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using System;
using System.Collections.Specialized;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Collections;
using System.Reflection;
namespace Python.Runtime
{
//========================================================================
// 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
{
Dictionary<string, ManagedType> cache;
internal string moduleName;
internal IntPtr dict;
protected string _namespace;
public ModuleObject(string name) : base()
{
if (name == String.Empty)
{
throw new ArgumentException("Name must not be empty!");
}
moduleName = name;
cache = new Dictionary<string, ManagedType>();
_namespace = name;
// Use the filename from any of the assemblies just so there's something for
// anything that expects __file__ to be set.
string filename = "unknown";
string docstring = "Namespace containing types from the following assemblies:\n\n";
foreach (Assembly a in AssemblyManager.GetAssemblies(name))
{
filename = a.Location;
docstring += "- " + a.FullName + "\n";
}
dict = Runtime.PyDict_New();
IntPtr pyname = Runtime.PyString_FromString(moduleName);
IntPtr pyfilename = Runtime.PyString_FromString(filename);
IntPtr pydocstring = Runtime.PyString_FromString(docstring);
IntPtr pycls = TypeManager.GetTypeHandle(this.GetType());
Runtime.PyDict_SetItemString(dict, "__name__", pyname);
Runtime.PyDict_SetItemString(dict, "__file__", pyfilename);
Runtime.PyDict_SetItemString(dict, "__doc__", pydocstring);
Runtime.PyDict_SetItemString(dict, "__class__", pycls);
Runtime.Decref(pyname);
Runtime.Decref(pyfilename);
Runtime.Decref(pydocstring);
Marshal.WriteIntPtr(this.pyHandle, ObjectOffset.DictOffset(this.pyHandle), dict);
InitializeModuleMembers();
}
//===================================================================
// 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, bool guess)
{
ManagedType cached = null;
this.cache.TryGetValue(name, out cached);
if (cached != null)
{
return cached;
}
ModuleObject m;
ClassBase c;
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))
{
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 = 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.
bool ignore = name.StartsWith("__");
if (AssemblyManager.LoadImplicit(qname, !ignore))
{
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;
}
}
// 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(
_namespace, name);
if (gname != null)
{
ManagedType o = GetAttribute(gname, false);
if (o != null)
{
StoreAttribute(name, o);
return o;
}
}
}
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()
{
ManagedType m = null;
foreach (string name in AssemblyManager.GetNames(_namespace))
{
this.cache.TryGetValue(name, out m);
if (m == null)
{
ManagedType attr = this.GetAttribute(name, true);
if (Runtime.wrap_exceptions)
{
if (attr is ExceptionClassObject)
{
ExceptionClassObject c = attr as ExceptionClassObject;
if (c != null)
{
IntPtr p = attr.pyHandle;
IntPtr r = Exceptions.GetExceptionClassWrapper(p);
Runtime.PyDict_SetItemString(dict, name, r);
Runtime.Incref(r);
}
}
}
}
}
}
/// <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 = this.GetType();
BindingFlags flags = BindingFlags.Public | BindingFlags.Static;
while (type != null)
{
MethodInfo[] methods = type.GetMethods(flags);
for (int i = 0; i < methods.Length; i++)
{
MethodInfo method = methods[i];
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;
MethodInfo[] mi = new MethodInfo[1];
mi[0] = method;
ModuleFunctionObject m = new ModuleFunctionObject(type, name, mi, allow_threads);
StoreAttribute(name, m);
}
}
PropertyInfo[] properties = type.GetProperties();
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo property = properties[i];
object[] attrs = property.GetCustomAttributes(propmarker, false);
if (attrs.Length > 0)
{
string name = property.Name;
ModulePropertyObject p = new ModulePropertyObject(property);
StoreAttribute(name, p);
}
}
type = type.BaseType;
}
}
//====================================================================
// 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.
//====================================================================
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, true);
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 ExceptionClassObject)
{
ExceptionClassObject c = attr as ExceptionClassObject;
if (c != null)
{
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.
//====================================================================
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);
}
}
/// <summary>
/// The CLR module is the root handler used by the magic import hook
/// to import assemblies. It has a fixed module name "clr" and doesn't
/// provide a namespace.
/// </summary>
internal class CLRModule : ModuleObject
{
protected static bool hacked = false;
protected static bool interactive_preload = true;
internal static bool preload;
// XXX Test performance of new features //
internal static bool _SuppressDocs = false;
internal static bool _SuppressOverloads = false;
public CLRModule() : base("clr")
{
_namespace = String.Empty;
// 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;
}
}
/// <summary>
/// The initializing of the preload hook has to happen as late as
/// possible since sys.ps1 is created after the CLR module is
/// created.
/// </summary>
internal void InitializePreload()
{
if (interactive_preload)
{
interactive_preload = false;
if (Runtime.PySys_GetObject("ps1") != IntPtr.Zero)
{
preload = true;
}
else
{
Exceptions.Clear();
preload = false;
}
}
}
[ModuleFunctionAttribute()]
public static bool getPreload()
{
return preload;
}
[ModuleFunctionAttribute()]
public static void setPreload(bool preloadFlag)
{
preload = preloadFlag;
}
//[ModulePropertyAttribute]
public static bool SuppressDocs
{
get { return _SuppressDocs; }
set { _SuppressDocs = value; }
}
//[ModulePropertyAttribute]
public static bool SuppressOverloads
{
get { return _SuppressOverloads; }
set { _SuppressOverloads = value; }
}
[ModuleFunctionAttribute()]
[ForbidPythonThreadsAttribute()]
public static Assembly AddReference(string name)
{
AssemblyManager.UpdatePath();
Assembly assembly = null;
assembly = AssemblyManager.FindLoadedAssembly(name);
if (assembly == null)
{
assembly = AssemblyManager.LoadAssemblyPath(name);
}
if (assembly == null)
{
assembly = AssemblyManager.LoadAssembly(name);
}
if (assembly == null)
{
assembly = AssemblyManager.LoadAssemblyFullPath(name);
}
if (assembly == null)
{
string msg = String.Format("Unable to find assembly '{0}'.", name);
throw new System.IO.FileNotFoundException(msg);
}
return assembly;
}
[ModuleFunctionAttribute()]
[ForbidPythonThreadsAttribute()]
public static string FindAssembly(string name)
{
AssemblyManager.UpdatePath();
return AssemblyManager.FindAssembly(name);
}
[ModuleFunctionAttribute()]
public static String[] ListAssemblies(bool verbose)
{
AssemblyName[] assnames = AssemblyManager.ListAssemblies();
String[] names = new String[assnames.Length];
for (int i = 0; i < assnames.Length; i++)
{
if (verbose)
names[i] = assnames[i].FullName;
else
names[i] = assnames[i].Name;
}
return names;
}
[ModuleFunctionAttribute()]
public static int _AtExit()
{
return Runtime.AtExit();
}
}
}