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);
99 // get value at array index (const version)
100 const Value at(unsigned int index) const {
102 return Value(json_array_get(_value, index));
107 const Value operator[](signed int index) const { return at(index); }
108 const Value operator[](unsigned int index) const { return at(index); }
109 const Value operator[](signed short index) const { return at(index); }
110 const Value operator[](unsigned short index) const { return at(index); }
111 const Value operator[](signed long index) const { return at(index); }
112 const Value operator[](unsigned long index) const { return at(index); }
114 // get value at array index (non-const version)
115 Value at(unsigned int index) {
117 return Value(json_array_get(_value, index));
122 Value operator[](signed int index) { return at(index); }
123 Value operator[](unsigned int index) { return at(index); }
124 Value operator[](signed short index) { return at(index); }
125 Value operator[](unsigned short index) { return at(index); }
126 Value operator[](signed long index) { return at(index); }
127 Value operator[](unsigned long index) { return at(index); }
129 // get object property
130 const Value get(const char* key) const {
132 return Value(json_object_get(_value, key));
137 const Value get(const std::string& key) const { return get(key.c_str()); }
138 const Value operator[](const char* key) const { return get(key); }
139 const Value operator[](const std::string& key) const { return get(key.c_str()); }
141 // clear all array/object values
144 json_object_clear(_value);
146 json_array_clear(_value);
149 // get value cast to specified type
150 const char* as_cstring() const { return json_string_value(_value); }
151 std::string as_string() const { return as_cstring(); }
152 int as_integer() const { return json_integer_value(_value); }
153 double as_real() const { return json_real_value(_value); }
154 double as_number() const { return json_number_value(_value); }
155 bool as_boolean() const { return is_true(); }
157 // set an object property (converts value to object is not one already)
158 Value& set(const char* key, const Value& value) {
161 _value = json_object();
164 json_object_set(_value, key, value.as_json_t());
169 // set an array index (converts value to object is not one already)
170 Value& set(unsigned int index, const Value& value) {
173 _value = json_array();
177 json_array_append(_value, value.as_json_t());
179 json_array_set(_value, index, value.as_json_t());
184 Value& set(int index, const Value& value) { return set(static_cast<unsigned int>(index), value); }
187 // take ownership of a json_t (does not increase reference count)
188 static Value _take(json_t* json) {
194 // internal value pointer
198 // iterators over a JSON object
201 // construct a new iterator for a given object
202 Iterator(const Value& value) : _object(value), _iter(0) {
203 _iter = json_object_iter(_object.as_json_t());
206 // increment iterator
209 _iter = json_object_iter_next(_object.as_json_t(), _iter);
212 Iterator& operator++() { next(); return *this; }
214 // test if iterator is still valid
215 bool valid() const { return _iter != 0; }
216 operator bool() const { return valid(); }
219 const char* ckey() const {
221 return json_object_iter_key(_iter);
226 std::string key() const { return ckey(); }
229 const Value value() const {
231 return Value(json_object_iter_value(_iter));
237 const Value operator*() const { return value(); }
241 Iterator(const Iterator&);
242 Iterator& operator=(const Iterator&);
244 // object being iterated over
251 } // namespace jansson