Issue #1559549: Add 'name' and 'path' attributes to ImportError.

Currently import does not use these attributes as they are planned
for use by importlib (which will be another commit).

Thanks to Filip Gruszczyński for the initial patch and Brian Curtin
for refining it.

6 files changed, 192 insertions, 3 deletions

diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst
index 8c5a960..33bc3b0 100644
--- a/Doc/library/exceptions.rst
+++ b/Doc/library/exceptions.rst
@@ -159,6 +159,14 @@ The following exceptions are the exceptions that are usually raised.
    Raised when an :keyword:`import` statement fails to find the module definition
    or when a ``from ... import`` fails to find a name that is to be imported.
 
+   The :attr:`name` and :attr:`path` attributes can be set using keyword-only
+   arguments to the constructor. When set they represent the name of the module
+   that was attempted to be imported and the path to any file which triggered
+   the exception, respectively.
+
+   .. versionchanged:: 3.3
+      Added the :attr:`name` and :attr:`path` attributes.
+
 
 .. exception:: IndexError
 
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index 1e42ebb..a550705 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -231,6 +231,13 @@ PyAPI_FUNC(PyObject *) PyErr_Format(
     ...
     );
 
+typedef struct {
+    PyException_HEAD
+    PyObject *msg;
+    PyObject *name;
+    PyObject *path;
+} PyImportErrorObject;
+
 #ifdef MS_WINDOWS
 PyAPI_FUNC(PyObject *) PyErr_SetFromWindowsErrWithFilename(
     int ierr,
@@ -256,6 +263,12 @@ PyAPI_FUNC(PyObject *) PyErr_SetExcFromWindowsErrWithUnicodeFilename(
 PyAPI_FUNC(PyObject *) PyErr_SetExcFromWindowsErr(PyObject *, int);
 #endif /* MS_WINDOWS */
 
+PyAPI_FUNC(PyObject *) PyErr_SetExcWithArgsKwargs(PyObject *, PyObject *,
+    PyObject *);
+PyAPI_FUNC(PyObject *) PyErr_SetFromImportErrorWithNameAndPath(PyObject *,
+        PyObject *, PyObject *);
+PyAPI_FUNC(PyObject *) PyErr_SetFromImportErrorWithName(PyObject *, PyObject *);
+
 /* Export the old function so that the existing API remains available: */
 PyAPI_FUNC(void) PyErr_BadInternalCall(void);
 PyAPI_FUNC(void) _PyErr_BadInternalCall(const char *filename, int lineno);
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 42536d3..39ff85f 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -902,8 +902,30 @@ class ExceptionTests(unittest.TestCase):
         self.assertEqual(cm.exception.errno, errno.ENOTDIR, cm.exception)
 
 
+class ImportErrorTests(unittest.TestCase):
+
+    def test_attributes(self):
+        # Setting 'name' and 'path' should not be a problem.
+        exc = ImportError('test')
+        self.assertIsNone(exc.name)
+        self.assertIsNone(exc.path)
+
+        exc = ImportError('test', name='somemodule')
+        self.assertEqual(exc.name, 'somemodule')
+        self.assertIsNone(exc.path)
+
+        exc = ImportError('test', path='somepath')
+        self.assertEqual(exc.path, 'somepath')
+        self.assertIsNone(exc.name)
+
+        exc = ImportError('test', path='somepath', name='somename')
+        self.assertEqual(exc.name, 'somename')
+        self.assertEqual(exc.path, 'somepath')
+
+
+
 def test_main():
-    run_unittest(ExceptionTests)
+    run_unittest(ExceptionTests, ImportErrorTests)
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/Misc/NEWS b/Misc/NEWS
index c899f12..3dab768e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@ What's New in Python 3.3.0 Alpha 3?
 Core and Builtins
 -----------------
 
+- Issue #1559549: ImportError now has 'name' and 'path' attributes that are set
+  using keyword arguments to its constructor. They are currently not set by
+  import as they are meant for use by importlib.
+
 - Issue #14474: Save and restore exception state in thread.start_new_thread()
   while writing error message if the thread leaves a unhandled exception.
 
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index bc43799..f3dde11 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -605,9 +605,104 @@ SimpleExtendsException(PyExc_BaseException, KeyboardInterrupt,
 /*
  *    ImportError extends Exception
  */
-SimpleExtendsException(PyExc_Exception, ImportError,
-          "Import can't find module, or can't find name in module.");
 
+static int
+ImportError_init(PyImportErrorObject *self, PyObject *args, PyObject *kwds)
+{
+    PyObject *msg = NULL;
+    PyObject *name = NULL;
+    PyObject *path = NULL;
+
+/* Macro replacement doesn't allow ## to start the first line of a macro,
+   so we move the assignment and NULL check into the if-statement. */
+#define GET_KWD(kwd) { \
+    kwd = PyDict_GetItemString(kwds, #kwd); \
+    if (kwd) { \
+        Py_CLEAR(self->kwd); \
+        self->kwd = kwd;   \
+        Py_INCREF(self->kwd);\
+        if (PyDict_DelItemString(kwds, #kwd)) \
+            return -1; \
+    } \
+    }
+
+    if (kwds) {
+        GET_KWD(name);
+        GET_KWD(path);
+    }
+
+    if (BaseException_init((PyBaseExceptionObject *)self, args, kwds) == -1)
+        return -1;
+    if (PyTuple_GET_SIZE(args) != 1)
+        return 0;
+    if (!PyArg_UnpackTuple(args, "ImportError", 1, 1, &msg))
+        return -1;
+
+    Py_CLEAR(self->msg);          /* replacing */
+    self->msg = msg;
+    Py_INCREF(self->msg);
+
+    return 0;
+}
+
+static int
+ImportError_clear(PyImportErrorObject *self)
+{
+    Py_CLEAR(self->msg);
+    Py_CLEAR(self->name);
+    Py_CLEAR(self->path);
+    return BaseException_clear((PyBaseExceptionObject *)self);
+}
+
+static void
+ImportError_dealloc(PyImportErrorObject *self)
+{
+    _PyObject_GC_UNTRACK(self);
+    ImportError_clear(self);
+    Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static int
+ImportError_traverse(PyImportErrorObject *self, visitproc visit, void *arg)
+{
+    Py_VISIT(self->msg);
+    Py_VISIT(self->name);
+    Py_VISIT(self->path);
+    return BaseException_traverse((PyBaseExceptionObject *)self, visit, arg);
+}
+
+static PyObject *
+ImportError_str(PyImportErrorObject *self)
+{
+    if (self->msg) {
+        Py_INCREF(self->msg);
+        return self->msg;
+    }
+    else {
+        return BaseException_str((PyBaseExceptionObject *)self);
+    }
+}
+
+static PyMemberDef ImportError_members[] = {
+    {"msg", T_OBJECT, offsetof(PyImportErrorObject, msg), 0,
+        PyDoc_STR("exception message")},
+    {"name", T_OBJECT, offsetof(PyImportErrorObject, name), 0,
+        PyDoc_STR("module name")},
+    {"path", T_OBJECT, offsetof(PyImportErrorObject, path), 0,
+        PyDoc_STR("module path")},
+    {NULL}  /* Sentinel */
+};
+
+static PyMethodDef ImportError_methods[] = {
+    {NULL}
+};
+
+ComplexExtendsException(PyExc_Exception, ImportError,
+                        ImportError, 0 /* new */,
+                        ImportError_methods, ImportError_members,
+                        0 /* getset */, ImportError_str,
+                        "Import can't find module, or can't find name in "
+                        "module.");
 
 /*
  *    OSError extends Exception
diff --git a/Python/errors.c b/Python/errors.c
index 31fa9e2..345a345 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -585,6 +585,53 @@ PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(
 }
 #endif /* MS_WINDOWS */
 
+PyObject *
+PyErr_SetExcWithArgsKwargs(PyObject *exc, PyObject *args, PyObject *kwargs)
+{
+    PyObject *val;
+
+    /* args must at least be an empty tuple */
+    if (args == NULL)
+        args = PyTuple_New(0);
+
+    val = PyObject_Call(exc, args, kwargs);
+    if (val != NULL) {
+        PyErr_SetObject((PyObject *) Py_TYPE(val), val);
+        Py_DECREF(val);
+    }
+
+    return NULL;
+}
+
+PyObject *
+PyErr_SetFromImportErrorWithNameAndPath(PyObject *msg,
+                                        PyObject *name, PyObject *path)
+{
+    PyObject *args = PyTuple_New(1);
+    PyObject *kwargs = PyDict_New();
+    PyObject *result;
+
+    if (path == NULL)
+        path = Py_None;
+
+    PyTuple_SetItem(args, 0, msg);
+    PyDict_SetItemString(kwargs, "name", name);
+    PyDict_SetItemString(kwargs, "path", path);
+
+    result = PyErr_SetExcWithArgsKwargs(PyExc_ImportError, args, kwargs);
+
+    Py_DECREF(args);
+    Py_DECREF(kwargs);
+
+    return result;
+}
+
+PyObject *
+PyErr_SetFromImportErrorWithName(PyObject *msg, PyObject *name)
+{
+    return PyErr_SetFromImportErrorWithNameAndPath(msg, name, NULL);
+}
+
 void
 _PyErr_BadInternalCall(const char *filename, int lineno)
 {