jsoneat.hh File Reference

helper class to iterate the JSMN token array and extract data More...

#include "jsmn/jsmn.h"
#include <iterator>
#include <type_traits>
#include <cstddef>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <string>

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Classes
class	jsoneat::JsoNeat< input_type >
	Parse JSON into tokens and iterate over it. Will handle all allocations. More...
class	jsoneat::JsoNeat< input_type >::Iterator
	This has iterator functionality, but also provides lots of token related member functions. More...
class	jsoneat::JsoNeat_fs< JSON_MAX_TOKENS, input_type >
	Parse JSON into fixed size token array. More...
struct	jsoneat::KvPair< D >
	pair of a reference and a json-key More...

Macros
#define	_JSONEAT_COUNT_N(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, N, ...)   N
#define	_JSONEAT_COUNT(...)   _JSONEAT_COUNT_N( __VA_ARGS__, 10, 9, 8, 7, 6, 5 ,4, 3, 2, 1)
#define	_JSONEAT_BUILD_CHAIN_1(_1)   _JSONEAT_KvPairs_ACT(_1)
#define	_JSONEAT_BUILD_CHAIN_2(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_1(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_3(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_2(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_4(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_3(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_5(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_4(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_6(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_5(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_7(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_6(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_8(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_7(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_9(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_8(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_10(_1, ...)   _JSONEAT_KvPairs_ACT(_1) , _JSONEAT_BUILD_CHAIN_9(__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN_INC(CT, ...)   _JSONEAT_BUILD_CHAIN_ ## CT (__VA_ARGS__)
#define	_JSONEAT_BUILD_CHAIN(CT, ...)   _JSONEAT_BUILD_CHAIN_INC(CT, __VA_ARGS__)
#define	_JSONEAT_KvPairs_ACT(x)   jsoneat::KvPair(#x, x)
#define	JSONEAT_KvPairs(...)   _JSONEAT_BUILD_CHAIN( _JSONEAT_COUNT(__VA_ARGS__), __VA_ARGS__)
	Create argument list of jsoneat::KvPair-pairs, each containg a data-member reference and the corrosponding JSON key with the same name as the data-member \args list of all data-members to be de-serialized.

Typedefs
using	jsoneat::JsonNeat_cp = JsoNeat< char * >
	working on non-const char JSON. this allows null terminating strings in place with get_value_as_string
using	jsoneat::JsonNeat_ccp = JsoNeat< const char * >
	working on const char JSON.

Functions
template<int MaxTokens = 32, typename T , typename S >
bool	jsoneat::from_json_member (T &obj, S json)
	convenient function template to de-serialize from a JSON string (FIXME: should not be in this header)

Detailed Description

helper class to iterate the JSMN token array and extract data

Author

Bert Winkelmann (github.com/zwiebert)

Function Documentation

from_json_member()

template<int MaxTokens = 32, typename T , typename S >

bool jsoneat::from_json_member	(	T &	obj,
		S	json
	)

convenient function template to de-serialize from a JSON string (FIXME: should not be in this header)

Template Parameters

S	Type of JSON string like char *, const char *, std::string, ...
T	Type of object. The object has to have a from_json(jsmn_iter) member function template
MaxTokens	fixed size of JSMN token array (allocated on stack)

Parameters

json	JSON string

Returns

success