| private PyDict_GetItem ( IntPtr pointer, IntPtr key ) : IntPtr | ||
| pointer | IntPtr | |
| key | IntPtr | |
| return | IntPtr | |
/// <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 IntPtr tp_getattro(IntPtr ob, IntPtr key)
{
var self = (ModuleObject)GetManagedObject(ob);
if (!Runtime.PyString_Check(key))
{
Exceptions.SetError(Exceptions.TypeError, "string expected");
return(IntPtr.Zero);
}
IntPtr op = Runtime.PyDict_GetItem(self.dict, key);
if (op != IntPtr.Zero)
{
Runtime.XIncref(op);
return(op);
}
string name = Runtime.GetManagedString(key);
if (name == "__dict__")
{
Runtime.XIncref(self.dict);
return(self.dict);
}
ManagedType attr = null;
try
{
attr = self.GetAttribute(name, true);
}
catch (Exception e)
{
Exceptions.SetError(e);
return(IntPtr.Zero);
}
if (attr == null)
{
Exceptions.SetError(Exceptions.AttributeError, name);
return(IntPtr.Zero);
}
Runtime.XIncref(attr.pyHandle);
return(attr.pyHandle);
}
/// <summary>
/// The actual import hook that ties Python to the managed world.
/// </summary>
public static IntPtr __import__(IntPtr self, IntPtr argsRaw, IntPtr kw)
{
var args = new BorrowedReference(argsRaw);
// Replacement for the builtin __import__. The original import
// hook is saved as this.py_import. This version handles CLR
// import and defers to the normal builtin for everything else.
var num_args = Runtime.PyTuple_Size(args);
if (num_args < 1)
{
return(Exceptions.RaiseTypeError("__import__() takes at least 1 argument (0 given)"));
}
BorrowedReference py_mod_name = Runtime.PyTuple_GetItem(args, 0);
if (py_mod_name.IsNull ||
!Runtime.IsStringType(py_mod_name))
{
return(Exceptions.RaiseTypeError("string expected"));
}
// Check whether the import is of the form 'from x import y'.
// This determines whether we return the head or tail module.
BorrowedReference fromList = default;
var fromlist = false;
if (num_args >= 4)
{
fromList = Runtime.PyTuple_GetItem(args, 3);
if (fromList != null &&
Runtime.PyObject_IsTrue(fromList) == 1)
{
fromlist = true;
}
}
string mod_name = Runtime.GetManagedString(py_mod_name);
// Check these BEFORE the built-in import runs; may as well
// do the Incref()ed return here, since we've already found
// the module.
if (mod_name == "clr")
{
NewReference clr_module = GetCLRModule(fromList);
if (!clr_module.IsNull())
{
BorrowedReference sys_modules = Runtime.PyImport_GetModuleDict();
if (!sys_modules.IsNull)
{
Runtime.PyDict_SetItemString(sys_modules, "clr", clr_module);
}
}
return(clr_module.DangerousMoveToPointerOrNull());
}
string realname = mod_name;
// 2010-08-15: Always seemed smart to let python try first...
// This shaves off a few tenths of a second on test_module.py
// and works around a quirk where 'sys' is found by the
// LoadImplicit() deprecation logic.
// Turns out that the AssemblyManager.ResolveHandler() checks to see if any
// Assembly's FullName.ToLower().StartsWith(name.ToLower()), which makes very
// little sense to me.
IntPtr res = Runtime.PyObject_Call(py_import, args.DangerousGetAddress(), kw);
if (res != IntPtr.Zero)
{
// There was no error.
if (fromlist && IsLoadAll(fromList))
{
var mod = ManagedType.GetManagedObject(res) as ModuleObject;
mod?.LoadNames();
}
return(res);
}
// There was an error
if (!Exceptions.ExceptionMatches(Exceptions.ImportError))
{
// and it was NOT an ImportError; bail out here.
return(IntPtr.Zero);
}
if (mod_name == string.Empty)
{
// Most likely a missing relative import.
// For example site-packages\bs4\builder\__init__.py uses it to check if a package exists:
// from . import _html5lib
// We don't support them anyway
return(IntPtr.Zero);
}
// Save the exception
var originalException = new PythonException();
// Otherwise, just clear the it.
Exceptions.Clear();
string[] names = realname.Split('.');
// See if sys.modules for this interpreter already has the
// requested module. If so, just return the existing module.
BorrowedReference modules = Runtime.PyImport_GetModuleDict();
BorrowedReference module = Runtime.PyDict_GetItem(modules, py_mod_name);
if (module != null)
{
if (fromlist)
{
if (IsLoadAll(fromList))
{
var mod = ManagedType.GetManagedObject(module) as ModuleObject;
mod?.LoadNames();
}
return(new NewReference(module).DangerousMoveToPointer());
}
module = Runtime.PyDict_GetItemString(modules, names[0]);
return(new NewReference(module, canBeNull: true).DangerousMoveToPointer());
}
Exceptions.Clear();
// Traverse the qualified module name to get the named module
// and place references in sys.modules as we go. Note that if
// we are running in interactive mode we pre-load the names in
// each module, which is often useful for introspection. If we
// are not interactive, we stick to just-in-time creation of
// objects at lookup time, which is much more efficient.
// NEW: The clr got a new module variable preload. You can
// enable preloading in a non-interactive python processing by
// setting clr.preload = True
ModuleObject head = mod_name == realname ? null : root;
ModuleObject tail = root;
root.InitializePreload();
foreach (string name in names)
{
ManagedType mt = tail.GetAttribute(name, true);
if (!(mt is ModuleObject))
{
originalException.Restore();
return(IntPtr.Zero);
}
if (head == null)
{
head = (ModuleObject)mt;
}
tail = (ModuleObject)mt;
if (CLRModule.preload)
{
tail.LoadNames();
}
// Add the module to sys.modules
Runtime.PyDict_SetItemString(modules, tail.moduleName, tail.ObjectReference);
}
{
var mod = fromlist ? tail : head;
if (fromlist && IsLoadAll(fromList))
{
mod.LoadNames();
}
Runtime.XIncref(mod.pyHandle);
return(mod.pyHandle);
}
}
//===================================================================
// The actual import hook that ties Python to the managed world.
//===================================================================
public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
{
// Replacement for the builtin __import__. The original import
// hook is saved as this.py_import. This version handles CLR
// import and defers to the normal builtin for everything else.
int num_args = Runtime.PyTuple_Size(args);
if (num_args < 1)
{
return(Exceptions.RaiseTypeError(
"__import__() takes at least 1 argument (0 given)"
));
}
// borrowed reference
IntPtr py_mod_name = Runtime.PyTuple_GetItem(args, 0);
if ((py_mod_name == IntPtr.Zero) ||
(!Runtime.IsStringType(py_mod_name)))
{
return(Exceptions.RaiseTypeError("string expected"));
}
// Check whether the import is of the form 'from x import y'.
// This determines whether we return the head or tail module.
IntPtr fromList = IntPtr.Zero;
bool fromlist = false;
if (num_args >= 4)
{
fromList = Runtime.PyTuple_GetItem(args, 3);
if ((fromList != IntPtr.Zero) &&
(Runtime.PyObject_IsTrue(fromList) == 1))
{
fromlist = true;
}
}
string mod_name = Runtime.GetManagedString(py_mod_name);
// Check these BEFORE the built-in import runs; may as well
// do the Incref()ed return here, since we've already found
// the module.
if (mod_name == "clr")
{
root.InitializePreload();
Runtime.Incref(root.pyHandle);
return(root.pyHandle);
}
if (mod_name == "CLR")
{
Exceptions.deprecation("The CLR module is deprecated. " +
"Please use 'clr'.");
root.InitializePreload();
Runtime.Incref(root.pyHandle);
return(root.pyHandle);
}
string realname = mod_name;
if (mod_name.StartsWith("CLR."))
{
realname = mod_name.Substring(4);
string msg = String.Format("Importing from the CLR.* namespace " +
"is deprecated. Please import '{0}' directly.", realname);
Exceptions.deprecation(msg);
}
else
{
// 2010-08-15: Always seemed smart to let python try first...
// This shaves off a few tenths of a second on test_module.py
// and works around a quirk where 'sys' is found by the
// LoadImplicit() deprecation logic.
// Turns out that the AssemblyManager.ResolveHandler() checks to see if any
// Assembly's FullName.ToLower().StartsWith(name.ToLower()), which makes very
// little sense to me.
IntPtr res = Runtime.PyObject_Call(py_import, args, kw);
if (res != IntPtr.Zero)
{
// There was no error.
return(res);
}
// There was an error
if (!Exceptions.ExceptionMatches(Exceptions.ImportError))
{
// and it was NOT an ImportError; bail out here.
return(IntPtr.Zero);
}
// Otherwise, just clear the it.
Exceptions.Clear();
}
string[] names = realname.Split('.');
// Now we need to decide if the name refers to a CLR module,
// and may have to do an implicit load (for b/w compatibility)
// using the AssemblyManager. The assembly manager tries
// really hard not to use Python objects or APIs, because
// parts of it can run recursively and on strange threads.
//
// It does need an opportunity from time to time to check to
// see if sys.path has changed, in a context that is safe. Here
// we know we have the GIL, so we'll let it update if needed.
AssemblyManager.UpdatePath();
if (!AssemblyManager.IsValidNamespace(realname))
{
bool fromFile = false;
if (AssemblyManager.LoadImplicit(realname, out fromFile))
{
if (true == fromFile)
{
string deprWarning = String.Format("\nThe module was found, but not in a referenced namespace.\n" +
"Implicit loading is deprecated. Please use clr.AddReference(\"{0}\").", realname);
Exceptions.deprecation(deprWarning);
}
}
else
{
// May be called when a module being imported imports a module.
// In particular, I've seen decimal import copy import org.python.core
return(Runtime.PyObject_Call(py_import, args, kw));
}
}
// See if sys.modules for this interpreter already has the
// requested module. If so, just return the exising module.
IntPtr modules = Runtime.PyImport_GetModuleDict();
IntPtr module = Runtime.PyDict_GetItem(modules, py_mod_name);
if (module != IntPtr.Zero)
{
if (fromlist)
{
Runtime.Incref(module);
return(module);
}
module = Runtime.PyDict_GetItemString(modules, names[0]);
Runtime.Incref(module);
return(module);
}
Exceptions.Clear();
// Traverse the qualified module name to get the named module
// and place references in sys.modules as we go. Note that if
// we are running in interactive mode we pre-load the names in
// each module, which is often useful for introspection. If we
// are not interactive, we stick to just-in-time creation of
// objects at lookup time, which is much more efficient.
// NEW: The clr got a new module variable preload. You can
// enable preloading in a non-interactive python processing by
// setting clr.preload = True
ModuleObject head = (mod_name == realname) ? null : root;
ModuleObject tail = root;
root.InitializePreload();
for (int i = 0; i < names.Length; i++)
{
string name = names[i];
ManagedType mt = tail.GetAttribute(name, true);
if (!(mt is ModuleObject))
{
string error = String.Format("No module named {0}", name);
Exceptions.SetError(Exceptions.ImportError, error);
return(IntPtr.Zero);
}
if (head == null)
{
head = (ModuleObject)mt;
}
tail = (ModuleObject)mt;
if (CLRModule.preload)
{
tail.LoadNames();
}
Runtime.PyDict_SetItemString(modules, tail.moduleName,
tail.pyHandle
);
}
ModuleObject mod = fromlist ? tail : head;
if (fromlist && Runtime.PySequence_Size(fromList) == 1)
{
IntPtr fp = Runtime.PySequence_GetItem(fromList, 0);
if ((!CLRModule.preload) && Runtime.GetManagedString(fp) == "*")
{
mod.LoadNames();
}
Runtime.Decref(fp);
}
Runtime.Incref(mod.pyHandle);
return(mod.pyHandle);
}
internal static IntPtr CreateSubType(IntPtr py_name, IntPtr py_base_type, IntPtr py_dict)
{
// Utility to create a subtype of a managed type with the ability for the
// a python subtype able to override the managed implementation
string name = Runtime.GetManagedString(py_name);
// the derived class can have class attributes __assembly__ and __module__ which
// control the name of the assembly and module the new type is created in.
object assembly = null;
object namespaceStr = null;
var disposeList = new List <PyObject>();
try
{
var assemblyKey = new PyObject(Converter.ToPython("__assembly__", typeof(string)));
disposeList.Add(assemblyKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, assemblyKey.Handle))
{
var pyAssembly = new PyObject(Runtime.PyDict_GetItem(py_dict, assemblyKey.Handle));
Runtime.XIncref(pyAssembly.Handle);
disposeList.Add(pyAssembly);
if (!Converter.ToManagedValue(pyAssembly.Handle, typeof(string), out assembly, false))
{
throw new InvalidCastException("Couldn't convert __assembly__ value to string");
}
}
var namespaceKey = new PyObject(Converter.ToPythonImplicit("__namespace__"));
disposeList.Add(namespaceKey);
if (0 != Runtime.PyMapping_HasKey(py_dict, namespaceKey.Handle))
{
var pyNamespace = new PyObject(Runtime.PyDict_GetItem(py_dict, namespaceKey.Handle));
Runtime.XIncref(pyNamespace.Handle);
disposeList.Add(pyNamespace);
if (!Converter.ToManagedValue(pyNamespace.Handle, typeof(string), out namespaceStr, false))
{
throw new InvalidCastException("Couldn't convert __namespace__ value to string");
}
}
}
finally
{
foreach (PyObject o in disposeList)
{
o.Dispose();
}
}
// create the new managed type subclassing the base managed type
var baseClass = ManagedType.GetManagedObject(py_base_type) as ClassBase;
if (null == baseClass)
{
return(Exceptions.RaiseTypeError("invalid base class, expected CLR class type"));
}
try
{
Type subType = ClassDerivedObject.CreateDerivedType(name,
baseClass.type,
py_dict,
(string)namespaceStr,
(string)assembly);
// create the new ManagedType and python type
ClassBase subClass = ClassManager.GetClass(subType);
IntPtr py_type = GetTypeHandle(subClass, subType);
// by default the class dict will have all the C# methods in it, but as this is a
// derived class we want the python overrides in there instead if they exist.
IntPtr cls_dict = Marshal.ReadIntPtr(py_type, TypeOffset.tp_dict);
Runtime.PyDict_Update(cls_dict, py_dict);
return(py_type);
}
catch (Exception e)
{
return(Exceptions.RaiseTypeError(e.Message));
}
}
/// <summary>
/// The actual import hook that ties Python to the managed world.
/// </summary>
public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
{
// Replacement for the builtin __import__. The original import
// hook is saved as this.py_import. This version handles CLR
// import and defers to the normal builtin for everything else.
var num_args = Runtime.PyTuple_Size(args);
if (num_args < 1)
{
return(Exceptions.RaiseTypeError("__import__() takes at least 1 argument (0 given)"));
}
// borrowed reference
IntPtr py_mod_name = Runtime.PyTuple_GetItem(args, 0);
if (py_mod_name == IntPtr.Zero ||
!Runtime.IsStringType(py_mod_name))
{
return(Exceptions.RaiseTypeError("string expected"));
}
// Check whether the import is of the form 'from x import y'.
// This determines whether we return the head or tail module.
IntPtr fromList = IntPtr.Zero;
var fromlist = false;
if (num_args >= 4)
{
fromList = Runtime.PyTuple_GetItem(args, 3);
if (fromList != IntPtr.Zero &&
Runtime.PyObject_IsTrue(fromList) == 1)
{
fromlist = true;
}
}
string mod_name = Runtime.GetManagedString(py_mod_name);
// Check these BEFORE the built-in import runs; may as well
// do the Incref()ed return here, since we've already found
// the module.
if (mod_name == "clr" || mod_name == "CLR")
{
if (mod_name == "CLR")
{
Exceptions.deprecation("The CLR module is deprecated. Please use 'clr'.");
}
IntPtr clr_module = GetCLRModule(fromList);
if (clr_module != IntPtr.Zero)
{
IntPtr sys_modules = Runtime.PyImport_GetModuleDict();
if (sys_modules != IntPtr.Zero)
{
Runtime.PyDict_SetItemString(sys_modules, "clr", clr_module);
}
}
return(clr_module);
}
string realname = mod_name;
string clr_prefix = null;
if (mod_name.StartsWith("CLR."))
{
clr_prefix = "CLR."; // prepend when adding the module to sys.modules
realname = mod_name.Substring(4);
string msg = $"Importing from the CLR.* namespace is deprecated. Please import '{realname}' directly.";
Exceptions.deprecation(msg);
}
else
{
// 2010-08-15: Always seemed smart to let python try first...
// This shaves off a few tenths of a second on test_module.py
// and works around a quirk where 'sys' is found by the
// LoadImplicit() deprecation logic.
// Turns out that the AssemblyManager.ResolveHandler() checks to see if any
// Assembly's FullName.ToLower().StartsWith(name.ToLower()), which makes very
// little sense to me.
IntPtr res = Runtime.PyObject_Call(py_import, args, kw);
if (res != IntPtr.Zero)
{
// There was no error.
if (fromlist && IsLoadAll(fromList))
{
var mod = ManagedType.GetManagedObject(res) as ModuleObject;
mod?.LoadNames();
}
return(res);
}
// There was an error
if (!Exceptions.ExceptionMatches(Exceptions.ImportError))
{
// and it was NOT an ImportError; bail out here.
return(IntPtr.Zero);
}
if (mod_name == string.Empty)
{
// Most likely a missing relative import.
// For example site-packages\bs4\builder\__init__.py uses it to check if a package exists:
// from . import _html5lib
// We don't support them anyway
return(IntPtr.Zero);
}
// Otherwise, just clear the it.
Exceptions.Clear();
}
string[] names = realname.Split('.');
// Now we need to decide if the name refers to a CLR module,
// and may have to do an implicit load (for b/w compatibility)
// using the AssemblyManager. The assembly manager tries
// really hard not to use Python objects or APIs, because
// parts of it can run recursively and on strange threads.
//
// It does need an opportunity from time to time to check to
// see if sys.path has changed, in a context that is safe. Here
// we know we have the GIL, so we'll let it update if needed.
AssemblyManager.UpdatePath();
if (!AssemblyManager.IsValidNamespace(realname))
{
var loadExceptions = new List <Exception>();
if (!AssemblyManager.LoadImplicit(realname, assemblyLoadErrorHandler: loadExceptions.Add))
{
// May be called when a module being imported imports a module.
// In particular, I've seen decimal import copy import org.python.core
IntPtr importResult = Runtime.PyObject_Call(py_import, args, kw);
// TODO: use ModuleNotFoundError in Python 3.6+
if (importResult == IntPtr.Zero && loadExceptions.Count > 0 &&
Exceptions.ExceptionMatches(Exceptions.ImportError))
{
loadExceptions.Add(new PythonException());
var importError = new PyObject(new BorrowedReference(Exceptions.ImportError));
importError.SetAttr("__cause__", new AggregateException(loadExceptions).ToPython());
Runtime.PyErr_SetObject(new BorrowedReference(Exceptions.ImportError), importError.Reference);
}
return(importResult);
}
}
// See if sys.modules for this interpreter already has the
// requested module. If so, just return the existing module.
IntPtr modules = Runtime.PyImport_GetModuleDict();
IntPtr module = Runtime.PyDict_GetItem(modules, py_mod_name);
if (module != IntPtr.Zero)
{
if (fromlist)
{
if (IsLoadAll(fromList))
{
var mod = ManagedType.GetManagedObject(module) as ModuleObject;
mod?.LoadNames();
}
Runtime.XIncref(module);
return(module);
}
if (clr_prefix != null)
{
return(GetCLRModule(fromList));
}
module = Runtime.PyDict_GetItemString(modules, names[0]);
Runtime.XIncref(module);
return(module);
}
Exceptions.Clear();
// Traverse the qualified module name to get the named module
// and place references in sys.modules as we go. Note that if
// we are running in interactive mode we pre-load the names in
// each module, which is often useful for introspection. If we
// are not interactive, we stick to just-in-time creation of
// objects at lookup time, which is much more efficient.
// NEW: The clr got a new module variable preload. You can
// enable preloading in a non-interactive python processing by
// setting clr.preload = True
ModuleObject head = mod_name == realname ? null : root;
ModuleObject tail = root;
root.InitializePreload();
foreach (string name in names)
{
ManagedType mt = tail.GetAttribute(name, true);
if (!(mt is ModuleObject))
{
Exceptions.SetError(Exceptions.ImportError, $"No module named {name}");
return(IntPtr.Zero);
}
if (head == null)
{
head = (ModuleObject)mt;
}
tail = (ModuleObject)mt;
if (CLRModule.preload)
{
tail.LoadNames();
}
// Add the module to sys.modules
Runtime.PyDict_SetItemString(modules, tail.moduleName, tail.pyHandle);
// If imported from CLR add CLR.<modulename> to sys.modules as well
if (clr_prefix != null)
{
Runtime.PyDict_SetItemString(modules, clr_prefix + tail.moduleName, tail.pyHandle);
}
}
{
var mod = fromlist ? tail : head;
if (fromlist && IsLoadAll(fromList))
{
mod.LoadNames();
}
Runtime.XIncref(mod.pyHandle);
return(mod.pyHandle);
}
}
/// <summary>
/// Metatype __new__ implementation. This is called to create a new
/// class / type when a reflected class is subclassed.
/// </summary>
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
{
var len = Runtime.PyTuple_Size(args);
if (len < 3)
{
return(Exceptions.RaiseTypeError("invalid argument list"));
}
IntPtr name = Runtime.PyTuple_GetItem(args, 0);
IntPtr bases = Runtime.PyTuple_GetItem(args, 1);
IntPtr dict = Runtime.PyTuple_GetItem(args, 2);
// We do not support multiple inheritance, so the bases argument
// should be a 1-item tuple containing the type we are subtyping.
// That type must itself have a managed implementation. We check
// that by making sure its metatype is the CLR metatype.
if (Runtime.PyTuple_Size(bases) != 1)
{
return(Exceptions.RaiseTypeError("cannot use multiple inheritance with managed classes"));
}
IntPtr base_type = Runtime.PyTuple_GetItem(bases, 0);
IntPtr mt = Runtime.PyObject_TYPE(base_type);
if (!(mt == PyCLRMetaType || mt == Runtime.PyTypeType))
{
return(Exceptions.RaiseTypeError("invalid metatype"));
}
// Ensure that the reflected type is appropriate for subclassing,
// disallowing subclassing of delegates, enums and array types.
var cb = GetManagedObject(base_type) as ClassBase;
if (cb != null)
{
if (!cb.CanSubclass())
{
return(Exceptions.RaiseTypeError("delegates, enums and array types cannot be subclassed"));
}
}
IntPtr slots = Runtime.PyDict_GetItem(dict, PyIdentifier.__slots__);
if (slots != IntPtr.Zero)
{
return(Exceptions.RaiseTypeError("subclasses of managed classes do not support __slots__"));
}
// If __assembly__ or __namespace__ are in the class dictionary then create
// a managed sub type.
// This creates a new managed type that can be used from .net to call back
// into python.
if (IntPtr.Zero != dict)
{
Runtime.XIncref(dict);
using (var clsDict = new PyDict(dict))
{
if (clsDict.HasKey("__assembly__") || clsDict.HasKey("__namespace__"))
{
return(TypeManager.CreateSubType(name, base_type, dict));
}
}
}
// otherwise just create a basic type without reflecting back into the managed side.
IntPtr func = Marshal.ReadIntPtr(Runtime.PyTypeType, TypeOffset.tp_new);
IntPtr type = NativeCall.Call_3(func, tp, args, kw);
if (type == IntPtr.Zero)
{
return(IntPtr.Zero);
}
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.BaseType;
flags |= TypeFlags.Subclass;
flags |= TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
TypeManager.CopySlot(base_type, type, TypeOffset.tp_dealloc);
// Hmm - the standard subtype_traverse, clear look at ob_size to
// do things, so to allow gc to work correctly we need to move
// our hidden handle out of ob_size. Then, in theory we can
// comment this out and still not crash.
TypeManager.CopySlot(base_type, type, TypeOffset.tp_traverse);
TypeManager.CopySlot(base_type, type, TypeOffset.tp_clear);
// for now, move up hidden handle...
IntPtr gc = Marshal.ReadIntPtr(base_type, TypeOffset.magic());
Marshal.WriteIntPtr(type, TypeOffset.magic(), gc);
return(type);
}
//===================================================================
// The actual import hook that ties Python to the managed world.
//===================================================================
public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
{
// Replacement for the builtin __import__. The original import
// hook is saved as this.py_import. This version handles CLR
// import and defers to the normal builtin for everything else.
int num_args = Runtime.PyTuple_Size(args);
if (num_args < 1)
{
return(Exceptions.RaiseTypeError(
"__import__() takes at least 1 argument (0 given)"
));
}
// borrowed reference
IntPtr py_mod_name = Runtime.PyTuple_GetItem(args, 0);
if ((py_mod_name == IntPtr.Zero) ||
(!Runtime.IsStringType(py_mod_name)))
{
return(Exceptions.RaiseTypeError("string expected"));
}
// Check whether the import is of the form 'from x import y'.
// This determines whether we return the head or tail module.
IntPtr fromList = IntPtr.Zero;
bool fromlist = false;
if (num_args >= 4)
{
fromList = Runtime.PyTuple_GetItem(args, 3);
if ((fromList != IntPtr.Zero) &&
(Runtime.PyObject_IsTrue(fromList) == 1))
{
fromlist = true;
}
}
string mod_name = Runtime.GetManagedString(py_mod_name);
if (mod_name == "CLR")
{
Exceptions.deprecation("The CLR module is deprecated. " +
"Please use 'clr'.");
root.InitializePreload();
Runtime.Incref(root.pyHandle);
return(root.pyHandle);
}
if (mod_name == "clr")
{
root.InitializePreload();
Runtime.Incref(root.pyHandle);
return(root.pyHandle);
}
string realname = mod_name;
if (mod_name.StartsWith("CLR."))
{
realname = mod_name.Substring(4);
string msg = String.Format("Importing from the CLR.* namespace " +
"is deprecated. Please import '{0}' directly.", realname);
Exceptions.deprecation(msg);
}
string[] names = realname.Split('.');
// Now we need to decide if the name refers to a CLR module,
// and may have to do an implicit load (for b/w compatibility)
// using the AssemblyManager. The assembly manager tries
// really hard not to use Python objects or APIs, because
// parts of it can run recursively and on strange threads.
//
// It does need an opportunity from time to time to check to
// see if sys.path has changed, in a context that is safe. Here
// we know we have the GIL, so we'll let it update if needed.
AssemblyManager.UpdatePath();
AssemblyManager.LoadImplicit(realname);
if (!AssemblyManager.IsValidNamespace(realname))
{
return(Runtime.PyObject_Call(py_import, args, kw));
}
// See if sys.modules for this interpreter already has the
// requested module. If so, just return the exising module.
IntPtr modules = Runtime.PyImport_GetModuleDict();
IntPtr module = Runtime.PyDict_GetItem(modules, py_mod_name);
if (module != IntPtr.Zero)
{
if (fromlist)
{
Runtime.Incref(module);
return(module);
}
module = Runtime.PyDict_GetItemString(modules, names[0]);
Runtime.Incref(module);
return(module);
}
Exceptions.Clear();
// Traverse the qualified module name to get the named module
// and place references in sys.modules as we go. Note that if
// we are running in interactive mode we pre-load the names in
// each module, which is often useful for introspection. If we
// are not interactive, we stick to just-in-time creation of
// objects at lookup time, which is much more efficient.
// NEW: The clr got a new module variable preload. You can
// enable preloading in a non-interactive python processing by
// setting clr.preload = True
ModuleObject head = (mod_name == realname) ? null : root;
ModuleObject tail = root;
root.InitializePreload();
for (int i = 0; i < names.Length; i++)
{
string name = names[i];
ManagedType mt = tail.GetAttribute(name, true);
if (!(mt is ModuleObject))
{
string error = String.Format("No module named {0}", name);
Exceptions.SetError(Exceptions.ImportError, error);
return(IntPtr.Zero);
}
if (head == null)
{
head = (ModuleObject)mt;
}
tail = (ModuleObject)mt;
if (CLRModule.preload)
{
tail.LoadNames();
}
Runtime.PyDict_SetItemString(modules, tail.moduleName,
tail.pyHandle
);
}
ModuleObject mod = fromlist ? tail : head;
if (fromlist && Runtime.PySequence_Size(fromList) == 1)
{
IntPtr fp = Runtime.PySequence_GetItem(fromList, 0);
if ((!CLRModule.preload) && Runtime.GetManagedString(fp) == "*")
{
mod.LoadNames();
}
Runtime.Decref(fp);
}
Runtime.Incref(mod.pyHandle);
return(mod.pyHandle);
}
