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Niels 2015-06-25 00:40:16 +02:00
parent 5bad95f48e
commit 3ffedea5c4
7 changed files with 339 additions and 46 deletions
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30
doc/examples/operatorarray__key_type.cpp Normal file
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@ -0,0 +1,30 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON object
json object =
{
{"one", 1}, {"two", 2}, {"three", 2.9}
};
// output element with key "two"
std::cout << object["two"] << "\n\n";
// change element with key "three"
object["three"] = 3;
// output changed array
std::cout << std::setw(4) << object << "\n\n";
// mention nonexisting key
object["four"];
// write to nonexisting key
object["five"]["really"]["nested"] = true;
// output changed object
std::cout << std::setw(4) << object << '\n';
}

19
doc/examples/operatorarray__key_type.output Normal file
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@ -0,0 +1,19 @@
2
{
"one": 1,
"three": 3,
"two": 2
}
{
"five": {
"really": {
"nested": true
}
},
"four": null,
"one": 1,
"three": 3,
"two": 2
}

15
doc/examples/operatorarray__key_type_const.cpp Normal file
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@ -0,0 +1,15 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON object
json object =
{
{"one", 1}, {"two", 2}, {"three", 2.9}
};
// output element with key "two"
std::cout << object["two"] << '\n';
}

1
doc/examples/operatorarray__key_type_const.output Normal file
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@ -0,0 +1 @@
2

125
src/json.hpp
View file

@ -120,7 +120,6 @@ template <
>
class basic_json
{
public:
/////////////////////
// container types //
/////////////////////
@ -128,9 +127,12 @@ class basic_json
/// @name container types
/// @{
private:
/// workaround type for MSVC
using __basic_json =
basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType>;
public:
/// the type of elements in a basic_json container
using value_type = basic_json;
@ -208,8 +210,10 @@ class basic_json
/*!
@brief the JSON value type enumeration
This enumeration collects the different JSON value types. It is used to
distinguish the stored values in the union @ref json_value.
This enumeration collects the different JSON value types. It is internally
used to distinguish the stored values, and the functions is_null,
is_object, is_array, is_string, is_boolean, is_number, and is_discarded
rely on it.
*/
enum class value_t : uint8_t
{
@ -224,6 +228,7 @@ class basic_json
};
private:
////////////////////////
// JSON value storage //
////////////////////////
@ -332,6 +337,8 @@ class basic_json
}
};
public:
//////////////////////////
// JSON parser callback //
//////////////////////////
@ -462,7 +469,7 @@ class basic_json
@complexity Constant.
@throw std::bad_alloc if allocation for object, array, or string value
fails (thrown by the constructors of @ref json_value)
fails
@liveexample{The following code shows the constructor for different @ref
value_t values,basic_json__value_t}
@ -520,8 +527,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for object value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for object value fails
@liveexample{The following code shows the constructor with an @ref object_t
parameter.,basic_json__object_t}
@ -546,8 +552,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for object value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for object value fails
@liveexample{The following code shows the constructor with several
compatible object type parameters.,basic_json__CompatibleObjectType}
@ -578,8 +583,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for array value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for array value fails
@liveexample{The following code shows the constructor with an @ref array_t
parameter.,basic_json__array_t}
@ -604,8 +608,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for array value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for array value fails
@liveexample{The following code shows the constructor with several
compatible array type parameters.,basic_json__CompatibleArrayType}
@ -641,8 +644,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the constructor with an @ref string_t
parameter.,basic_json__string_t}
@ -663,8 +665,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the constructor with string literal
parameter.,basic_json__string_t_value_type}
@ -688,8 +689,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the construction of a string value
from a compatible type.,basic_json__CompatibleStringType}
@ -1432,7 +1432,14 @@ class basic_json
return ss.str();
}
/// return the type of the object (explicit)
/*!
@brief return the type of the JSON value (explicit)
Return the type of the JSON value as a value from the @ref value_t
enumeration.
@return the type of the JSON value
*/
value_t type() const noexcept
{
return m_type;
@ -2179,7 +2186,26 @@ class basic_json
return m_value.array->operator[](idx);
}
/// access specified element
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note If @a key is not found in the object, then it is silently added to
the object and filled with a `null` value to make `key` a valid reference.
In case the value was `null` before, it is converted to an object.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read and
written using the [] operator.,operatorarray__key_type}
*/
reference operator[](const typename object_t::key_type& key)
{
// implicitly convert null to object
@ -2200,7 +2226,22 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read using
the [] operator.,operatorarray__key_type_const}
*/
const_reference operator[](const typename object_t::key_type& key) const
{
// at only works for objects
@ -2212,7 +2253,28 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element (needed for clang)
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note If @a key is not found in the object, then it is silently added to
the object and filled with a `null` value to make `key` a valid reference.
In case the value was `null` before, it is converted to an object.
@note This function is required for compatibility reasons with Clang.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read and
written using the [] operator.,operatorarray__key_type}
*/
template<typename T, std::size_t n>
reference operator[](const T (&key)[n])
{
@ -2232,7 +2294,24 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element (needed for clang)
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note This function is required for compatibility reasons with Clang.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read using
the [] operator.,operatorarray__key_type_const}
*/
template<typename T, std::size_t n>
const_reference operator[](const T (&key)[n]) const
{

125
src/json.hpp.re2c
View file

@ -120,7 +120,6 @@ template <
>
class basic_json
{
public:
/////////////////////
// container types //
/////////////////////
@ -128,9 +127,12 @@ class basic_json
/// @name container types
/// @{
private:
/// workaround type for MSVC
using __basic_json =
basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType>;
public:
/// the type of elements in a basic_json container
using value_type = basic_json;
@ -208,8 +210,10 @@ class basic_json
/*!
@brief the JSON value type enumeration
This enumeration collects the different JSON value types. It is used to
distinguish the stored values in the union @ref json_value.
This enumeration collects the different JSON value types. It is internally
used to distinguish the stored values, and the functions is_null,
is_object, is_array, is_string, is_boolean, is_number, and is_discarded
rely on it.
*/
enum class value_t : uint8_t
{
@ -224,6 +228,7 @@ class basic_json
};
private:
////////////////////////
// JSON value storage //
////////////////////////
@ -332,6 +337,8 @@ class basic_json
}
};
public:
//////////////////////////
// JSON parser callback //
//////////////////////////
@ -462,7 +469,7 @@ class basic_json
@complexity Constant.
@throw std::bad_alloc if allocation for object, array, or string value
fails (thrown by the constructors of @ref json_value)
fails
@liveexample{The following code shows the constructor for different @ref
value_t values,basic_json__value_t}
@ -520,8 +527,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for object value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for object value fails
@liveexample{The following code shows the constructor with an @ref object_t
parameter.,basic_json__object_t}
@ -546,8 +552,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for object value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for object value fails
@liveexample{The following code shows the constructor with several
compatible object type parameters.,basic_json__CompatibleObjectType}
@ -578,8 +583,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for array value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for array value fails
@liveexample{The following code shows the constructor with an @ref array_t
parameter.,basic_json__array_t}
@ -604,8 +608,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for array value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for array value fails
@liveexample{The following code shows the constructor with several
compatible array type parameters.,basic_json__CompatibleArrayType}
@ -641,8 +644,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the constructor with an @ref string_t
parameter.,basic_json__string_t}
@ -663,8 +665,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the constructor with string literal
parameter.,basic_json__string_t_value_type}
@ -688,8 +689,7 @@ class basic_json
@complexity Linear in the size of the passed @a value.
@throw std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@throw std::bad_alloc if allocation for string value fails
@liveexample{The following code shows the construction of a string value
from a compatible type.,basic_json__CompatibleStringType}
@ -1432,7 +1432,14 @@ class basic_json
return ss.str();
}
/// return the type of the object (explicit)
/*!
@brief return the type of the JSON value (explicit)
Return the type of the JSON value as a value from the @ref value_t
enumeration.
@return the type of the JSON value
*/
value_t type() const noexcept
{
return m_type;
@ -2179,7 +2186,26 @@ class basic_json
return m_value.array->operator[](idx);
}
/// access specified element
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note If @a key is not found in the object, then it is silently added to
the object and filled with a `null` value to make `key` a valid reference.
In case the value was `null` before, it is converted to an object.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read and
written using the [] operator.,operatorarray__key_type}
*/
reference operator[](const typename object_t::key_type& key)
{
// implicitly convert null to object
@ -2200,7 +2226,22 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read using
the [] operator.,operatorarray__key_type_const}
*/
const_reference operator[](const typename object_t::key_type& key) const
{
// at only works for objects
@ -2212,7 +2253,28 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element (needed for clang)
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note If @a key is not found in the object, then it is silently added to
the object and filled with a `null` value to make `key` a valid reference.
In case the value was `null` before, it is converted to an object.
@note This function is required for compatibility reasons with Clang.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read and
written using the [] operator.,operatorarray__key_type}
*/
template<typename T, std::size_t n>
reference operator[](const T (&key)[n])
{
@ -2232,7 +2294,24 @@ class basic_json
return m_value.object->operator[](key);
}
/// access specified element (needed for clang)
/*!
@brief access specified object element
Returns a reference to the element at with specified key @a key.
@note This function is required for compatibility reasons with Clang.
@param[in] key key of the element to access
@return reference to the element at key @a key
@throw std::domain_error if JSON is not an object or null
@complexity Logarithmic in the size of the container.
@liveexample{The example below shows how object elements can be read using
the [] operator.,operatorarray__key_type_const}
*/
template<typename T, std::size_t n>
const_reference operator[](const T (&key)[n]) const
{

70
test/unit.cpp
View file

@ -8953,6 +8953,76 @@ TEST_CASE("compliance tests from nativejson-benchmark")
}
}
TEST_CASE("RFC 7159 examples")
{
// here, we list all JSON values from the RFC 7159 document
SECTION("7. Strings")
{
CHECK(json::parse("\"\\u005C\"") == json("\\"));
CHECK(json::parse("\"\\uD834\\uDD1E\"") == json("𝄞"));
}
SECTION("8.3 String Comparison")
{
CHECK(json::parse("\"a\\b\"") == json::parse("\"a\u005Cb\""));
}
SECTION("13 Examples")
{
{
auto string1 = R"(
{
"Image": {
"Width": 800,
"Height": 600,
"Title": "View from 15th Floor",
"Thumbnail": {
"Url": "http://www.example.com/image/481989943",
"Height": 125,
"Width": 100
},
"Animated" : false,
"IDs": [116, 943, 234, 38793]
}
}
)";
CHECK_NOTHROW(json(string1));
}
{
auto string2 = R"(
[
{
"precision": "zip",
"Latitude": 37.7668,
"Longitude": -122.3959,
"Address": "",
"City": "SAN FRANCISCO",
"State": "CA",
"Zip": "94107",
"Country": "US"
},
{
"precision": "zip",
"Latitude": 37.371991,
"Longitude": -122.026020,
"Address": "",
"City": "SUNNYVALE",
"State": "CA",
"Zip": "94085",
"Country": "US"
}
])";
CHECK_NOTHROW(json(string2));
}
CHECK(json::parse("\"Hello world!\"") == json("Hello world!"));
CHECK(json::parse("42") == json(42));
CHECK(json::parse("true") == json(true));
}
}
TEST_CASE("Unicode", "[hide]")
{
SECTION("full enumeration of Unicode codepoints")