pythonnet/src/runtime/classmanager.cs at master · dmitriyse/pythonnet · GitHub

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using System;

using System.Collections;

using System.Collections.Generic;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Security;

namespace Python.Runtime

{

/// <summary>

/// The ClassManager is responsible for creating and managing instances

/// that implement the Python type objects that reflect managed classes.

/// Each managed type reflected to Python is represented by an instance

/// of a concrete subclass of ClassBase. Each instance is associated with

/// a generated Python type object, whose slots point to static methods

/// of the managed instance's class.

/// </summary>

internal class ClassManager

{

private static Dictionary<Type, ClassBase> cache;

private static Type dtype;

private ClassManager()

{

}

static ClassManager()

{

cache = new Dictionary<Type, ClassBase>(128);

// SEE: https://msdn.microsoft.com/en-us/library/96b1ayy4(v=vs.100).aspx

// ""All delegates inherit from MulticastDelegate, which inherits from Delegate.""

// Was Delegate, which caused a null MethodInfo returned from GetMethode("Invoke")

// and crashed on Linux under Mono.

dtype = typeof(MulticastDelegate);

}

/// <summary>

/// Return the ClassBase-derived instance that implements a particular

/// reflected managed type, creating it if it doesn't yet exist.

/// </summary>

internal static ClassBase GetClass(Type type)

{

ClassBase cb = null;

cache.TryGetValue(type, out cb);

if (cb != null)

{

return cb;

}

cb = CreateClass(type);

cache.Add(type, cb);

// Initialize the object later, as this might call this GetClass method

// recursively (for example when a nested class inherits its declaring class...)

InitClassBase(type, cb);

return cb;

}

/// <summary>

/// Create a new ClassBase-derived instance that implements a reflected

/// managed type. The new object will be associated with a generated

/// Python type object.

/// </summary>

private static ClassBase CreateClass(Type type)

{

// Next, select the appropriate managed implementation class.

// Different kinds of types, such as array types or interface

// types, want to vary certain implementation details to make

// sure that the type semantics are consistent in Python.

ClassBase impl;

// Check to see if the given type extends System.Exception. This

// lets us check once (vs. on every lookup) in case we need to

// wrap Exception-derived types in old-style classes

if (type.ContainsGenericParameters)

{

impl = new GenericType(type);

}

else if (type.IsSubclassOf(dtype))

{

impl = new DelegateObject(type);

}

else if (type.IsArray)

{

impl = new ArrayObject(type);

}

else if (type.IsInterface)

{

impl = new InterfaceObject(type);

}

else if (type == typeof(Exception) ||

type.IsSubclassOf(typeof(Exception)))

{

impl = new ExceptionClassObject(type);

}

else if (null != type.GetField("__pyobj__"))

{

impl = new ClassDerivedObject(type);

}

else

{

impl = new ClassObject(type);

}

return impl;

}

private static void InitClassBase(Type type, ClassBase impl)

{

// First, we introspect the managed type and build some class

// information, including generating the member descriptors

// that we'll be putting in the Python class __dict__.

ClassInfo info = GetClassInfo(type);

impl.indexer = info.indexer;

// Now we allocate the Python type object to reflect the given

// managed type, filling the Python type slots with thunks that

// point to the managed methods providing the implementation.

IntPtr tp = TypeManager.GetTypeHandle(impl, type);

impl.tpHandle = tp;

// Finally, initialize the class __dict__ and return the object.

IntPtr dict = Marshal.ReadIntPtr(tp, TypeOffset.tp_dict);

IDictionaryEnumerator iter = info.members.GetEnumerator();

while (iter.MoveNext())

{

var item = (ManagedType)iter.Value;

var name = (string)iter.Key;

Runtime.PyDict_SetItemString(dict, name, item.pyHandle);

}

// If class has constructors, generate an __doc__ attribute.

IntPtr doc = IntPtr.Zero;

Type marker = typeof(DocStringAttribute);

var attrs = (Attribute[])type.GetCustomAttributes(marker, false);

if (attrs.Length == 0)

{

doc = IntPtr.Zero;

}

else

{

var attr = (DocStringAttribute)attrs[0];

string docStr = attr.DocString;

doc = Runtime.PyString_FromString(docStr);

Runtime.PyDict_SetItemString(dict, "__doc__", doc);

Runtime.XDecref(doc);

}

var co = impl as ClassObject;

// If this is a ClassObject AND it has constructors, generate a __doc__ attribute.

// required that the ClassObject.ctors be changed to internal

if (co != null)

{

if (co.ctors.Length > 0)

{

// Implement Overloads on the class object

if (!CLRModule._SuppressOverloads)

{

var ctors = new ConstructorBinding(type, tp, co.binder);

// ExtensionType types are untracked, so don't Incref() them.

// TODO: deprecate __overloads__ soon...

Runtime.PyDict_SetItemString(dict, "__overloads__", ctors.pyHandle);

Runtime.PyDict_SetItemString(dict, "Overloads", ctors.pyHandle);

}

// don't generate the docstring if one was already set from a DocStringAttribute.

if (!CLRModule._SuppressDocs && doc == IntPtr.Zero)

{

doc = co.GetDocString();

Runtime.PyDict_SetItemString(dict, "__doc__", doc);

Runtime.XDecref(doc);

}

private static ClassInfo GetClassInfo(Type type)

{

var ci = new ClassInfo(type);

var methods = new Hashtable();

ArrayList list;

MethodInfo meth;

ManagedType ob;

string name;

object item;

Type tp;

int i, n;

// This is complicated because inheritance in Python is name

// based. We can't just find DeclaredOnly members, because we

// could have a base class A that defines two overloads of a

// method and a class B that defines two more. The name-based

// descriptor Python will find needs to know about inherited

// overloads as well as those declared on the sub class.

BindingFlags flags = BindingFlags.Static |

BindingFlags.Instance |

BindingFlags.Public |

BindingFlags.NonPublic;

MemberInfo[] info = type.GetMembers(flags);

var local = new Hashtable();

var items = new ArrayList();

MemberInfo m;

// Loop through once to find out which names are declared

for (i = 0; i < info.Length; i++)

{

m = info[i];

if (m.DeclaringType == type)

{

local[m.Name] = 1;

}

// Now again to filter w/o losing overloaded member info

for (i = 0; i < info.Length; i++)

{

m = info[i];

if (local[m.Name] != null)

{

items.Add(m);

}

if (type.IsInterface)

{

// Interface inheritance seems to be a different animal:

// more contractual, less structural. Thus, a Type that

// represents an interface that inherits from another

// interface does not return the inherited interface's

// methods in GetMembers. For example ICollection inherits

// from IEnumerable, but ICollection's GetMemebers does not

// return GetEnumerator.

// Not sure if this is the correct way to fix this, but it

// seems to work. Thanks to Bruce Dodson for the fix.

Type[] inheritedInterfaces = type.GetInterfaces();

for (i = 0; i < inheritedInterfaces.Length; ++i)

{

Type inheritedType = inheritedInterfaces[i];

MemberInfo[] imembers = inheritedType.GetMembers(flags);

for (n = 0; n < imembers.Length; n++)

{

m = imembers[n];

if (local[m.Name] == null)

{

items.Add(m);

}

for (i = 0; i < items.Count; i++)

{

var mi = (MemberInfo)items[i];

switch (mi.MemberType)

{

case MemberTypes.Method:

meth = (MethodInfo)mi;

if (!(meth.IsPublic || meth.IsFamily ||

meth.IsFamilyOrAssembly))

{

continue;

}

name = meth.Name;

item = methods[name];

if (item == null)

{

item = methods[name] = new ArrayList();

}

list = (ArrayList)item;

list.Add(meth);

continue;

case MemberTypes.Property:

var pi = (PropertyInfo)mi;

MethodInfo mm = null;

try

{

mm = pi.GetGetMethod(true);

if (mm == null)

{

mm = pi.GetSetMethod(true);

}

catch (SecurityException)

{

// GetGetMethod may try to get a method protected by

// StrongNameIdentityPermission - effectively private.

continue;

}

if (mm == null)

{

continue;

}

if (!(mm.IsPublic || mm.IsFamily || mm.IsFamilyOrAssembly))

{

continue;

}

// Check for indexer

ParameterInfo[] args = pi.GetIndexParameters();

if (args.GetLength(0) > 0)

{

Indexer idx = ci.indexer;

if (idx == null)

{

ci.indexer = new Indexer();

idx = ci.indexer;

}

idx.AddProperty(pi);

continue;

}

ob = new PropertyObject(pi);

ci.members[pi.Name] = ob;

continue;

case MemberTypes.Field:

var fi = (FieldInfo)mi;

if (!(fi.IsPublic || fi.IsFamily || fi.IsFamilyOrAssembly))

{

continue;

}

ob = new FieldObject(fi);

ci.members[mi.Name] = ob;

continue;

case MemberTypes.Event:

var ei = (EventInfo)mi;

MethodInfo me = ei.GetAddMethod(true);

if (!(me.IsPublic || me.IsFamily || me.IsFamilyOrAssembly))

{

continue;

}

ob = new EventObject(ei);

ci.members[ei.Name] = ob;

continue;

case MemberTypes.NestedType:

tp = (Type)mi;

if (!(tp.IsNestedPublic || tp.IsNestedFamily ||

tp.IsNestedFamORAssem))

{

continue;

}

// Note the given instance might be uninitialized

ob = GetClass(tp);

ci.members[mi.Name] = ob;

continue;

}

IDictionaryEnumerator iter = methods.GetEnumerator();

while (iter.MoveNext())

{

name = (string)iter.Key;

list = (ArrayList)iter.Value;

var mlist = (MethodInfo[])list.ToArray(typeof(MethodInfo));

ob = new MethodObject(type, name, mlist);

ci.members[name] = ob;

}

return ci;

}

internal class ClassInfo

{

public Indexer indexer;

public Hashtable members;

internal ClassInfo(Type t)

{

members = new Hashtable();

indexer = null;

}

pythonnet/src/runtime/classmanager.cs at master · dmitriyse/pythonnet · GitHub

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