pythonnet/src/runtime/converter.cs at master · attackgithub/pythonnet · GitHub

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using System;

using System.Collections;

using System.Collections.Generic;

using System.Globalization;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Security;

using System.ComponentModel;

namespace Python.Runtime

{

/// <summary>

/// Performs data conversions between managed types and Python types.

/// </summary>

[SuppressUnmanagedCodeSecurity]

internal class Converter

{

private Converter()

{

}

private static NumberFormatInfo nfi;

private static Type objectType;

private static Type stringType;

private static Type singleType;

private static Type doubleType;

private static Type decimalType;

private static Type int16Type;

private static Type int32Type;

private static Type int64Type;

private static Type flagsType;

private static Type boolType;

private static Type typeType;

static Converter()

{

nfi = NumberFormatInfo.InvariantInfo;

objectType = typeof(Object);

stringType = typeof(String);

int16Type = typeof(Int16);

int32Type = typeof(Int32);

int64Type = typeof(Int64);

singleType = typeof(Single);

doubleType = typeof(Double);

decimalType = typeof(Decimal);

flagsType = typeof(FlagsAttribute);

boolType = typeof(Boolean);

typeType = typeof(Type);

}

/// <summary>

/// Given a builtin Python type, return the corresponding CLR type.

/// </summary>

internal static Type GetTypeByAlias(IntPtr op)

{

if (op == Runtime.PyStringType)

return stringType;

if (op == Runtime.PyUnicodeType)

return stringType;

if (op == Runtime.PyIntType)

return int32Type;

if (op == Runtime.PyLongType)

return int64Type;

if (op == Runtime.PyFloatType)

return doubleType;

if (op == Runtime.PyBoolType)

return boolType;

return null;

}

internal static IntPtr GetPythonTypeByAlias(Type op)

{

if (op == stringType)

return Runtime.PyUnicodeType;

if (op == int16Type)

return Runtime.PyIntType;

if (op == int32Type)

return Runtime.PyIntType;

if (op == int64Type && Runtime.IsPython2)

return Runtime.PyLongType;

if (op == int64Type)

return Runtime.PyIntType;

if (op == doubleType)

return Runtime.PyFloatType;

if (op == singleType)

return Runtime.PyFloatType;

if (op == boolType)

return Runtime.PyBoolType;

return IntPtr.Zero;

}

/// <summary>

/// Return a Python object for the given native object, converting

/// basic types (string, int, etc.) into equivalent Python objects.

/// This always returns a new reference. Note that the System.Decimal

/// type has no Python equivalent and converts to a managed instance.

/// </summary>

internal static IntPtr ToPython<T>(T value)

{

return ToPython(value, typeof(T));

}

internal static IntPtr ToPython(object value, Type type)

{

if (value is PyObject)

{

IntPtr handle = ((PyObject)value).Handle;

Runtime.XIncref(handle);

return handle;

}

IntPtr result = IntPtr.Zero;

// Null always converts to None in Python.

if (value == null)

{

result = Runtime.PyNone;

Runtime.XIncref(result);

return result;

}

if (value is IList && !(value is INotifyPropertyChanged) && value.GetType().IsGenericType)

{

using (var resultlist = new PyList())

{

foreach (object o in (IEnumerable)value)

{

using (var p = new PyObject(ToPython(o, o?.GetType())))

{

resultlist.Append(p);

}

Runtime.XIncref(resultlist.Handle);

return resultlist.Handle;

}

// it the type is a python subclass of a managed type then return the

// underlying python object rather than construct a new wrapper object.

var pyderived = value as IPythonDerivedType;

if (null != pyderived)

{

#if NETSTANDARD

return ClassDerivedObject.ToPython(pyderived);

#else

// if object is remote don't do this

if (!System.Runtime.Remoting.RemotingServices.IsTransparentProxy(pyderived))

{

return ClassDerivedObject.ToPython(pyderived);

}

#endif

}

// hmm - from Python, we almost never care what the declared

// type is. we'd rather have the object bound to the actual

// implementing class.

type = value.GetType();

TypeCode tc = Type.GetTypeCode(type);

switch (tc)

{

case TypeCode.Object:

return CLRObject.GetInstHandle(value, type);

case TypeCode.String:

return Runtime.PyUnicode_FromString((string)value);

case TypeCode.Int32:

return Runtime.PyInt_FromInt32((int)value);

case TypeCode.Boolean:

if ((bool)value)

{

Runtime.XIncref(Runtime.PyTrue);

return Runtime.PyTrue;

}

Runtime.XIncref(Runtime.PyFalse);

return Runtime.PyFalse;

case TypeCode.Byte:

return Runtime.PyInt_FromInt32((int)((byte)value));

case TypeCode.Char:

return Runtime.PyUnicode_FromOrdinal((int)((char)value));

case TypeCode.Int16:

return Runtime.PyInt_FromInt32((int)((short)value));

case TypeCode.Int64:

return Runtime.PyLong_FromLongLong((long)value);

case TypeCode.Single:

// return Runtime.PyFloat_FromDouble((double)((float)value));

string ss = ((float)value).ToString(nfi);

IntPtr ps = Runtime.PyString_FromString(ss);

IntPtr op = Runtime.PyFloat_FromString(ps, IntPtr.Zero);

Runtime.XDecref(ps);

return op;

case TypeCode.Double:

return Runtime.PyFloat_FromDouble((double)value);

case TypeCode.SByte:

return Runtime.PyInt_FromInt32((int)((sbyte)value));

case TypeCode.UInt16:

return Runtime.PyInt_FromInt32((int)((ushort)value));

case TypeCode.UInt32:

return Runtime.PyLong_FromUnsignedLong((uint)value);

case TypeCode.UInt64:

return Runtime.PyLong_FromUnsignedLongLong((ulong)value);

default:

if (value is IEnumerable)

{

using (var resultlist = new PyList())

{

foreach (object o in (IEnumerable)value)

{

using (var p = new PyObject(ToPython(o, o?.GetType())))

{

resultlist.Append(p);

}

Runtime.XIncref(resultlist.Handle);

return resultlist.Handle;

}

result = CLRObject.GetInstHandle(value, type);

return result;

}

/// <summary>

/// In a few situations, we don't have any advisory type information

/// when we want to convert an object to Python.

/// </summary>

internal static IntPtr ToPythonImplicit(object value)

{

if (value == null)

{

IntPtr result = Runtime.PyNone;

Runtime.XIncref(result);

return result;

}

return ToPython(value, objectType);

}

/// <summary>

/// Return a managed object for the given Python object, taking funny

/// byref types into account.

/// </summary>

internal static bool ToManaged(IntPtr value, Type type,

out object result, bool setError)

{

if (type.IsByRef)

{

type = type.GetElementType();

}

return Converter.ToManagedValue(value, type, out result, setError);

}

internal static bool ToManagedValue(IntPtr value, Type obType,

out object result, bool setError)

{

if (obType == typeof(PyObject))

{

Runtime.XIncref(value); // PyObject() assumes ownership

result = new PyObject(value);

return true;

}

// Common case: if the Python value is a wrapped managed object

// instance, just return the wrapped object.

ManagedType mt = ManagedType.GetManagedObject(value);

result = null;

if (mt != null)

{

if (mt is CLRObject)

{

object tmp = ((CLRObject)mt).inst;

if (obType.IsInstanceOfType(tmp))

{

result = tmp;

return true;

}

Exceptions.SetError(Exceptions.TypeError, $"value cannot be converted to {obType}");

return false;

}

if (mt is ClassBase)

{

result = ((ClassBase)mt).type;

return true;

}

// shouldn't happen

return false;

}

if (value == Runtime.PyNone && !obType.IsValueType)

{

result = null;

return true;

}

if (obType.IsGenericType && obType.GetGenericTypeDefinition() == typeof(Nullable<>))

{

if( value == Runtime.PyNone )

{

result = null;

return true;

}

// Set type to underlying type

obType = obType.GetGenericArguments()[0];

}

if (obType.IsArray)

{

return ToArray(value, obType, out result, setError);

}

if (obType.IsEnum)

{

return ToEnum(value, obType, out result, setError);

}

// Conversion to 'Object' is done based on some reasonable default

// conversions (Python string -> managed string, Python int -> Int32 etc.).

if (obType == objectType)

{

if (Runtime.IsStringType(value))

{

return ToPrimitive(value, stringType, out result, setError);

}

if (Runtime.PyBool_Check(value))

{

return ToPrimitive(value, boolType, out result, setError);

}

if (Runtime.PyInt_Check(value))

{

return ToPrimitive(value, int32Type, out result, setError);

}

if (Runtime.PyLong_Check(value))

{

return ToPrimitive(value, int64Type, out result, setError);

}

if (Runtime.PyFloat_Check(value))

{

return ToPrimitive(value, doubleType, out result, setError);

}

if (Runtime.PySequence_Check(value))

{

return ToArray(value, typeof(object[]), out result, setError);

}

if (setError)

{

Exceptions.SetError(Exceptions.TypeError, "value cannot be converted to Object");

}

return false;

}

// Conversion to 'Type' is done using the same mappings as above for objects.

if (obType == typeType)

{

if (value == Runtime.PyStringType)

{

result = stringType;

return true;

}

if (value == Runtime.PyBoolType)

{

result = boolType;

return true;

}

if (value == Runtime.PyIntType)

{

result = int32Type;

return true;

}

if (value == Runtime.PyLongType)

{

result = int64Type;

return true;

}

if (value == Runtime.PyFloatType)

{

result = doubleType;

return true;

}

if (value == Runtime.PyListType || value == Runtime.PyTupleType)

{

result = typeof(object[]);

return true;

}

if (setError)

{

Exceptions.SetError(Exceptions.TypeError, "value cannot be converted to Type");

}

return false;

}

return ToPrimitive(value, obType, out result, setError);

}

/// <summary>

/// Convert a Python value to an instance of a primitive managed type.

/// </summary>

private static bool ToPrimitive(IntPtr value, Type obType, out object result, bool setError)

{

IntPtr overflow = Exceptions.OverflowError;

TypeCode tc = Type.GetTypeCode(obType);

result = null;

IntPtr op;

int ival;

switch (tc)

{

case TypeCode.String:

string st = Runtime.GetManagedString(value);

if (st == null)

{

goto type_error;

}

result = st;

return true;

case TypeCode.Int32:

// Trickery to support 64-bit platforms.

if (Runtime.IsPython2 && Runtime.Is32Bit)

{

op = Runtime.PyNumber_Int(value);

// As of Python 2.3, large ints magically convert :(

if (Runtime.PyLong_Check(op))

{

Runtime.XDecref(op);

goto overflow;

}

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ival = (int)Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

result = ival;

return true;

}

else // Python3 always use PyLong API

{

op = Runtime.PyNumber_Long(value);

if (op == IntPtr.Zero)

{

Exceptions.Clear();

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

long ll = (long)Runtime.PyLong_AsLongLong(op);

Runtime.XDecref(op);

if (ll == -1 && Exceptions.ErrorOccurred())

{

goto overflow;

}

if (ll > Int32.MaxValue || ll < Int32.MinValue)

{

goto overflow;

}

result = (int)ll;

return true;

}

case TypeCode.Boolean:

result = Runtime.PyObject_IsTrue(value) != 0;

return true;

case TypeCode.Byte:

#if PYTHON3

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

op = Runtime.PyBytes_AS_STRING(value);

result = (byte)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#elif PYTHON2

if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType))

{

if (Runtime.PyString_Size(value) == 1)

{

op = Runtime.PyString_AsString(value);

result = (byte)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#endif

op = Runtime.PyNumber_Int(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ival = (int)Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

if (ival > Byte.MaxValue || ival < Byte.MinValue)

{

goto overflow;

}

byte b = (byte)ival;

result = b;

return true;

case TypeCode.SByte:

#if PYTHON3

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

op = Runtime.PyBytes_AS_STRING(value);

result = (byte)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#elif PYTHON2

if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType))

{

if (Runtime.PyString_Size(value) == 1)

{

op = Runtime.PyString_AsString(value);

result = (sbyte)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#endif

op = Runtime.PyNumber_Int(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ival = (int)Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

if (ival > SByte.MaxValue || ival < SByte.MinValue)

{

goto overflow;

}

sbyte sb = (sbyte)ival;

result = sb;

return true;

case TypeCode.Char:

#if PYTHON3

if (Runtime.PyObject_TypeCheck(value, Runtime.PyBytesType))

{

if (Runtime.PyBytes_Size(value) == 1)

{

op = Runtime.PyBytes_AS_STRING(value);

result = (byte)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#elif PYTHON2

if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType))

{

if (Runtime.PyString_Size(value) == 1)

{

op = Runtime.PyString_AsString(value);

result = (char)Marshal.ReadByte(op);

return true;

}

goto type_error;

}

#endif

else if (Runtime.PyObject_TypeCheck(value, Runtime.PyUnicodeType))

{

if (Runtime.PyUnicode_GetSize(value) == 1)

{

op = Runtime.PyUnicode_AsUnicode(value);

Char[] buff = new Char[1];

Marshal.Copy(op, buff, 0, 1);

result = buff[0];

return true;

}

goto type_error;

}

op = Runtime.PyNumber_Int(value);

if (op == IntPtr.Zero)

{

goto type_error;

}

ival = Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

if (ival > Char.MaxValue || ival < Char.MinValue)

{

goto overflow;

}

result = (char)ival;

return true;

case TypeCode.Int16:

op = Runtime.PyNumber_Int(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ival = (int)Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

if (ival > Int16.MaxValue || ival < Int16.MinValue)

{

goto overflow;

}

short s = (short)ival;

result = s;

return true;

case TypeCode.Int64:

op = Runtime.PyNumber_Long(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

long l = (long)Runtime.PyLong_AsLongLong(op);

Runtime.XDecref(op);

if ((l == -1) && Exceptions.ErrorOccurred())

{

goto overflow;

}

result = l;

return true;

case TypeCode.UInt16:

op = Runtime.PyNumber_Int(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ival = (int)Runtime.PyInt_AsLong(op);

Runtime.XDecref(op);

if (ival > UInt16.MaxValue || ival < UInt16.MinValue)

{

goto overflow;

}

ushort us = (ushort)ival;

result = us;

return true;

case TypeCode.UInt32:

op = Runtime.PyNumber_Long(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

uint ui = (uint)Runtime.PyLong_AsUnsignedLong(op);

if (Exceptions.ErrorOccurred())

{

Runtime.XDecref(op);

goto overflow;

}

IntPtr check = Runtime.PyLong_FromUnsignedLong(ui);

int err = Runtime.PyObject_Compare(check, op);

Runtime.XDecref(check);

Runtime.XDecref(op);

if (0 != err || Exceptions.ErrorOccurred())

{

goto overflow;

}

result = ui;

return true;

case TypeCode.UInt64:

op = Runtime.PyNumber_Long(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

ulong ul = (ulong)Runtime.PyLong_AsUnsignedLongLong(op);

Runtime.XDecref(op);

if (Exceptions.ErrorOccurred())

{

goto overflow;

}

result = ul;

return true;

case TypeCode.Single:

op = Runtime.PyNumber_Float(value);

if (op == IntPtr.Zero)

{

if (Exceptions.ExceptionMatches(overflow))

{

goto overflow;

}

goto type_error;

}

double dd = Runtime.PyFloat_AsDouble(op);

Runtime.CheckExceptionOccurred();

Runtime.XDecref(op);

if (dd > Single.MaxValue || dd < Single.MinValue)

{

if (!double.IsInfinity(dd))

{

goto overflow;

}

result = (float)dd;

return true;

case TypeCode.Double:

op = Runtime.PyNumber_Float(value);

if (op == IntPtr.Zero)

{

goto type_error;

}

double d = Runtime.PyFloat_AsDouble(op);

Runtime.CheckExceptionOccurred();

Runtime.XDecref(op);

result = d;

return true;

}

type_error:

if (setError)

{

string tpName = Runtime.PyObject_GetTypeName(value);

Exceptions.SetError(Exceptions.TypeError, $"'{tpName}' value cannot be converted to {obType}");

}

return false;

overflow:

if (setError)

{

Exceptions.SetError(Exceptions.OverflowError, "value too large to convert");

}

return false;

}

private static void SetConversionError(IntPtr value, Type target)

{

IntPtr ob = Runtime.PyObject_Repr(value);

string src = Runtime.GetManagedString(ob);

Runtime.XDecref(ob);

Exceptions.SetError(Exceptions.TypeError, $"Cannot convert {src} to {target}");

}

/// <summary>

/// Convert a Python value to a correctly typed managed array instance.

/// The Python value must support the Python sequence protocol and the

/// items in the sequence must be convertible to the target array type.

/// </summary>

private static bool ToArray(IntPtr value, Type obType, out object result, bool setError)

{

Type elementType = obType.GetElementType();

var size = Runtime.PySequence_Size(value);

result = null;

if (size < 0)

{

if (setError)

{

SetConversionError(value, obType);

}

return false;

}

Array items = Array.CreateInstance(elementType, size);

// XXX - is there a better way to unwrap this if it is a real array?

for (var i = 0; i < size; i++)

{

object obj = null;

IntPtr item = Runtime.PySequence_GetItem(value, i);

if (item == IntPtr.Zero)

{

if (setError)

{

SetConversionError(value, obType);

return false;

}

if (!Converter.ToManaged(item, elementType, out obj, true))

{

Runtime.XDecref(item);

return false;

}

items.SetValue(obj, i);

Runtime.XDecref(item);

}

result = items;

return true;

}

/// <summary>

/// Convert a Python value to a correctly typed managed enum instance.

/// </summary>

private static bool ToEnum(IntPtr value, Type obType, out object result, bool setError)

{

Type etype = Enum.GetUnderlyingType(obType);

result = null;

if (!ToPrimitive(value, etype, out result, setError))

{

return false;

}

if (Enum.IsDefined(obType, result))

{

result = Enum.ToObject(obType, result);

return true;

}

if (obType.GetCustomAttributes(flagsType, true).Length > 0)

{

result = Enum.ToObject(obType, result);

return true;

}

if (setError)

{

Exceptions.SetError(Exceptions.ValueError, "invalid enumeration value");

}

return false;

}

public static class ConverterExtension

{

public static PyObject ToPython(this object o)

{

return new PyObject(Converter.ToPython(o, o?.GetType()));

}

pythonnet/src/runtime/converter.cs at master · attackgithub/pythonnet · GitHub

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