class Iterator;
class Value;
- // base class for JSON value interface
- template <typename _Base>
- class _ValueBase : public _Base {
- public:
- // empty constructor
- _ValueBase() : _Base() {}
+ namespace _private {
+ class ElementProxy;
+ class PropertyProxy;
+
+ // base class for JSON value interface
+ template <typename _Base>
+ class ValueBase : public _Base {
+ public:
+ // empty constructor
+ ValueBase() : _Base() {}
+
+ // copy constructor
+ ValueBase(const _Base& base) : _Base(base) {}
+
+ // create reference to value
+ ValueBase(json_t* json) : _Base(json) {}
+
+ // assignment operator
+ ValueBase& operator=(const Value& value) { _Base::operator=(value); return *this; }
+
+ // check value type
+ bool is_undefined() const { return _Base::as_json() == 0; }
+ bool is_object() const { return json_is_object(_Base::as_json()); }
+ bool is_array() const { return json_is_array(_Base::as_json()); }
+ bool is_string() const { return json_is_string(_Base::as_json()); }
+ bool is_integer() const { return json_is_integer(_Base::as_json()); }
+ bool is_real() const { return json_is_real(_Base::as_json()); }
+ bool is_number() const { return json_is_number(_Base::as_json()); }
+ bool is_true() const { return json_is_true(_Base::as_json()); }
+ bool is_false() const { return json_is_false(_Base::as_json()); }
+ bool is_boolean() const { return json_is_boolean(_Base::as_json()); }
+ bool is_null() const { return json_is_null(_Base::as_json()); }
+
+ // get size of array or object
+ inline unsigned int size() const;
+
+ // get value at array index (const version)
+ inline const Value at(unsigned int index) const;
+
+ inline const Value operator[](signed int index) const;
+ inline const Value operator[](unsigned int index) const;
+ inline const Value operator[](signed short index) const;
+ inline const Value operator[](unsigned short index) const;
+ inline const Value operator[](signed long index) const;
+ inline const Value operator[](unsigned long index) const;
+
+ // get value at array index (non-const version)
+ inline ValueBase<ElementProxy> at(unsigned int index);
+
+ inline ValueBase<ElementProxy> operator[](signed int index);
+ inline ValueBase<ElementProxy> operator[](unsigned int index);
+ inline ValueBase<ElementProxy> operator[](signed short index);
+ inline ValueBase<ElementProxy> operator[](unsigned short index);
+ inline ValueBase<ElementProxy> operator[](signed long index);
+ inline ValueBase<ElementProxy> operator[](unsigned long index);
+
+ // get object property (const version)
+ inline const Value get(const char* key) const;
+
+ inline const Value get(const std::string& key) const;
+ inline const Value operator[](const char* key) const;
+ inline const Value operator[](const std::string& key) const;
+
+ // get object property (non-const version)
+ inline ValueBase<PropertyProxy> get(const char* key);
+
+ inline ValueBase<PropertyProxy> get(const std::string& key);
+ inline ValueBase<PropertyProxy> operator[](const char* key);
+ inline ValueBase<PropertyProxy> operator[](const std::string& key);
+
+ // clear all array/object values
+ inline void clear();
+
+ // get value cast to specified type
+ inline const char* as_cstring() const;
+ inline std::string as_string() const;
+ inline int as_integer() const;
+ inline double as_real() const;
+ inline double as_number() const;
+ inline bool as_boolean() const;
+
+ // set an object property (converts value to object is not one already)
+ inline _Base& set_key(const char* key, const Value& value);
+
+ inline _Base& set_key(const std::string& key, const Value& value);
+
+ // set an array index (converts value to object is not one already)
+ inline _Base& set_at(unsigned int index, const Value& value);
+
+ // delete an object key
+ inline _Base& del_key(const char* key);
+
+ inline _Base& del_key(const std::string& key);
+
+ // delete an item from an array by index
+ inline _Base& del_at(unsigned int index);
+
+ // insert an item into an array at a given index
+ inline _Base& insert_at(unsigned int index, const Value& value);
+ };
+
+ // represents any JSON value, private base
+ class Basic {
+ public:
+ // construct new Value with an undefined value
+ Basic() : _value(0) {}
+
+ // copy constructor
+ Basic(const Basic& value) : _value(json_incref(value._value)) {}
+
+ // make a reference to an existing json_t value
+ explicit Basic(json_t* value) : _value(json_incref(value)) {}
+
+ // free Value resources
+ ~Basic() { json_decref(_value); }
+
+ // copy an existing Value
+ Basic& operator=(const Basic& e) {
+ if (&e != this) {
+ json_decref(_value);
+ _value = json_incref(e._value);
+ }
+ return *this;
+ }
- // copy constructor
- _ValueBase(const _Base& base) : _Base(base) {}
+ // get the underlying json_t
+ json_t* as_json() const { return _value; }
- // create reference to value
- _ValueBase(json_t* json) : _Base(json) {}
-
- // check value type
- bool is_undefined() const { return _Base::as_json() == 0; }
- bool is_object() const { return json_is_object(_Base::as_json()); }
- bool is_array() const { return json_is_array(_Base::as_json()); }
- bool is_string() const { return json_is_string(_Base::as_json()); }
- bool is_integer() const { return json_is_integer(_Base::as_json()); }
- bool is_real() const { return json_is_real(_Base::as_json()); }
- bool is_number() const { return json_is_number(_Base::as_json()); }
- bool is_true() const { return json_is_true(_Base::as_json()); }
- bool is_false() const { return json_is_false(_Base::as_json()); }
- bool is_boolean() const { return json_is_boolean(_Base::as_json()); }
- bool is_null() const { return json_is_null(_Base::as_json()); }
-
- // get size of array or object
- inline unsigned int size() const;
-
- // get value at array index (const version)
- inline const Value at(unsigned int index) const;
-
- inline const Value operator[](signed int index) const;
- inline const Value operator[](unsigned int index) const;
- inline const Value operator[](signed short index) const;
- inline const Value operator[](unsigned short index) const;
- inline const Value operator[](signed long index) const;
- inline const Value operator[](unsigned long index) const;
-
- // get value at array index (non-const version)
- inline Value at(unsigned int index);
-
- inline Value operator[](signed int index);
- inline Value operator[](unsigned int index);
- inline Value operator[](signed short index);
- inline Value operator[](unsigned short index);
- inline Value operator[](signed long index);
- inline Value operator[](unsigned long index);
-
- // get object property
- inline const Value get(const char* key) const;
-
- inline const Value get(const std::string& key) const;
- inline const Value operator[](const char* key) const;
- inline const Value operator[](const std::string& key) const;
-
- // clear all array/object values
- inline void clear();
-
- // get value cast to specified type
- inline const char* as_cstring() const;
- inline std::string as_string() const;
- inline int as_integer() const;
- inline double as_real() const;
- inline double as_number() const;
- inline bool as_boolean() const;
-
- // set an object property (converts value to object is not one already)
- inline _Base& set_key(const char* key, const Value& value);
-
- inline _Base& set_key(const std::string& key, const Value& value);
-
- // set an array index (converts value to object is not one already)
- inline _Base& set_at(unsigned int index, const Value& value);
-
- // delete an object key
- inline _Base& del_key(const char* key);
-
- inline _Base& del_key(const std::string& key);
-
- // delete an item from an array by index
- inline _Base& del_at(unsigned int index);
-
- // insert an item into an array at a given index
- inline _Base& insert_at(unsigned int index, const Value& value);
- };
+ protected:
+ // take ownership of a json_t (does not increase reference count)
+ static Basic _take(json_t* json) {
+ Basic v;
+ v._value = json;
+ return v;
+ }
- // represents any JSON value, private base
- class _Value {
- public:
- // construct new Value with an undefined value
- _Value() : _value(0) {}
+ private:
+ // internal value pointer
+ json_t* _value;
+ };
- // copy constructor
- _Value(const _Value& value) : _value(json_incref(value._value)) {}
+ // proxies an array element
+ class ElementProxy {
+ public:
+ // constructor
+ ElementProxy(json_t* array, unsigned int index) : _array(array), _index(index) {}
- // make a reference to an existing json_t value
- explicit _Value(json_t* value) : _value(json_incref(value)) {}
+ // assign to the proxied element
+ inline ElementProxy& operator=(const Value& value);
- // free Value resources
- ~_Value() { json_decref(_value); }
+ // get the proxied element
+ json_t* as_json() const { return json_array_get(_array, _index); }
- // copy an existing Value
- _Value& operator=(const _Value& e) {
- if (&e != this) {
- json_decref(_value);
- _value = json_incref(e._value);
- }
- return *this;
- }
+ private:
+ // array object we wrap
+ json_t* _array;
- // get the underlying json_t
- json_t* as_json() const { return _value; }
+ // index of property
+ unsigned int _index;
+ };
- protected:
- // take ownership of a json_t (does not increase reference count)
- static _Value _take(json_t* json) {
- _Value v;
- v._value = json;
- return v;
- }
+ // proxies an object property
+ class PropertyProxy {
+ public:
+ // constructor
+ PropertyProxy(json_t* array, const char* key) : _object(array), _key(key) {}
- private:
- // internal value pointer
- json_t* _value;
- };
+ // assign to the proxied element
+ inline PropertyProxy& operator=(const Value& value);
+
+ // get the proxied element
+ json_t* as_json() const { return json_object_get(_object, _key); }
+
+ private:
+ // array object we wrap
+ json_t* _object;
+
+ // key of property
+ const char* _key;
+ };
+
+ } // namespace jansson::_private
// represents any JSON value
- class Value : public _ValueBase<_Value> {
+ class Value : public _private::ValueBase<_private::Basic> {
public:
// empty constructor
- Value() : _ValueBase<_Value>() {}
+ Value() : _private::ValueBase<_private::Basic>() {}
// copy constructor for base
- Value(const _Value& value) : _ValueBase<_Value>(value) {}
+ Value(const _private::Basic& value) : _private::ValueBase<_private::Basic>(value) {}
// copy constructor for base
- Value(const _ValueBase<_Value>& value) : _ValueBase<_Value>(value) {}
+ Value(const _private::ValueBase<_private::Basic>& value) : _private::ValueBase<_private::Basic>(value) {}
// copy constructor
- Value(const Value& value) : _ValueBase<_Value>(value) {}
+ Value(const Value& value) : _private::ValueBase<_private::Basic>(value) {}
// create reference to value
- explicit Value(json_t* json) : _ValueBase<_Value>(json) {}
+ explicit Value(json_t* json) : _private::ValueBase<_private::Basic>(json) {}
// construct Value from input
static inline Value from(const char* value) { return Value::_take(json_string(value)); }
_iter = json_object_iter(_object.as_json());
}
+ // construct a new iterator for a given object
+ Iterator(const _private::ValueBase<_private::PropertyProxy>& value) : _object(value.as_json()), _iter(0) {
+ _iter = json_object_iter(_object.as_json());
+ }
+
// increment iterator
void next() {
_iter = json_object_iter_next(_object.as_json(), _iter);
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