = JSON_TYPE_OBJECT;
for (; *ptr != '{'; ptr--);
out->value.o = ptr;
} else if (cmd == JSON_CMD_ENTER_ARRAY) {
out->type = JSON_TYPE_ARRAY;
for (; *ptr != '['; ptr--);
out->value.o = ptr;
}
}
int json_create(struct json_obj *obj, const char *data, int data_len)
{
if (obj == NULL || data == NULL) {
return -EINVAL;
}
for (; *data != '{'; data++, data_len--) {
if (*data == '\0') {
return -EINVAL;
}
}
obj->type = JSON_TYPE_OBJECT;
obj->name[0] = 0;
obj->value.o = (char *)data;
obj->end_ptr = (char *)data + data_len;
return 0;
}
int json_get_child_count(struct json_obj *obj)
{
char dest[2];
enum json_cmd cmd;
int child = 0;
char *ptr;
int depth = -1;
if (obj == NULL || (obj->type != JSON_TYPE_OBJECT && obj->type != JSON_TYPE_ARRAY) ||
obj->value.o == NULL) {
return -EINVAL;
}
for (ptr = obj->value.o; ; ) {
ptr = _json_read_token(ptr, obj->end_ptr - ptr, dest, 1, &cmd);
if (ptr == NULL) {
break;
}
if (dest[0] == '\0' && cmd == JSON_CMD_NONE) {
continue;
}
if (cmd == JSON_CMD_EXIT_ARRAY || cmd == JSON_CMD_EXIT_OBJECT) {
depth--;
if (depth < 0) {
break;
}
} else {
if (depth == 0) {
/* Found members */
child++;
}
if (cmd == JSON_CMD_ENTER_OBJECT || cmd == JSON_CMD_ENTER_ARRAY) {
depth++;
}
}
}
return child;
}
int json_get_child(struct json_obj *obj, int index, struct json_obj *out)
{
char dest[JSON_MAX_TOKEN_SIZE];
enum json_cmd cmd;
int child = 0;
char *ptr;
int depth = -1;
if (obj == NULL || out == NULL || (obj->type != JSON_TYPE_OBJECT && obj->type != JSON_TYPE_ARRAY) ||
obj->value.o == NULL) {
return -EINVAL;
}
for (ptr = obj->value.o; ; ) {
ptr = _json_read_token(ptr, obj->end_ptr - ptr, dest, JSON_MAX_TOKEN_SIZE - 1, &cmd);
if (ptr == NULL) {
break;
}
if (dest[0] == '\0' && cmd == JSON_CMD_NONE) {
continue;
}
if (cmd == JSON_CMD_EXIT_ARRAY || cmd == JSON_CMD_EXIT_OBJECT) {
depth--;
if (depth < 0) {
break;
}
} else {
if (depth == 0) {
/* Found members */
if (child == index) {
_json_parse(dest, ptr, cmd, out);
out->end_ptr = obj->end_ptr;
break;
}
child++;
}
if (cmd == JSON_CMD_ENTER_OBJECT || cmd == JSON_CMD_ENTER_ARRAY) {
depth++;
}
}
}
return child;
}
int json_find(struct json_obj *obj, const char *name, struct json_obj *out)
{
char dest[JSON_MAX_TOKEN_SIZE];
enum json_cmd cmd;
char *ptr;
char *name_ptr =
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