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228 lines (195 loc) · 10.7 KB
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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* [email protected]. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
using System.Numerics;
using System.Runtime.CompilerServices;
using Microsoft.Scripting.Runtime;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
[assembly: PythonModule("copyreg", typeof(IronPython.Modules.PythonCopyReg))]
namespace IronPython.Modules {
[Documentation("Provides global reduction-function registration for pickling and copying objects.")]
public static class PythonCopyReg {
private static readonly object _dispatchTableKey = new object();
private static readonly object _extensionRegistryKey = new object();
private static readonly object _invertedRegistryKey = new object();
private static readonly object _extensionCacheKey = new object();
internal static PythonDictionary GetDispatchTable(CodeContext/*!*/ context) {
EnsureModuleInitialized(context);
return (PythonDictionary)context.LanguageContext.GetModuleState(_dispatchTableKey);
}
internal static PythonDictionary GetExtensionRegistry(CodeContext/*!*/ context) {
EnsureModuleInitialized(context);
return (PythonDictionary)context.LanguageContext.GetModuleState(_extensionRegistryKey);
}
internal static PythonDictionary GetInvertedRegistry(CodeContext/*!*/ context) {
EnsureModuleInitialized(context);
return (PythonDictionary)context.LanguageContext.GetModuleState(_invertedRegistryKey);
}
internal static PythonDictionary GetExtensionCache(CodeContext/*!*/ context) {
EnsureModuleInitialized(context);
return (PythonDictionary)context.LanguageContext.GetModuleState(_extensionCacheKey);
}
#region Public API
[Documentation("pickle(type, function[, constructor]) -> None\n\n"
+ "Associate function with type, indicating that function should be used to\n"
+ "\"reduce\" objects of the given type when pickling. function should behave as\n"
+ "specified by the \"Extended __reduce__ API\" section of PEP 307.\n"
+ "\n"
+ "Reduction functions registered by calling pickle() can be retrieved later\n"
+ "through copyreg.dispatch_table[type].\n"
+ "\n"
+ "Note that calling pickle() will overwrite any previous association for the\n"
+ "given type.\n"
+ "\n"
+ "The constructor argument is ignored, and exists only for backwards\n"
+ "compatibility."
)]
public static void pickle(CodeContext/*!*/ context, object type, object function, object ctor=null) {
EnsureCallable(context, function, "reduction functions must be callable");
if (ctor != null) constructor(context, ctor);
GetDispatchTable(context)[type] = function;
}
[Documentation("constructor(object) -> None\n\n"
+ "Raise TypeError if object isn't callable. This function exists only for\n"
+ "backwards compatibility; for details, see\n"
+ "http://mail.python.org/pipermail/python-dev/2006-June/066831.html."
)]
public static void constructor(CodeContext/*!*/ context, object callable) {
EnsureCallable(context, callable, "constructors must be callable");
}
/// <summary>
/// Throw TypeError with a specified message if object isn't callable.
/// </summary>
private static void EnsureCallable(CodeContext/*!*/ context, object @object, string message) {
if (!PythonOps.IsCallable(context, @object)) {
throw PythonOps.TypeError(message);
}
}
[Documentation("pickle_complex(complex_number) -> (<type 'complex'>, (real, imag))\n\n"
+ "Reduction function for pickling complex numbers.")]
public static PythonTuple pickle_complex(CodeContext context, object complex) {
return PythonTuple.MakeTuple(
DynamicHelpers.GetPythonTypeFromType(typeof(Complex)),
PythonTuple.MakeTuple(
PythonOps.GetBoundAttr(context, complex, "real"),
PythonOps.GetBoundAttr(context, complex, "imag")
)
);
}
public static void clear_extension_cache(CodeContext/*!*/ context) {
GetExtensionCache(context).clear();
}
[Documentation("Register an extension code.")]
public static void add_extension(CodeContext/*!*/ context, object moduleName, object objectName, object value) {
PythonTuple key = PythonTuple.MakeTuple(moduleName, objectName);
int code = GetCode(context, value);
bool keyExists = GetExtensionRegistry(context).__contains__(key);
bool codeExists = GetInvertedRegistry(context).__contains__(code);
if (!keyExists && !codeExists) {
GetExtensionRegistry(context)[key] = code;
GetInvertedRegistry(context)[code] = key;
} else if (keyExists && codeExists &&
PythonOps.EqualRetBool(context, GetExtensionRegistry(context)[key], code) &&
PythonOps.EqualRetBool(context, GetInvertedRegistry(context)[code], key)
) {
// nop
} else {
if (keyExists) {
throw PythonOps.ValueError("key {0} is already registered with code {1}", PythonOps.Repr(context, key), PythonOps.Repr(context, GetExtensionRegistry(context)[key]));
} else { // codeExists
throw PythonOps.ValueError("code {0} is already in use for key {1}", PythonOps.Repr(context, code), PythonOps.Repr(context, GetInvertedRegistry(context)[code]));
}
}
}
[Documentation("Unregister an extension code. (only for testing)")]
public static void remove_extension(CodeContext/*!*/ context, object moduleName, object objectName, object value) {
PythonTuple key = PythonTuple.MakeTuple(moduleName, objectName);
int code = GetCode(context, value);
object existingKey;
object existingCode;
if (((IDictionary<object, object>)GetExtensionRegistry(context)).TryGetValue(key, out existingCode) &&
((IDictionary<object, object>)GetInvertedRegistry(context)).TryGetValue(code, out existingKey) &&
PythonOps.EqualRetBool(context, existingCode, code) &&
PythonOps.EqualRetBool(context, existingKey, key)
) {
GetExtensionRegistry(context).__delitem__(key);
GetInvertedRegistry(context).__delitem__(code);
} else {
throw PythonOps.ValueError("key {0} is not registered with code {1}", PythonOps.Repr(context, key), PythonOps.Repr(context, code));
}
}
[Documentation("__newobj__(cls, *args) -> cls.__new__(cls, *args)\n\n"
+ "Helper function for unpickling. Creates a new object of a given class.\n"
+ "See PEP 307 section \"The __newobj__ unpickling function\" for details."
)]
public static object __newobj__(CodeContext/*!*/ context, object cls, params object[] args) {
object[] newArgs = new object[1 + args.Length];
newArgs[0] = cls;
for (int i = 0; i < args.Length; i++) newArgs[i + 1] = args[i];
return PythonOps.Invoke(context, cls, "__new__", newArgs);
}
[Documentation("_reconstructor(basetype, objtype, basestate) -> object\n\n"
+ "Helper function for unpickling. Creates and initializes a new object of a given\n"
+ "class. See PEP 307 section \"Case 2: pickling new-style class instances using\n"
+ "protocols 0 or 1\" for details."
)]
public static object _reconstructor(CodeContext/*!*/ context, object objType, object baseType, object baseState) {
object obj;
if (baseState == null) {
obj = PythonOps.Invoke(context, baseType, "__new__", objType);
PythonOps.Invoke(context, baseType, "__init__", obj);
} else {
obj = PythonOps.Invoke(context, baseType, "__new__", objType, baseState);
PythonOps.Invoke(context, baseType, "__init__", obj, baseState);
}
return obj;
}
#endregion
#region Private implementation
/// <summary>
/// Convert object to ushort, throwing ValueError on overflow.
/// </summary>
private static int GetCode(CodeContext/*!*/ context, object value) {
try {
int intValue = context.LanguageContext.ConvertToInt32(value);
if (intValue > 0) return intValue;
// fall through and throw below
} catch (OverflowException) {
// throw below
}
throw PythonOps.ValueError("code out of range");
}
#endregion
private static void EnsureModuleInitialized(CodeContext context) {
if (!context.LanguageContext.HasModuleState(_dispatchTableKey)) {
Importer.ImportBuiltin(context, "copyreg");
}
}
[SpecialName]
public static void PerformModuleReload(PythonContext/*!*/ context, PythonDictionary/*!*/ dict) {
context.NewObject = (BuiltinFunction)dict["__newobj__"];
context.PythonReconstructor = (BuiltinFunction)dict["_reconstructor"];
PythonDictionary dispatchTable = new PythonDictionary();
dispatchTable[TypeCache.Complex] = dict["pickle_complex"];
context.SetModuleState(_dispatchTableKey, dict["dispatch_table"] = dispatchTable);
context.SetModuleState(_extensionRegistryKey, dict["_extension_registry"] = new PythonDictionary());
context.SetModuleState(_invertedRegistryKey, dict["_inverted_registry"] = new PythonDictionary());
context.SetModuleState(_extensionCacheKey, dict["_extension_cache"] = new PythonDictionary());
}
}
}