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meshtastic-firmware/src/mqtt/JSONValue.cpp

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/*
* File JSONValue.cpp part of the SimpleJSON Library - http://mjpa.in/json
*
* Copyright (C) 2010 Mike Anchor
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <iostream>
#include <math.h>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <vector>
#include "JSONValue.h"
// Macros to free an array/object
#define FREE_ARRAY(x) \
{ \
JSONArray::iterator iter; \
for (iter = x.begin(); iter != x.end(); iter++) { \
delete *iter; \
} \
}
#define FREE_OBJECT(x) \
{ \
JSONObject::iterator iter; \
for (iter = x.begin(); iter != x.end(); iter++) { \
delete (*iter).second; \
} \
}
/**
* Parses a JSON encoded value to a JSONValue object
*
* @access protected
*
* @param char** data Pointer to a char* that contains the data
*
* @return JSONValue* Returns a pointer to a JSONValue object on success, NULL on error
*/
JSONValue *JSONValue::Parse(const char **data)
{
// Is it a string?
if (**data == '"') {
std::string str;
if (!JSON::ExtractString(&(++(*data)), str))
return NULL;
else
return new JSONValue(str);
}
// Is it a boolean?
else if ((simplejson_csnlen(*data, 4) && strncasecmp(*data, "true", 4) == 0) ||
(simplejson_csnlen(*data, 5) && strncasecmp(*data, "false", 5) == 0)) {
bool value = strncasecmp(*data, "true", 4) == 0;
(*data) += value ? 4 : 5;
return new JSONValue(value);
}
// Is it a null?
else if (simplejson_csnlen(*data, 4) && strncasecmp(*data, "null", 4) == 0) {
(*data) += 4;
return new JSONValue();
}
// Is it a number?
else if (**data == '-' || (**data >= '0' && **data <= '9')) {
// Negative?
bool neg = **data == '-';
if (neg)
(*data)++;
double number = 0.0;
// Parse the whole part of the number - only if it wasn't 0
if (**data == '0')
(*data)++;
else if (**data >= '1' && **data <= '9')
number = JSON::ParseInt(data);
else
return NULL;
// Could be a decimal now...
if (**data == '.') {
(*data)++;
// Not get any digits?
if (!(**data >= '0' && **data <= '9'))
return NULL;
// Find the decimal and sort the decimal place out
// Use ParseDecimal as ParseInt won't work with decimals less than 0.1
// thanks to Javier Abadia for the report & fix
double decimal = JSON::ParseDecimal(data);
// Save the number
number += decimal;
}
// Could be an exponent now...
if (**data == 'E' || **data == 'e') {
(*data)++;
// Check signage of expo
bool neg_expo = false;
if (**data == '-' || **data == '+') {
neg_expo = **data == '-';
(*data)++;
}
// Not get any digits?
if (!(**data >= '0' && **data <= '9'))
return NULL;
// Sort the expo out
double expo = JSON::ParseInt(data);
for (double i = 0.0; i < expo; i++)
number = neg_expo ? (number / 10.0) : (number * 10.0);
}
// Was it neg?
if (neg)
number *= -1;
return new JSONValue(number);
}
// An object?
else if (**data == '{') {
JSONObject object;
(*data)++;
while (**data != 0) {
// Whitespace at the start?
if (!JSON::SkipWhitespace(data)) {
FREE_OBJECT(object);
return NULL;
}
// Special case - empty object
if (object.size() == 0 && **data == '}') {
(*data)++;
return new JSONValue(object);
}
// We want a string now...
std::string name;
if (!JSON::ExtractString(&(++(*data)), name)) {
FREE_OBJECT(object);
return NULL;
}
// More whitespace?
if (!JSON::SkipWhitespace(data)) {
FREE_OBJECT(object);
return NULL;
}
// Need a : now
if (*((*data)++) != ':') {
FREE_OBJECT(object);
return NULL;
}
// More whitespace?
if (!JSON::SkipWhitespace(data)) {
FREE_OBJECT(object);
return NULL;
}
// The value is here
JSONValue *value = Parse(data);
if (value == NULL) {
FREE_OBJECT(object);
return NULL;
}
// Add the name:value
if (object.find(name) != object.end())
delete object[name];
object[name] = value;
// More whitespace?
if (!JSON::SkipWhitespace(data)) {
FREE_OBJECT(object);
return NULL;
}
// End of object?
if (**data == '}') {
(*data)++;
return new JSONValue(object);
}
// Want a , now
if (**data != ',') {
FREE_OBJECT(object);
return NULL;
}
(*data)++;
}
// Only here if we ran out of data
FREE_OBJECT(object);
return NULL;
}
// An array?
else if (**data == '[') {
JSONArray array;
(*data)++;
while (**data != 0) {
// Whitespace at the start?
if (!JSON::SkipWhitespace(data)) {
FREE_ARRAY(array);
return NULL;
}
// Special case - empty array
if (array.size() == 0 && **data == ']') {
(*data)++;
return new JSONValue(array);
}
// Get the value
JSONValue *value = Parse(data);
if (value == NULL) {
FREE_ARRAY(array);
return NULL;
}
// Add the value
array.push_back(value);
// More whitespace?
if (!JSON::SkipWhitespace(data)) {
FREE_ARRAY(array);
return NULL;
}
// End of array?
if (**data == ']') {
(*data)++;
return new JSONValue(array);
}
// Want a , now
if (**data != ',') {
FREE_ARRAY(array);
return NULL;
}
(*data)++;
}
// Only here if we ran out of data
FREE_ARRAY(array);
return NULL;
}
// Ran out of possibilities, it's bad!
else {
return NULL;
}
}
/**
* Basic constructor for creating a JSON Value of type NULL
*
* @access public
*/
JSONValue::JSONValue(/*NULL*/)
{
type = JSONType_Null;
}
/**
* Basic constructor for creating a JSON Value of type String
*
* @access public
*
* @param char* m_char_value The string to use as the value
*/
JSONValue::JSONValue(const char *m_char_value)
{
type = JSONType_String;
string_value = new std::string(std::string(m_char_value));
}
/**
* Basic constructor for creating a JSON Value of type String
*
* @access public
*
* @param std::string m_string_value The string to use as the value
*/
JSONValue::JSONValue(const std::string &m_string_value)
{
type = JSONType_String;
string_value = new std::string(m_string_value);
}
/**
* Basic constructor for creating a JSON Value of type Bool
*
* @access public
*
* @param bool m_bool_value The bool to use as the value
*/
JSONValue::JSONValue(bool m_bool_value)
{
type = JSONType_Bool;
bool_value = m_bool_value;
}
/**
* Basic constructor for creating a JSON Value of type Number
*
* @access public
*
* @param double m_number_value The number to use as the value
*/
JSONValue::JSONValue(double m_number_value)
{
type = JSONType_Number;
number_value = m_number_value;
}
/**
* Basic constructor for creating a JSON Value of type Number
*
* @access public
*
* @param int m_integer_value The number to use as the value
*/
JSONValue::JSONValue(int m_integer_value)
{
type = JSONType_Number;
number_value = (double)m_integer_value;
}
/**
* Basic constructor for creating a JSON Value of type Number
*
* @access public
*
* @param unsigned int m_integer_value The number to use as the value
*/
JSONValue::JSONValue(unsigned int m_integer_value)
{
type = JSONType_Number;
number_value = (double)m_integer_value;
}
/**
* Basic constructor for creating a JSON Value of type Array
*
* @access public
*
* @param JSONArray m_array_value The JSONArray to use as the value
*/
JSONValue::JSONValue(const JSONArray &m_array_value)
{
type = JSONType_Array;
array_value = new JSONArray(m_array_value);
}
/**
* Basic constructor for creating a JSON Value of type Object
*
* @access public
*
* @param JSONObject m_object_value The JSONObject to use as the value
*/
JSONValue::JSONValue(const JSONObject &m_object_value)
{
type = JSONType_Object;
object_value = new JSONObject(m_object_value);
}
/**
* Copy constructor to perform a deep copy of array / object values
*
* @access public
*
* @param JSONValue m_source The source JSONValue that is being copied
*/
JSONValue::JSONValue(const JSONValue &m_source)
{
type = m_source.type;
switch (type) {
case JSONType_String:
string_value = new std::string(*m_source.string_value);
break;
case JSONType_Bool:
bool_value = m_source.bool_value;
break;
case JSONType_Number:
number_value = m_source.number_value;
break;
case JSONType_Array: {
JSONArray source_array = *m_source.array_value;
JSONArray::iterator iter;
array_value = new JSONArray();
for (iter = source_array.begin(); iter != source_array.end(); iter++)
array_value->push_back(new JSONValue(**iter));
break;
}
case JSONType_Object: {
JSONObject source_object = *m_source.object_value;
object_value = new JSONObject();
JSONObject::iterator iter;
for (iter = source_object.begin(); iter != source_object.end(); iter++) {
std::string name = (*iter).first;
(*object_value)[name] = new JSONValue(*((*iter).second));
}
break;
}
case JSONType_Null:
// Nothing to do.
break;
}
}
/**
* The destructor for the JSON Value object
* Handles deleting the objects in the array or the object value
*
* @access public
*/
JSONValue::~JSONValue()
{
if (type == JSONType_Array) {
JSONArray::iterator iter;
for (iter = array_value->begin(); iter != array_value->end(); iter++)
delete *iter;
delete array_value;
} else if (type == JSONType_Object) {
JSONObject::iterator iter;
for (iter = object_value->begin(); iter != object_value->end(); iter++) {
delete (*iter).second;
}
delete object_value;
} else if (type == JSONType_String) {
delete string_value;
}
}
/**
* Checks if the value is a NULL
*
* @access public
*
* @return bool Returns true if it is a NULL value, false otherwise
*/
bool JSONValue::IsNull() const
{
return type == JSONType_Null;
}
/**
* Checks if the value is a String
*
* @access public
*
* @return bool Returns true if it is a String value, false otherwise
*/
bool JSONValue::IsString() const
{
return type == JSONType_String;
}
/**
* Checks if the value is a Bool
*
* @access public
*
* @return bool Returns true if it is a Bool value, false otherwise
*/
bool JSONValue::IsBool() const
{
return type == JSONType_Bool;
}
/**
* Checks if the value is a Number
*
* @access public
*
* @return bool Returns true if it is a Number value, false otherwise
*/
bool JSONValue::IsNumber() const
{
return type == JSONType_Number;
}
/**
* Checks if the value is an Array
*
* @access public
*
* @return bool Returns true if it is an Array value, false otherwise
*/
bool JSONValue::IsArray() const
{
return type == JSONType_Array;
}
/**
* Checks if the value is an Object
*
* @access public
*
* @return bool Returns true if it is an Object value, false otherwise
*/
bool JSONValue::IsObject() const
{
return type == JSONType_Object;
}
/**
* Retrieves the String value of this JSONValue
* Use IsString() before using this method.
*
* @access public
*
* @return std::string Returns the string value
*/
const std::string &JSONValue::AsString() const
{
return (*string_value);
}
/**
* Retrieves the Bool value of this JSONValue
* Use IsBool() before using this method.
*
* @access public
*
* @return bool Returns the bool value
*/
bool JSONValue::AsBool() const
{
return bool_value;
}
/**
* Retrieves the Number value of this JSONValue
* Use IsNumber() before using this method.
*
* @access public
*
* @return double Returns the number value
*/
double JSONValue::AsNumber() const
{
return number_value;
}
/**
* Retrieves the Array value of this JSONValue
* Use IsArray() before using this method.
*
* @access public
*
* @return JSONArray Returns the array value
*/
const JSONArray &JSONValue::AsArray() const
{
return (*array_value);
}
/**
* Retrieves the Object value of this JSONValue
* Use IsObject() before using this method.
*
* @access public
*
* @return JSONObject Returns the object value
*/
const JSONObject &JSONValue::AsObject() const
{
return (*object_value);
}
/**
* Retrieves the number of children of this JSONValue.
* This number will be 0 or the actual number of children
* if IsArray() or IsObject().
*
* @access public
*
* @return The number of children.
*/
std::size_t JSONValue::CountChildren() const
{
switch (type) {
case JSONType_Array:
return array_value->size();
case JSONType_Object:
return object_value->size();
default:
return 0;
}
}
/**
* Checks if this JSONValue has a child at the given index.
* Use IsArray() before using this method.
*
* @access public
*
* @return bool Returns true if the array has a value at the given index.
*/
bool JSONValue::HasChild(std::size_t index) const
{
if (type == JSONType_Array) {
return index < array_value->size();
} else {
return false;
}
}
/**
* Retrieves the child of this JSONValue at the given index.
* Use IsArray() before using this method.
*
* @access public
*
* @return JSONValue* Returns JSONValue at the given index or NULL
* if it doesn't exist.
*/
JSONValue *JSONValue::Child(std::size_t index)
{
if (index < array_value->size()) {
return (*array_value)[index];
} else {
return NULL;
}
}
/**
* Checks if this JSONValue has a child at the given key.
* Use IsObject() before using this method.
*
* @access public
*
* @return bool Returns true if the object has a value at the given key.
*/
bool JSONValue::HasChild(const char *name) const
{
if (type == JSONType_Object) {
return object_value->find(name) != object_value->end();
} else {
return false;
}
}
/**
* Retrieves the child of this JSONValue at the given key.
* Use IsObject() before using this method.
*
* @access public
*
* @return JSONValue* Returns JSONValue for the given key in the object
* or NULL if it doesn't exist.
*/
JSONValue *JSONValue::Child(const char *name)
{
JSONObject::const_iterator it = object_value->find(name);
if (it != object_value->end()) {
return it->second;
} else {
return NULL;
}
}
/**
* Retrieves the keys of the JSON Object or an empty vector
* if this value is not an object.
*
* @access public
*
* @return std::vector<std::string> A vector containing the keys.
*/
std::vector<std::string> JSONValue::ObjectKeys() const
{
std::vector<std::string> keys;
if (type == JSONType_Object) {
JSONObject::const_iterator iter = object_value->begin();
while (iter != object_value->end()) {
keys.push_back(iter->first);
iter++;
}
}
return keys;
}
/**
* Creates a JSON encoded string for the value with all necessary characters escaped
*
* @access public
*
* @param bool prettyprint Enable prettyprint
*
* @return std::string Returns the JSON string
*/
std::string JSONValue::Stringify(bool const prettyprint) const
{
size_t const indentDepth = prettyprint ? 1 : 0;
return StringifyImpl(indentDepth);
}
/**
* Creates a JSON encoded string for the value with all necessary characters escaped
*
* @access private
*
* @param size_t indentDepth The prettyprint indentation depth (0 : no prettyprint)
*
* @return std::string Returns the JSON string
*/
std::string JSONValue::StringifyImpl(size_t const indentDepth) const
{
std::string ret_string;
size_t const indentDepth1 = indentDepth ? indentDepth + 1 : 0;
std::string const indentStr = Indent(indentDepth);
std::string const indentStr1 = Indent(indentDepth1);
switch (type) {
case JSONType_Null:
ret_string = "null";
break;
case JSONType_String:
ret_string = StringifyString(*string_value);
break;
case JSONType_Bool:
ret_string = bool_value ? "true" : "false";
break;
case JSONType_Number: {
if (isinf(number_value) || isnan(number_value))
ret_string = "null";
else {
std::stringstream ss;
ss.precision(15);
ss << number_value;
ret_string = ss.str();
}
break;
}
case JSONType_Array: {
ret_string = indentDepth ? "[\n" + indentStr1 : "[";
JSONArray::const_iterator iter = array_value->begin();
while (iter != array_value->end()) {
ret_string += (*iter)->StringifyImpl(indentDepth1);
// Not at the end - add a separator
if (++iter != array_value->end())
ret_string += ",";
}
ret_string += indentDepth ? "\n" + indentStr + "]" : "]";
break;
}
case JSONType_Object: {
ret_string = indentDepth ? "{\n" + indentStr1 : "{";
JSONObject::const_iterator iter = object_value->begin();
while (iter != object_value->end()) {
ret_string += StringifyString((*iter).first);
ret_string += ":";
ret_string += (*iter).second->StringifyImpl(indentDepth1);
// Not at the end - add a separator
if (++iter != object_value->end())
ret_string += ",";
}
ret_string += indentDepth ? "\n" + indentStr + "}" : "}";
break;
}
}
return ret_string;
}
/**
* Creates a JSON encoded string with all required fields escaped
* Works from http://www.ecma-internationl.org/publications/files/ECMA-ST/ECMA-262.pdf
* Section 15.12.3.
*
* @access private
*
* @param std::string str The string that needs to have the characters escaped
*
* @return std::string Returns the JSON string
*/
std::string JSONValue::StringifyString(const std::string &str)
{
std::string str_out = "\"";
std::string::const_iterator iter = str.begin();
while (iter != str.end()) {
char chr = *iter;
if (chr == '"' || chr == '\\' || chr == '/') {
str_out += '\\';
str_out += chr;
} else if (chr == '\b') {
str_out += "\\b";
} else if (chr == '\f') {
str_out += "\\f";
} else if (chr == '\n') {
str_out += "\\n";
} else if (chr == '\r') {
str_out += "\\r";
} else if (chr == '\t') {
str_out += "\\t";
} else if (chr < ' ' || chr > 126) {
str_out += "\\u";
for (int i = 0; i < 4; i++) {
int value = (chr >> 12) & 0xf;
if (value >= 0 && value <= 9)
str_out += (char)('0' + value);
else if (value >= 10 && value <= 15)
str_out += (char)('A' + (value - 10));
chr <<= 4;
}
} else {
str_out += chr;
}
iter++;
}
str_out += "\"";
return str_out;
}
/**
* Creates the indentation string for the depth given
*
* @access private
*
* @param size_t indent The prettyprint indentation depth (0 : no indentation)
*
* @return std::string Returns the string
*/
std::string JSONValue::Indent(size_t depth)
{
const size_t indent_step = 2;
depth ? --depth : 0;
std::string indentStr(depth * indent_step, ' ');
return indentStr;
}
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