RapidJSON error handling

Classes
struct	rapidjson::ParseResult
	Result of parsing (wraps ParseErrorCode) More...

Macros
#define	RAPIDJSON_ERROR_CHARTYPE   char
	Character type of error messages. More...
#define	RAPIDJSON_ERROR_STRING(x)   x
	Macro for converting string literial to RAPIDJSON_ERROR_CHARTYPE[]. More...
#define	RAPIDJSON_PARSE_ERROR_NORETURN(parseErrorCode, offset)
	Macro to indicate a parse error. More...
#define	RAPIDJSON_PARSE_ERROR(parseErrorCode, offset)
	(Internal) macro to indicate and handle a parse error. More...

Typedefs
typedef const RAPIDJSON_ERROR_CHARTYPE *(*	rapidjson::GetParseErrorFunc) (ParseErrorCode)
	Function pointer type of GetParseError(). More...

Enumerations
enum	rapidjson::ParseErrorCode {   rapidjson::kParseErrorNone = 0, rapidjson::kParseErrorDocumentEmpty, rapidjson::kParseErrorDocumentRootNotSingular, rapidjson::kParseErrorValueInvalid,   rapidjson::kParseErrorObjectMissName, rapidjson::kParseErrorObjectMissColon, rapidjson::kParseErrorObjectMissCommaOrCurlyBracket, rapidjson::kParseErrorArrayMissCommaOrSquareBracket,   rapidjson::kParseErrorStringUnicodeEscapeInvalidHex, rapidjson::kParseErrorStringUnicodeSurrogateInvalid, rapidjson::kParseErrorStringEscapeInvalid, rapidjson::kParseErrorStringMissQuotationMark,   rapidjson::kParseErrorStringInvalidEncoding, rapidjson::kParseErrorNumberTooBig, rapidjson::kParseErrorNumberMissFraction, rapidjson::kParseErrorNumberMissExponent,   rapidjson::kParseErrorTermination, rapidjson::kParseErrorUnspecificSyntaxError }
	Error code of parsing. More...

Functions
const RAPIDJSON_ERROR_CHARTYPE *	rapidjson::GetParseError_En (ParseErrorCode parseErrorCode)
	Maps error code of parsing into error message. More...

Detailed Description

---

Class Documentation

struct rapidjson::ParseResult

Result of parsing (wraps ParseErrorCode)

Document doc;
ParseResult ok = doc.Parse("[42]");
if (!ok) {
    fprintf(stderr, "JSON parse error: %s (%u)",
            GetParseError_En(ok.Code()), ok.Offset());
    exit(EXIT_FAILURE);
}

See also

GenericReader::Parse, GenericDocument::Parse

Public Member Functions
	ParseResult ()
	Default constructor, no error.
	ParseResult (ParseErrorCode code, size_t offset)
	Constructor to set an error.
ParseErrorCode	Code () const
	Get the error code.
size_t	Offset () const
	Get the error offset, if IsError(), 0 otherwise.
	operator bool () const
	Conversion to bool, returns true, iff !IsError().
bool	IsError () const
	Whether the result is an error.
bool	operator== (const ParseResult &that) const
bool	operator== (ParseErrorCode code) const
void	Clear ()
	Reset error code.
void	Set (ParseErrorCode code, size_t offset=0)
	Update error code and offset.
Friends
bool	operator== (ParseErrorCode code, const ParseResult &err)

Macro Definition Documentation

#define RAPIDJSON_ERROR_CHARTYPE   char

Character type of error messages.

The default character type is char. On Windows, user can define this macro as TCHAR for supporting both unicode/non-unicode settings.

#define RAPIDJSON_ERROR_STRING

(

x

)

x

Macro for converting string literial to RAPIDJSON_ERROR_CHARTYPE[].

By default this conversion macro does nothing. On Windows, user can define this macro as _T(x) for supporting both unicode/non-unicode settings.

#define RAPIDJSON_PARSE_ERROR	(		parseErrorCode,
			offset
	)

(Internal) macro to indicate and handle a parse error.

Parameters

parseErrorCode	rapidjson::ParseErrorCode of the error
offset	position of the error in JSON input (size_t)

Invokes RAPIDJSON_PARSE_ERROR_NORETURN and stops the parsing.

See also

RAPIDJSON_PARSE_ERROR_NORETURN

#define RAPIDJSON_PARSE_ERROR_NORETURN	(		parseErrorCode,
			offset
	)

Value:

RAPIDJSON_MULTILINEMACRO_BEGIN \
    RAPIDJSON_ASSERT(!HasParseError()); /* Error can only be assigned once */ \
    SetParseError(parseErrorCode, offset); \
    RAPIDJSON_MULTILINEMACRO_END

Macro to indicate a parse error.

Parameters

parseErrorCode	rapidjson::ParseErrorCode of the error
offset	position of the error in JSON input (size_t)

This macros can be used as a customization point for the internal error handling mechanism of RapidJSON.

A common usage model is to throw an exception instead of requiring the caller to explicitly check the rapidjson::GenericReader::Parse's return value:

#define RAPIDJSON_PARSE_ERROR_NORETURN(parseErrorCode,offset) \
   throw ParseException(parseErrorCode, #parseErrorCode, offset)

#include <stdexcept>               // std::runtime_error
#include "rapidjson/error/error.h" // rapidjson::ParseResult

struct ParseException : std::runtime_error, rapidjson::ParseResult {
  ParseException(rapidjson::ParseErrorCode code, const char* msg, size_t offset)
    : std::runtime_error(msg), ParseResult(code, offset) {}
};

#include "rapidjson/reader.h"

See also

RAPIDJSON_PARSE_ERROR, rapidjson::GenericReader::Parse

Typedef Documentation

typedef const RAPIDJSON_ERROR_CHARTYPE*(* rapidjson::GetParseErrorFunc) (ParseErrorCode)

Function pointer type of GetParseError().

This is the prototype for GetParseError_X(), where X is a locale. User can dynamically change locale in runtime, e.g.:

GetParseErrorFunc GetParseError = GetParseError_En; // or whatever
const RAPIDJSON_ERROR_CHARTYPE* s = GetParseError(document.GetParseErrorCode());

Enumeration Type Documentation

enum rapidjson::ParseErrorCode

Error code of parsing.

See also

GenericReader::Parse, GenericReader::GetParseErrorCode

Enumerator
kParseErrorNone	No error.
kParseErrorDocumentEmpty	The document is empty.
kParseErrorDocumentRootNotSingular	The document root must not follow by other values.
kParseErrorValueInvalid	Invalid value.
kParseErrorObjectMissName	Missing a name for object member.
kParseErrorObjectMissColon	Missing a colon after a name of object member.
kParseErrorObjectMissCommaOrCurlyBracket	Missing a comma or '}' after an object member.
kParseErrorArrayMissCommaOrSquareBracket	Missing a comma or ']' after an array element.
kParseErrorStringUnicodeEscapeInvalidHex	Incorrect hex digit after \u escape in string.
kParseErrorStringUnicodeSurrogateInvalid	The surrogate pair in string is invalid.
kParseErrorStringEscapeInvalid	Invalid escape character in string.
kParseErrorStringMissQuotationMark	Missing a closing quotation mark in string.
kParseErrorStringInvalidEncoding	Invalid encoding in string.
kParseErrorNumberTooBig	Number too big to be stored in double.
kParseErrorNumberMissFraction	Miss fraction part in number.
kParseErrorNumberMissExponent	Miss exponent in number.
kParseErrorTermination	Parsing was terminated.
kParseErrorUnspecificSyntaxError	Unspecific syntax error.

Function Documentation

const RAPIDJSON_ERROR_CHARTYPE* rapidjson::GetParseError_En ( ParseErrorCode  parseErrorCode )

inline

Maps error code of parsing into error message.

Parameters

parseErrorCode

Error code obtained in parsing.

Returns

the error message.

Note

User can make a copy of this function for localization. Using switch-case is safer for future modification of error codes.