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244 lines
10 KiB
C#
244 lines
10 KiB
C#
// ==========================================================================
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// This software is subject to the provisions of the Zope Public License,
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// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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// FOR A PARTICULAR PURPOSE.
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// ==========================================================================
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using System;
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using System.Collections;
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using System.Runtime.InteropServices;
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namespace Python.Runtime {
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//========================================================================
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// Implements the "import hook" used to integrate Python with the CLR.
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//========================================================================
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internal class ImportHook {
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static IntPtr py_import;
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static CLRModule root;
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static MethodWrapper hook;
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//===================================================================
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// Initialization performed on startup of the Python runtime.
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//===================================================================
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internal static void Initialize() {
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// Initialize the Python <--> CLR module hook. We replace the
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// built-in Python __import__ with our own. This isn't ideal,
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// but it provides the most "Pythonic" way of dealing with CLR
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// modules (Python doesn't provide a way to emulate packages).
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IntPtr dict = Runtime.PyImport_GetModuleDict();
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IntPtr mod = Runtime.PyDict_GetItemString(dict, "__builtin__");
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py_import = Runtime.PyObject_GetAttrString(mod, "__import__");
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hook = new MethodWrapper(typeof(ImportHook), "__import__");
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Runtime.PyObject_SetAttrString(mod, "__import__", hook.ptr);
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Runtime.Decref(hook.ptr);
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root = new CLRModule();
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Runtime.Incref(root.pyHandle); // we are using the module two times
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Runtime.PyDict_SetItemString(dict, "CLR", root.pyHandle);
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Runtime.PyDict_SetItemString(dict, "clr", root.pyHandle);
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}
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//===================================================================
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// Cleanup resources upon shutdown of the Python runtime.
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//===================================================================
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internal static void Shutdown() {
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Runtime.Decref(root.pyHandle);
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Runtime.Decref(root.pyHandle);
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Runtime.Decref(py_import);
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}
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//===================================================================
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// The actual import hook that ties Python to the managed world.
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//===================================================================
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public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw) {
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// Replacement for the builtin __import__. The original import
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// hook is saved as this.py_import. This version handles CLR
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// import and defers to the normal builtin for everything else.
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int num_args = Runtime.PyTuple_Size(args);
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if (num_args < 1) {
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return Exceptions.RaiseTypeError(
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"__import__() takes at least 1 argument (0 given)"
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);
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}
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// borrowed reference
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IntPtr py_mod_name = Runtime.PyTuple_GetItem(args, 0);
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if ((py_mod_name == IntPtr.Zero) ||
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(!Runtime.IsStringType(py_mod_name))) {
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return Exceptions.RaiseTypeError("string expected");
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}
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// Check whether the import is of the form 'from x import y'.
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// This determines whether we return the head or tail module.
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IntPtr fromList = IntPtr.Zero;
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bool fromlist = false;
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if (num_args >= 4) {
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fromList = Runtime.PyTuple_GetItem(args, 3);
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if ((fromList != IntPtr.Zero) &&
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(Runtime.PyObject_IsTrue(fromList) == 1)) {
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fromlist = true;
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}
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}
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string mod_name = Runtime.GetManagedString(py_mod_name);
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// Check these BEFORE the built-in import runs; may as well
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// do the Incref()ed return here, since we've already found
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// the module.
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if (mod_name == "clr") {
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root.InitializePreload();
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Runtime.Incref(root.pyHandle);
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return root.pyHandle;
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}
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if (mod_name == "CLR") {
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Exceptions.deprecation("The CLR module is deprecated. " +
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"Please use 'clr'.");
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root.InitializePreload();
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Runtime.Incref(root.pyHandle);
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return root.pyHandle;
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}
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string realname = mod_name;
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if (mod_name.StartsWith("CLR.")) {
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realname = mod_name.Substring(4);
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string msg = String.Format("Importing from the CLR.* namespace "+
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"is deprecated. Please import '{0}' directly.", realname);
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Exceptions.deprecation(msg);
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}
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else {
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// 2010-08-15: Always seemed smart to let python try first...
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// This shaves off a few tenths of a second on test_module.py
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// and works around a quirk where 'sys' is found by the
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// LoadImplicit() deprecation logic.
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// Turns out that the AssemblyManager.ResolveHandler() checks to see if any
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// Assembly's FullName.ToLower().StartsWith(name.ToLower()), which makes very
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// little sense to me.
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IntPtr res = Runtime.PyObject_Call(py_import, args, kw);
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if (res != IntPtr.Zero) {
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// There was no error.
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return res;
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}
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// There was an error
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if (!Exceptions.ExceptionMatches(Exceptions.ImportError)) {
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// and it was NOT an ImportError; bail out here.
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return IntPtr.Zero;
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}
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// Otherwise, just clear the it.
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Exceptions.Clear();
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}
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string[] names = realname.Split('.');
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// Now we need to decide if the name refers to a CLR module,
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// and may have to do an implicit load (for b/w compatibility)
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// using the AssemblyManager. The assembly manager tries
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// really hard not to use Python objects or APIs, because
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// parts of it can run recursively and on strange threads.
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//
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// It does need an opportunity from time to time to check to
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// see if sys.path has changed, in a context that is safe. Here
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// we know we have the GIL, so we'll let it update if needed.
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AssemblyManager.UpdatePath();
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if (!AssemblyManager.IsValidNamespace(realname)) {
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bool fromFile = false;
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if (AssemblyManager.LoadImplicit(realname, out fromFile)) {
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if (true == fromFile) {
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string deprWarning = String.Format("\nThe module was found, but not in a referenced namespace.\n" +
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"Implicit loading is deprecated. Please use clr.AddReference(\"{0}\").", realname);
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Exceptions.deprecation(deprWarning);
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}
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}
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else
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{
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// May be called when a module being imported imports a module.
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// In particular, I've seen decimal import copy import org.python.core
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return Runtime.PyObject_Call(py_import, args, kw);
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}
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}
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// See if sys.modules for this interpreter already has the
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// requested module. If so, just return the exising module.
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IntPtr modules = Runtime.PyImport_GetModuleDict();
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IntPtr module = Runtime.PyDict_GetItem(modules, py_mod_name);
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if (module != IntPtr.Zero) {
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if (fromlist) {
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Runtime.Incref(module);
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return module;
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}
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module = Runtime.PyDict_GetItemString(modules, names[0]);
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Runtime.Incref(module);
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return module;
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}
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Exceptions.Clear();
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// Traverse the qualified module name to get the named module
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// and place references in sys.modules as we go. Note that if
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// we are running in interactive mode we pre-load the names in
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// each module, which is often useful for introspection. If we
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// are not interactive, we stick to just-in-time creation of
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// objects at lookup time, which is much more efficient.
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// NEW: The clr got a new module variable preload. You can
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// enable preloading in a non-interactive python processing by
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// setting clr.preload = True
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ModuleObject head = (mod_name == realname) ? null : root;
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ModuleObject tail = root;
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root.InitializePreload();
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for (int i = 0; i < names.Length; i++) {
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string name = names[i];
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ManagedType mt = tail.GetAttribute(name, true);
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if (!(mt is ModuleObject)) {
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string error = String.Format("No module named {0}", name);
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Exceptions.SetError(Exceptions.ImportError, error);
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return IntPtr.Zero;
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}
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if (head == null) {
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head = (ModuleObject)mt;
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}
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tail = (ModuleObject) mt;
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if (CLRModule.preload) {
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tail.LoadNames();
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}
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Runtime.PyDict_SetItemString(modules, tail.moduleName,
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tail.pyHandle
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);
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}
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ModuleObject mod = fromlist ? tail : head;
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if (fromlist && Runtime.PySequence_Size(fromList) == 1) {
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IntPtr fp = Runtime.PySequence_GetItem(fromList, 0);
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if ((!CLRModule.preload) && Runtime.GetManagedString(fp) == "*") {
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mod.LoadNames();
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}
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Runtime.Decref(fp);
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}
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Runtime.Incref(mod.pyHandle);
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return mod.pyHandle;
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}
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}
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}
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