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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 PYTHON2
if (op == int64Type)
return Runtime.PyLongType;
#endif
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)
{
return ClassDerivedObject.ToPython(pyderived);
}
// 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:
#if PYTHON2
// Trickery to support 64-bit platforms.
if (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;
}
#endif
case TypeCode.Boolean:
result = Runtime.PyObject_IsTrue(value) != 0;
return true;
case TypeCode.Byte:
#if !PYTHON2
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;
}
#else
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 !PYTHON2
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;
}
#else
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 !PYTHON2
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;
}
#else
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;
try
{
ui = Convert.ToUInt32(Runtime.PyLong_AsUnsignedLong(op));
} catch (OverflowException)
{
// Probably wasn't an overflow in python but was in C# (e.g. if cpython
// longs are 64 bit then 0xFFFFFFFF + 1 will not overflow in
// PyLong_AsUnsignedLong)
Runtime.XDecref(op);
goto overflow;
}
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 iterator protocol or 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();
result = null;
bool IsSeqObj = Runtime.PySequence_Check(value);
var len = IsSeqObj ? Runtime.PySequence_Size(value) : -1;
IntPtr IterObject = Runtime.PyObject_GetIter(value);
if(IterObject==IntPtr.Zero) {
if (setError)
{
SetConversionError(value, obType);
}
return false;
}
Array items;
var listType = typeof(List<>);
var constructedListType = listType.MakeGenericType(elementType);
IList list = IsSeqObj ? (IList) Activator.CreateInstance(constructedListType, new Object[] {(int) len}) :
(IList) Activator.CreateInstance(constructedListType);
IntPtr item;
while ((item = Runtime.PyIter_Next(IterObject)) != IntPtr.Zero)
{
object obj = null;
if (!Converter.ToManaged(item, elementType, out obj, true))
{
Runtime.XDecref(item);
return false;
}
list.Add(obj);
Runtime.XDecref(item);
}
Runtime.XDecref(IterObject);
items = Array.CreateInstance(elementType, list.Count);
list.CopyTo(items, 0);
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()));
}
}
}