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715 lines
25 KiB
C#
715 lines
25 KiB
C#
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// ==========================================================================
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// This software is subject to the provisions of the Zope Public License,
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// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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// FOR A PARTICULAR PURPOSE.
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// ==========================================================================
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using System;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Globalization;
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using System.Security;
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namespace Python.Runtime {
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//========================================================================
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// Performs data conversions between managed types and Python types.
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//========================================================================
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[SuppressUnmanagedCodeSecurityAttribute()]
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internal class Converter {
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private Converter() {}
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static NumberFormatInfo nfi;
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static Type objectType;
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static Type stringType;
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static Type doubleType;
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static Type int32Type;
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static Type int64Type;
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static Type flagsType;
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static Type boolType;
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//static Type typeType;
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static Converter () {
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nfi = NumberFormatInfo.InvariantInfo;
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objectType = typeof(Object);
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stringType = typeof(String);
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int32Type = typeof(Int32);
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int64Type = typeof(Int64);
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doubleType = typeof(Double);
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flagsType = typeof(FlagsAttribute);
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boolType = typeof(Boolean);
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//typeType = typeof(Type);
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}
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//====================================================================
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// Given a builtin Python type, return the corresponding CLR type.
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//====================================================================
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internal static Type GetTypeByAlias(IntPtr op) {
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if ((op == Runtime.PyStringType) ||
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(op == Runtime.PyUnicodeType)) {
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return stringType;
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}
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else if (op == Runtime.PyIntType) {
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return int32Type;
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}
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else if (op == Runtime.PyLongType) {
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return int64Type;
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}
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else if (op == Runtime.PyFloatType) {
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return doubleType;
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}
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else if (op == Runtime.PyBoolType) {
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return boolType;
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}
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return null;
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}
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//====================================================================
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// Return a Python object for the given native object, converting
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// basic types (string, int, etc.) into equivalent Python objects.
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// This always returns a new reference. Note that the System.Decimal
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// type has no Python equivalent and converts to a managed instance.
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//====================================================================
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internal static IntPtr ToPython(Object value, Type type) {
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IntPtr result = IntPtr.Zero;
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// Null always converts to None in Python.
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if (value == null) {
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result = Runtime.PyNone;
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Runtime.Incref(result);
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return result;
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}
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// hmm - from Python, we almost never care what the declared
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// type is. we'd rather have the object bound to the actual
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// implementing class.
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type = value.GetType();
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TypeCode tc = Type.GetTypeCode(type);
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switch(tc) {
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case TypeCode.Object:
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result = CLRObject.GetInstHandle(value, type);
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// XXX - hack to make sure we convert new-style class based
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// managed exception instances to wrappers ;(
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if (Runtime.wrap_exceptions) {
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Exception e = value as Exception;
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if (e != null) {
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return Exceptions.GetExceptionInstanceWrapper(result);
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}
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}
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return result;
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case TypeCode.String:
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return Runtime.PyUnicode_FromString((string)value);
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case TypeCode.Int32:
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return Runtime.PyInt_FromInt32((int)value);
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case TypeCode.Boolean:
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if ((bool)value) {
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Runtime.Incref(Runtime.PyTrue);
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return Runtime.PyTrue;
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}
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Runtime.Incref(Runtime.PyFalse);
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return Runtime.PyFalse;
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case TypeCode.Byte:
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return Runtime.PyInt_FromInt32((int)((byte)value));
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case TypeCode.Char:
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return Runtime.PyUnicode_FromOrdinal((int)((char)value));
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case TypeCode.Int16:
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return Runtime.PyInt_FromInt32((int)((short)value));
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case TypeCode.Int64:
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return Runtime.PyLong_FromLongLong((long)value);
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case TypeCode.Single:
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// return Runtime.PyFloat_FromDouble((double)((float)value));
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string ss = ((float)value).ToString(nfi);
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IntPtr ps = Runtime.PyString_FromString(ss);
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IntPtr op = Runtime.PyFloat_FromString(ps, IntPtr.Zero);
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Runtime.Decref(ps);
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return op;
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case TypeCode.Double:
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return Runtime.PyFloat_FromDouble((double)value);
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case TypeCode.SByte:
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return Runtime.PyInt_FromInt32((int)((sbyte)value));
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case TypeCode.UInt16:
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return Runtime.PyInt_FromInt32((int)((ushort)value));
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case TypeCode.UInt32:
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return Runtime.PyLong_FromUnsignedLong((uint)value);
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case TypeCode.UInt64:
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return Runtime.PyLong_FromUnsignedLongLong((ulong)value);
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default:
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result = CLRObject.GetInstHandle(value, type);
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return result;
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}
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}
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//====================================================================
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// In a few situations, we don't have any advisory type information
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// when we want to convert an object to Python.
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//====================================================================
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internal static IntPtr ToPythonImplicit(Object value) {
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if (value == null) {
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IntPtr result = Runtime.PyNone;
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Runtime.Incref(result);
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return result;
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}
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return ToPython(value, objectType);
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}
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//====================================================================
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// Return a managed object for the given Python object, taking funny
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// byref types into account.
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//====================================================================
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internal static bool ToManaged(IntPtr value, Type type,
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out object result, bool setError) {
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if (type.IsByRef) {
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type = type.GetElementType();
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}
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return Converter.ToManagedValue(value, type, out result, setError);
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}
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internal static bool ToManagedValue(IntPtr value, Type obType,
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out Object result, bool setError) {
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// Common case: if the Python value is a wrapped managed object
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// instance, just return the wrapped object.
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ManagedType mt = ManagedType.GetManagedObject(value);
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result = null;
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// XXX - hack to support objects wrapped in old-style classes
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// (such as exception objects).
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if (Runtime.wrap_exceptions) {
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if (mt == null) {
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if (Runtime.PyObject_IsInstance(
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value, Exceptions.Exception
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) > 0) {
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IntPtr p = Runtime.PyObject_GetAttrString(value, "_inner");
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if (p != IntPtr.Zero) {
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// This is safe because we know that the __dict__ of
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// value holds a reference to _inner.
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value = p;
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Runtime.Decref(p);
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mt = ManagedType.GetManagedObject(value);
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}
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}
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IntPtr c = Exceptions.UnwrapExceptionClass(value);
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if ((c != IntPtr.Zero) && (c != value)) {
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value = c;
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Runtime.Decref(c);
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mt = ManagedType.GetManagedObject(value);
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}
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}
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}
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if (mt != null) {
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if (mt is CLRObject) {
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object tmp = ((CLRObject)mt).inst;
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if (obType.IsInstanceOfType(tmp)) {
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result = tmp;
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return true;
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}
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string err = "value cannot be converted to {0}";
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err = String.Format(err, obType);
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Exceptions.SetError(Exceptions.TypeError, err);
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return false;
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}
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if (mt is ClassBase) {
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result = ((ClassBase)mt).type;
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return true;
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}
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// shouldnt happen
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return false;
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}
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if (value == Runtime.PyNone && !obType.IsValueType) {
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result = null;
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return true;
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}
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if (obType.IsArray) {
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return ToArray(value, obType, out result, setError);
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}
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if (obType.IsEnum) {
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return ToEnum(value, obType, out result, setError);
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}
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// Conversion to 'Object' is done based on some reasonable
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// default conversions (Python string -> managed string,
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// Python int -> Int32 etc.).
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if (obType == objectType) {
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if (Runtime.IsStringType(value)) {
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return ToPrimitive(value, stringType, out result,
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setError);
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}
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else if (Runtime.PyBool_Check(value)) {
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return ToPrimitive(value, boolType, out result, setError);
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}
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else if (Runtime.PyInt_Check(value)) {
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return ToPrimitive(value, int32Type, out result, setError);
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}
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else if (Runtime.PyLong_Check(value)) {
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return ToPrimitive(value, int64Type, out result, setError);
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}
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else if (Runtime.PyFloat_Check(value)) {
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return ToPrimitive(value, doubleType, out result, setError);
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}
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else if (Runtime.PySequence_Check(value)) {
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return ToArray(value, typeof(object[]), out result,
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setError);
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}
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if (setError) {
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Exceptions.SetError(Exceptions.TypeError,
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"value cannot be converted to Object"
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);
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}
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return false;
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}
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return ToPrimitive(value, obType, out result, setError);
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}
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//====================================================================
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// Convert a Python value to an instance of a primitive managed type.
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//====================================================================
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static bool ToPrimitive(IntPtr value, Type obType, out Object result,
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bool setError) {
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IntPtr overflow = Exceptions.OverflowError;
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TypeCode tc = Type.GetTypeCode(obType);
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result = null;
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IntPtr op;
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int ival;
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switch(tc) {
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case TypeCode.String:
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string st = Runtime.GetManagedString(value);
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if (st == null) {
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goto type_error;
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}
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result = st;
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return true;
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case TypeCode.Int32:
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// Trickery to support 64-bit platforms.
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if (IntPtr.Size == 4) {
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op = Runtime.PyNumber_Int(value);
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// As of Python 2.3, large ints magically convert :(
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if (Runtime.PyLong_Check(op) ) {
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Runtime.Decref(op);
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goto overflow;
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}
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if (op == IntPtr.Zero) {
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if (Exceptions.ExceptionMatches(overflow)) {
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goto overflow;
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}
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goto type_error;
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}
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ival = (int)Runtime.PyInt_AsLong(op);
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Runtime.Decref(op);
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result = ival;
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return true;
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}
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else {
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op = Runtime.PyNumber_Long(value);
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if (op == IntPtr.Zero) {
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if (Exceptions.ExceptionMatches(overflow)) {
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goto overflow;
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}
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goto type_error;
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}
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long ll = (long)Runtime.PyLong_AsLongLong(op);
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Runtime.Decref(op);
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if ((ll == -1) && Exceptions.ErrorOccurred()) {
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goto overflow;
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}
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if (ll > Int32.MaxValue || ll < Int32.MinValue) {
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goto overflow;
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}
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result = (int)ll;
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return true;
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}
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case TypeCode.Boolean:
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result = (Runtime.PyObject_IsTrue(value) != 0);
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return true;
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case TypeCode.Byte:
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if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType)) {
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if (Runtime.PyString_Size(value) == 1) {
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op = Runtime.PyString_AS_STRING(value);
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result = (byte)Marshal.ReadByte(op);
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return true;
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}
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goto type_error;
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}
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op = Runtime.PyNumber_Int(value);
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if (op == IntPtr.Zero) {
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if (Exceptions.ExceptionMatches(overflow)) {
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goto overflow;
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}
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goto type_error;
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}
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ival = (int) Runtime.PyInt_AsLong(op);
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Runtime.Decref(op);
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if (ival > Byte.MaxValue || ival < Byte.MinValue) {
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goto overflow;
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}
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byte b = (byte) ival;
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result = b;
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return true;
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|
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case TypeCode.SByte:
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|
if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType)) {
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|
if (Runtime.PyString_Size(value) == 1) {
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|
op = Runtime.PyString_AS_STRING(value);
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result = (sbyte)Marshal.ReadByte(op);
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return true;
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}
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goto type_error;
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}
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|
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op = Runtime.PyNumber_Int(value);
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|
if (op == IntPtr.Zero) {
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|
if (Exceptions.ExceptionMatches(overflow)) {
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|
goto overflow;
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|
}
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|
goto type_error;
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}
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ival = (int) Runtime.PyInt_AsLong(op);
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|
Runtime.Decref(op);
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|
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if (ival > SByte.MaxValue || ival < SByte.MinValue) {
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|
goto overflow;
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|
}
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|
sbyte sb = (sbyte) ival;
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|
result = sb;
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return true;
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|
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|
case TypeCode.Char:
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|
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|
if (Runtime.PyObject_TypeCheck(value, Runtime.PyStringType)) {
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|
if (Runtime.PyString_Size(value) == 1) {
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|
op = Runtime.PyString_AS_STRING(value);
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result = (char)Marshal.ReadByte(op);
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|
return true;
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}
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goto type_error;
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}
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else if (Runtime.PyObject_TypeCheck(value,
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Runtime.PyUnicodeType)) {
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if (Runtime.PyUnicode_GetSize(value) == 1) {
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op = Runtime.PyUnicode_AS_UNICODE(value);
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|
#if (!UCS4)
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|
// 2011-01-02: Marshal as character array because the cast
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|
// result = (char)Marshal.ReadInt16(op); throws an OverflowException
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|
// on negative numbers with Check Overflow option set on the project
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||
|
Char[] buff = new Char[1];
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|
Marshal.Copy(op, buff, 0, 1);
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|
result = buff[0];
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|
#else
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|
// XXX this is probably NOT correct?
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result = (char)Marshal.ReadInt32(op);
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|
#endif
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|
return true;
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|
}
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|
goto type_error;
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|
}
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|
|
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|
op = Runtime.PyNumber_Int(value);
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|
if (op == IntPtr.Zero) {
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|
goto type_error;
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||
|
}
|
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|
ival = Runtime.PyInt_AsLong(op);
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|
if (ival > Char.MaxValue || ival < Char.MinValue) {
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|
goto overflow;
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|
}
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|
Runtime.Decref(op);
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||
|
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.Decref(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.Decref(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.Decref(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);
|
||
|
Runtime.Decref(op);
|
||
|
if (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.Decref(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(value);
|
||
|
if (dd > Single.MaxValue || dd < Single.MinValue) {
|
||
|
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.Decref(op);
|
||
|
if (d > Double.MaxValue || d < Double.MinValue) {
|
||
|
goto overflow;
|
||
|
}
|
||
|
result = d;
|
||
|
return true;
|
||
|
|
||
|
}
|
||
|
|
||
|
|
||
|
type_error:
|
||
|
|
||
|
if (setError) {
|
||
|
string format = "'{0}' value cannot be converted to {1}";
|
||
|
string tpName = Runtime.PyObject_GetTypeName(value);
|
||
|
string error = String.Format(format, tpName, obType);
|
||
|
Exceptions.SetError(Exceptions.TypeError, error);
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
|
||
|
overflow:
|
||
|
|
||
|
if (setError) {
|
||
|
string error = "value too large to convert";
|
||
|
Exceptions.SetError(Exceptions.OverflowError, error);
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
|
||
|
}
|
||
|
|
||
|
|
||
|
static void SetConversionError(IntPtr value, Type target) {
|
||
|
IntPtr ob = Runtime.PyObject_Repr(value);
|
||
|
string src = Runtime.GetManagedString(ob);
|
||
|
Runtime.Decref(ob);
|
||
|
string error = String.Format(
|
||
|
"Cannot convert {0} to {1}", src, target
|
||
|
);
|
||
|
Exceptions.SetError(Exceptions.TypeError, error);
|
||
|
}
|
||
|
|
||
|
|
||
|
//====================================================================
|
||
|
// 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.
|
||
|
//====================================================================
|
||
|
|
||
|
static bool ToArray(IntPtr value, Type obType, out Object result,
|
||
|
bool setError) {
|
||
|
|
||
|
Type elementType = obType.GetElementType();
|
||
|
int 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 (int 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.Decref(item);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
items.SetValue(obj, i);
|
||
|
Runtime.Decref(item);
|
||
|
}
|
||
|
|
||
|
result = items;
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
|
||
|
//====================================================================
|
||
|
// Convert a Python value to a correctly typed managed enum instance.
|
||
|
//====================================================================
|
||
|
|
||
|
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) {
|
||
|
string error = "invalid enumeration value";
|
||
|
Exceptions.SetError(Exceptions.ValueError, error);
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
}
|
||
|
|
||
|
|
||
|
}
|