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241 lines (210 loc) · 4.78 KB
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//
// Parser.cpp
//
// Library: JSON
// Package: JSON
// Module: Parser
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/JSON/Parser.h"
#include "Poco/JSON/JSONException.h"
#include "Poco/Ascii.h"
#include "Poco/Token.h"
#include "Poco/UTF8Encoding.h"
#include "Poco/String.h"
#include "Poco/StreamCopier.h"
#undef min
#undef max
#include <limits>
#include <clocale>
#include <istream>
extern "C" {
#include "pd_json.h"
}
namespace Poco {
namespace JSON {
ParserImpl::ParserImpl(const Handler::Ptr& pHandler, std::size_t bufSize):
_pJSON(new json_stream),
_pHandler(pHandler),
_depth(JSON_UNLIMITED_DEPTH),
_decimalPoint('.'),
_allowNullByte(true),
_allowComments(false)
{
}
ParserImpl::~ParserImpl()
{
delete _pJSON;
}
void ParserImpl::handle(const std::string& json)
{
if (!_allowNullByte && json.find("\\u0000") != json.npos)
throw JSONException("Null bytes in strings not allowed.");
try
{
json_open_buffer(_pJSON, json.data(), json.size());
checkError();
//////////////////////////////////
// Underlying parser is capable of parsing multiple consecutive JSONs;
// we do not currently support this feature; to force error on
// excessive characters past valid JSON end, this MUST be called
// AFTER opening the buffer - otherwise it is overwritten by
// json_open*() call, which calls internal init()
json_set_streaming(_pJSON, false);
/////////////////////////////////
handle(); checkError();
if (JSON_DONE != json_next(_pJSON))
throw JSONException("Excess characters found after JSON end.");
json_close(_pJSON);
}
catch (std::exception&)
{
json_close(_pJSON);
throw;
}
}
Dynamic::Var ParserImpl::parseImpl(const std::string& json)
{
if (_allowComments)
{
std::string str = json;
stripComments(str);
handle(str);
}
else handle(json);
return asVarImpl();
}
Dynamic::Var ParserImpl::parseImpl(std::istream& in)
{
std::ostringstream os;
StreamCopier::copyStream(in, os);
return parseImpl(os.str());
}
void ParserImpl::stripComments(std::string& json)
{
if (_allowComments)
{
bool inString = false;
bool inComment = false;
char prevChar = 0;
std::string::iterator it = json.begin();
for (; it != json.end();)
{
if (*it == '"' && !inString) inString = true;
else inString = false;
if (!inString)
{
if (*it == '/' && it + 1 != json.end() && *(it + 1) == '*')
inComment = true;
}
if (inComment)
{
char c = *it;
it = json.erase(it);
if (prevChar == '*' && c == '/')
{
inComment = false;
prevChar = 0;
}
else prevChar = c;
}
else ++it;
}
}
}
void ParserImpl::handleArray()
{
json_type tok = json_peek(_pJSON);
while (tok != JSON_ARRAY_END && checkError())
{
handle();
tok = json_peek(_pJSON);
}
if (tok == JSON_ARRAY_END) handle();
else throw JSONException("JSON array end not found");
}
void ParserImpl::handleObject()
{
json_type tok = json_peek(_pJSON);
while (tok != JSON_OBJECT_END && checkError())
{
json_next(_pJSON);
if (_pHandler) _pHandler->key(std::string(json_get_string(_pJSON, NULL)));
handle();
tok = json_peek(_pJSON);
}
if (tok == JSON_OBJECT_END) handle();
else throw JSONException("JSON object end not found");
}
void ParserImpl::handle()
{
enum json_type type = json_next(_pJSON);
switch (type)
{
case JSON_DONE:
return;
case JSON_NULL:
_pHandler->null();
break;
case JSON_TRUE:
if (_pHandler) _pHandler->value(true);
break;
case JSON_FALSE:
if (_pHandler) _pHandler->value(false);
break;
case JSON_NUMBER:
{
if (_pHandler)
{
std::string str(json_get_string(_pJSON, NULL));
if (str.find(_decimalPoint) != str.npos || str.find('e') != str.npos || str.find('E') != str.npos)
{
_pHandler->value(NumberParser::parseFloat(str));
}
else
{
Poco::Int64 val;
if (NumberParser::tryParse64(str, val))
_pHandler->value(val);
else
_pHandler->value(NumberParser::parseUnsigned64(str));
}
}
break;
}
case JSON_STRING:
if (_pHandler) _pHandler->value(std::string(json_get_string(_pJSON, NULL)));
break;
case JSON_OBJECT:
if (_pHandler) _pHandler->startObject();
handleObject();
break;
case JSON_OBJECT_END:
if (_pHandler) _pHandler->endObject();
return;
case JSON_ARRAY:
if (_pHandler) _pHandler->startArray();
handleArray();
break;
case JSON_ARRAY_END:
if (_pHandler) _pHandler->endArray();
return;
case JSON_ERROR:
{
const char* pErr = json_get_error(_pJSON);
std::string err(pErr ? pErr : "JSON parser error.");
throw JSONException(err);
}
}
}
bool ParserImpl::checkError()
{
const char* err = json_get_error(_pJSON);
if (err) throw Poco::JSON::JSONException(err);
return true;
}
} } // namespace Poco::JSON