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Copy pathmoduleobject.cs
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executable file
·248 lines (199 loc) · 7.85 KB
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// ==========================================================================
// 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.Runtime.InteropServices;
using System.Collections.Specialized;
using System.Collections;
using System.Reflection;
namespace Python.Runtime {
// TODO: decide whether to support __all__ and / or whether to impl
// a 'preload' method to force names to be pre-loaded.
//========================================================================
// Implements a Python type that provides access to CLR namespaces. The
// type behaves like a Python module, and can contain other sub-modules.
//========================================================================
internal class ModuleObject : ExtensionType {
internal string moduleName;
string _namespace;
Hashtable cache;
static bool hacked;
IntPtr dict;
public ModuleObject(string name) : base() {
moduleName = (name == String.Empty) ? "CLR" : name;
cache = new Hashtable();
_namespace = name;
dict = Runtime.PyDict_New();
IntPtr pyname = Runtime.PyString_FromString(moduleName);
Runtime.PyDict_SetItemString(dict, "__name__", pyname);
Runtime.PyDict_SetItemString(dict, "__file__", Runtime.PyNone);
Runtime.PyDict_SetItemString(dict, "__doc__", Runtime.PyNone);
Runtime.Decref(pyname);
Marshal.WriteIntPtr(this.pyHandle, ObjectOffset.ob_dict, dict);
// This hackery is required in order to allow a plain Python to
// import the managed runtime via the CLR bootstrapper module.
// The standard Python machinery in control at the time of the
// import requires the module to pass PyModule_Check. :(
if (!hacked) {
IntPtr type = this.tpHandle;
IntPtr mro = Marshal.ReadIntPtr(type, TypeOffset.tp_mro);
IntPtr ext = Runtime.ExtendTuple(mro, Runtime.PyModuleType);
Marshal.WriteIntPtr(type, TypeOffset.tp_mro, ext);
Runtime.Decref(mro);
hacked = true;
}
}
public string ModuleName {
get {
return moduleName;
}
}
//===================================================================
// 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.
//===================================================================
public ManagedType GetAttribute(string name) {
Object ob = this.cache[name];
if (ob != null) {
return (ManagedType) ob;
}
string qname = (_namespace == String.Empty) ? name :
_namespace + "." + name;
ModuleObject m;
ClassBase c;
// 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)) {
m = new ModuleObject(qname);
StoreAttribute(name, m);
return (ManagedType) 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 type = AssemblyManager.LookupType(qname);
if (type != null) {
if (!type.IsPublic) {
return null;
}
c = ClassManager.GetClass(type);
StoreAttribute(name, c);
return (ManagedType) c;
}
// This is a little repetitive, but it ensures that the right
// thing happens with implicit assembly loading at a reasonable
// cost. Ask the AssemblyManager to do implicit loading for each
// of the steps in the qualified name, then try it again.
if (AssemblyManager.LoadImplicit(qname)) {
if (AssemblyManager.IsValidNamespace(qname)) {
m = new ModuleObject(qname);
StoreAttribute(name, m);
return (ManagedType) m;
}
type = AssemblyManager.LookupType(qname);
if (type != null) {
if (!type.IsPublic) {
return null;
}
c = ClassManager.GetClass(type);
StoreAttribute(name, c);
return (ManagedType) c;
}
}
return null;
}
//===================================================================
// Stores an attribute in the instance dict for future lookups.
//===================================================================
private void StoreAttribute(string name, ManagedType ob) {
Runtime.PyDict_SetItemString(dict, name, ob.pyHandle);
cache[name] = ob;
}
//===================================================================
// 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.
//===================================================================
public void LoadNames() {
foreach (string name in AssemblyManager.GetNames(_namespace)) {
if (!this.cache.ContainsKey(name)) {
ManagedType attr = this.GetAttribute(name);
if (Runtime.wrap_exceptions) {
if (attr is ClassBase) {
ClassBase c = attr as ClassBase;
if (c.is_exception) {
IntPtr p = attr.pyHandle;
IntPtr r = Exceptions.GetExceptionClassWrapper(p);
Runtime.PyDict_SetItemString(dict, name, r);
Runtime.Incref(r);
}
}
}
}
}
}
//====================================================================
// 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.
//====================================================================
[CallConvCdecl()]
public static IntPtr tp_getattro(IntPtr ob, IntPtr key) {
ModuleObject 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.Incref(op);
return op;
}
string name = Runtime.GetManagedString(key);
if (name == "__dict__") {
Runtime.Incref(self.dict);
return self.dict;
}
ManagedType attr = self.GetAttribute(name);
if (attr == null) {
Exceptions.SetError(Exceptions.AttributeError, name);
return IntPtr.Zero;
}
// XXX - hack required to recognize exception types. These types
// may need to be wrapped in old-style class wrappers in versions
// of Python where new-style classes cannot be used as exceptions.
if (Runtime.wrap_exceptions) {
if (attr is ClassBase) {
ClassBase c = attr as ClassBase;
if (c.is_exception) {
IntPtr p = attr.pyHandle;
IntPtr r = Exceptions.GetExceptionClassWrapper(p);
Runtime.PyDict_SetItemString(self.dict, name, r);
Runtime.Incref(r);
return r;
}
}
}
Runtime.Incref(attr.pyHandle);
return attr.pyHandle;
}
//====================================================================
// ModuleObject __repr__ implementation.
//====================================================================
[CallConvCdecl()]
public static IntPtr tp_repr(IntPtr ob) {
ModuleObject self = (ModuleObject)GetManagedObject(ob);
string s = String.Format("<module '{0}'>", self.moduleName);
return Runtime.PyString_FromString(s);
}
}
}