mirror of
https://github.com/microsoft/PowerToys.git
synced 2024-12-15 20:19:17 +08:00
244 lines
10 KiB
C#
244 lines
10 KiB
C#
// ==========================================================================
|
|
// This software is subject to the provisions of the Zope Public License,
|
|
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
|
|
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
|
|
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
|
|
// FOR A PARTICULAR PURPOSE.
|
|
// ==========================================================================
|
|
|
|
using System;
|
|
using System.Collections;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace Python.Runtime {
|
|
|
|
//========================================================================
|
|
// Implements the "import hook" used to integrate Python with the CLR.
|
|
//========================================================================
|
|
|
|
internal class ImportHook {
|
|
|
|
static IntPtr py_import;
|
|
static CLRModule root;
|
|
static MethodWrapper hook;
|
|
|
|
//===================================================================
|
|
// Initialization performed on startup of the Python runtime.
|
|
//===================================================================
|
|
|
|
internal static void Initialize() {
|
|
|
|
// Initialize the Python <--> CLR module hook. We replace the
|
|
// built-in Python __import__ with our own. This isn't ideal,
|
|
// but it provides the most "Pythonic" way of dealing with CLR
|
|
// modules (Python doesn't provide a way to emulate packages).
|
|
|
|
IntPtr dict = Runtime.PyImport_GetModuleDict();
|
|
IntPtr mod = Runtime.PyDict_GetItemString(dict, "__builtin__");
|
|
py_import = Runtime.PyObject_GetAttrString(mod, "__import__");
|
|
|
|
hook = new MethodWrapper(typeof(ImportHook), "__import__");
|
|
Runtime.PyObject_SetAttrString(mod, "__import__", hook.ptr);
|
|
Runtime.Decref(hook.ptr);
|
|
|
|
root = new CLRModule();
|
|
Runtime.Incref(root.pyHandle); // we are using the module two times
|
|
Runtime.PyDict_SetItemString(dict, "CLR", root.pyHandle);
|
|
Runtime.PyDict_SetItemString(dict, "clr", root.pyHandle);
|
|
}
|
|
|
|
|
|
//===================================================================
|
|
// Cleanup resources upon shutdown of the Python runtime.
|
|
//===================================================================
|
|
|
|
internal static void Shutdown() {
|
|
Runtime.Decref(root.pyHandle);
|
|
Runtime.Decref(root.pyHandle);
|
|
Runtime.Decref(py_import);
|
|
}
|
|
|
|
|
|
//===================================================================
|
|
// 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;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
}
|