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

lexical analysis More...

#include <lexer.hpp>

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
 
lexeroperator= (lexer &)=delete
 
constexpr number_integer_t get_number_integer () const noexcept
 return integer value
 
constexpr number_unsigned_t get_number_unsigned () const noexcept
 return unsigned integer value
 
constexpr number_float_t get_number_float () const noexcept
 return floating-point value
 
std::string move_string ()
 return current string value (implicitly resets the token; useful only once)
 
constexpr std::size_t get_position () const noexcept
 return position of last read token
 
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
 
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)
 

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

◆ 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.


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