251 lines
7.1 KiB
C++
251 lines
7.1 KiB
C++
#if !defined(JANSSONXX_H)
|
|
#define JANSSONXX_H 1
|
|
|
|
#include <string>
|
|
#include <ostream>
|
|
#include <istream>
|
|
#include <sstream>
|
|
#include <cstdlib>
|
|
|
|
namespace jansson {
|
|
|
|
// include in the jansson namespace
|
|
#include <jansson.h>
|
|
|
|
class Iterator;
|
|
|
|
// represents any JSON value
|
|
class Value {
|
|
public:
|
|
// construct new Value with an undefined value
|
|
Value() : _value(0) {}
|
|
|
|
// free Value resources
|
|
~Value() { json_decref(_value); }
|
|
|
|
// copy an existing Value
|
|
Value(const Value& e) : _value(json_incref(e._value)) {}
|
|
|
|
// make a reference to an existing json_t value
|
|
explicit Value(json_t* value) : _value(json_incref(value)) {}
|
|
|
|
// copy an existing Value
|
|
Value& operator=(const Value& e) {
|
|
if (&e != this) {
|
|
json_decref(_value);
|
|
_value = json_incref(e._value);
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
// load a file as a JSON value
|
|
static Value load_file(const char* path, json_error_t* error = 0) {
|
|
return Value::_take(json_load_file(path, error));
|
|
}
|
|
|
|
// load a string as a JSON value
|
|
static Value load_string(const char* string, json_error_t* error = 0) {
|
|
return Value::_take(json_loads(string, error));
|
|
}
|
|
|
|
// write the value to a file
|
|
int save_file(const char* path, int flags = JSON_INDENT(2)) const {
|
|
return json_dump_file(_value, path, flags);
|
|
}
|
|
|
|
// write the value to a string (caller must deallocate with free()!)
|
|
char* save_string(int flags = JSON_INDENT(2)) const {
|
|
return json_dumps(_value, flags);
|
|
}
|
|
|
|
// construct Value from input
|
|
static Value from(const char* value) { return Value::_take(json_string(value)); }
|
|
static Value from(const std::string& value) { return from(value.c_str()); }
|
|
static Value from(bool value) { return Value::_take(value ? json_true() : json_false()); }
|
|
static Value from(int value) { return Value::_take(json_integer(value)); }
|
|
static Value from(double value) { return Value::_take(json_real(value)); }
|
|
|
|
// create a new empty object
|
|
static Value object() { return Value::_take(json_object()); }
|
|
|
|
// create a new empty array
|
|
static Value array() { return Value::_take(json_array()); }
|
|
|
|
// create a new null value
|
|
static Value null() { return Value::_take(json_null()); }
|
|
|
|
// get the underlying json_t
|
|
json_t* as_json() const { return _value; }
|
|
|
|
// check value type
|
|
bool is_undefined() const { return _value == 0; }
|
|
bool is_object() const { return json_is_object(_value); }
|
|
bool is_array() const { return json_is_array(_value); }
|
|
bool is_string() const { return json_is_string(_value); }
|
|
bool is_integer() const { return json_is_integer(_value); }
|
|
bool is_real() const { return json_is_real(_value); }
|
|
bool is_number() const { return json_is_number(_value); }
|
|
bool is_true() const { return json_is_true(_value); }
|
|
bool is_false() const { return json_is_false(_value); }
|
|
bool is_boolean() const { return json_is_boolean(_value); }
|
|
bool is_null() const { return json_is_null(_value); }
|
|
|
|
// get size of array or object
|
|
unsigned int size() const {
|
|
if (is_object())
|
|
return json_object_size(_value);
|
|
else
|
|
return json_array_size(_value);
|
|
}
|
|
|
|
// get value at array index (const version)
|
|
const Value at(unsigned int index) const {
|
|
return Value(json_array_get(_value, index));
|
|
}
|
|
|
|
const Value operator[](signed int index) const { return at(index); }
|
|
const Value operator[](unsigned int index) const { return at(index); }
|
|
const Value operator[](signed short index) const { return at(index); }
|
|
const Value operator[](unsigned short index) const { return at(index); }
|
|
const Value operator[](signed long index) const { return at(index); }
|
|
const Value operator[](unsigned long index) const { return at(index); }
|
|
|
|
// get value at array index (non-const version)
|
|
Value at(unsigned int index) {
|
|
return Value(json_array_get(_value, index));
|
|
}
|
|
|
|
Value operator[](signed int index) { return at(index); }
|
|
Value operator[](unsigned int index) { return at(index); }
|
|
Value operator[](signed short index) { return at(index); }
|
|
Value operator[](unsigned short index) { return at(index); }
|
|
Value operator[](signed long index) { return at(index); }
|
|
Value operator[](unsigned long index) { return at(index); }
|
|
|
|
// get object property
|
|
const Value get(const char* key) const {
|
|
return Value(json_object_get(_value, key));
|
|
}
|
|
|
|
const Value get(const std::string& key) const { return get(key.c_str()); }
|
|
const Value operator[](const char* key) const { return get(key); }
|
|
const Value operator[](const std::string& key) const { return get(key.c_str()); }
|
|
|
|
// clear all array/object values
|
|
void clear() {
|
|
if (is_object())
|
|
json_object_clear(_value);
|
|
else
|
|
json_array_clear(_value);
|
|
}
|
|
|
|
// get value cast to specified type
|
|
const char* as_cstring() const { return json_string_value(_value); }
|
|
std::string as_string() const { return as_cstring(); }
|
|
int as_integer() const { return json_integer_value(_value); }
|
|
double as_real() const { return json_real_value(_value); }
|
|
double as_number() const { return json_number_value(_value); }
|
|
bool as_boolean() const { return is_true(); }
|
|
|
|
// set an object property (converts value to object is not one already)
|
|
Value& set_key(const char* key, const Value& value) {
|
|
json_object_set(_value, key, value.as_json());
|
|
return *this;
|
|
}
|
|
|
|
Value& set_key(const std::string& key, const Value& value) {
|
|
return set_key(key.c_str(), value);
|
|
}
|
|
|
|
// set an array index (converts value to object is not one already)
|
|
Value& set_at(unsigned int index, const Value& value) {
|
|
if (index == size())
|
|
json_array_append(_value, value.as_json());
|
|
else
|
|
json_array_set(_value, index, value.as_json());
|
|
return *this;
|
|
}
|
|
|
|
Value& set_at(int index, const Value& value) {
|
|
return set_at(static_cast<unsigned int>(index), value);
|
|
}
|
|
|
|
private:
|
|
// take ownership of a json_t (does not increase reference count)
|
|
static Value _take(json_t* json) {
|
|
Value v;
|
|
v._value = json;
|
|
return v;
|
|
}
|
|
|
|
// internal value pointer
|
|
json_t* _value;
|
|
};
|
|
|
|
// iterators over a JSON object
|
|
class Iterator {
|
|
public:
|
|
// construct a new iterator for a given object
|
|
Iterator(const Value& value) : _object(value), _iter(0) {
|
|
_iter = json_object_iter(_object.as_json());
|
|
}
|
|
|
|
// increment iterator
|
|
void next() {
|
|
_iter = json_object_iter_next(_object.as_json(), _iter);
|
|
}
|
|
|
|
Iterator& operator++() { next(); return *this; }
|
|
|
|
// test if iterator is still valid
|
|
bool valid() const { return _iter != 0; }
|
|
operator bool() const { return valid(); }
|
|
|
|
// get key
|
|
const char* ckey() const {
|
|
return json_object_iter_key(_iter);
|
|
}
|
|
|
|
std::string key() const { return ckey(); }
|
|
|
|
// get value
|
|
const Value value() const {
|
|
return Value(json_object_iter_value(_iter));
|
|
}
|
|
|
|
// dereference value
|
|
const Value operator*() const { return value(); }
|
|
|
|
private:
|
|
// disallow copying
|
|
Iterator(const Iterator&);
|
|
Iterator& operator=(const Iterator&);
|
|
|
|
// object being iterated over
|
|
Value _object;
|
|
|
|
// iterator value
|
|
void* _iter;
|
|
};
|
|
|
|
} // namespace jansson
|
|
|
|
// stream JSON value out
|
|
std::ostream& operator<<(std::ostream& os, const jansson::Value& value) {
|
|
char* tmp = value.save_string();
|
|
os << tmp;
|
|
free(tmp);
|
|
return os;
|
|
}
|
|
|
|
// read JSON value
|
|
std::istream& operator>>(std::istream& is, jansson::Value& value) {
|
|
std::stringstream tmp;
|
|
while (is)
|
|
tmp << static_cast<char>(is.get());
|
|
value = jansson::Value::load_string(tmp.str().c_str());
|
|
return is;
|
|
}
|
|
|
|
#endif
|