1 #if !defined(JANSSONXX_H)
8 // include in the jansson namespace
13 // represents any JSON value
16 // construct new Value with an undefined value
17 Value() : _value(0) {}
19 // free Value resources
20 ~Value() { json_decref(_value); }
22 // copy an existing Value
23 Value(const Value& e) : _value(json_incref(e._value)) {}
25 // make a reference to an existing json_t value
26 explicit Value(json_t* value) : _value(json_incref(value)) {}
28 // copy an existing Value
29 Value& operator=(const Value& e) {
32 _value = json_incref(e._value);
37 // load a file as a JSON value
38 static Value load_file(const char* path, json_error_t* error = 0) {
39 return Value::_take(json_load_file(path, error));
42 // load a string as a JSON value
43 static Value load_string(const char* string, json_error_t* error = 0) {
44 return Value::_take(json_loads(string, error));
47 // write the value to a file
48 int save_file(const char* path, int flags = JSON_INDENT(2)) const {
49 return json_dump_file(_value, path, flags);
52 // write the value to a string (caller must deallocate with free()!)
53 char* save_string(int flags = JSON_INDENT(2)) const {
54 return json_dumps(_value, flags);
57 // construct Value from input
58 static Value from(const char* value) { return Value::_take(json_string(value)); }
59 static Value from(const std::string& value) { return from(value.c_str()); }
60 static Value from(bool value) { return Value::_take(value ? json_true() : json_false()); }
61 static Value from(int value) { return Value::_take(json_integer(value)); }
62 static Value from(double value) { return Value::_take(json_real(value)); }
64 // create a new empty object
65 static Value object() { return Value::_take(json_object()); }
67 // create a new empty array
68 static Value array() { return Value::_take(json_array()); }
70 // create a new null value
71 static Value null() { return Value::_take(json_null()); }
73 // get the underlying json_t
74 json_t* as_json_t() const { return _value; }
77 bool is_undefined() const { return _value == 0; }
78 bool is_object() const { return json_is_object(_value); }
79 bool is_array() const { return json_is_array(_value); }
80 bool is_string() const { return json_is_string(_value); }
81 bool is_integer() const { return json_is_integer(_value); }
82 bool is_real() const { return json_is_real(_value); }
83 bool is_number() const { return json_is_number(_value); }
84 bool is_true() const { return json_is_true(_value); }
85 bool is_false() const { return json_is_false(_value); }
86 bool is_boolean() const { return json_is_boolean(_value); }
87 bool is_null() const { return json_is_null(_value); }
89 // get size of array or object
90 unsigned int size() const {
92 return json_object_size(_value);
94 return json_array_size(_value);
97 // get value at array index (const version)
98 const Value at(unsigned int index) const {
99 return Value(json_array_get(_value, index));
102 const Value operator[](signed int index) const { return at(index); }
103 const Value operator[](unsigned int index) const { return at(index); }
104 const Value operator[](signed short index) const { return at(index); }
105 const Value operator[](unsigned short index) const { return at(index); }
106 const Value operator[](signed long index) const { return at(index); }
107 const Value operator[](unsigned long index) const { return at(index); }
109 // get value at array index (non-const version)
110 Value at(unsigned int index) {
111 return Value(json_array_get(_value, index));
114 Value operator[](signed int index) { return at(index); }
115 Value operator[](unsigned int index) { return at(index); }
116 Value operator[](signed short index) { return at(index); }
117 Value operator[](unsigned short index) { return at(index); }
118 Value operator[](signed long index) { return at(index); }
119 Value operator[](unsigned long index) { return at(index); }
121 // get object property
122 const Value get(const char* key) const {
123 return Value(json_object_get(_value, key));
126 const Value get(const std::string& key) const { return get(key.c_str()); }
127 const Value operator[](const char* key) const { return get(key); }
128 const Value operator[](const std::string& key) const { return get(key.c_str()); }
130 // clear all array/object values
133 json_object_clear(_value);
135 json_array_clear(_value);
138 // get value cast to specified type
139 const char* as_cstring() const { return json_string_value(_value); }
140 std::string as_string() const { return as_cstring(); }
141 int as_integer() const { return json_integer_value(_value); }
142 double as_real() const { return json_real_value(_value); }
143 double as_number() const { return json_number_value(_value); }
144 bool as_boolean() const { return is_true(); }
146 // set an object property (converts value to object is not one already)
147 Value& set_key(const char* key, const Value& value) {
150 _value = json_object();
153 json_object_set(_value, key, value.as_json_t());
158 Value& set_key(const std::string& key, const Value& value) {
159 return set_key(key.c_str(), value);
162 // set an array index (converts value to object is not one already)
163 Value& set_at(unsigned int index, const Value& value) {
166 _value = json_array();
170 json_array_append(_value, value.as_json_t());
172 json_array_set(_value, index, value.as_json_t());
177 Value& set_at(int index, const Value& value) {
178 return set_at(static_cast<unsigned int>(index), value);
182 // take ownership of a json_t (does not increase reference count)
183 static Value _take(json_t* json) {
189 // internal value pointer
193 // iterators over a JSON object
196 // construct a new iterator for a given object
197 Iterator(const Value& value) : _object(value), _iter(0) {
198 _iter = json_object_iter(_object.as_json_t());
201 // increment iterator
203 _iter = json_object_iter_next(_object.as_json_t(), _iter);
206 Iterator& operator++() { next(); return *this; }
208 // test if iterator is still valid
209 bool valid() const { return _iter != 0; }
210 operator bool() const { return valid(); }
213 const char* ckey() const {
214 return json_object_iter_key(_iter);
217 std::string key() const { return ckey(); }
220 const Value value() const {
221 return Value(json_object_iter_value(_iter));
225 const Value operator*() const { return value(); }
229 Iterator(const Iterator&);
230 Iterator& operator=(const Iterator&);
232 // object being iterated over
239 } // namespace jansson