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) {
31 _value = json_incref(e._value);
35 // take ownership of a json_t (does not increase reference count)
36 Value& take_ownership(json_t* value) {
42 // load a file as a JSON value
43 static Value load_file(const char* path, json_error_t* error = 0) {
44 return Value().take_ownership(json_load_file(path, error));
47 // load a string as a JSON value
48 static Value load_string(const char* string, json_error_t* error = 0) {
49 return Value().take_ownership(json_loads(string, error));
52 // write the value to a file
53 int save_file(const char* path, int flags = JSON_INDENT(2)) const {
54 return json_dump_file(_value, path, flags);
57 // write the value to a string (caller must deallocate with free()!)
58 char* save_string(int flags = JSON_INDENT(2)) const {
59 return json_dumps(_value, flags);
62 // construct Value from input
63 static Value from(const char* value) { return Value().take_ownership(json_string(value)); }
64 static Value from(const std::string& value) { return from(value.c_str()); }
65 static Value from(bool value) { return Value().take_ownership(value ? json_true() : json_false()); }
66 static Value from(int value) { return Value().take_ownership(json_integer(value)); }
67 static Value from(double value) { return Value().take_ownership(json_real(value)); }
69 // create a new empty object
70 static Value object() { return Value().take_ownership(json_object()); }
72 // create a new empty array
73 static Value array() { return Value().take_ownership(json_array()); }
75 // create a new null value
76 static Value null() { return Value().take_ownership(json_null()); }
78 // get the underlying json_t
79 json_t* as_json_t() const { return _value; }
82 bool is_undefined() const { return _value == 0; }
83 bool is_object() const { return json_is_object(_value); }
84 bool is_array() const { return json_is_array(_value); }
85 bool is_string() const { return json_is_string(_value); }
86 bool is_integer() const { return json_is_integer(_value); }
87 bool is_real() const { return json_is_real(_value); }
88 bool is_number() const { return json_is_number(_value); }
89 bool is_true() const { return json_is_true(_value); }
90 bool is_false() const { return json_is_false(_value); }
91 bool is_boolean() const { return json_is_boolean(_value); }
92 bool is_null() const { return json_is_null(_value); }
94 // get size of array or object
95 unsigned int size() const {
97 return json_object_size(_value);
99 return json_array_size(_value);
104 // get value at array index (const version)
105 const Value at(unsigned int index) const {
107 return Value(json_array_get(_value, index));
112 const Value operator[](signed int index) const { return at(index); }
113 const Value operator[](unsigned int index) const { return at(index); }
114 const Value operator[](signed short index) const { return at(index); }
115 const Value operator[](unsigned short index) const { return at(index); }
116 const Value operator[](signed long index) const { return at(index); }
117 const Value operator[](unsigned long index) const { return at(index); }
119 // get value at array index (non-const version)
120 Value at(unsigned int index) {
122 return Value(json_array_get(_value, index));
127 Value operator[](signed int index) { return at(index); }
128 Value operator[](unsigned int index) { return at(index); }
129 Value operator[](signed short index) { return at(index); }
130 Value operator[](unsigned short index) { return at(index); }
131 Value operator[](signed long index) { return at(index); }
132 Value operator[](unsigned long index) { return at(index); }
134 // get object property
135 const Value get(const char* key) const {
137 return Value(json_object_get(_value, key));
142 const Value get(const std::string& key) const { return get(key.c_str()); }
143 const Value operator[](const char* key) const { return get(key); }
144 const Value operator[](const std::string& key) const { return get(key.c_str()); }
146 // clear all array/object values
149 json_object_clear(_value);
151 json_array_clear(_value);
154 // get value cast to specified type
155 const char* as_cstring() const { return json_string_value(_value); }
156 std::string as_string() const { return as_cstring(); }
157 int as_integer() const { return json_integer_value(_value); }
158 double as_real() const { return json_real_value(_value); }
159 double as_number() const { return json_number_value(_value); }
160 bool as_boolean() const { return is_true(); }
162 // set an object property (converts value to object is not one already)
163 Value& set(const char* key, const Value& value) {
166 _value = json_object();
169 json_object_set(_value, key, value.as_json_t());
174 // set an array index (converts value to object is not one already)
175 Value& set(unsigned int index, const Value& value) {
178 _value = json_array();
182 json_array_append(_value, value.as_json_t());
184 json_array_set(_value, index, value.as_json_t());
189 Value& set(int index, const Value& value) { return set(static_cast<unsigned int>(index), value); }
192 // internal value pointer
196 // iterators over a JSON object
199 // construct a new iterator for a given object
200 Iterator(const Value& value) : _object(value), _iter(0) {
201 _iter = json_object_iter(_object.as_json_t());
204 // increment iterator
207 _iter = json_object_iter_next(_object.as_json_t(), _iter);
210 Iterator& operator++() { next(); return *this; }
212 // test if iterator is still valid
213 bool valid() const { return _iter != 0; }
214 operator bool() const { return valid(); }
217 const char* ckey() const {
219 return json_object_iter_key(_iter);
224 std::string key() const { return ckey(); }
227 const Value value() const {
229 return Value(json_object_iter_value(_iter));
235 const Value operator*() const { return value(); }
239 Iterator(const Iterator&);
240 Iterator& operator=(const Iterator&);
242 // object being iterated over
249 } // namespace jansson