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#include "loads.h"
#include <Python.h>
#include <library/cpp/json/fast_sax/parser.h>
#include <util/generic/algorithm.h>
#include <util/generic/stack.h>
#include <util/generic/vector.h>
#include <util/generic/ylimits.h>
#include <util/string/ascii.h>
using namespace NJson;
namespace {
enum EKind {
Undefined,
Array,
Dict,
Value,
Key,
};
static inline TStringBuf ToStr(EKind kind) noexcept {
switch (kind) {
case Undefined:
return TStringBuf("Undefined");
case Array:
return TStringBuf("Array");
case Dict:
return TStringBuf("Dict");
case Value:
return TStringBuf("Value");
case Key:
return TStringBuf("Key");
}
Y_UNREACHABLE();
}
struct TUnref {
static inline void Destroy(PyObject* o) noexcept {
Py_XDECREF(o);
}
};
using TObjectPtr = TAutoPtr<PyObject, TUnref>;
static inline TObjectPtr BuildBool(bool val) noexcept {
if (val) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
// Translate python exceptions from object-creating functions into c++ exceptions
// Such errors are reported by returning nullptr
// When a python error is set and C++ exception is caught by Cython wrapper,
// Python exception is propagated, while C++ exception is discarded.
PyObject* CheckNewObject(PyObject* obj) {
Y_ENSURE(obj != nullptr, "got python exception");
return obj;
}
void CheckRetcode(int retcode) {
Y_ENSURE(retcode == 0, "got python exception");
}
static inline TObjectPtr BuildSmall(long val) {
#if PY_VERSION_HEX >= 0x03000000
return CheckNewObject(PyLong_FromLong(val));
#else
return CheckNewObject(PyInt_FromLong(val));
#endif
}
PyObject* CreatePyString(TStringBuf str, bool intern, bool mayUnicode) {
#if PY_VERSION_HEX >= 0x03000000
Y_UNUSED(mayUnicode);
PyObject* pyStr = PyUnicode_FromStringAndSize(str.data(), str.size());
if (intern) {
PyUnicode_InternInPlace(&pyStr);
}
#else
const bool needUnicode = mayUnicode && !AllOf(str, IsAscii);
PyObject* pyStr = needUnicode ? PyUnicode_FromStringAndSize(str.data(), str.size())
: PyString_FromStringAndSize(str.data(), str.size());
if (intern && !needUnicode) {
PyString_InternInPlace(&pyStr);
}
#endif
return pyStr;
}
struct TVal {
EKind Kind = Undefined;
TObjectPtr Val;
inline TVal() noexcept
: Kind(Undefined)
{
}
inline TVal(EKind kind, TObjectPtr val) noexcept
: Kind(kind)
, Val(val)
{
}
};
static inline TObjectPtr NoneRef() noexcept {
Py_RETURN_NONE;
}
struct TContext: public TJsonCallbacks {
const bool InternKeys;
const bool InternVals;
const bool MayUnicode;
TStack<TVal, TVector<TVal>> S;
inline TContext(bool internKeys, bool internVals, bool mayUnicode)
: TJsonCallbacks(true)
, InternKeys(internKeys)
, InternVals(internVals)
, MayUnicode(mayUnicode)
{
S.emplace();
}
inline bool Consume(TObjectPtr o) {
auto& t = S.top();
if (t.Kind == Array) {
CheckRetcode(PyList_Append(t.Val.Get(), o.Get()));
} else if (t.Kind == Key) {
auto key = S.top().Val;
S.pop();
CheckRetcode(PyDict_SetItem(S.top().Val.Get(), key.Get(), o.Get()));
} else {
t = TVal(Value, o);
}
return true;
}
inline TObjectPtr Pop(EKind expect) {
auto res = S.top();
S.pop();
if (res.Kind != expect) {
ythrow yexception() << "unexpected kind(expect " << ToStr(expect) << ", got " << ToStr(res.Kind) << ")";
}
return res.Val;
}
inline void Push(EKind kind, TObjectPtr object) {
S.push(TVal(kind, object));
}
virtual bool OnNull() {
return Consume(NoneRef());
}
virtual bool OnBoolean(bool v) {
return Consume(BuildBool(v));
}
virtual bool OnInteger(long long v) {
if (v >= (long long)Min<long>()) {
return Consume(BuildSmall((long)v));
}
return Consume(CheckNewObject(PyLong_FromLongLong(v)));
}
virtual bool OnUInteger(unsigned long long v) {
if (v <= (unsigned long long)Max<long>()) {
return Consume(BuildSmall((long)v));
}
return Consume(CheckNewObject(PyLong_FromUnsignedLongLong(v)));
}
virtual bool OnDouble(double v) {
return Consume(CheckNewObject(PyFloat_FromDouble(v)));
}
virtual bool OnString(const TStringBuf& v) {
return Consume(CheckNewObject(CreatePyString(v, InternVals, MayUnicode)));
}
virtual bool OnOpenMap() {
Push(Dict, CheckNewObject(PyDict_New()));
return true;
}
virtual bool OnCloseMap() {
return Consume(Pop(Dict));
}
virtual bool OnMapKey(const TStringBuf& k) {
Push(Key, CheckNewObject(CreatePyString(k, InternKeys, MayUnicode)));
return true;
}
virtual bool OnOpenArray() {
Push(Array, CheckNewObject(PyList_New(0)));
return true;
}
virtual bool OnCloseArray() {
return Consume(Pop(Array));
}
};
}
PyObject* LoadJsonFromString(const char* data, size_t len, bool internKeys, bool internVals, bool mayUnicode) {
TContext ctx(internKeys, internVals, mayUnicode);
if (!len) {
ythrow yexception() << "parse error: zero length input string";
}
if (!NJson::ReadJsonFast(TStringBuf(data, len), &ctx)) {
ythrow yexception() << "parse error";
}
auto& s = ctx.S;
if (!s || s.top().Kind != Value) {
ythrow yexception() << "shit happen";
}
return s.top().Val.Release();
}
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