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/*
MIT License
Copyright (c) 2022 Jason Turner
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/*
*
* @file
*
* @brief Adapter implementation for the json2cpp json parser library.
*
* Include this file in your program to enable support for json2cpp json.
*
* This file defines the following classes (not in this order):
* - json2cppJsonAdapter
* - json2cppJsonArray
* - json2cppJsonValueIterator
* - json2cppJsonFrozenValue
* - json2cppJsonObject
* - json2cppJsonObjectMember
* - json2cppJsonObjectMemberIterator
* - json2cppJsonValue
*
* Due to the dependencies that exist between these classes, the ordering of
* class declarations and definitions may be a bit confusing. The best place to
* start is json2cppJsonAdapter. This class definition is actually very small,
* since most of the functionality is inherited from the BasicAdapter class.
* Most of the classes in this file are provided as template arguments to the
* inherited BasicAdapter class.
*/
#
pragma
once
#
include
"
json2cpp.hpp
"
#
include
<
string
>
#
include
<
utility
>
#
include
<
valijson/exceptions.hpp
>
#
include
<
valijson/internal/adapter.hpp
>
#
include
<
valijson/internal/basic_adapter.hpp
>
#
include
<
valijson/internal/frozen_value.hpp
>
namespace
valijson
{
namespace
adapters
{
class
json2cppJsonAdapter
;
class
json2cppJsonArrayValueIterator
;
class
json2cppJsonObjectMemberIterator
;
typedef
std::pair<std::string, json2cppJsonAdapter> json2cppJsonObjectMember;
/*
*
* @brief Light weight wrapper for a json2cppJson array value.
*
* This class is light weight wrapper for a json2cppJson array. It provides a
* minimum set of container functions and typedefs that allow it to be used as
* an iterable container.
*
* An instance of this class contains a single reference to the underlying
* json2cppJson value, assumed to be an array, so there is very little overhead
* associated with copy construction and passing by value.
*/
class
json2cppJsonArray
{
public:
typedef
json2cppJsonArrayValueIterator const_iterator;
typedef
json2cppJsonArrayValueIterator iterator;
//
/ Construct a json2cppJsonArray referencing an empty array.
json2cppJsonArray
() : m_value(emptyArray()) {}
/*
*
* @brief Construct a json2cppJsonArray referencing a specific json2cppJson
* value.
*
* @param value reference to a json2cppJson value
*
* Note that this constructor will throw an exception if the value is not
* an array.
*/
explicit
json2cppJsonArray
(
const
json2cpp::json &value) : m_value(value)
{
if
(!value.
is_array
()) {
throwRuntimeError
(
"
Value is not an array.
"
); }
}
/*
*
* @brief Return an iterator for the first element of the array.
*
* The iterator return by this function is effectively the iterator
* returned by the underlying json2cppJson implementation.
*/
json2cppJsonArrayValueIterator
begin
()
const
;
/*
*
* @brief Return an iterator for one-past the last element of the array.
*
* The iterator return by this function is effectively the iterator
* returned by the underlying json2cppJson implementation.
*/
json2cppJsonArrayValueIterator
end
()
const
;
//
/ Return the number of elements in the array
size_t
size
()
const
{
return
m_value.
size
(); }
private:
/*
*
* @brief Return a reference to a json2cppJson value that is an empty array.
*
* Note that the value returned by this function is a singleton.
*/
static
const
json2cpp::json &
emptyArray
()
{
static
const
json2cpp::json array =
json2cpp::json::array
();
return
array;
}
//
/ Reference to the contained value
const
json2cpp::json &m_value;
};
/*
*
* @brief Light weight wrapper for a json2cppJson object.
*
* This class is light weight wrapper for a json2cppJson object. It provides a
* minimum set of container functions and typedefs that allow it to be used as
* an iterable container.
*
* An instance of this class contains a single reference to the underlying
* json2cppJson value, assumed to be an object, so there is very little overhead
* associated with copy construction and passing by value.
*/
class
json2cppJsonObject
{
public:
typedef
json2cppJsonObjectMemberIterator const_iterator;
typedef
json2cppJsonObjectMemberIterator iterator;
//
/ Construct a json2cppJsonObject referencing an empty object singleton.
json2cppJsonObject
() : m_value(emptyObject()) {}
/*
*
* @brief Construct a json2cppJsonObject referencing a specific json2cppJson
* value.
*
* @param value reference to a json2cppJson value
*
* Note that this constructor will throw an exception if the value is not
* an object.
*/
explicit
json2cppJsonObject
(
const
json2cpp::json &value) : m_value(value)
{
if
(!value.
is_object
()) {
throwRuntimeError
(
"
Value is not an object.
"
); }
}
/*
*
* @brief Return an iterator for this first object member
*
* The iterator return by this function is effectively a wrapper around
* the iterator value returned by the underlying json2cppJson implementation.
*/
json2cppJsonObjectMemberIterator
begin
()
const
;
/*
*
* @brief Return an iterator for an invalid object member that indicates
* the end of the collection.
*
* The iterator return by this function is effectively a wrapper around
* the iterator value returned by the underlying json2cppJson implementation.
*/
json2cppJsonObjectMemberIterator
end
()
const
;
/*
*
* @brief Return an iterator for the object member with the specified
* property name.
*
* If an object member with the specified name does not exist, the iterator
* returned will be the same as the iterator returned by the end() function.
*
* @param propertyName property name to search for
*/
json2cppJsonObjectMemberIterator
find
(
const
std::string_view propertyName)
const
;
//
/ Returns the number of members belonging to this object.
size_t
size
()
const
{
return
m_value.
size
(); }
private:
/*
*
* @brief Return a reference to a json2cppJson value that is empty object.
*
* Note that the value returned by this function is a singleton.
*/
static
const
json2cpp::json &
emptyObject
()
{
static
const
json2cpp::json object =
json2cpp::json::object
();
return
object;
}
//
/ Reference to the contained object
const
json2cpp::json &m_value;
};
/*
*
* @brief Stores an independent copy of a json2cppJson value.
*
* This class allows a json2cppJson value to be stored independent of its original
* document. json2cppJson makes this easy to do, as it does not perform any
* custom memory management.
*
* @see FrozenValue
*/
class
json2cppJsonFrozenValue
:
public
FrozenValue
{
public:
/*
*
* @brief Make a copy of a json2cppJson value
*
* @param source the json2cppJson value to be copied
*/
explicit
json2cppJsonFrozenValue
(json2cpp::json source) : m_value(std::move(source)) {}
FrozenValue *
clone
()
const
override
{
return
new
json2cppJsonFrozenValue
(m_value); }
bool
equalTo
(
const
Adapter &other,
bool
strict)
const
override
;
private:
//
/ Stored json2cppJson value
json2cpp::json m_value;
};
/*
*
* @brief Light weight wrapper for a json2cppJson value.
*
* This class is passed as an argument to the BasicAdapter template class,
* and is used to provide access to a json2cppJson value. This class is responsible
* for the mechanics of actually reading a json2cppJson value, whereas the
* BasicAdapter class is responsible for the semantics of type comparisons
* and conversions.
*
* The functions that need to be provided by this class are defined implicitly
* by the implementation of the BasicAdapter template class.
*
* @see BasicAdapter
*/
class
json2cppJsonValue
{
public:
//
/ Construct a wrapper for the empty object singleton
json2cppJsonValue
() : m_value(emptyObject()) {}
//
/ Construct a wrapper for a specific json2cppJson value
explicit
json2cppJsonValue
(
const
json2cpp::json &value) : m_value(value) {}
/*
*
* @brief Create a new json2cppJsonFrozenValue instance that contains the
* value referenced by this json2cppJsonValue instance.
*
* @returns pointer to a new json2cppJsonFrozenValue instance, belonging to the
* caller.
*/
FrozenValue *
freeze
()
const
{
return
new
json2cppJsonFrozenValue
(m_value); }
/*
*
* @brief Optionally return a json2cppJsonArray instance.
*
* If the referenced json2cppJson value is an array, this function will return
* a std::optional containing a json2cppJsonArray instance referencing the
* array.
*
* Otherwise it will return an empty optional.
*/
opt::optional<json2cppJsonArray>
getArrayOptional
()
const
{
if
(m_value.
is_array
()) {
return
opt::make_optional
(
json2cppJsonArray
(m_value)); }
return
{};
}
/*
*
* @brief Retrieve the number of elements in the array
*
* If the referenced json2cppJson value is an array, this function will
* retrieve the number of elements in the array and store it in the output
* variable provided.
*
* @param result reference to size_t to set with result
*
* @returns true if the number of elements was retrieved, false otherwise.
*/
bool
getArraySize
(
size_t
&result)
const
{
if
(m_value.
is_array
()) {
result = m_value.
size
();
return
true
;
}
return
false
;
}
bool
getBool
(
bool
&result)
const
{
if
(m_value.
is_boolean
()) {
result = m_value.
get
<
bool
>();
return
true
;
}
return
false
;
}
bool
getDouble
(
double
&result)
const
{
if
(m_value.
is_number_float
()) {
result = m_value.
get
<
double
>();
return
true
;
}
return
false
;
}
bool
getInteger
(
int64_t
&result)
const
{
if
(m_value.
is_number_integer
()) {
result = m_value.
get
<
int64_t
>();
return
true
;
}
return
false
;
}
/*
*
* @brief Optionally return a json2cppJsonObject instance.
*
* If the referenced json2cppJson value is an object, this function will return a
* std::optional containing a json2cppJsonObject instance referencing the
* object.
*
* Otherwise it will return an empty optional.
*/
opt::optional<json2cppJsonObject>
getObjectOptional
()
const
{
if
(m_value.
is_object
()) {
return
opt::make_optional
(
json2cppJsonObject
(m_value)); }
opt::optional<json2cppJsonObject> emptyreturn{};
return
emptyreturn;
}
/*
*
* @brief Retrieve the number of members in the object
*
* If the referenced json2cppJson value is an object, this function will
* retrieve the number of members in the object and store it in the output
* variable provided.
*
* @param result reference to size_t to set with result
*
* @returns true if the number of members was retrieved, false otherwise.
*/
bool
getObjectSize
(
size_t
&result)
const
{
if
(m_value.
is_object
()) {
result = m_value.
size
();
return
true
;
}
return
false
;
}
bool
getString
(std::string &result)
const
{
if
(m_value.
is_string
()) {
result = m_value.
get
<std::string_view>();
return
true
;
}
return
false
;
}
static
bool
hasStrictTypes
() {
return
true
; }
bool
isArray
()
const
{
return
m_value.
is_array
(); }
bool
isBool
()
const
{
return
m_value.
is_boolean
(); }
bool
isDouble
()
const
{
return
m_value.
is_number_float
(); }
bool
isInteger
()
const
{
return
m_value.
is_number_integer
(); }
bool
isNull
()
const
{
return
m_value.
is_null
(); }
bool
isNumber
()
const
{
return
m_value.
is_number
(); }
bool
isObject
()
const
{
return
m_value.
is_object
(); }
bool
isString
()
const
{
return
m_value.
is_string
(); }
private:
//
/ Return a reference to an empty object singleton
static
const
json2cpp::json &
emptyObject
()
{
static
const
json2cpp::json object =
json2cpp::json::object
();
return
object;
}
//
/ Reference to the contained json2cppJson value.
const
json2cpp::json &m_value;
};
/*
*
* @brief An implementation of the Adapter interface supporting json2cppJson.
*
* This class is defined in terms of the BasicAdapter template class, which
* helps to ensure that all of the Adapter implementations behave consistently.
*
* @see Adapter
* @see BasicAdapter
*/
class
json2cppJsonAdapter
: public BasicAdapter<json2cppJsonAdapter,
json2cppJsonArray,
json2cppJsonObjectMember,
json2cppJsonObject,
json2cppJsonValue>
{
public:
//
/ Construct a json2cppJsonAdapter that contains an empty object
json2cppJsonAdapter
() : BasicAdapter() {}
//
/ Construct a json2cppJsonAdapter containing a specific json2cpp Json object
explicit
json2cppJsonAdapter
(
const
json2cpp::json &value) : BasicAdapter(json2cppJsonValue{ value }) {}
};
/*
*
* @brief Class for iterating over values held in a JSON array.
*
* This class provides a JSON array iterator that dereferences as an instance of
* json2cppJsonAdapter representing a value stored in the array. It has been
* implemented using the boost iterator_facade template.
*
* @see json2cppJsonArray
*/
class
json2cppJsonArrayValueIterator
{
public:
using
iterator_category = std::bidirectional_iterator_tag;
using
value_type = json2cppJsonAdapter;
using
difference_type = json2cppJsonAdapter;
using
pointer = json2cppJsonAdapter *;
using
reference = json2cppJsonAdapter &;
/*
*
* @brief Construct a new json2cppJsonArrayValueIterator using an existing
* json2cppJson iterator.
*
* @param itr json2cppJson iterator to store
*/
explicit
json2cppJsonArrayValueIterator
(
const
json2cpp::json::const_iterator &itr) : m_itr(itr) {}
//
/ Returns a json2cppJsonAdapter that contains the value of the current
//
/ element.
json2cppJsonAdapter
operator
*()
const
{
return
json2cppJsonAdapter
(*m_itr); }
DerefProxy<json2cppJsonAdapter>
operator
->()
const
{
return
DerefProxy<json2cppJsonAdapter>(**
this
); }
/*
*
* @brief Compare this iterator against another iterator.
*
* Note that this directly compares the iterators, not the underlying
* values, and assumes that two identical iterators will point to the same
* underlying object.
*
* @param other iterator to compare against
*
* @returns true if the iterators are equal, false otherwise.
*/
bool
operator
==(
const
json2cppJsonArrayValueIterator &other)
const
{
return
m_itr == other.
m_itr
; }
bool
operator
!=(
const
json2cppJsonArrayValueIterator &other)
const
{
return
!(m_itr == other.
m_itr
); }
//
cppcheck-suppress functionConst
const
json2cppJsonArrayValueIterator &
operator
++()
{
++m_itr;
return
*
this
;
}
//
cppcheck-suppress functionConst
json2cppJsonArrayValueIterator
operator
++(
int
)
{
json2cppJsonArrayValueIterator
iterator_pre
(m_itr);
++(*
this
);
return
iterator_pre;
}
//
cppcheck-suppress functionConst
const
json2cppJsonArrayValueIterator &
operator
--()
{
--m_itr;
return
*
this
;
}
//
cppcheck-suppress functionStatic
void
advance
(std::
ptrdiff_t
n) { m_itr += n; }
private:
json2cpp::json::const_iterator m_itr;
};
/*
*
* @brief Class for iterating over the members belonging to a JSON object.
*
* This class provides a JSON object iterator that dereferences as an instance
* of json2cppJsonObjectMember representing one of the members of the object. It
* has been implemented using the boost iterator_facade template.
*
* @see json2cppJsonObject
* @see json2cppJsonObjectMember
*/
class
json2cppJsonObjectMemberIterator
{
public:
using
iterator_category = std::bidirectional_iterator_tag;
using
value_type = json2cppJsonObjectMember;
using
difference_type = json2cppJsonObjectMember;
using
pointer = json2cppJsonObjectMember *;
using
reference = json2cppJsonObjectMember &;
/*
*
* @brief Construct an iterator from a json2cppJson iterator.
*
* @param itr json2cppJson iterator to store
*/
explicit
json2cppJsonObjectMemberIterator
(
const
json2cpp::json::const_iterator &itr) : m_itr(itr) {}
/*
*
* @brief Returns a json2cppJsonObjectMember that contains the key and value
* belonging to the object member identified by the iterator.
*/
json2cppJsonObjectMember
operator
*()
const
{
return
json2cppJsonObjectMember
(m_itr.
key
(), m_itr.
value
()); }
DerefProxy<json2cppJsonObjectMember>
operator
->()
const
{
return
DerefProxy<json2cppJsonObjectMember>(**
this
); }
/*
*
* @brief Compare this iterator with another iterator.
*
* Note that this directly compares the iterators, not the underlying
* values, and assumes that two identical iterators will point to the same
* underlying object.
*
* @param other Iterator to compare with
*
* @returns true if the underlying iterators are equal, false otherwise
*/
bool
operator
==(
const
json2cppJsonObjectMemberIterator &other)
const
{
return
m_itr == other.
m_itr
; }
bool
operator
!=(
const
json2cppJsonObjectMemberIterator &other)
const
{
return
!(m_itr == other.
m_itr
); }
//
cppcheck-suppress functionConst
const
json2cppJsonObjectMemberIterator &
operator
++()
{
++m_itr;
return
*
this
;
}
//
cppcheck-suppress functionConst
json2cppJsonObjectMemberIterator
operator
++(
int
)
{
json2cppJsonObjectMemberIterator
iterator_pre
(m_itr);
++(*
this
);
return
iterator_pre;
}
//
cppcheck-suppress functionConst
const
json2cppJsonObjectMemberIterator &
operator
--()
{
--m_itr;
return
*
this
;
}
private:
//
/ Iternal copy of the original json2cppJson iterator
json2cpp::json::const_iterator m_itr;
};
//
/ Specialisation of the AdapterTraits template struct for json2cppJsonAdapter.
template
<>
struct
AdapterTraits
<valijson::adapters::json2cppJsonAdapter>
{
typedef
json2cpp::json DocumentType;
static
std::string
adapterName
() {
return
"
json2cppJsonAdapter
"
; }
};
inline
bool
json2cppJsonFrozenValue::equalTo
(
const
Adapter &other,
bool
strict)
const
{
return
json2cppJsonAdapter
(m_value).
equalTo
(other, strict);
}
inline
json2cppJsonArrayValueIterator
json2cppJsonArray::begin
()
const
{
return
json2cppJsonArrayValueIterator{ m_value.
begin
() };
}
inline
json2cppJsonArrayValueIterator
json2cppJsonArray::end
()
const
{
return
json2cppJsonArrayValueIterator{ m_value.
end
() };
}
inline
json2cppJsonObjectMemberIterator
json2cppJsonObject::begin
()
const
{
return
json2cppJsonObjectMemberIterator{ m_value.
begin
() };
}
inline
json2cppJsonObjectMemberIterator
json2cppJsonObject::end
()
const
{
return
json2cppJsonObjectMemberIterator{ m_value.
end
() };
}
inline
json2cppJsonObjectMemberIterator
json2cppJsonObject::find
(
const
std::string_view propertyName)
const
{
return
json2cppJsonObjectMemberIterator{ m_value.
find
(propertyName) };
}
}
//
namespace adapters
}
//
namespace valijson
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