pythonnet/src/runtime/Types/ModuleObject.cs at master · generalloki/pythonnet · GitHub

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Reflection;

namespace Python.Runtime

{

/// <summary>

/// Implements a Python type that provides access to CLR namespaces. The

/// type behaves like a Python module, and can contain other sub-modules.

/// </summary>

[Serializable]

internal class ModuleObject : ExtensionType

{

private readonly Dictionary<string, PyObject> cache = new();

internal string moduleName;

internal PyDict dict;

protected string _namespace;

private readonly PyList __all__ = new ();

// Attributes to be set on the module according to PEP302 and 451

// by the import machinery.

static readonly HashSet<string?> settableAttributes =

new () {"__spec__", "__file__", "__name__", "__path__", "__loader__", "__package__"};

#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

/// <remarks><seealso cref="dict"/> is initialized in <seealso cref="Create(string)"/></remarks>

protected ModuleObject(string name)

#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.

{

if (name == string.Empty)

{

throw new ArgumentException("Name must not be empty!");

}

moduleName = name;

_namespace = name;

}

internal static NewReference Create(string name) => new ModuleObject(name).Alloc();

public override NewReference Alloc()

{

var py = base.Alloc();

if (dict is null)

{

// Use the filename from any of the assemblies just so there's something for

// anything that expects __file__ to be set.

var filename = "unknown";

var docstring = "Namespace containing types from the following assemblies:\n\n";

foreach (Assembly a in AssemblyManager.GetAssemblies(moduleName))

{

if (!a.IsDynamic && a.Location != null)

{

filename = a.Location;

}

docstring += "- " + a.FullName + "\n";

}

using var dictRef = Runtime.PyObject_GenericGetDict(py.Borrow());

dict = new PyDict(dictRef.StealOrThrow());

using var pyname = Runtime.PyString_FromString(moduleName);

using var pyfilename = Runtime.PyString_FromString(filename);

using var pydocstring = Runtime.PyString_FromString(docstring);

BorrowedReference pycls = TypeManager.GetTypeReference(GetType());

Runtime.PyDict_SetItem(dict, PyIdentifier.__name__, pyname.Borrow());

Runtime.PyDict_SetItem(dict, PyIdentifier.__file__, pyfilename.Borrow());

Runtime.PyDict_SetItem(dict, PyIdentifier.__doc__, pydocstring.Borrow());

Runtime.PyDict_SetItem(dict, PyIdentifier.__class__, pycls);

}

else

{

SetObjectDict(py.Borrow(), new NewReference(dict).Steal());

}

InitializeModuleMembers();

return py;

}

/// <summary>

/// Returns a ClassBase object representing a type that appears in

/// this module's namespace or a ModuleObject representing a child

/// namespace (or null if the name is not found). This method does

/// not increment the Python refcount of the returned object.

/// </summary>

public NewReference GetAttribute(string name, bool guess)

{

cache.TryGetValue(name, out var cached);

if (cached != null)

{

return new NewReference(cached);

}

Type type;

//if (AssemblyManager.IsValidNamespace(name))

//{

// IntPtr py_mod_name = Runtime.PyString_FromString(name);

// IntPtr modules = Runtime.PyImport_GetModuleDict();

// IntPtr module = Runtime.PyDict_GetItem(modules, py_mod_name);

// if (module != IntPtr.Zero)

// return (ManagedType)this;

// return null;

//}

string qname = _namespace == string.Empty

? name

: _namespace + "." + name;

// If the fully-qualified name of the requested attribute is

// a namespace exported by a currently loaded assembly, return

// a new ModuleObject representing that namespace.

if (AssemblyManager.IsValidNamespace(qname))

{

var m = ModuleObject.Create(qname);

this.StoreAttribute(name, m.Borrow());

return m;

}

// Look for a type in the current namespace. Note that this

// includes types, delegates, enums, interfaces and structs.

// Only public namespace members are exposed to Python.

type = AssemblyManager.LookupTypes(qname).FirstOrDefault(t => t.IsPublic);

if (type != null)

{

var c = ClassManager.GetClass(type);

StoreAttribute(name, c);

return new NewReference(c);

}

// We didn't find the name, so we may need to see if there is a

// generic type with this base name. If so, we'll go ahead and

// return it. Note that we store the mapping of the unmangled

// name to generic type - it is technically possible that some

// future assembly load could contribute a non-generic type to

// the current namespace with the given basename, but unlikely

// enough to complicate the implementation for now.

if (guess)

{

string? gname = GenericUtil.GenericNameForBaseName(this._namespace, name);

if (gname != null)

{

var o = this.GetAttribute(gname, false);

if (!o.IsNull())

{

this.StoreAttribute(name, o.Borrow());

return o;

}

return default;

}

/// <summary>

/// Stores an attribute in the instance dict for future lookups.

/// </summary>

private void StoreAttribute(string name, BorrowedReference ob)

{

if (Runtime.PyDict_SetItemString(dict, name, ob) != 0)

{

throw PythonException.ThrowLastAsClrException();

}

cache[name] = new PyObject(ob);

}

/// <summary>

/// Preloads all currently-known names for the module namespace. This

/// can be called multiple times, to add names from assemblies that

/// may have been loaded since the last call to the method.

/// </summary>

public void LoadNames()

{

foreach (string name in AssemblyManager.GetNames(_namespace))

{

cache.TryGetValue(name, out var m);

if (m != null)

{

continue;

}

BorrowedReference attr = Runtime.PyDict_GetItemString(dict, name);

// If __dict__ has already set a custom property, skip it.

if (!attr.IsNull)

{

continue;

}

using var attrVal = GetAttribute(name, true);

if (!attrVal.IsNull())

{

// if it's a valid attribute, add it to __all__

using var pyname = Runtime.PyString_FromString(name);

if (Runtime.PyList_Append(__all__, pyname.Borrow()) != 0)

{

throw PythonException.ThrowLastAsClrException();

}

const BindingFlags ModuleMethodFlags = BindingFlags.Public | BindingFlags.Static;

/// <summary>

/// Initialize module level functions and attributes

/// </summary>

internal void InitializeModuleMembers()

{

Type funcmarker = typeof(ModuleFunctionAttribute);

Type propmarker = typeof(ModulePropertyAttribute);

Type ftmarker = typeof(ForbidPythonThreadsAttribute);

Type type = GetType();

while (type != null)

{

MethodInfo[] methods = type.GetMethods(ModuleMethodFlags);

foreach (MethodInfo method in methods)

{

object[] attrs = method.GetCustomAttributes(funcmarker, false);

object[] forbid = method.GetCustomAttributes(ftmarker, false);

bool allow_threads = forbid.Length == 0;

if (attrs.Length > 0)

{

string name = method.Name;

var mi = new MethodInfo[1];

mi[0] = method;

using var m = new ModuleFunctionObject(type, name, mi, allow_threads).Alloc();

StoreAttribute(name, m.Borrow());

}

PropertyInfo[] properties = type.GetProperties();

foreach (PropertyInfo property in properties)

{

object[] attrs = property.GetCustomAttributes(propmarker, false);

if (attrs.Length > 0)

{

string name = property.Name;

using var p = new ModulePropertyObject(property).Alloc();

StoreAttribute(name, p.Borrow());

}

type = type.BaseType;

}

internal void ResetModuleMembers()

{

Type type = GetType();

var methods = type.GetMethods(ModuleMethodFlags)

.Where(m => m.GetCustomAttribute<ModuleFunctionAttribute>() is not null)

.OfType<MemberInfo>();

var properties = type.GetProperties().Where(p => p.GetCustomAttribute<ModulePropertyAttribute>() is not null);

foreach (string memberName in methods.Concat(properties).Select(m => m.Name))

{

if (Runtime.PyDict_DelItemString(dict, memberName) != 0)

{

if (!PythonException.CurrentMatches(Exceptions.KeyError))

{

throw PythonException.ThrowLastAsClrException();

}

Runtime.PyErr_Clear();

}

cache.Remove(memberName);

}

/// <summary>

/// ModuleObject __getattribute__ implementation. Module attributes

/// are always either classes or sub-modules representing subordinate

/// namespaces. CLR modules implement a lazy pattern - the sub-modules

/// and classes are created when accessed and cached for future use.

/// </summary>

public static NewReference tp_getattro(BorrowedReference ob, BorrowedReference key)

{

var self = (ModuleObject)GetManagedObject(ob)!;

if (!Runtime.PyString_Check(key))

{

Exceptions.SetError(Exceptions.TypeError, "string expected");

return default;

}

Debug.Assert(!self.dict.IsDisposed);

BorrowedReference op = Runtime.PyDict_GetItem(self.dict, key);

if (op != null)

{

return new NewReference(op);

}

string? name = InternString.GetManagedString(key);

if (name == "__dict__")

{

return new NewReference(self.dict);

}

if (name == "__all__")

{

self.LoadNames();

return new NewReference(self.__all__);

}

NewReference attr;

try

{

if (name is null) throw new ArgumentNullException();

attr = self.GetAttribute(name, true);

}

catch (Exception e)

{

Exceptions.SetError(e);

return default;

}

if (attr.IsNull())

{

Exceptions.SetError(Exceptions.AttributeError, name);

return default;

}

return attr;

}

/// <summary>

/// ModuleObject __repr__ implementation.

/// </summary>

public static NewReference tp_repr(BorrowedReference ob)

{

var self = (ModuleObject)GetManagedObject(ob)!;

return Runtime.PyString_FromString($"<module '{self.moduleName}'>");

}

public static int tp_traverse(BorrowedReference ob, IntPtr visit, IntPtr arg)

{

var self = (ModuleObject?)GetManagedObject(ob);

if (self is null) return 0;

Debug.Assert(self.dict == GetObjectDict(ob));

int res = PyVisit(self.dict, visit, arg);

if (res != 0) return res;

foreach (var attr in self.cache.Values)

{

res = PyVisit(attr, visit, arg);

if (res != 0) return res;

}

return 0;

}

/// <summary>

/// Override the setattr implementation.

/// This is needed because the import mechanics need

/// to set a few attributes

/// </summary>

[ForbidPythonThreads]

public new static int tp_setattro(BorrowedReference ob, BorrowedReference key, BorrowedReference val)

{

var managedKey = Runtime.GetManagedString(key);

if ((settableAttributes.Contains(managedKey)) ||

(ManagedType.GetManagedObject(val) is ModuleObject) )

{

var self = (ModuleObject)ManagedType.GetManagedObject(ob)!;

return Runtime.PyDict_SetItem(self.dict, key, val);

}

return ExtensionType.tp_setattro(ob, key, val);

}

protected override Dictionary<string, object?>? OnSave(BorrowedReference ob)

{

var context = base.OnSave(ob);

System.Diagnostics.Debug.Assert(dict == GetObjectDict(ob));

// destroy the cache(s)

foreach (var pair in cache)

{

if ((Runtime.PyDict_DelItemString(dict, pair.Key) == -1) &&

(Exceptions.ExceptionMatches(Exceptions.KeyError)))

{

// Trying to remove a key that's not in the dictionary

// raises an error. We don't care about it.

Runtime.PyErr_Clear();

}

else if (Exceptions.ErrorOccurred())

{

throw PythonException.ThrowLastAsClrException();

}

cache.Clear();

return context;

}

protected override void OnLoad(BorrowedReference ob, Dictionary<string, object?>? context)

{

base.OnLoad(ob, context);

SetObjectDict(ob, new NewReference(dict).Steal());

}

pythonnet/src/runtime/Types/ModuleObject.cs at master · generalloki/pythonnet · GitHub

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