nlohmann::detail::lexer< BasicJsonType > Class Template Reference

lexical analysis More...

Public Types
enum	token_type {   token_type::uninitialized,   token_type::literal_true,   token_type::literal_false,   token_type::literal_null,   token_type::value_string,   token_type::value_unsigned,   token_type::value_integer,   token_type::value_float,   token_type::begin_array,   token_type::begin_object,   token_type::end_array,   token_type::end_object,   token_type::name_separator,   token_type::value_separator,   token_type::parse_error,   token_type::end_of_input,   token_type::literal_or_value }
	token types for the parser More...

Public Member Functions
	lexer (detail::input_adapter_t adapter)
	lexer (const lexer &)=delete
lexer &	operator= (lexer &)=delete
constexpr number_integer_t	get_number_integer () const noexcept
	return integer value More...
constexpr number_unsigned_t	get_number_unsigned () const noexcept
	return unsigned integer value More...
constexpr number_float_t	get_number_float () const noexcept
	return floating-point value More...
std::string	move_string ()
	return current string value (implicitly resets the token; useful only once) More...
constexpr std::size_t	get_position () const noexcept
	return position of last read token More...
std::string	get_token_string () const
	return the last read token (for errors only). More...
constexpr const char *	get_error_message () const noexcept
	return syntax error message More...
token_type	scan ()

Static Public Member Functions
static const char *	token_type_name (const token_type t) noexcept
	return name of values of type token_type (only used for errors) More...

Detailed Description

template<typename BasicJsonType>
class nlohmann::detail::lexer< BasicJsonType >

lexical analysis

This class organizes the lexical analysis during JSON deserialization.

Member Enumeration Documentation

token_type

template<typename BasicJsonType >

enum nlohmann::detail::lexer::token_type

strong

token types for the parser

Enumerator
uninitialized	indicating the scanner is uninitialized
literal_true	the true literal
literal_false	the false literal
literal_null	the null literal
value_string	a string – use get_string() for actual value
value_unsigned	an unsigned integer – use get_number_unsigned() for actual value
value_integer	a signed integer – use get_number_integer() for actual value
value_float	an floating point number – use get_number_float() for actual value
begin_array	the character for array begin [
begin_object	the character for object begin {
end_array	the character for array end ]
end_object	the character for object end }
name_separator	the name separator :
value_separator	the value separator ,
parse_error	indicating a parse error
end_of_input	indicating the end of the input buffer
literal_or_value	a literal or the begin of a value (only for diagnostics)

Member Function Documentation

token_type_name()

template<typename BasicJsonType >

static const char* nlohmann::detail::lexer< BasicJsonType >::token_type_name ( const token_type  t )

inlinestaticnoexcept

return name of values of type token_type (only used for errors)

References nlohmann::detail::lexer< BasicJsonType >::value_float, nlohmann::detail::lexer< BasicJsonType >::value_integer, and nlohmann::detail::lexer< BasicJsonType >::value_unsigned.

get_number_integer()

template<typename BasicJsonType >

constexpr number_integer_t nlohmann::detail::lexer< BasicJsonType >::get_number_integer ( ) const

inlinenoexcept

return integer value

get_number_unsigned()

template<typename BasicJsonType >

constexpr number_unsigned_t nlohmann::detail::lexer< BasicJsonType >::get_number_unsigned ( ) const

inlinenoexcept

return unsigned integer value

get_number_float()

template<typename BasicJsonType >

constexpr number_float_t nlohmann::detail::lexer< BasicJsonType >::get_number_float ( ) const

inlinenoexcept

return floating-point value

move_string()

template<typename BasicJsonType >

std::string nlohmann::detail::lexer< BasicJsonType >::move_string ( )

inline

return current string value (implicitly resets the token; useful only once)

get_position()

template<typename BasicJsonType >

constexpr std::size_t nlohmann::detail::lexer< BasicJsonType >::get_position ( ) const

inlinenoexcept

return position of last read token

get_token_string()

template<typename BasicJsonType >

std::string nlohmann::detail::lexer< BasicJsonType >::get_token_string ( ) const

inline

return the last read token (for errors only).

Will never contain EOF (an arbitrary value that is not a valid char value, often -1), because 255 may legitimately occur. May contain NUL, which should be escaped.

References nlohmann::detail::string.

get_error_message()

template<typename BasicJsonType >

constexpr const char* nlohmann::detail::lexer< BasicJsonType >::get_error_message ( ) const

inlinenoexcept

return syntax error message

References nlohmann::detail::string.