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/******************************************************************************
*
* Project: CPL - Common Portability Library
* Purpose: JSon streaming parser
* Author: Even Rouault, even.rouault at spatialys.com
*
******************************************************************************
* Copyright (c) 2017, Even Rouault <even.rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef CPL_JSON_STREAMIN_PARSER_H
#define CPL_JSON_STREAMIN_PARSER_H
/*! @cond Doxygen_Suppress */
#if defined(__cplusplus) && !defined(CPL_SUPRESS_CPLUSPLUS)
#include <vector>
#include <string>
#include "cpl_port.h"
class CPL_DLL CPLJSonStreamingParser
{
CPL_DISALLOW_COPY_ASSIGN(CPLJSonStreamingParser)
enum State
{
INIT,
OBJECT,
ARRAY,
STRING,
NUMBER,
STATE_TRUE,
STATE_FALSE,
STATE_NULL
};
bool m_bExceptionOccurred = false;
bool m_bElementFound = false;
int m_nLastChar = 0;
int m_nLineCounter = 1;
int m_nCharCounter = 1;
std::vector<State> m_aState{};
std::string m_osToken{};
enum class ArrayState
{
INIT,
AFTER_COMMA,
AFTER_VALUE
};
std::vector<ArrayState> m_abArrayState{};
bool m_bInStringEscape = false;
bool m_bInUnicode = false;
std::string m_osUnicodeHex{};
size_t m_nMaxDepth = 1024;
size_t m_nMaxStringSize = 10000000;
enum MemberState
{
WAITING_KEY,
IN_KEY,
KEY_FINISHED,
IN_VALUE
};
std::vector<MemberState> m_aeObjectState{};
enum State currentState()
{
return m_aState.back();
}
void SkipSpace(const char *&pStr, size_t &nLength);
void AdvanceChar(const char *&pStr, size_t &nLength);
bool EmitUnexpectedChar(char ch, const char *pszExpecting = nullptr);
bool StartNewToken(const char *&pStr, size_t &nLength);
bool CheckAndEmitTrueFalseOrNull(char ch);
bool CheckStackEmpty();
void DecodeUnicode();
protected:
bool EmitException(const char *pszMessage);
public:
CPLJSonStreamingParser();
virtual ~CPLJSonStreamingParser();
void SetMaxDepth(size_t nVal);
void SetMaxStringSize(size_t nVal);
bool ExceptionOccurred() const
{
return m_bExceptionOccurred;
}
static std::string GetSerializedString(const char *pszStr);
virtual void Reset();
virtual bool Parse(const char *pStr, size_t nLength, bool bFinished);
virtual void String(const char * /*pszValue*/, size_t /*nLength*/)
{
}
virtual void Number(const char * /*pszValue*/, size_t /*nLength*/)
{
}
virtual void Boolean(bool /*b*/)
{
}
virtual void Null()
{
}
virtual void StartObject()
{
}
virtual void EndObject()
{
}
virtual void StartObjectMember(const char * /*pszKey*/, size_t /*nLength*/)
{
}
virtual void StartArray()
{
}
virtual void EndArray()
{
}
virtual void StartArrayMember()
{
}
virtual void Exception(const char * /*pszMessage*/)
{
}
};
#endif // __cplusplus
/*! @endcond */
#endif // CPL_JSON_STREAMIN_PARSER_H
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