forked from IronLanguages/main
/
OldClass.cs
633 lines (510 loc) · 22 KB
/
OldClass.cs
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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if !CLR2
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Dynamic;
using System.Runtime.Serialization;
using System.Threading;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using IronPython.Runtime.Operations;
using SpecialNameAttribute = System.Runtime.CompilerServices.SpecialNameAttribute;
namespace IronPython.Runtime.Types {
// OldClass represents the type of old-style Python classes (which could not inherit from
// built-in Python types).
//
// Object instances of old-style Python classes are represented by OldInstance.
//
// UserType is the equivalent of OldClass for new-style Python classes (which can inherit
// from built-in types).
[Flags]
enum OldClassAttributes {
None = 0x00,
HasFinalizer = 0x01,
HasSetAttr = 0x02,
HasDelAttr = 0x04,
}
[PythonType("classobj"), DontMapGetMemberNamesToDir]
[Serializable]
[DebuggerTypeProxy(typeof(OldClass.OldClassDebugView)), DebuggerDisplay("old-style class {Name}")]
public sealed class OldClass :
#if !SILVERLIGHT // ICustomTypeDescriptor
ICustomTypeDescriptor,
#endif
ICodeFormattable,
IMembersList,
IDynamicMetaObjectProvider,
IPythonMembersList {
[NonSerialized]
private List<OldClass> _bases;
private PythonType _type;
internal PythonDictionary _dict;
private int _attrs; // actually OldClassAttributes - losing type safety for thread safety
internal object _name;
private int _optimizedInstanceNamesVersion;
private string[] _optimizedInstanceNames;
public static string __doc__ = "classobj(name, bases, dict)";
public static object __new__(CodeContext/*!*/ context, [NotNull]PythonType cls, string name, PythonTuple bases, PythonDictionary/*!*/ dict) {
if (dict == null) {
throw PythonOps.TypeError("dict must be a dictionary");
} else if (cls != TypeCache.OldClass) {
throw PythonOps.TypeError("{0} is not a subtype of classobj", cls.Name);
}
if (!dict.ContainsKey("__module__")) {
object moduleValue;
if (context.TryGetGlobalVariable("__name__", out moduleValue)) {
dict["__module__"] = moduleValue;
}
}
foreach (object o in bases) {
if (o is PythonType) {
return PythonOps.MakeClass(context, name, bases._data, String.Empty, dict);
}
}
return new OldClass(name, bases, dict, String.Empty);
}
internal OldClass(string name, PythonTuple bases, PythonDictionary/*!*/ dict, string instanceNames) {
_bases = ValidateBases(bases);
Init(name, dict, instanceNames);
}
private void Init(string name, PythonDictionary/*!*/ dict, string instanceNames) {
_name = name;
InitializeInstanceNames(instanceNames);
_dict = dict;
if (!_dict._storage.Contains("__doc__")) {
_dict._storage.Add("__doc__", null);
}
CheckSpecialMethods(_dict);
}
private void CheckSpecialMethods(PythonDictionary dict) {
if (dict._storage.Contains("__del__")) {
HasFinalizer = true;
}
if (dict._storage.Contains("__setattr__")) {
HasSetAttr = true;
}
if (dict._storage.Contains("__delattr__")) {
HasDelAttr = true;
}
foreach (OldClass oc in _bases) {
if (oc.HasDelAttr) {
HasDelAttr = true;
}
if (oc.HasSetAttr) {
HasSetAttr = true;
}
if (oc.HasFinalizer) {
HasFinalizer = true;
}
}
}
#if !SILVERLIGHT // SerializationInfo
private OldClass(SerializationInfo info, StreamingContext context) {
_bases = (List<OldClass>)info.GetValue("__class__", typeof(List<OldClass>));
_name = info.GetValue("__name__", typeof(object));
_dict = new PythonDictionary();
InitializeInstanceNames(""); //TODO should we serialize the optimization data
List<object> keys = (List<object>)info.GetValue("keys", typeof(List<object>));
List<object> values = (List<object>)info.GetValue("values", typeof(List<object>));
for (int i = 0; i < keys.Count; i++) {
_dict[keys[i]] = values[i];
}
if (_dict.has_key("__del__")) HasFinalizer = true;
}
#pragma warning disable 169 // unused method - called via reflection from serialization
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "context")]
private void GetObjectData(SerializationInfo info, StreamingContext context) {
ContractUtils.RequiresNotNull(info, "info");
info.AddValue("__bases__", _bases);
info.AddValue("__name__", _name);
List<object> keys = new List<object>();
List<object> values = new List<object>();
foreach (KeyValuePair<object, object> kvp in _dict._storage.GetItems()) {
keys.Add(kvp.Key);
values.Add(kvp.Value);
}
info.AddValue("keys", keys);
info.AddValue("values", values);
}
#pragma warning restore 169
#endif
private void InitializeInstanceNames(string instanceNames) {
if (instanceNames.Length == 0) {
_optimizedInstanceNames = ArrayUtils.EmptyStrings;
_optimizedInstanceNamesVersion = 0;
return;
}
string[] names = instanceNames.Split(',');
_optimizedInstanceNames = new string[names.Length];
for (int i = 0; i < names.Length; i++) {
_optimizedInstanceNames[i] = names[i];
}
_optimizedInstanceNamesVersion = CustomInstanceDictionaryStorage.AllocateVersion();
}
internal string[] OptimizedInstanceNames {
get { return _optimizedInstanceNames; }
}
internal int OptimizedInstanceNamesVersion {
get { return _optimizedInstanceNamesVersion; }
}
internal string Name {
get { return _name.ToString(); }
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1007:UseGenericsWhereAppropriate")]
internal bool TryLookupSlot(string name, out object ret) {
if (_dict._storage.TryGetValue(name, out ret)) {
return true;
}
// bases only ever contains OldClasses (tuples are immutable, and when assigned
// to we verify the types in the Tuple)
foreach (OldClass c in _bases) {
if (c.TryLookupSlot(name, out ret)) return true;
}
ret = null;
return false;
}
internal bool TryLookupOneSlot(PythonType lookingType, string name, out object ret) {
if (_dict._storage.TryGetValue(name, out ret)) {
ret = GetOldStyleDescriptor(TypeObject.Context.SharedContext, ret, null, lookingType);
return true;
}
return false;
}
internal string FullName {
get { return _dict["__module__"].ToString() + '.' + _name; }
}
internal List<OldClass> BaseClasses {
get {
return _bases;
}
}
internal object GetOldStyleDescriptor(CodeContext context, object self, object instance, object type) {
PythonTypeSlot dts = self as PythonTypeSlot;
object callable;
if (dts != null && dts.TryGetValue(context, instance, TypeObject, out callable)) {
return callable;
}
return PythonOps.GetUserDescriptor(self, instance, type);
}
internal static object GetOldStyleDescriptor(CodeContext context, object self, object instance, PythonType type) {
PythonTypeSlot dts = self as PythonTypeSlot;
object callable;
if (dts != null && dts.TryGetValue(context, instance, type, out callable)) {
return callable;
}
return PythonOps.GetUserDescriptor(self, instance, type);
}
internal bool HasFinalizer {
get {
return (_attrs & (int)OldClassAttributes.HasFinalizer) != 0;
}
set {
int oldAttrs, newAttrs;
do {
oldAttrs = _attrs;
newAttrs = value ? oldAttrs | ((int)OldClassAttributes.HasFinalizer) : oldAttrs & ((int)~OldClassAttributes.HasFinalizer);
} while (Interlocked.CompareExchange(ref _attrs, newAttrs, oldAttrs) != oldAttrs);
}
}
internal bool HasSetAttr {
get {
return (_attrs & (int)OldClassAttributes.HasSetAttr) != 0;
}
set {
int oldAttrs, newAttrs;
do {
oldAttrs = _attrs;
newAttrs = value ? oldAttrs | ((int)OldClassAttributes.HasSetAttr) : oldAttrs & ((int)~OldClassAttributes.HasSetAttr);
} while (Interlocked.CompareExchange(ref _attrs, newAttrs, oldAttrs) != oldAttrs);
}
}
internal bool HasDelAttr {
get {
return (_attrs & (int)OldClassAttributes.HasDelAttr) != 0;
}
set {
int oldAttrs, newAttrs;
do {
oldAttrs = _attrs;
newAttrs = value ? oldAttrs | ((int)OldClassAttributes.HasDelAttr) : oldAttrs & ((int)~OldClassAttributes.HasDelAttr);
} while (Interlocked.CompareExchange(ref _attrs, newAttrs, oldAttrs) != oldAttrs);
}
}
public override string ToString() {
return FullName;
}
#region Calls
// Calling an OldClass instance means instantiating that class and invoking the __init__() member if
// it's defined.
// OldClass impls IDynamicMetaObjectProvider. But May wind up here still if IDynamicObj doesn't provide a rule (such as for list sigs).
// If our IDynamicMetaObjectProvider implementation is complete, we can then remove these Call methods.
[SpecialName]
public object Call(CodeContext context, [NotNull]params object[] args\u00F8) {
OldInstance inst = new OldInstance(context, this);
object value;
// lookup the slot directly - we don't go through __getattr__
// until after the instance is created.
if (TryLookupSlot("__init__", out value)) {
PythonOps.CallWithContext(context, GetOldStyleDescriptor(context, value, inst, this), args\u00F8);
} else if (args\u00F8.Length > 0) {
MakeCallError();
}
return inst;
}
[SpecialName]
public object Call(CodeContext context, [ParamDictionary]IDictionary<object, object> dict\u00F8, [NotNull]params object[] args\u00F8) {
OldInstance inst = new OldInstance(context, this);
object meth;
if (PythonOps.TryGetBoundAttr(inst, "__init__", out meth)) {
PythonCalls.CallWithKeywordArgs(context, meth, args\u00F8, dict\u00F8);
} else if (dict\u00F8.Count > 0 || args\u00F8.Length > 0) {
MakeCallError();
}
return inst;
}
#endregion // calls
internal PythonType TypeObject {
get {
if (_type == null) {
Interlocked.CompareExchange(ref _type, new PythonType(this), null);
}
return _type;
}
}
private List<OldClass> ValidateBases(object value) {
PythonTuple t = value as PythonTuple;
if (t == null) throw PythonOps.TypeError("__bases__ must be a tuple object");
List<OldClass> res = new List<OldClass>(t.__len__());
foreach (object o in t) {
OldClass oc = o as OldClass;
if (oc == null) throw PythonOps.TypeError("__bases__ items must be classes (got {0})", PythonTypeOps.GetName(o));
if (oc.IsSubclassOf(this)) {
throw PythonOps.TypeError("a __bases__ item causes an inheritance cycle");
}
res.Add(oc);
}
return res;
}
internal object GetMember(CodeContext context, string name) {
object value;
if (!TryGetBoundCustomMember(context, name, out value)) {
throw PythonOps.AttributeError("type object '{0}' has no attribute '{1}'", Name, name);
}
return value;
}
internal bool TryGetBoundCustomMember(CodeContext context, string name, out object value) {
if (name == "__bases__") { value = PythonTuple.Make(_bases); return true; }
if (name == "__name__") { value = _name; return true; }
if (name == "__dict__") {
//!!! user code can modify __del__ property of __dict__ behind our back
HasDelAttr = HasSetAttr = true; // pessimisticlly assume the user is setting __setattr__ in the dict
value = _dict; return true;
}
if (TryLookupSlot(name, out value)) {
value = GetOldStyleDescriptor(context, value, null, this);
return true;
}
return false;
}
internal bool DeleteCustomMember(CodeContext context, string name) {
if (!_dict._storage.Remove(name)) {
throw PythonOps.AttributeError("{0} is not a valid attribute", name);
}
if (name == "__del__") {
HasFinalizer = false;
}
if (name == "__setattr__") {
HasSetAttr = false;
}
if (name == "__delattr__") {
HasDelAttr = false;
}
return true;
}
internal static void RecurseAttrHierarchy(OldClass oc, IDictionary<object, object> attrs) {
foreach (KeyValuePair<object, object> kvp in oc._dict._storage.GetItems()) {
if (!attrs.ContainsKey(kvp.Key)) {
attrs.Add(kvp.Key, kvp.Key);
}
}
// recursively get attrs in parent hierarchy
if (oc._bases.Count != 0) {
foreach (OldClass parent in oc._bases) {
RecurseAttrHierarchy(parent, attrs);
}
}
}
#region IMembersList Members
IList<string> IMembersList.GetMemberNames() {
return PythonOps.GetStringMemberList(this);
}
IList<object> IPythonMembersList.GetMemberNames(CodeContext/*!*/ context) {
PythonDictionary attrs = new PythonDictionary(_dict);
RecurseAttrHierarchy(this, attrs);
return PythonOps.MakeListFromSequence(attrs);
}
#endregion
internal bool IsSubclassOf(object other) {
if (this == other) return true;
OldClass dt = other as OldClass;
if (dt == null) return false;
List<OldClass> bases = _bases;
foreach (OldClass bc in bases) {
if (bc.IsSubclassOf(other)) {
return true;
}
}
return false;
}
#region ICustomTypeDescriptor Members
#if !SILVERLIGHT // ICustomTypeDescriptor
AttributeCollection ICustomTypeDescriptor.GetAttributes() {
return CustomTypeDescHelpers.GetAttributes(this);
}
string ICustomTypeDescriptor.GetClassName() {
return CustomTypeDescHelpers.GetClassName(this);
}
string ICustomTypeDescriptor.GetComponentName() {
return CustomTypeDescHelpers.GetComponentName(this);
}
TypeConverter ICustomTypeDescriptor.GetConverter() {
return CustomTypeDescHelpers.GetConverter(this);
}
EventDescriptor ICustomTypeDescriptor.GetDefaultEvent() {
return CustomTypeDescHelpers.GetDefaultEvent(this);
}
PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty() {
return CustomTypeDescHelpers.GetDefaultProperty(this);
}
object ICustomTypeDescriptor.GetEditor(Type editorBaseType) {
return CustomTypeDescHelpers.GetEditor(this, editorBaseType);
}
EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes) {
return CustomTypeDescHelpers.GetEvents(attributes);
}
EventDescriptorCollection ICustomTypeDescriptor.GetEvents() {
return CustomTypeDescHelpers.GetEvents(this);
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes) {
return CustomTypeDescHelpers.GetProperties(attributes);
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties() {
return CustomTypeDescHelpers.GetProperties(this);
}
object ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd) {
return CustomTypeDescHelpers.GetPropertyOwner(this, pd);
}
#endif
#endregion
#region ICodeFormattable Members
public string/*!*/ __repr__(CodeContext/*!*/ context) {
return string.Format("<class {0} at {1}>", FullName, PythonOps.HexId(this));
}
#endregion
#region Internal Member Accessors
internal bool TryLookupInit(object inst, out object ret) {
if (TryLookupSlot("__init__", out ret)) {
ret = GetOldStyleDescriptor(DefaultContext.Default, ret, inst, this);
return true;
}
return false;
}
internal static object MakeCallError() {
// Normally, if we have an __init__ method, the method binder detects signature mismatches.
// This can happen when a class does not define __init__ and therefore does not take any arguments.
// Beware that calls like F(*(), **{}) have 2 arguments but they're empty and so it should still
// match against def F().
throw PythonOps.TypeError("this constructor takes no arguments");
}
internal void SetBases(object value) {
_bases = ValidateBases(value);
}
internal void SetName(object value) {
string n = value as string;
if (n == null) throw PythonOps.TypeError("TypeError: __name__ must be a string object");
_name = n;
}
internal void SetDictionary(object value) {
PythonDictionary d = value as PythonDictionary;
if (d == null) throw PythonOps.TypeError("__dict__ must be set to dictionary");
_dict = d;
}
internal void SetNameHelper(string name, object value) {
_dict._storage.Add(name, value);
if (name == "__del__") {
HasFinalizer = true;
} else if (name == "__setattr__") {
HasSetAttr = true;
} else if (name == "__delattr__") {
HasDelAttr = true;
}
}
internal object LookupValue(CodeContext context, string name) {
object value;
if (TryLookupValue(context, name, out value)) {
return value;
}
throw PythonOps.AttributeErrorForMissingAttribute(this, name);
}
internal bool TryLookupValue(CodeContext context, string name, out object value) {
if (TryLookupSlot(name, out value)) {
value = GetOldStyleDescriptor(context, value, null, this);
return true;
}
return false;
}
internal void DictionaryIsPublic() {
HasDelAttr = true;
HasSetAttr = true;
}
#endregion
#region IDynamicMetaObjectProvider Members
DynamicMetaObject/*!*/ IDynamicMetaObjectProvider.GetMetaObject(Expression/*!*/ parameter) {
return new Binding.MetaOldClass(parameter, BindingRestrictions.Empty, this);
}
#endregion
internal class OldClassDebugView {
private readonly OldClass _class;
public OldClassDebugView(OldClass klass) {
_class = klass;
}
public List<OldClass> __bases__ {
get {
return _class.BaseClasses;
}
}
[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
internal List<ObjectDebugView> Members {
get {
var res = new List<ObjectDebugView>();
if (_class._dict != null) {
foreach (var v in _class._dict) {
res.Add(new ObjectDebugView(v.Key, v.Value));
}
}
return res;
}
}
}
}
}