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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "JSONVariantParser.h"
#include <rapidjson/reader.h>
class CJSONVariantParserHandler
{
public:
explicit CJSONVariantParserHandler(CVariant& parsedObject);
bool Null();
bool Bool(bool b);
bool Int(int i);
bool Uint(unsigned u);
bool Int64(int64_t i);
bool Uint64(uint64_t u);
bool Double(double d);
bool RawNumber(const char* str, rapidjson::SizeType length, bool copy);
bool String(const char* str, rapidjson::SizeType length, bool copy);
bool StartObject();
bool Key(const char* str, rapidjson::SizeType length, bool copy);
bool EndObject(rapidjson::SizeType memberCount);
bool StartArray();
bool EndArray(rapidjson::SizeType elementCount);
private:
template <typename... TArgs>
bool Primitive(TArgs... args)
{
PushObject(CVariant(std::forward<TArgs>(args)...));
PopObject();
return true;
}
void PushObject(CVariant variant);
void PopObject();
CVariant& m_parsedObject;
std::vector<CVariant *> m_parse;
std::string m_key;
CVariant m_root;
enum class PARSE_STATUS
{
Variable,
Array,
Object
};
PARSE_STATUS m_status = PARSE_STATUS::Variable;
};
CJSONVariantParserHandler::CJSONVariantParserHandler(CVariant& parsedObject)
: m_parsedObject(parsedObject), m_parse(), m_key()
{ }
bool CJSONVariantParserHandler::Null()
{
PushObject(CVariant::ConstNullVariant);
PopObject();
return true;
}
bool CJSONVariantParserHandler::Bool(bool b)
{
return Primitive(b);
}
bool CJSONVariantParserHandler::Int(int i)
{
return Primitive(i);
}
bool CJSONVariantParserHandler::Uint(unsigned u)
{
return Primitive(u);
}
bool CJSONVariantParserHandler::Int64(int64_t i)
{
return Primitive(i);
}
bool CJSONVariantParserHandler::Uint64(uint64_t u)
{
return Primitive(u);
}
bool CJSONVariantParserHandler::Double(double d)
{
return Primitive(d);
}
bool CJSONVariantParserHandler::RawNumber(const char* str, rapidjson::SizeType length, bool copy)
{
return Primitive(str, length);
}
bool CJSONVariantParserHandler::String(const char* str, rapidjson::SizeType length, bool copy)
{
return Primitive(str, length);
}
bool CJSONVariantParserHandler::StartObject()
{
PushObject(CVariant::VariantTypeObject);
return true;
}
bool CJSONVariantParserHandler::Key(const char* str, rapidjson::SizeType length, bool copy)
{
m_key = std::string(str, 0, length);
return true;
}
bool CJSONVariantParserHandler::EndObject(rapidjson::SizeType memberCount)
{
PopObject();
return true;
}
bool CJSONVariantParserHandler::StartArray()
{
PushObject(CVariant::VariantTypeArray);
return true;
}
bool CJSONVariantParserHandler::EndArray(rapidjson::SizeType elementCount)
{
PopObject();
return true;
}
void CJSONVariantParserHandler::PushObject(CVariant variant)
{
const auto variant_type = variant.type();
if (m_status == PARSE_STATUS::Object)
{
(*m_parse.back())[m_key] = std::move(variant);
m_parse.push_back(&((*m_parse.back())[m_key]));
}
else if (m_status == PARSE_STATUS::Array)
{
CVariant *temp = m_parse[m_parse.size() - 1];
temp->push_back(std::move(variant));
m_parse.push_back(&(*temp)[temp->size() - 1]);
}
else if (m_parse.empty())
{
m_root = std::move(variant);
m_parse.push_back(&m_root);
}
if (variant_type == CVariant::VariantTypeObject)
m_status = PARSE_STATUS::Object;
else if (variant_type == CVariant::VariantTypeArray)
m_status = PARSE_STATUS::Array;
else
m_status = PARSE_STATUS::Variable;
}
void CJSONVariantParserHandler::PopObject()
{
assert(!m_parse.empty());
CVariant* variant = m_parse.back();
m_parse.pop_back();
if (!m_parse.empty())
{
variant = m_parse[m_parse.size() - 1];
if (variant->isObject())
m_status = PARSE_STATUS::Object;
else if (variant->isArray())
m_status = PARSE_STATUS::Array;
else
m_status = PARSE_STATUS::Variable;
}
else
{
m_parsedObject = *variant;
m_status = PARSE_STATUS::Variable;
}
}
bool CJSONVariantParser::Parse(const char* json, CVariant& data)
{
if (json == nullptr)
return false;
rapidjson::Reader reader;
rapidjson::StringStream stringStream(json);
CJSONVariantParserHandler handler(data);
// use kParseIterativeFlag to eliminate possible stack overflow
// from json parsing via reentrant calls
if (reader.Parse<rapidjson::kParseIterativeFlag>(stringStream, handler))
return true;
return false;
}
bool CJSONVariantParser::Parse(const std::string& json, CVariant& data)
{
return Parse(json.c_str(), data);
}
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