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add object property proxy support

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This commit is contained in:
Sean Middleditch 2010-01-16 01:31:37 -08:00
parent 1bc0225441
commit f0be52f9f8
3 changed files with 56 additions and 7 deletions
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38
janssonxx.h
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@ -22,6 +22,7 @@ namespace jansson {
class Iterator;
class Value;
class _ArrayProxy;
class _ObjectProxy;
// base class for JSON value interface
template <typename _Base>
@ -75,13 +76,20 @@ namespace jansson {
inline _ValueBase<_ArrayProxy> operator[](signed long index);
inline _ValueBase<_ArrayProxy> operator[](unsigned long index);
// get object property
// 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<_ObjectProxy> get(const char* key);
inline _ValueBase<_ObjectProxy> get(const std::string& key);
inline _ValueBase<_ObjectProxy> operator[](const char* key);
inline _ValueBase<_ObjectProxy> operator[](const std::string& key);
// clear all array/object values
inline void clear();
@ -156,9 +164,6 @@ namespace jansson {
// proxies an array element
class _ArrayProxy {
public:
// construct new Value with an undefined value
_ArrayProxy() : _array(0), _index(0) {}
// constructor
_ArrayProxy(json_t* array, unsigned int index) : _array(array), _index(index) {}
@ -176,6 +181,26 @@ namespace jansson {
unsigned int _index;
};
// proxies an object property
class _ObjectProxy {
public:
// constructor
_ObjectProxy(json_t* array, const char* key) : _object(array), _key(key) {}
// assign to the proxied element
inline _ObjectProxy& 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;
};
// represents any JSON value
class Value : public _ValueBase<_Value> {
public:
@ -245,6 +270,11 @@ namespace jansson {
_iter = json_object_iter(_object.as_json());
}
// construct a new iterator for a given object
Iterator(const _ValueBase<_ObjectProxy>& 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);

21
janssonxx.tcc
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@ -45,7 +45,7 @@ jansson::_ValueBase<jansson::_ArrayProxy> jansson::_ValueBase<_Base>::operator[]
template <typename _Base>
jansson::_ValueBase<jansson::_ArrayProxy> jansson::_ValueBase<_Base>::operator[](unsigned long index) { return at(index); }
// get object property
// get object property (const version)
template <typename _Base>
const jansson::Value jansson::_ValueBase<_Base>::get(const char* key) const {
return jansson::Value(json_object_get(_Base::as_json(), key));
@ -58,6 +58,19 @@ const jansson::Value jansson::_ValueBase<_Base>::operator[](const char* key) con
template <typename _Base>
const jansson::Value jansson::_ValueBase<_Base>::operator[](const std::string& key) const { return get(key.c_str()); }
// get object property (non-const version)
template <typename _Base>
jansson::_ValueBase<jansson::_ObjectProxy> jansson::_ValueBase<_Base>::get(const char* key) {
return _ObjectProxy(_Base::as_json(), key);
}
template <typename _Base>
jansson::_ValueBase<jansson::_ObjectProxy> jansson::_ValueBase<_Base>::get(const std::string& key) { return get(key.c_str()); }
template <typename _Base>
jansson::_ValueBase<jansson::_ObjectProxy> jansson::_ValueBase<_Base>::operator[](const char* key) { return get(key); }
template <typename _Base>
jansson::_ValueBase<jansson::_ObjectProxy> jansson::_ValueBase<_Base>::operator[](const std::string& key) { return get(key.c_str()); }
// clear all array/object values
template <typename _Base>
void jansson::_ValueBase<_Base>::clear() {
@ -137,3 +150,9 @@ jansson::_ArrayProxy& jansson::_ArrayProxy::operator=(const Value& value) {
json_array_set(_array, _index, value.as_json());
return *this;
}
// assign value to proxied object property
jansson::_ObjectProxy& jansson::_ObjectProxy::operator=(const Value& value) {
json_object_set(_object, _key, value.as_json());
return *this;
}

4
test.cc
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@ -148,8 +148,8 @@ int main() {
ASSERT_TRUE(e14.is_object(), "e14 is not an object after construction");
e14.set_key("foo", jansson::Value::object());
ASSERT_TRUE(e14["foo"].is_object(), "e14.foo is not an object after assignment");
//e14["foo"]["bar"] = jansson::Value::from(42);
//ASSERT_EQ(e14["foo"]["bar"].as_integer(), 42, "e14.foo.bar has incorrect value after assignment");
e14["foo"]["bar"] = jansson::Value::from(42);
ASSERT_EQ(e14["foo"]["bar"].as_integer(), 42, "e14.foo.bar has incorrect value after assignment");
jansson::Value e15(jansson::Value::array());
ASSERT_TRUE(e15.is_array(), "e15 is not an array after construction");