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Sanitize and modernize some of the _elementtree code (see issue #16089).

This commit is contained in:
Antoine Pitrou 2012-10-01 23:41:51 +02:00
parent 4993cc0a5b c194884983
commit 5f62aaaa9e
1 changed files with 59 additions and 107 deletions
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166
Modules/_elementtree.c
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@ -123,17 +123,11 @@ deepcopy(PyObject* object, PyObject* memo)
return NULL;
}
args = PyTuple_New(2);
args = PyTuple_Pack(2, object, memo);
if (!args)
return NULL;
Py_INCREF(object); PyTuple_SET_ITEM(args, 0, (PyObject*) object);
Py_INCREF(memo); PyTuple_SET_ITEM(args, 1, (PyObject*) memo);
result = PyObject_CallObject(elementtree_deepcopy_obj, args);
Py_DECREF(args);
return result;
}
@ -141,48 +135,16 @@ LOCAL(PyObject*)
list_join(PyObject* list)
{
/* join list elements (destroying the list in the process) */
PyObject* joiner;
PyObject* function;
PyObject* args;
PyObject* result;
switch (PyList_GET_SIZE(list)) {
case 0:
Py_DECREF(list);
return PyBytes_FromString("");
case 1:
result = PyList_GET_ITEM(list, 0);
Py_INCREF(result);
Py_DECREF(list);
return result;
}
/* two or more elements: slice out a suitable separator from the
first member, and use that to join the entire list */
joiner = PySequence_GetSlice(PyList_GET_ITEM(list, 0), 0, 0);
joiner = PyUnicode_FromStringAndSize("", 0);
if (!joiner)
return NULL;
function = PyObject_GetAttrString(joiner, "join");
if (!function) {
Py_DECREF(joiner);
return NULL;
}
args = PyTuple_New(1);
if (!args)
return NULL;
PyTuple_SET_ITEM(args, 0, list);
result = PyObject_CallObject(function, args);
Py_DECREF(args); /* also removes list */
Py_DECREF(function);
result = PyUnicode_Join(joiner, list);
Py_DECREF(joiner);
if (result)
Py_DECREF(list);
return result;
}
@ -399,6 +361,7 @@ element_init(PyObject *self, PyObject *args, PyObject *kwds)
return -1;
if (kwds) {
if (PyDict_Update(attrib, kwds) < 0) {
Py_DECREF(attrib);
return -1;
}
}
@ -407,38 +370,34 @@ element_init(PyObject *self, PyObject *args, PyObject *kwds)
attrib = get_attrib_from_keywords(kwds);
if (!attrib)
return -1;
} else {
/* no attrib arg, no kwds, so no attributes */
Py_INCREF(Py_None);
attrib = Py_None;
}
self_elem = (ElementObject *)self;
if (attrib != Py_None && !is_empty_dict(attrib)) {
if (attrib != NULL && !is_empty_dict(attrib)) {
if (create_extra(self_elem, attrib) < 0) {
PyObject_Del(self_elem);
Py_DECREF(attrib);
return -1;
}
}
/* We own a reference to attrib here and it's no longer needed. */
Py_DECREF(attrib);
Py_XDECREF(attrib);
/* Replace the objects already pointed to by tag, text and tail. */
tmp = self_elem->tag;
self_elem->tag = tag;
Py_INCREF(tag);
self_elem->tag = tag;
Py_DECREF(tmp);
tmp = self_elem->text;
self_elem->text = Py_None;
Py_INCREF(Py_None);
self_elem->text = Py_None;
Py_DECREF(JOIN_OBJ(tmp));
tmp = self_elem->tail;
self_elem->tail = Py_None;
Py_INCREF(Py_None);
self_elem->tail = Py_None;
Py_DECREF(JOIN_OBJ(tmp));
return 0;
@ -520,11 +479,11 @@ element_get_attrib(ElementObject* self)
PyObject* res = self->extra->attrib;
if (res == Py_None) {
Py_DECREF(res);
/* create missing dictionary */
res = PyDict_New();
if (!res)
return NULL;
Py_DECREF(Py_None);
self->extra->attrib = res;
}
@ -824,7 +783,7 @@ element_deepcopy(ElementObject* self, PyObject* args)
}
/* add object to memo dictionary (so deepcopy won't visit it again) */
id = PyLong_FromLong((Py_uintptr_t) self);
id = PyLong_FromSsize_t((Py_uintptr_t) self);
if (!id)
goto error;
@ -2081,6 +2040,7 @@ treebuilder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
if (!t->stack) {
Py_DECREF(t->this);
Py_DECREF(t->last);
Py_DECREF((PyObject *) t);
return NULL;
}
t->index = 0;
@ -2098,6 +2058,7 @@ treebuilder_init(PyObject *self, PyObject *args, PyObject *kwds)
static char *kwlist[] = {"element_factory", 0};
PyObject *element_factory = NULL;
TreeBuilderObject *self_tb = (TreeBuilderObject *)self;
PyObject *tmp;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:TreeBuilder", kwlist,
&element_factory)) {
@ -2106,8 +2067,9 @@ treebuilder_init(PyObject *self, PyObject *args, PyObject *kwds)
if (element_factory) {
Py_INCREF(element_factory);
Py_XDECREF(self_tb->element_factory);
tmp = self_tb->element_factory;
self_tb->element_factory = element_factory;
Py_XDECREF(tmp);
}
return 0;
@ -2128,17 +2090,17 @@ treebuilder_gc_traverse(TreeBuilderObject *self, visitproc visit, void *arg)
static int
treebuilder_gc_clear(TreeBuilderObject *self)
{
Py_XDECREF(self->end_ns_event_obj);
Py_XDECREF(self->start_ns_event_obj);
Py_XDECREF(self->end_event_obj);
Py_XDECREF(self->start_event_obj);
Py_XDECREF(self->events);
Py_DECREF(self->stack);
Py_XDECREF(self->data);
Py_DECREF(self->last);
Py_DECREF(self->this);
Py_CLEAR(self->end_ns_event_obj);
Py_CLEAR(self->start_ns_event_obj);
Py_CLEAR(self->end_event_obj);
Py_CLEAR(self->start_event_obj);
Py_CLEAR(self->events);
Py_CLEAR(self->stack);
Py_CLEAR(self->data);
Py_CLEAR(self->last);
Py_CLEAR(self->this);
Py_CLEAR(self->element_factory);
Py_XDECREF(self->root);
Py_CLEAR(self->root);
return 0;
}
@ -2222,10 +2184,8 @@ treebuilder_handle_start(TreeBuilderObject* self, PyObject* tag,
if (self->start_event_obj) {
PyObject* res;
PyObject* action = self->start_event_obj;
res = PyTuple_New(2);
res = PyTuple_Pack(2, action, node);
if (res) {
Py_INCREF(action); PyTuple_SET_ITEM(res, 0, (PyObject*) action);
Py_INCREF(node); PyTuple_SET_ITEM(res, 1, (PyObject*) node);
PyList_Append(self->events, res);
Py_DECREF(res);
} else
@ -2253,6 +2213,7 @@ treebuilder_handle_data(TreeBuilderObject* self, PyObject* data)
/* more than one item; use a list to collect items */
if (PyBytes_CheckExact(self->data) && Py_REFCNT(self->data) == 1 &&
PyBytes_CheckExact(data) && PyBytes_GET_SIZE(data) == 1) {
/* XXX this code path unused in Python 3? */
/* expat often generates single character data sections; handle
the most common case by resizing the existing string... */
Py_ssize_t size = PyBytes_GET_SIZE(self->data);
@ -2317,10 +2278,8 @@ treebuilder_handle_end(TreeBuilderObject* self, PyObject* tag)
PyObject* res;
PyObject* action = self->end_event_obj;
PyObject* node = (PyObject*) self->last;
res = PyTuple_New(2);
res = PyTuple_Pack(2, action, node);
if (res) {
Py_INCREF(action); PyTuple_SET_ITEM(res, 0, (PyObject*) action);
Py_INCREF(node); PyTuple_SET_ITEM(res, 1, (PyObject*) node);
PyList_Append(self->events, res);
Py_DECREF(res);
} else
@ -2366,8 +2325,12 @@ treebuilder_handle_namespace(TreeBuilderObject* self, int start,
PyTuple_SET_ITEM(res, 1, parcel);
PyList_Append(self->events, res);
Py_DECREF(res);
} else
}
else {
Py_DECREF(action);
Py_DECREF(parcel);
PyErr_Clear(); /* FIXME: propagate error */
}
}
/* -------------------------------------------------------------------- */
@ -2526,7 +2489,7 @@ makeuniversal(XMLParserObject* self, const char* string)
/* convert a UTF-8 tag/attribute name from the expat parser
to a universal name string */
int size = strlen(string);
Py_ssize_t size = (Py_ssize_t) strlen(string);
PyObject* key;
PyObject* value;
@ -2545,7 +2508,7 @@ makeuniversal(XMLParserObject* self, const char* string)
PyObject* tag;
char* p;
int i;
Py_ssize_t i;
/* look for namespace separator */
for (i = 0; i < size; i++)
@ -2717,13 +2680,7 @@ expat_start_handler(XMLParserObject* self, const XML_Char* tag_in,
attrib_in += 2;
}
} else {
Py_INCREF(Py_None);
attrib = Py_None;
}
/* If we get None, pass an empty dictionary on */
if (attrib == Py_None) {
Py_DECREF(attrib);
/* Pass an empty dictionary on */
attrib = PyDict_New();
if (!attrib)
return;
@ -3015,14 +2972,14 @@ xmlparser_init(PyObject *self, PyObject *args, PyObject *kwds)
self_xp->names = PyDict_New();
if (!self_xp->names) {
Py_XDECREF(self_xp->entity);
Py_CLEAR(self_xp->entity);
return -1;
}
self_xp->parser = EXPAT(ParserCreate_MM)(encoding, &ExpatMemoryHandler, "}");
if (!self_xp->parser) {
Py_XDECREF(self_xp->entity);
Py_XDECREF(self_xp->names);
Py_CLEAR(self_xp->entity);
Py_CLEAR(self_xp->names);
PyErr_NoMemory();
return -1;
}
@ -3032,8 +2989,8 @@ xmlparser_init(PyObject *self, PyObject *args, PyObject *kwds)
} else {
target = treebuilder_new(&TreeBuilder_Type, NULL, NULL);
if (!target) {
Py_XDECREF(self_xp->entity);
Py_XDECREF(self_xp->names);
Py_CLEAR(self_xp->entity);
Py_CLEAR(self_xp->names);
EXPAT(ParserFree)(self_xp->parser);
return -1;
}
@ -3109,17 +3066,17 @@ xmlparser_gc_clear(XMLParserObject *self)
{
EXPAT(ParserFree)(self->parser);
Py_XDECREF(self->handle_close);
Py_XDECREF(self->handle_pi);
Py_XDECREF(self->handle_comment);
Py_XDECREF(self->handle_end);
Py_XDECREF(self->handle_data);
Py_XDECREF(self->handle_start);
Py_XDECREF(self->handle_doctype);
Py_CLEAR(self->handle_close);
Py_CLEAR(self->handle_pi);
Py_CLEAR(self->handle_comment);
Py_CLEAR(self->handle_end);
Py_CLEAR(self->handle_data);
Py_CLEAR(self->handle_start);
Py_CLEAR(self->handle_doctype);
Py_XDECREF(self->target);
Py_XDECREF(self->entity);
Py_XDECREF(self->names);
Py_CLEAR(self->target);
Py_CLEAR(self->entity);
Py_CLEAR(self->names);
return 0;
}
@ -3227,17 +3184,12 @@ xmlparser_parse(XMLParserObject* self, PyObject* args)
break;
}
temp = PyUnicode_AsEncodedString(buffer, "utf-8", "surrogatepass");
Py_DECREF(buffer);
if (!temp) {
/* Propagate exception from PyUnicode_AsEncodedString */
Py_DECREF(buffer);
Py_DECREF(reader);
return NULL;
}
/* Here we no longer need the original buffer since it contains
* unicode. Make it point to the encoded bytes object.
*/
Py_DECREF(buffer);
buffer = temp;
}
else if (!PyBytes_CheckExact(buffer) || PyBytes_GET_SIZE(buffer) == 0) {
@ -3307,10 +3259,10 @@ xmlparser_setevents(XMLParserObject *self, PyObject* args)
target->events = events;
/* clear out existing events */
Py_XDECREF(target->start_event_obj); target->start_event_obj = NULL;
Py_XDECREF(target->end_event_obj); target->end_event_obj = NULL;
Py_XDECREF(target->start_ns_event_obj); target->start_ns_event_obj = NULL;
Py_XDECREF(target->end_ns_event_obj); target->end_ns_event_obj = NULL;
Py_CLEAR(target->start_event_obj);
Py_CLEAR(target->end_event_obj);
Py_CLEAR(target->start_ns_event_obj);
Py_CLEAR(target->end_ns_event_obj);
if (event_set == Py_None) {
/* default is "end" only */