Serializes an inspectable object to a JSON-formatted string. More...

#include <json_writer.hpp>

Inheritance diagram for caf::json_writer:

Public Types
enum class	type : uint8_t { element , object , member , key , array , string , number , boolean , null }
	Reflects the structure of JSON objects according to ECMA-404. More...

using	super = serializer

Public Types inherited from caf::serializer
using	super = save_inspector_base< serializer >

Public Member Functions
	json_writer (actor_system &sys)

	json_writer (execution_unit *ctx)

string_view	str () const noexcept
	Returns a string view into the internal buffer.

size_t	indentation () const noexcept
	Returns the current indentation factor.

void	indentation (size_t factor) noexcept
	Sets the indentation level.

bool	compact () const noexcept
	Returns whether the writer generates compact JSON output without any spaces or newlines to separate values.

bool	skip_empty_fields () const noexcept
	Returns whether the writer omits empty fields entirely (true) or renders empty fields as `$field: null` (false).

void	skip_empty_fields (bool value) noexcept
	Configures whether the writer omits empty fields.

string_view	field_type_suffix () const noexcept
	Returns the suffix for generating type annotation fields for variant fields.

void	field_type_suffix (string_view suffix) noexcept
	Configures whether the writer omits empty fields.

void	reset ()
	Removes all characters from the buffer and restores the writer to its initial state.

bool	begin_object (type_id_t type, string_view name) override
	Begins processing of an object.

bool	end_object () override
	Ends processing of an object.

bool	begin_field (string_view) override

bool	begin_field (string_view name, bool is_present) override

bool	begin_field (string_view name, span< const type_id_t > types, size_t index) override

bool	begin_field (string_view name, bool is_present, span< const type_id_t > types, size_t index) override

bool	end_field () override

bool	begin_tuple (size_t size) override
	Begins processing of a tuple.

bool	end_tuple () override
	Ends processing of a tuple.

bool	begin_key_value_pair () override
	Begins processing of a tuple with two elements, whereas the first element represents the key in an associative array.

bool	end_key_value_pair () override
	Ends processing of a key-value pair after both values were written.

bool	begin_sequence (size_t size) override
	Begins processing of a sequence. Saves the size to the underlying storage.

bool	end_sequence () override
	Ends processing of a sequence.

bool	begin_associative_array (size_t size) override
	Begins processing of an associative array (map).

bool	end_associative_array () override
	Ends processing of an associative array (map).

bool	value (byte x) override
	Adds `x` to the output.

bool	value (bool x) override
	Adds `x` to the output.

bool	value (int8_t x) override
	Adds `x` to the output.

bool	value (uint8_t x) override
	Adds `x` to the output.

bool	value (int16_t x) override
	Adds `x` to the output.

bool	value (uint16_t x) override
	Adds `x` to the output.

bool	value (int32_t x) override
	Adds `x` to the output.

bool	value (uint32_t x) override
	Adds `x` to the output.

bool	value (int64_t x) override
	Adds `x` to the output.

bool	value (uint64_t x) override
	Adds `x` to the output.

bool	value (float x) override
	Adds `x` to the output.

bool	value (double x) override
	Adds `x` to the output.

bool	value (long double x) override
	Adds `x` to the output.

bool	value (string_view x) override
	Adds `x` to the output.

bool	value (const std::u16string &x) override
	Adds `x` to the output.

bool	value (const std::u32string &x) override
	Adds `x` to the output.

bool	value (span< const byte > x) override
	Adds `x` as raw byte block to the output.

Public Member Functions inherited from caf::serializer
	serializer (actor_system &sys) noexcept

	serializer (execution_unit *ctx=nullptr) noexcept

auto	context () const noexcept

bool	has_human_readable_format () const noexcept

virtual bool	begin_object (type_id_t type, string_view name)=0
	Begins processing of an object.

virtual bool	end_object ()=0
	Ends processing of an object.

virtual bool	begin_field (string_view)=0

virtual bool	begin_field (string_view name, bool is_present)=0

virtual bool	begin_field (string_view name, span< const type_id_t > types, size_t index)=0

virtual bool	begin_field (string_view name, bool is_present, span< const type_id_t > types, size_t index)=0

virtual bool	end_field ()=0

virtual bool	begin_tuple (size_t size)=0
	Begins processing of a tuple.

virtual bool	end_tuple ()=0
	Ends processing of a tuple.

virtual bool	begin_key_value_pair ()
	Begins processing of a tuple with two elements, whereas the first element represents the key in an associative array.

virtual bool	end_key_value_pair ()
	Ends processing of a key-value pair after both values were written.

virtual bool	begin_sequence (size_t size)=0
	Begins processing of a sequence. Saves the size to the underlying storage.

virtual bool	end_sequence ()=0
	Ends processing of a sequence.

virtual bool	begin_associative_array (size_t size)
	Begins processing of an associative array (map).

virtual bool	end_associative_array ()
	Ends processing of an associative array (map).

virtual bool	value (byte x)=0
	Adds `x` to the output.

virtual bool	value (bool x)=0
	Adds `x` to the output.

virtual bool	value (int8_t x)=0
	Adds `x` to the output.

virtual bool	value (uint8_t x)=0
	Adds `x` to the output.

virtual bool	value (int16_t x)=0
	Adds `x` to the output.

virtual bool	value (uint16_t x)=0
	Adds `x` to the output.

virtual bool	value (int32_t x)=0
	Adds `x` to the output.

virtual bool	value (uint32_t x)=0
	Adds `x` to the output.

virtual bool	value (int64_t x)=0
	Adds `x` to the output.

virtual bool	value (uint64_t x)=0
	Adds `x` to the output.

template<class T >
std::enable_if_t< std::is_integral< T >::value, bool >	value (T x)
	Adds `x` to the output.

virtual bool	value (float x)=0
	Adds `x` to the output.

virtual bool	value (double x)=0
	Adds `x` to the output.

virtual bool	value (long double x)=0
	Adds `x` to the output.

virtual bool	value (string_view x)=0
	Adds `x` to the output.

virtual bool	value (const std::u16string &x)=0
	Adds `x` to the output.

virtual bool	value (const std::u32string &x)=0
	Adds `x` to the output.

virtual bool	value (span< const byte > x)=0
	Adds `x` as raw byte block to the output.

virtual bool	list (const std::vector< bool > &xs)
	Adds each boolean in `xs` to the output.

Static Public Attributes
static constexpr bool	skip_empty_fields_default = true
	The default value for `skip_empty_fields()`.

static constexpr string_view	field_type_suffix_default = "-type"
	The value value for `field_type_suffix()`.

Additional Inherited Members
Protected Attributes inherited from caf::serializer
execution_unit *	context_
	Provides access to the ::proxy_registry and to the ::actor_system.

bool	has_human_readable_format_ = false
	Configures whether client code should assume human-readable output.

Detailed Description

Serializes an inspectable object to a JSON-formatted string.

Member Enumeration Documentation

◆ type

enum class caf::json_writer::type : uint8_t

strong

Reflects the structure of JSON objects according to ECMA-404.

This enum skips types such as members or value since they are not needed to generate JSON.

Enumerator
object	Can morph into any other type except `member`.
member	Contains any number of members.
key	A single key-value pair.
array	The key of a field.
string	Contains any number of elements.
number	A character sequence (terminal type).
boolean	An integer or floating point (terminal type).
null	Either "true" or "false" (terminal type).

Member Function Documentation

◆ begin_associative_array()

bool caf::json_writer::begin_associative_array ( size_t size )

overridevirtual

Begins processing of an associative array (map).

Note: the default implementation calls begin_sequence(size).

Reimplemented from caf::serializer.

◆ begin_field() [1/4]

bool caf::json_writer::begin_field	(	string_view	name,
		bool	is_present
	)

overridevirtual

Implements caf::serializer.

◆ begin_field() [2/4]

bool caf::json_writer::begin_field	(	string_view	name,
		bool	is_present,
		span< const type_id_t >	types,
		size_t	index
	)

overridevirtual

Implements caf::serializer.

◆ begin_field() [3/4]

bool caf::json_writer::begin_field	(	string_view	name,
		span< const type_id_t >	types,
		size_t	index
	)

overridevirtual

Implements caf::serializer.

◆ begin_field() [4/4]

bool caf::json_writer::begin_field ( string_view )

overridevirtual

Implements caf::serializer.

◆ begin_key_value_pair()

bool caf::json_writer::begin_key_value_pair ( )

overridevirtual

Begins processing of a tuple with two elements, whereas the first element represents the key in an associative array.

Note: the default implementation calls begin_tuple(2).

Reimplemented from caf::serializer.

◆ begin_object()

bool caf::json_writer::begin_object	(	type_id_t	type,
		string_view	name
	)

overridevirtual

Begins processing of an object.

May save the type information to the underlying storage to allow a deserializer to retrieve and check the type information for data formats that provide deserialization.

Implements caf::serializer.

◆ begin_sequence()

bool caf::json_writer::begin_sequence ( size_t size )

overridevirtual

Begins processing of a sequence. Saves the size to the underlying storage.

Implements caf::serializer.

◆ begin_tuple()

bool caf::json_writer::begin_tuple ( size_t size )

overridevirtual

Begins processing of a tuple.

Implements caf::serializer.

◆ end_associative_array()

bool caf::json_writer::end_associative_array ( )

overridevirtual

Ends processing of an associative array (map).

Note: the default implementation calls end_sequence().

Reimplemented from caf::serializer.

◆ end_field()

bool caf::json_writer::end_field ( )

overridevirtual

Implements caf::serializer.

◆ end_key_value_pair()

bool caf::json_writer::end_key_value_pair ( )

overridevirtual

Ends processing of a key-value pair after both values were written.

Note: the default implementation calls end_tuple().

Reimplemented from caf::serializer.

◆ end_object()

bool caf::json_writer::end_object ( )

overridevirtual

Ends processing of an object.

Implements caf::serializer.

◆ end_sequence()

bool caf::json_writer::end_sequence ( )

overridevirtual

Ends processing of a sequence.

Implements caf::serializer.

◆ end_tuple()

bool caf::json_writer::end_tuple ( )

overridevirtual

Ends processing of a tuple.

Implements caf::serializer.

◆ field_type_suffix()

string_view caf::json_writer::field_type_suffix ( ) const

noexcept

Returns the suffix for generating type annotation fields for variant fields.

For example, CAF inserts field called "@foo${field_type_suffix}" for a variant field called "foo".

◆ indentation()

void caf::json_writer::indentation ( size_t factor )

noexcept

Sets the indentation level.

Parameters

factor The number of spaces to add to each level of indentation. A value of 0 (the default) disables indentation, printing the entire JSON output into a single line.

◆ reset()

void caf::json_writer::reset ( )

Removes all characters from the buffer and restores the writer to its initial state.

Warning: Invalidates all string views into the buffer.

◆ str()

string_view caf::json_writer::str ( ) const

noexcept

Returns a string view into the internal buffer.

Warning: This view becomes invalid when calling any non-const member function on the writer object.

◆ value() [1/17]

bool caf::json_writer::value ( bool x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [2/17]

bool caf::json_writer::value ( byte x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [3/17]

bool caf::json_writer::value ( const std::u16string & x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [4/17]

bool caf::json_writer::value ( const std::u32string & x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [5/17]

bool caf::json_writer::value ( double x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [6/17]

bool caf::json_writer::value ( float x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [7/17]

bool caf::json_writer::value ( int16_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [8/17]

bool caf::json_writer::value ( int32_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [9/17]

bool caf::json_writer::value ( int64_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [10/17]

bool caf::json_writer::value ( int8_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [11/17]

bool caf::json_writer::value ( long double x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [12/17]

bool caf::json_writer::value ( span< const byte > x )

overridevirtual

Adds x as raw byte block to the output.

Parameters

x	The byte sequence.

Returns: A non-zero error code on failure, sec::success otherwise.

Implements caf::serializer.

◆ value() [13/17]

bool caf::json_writer::value ( string_view x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [14/17]

bool caf::json_writer::value ( uint16_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [15/17]

bool caf::json_writer::value ( uint32_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [16/17]

bool caf::json_writer::value ( uint64_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

◆ value() [17/17]

bool caf::json_writer::value ( uint8_t x )

overridevirtual

Adds x to the output.

Parameters

x	A value for a builtin type.

Returns: true on success, false otherwise.

Implements caf::serializer.

The documentation for this class was generated from the following file:

libcaf_core/caf/json_writer.hpp

Public Types

Public Member Functions

Static Public Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ type

Member Function Documentation

◆ begin_associative_array()

◆ begin_field() [1/4]

◆ begin_field() [2/4]

◆ begin_field() [3/4]

◆ begin_field() [4/4]

◆ begin_key_value_pair()

◆ begin_object()

◆ begin_sequence()

◆ begin_tuple()

◆ end_associative_array()

◆ end_field()

◆ end_key_value_pair()

◆ end_object()

◆ end_sequence()

◆ end_tuple()

◆ field_type_suffix()

◆ indentation()

◆ reset()

◆ str()

◆ value() [1/17]

◆ value() [2/17]

◆ value() [3/17]

◆ value() [4/17]

◆ value() [5/17]

◆ value() [6/17]

◆ value() [7/17]

◆ value() [8/17]

◆ value() [9/17]

◆ value() [10/17]

◆ value() [11/17]

◆ value() [12/17]

◆ value() [13/17]

◆ value() [14/17]

◆ value() [15/17]

◆ value() [16/17]

◆ value() [17/17]