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#pragma once
#include "detail.h"
namespace NYson {
namespace NDetail {
////////////////////////////////////////////////////////////////////////////////
template <class TConsumer, class TBlockStream, bool EnableLinePositionInfo>
class TParser
: public TLexerBase<TBlockStream, EnableLinePositionInfo> {
private:
using TBase = TLexerBase<TBlockStream, EnableLinePositionInfo>;
TConsumer* Consumer;
public:
TParser(const TBlockStream& blockStream, TConsumer* consumer, TMaybe<ui64> memoryLimit)
: TBase(blockStream, memoryLimit)
, Consumer(consumer)
{
}
void DoParse(EYsonType ysonType) {
switch (ysonType) {
case ::NYson::EYsonType::Node:
ParseNode<true>();
break;
case ::NYson::EYsonType::ListFragment:
ParseListFragment<true>(EndSymbol);
break;
case ::NYson::EYsonType::MapFragment:
ParseMapFragment<true>(EndSymbol);
break;
default:
Y_FAIL("unreachable");
}
while (!(TBase::IsFinished() && TBase::IsEmpty())) {
if (TBase::template SkipSpaceAndGetChar<true>() != EndSymbol) {
ythrow TYsonException() << "Stray '" << (*TBase::Begin()) << "' found";
} else if (!TBase::IsEmpty()) {
TBase::Advance(1);
}
}
}
bool DoParseListFragment(bool first) {
bool ret = first ? first : ParseListSeparator<true>(EndSymbol);
return ret && ParseListItem<true>(EndSymbol);
}
void ParseAttributes() {
Consumer->OnBeginAttributes();
ParseMapFragment(EndAttributesSymbol);
TBase::SkipCharToken(EndAttributesSymbol);
Consumer->OnEndAttributes();
}
void ParseMap() {
Consumer->OnBeginMap();
ParseMapFragment(EndMapSymbol);
TBase::SkipCharToken(EndMapSymbol);
Consumer->OnEndMap();
}
void ParseList() {
Consumer->OnBeginList();
ParseListFragment(EndListSymbol);
TBase::SkipCharToken(EndListSymbol);
Consumer->OnEndList();
}
template <bool AllowFinish>
void ParseNode() {
return ParseNode<AllowFinish>(TBase::SkipSpaceAndGetChar());
}
template <bool AllowFinish>
void ParseNode(char ch) {
if (ch == BeginAttributesSymbol) {
TBase::Advance(1);
ParseAttributes();
ch = TBase::SkipSpaceAndGetChar();
}
switch (ch) {
case BeginMapSymbol:
TBase::Advance(1);
ParseMap();
break;
case BeginListSymbol:
TBase::Advance(1);
ParseList();
break;
case '"': {
TBase::Advance(1);
TStringBuf value;
TBase::ReadQuotedString(&value);
Consumer->OnStringScalar(value);
break;
}
case StringMarker: {
TBase::Advance(1);
TStringBuf value;
TBase::ReadBinaryString(&value);
Consumer->OnStringScalar(value);
break;
}
case Int64Marker: {
TBase::Advance(1);
i64 value;
TBase::ReadBinaryInt64(&value);
Consumer->OnInt64Scalar(value);
break;
}
case Uint64Marker: {
TBase::Advance(1);
ui64 value;
TBase::ReadBinaryUint64(&value);
Consumer->OnUint64Scalar(value);
break;
}
case DoubleMarker: {
TBase::Advance(1);
double value;
TBase::ReadBinaryDouble(&value);
Consumer->OnDoubleScalar(value);
break;
}
case FalseMarker: {
TBase::Advance(1);
Consumer->OnBooleanScalar(false);
break;
}
case TrueMarker: {
TBase::Advance(1);
Consumer->OnBooleanScalar(true);
break;
}
case EntitySymbol:
TBase::Advance(1);
Consumer->OnEntity();
break;
default: {
if (isdigit((unsigned char)ch) || ch == '-' || ch == '+') { // case of '+' is handled in AfterPlus state
ReadNumeric<AllowFinish>();
} else if (isalpha((unsigned char)ch) || ch == '_') {
TStringBuf value;
TBase::template ReadUnquotedString<AllowFinish>(&value);
Consumer->OnStringScalar(value);
} else if (ch == '%') {
TBase::Advance(1);
ch = TBase::template GetChar<AllowFinish>();
if (ch == 't' || ch == 'f') {
Consumer->OnBooleanScalar(TBase::template ReadBoolean<AllowFinish>());
} else {
Consumer->OnDoubleScalar(TBase::template ReadNanOrInf<AllowFinish>());
}
} else {
ythrow TYsonException() << "Unexpected '" << ch << "' while parsing node";
}
}
}
}
void ParseKey() {
return ParseKey(TBase::SkipSpaceAndGetChar());
}
void ParseKey(char ch) {
switch (ch) {
case '"': {
TBase::Advance(1);
TStringBuf value;
TBase::ReadQuotedString(&value);
Consumer->OnKeyedItem(value);
break;
}
case StringMarker: {
TBase::Advance(1);
TStringBuf value;
TBase::ReadBinaryString(&value);
Consumer->OnKeyedItem(value);
break;
}
default: {
if (isalpha(ch) || ch == '_') {
TStringBuf value;
TBase::ReadUnquotedString(&value);
Consumer->OnKeyedItem(value);
} else {
ythrow TYsonException() << "Unexpected '" << ch << "' while parsing key";
}
}
}
}
template <bool AllowFinish>
void ParseMapFragment(char endSymbol) {
char ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
while (ch != endSymbol) {
ParseKey(ch);
ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
if (ch == KeyValueSeparatorSymbol) {
TBase::Advance(1);
} else {
ythrow TYsonException() << "Expected '" << KeyValueSeparatorSymbol << "' but '" << ch << "' found";
}
ParseNode<AllowFinish>();
ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
if (ch == KeyedItemSeparatorSymbol) {
TBase::Advance(1);
ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
} else if (ch != endSymbol) {
ythrow TYsonException() << "Expected '" << KeyedItemSeparatorSymbol
<< "' or '" << endSymbol << "' but '" << ch << "' found";
}
}
}
void ParseMapFragment(char endSymbol) {
ParseMapFragment<false>(endSymbol);
}
template <bool AllowFinish>
bool ParseListItem(char endSymbol) {
char ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
if (ch != endSymbol) {
Consumer->OnListItem();
ParseNode<AllowFinish>(ch);
return true;
}
return false;
}
template <bool AllowFinish>
bool ParseListSeparator(char endSymbol) {
char ch = TBase::template SkipSpaceAndGetChar<AllowFinish>();
if (ch == ListItemSeparatorSymbol) {
TBase::Advance(1);
return true;
} else if (ch != endSymbol) {
ythrow TYsonException() << "Expected '" << ListItemSeparatorSymbol
<< "' or '" << endSymbol << "' but '" << ch << "' found";
}
return false;
}
template <bool AllowFinish>
void ParseListFragment(char endSymbol) {
while (ParseListItem<AllowFinish>(endSymbol) && ParseListSeparator<AllowFinish>(endSymbol)) {
}
}
void ParseListFragment(char endSymbol) {
ParseListFragment<false>(endSymbol);
}
template <bool AllowFinish>
void ReadNumeric() {
TStringBuf valueBuffer;
ENumericResult numericResult = TBase::template ReadNumeric<AllowFinish>(&valueBuffer);
if (numericResult == ENumericResult::Double) {
double value;
try {
value = FromString<double>(valueBuffer);
} catch (yexception& e) {
// This exception is wrapped in parser.
ythrow TYsonException() << "Failed to parse double literal '" << valueBuffer << "'" << e;
}
Consumer->OnDoubleScalar(value);
} else if (numericResult == ENumericResult::Int64) {
i64 value;
try {
value = FromString<i64>(valueBuffer);
} catch (yexception& e) {
// This exception is wrapped in parser.
ythrow TYsonException() << "Failed to parse int64 literal '" << valueBuffer << "'" << e;
}
Consumer->OnInt64Scalar(value);
} else if (numericResult == ENumericResult::Uint64) {
ui64 value;
try {
value = FromString<ui64>(valueBuffer.SubStr(0, valueBuffer.size() - 1));
} catch (yexception& e) {
// This exception is wrapped in parser.
ythrow TYsonException() << "Failed to parse uint64 literal '" << valueBuffer << "'" << e;
}
Consumer->OnUint64Scalar(value);
}
}
};
////////////////////////////////////////////////////////////////////////////////
}
template <class TConsumer, class TBlockStream>
void ParseYsonStreamImpl(
const TBlockStream& blockStream,
NYT::NYson::IYsonConsumer* consumer,
EYsonType parsingMode,
bool enableLinePositionInfo,
TMaybe<ui64> memoryLimit) {
if (enableLinePositionInfo) {
using TImpl = NDetail::TParser<TConsumer, TBlockStream, true>;
TImpl impl(blockStream, consumer, memoryLimit);
impl.DoParse(parsingMode);
} else {
using TImpl = NDetail::TParser<TConsumer, TBlockStream, false>;
TImpl impl(blockStream, consumer, memoryLimit);
impl.DoParse(parsingMode);
}
}
class TStatelessYsonParserImplBase {
public:
virtual void Parse(const TStringBuf& data, EYsonType type = ::NYson::EYsonType::Node) = 0;
virtual ~TStatelessYsonParserImplBase() {
}
};
template <class TConsumer, bool EnableLinePositionInfo>
class TStatelessYsonParserImpl
: public TStatelessYsonParserImplBase {
private:
using TParser = NDetail::TParser<TConsumer, TStringReader, EnableLinePositionInfo>;
TParser Parser;
public:
TStatelessYsonParserImpl(TConsumer* consumer, TMaybe<ui64> memoryLimit)
: Parser(TStringReader(), consumer, memoryLimit)
{
}
void Parse(const TStringBuf& data, EYsonType type = ::NYson::EYsonType::Node) override {
Parser.SetBuffer(data.begin(), data.end());
Parser.DoParse(type);
}
};
class TYsonListParserImplBase {
public:
virtual bool Parse() = 0;
virtual ~TYsonListParserImplBase() {
}
};
template <class TConsumer, class TBlockStream, bool EnableLinePositionInfo>
class TYsonListParserImpl
: public TYsonListParserImplBase {
private:
using TParser = NDetail::TParser<TConsumer, TBlockStream, EnableLinePositionInfo>;
TParser Parser;
bool First = true;
public:
TYsonListParserImpl(const TBlockStream& blockStream, TConsumer* consumer, TMaybe<ui64> memoryLimit)
: Parser(blockStream, consumer, memoryLimit)
{
}
bool Parse() override {
bool ret = Parser.DoParseListFragment(First);
First = false;
return ret;
}
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYson
|
