_elementtree.c 81.4 KB
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/*
 * ElementTree
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 * $Id: _elementtree.c 3473 2009-01-11 22:53:55Z fredrik $
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 *
 * elementtree accelerator
 *
 * History:
 * 1999-06-20 fl  created (as part of sgmlop)
 * 2001-05-29 fl  effdom edition
 * 2003-02-27 fl  elementtree edition (alpha)
 * 2004-06-03 fl  updates for elementtree 1.2
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 * 2005-01-05 fl  major optimization effort
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 * 2005-01-11 fl  first public release (cElementTree 0.8)
 * 2005-01-12 fl  split element object into base and extras
 * 2005-01-13 fl  use tagged pointers for tail/text (cElementTree 0.9)
 * 2005-01-17 fl  added treebuilder close method
 * 2005-01-17 fl  fixed crash in getchildren
 * 2005-01-18 fl  removed observer api, added iterparse (cElementTree 0.9.3)
 * 2005-01-23 fl  revised iterparse api; added namespace event support (0.9.8)
 * 2005-01-26 fl  added VERSION module property (cElementTree 1.0)
 * 2005-01-28 fl  added remove method (1.0.1)
 * 2005-03-01 fl  added iselement function; fixed makeelement aliasing (1.0.2)
 * 2005-03-13 fl  export Comment and ProcessingInstruction/PI helpers
 * 2005-03-26 fl  added Comment and PI support to XMLParser
 * 2005-03-27 fl  event optimizations; complain about bogus events
 * 2005-08-08 fl  fixed read error handling in parse
 * 2005-08-11 fl  added runtime test for copy workaround (1.0.3)
 * 2005-12-13 fl  added expat_capi support (for xml.etree) (1.0.4)
 * 2005-12-16 fl  added support for non-standard encodings
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 * 2006-03-08 fl  fixed a couple of potential null-refs and leaks
 * 2006-03-12 fl  merge in 2.5 ssize_t changes
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 * 2007-08-25 fl  call custom builder's close method from XMLParser
 * 2007-08-31 fl  added iter, extend from ET 1.3
 * 2007-09-01 fl  fixed ParseError exception, setslice source type, etc
 * 2007-09-03 fl  fixed handling of negative insert indexes
 * 2007-09-04 fl  added itertext from ET 1.3
 * 2007-09-06 fl  added position attribute to ParseError exception
 * 2008-06-06 fl  delay error reporting in iterparse (from Hrvoje Niksic)
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 *
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 * Copyright (c) 1999-2009 by Secret Labs AB.  All rights reserved.
 * Copyright (c) 1999-2009 by Fredrik Lundh.
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 *
 * info@pythonware.com
 * http://www.pythonware.com
 */

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/* Licensed to PSF under a Contributor Agreement. */
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/* See http://www.python.org/psf/license for licensing details. */
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#include "Python.h"

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#define VERSION "1.0.6"
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/* -------------------------------------------------------------------- */
/* configuration */

/* Leave defined to include the expat-based XMLParser type */
#define USE_EXPAT

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/* Define to do all expat calls via pyexpat's embedded expat library */
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/* #define USE_PYEXPAT_CAPI */

/* An element can hold this many children without extra memory
   allocations. */
#define STATIC_CHILDREN 4

/* For best performance, chose a value so that 80-90% of all nodes
   have no more than the given number of children.  Set this to zero
   to minimize the size of the element structure itself (this only
   helps if you have lots of leaf nodes with attributes). */

/* Also note that pymalloc always allocates blocks in multiples of
   eight bytes.  For the current version of cElementTree, this means
   that the number of children should be an even number, at least on
   32-bit platforms. */

/* -------------------------------------------------------------------- */

#if 0
static int memory = 0;
#define ALLOC(size, comment)\
do { memory += size; printf("%8d - %s\n", memory, comment); } while (0)
#define RELEASE(size, comment)\
do { memory -= size; printf("%8d - %s\n", memory, comment); } while (0)
#else
#define ALLOC(size, comment)
#define RELEASE(size, comment)
#endif

/* compiler tweaks */
#if defined(_MSC_VER)
#define LOCAL(type) static __inline type __fastcall
#else
#define LOCAL(type) static type
#endif

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/* compatibility macros */
#if (PY_VERSION_HEX < 0x02060000)
#define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
#define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
#endif

#if (PY_VERSION_HEX < 0x02050000)
typedef int Py_ssize_t;
#define lenfunc inquiry
#endif

#if (PY_VERSION_HEX < 0x02040000)
#define PyDict_CheckExact PyDict_Check

#if !defined(Py_RETURN_NONE)
#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
#endif
#endif

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/* macros used to store 'join' flags in string object pointers.  note
   that all use of text and tail as object pointers must be wrapped in
   JOIN_OBJ.  see comments in the ElementObject definition for more
   info. */
#define JOIN_GET(p) ((Py_uintptr_t) (p) & 1)
#define JOIN_SET(p, flag) ((void*) ((Py_uintptr_t) (JOIN_OBJ(p)) | (flag)))
#define JOIN_OBJ(p) ((PyObject*) ((Py_uintptr_t) (p) & ~1))

/* glue functions (see the init function for details) */
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static PyObject* elementtree_parseerror_obj;
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static PyObject* elementtree_copyelement_obj;
static PyObject* elementtree_deepcopy_obj;
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static PyObject* elementtree_iter_obj;
static PyObject* elementtree_itertext_obj;
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static PyObject* elementpath_obj;

/* helpers */

LOCAL(PyObject*)
deepcopy(PyObject* object, PyObject* memo)
{
    /* do a deep copy of the given object */

    PyObject* args;
    PyObject* result;

    if (!elementtree_deepcopy_obj) {
        PyErr_SetString(
            PyExc_RuntimeError,
            "deepcopy helper not found"
            );
        return NULL;
    }

    args = PyTuple_New(2);
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    if (!args)
        return NULL;

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    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;
}

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);
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        return PyBytes_FromString("");
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    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);
    if (!joiner)
        return NULL;

    function = PyObject_GetAttrString(joiner, "join");
    if (!function) {
        Py_DECREF(joiner);
        return NULL;
    }

    args = PyTuple_New(1);
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    if (!args)
        return NULL;

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    PyTuple_SET_ITEM(args, 0, list);

    result = PyObject_CallObject(function, args);

    Py_DECREF(args); /* also removes list */
    Py_DECREF(function);
    Py_DECREF(joiner);

    return result;
}

/* -------------------------------------------------------------------- */
/* the element type */

typedef struct {

    /* attributes (a dictionary object), or None if no attributes */
    PyObject* attrib;

    /* child elements */
    int length; /* actual number of items */
    int allocated; /* allocated items */

    /* this either points to _children or to a malloced buffer */
    PyObject* *children;

    PyObject* _children[STATIC_CHILDREN];
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} ElementObjectExtra;

typedef struct {
    PyObject_HEAD

    /* element tag (a string). */
    PyObject* tag;

    /* text before first child.  note that this is a tagged pointer;
       use JOIN_OBJ to get the object pointer.  the join flag is used
       to distinguish lists created by the tree builder from lists
       assigned to the attribute by application code; the former
       should be joined before being returned to the user, the latter
       should be left intact. */
    PyObject* text;

    /* text after this element, in parent.  note that this is a tagged
       pointer; use JOIN_OBJ to get the object pointer. */
    PyObject* tail;

    ElementObjectExtra* extra;

} ElementObject;

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static PyTypeObject Element_Type;
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#define Element_CheckExact(op) (Py_TYPE(op) == &Element_Type)
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/* -------------------------------------------------------------------- */
/* element constructor and destructor */

LOCAL(int)
element_new_extra(ElementObject* self, PyObject* attrib)
{
    self->extra = PyObject_Malloc(sizeof(ElementObjectExtra));
    if (!self->extra)
        return -1;

    if (!attrib)
        attrib = Py_None;

    Py_INCREF(attrib);
    self->extra->attrib = attrib;

    self->extra->length = 0;
    self->extra->allocated = STATIC_CHILDREN;
    self->extra->children = self->extra->_children;

    return 0;
}

LOCAL(void)
element_dealloc_extra(ElementObject* self)
{
    int i;

    Py_DECREF(self->extra->attrib);

    for (i = 0; i < self->extra->length; i++)
        Py_DECREF(self->extra->children[i]);

    if (self->extra->children != self->extra->_children)
        PyObject_Free(self->extra->children);

    PyObject_Free(self->extra);
}

LOCAL(PyObject*)
element_new(PyObject* tag, PyObject* attrib)
{
    ElementObject* self;

    self = PyObject_New(ElementObject, &Element_Type);
    if (self == NULL)
        return NULL;

    /* use None for empty dictionaries */
    if (PyDict_CheckExact(attrib) && !PyDict_Size(attrib))
        attrib = Py_None;

    self->extra = NULL;

    if (attrib != Py_None) {

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        if (element_new_extra(self, attrib) < 0) {
            PyObject_Del(self);
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            return NULL;
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        }
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        self->extra->length = 0;
        self->extra->allocated = STATIC_CHILDREN;
        self->extra->children = self->extra->_children;

    }

    Py_INCREF(tag);
    self->tag = tag;

    Py_INCREF(Py_None);
    self->text = Py_None;

    Py_INCREF(Py_None);
    self->tail = Py_None;

    ALLOC(sizeof(ElementObject), "create element");

    return (PyObject*) self;
}

LOCAL(int)
element_resize(ElementObject* self, int extra)
{
    int size;
    PyObject* *children;

    /* make sure self->children can hold the given number of extra
       elements.  set an exception and return -1 if allocation failed */

    if (!self->extra)
        element_new_extra(self, NULL);

    size = self->extra->length + extra;

    if (size > self->extra->allocated) {
        /* use Python 2.4's list growth strategy */
        size = (size >> 3) + (size < 9 ? 3 : 6) + size;
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        /* Coverity CID #182 size_error: Allocating 1 bytes to pointer "children"
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         * which needs at least 4 bytes.
         * Although it's a false alarm always assume at least one child to
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         * be safe.
         */
        size = size ? size : 1;
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        if (self->extra->children != self->extra->_children) {
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            /* Coverity CID #182 size_error: Allocating 1 bytes to pointer
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             * "children", which needs at least 4 bytes. Although it's a
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             * false alarm always assume at least one child to be safe.
             */
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            children = PyObject_Realloc(self->extra->children,
                                        size * sizeof(PyObject*));
            if (!children)
                goto nomemory;
        } else {
            children = PyObject_Malloc(size * sizeof(PyObject*));
            if (!children)
                goto nomemory;
            /* copy existing children from static area to malloc buffer */
            memcpy(children, self->extra->children,
                   self->extra->length * sizeof(PyObject*));
        }
        self->extra->children = children;
        self->extra->allocated = size;
    }

    return 0;

  nomemory:
    PyErr_NoMemory();
    return -1;
}

LOCAL(int)
element_add_subelement(ElementObject* self, PyObject* element)
{
    /* add a child element to a parent */

    if (element_resize(self, 1) < 0)
        return -1;

    Py_INCREF(element);
    self->extra->children[self->extra->length] = element;

    self->extra->length++;

    return 0;
}

LOCAL(PyObject*)
element_get_attrib(ElementObject* self)
{
    /* return borrowed reference to attrib dictionary */
    /* note: this function assumes that the extra section exists */

    PyObject* res = self->extra->attrib;

    if (res == Py_None) {
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        Py_DECREF(res);
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        /* create missing dictionary */
        res = PyDict_New();
        if (!res)
            return NULL;
        self->extra->attrib = res;
    }

    return res;
}

LOCAL(PyObject*)
element_get_text(ElementObject* self)
{
    /* return borrowed reference to text attribute */

    PyObject* res = self->text;

    if (JOIN_GET(res)) {
        res = JOIN_OBJ(res);
        if (PyList_CheckExact(res)) {
            res = list_join(res);
            if (!res)
                return NULL;
            self->text = res;
        }
    }

    return res;
}

LOCAL(PyObject*)
element_get_tail(ElementObject* self)
{
    /* return borrowed reference to text attribute */

    PyObject* res = self->tail;

    if (JOIN_GET(res)) {
        res = JOIN_OBJ(res);
        if (PyList_CheckExact(res)) {
            res = list_join(res);
            if (!res)
                return NULL;
            self->tail = res;
        }
    }

    return res;
}

static PyObject*
element(PyObject* self, PyObject* args, PyObject* kw)
{
    PyObject* elem;

    PyObject* tag;
    PyObject* attrib = NULL;
    if (!PyArg_ParseTuple(args, "O|O!:Element", &tag,
                          &PyDict_Type, &attrib))
        return NULL;

    if (attrib || kw) {
        attrib = (attrib) ? PyDict_Copy(attrib) : PyDict_New();
        if (!attrib)
            return NULL;
        if (kw)
            PyDict_Update(attrib, kw);
    } else {
        Py_INCREF(Py_None);
        attrib = Py_None;
    }

    elem = element_new(tag, attrib);

    Py_DECREF(attrib);

    return elem;
}

static PyObject*
subelement(PyObject* self, PyObject* args, PyObject* kw)
{
    PyObject* elem;

    ElementObject* parent;
    PyObject* tag;
    PyObject* attrib = NULL;
    if (!PyArg_ParseTuple(args, "O!O|O!:SubElement",
                          &Element_Type, &parent, &tag,
                          &PyDict_Type, &attrib))
        return NULL;

    if (attrib || kw) {
        attrib = (attrib) ? PyDict_Copy(attrib) : PyDict_New();
        if (!attrib)
            return NULL;
        if (kw)
            PyDict_Update(attrib, kw);
    } else {
        Py_INCREF(Py_None);
        attrib = Py_None;
    }

    elem = element_new(tag, attrib);

    Py_DECREF(attrib);

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    if (element_add_subelement(parent, elem) < 0) {
        Py_DECREF(elem);
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        return NULL;
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    }
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    return elem;
}

static void
element_dealloc(ElementObject* self)
{
    if (self->extra)
        element_dealloc_extra(self);

    /* discard attributes */
    Py_DECREF(self->tag);
    Py_DECREF(JOIN_OBJ(self->text));
    Py_DECREF(JOIN_OBJ(self->tail));

    RELEASE(sizeof(ElementObject), "destroy element");

    PyObject_Del(self);
}

/* -------------------------------------------------------------------- */
/* methods (in alphabetical order) */

static PyObject*
element_append(ElementObject* self, PyObject* args)
{
    PyObject* element;
    if (!PyArg_ParseTuple(args, "O!:append", &Element_Type, &element))
        return NULL;

    if (element_add_subelement(self, element) < 0)
        return NULL;

    Py_RETURN_NONE;
}

static PyObject*
element_clear(ElementObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ":clear"))
        return NULL;

    if (self->extra) {
        element_dealloc_extra(self);
        self->extra = NULL;
    }

    Py_INCREF(Py_None);
    Py_DECREF(JOIN_OBJ(self->text));
    self->text = Py_None;

    Py_INCREF(Py_None);
    Py_DECREF(JOIN_OBJ(self->tail));
    self->tail = Py_None;

    Py_RETURN_NONE;
}

static PyObject*
element_copy(ElementObject* self, PyObject* args)
{
    int i;
    ElementObject* element;

    if (!PyArg_ParseTuple(args, ":__copy__"))
        return NULL;

    element = (ElementObject*) element_new(
        self->tag, (self->extra) ? self->extra->attrib : Py_None
        );
    if (!element)
        return NULL;

    Py_DECREF(JOIN_OBJ(element->text));
    element->text = self->text;
    Py_INCREF(JOIN_OBJ(element->text));

    Py_DECREF(JOIN_OBJ(element->tail));
    element->tail = self->tail;
    Py_INCREF(JOIN_OBJ(element->tail));

    if (self->extra) {
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        if (element_resize(element, self->extra->length) < 0) {
            Py_DECREF(element);
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            return NULL;
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        }
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        for (i = 0; i < self->extra->length; i++) {
            Py_INCREF(self->extra->children[i]);
            element->extra->children[i] = self->extra->children[i];
        }

        element->extra->length = self->extra->length;
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    }

    return (PyObject*) element;
}

static PyObject*
element_deepcopy(ElementObject* self, PyObject* args)
{
    int i;
    ElementObject* element;
    PyObject* tag;
    PyObject* attrib;
    PyObject* text;
    PyObject* tail;
    PyObject* id;

    PyObject* memo;
    if (!PyArg_ParseTuple(args, "O:__deepcopy__", &memo))
        return NULL;

    tag = deepcopy(self->tag, memo);
    if (!tag)
        return NULL;

    if (self->extra) {
        attrib = deepcopy(self->extra->attrib, memo);
        if (!attrib) {
            Py_DECREF(tag);
            return NULL;
        }
    } else {
        Py_INCREF(Py_None);
        attrib = Py_None;
    }

    element = (ElementObject*) element_new(tag, attrib);

    Py_DECREF(tag);
    Py_DECREF(attrib);

    if (!element)
        return NULL;
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    text = deepcopy(JOIN_OBJ(self->text), memo);
    if (!text)
        goto error;
    Py_DECREF(element->text);
    element->text = JOIN_SET(text, JOIN_GET(self->text));

    tail = deepcopy(JOIN_OBJ(self->tail), memo);
    if (!tail)
        goto error;
    Py_DECREF(element->tail);
    element->tail = JOIN_SET(tail, JOIN_GET(self->tail));

    if (self->extra) {
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        if (element_resize(element, self->extra->length) < 0)
            goto error;

        for (i = 0; i < self->extra->length; i++) {
            PyObject* child = deepcopy(self->extra->children[i], memo);
            if (!child) {
                element->extra->length = i;
                goto error;
            }
            element->extra->children[i] = child;
        }

        element->extra->length = self->extra->length;
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    }

    /* add object to memo dictionary (so deepcopy won't visit it again) */
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    id = PyLong_FromLong((Py_uintptr_t) self);
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    if (!id)
        goto error;
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    i = PyDict_SetItem(memo, id, (PyObject*) element);

    Py_DECREF(id);

    if (i < 0)
        goto error;

    return (PyObject*) element;

  error:
    Py_DECREF(element);
    return NULL;
}

LOCAL(int)
checkpath(PyObject* tag)
{
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    Py_ssize_t i;
    int check = 1;
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    /* check if a tag contains an xpath character */

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#define PATHCHAR(ch) \
    (ch == '/' || ch == '*' || ch == '[' || ch == '@' || ch == '.')
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    if (PyUnicode_Check(tag)) {
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        const Py_ssize_t len = PyUnicode_GET_LENGTH(tag);
        void *data = PyUnicode_DATA(tag);
        unsigned int kind = PyUnicode_KIND(tag);
        for (i = 0; i < len; i++) {
            Py_UCS4 ch = PyUnicode_READ(kind, data, i);
            if (ch == '{')
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                check = 0;
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            else if (ch == '}')
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                check = 1;
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            else if (check && PATHCHAR(ch))
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                return 1;
        }
        return 0;
    }
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    if (PyBytes_Check(tag)) {
        char *p = PyBytes_AS_STRING(tag);
        for (i = 0; i < PyBytes_GET_SIZE(tag); i++) {
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            if (p[i] == '{')
                check = 0;
            else if (p[i] == '}')
                check = 1;
            else if (check && PATHCHAR(p[i]))
                return 1;
        }
        return 0;
    }

    return 1; /* unknown type; might be path expression */
}

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static PyObject*
element_extend(ElementObject* self, PyObject* args)
{
    PyObject* seq;
    Py_ssize_t i, seqlen = 0;

    PyObject* seq_in;
    if (!PyArg_ParseTuple(args, "O:extend", &seq_in))
        return NULL;

    seq = PySequence_Fast(seq_in, "");
    if (!seq) {
        PyErr_Format(
            PyExc_TypeError,
            "expected sequence, not \"%.200s\"", Py_TYPE(seq_in)->tp_name
            );
        return NULL;
    }

    seqlen = PySequence_Size(seq);
    for (i = 0; i < seqlen; i++) {
        PyObject* element = PySequence_Fast_GET_ITEM(seq, i);
        if (element_add_subelement(self, element) < 0) {
            Py_DECREF(seq);
            return NULL;
        }
    }

    Py_DECREF(seq);

    Py_RETURN_NONE;
}

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static PyObject*
element_find(ElementObject* self, PyObject* args)
{
    int i;
    PyObject* tag;
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    PyObject* namespaces = Py_None;
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    if (!PyArg_ParseTuple(args, "O|O:find", &tag, &namespaces))
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        return NULL;

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    if (checkpath(tag) || namespaces != Py_None) {
        _Py_identifier(find);
        return _PyObject_CallMethodId(
            elementpath_obj, &PyId_find, "OOO", self, tag, namespaces
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            );
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    }
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    if (!self->extra)
        Py_RETURN_NONE;
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    for (i = 0; i < self->extra->length; i++) {
        PyObject* item = self->extra->children[i];
        if (Element_CheckExact(item) &&
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            PyObject_RichCompareBool(((ElementObject*)item)->tag, tag, Py_EQ) == 1) {
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            Py_INCREF(item);
            return item;
        }
    }

    Py_RETURN_NONE;
}

static PyObject*
element_findtext(ElementObject* self, PyObject* args)
{
    int i;
    PyObject* tag;
    PyObject* default_value = Py_None;
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    PyObject* namespaces = Py_None;
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    _Py_identifier(findtext);

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    if (!PyArg_ParseTuple(args, "O|OO:findtext", &tag, &default_value, &namespaces))
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        return NULL;

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    if (checkpath(tag) || namespaces != Py_None)
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        return _PyObject_CallMethodId(
            elementpath_obj, &PyId_findtext, "OOOO", self, tag, default_value, namespaces
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            );

    if (!self->extra) {
        Py_INCREF(default_value);
        return default_value;
    }

    for (i = 0; i < self->extra->length; i++) {
        ElementObject* item = (ElementObject*) self->extra->children[i];
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        if (Element_CheckExact(item) && (PyObject_RichCompareBool(item->tag, tag, Py_EQ) == 1)) {

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            PyObject* text = element_get_text(item);
            if (text == Py_None)
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                return PyBytes_FromString("");
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            Py_XINCREF(text);
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            return text;
        }
    }

    Py_INCREF(default_value);
    return default_value;
}

static PyObject*
element_findall(ElementObject* self, PyObject* args)
{
    int i;
    PyObject* out;
    PyObject* tag;
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    PyObject* namespaces = Py_None;
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    if (!PyArg_ParseTuple(args, "O|O:findall", &tag, &namespaces))
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        return NULL;

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    if (checkpath(tag) || namespaces != Py_None) {
        _Py_identifier(findall);
        return _PyObject_CallMethodId(
            elementpath_obj, &PyId_findall, "OOO", self, tag, namespaces
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            );
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    }
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    out = PyList_New(0);
    if (!out)
        return NULL;

    if (!self->extra)
        return out;

    for (i = 0; i < self->extra->length; i++) {
        PyObject* item = self->extra->children[i];
        if (Element_CheckExact(item) &&
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            PyObject_RichCompareBool(((ElementObject*)item)->tag, tag, Py_EQ) == 1) {
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            if (PyList_Append(out, item) < 0) {
                Py_DECREF(out);
                return NULL;
            }
        }
    }

    return out;
}

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static PyObject*
element_iterfind(ElementObject* self, PyObject* args)
{
    PyObject* tag;
    PyObject* namespaces = Py_None;
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    _Py_identifier(iterfind);

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    if (!PyArg_ParseTuple(args, "O|O:iterfind", &tag, &namespaces))
        return NULL;

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    return _PyObject_CallMethodId(
        elementpath_obj, &PyId_iterfind, "OOO", self, tag, namespaces
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        );
}

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static PyObject*
element_get(ElementObject* self, PyObject* args)
{
    PyObject* value;

    PyObject* key;
    PyObject* default_value = Py_None;
    if (!PyArg_ParseTuple(args, "O|O:get", &key, &default_value))
        return NULL;

    if (!self->extra || self->extra->attrib == Py_None)
        value = default_value;
    else {
        value = PyDict_GetItem(self->extra->attrib, key);
        if (!value)
            value = default_value;
    }

    Py_INCREF(value);
    return value;
}

static PyObject*
element_getchildren(ElementObject* self, PyObject* args)
{
    int i;
    PyObject* list;

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    /* FIXME: report as deprecated? */

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    if (!PyArg_ParseTuple(args, ":getchildren"))
        return NULL;

    if (!self->extra)
        return PyList_New(0);

    list = PyList_New(self->extra->length);
    if (!list)
        return NULL;

    for (i = 0; i < self->extra->length; i++) {
        PyObject* item = self->extra->children[i];
        Py_INCREF(item);
        PyList_SET_ITEM(list, i, item);
    }

    return list;
}

static PyObject*
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element_iter(ElementObject* self, PyObject* args)
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{
    PyObject* result;
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    PyObject* tag = Py_None;
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    if (!PyArg_ParseTuple(args, "|O:iter", &tag))
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        return NULL;

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    if (!elementtree_iter_obj) {
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        PyErr_SetString(
            PyExc_RuntimeError,
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            "iter helper not found"
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            );
        return NULL;
    }

    args = PyTuple_New(2);
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    if (!args)
        return NULL;
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    Py_INCREF(self); PyTuple_SET_ITEM(args, 0, (PyObject*) self);
    Py_INCREF(tag);  PyTuple_SET_ITEM(args, 1, (PyObject*) tag);

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    result = PyObject_CallObject(elementtree_iter_obj, args);
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    Py_DECREF(args);

    return result;
}

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static PyObject*
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element_itertext(ElementObject* self, PyObject* args)
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{
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    PyObject* result;
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    if (!PyArg_ParseTuple(args, ":itertext"))
        return NULL;
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    if (!elementtree_itertext_obj) {
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        PyErr_SetString(
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            PyExc_RuntimeError,
            "itertext helper not found"
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            );
        return NULL;
    }

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    args = PyTuple_New(1);
    if (!args)
        return NULL;

    Py_INCREF(self); PyTuple_SET_ITEM(args, 0, (PyObject*) self);

    result = PyObject_CallObject(elementtree_itertext_obj, args);

    Py_DECREF(args);

    return result;
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}

static PyObject*
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element_getitem(PyObject* self_, Py_ssize_t index)
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{
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    ElementObject* self = (ElementObject*) self_;
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    if (!self->extra || index < 0 || index >= self->extra->length) {
        PyErr_SetString(
            PyExc_IndexError,
            "child index out of range"
            );
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        return NULL;
    }

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    Py_INCREF(self->extra->children[index]);
    return self->extra->children[index];
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}

static PyObject*
element_insert(ElementObject* self, PyObject* args)
{
    int i;

    int index;
    PyObject* element;
    if (!PyArg_ParseTuple(args, "iO!:insert", &index,
                          &Element_Type, &element))
        return NULL;

    if (!self->extra)
        element_new_extra(self, NULL);

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    if (index < 0) {
        index += self->extra->length;
        if (index < 0)
            index = 0;
    }
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    if (index > self->extra->length)
        index = self->extra->length;

    if (element_resize(self, 1) < 0)
        return NULL;

    for (i = self->extra->length; i > index; i--)
        self->extra->children[i] = self->extra->children[i-1];

    Py_INCREF(element);
    self->extra->children[index] = element;

    self->extra->length++;

    Py_RETURN_NONE;
}

static PyObject*
element_items(ElementObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ":items"))
        return NULL;

    if (!self->extra || self->extra->attrib == Py_None)
        return PyList_New(0);

    return PyDict_Items(self->extra->attrib);
}

static PyObject*
element_keys(ElementObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ":keys"))
        return NULL;

    if (!self->extra || self->extra->attrib == Py_None)
        return PyList_New(0);

    return PyDict_Keys(self->extra->attrib);
}

Martin v. Löwis's avatar
Martin v. Löwis committed
1100
static Py_ssize_t
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element_length(ElementObject* self)
{
    if (!self->extra)
        return 0;

    return self->extra->length;
}

static PyObject*
element_makeelement(PyObject* self, PyObject* args, PyObject* kw)
{
    PyObject* elem;

    PyObject* tag;
    PyObject* attrib;
    if (!PyArg_ParseTuple(args, "OO:makeelement", &tag, &attrib))
        return NULL;

    attrib = PyDict_Copy(attrib);
    if (!attrib)
        return NULL;

    elem = element_new(tag, attrib);

    Py_DECREF(attrib);

    return elem;
}

static PyObject*
element_reduce(ElementObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ":__reduce__"))
        return NULL;

    /* Hack alert: This method is used to work around a __copy__
       problem on certain 2.3 and 2.4 versions.  To save time and
       simplify the code, we create the copy in here, and use a dummy
       copyelement helper to trick the copy module into doing the
       right thing. */

    if (!elementtree_copyelement_obj) {
        PyErr_SetString(
            PyExc_RuntimeError,
            "copyelement helper not found"
            );
        return NULL;
    }

    return Py_BuildValue(
        "O(N)", elementtree_copyelement_obj, element_copy(self, args)
        );
}

static PyObject*
element_remove(ElementObject* self, PyObject* args)
{
    int i;

    PyObject* element;
    if (!PyArg_ParseTuple(args, "O!:remove", &Element_Type, &element))
        return NULL;

    if (!self->extra) {
        /* element has no children, so raise exception */
        PyErr_SetString(
            PyExc_ValueError,
            "list.remove(x): x not in list"
            );
        return NULL;
    }

    for (i = 0; i < self->extra->length; i++) {
        if (self->extra->children[i] == element)
            break;
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        if (PyObject_RichCompareBool(self->extra->children[i], element, Py_EQ) == 1)
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            break;
    }

    if (i == self->extra->length) {
        /* element is not in children, so raise exception */
        PyErr_SetString(
            PyExc_ValueError,
            "list.remove(x): x not in list"
            );
        return NULL;
    }

    Py_DECREF(self->extra->children[i]);

    self->extra->length--;

    for (; i < self->extra->length; i++)
        self->extra->children[i] = self->extra->children[i+1];

    Py_RETURN_NONE;
}

static PyObject*
element_repr(ElementObject* self)
{
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    return PyUnicode_FromFormat("<Element %R at %p>", self->tag, self);
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}

static PyObject*
element_set(ElementObject* self, PyObject* args)
{
    PyObject* attrib;

    PyObject* key;
    PyObject* value;
    if (!PyArg_ParseTuple(args, "OO:set", &key, &value))
        return NULL;

    if (!self->extra)
        element_new_extra(self, NULL);

    attrib = element_get_attrib(self);
    if (!attrib)
        return NULL;

    if (PyDict_SetItem(attrib, key, value) < 0)
        return NULL;

    Py_RETURN_NONE;
}

static int
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element_setitem(PyObject* self_, Py_ssize_t index, PyObject* item)
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{
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    ElementObject* self = (ElementObject*) self_;
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    int i;
    PyObject* old;

    if (!self->extra || index < 0 || index >= self->extra->length) {
        PyErr_SetString(
            PyExc_IndexError,
            "child assignment index out of range");
        return -1;
    }

    old = self->extra->children[index];

    if (item) {
        Py_INCREF(item);
        self->extra->children[index] = item;
    } else {
        self->extra->length--;
        for (i = index; i < self->extra->length; i++)
            self->extra->children[i] = self->extra->children[i+1];
    }

    Py_DECREF(old);

    return 0;
}

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static PyObject*
element_subscr(PyObject* self_, PyObject* item)
{
    ElementObject* self = (ElementObject*) self_;

#if (PY_VERSION_HEX < 0x02050000)
    if (PyInt_Check(item) || PyLong_Check(item)) {
        long i = PyInt_AsLong(item);
#else
    if (PyIndex_Check(item)) {
        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
#endif

        if (i == -1 && PyErr_Occurred()) {
            return NULL;
        }
        if (i < 0 && self->extra)
            i += self->extra->length;
        return element_getitem(self_, i);
    }
    else if (PySlice_Check(item)) {
        Py_ssize_t start, stop, step, slicelen, cur, i;
        PyObject* list;

        if (!self->extra)
            return PyList_New(0);

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        if (PySlice_GetIndicesEx(item,
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                self->extra->length,
                &start, &stop, &step, &slicelen) < 0) {
            return NULL;
        }

        if (slicelen <= 0)
            return PyList_New(0);
        else {
            list = PyList_New(slicelen);
            if (!list)
                return NULL;

            for (cur = start, i = 0; i < slicelen;
                 cur += step, i++) {
                PyObject* item = self->extra->children[cur];
                Py_INCREF(item);
                PyList_SET_ITEM(list, i, item);
            }

            return list;
        }
    }
    else {
        PyErr_SetString(PyExc_TypeError,
                "element indices must be integers");
        return NULL;
    }
}

static int
element_ass_subscr(PyObject* self_, PyObject* item, PyObject* value)
{
    ElementObject* self = (ElementObject*) self_;

#if (PY_VERSION_HEX < 0x02050000)
    if (PyInt_Check(item) || PyLong_Check(item)) {
        long i = PyInt_AsLong(item);
#else
    if (PyIndex_Check(item)) {
        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
#endif

        if (i == -1 && PyErr_Occurred()) {
            return -1;
        }
        if (i < 0 && self->extra)
            i += self->extra->length;
        return element_setitem(self_, i, value);
    }
    else if (PySlice_Check(item)) {
        Py_ssize_t start, stop, step, slicelen, newlen, cur, i;

        PyObject* recycle = NULL;
        PyObject* seq = NULL;

        if (!self->extra)
            element_new_extra(self, NULL);

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        if (PySlice_GetIndicesEx(item,
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                self->extra->length,
                &start, &stop, &step, &slicelen) < 0) {
            return -1;
        }

        if (value == NULL)
            newlen = 0;
        else {
            seq = PySequence_Fast(value, "");
            if (!seq) {
                PyErr_Format(
                    PyExc_TypeError,
                    "expected sequence, not \"%.200s\"", Py_TYPE(value)->tp_name
                    );
                return -1;
            }
            newlen = PySequence_Size(seq);
        }

        if (step !=  1 && newlen != slicelen)
        {
            PyErr_Format(PyExc_ValueError,
#if (PY_VERSION_HEX < 0x02050000)
                "attempt to assign sequence of size %d "
                "to extended slice of size %d",
#else
                "attempt to assign sequence of size %zd "
                "to extended slice of size %zd",
#endif
                newlen, slicelen
                );
            return -1;
        }


        /* Resize before creating the recycle bin, to prevent refleaks. */
        if (newlen > slicelen) {
            if (element_resize(self, newlen - slicelen) < 0) {
                if (seq) {
                    Py_DECREF(seq);
                }
                return -1;
            }
        }

        if (slicelen > 0) {
            /* to avoid recursive calls to this method (via decref), move
               old items to the recycle bin here, and get rid of them when
               we're done modifying the element */
            recycle = PyList_New(slicelen);
            if (!recycle) {
                if (seq) {
                    Py_DECREF(seq);
                }
                return -1;
            }
            for (cur = start, i = 0; i < slicelen;
                 cur += step, i++)
                PyList_SET_ITEM(recycle, i, self->extra->children[cur]);
        }

        if (newlen < slicelen) {
            /* delete slice */
            for (i = stop; i < self->extra->length; i++)
                self->extra->children[i + newlen - slicelen] = self->extra->children[i];
        } else if (newlen > slicelen) {
            /* insert slice */
            for (i = self->extra->length-1; i >= stop; i--)
                self->extra->children[i + newlen - slicelen] = self->extra->children[i];
        }

        /* replace the slice */
        for (cur = start, i = 0; i < newlen;
             cur += step, i++) {
            PyObject* element = PySequence_Fast_GET_ITEM(seq, i);
            Py_INCREF(element);
            self->extra->children[cur] = element;
        }

        self->extra->length += newlen - slicelen;

        if (seq) {
            Py_DECREF(seq);
        }

        /* discard the recycle bin, and everything in it */
        Py_XDECREF(recycle);

        return 0;
    }
    else {
        PyErr_SetString(PyExc_TypeError,
                "element indices must be integers");
        return -1;
    }
}

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static PyMethodDef element_methods[] = {

    {"clear", (PyCFunction) element_clear, METH_VARARGS},

    {"get", (PyCFunction) element_get, METH_VARARGS},
    {"set", (PyCFunction) element_set, METH_VARARGS},

    {"find", (PyCFunction) element_find, METH_VARARGS},
    {"findtext", (PyCFunction) element_findtext, METH_VARARGS},
    {"findall", (PyCFunction) element_findall, METH_VARARGS},

    {"append", (PyCFunction) element_append, METH_VARARGS},
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    {"extend", (PyCFunction) element_extend, METH_VARARGS},
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    {"insert", (PyCFunction) element_insert, METH_VARARGS},
    {"remove", (PyCFunction) element_remove, METH_VARARGS},

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    {"iter", (PyCFunction) element_iter, METH_VARARGS},
    {"itertext", (PyCFunction) element_itertext, METH_VARARGS},
    {"iterfind", (PyCFunction) element_iterfind, METH_VARARGS},

    {"getiterator", (PyCFunction) element_iter, METH_VARARGS},
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    {"getchildren", (PyCFunction) element_getchildren, METH_VARARGS},

    {"items", (PyCFunction) element_items, METH_VARARGS},
    {"keys", (PyCFunction) element_keys, METH_VARARGS},

    {"makeelement", (PyCFunction) element_makeelement, METH_VARARGS},

    {"__copy__", (PyCFunction) element_copy, METH_VARARGS},
    {"__deepcopy__", (PyCFunction) element_deepcopy, METH_VARARGS},

    /* Some 2.3 and 2.4 versions do not handle the __copy__ method on
       C objects correctly, so we have to fake it using a __reduce__-
       based hack (see the element_reduce implementation above for
       details). */

    /* The behaviour has been changed in 2.3.5 and 2.4.1, so we're
       using a runtime test to figure out if we need to fake things
       or now (see the init code below).  The following entry is
       enabled only if the hack is needed. */

    {"!__reduce__", (PyCFunction) element_reduce, METH_VARARGS},

    {NULL, NULL}
};

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static PyObject*
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element_getattro(ElementObject* self, PyObject* nameobj)
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{
    PyObject* res;
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    char *name = "";
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1494
    if (PyUnicode_Check(nameobj))
1495
        name = _PyUnicode_AsString(nameobj);
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    if (name == NULL)
        return NULL;
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    /* handle common attributes first */
    if (strcmp(name, "tag") == 0) {
        res = self->tag;
        Py_INCREF(res);
        return res;
    } else if (strcmp(name, "text") == 0) {
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        res = element_get_text(self);
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        Py_INCREF(res);
        return res;
    }

    /* methods */
    res = PyObject_GenericGetAttr((PyObject*) self, nameobj);
    if (res)
        return res;

    /* less common attributes */
    if (strcmp(name, "tail") == 0) {
        PyErr_Clear();
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        res = element_get_tail(self);
    } else if (strcmp(name, "attrib") == 0) {
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        PyErr_Clear();
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        if (!self->extra)
            element_new_extra(self, NULL);
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        res = element_get_attrib(self);
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    }

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    if (!res)
        return NULL;

    Py_INCREF(res);
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    return res;
}

static int
element_setattr(ElementObject* self, const char* name, PyObject* value)
{
    if (value == NULL) {
        PyErr_SetString(
            PyExc_AttributeError,
            "can't delete element attributes"
            );
        return -1;
    }

    if (strcmp(name, "tag") == 0) {
        Py_DECREF(self->tag);
        self->tag = value;
        Py_INCREF(self->tag);
    } else if (strcmp(name, "text") == 0) {
        Py_DECREF(JOIN_OBJ(self->text));
        self->text = value;
        Py_INCREF(self->text);
    } else if (strcmp(name, "tail") == 0) {
        Py_DECREF(JOIN_OBJ(self->tail));
        self->tail = value;
        Py_INCREF(self->tail);
    } else if (strcmp(name, "attrib") == 0) {
        if (!self->extra)
            element_new_extra(self, NULL);
        Py_DECREF(self->extra->attrib);
        self->extra->attrib = value;
        Py_INCREF(self->extra->attrib);
    } else {
        PyErr_SetString(PyExc_AttributeError, name);
        return -1;
    }

    return 0;
}

static PySequenceMethods element_as_sequence = {
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    (lenfunc) element_length,
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    0, /* sq_concat */
    0, /* sq_repeat */
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    element_getitem,
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    0,
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    element_setitem,
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    0,
};

static PyMappingMethods element_as_mapping = {
    (lenfunc) element_length,
    (binaryfunc) element_subscr,
    (objobjargproc) element_ass_subscr,
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};

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static PyTypeObject Element_Type = {
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    PyVarObject_HEAD_INIT(NULL, 0)
    "Element", sizeof(ElementObject), 0,
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    /* methods */
    (destructor)element_dealloc, /* tp_dealloc */
    0, /* tp_print */
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    0, /* tp_getattr */
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    (setattrfunc)element_setattr, /* tp_setattr */
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    0, /* tp_reserved */
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    (reprfunc)element_repr, /* tp_repr */
    0, /* tp_as_number */
    &element_as_sequence, /* tp_as_sequence */
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    &element_as_mapping, /* tp_as_mapping */
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    0, /* tp_hash */
    0, /* tp_call */
    0, /* tp_str */
    (getattrofunc)element_getattro, /* tp_getattro */
    0, /* tp_setattro */
    0, /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT, /* tp_flags */
    0, /* tp_doc */
    0, /* tp_traverse */
    0, /* tp_clear */
    0, /* tp_richcompare */
    0, /* tp_weaklistoffset */
    0, /* tp_iter */
    0, /* tp_iternext */
    element_methods, /* tp_methods */
    0, /* tp_members */
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};

/* ==================================================================== */
/* the tree builder type */

typedef struct {
    PyObject_HEAD

    PyObject* root; /* root node (first created node) */

    ElementObject* this; /* current node */
    ElementObject* last; /* most recently created node */

    PyObject* data; /* data collector (string or list), or NULL */

    PyObject* stack; /* element stack */
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    Py_ssize_t index; /* current stack size (0=empty) */
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    /* element tracing */
    PyObject* events; /* list of events, or NULL if not collecting */
    PyObject* start_event_obj; /* event objects (NULL to ignore) */
    PyObject* end_event_obj;
    PyObject* start_ns_event_obj;
    PyObject* end_ns_event_obj;

} TreeBuilderObject;

1643
static PyTypeObject TreeBuilder_Type;
1644

1645
#define TreeBuilder_CheckExact(op) (Py_TYPE(op) == &TreeBuilder_Type)
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/* -------------------------------------------------------------------- */
/* constructor and destructor */

LOCAL(PyObject*)
treebuilder_new(void)
{
    TreeBuilderObject* self;

    self = PyObject_New(TreeBuilderObject, &TreeBuilder_Type);
    if (self == NULL)
        return NULL;

    self->root = NULL;

    Py_INCREF(Py_None);
    self->this = (ElementObject*) Py_None;

    Py_INCREF(Py_None);
    self->last = (ElementObject*) Py_None;

    self->data = NULL;

    self->stack = PyList_New(20);
    self->index = 0;

    self->events = NULL;
    self->start_event_obj = self->end_event_obj = NULL;
    self->start_ns_event_obj = self->end_ns_event_obj = NULL;

    ALLOC(sizeof(TreeBuilderObject), "create treebuilder");

    return (PyObject*) self;
}

static PyObject*
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treebuilder(PyObject* self_, PyObject* args)
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{
    if (!PyArg_ParseTuple(args, ":TreeBuilder"))
        return NULL;

    return treebuilder_new();
}

static void
treebuilder_dealloc(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_XDECREF(self->root);

    RELEASE(sizeof(TreeBuilderObject), "destroy treebuilder");

    PyObject_Del(self);
}

/* -------------------------------------------------------------------- */
/* handlers */

LOCAL(PyObject*)
treebuilder_handle_xml(TreeBuilderObject* self, PyObject* encoding,
                       PyObject* standalone)
{
    Py_RETURN_NONE;
}

LOCAL(PyObject*)
treebuilder_handle_start(TreeBuilderObject* self, PyObject* tag,
                         PyObject* attrib)
{
    PyObject* node;
    PyObject* this;

    if (self->data) {
        if (self->this == self->last) {
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            Py_DECREF(JOIN_OBJ(self->last->text));
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            self->last->text = JOIN_SET(
                self->data, PyList_CheckExact(self->data)
                );
        } else {
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            Py_DECREF(JOIN_OBJ(self->last->tail));
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            self->last->tail = JOIN_SET(
                self->data, PyList_CheckExact(self->data)
                );
        }
        self->data = NULL;
    }

    node = element_new(tag, attrib);
    if (!node)
        return NULL;

    this = (PyObject*) self->this;

    if (this != Py_None) {
        if (element_add_subelement((ElementObject*) this, node) < 0)
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            goto error;
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    } else {
        if (self->root) {
            PyErr_SetString(
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                elementtree_parseerror_obj,
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                "multiple elements on top level"
                );
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            goto error;
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        }
        Py_INCREF(node);
        self->root = node;
    }

    if (self->index < PyList_GET_SIZE(self->stack)) {
        if (PyList_SetItem(self->stack, self->index, this) < 0)
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            goto error;
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        Py_INCREF(this);
    } else {
        if (PyList_Append(self->stack, this) < 0)
1768
            goto error;
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    }
    self->index++;

    Py_DECREF(this);
    Py_INCREF(node);
    self->this = (ElementObject*) node;

    Py_DECREF(self->last);
    Py_INCREF(node);
    self->last = (ElementObject*) node;

    if (self->start_event_obj) {
        PyObject* res;
        PyObject* action = self->start_event_obj;
        res = PyTuple_New(2);
        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
            PyErr_Clear(); /* FIXME: propagate error */
    }

    return node;
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  error:
    Py_DECREF(node);
    return NULL;
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}

LOCAL(PyObject*)
treebuilder_handle_data(TreeBuilderObject* self, PyObject* data)
{
    if (!self->data) {
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        if (self->last == (ElementObject*) Py_None) {
            /* ignore calls to data before the first call to start */
            Py_RETURN_NONE;
        }
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        /* store the first item as is */
        Py_INCREF(data); self->data = data;
    } else {
        /* more than one item; use a list to collect items */
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        if (PyBytes_CheckExact(self->data) && Py_REFCNT(self->data) == 1 &&
            PyBytes_CheckExact(data) && PyBytes_GET_SIZE(data) == 1) {
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            /* expat often generates single character data sections; handle
               the most common case by resizing the existing string... */
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            Py_ssize_t size = PyBytes_GET_SIZE(self->data);
            if (_PyBytes_Resize(&self->data, size + 1) < 0)
1818
                return NULL;
1819
            PyBytes_AS_STRING(self->data)[size] = PyBytes_AS_STRING(data)[0];
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        } else if (PyList_CheckExact(self->data)) {
            if (PyList_Append(self->data, data) < 0)
                return NULL;
        } else {
            PyObject* list = PyList_New(2);
            if (!list)
                return NULL;
            PyList_SET_ITEM(list, 0, self->data);
            Py_INCREF(data); PyList_SET_ITEM(list, 1, data);
            self->data = list;
        }
    }

    Py_RETURN_NONE;
}

LOCAL(PyObject*)
treebuilder_handle_end(TreeBuilderObject* self, PyObject* tag)
{
    PyObject* item;

    if (self->data) {
        if (self->this == self->last) {
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            Py_DECREF(JOIN_OBJ(self->last->text));
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            self->last->text = JOIN_SET(
                self->data, PyList_CheckExact(self->data)
                );
        } else {
1848
            Py_DECREF(JOIN_OBJ(self->last->tail));
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            self->last->tail = JOIN_SET(
                self->data, PyList_CheckExact(self->data)
                );
        }
        self->data = NULL;
    }

    if (self->index == 0) {
        PyErr_SetString(
            PyExc_IndexError,
            "pop from empty stack"
            );
        return NULL;
    }

    self->index--;

    item = PyList_GET_ITEM(self->stack, self->index);
    Py_INCREF(item);

    Py_DECREF(self->last);

    self->last = (ElementObject*) self->this;
    self->this = (ElementObject*) item;

    if (self->end_event_obj) {
        PyObject* res;
        PyObject* action = self->end_event_obj;
        PyObject* node = (PyObject*) self->last;
        res = PyTuple_New(2);
        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
            PyErr_Clear(); /* FIXME: propagate error */
    }

    Py_INCREF(self->last);
    return (PyObject*) self->last;
}

LOCAL(void)
treebuilder_handle_namespace(TreeBuilderObject* self, int start,
1894
                             PyObject *prefix, PyObject *uri)
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
{
    PyObject* res;
    PyObject* action;
    PyObject* parcel;

    if (!self->events)
        return;

    if (start) {
        if (!self->start_ns_event_obj)
            return;
        action = self->start_ns_event_obj;
1907
        parcel = Py_BuildValue("OO", prefix, uri);
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        if (!parcel)
            return;
        Py_INCREF(action);
    } else {
        if (!self->end_ns_event_obj)
            return;
        action = self->end_ns_event_obj;
        Py_INCREF(action);
        parcel = Py_None;
        Py_INCREF(parcel);
    }

    res = PyTuple_New(2);

    if (res) {
        PyTuple_SET_ITEM(res, 0, action);
        PyTuple_SET_ITEM(res, 1, parcel);
        PyList_Append(self->events, res);
        Py_DECREF(res);
    } else
        PyErr_Clear(); /* FIXME: propagate error */
}

/* -------------------------------------------------------------------- */
/* methods (in alphabetical order) */

static PyObject*
treebuilder_data(TreeBuilderObject* self, PyObject* args)
{
    PyObject* data;
    if (!PyArg_ParseTuple(args, "O:data", &data))
        return NULL;

    return treebuilder_handle_data(self, data);
}

static PyObject*
treebuilder_end(TreeBuilderObject* self, PyObject* args)
{
    PyObject* tag;
    if (!PyArg_ParseTuple(args, "O:end", &tag))
        return NULL;

    return treebuilder_handle_end(self, tag);
}

LOCAL(PyObject*)
treebuilder_done(TreeBuilderObject* self)
{
    PyObject* res;

    /* FIXME: check stack size? */

    if (self->root)
        res = self->root;
    else
        res = Py_None;

    Py_INCREF(res);
    return res;
}

static PyObject*
treebuilder_close(TreeBuilderObject* self, PyObject* args)
{
    if (!PyArg_ParseTuple(args, ":close"))
        return NULL;

    return treebuilder_done(self);
}

static PyObject*
treebuilder_start(TreeBuilderObject* self, PyObject* args)
{
    PyObject* tag;
    PyObject* attrib = Py_None;
    if (!PyArg_ParseTuple(args, "O|O:start", &tag, &attrib))
        return NULL;

    return treebuilder_handle_start(self, tag, attrib);
}

static PyObject*
treebuilder_xml(TreeBuilderObject* self, PyObject* args)
{
    PyObject* encoding;
    PyObject* standalone;
    if (!PyArg_ParseTuple(args, "OO:xml", &encoding, &standalone))
        return NULL;

    return treebuilder_handle_xml(self, encoding, standalone);
}

static PyMethodDef treebuilder_methods[] = {
    {"data", (PyCFunction) treebuilder_data, METH_VARARGS},
    {"start", (PyCFunction) treebuilder_start, METH_VARARGS},
    {"end", (PyCFunction) treebuilder_end, METH_VARARGS},
    {"xml", (PyCFunction) treebuilder_xml, METH_VARARGS},
    {"close", (PyCFunction) treebuilder_close, METH_VARARGS},
    {NULL, NULL}
};

2010
static PyTypeObject TreeBuilder_Type = {
2011 2012
    PyVarObject_HEAD_INIT(NULL, 0)
    "TreeBuilder", sizeof(TreeBuilderObject), 0,
2013 2014 2015
    /* methods */
    (destructor)treebuilder_dealloc, /* tp_dealloc */
    0, /* tp_print */
2016 2017
    0, /* tp_getattr */
    0, /* tp_setattr */
2018
    0, /* tp_reserved */
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
    0, /* tp_repr */
    0, /* tp_as_number */
    0, /* tp_as_sequence */
    0, /* tp_as_mapping */
    0, /* tp_hash */
    0, /* tp_call */
    0, /* tp_str */
    0, /* tp_getattro */
    0, /* tp_setattro */
    0, /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT, /* tp_flags */
    0, /* tp_doc */
    0, /* tp_traverse */
    0, /* tp_clear */
    0, /* tp_richcompare */
    0, /* tp_weaklistoffset */
    0, /* tp_iter */
    0, /* tp_iternext */
    treebuilder_methods, /* tp_methods */
    0, /* tp_members */
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};

/* ==================================================================== */
/* the expat interface */

#if defined(USE_EXPAT)

#include "expat.h"

#if defined(USE_PYEXPAT_CAPI)
#include "pyexpat.h"
static struct PyExpat_CAPI* expat_capi;
#define EXPAT(func) (expat_capi->func)
#else
#define EXPAT(func) (XML_##func)
#endif

typedef struct {
    PyObject_HEAD

    XML_Parser parser;

    PyObject* target;
    PyObject* entity;

    PyObject* names;

    PyObject* handle_xml;
2067

2068 2069 2070 2071 2072 2073 2074
    PyObject* handle_start;
    PyObject* handle_data;
    PyObject* handle_end;

    PyObject* handle_comment;
    PyObject* handle_pi;

2075 2076
    PyObject* handle_close;

2077 2078
} XMLParserObject;

2079
static PyTypeObject XMLParser_Type;
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093

/* helpers */

LOCAL(PyObject*)
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);
    PyObject* key;
    PyObject* value;

    /* look the 'raw' name up in the names dictionary */
2094
    key = PyBytes_FromStringAndSize(string, size);
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    if (!key)
        return NULL;

    value = PyDict_GetItem(self->names, key);

    if (value) {
        Py_INCREF(value);
    } else {
        /* new name.  convert to universal name, and decode as
           necessary */

        PyObject* tag;
        char* p;
        int i;

        /* look for namespace separator */
        for (i = 0; i < size; i++)
            if (string[i] == '}')
                break;
        if (i != size) {
            /* convert to universal name */
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            tag = PyBytes_FromStringAndSize(NULL, size+1);
            p = PyBytes_AS_STRING(tag);
2118 2119 2120 2121 2122 2123 2124 2125
            p[0] = '{';
            memcpy(p+1, string, size);
            size++;
        } else {
            /* plain name; use key as tag */
            Py_INCREF(key);
            tag = key;
        }
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2127
        /* decode universal name */
2128
        p = PyBytes_AS_STRING(tag);
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        value = PyUnicode_DecodeUTF8(p, size, "strict");
        Py_DECREF(tag);
        if (!value) {
            Py_DECREF(key);
            return NULL;
        }
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        /* add to names dictionary */
        if (PyDict_SetItem(self->names, key, value) < 0) {
            Py_DECREF(key);
            Py_DECREF(value);
            return NULL;
        }
    }

    Py_DECREF(key);
    return value;
}

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static void
expat_set_error(const char* message, int line, int column)
{
2151
    PyObject *errmsg, *error, *position;
2152

2153 2154 2155 2156
    errmsg = PyUnicode_FromFormat("%s: line %d, column %d",
                                  message, line, column);
    if (errmsg == NULL)
        return;
2157

2158 2159
    error = PyObject_CallFunction(elementtree_parseerror_obj, "O", errmsg);
    Py_DECREF(errmsg);
2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
    if (!error)
        return;

    /* add position attribute */
    position = Py_BuildValue("(ii)", line, column);
    if (!position) {
        Py_DECREF(error);
        return;
    }
    if (PyObject_SetAttrString(error, "position", position) == -1) {
        Py_DECREF(error);
        Py_DECREF(position);
        return;
    }
    Py_DECREF(position);

    PyErr_SetObject(elementtree_parseerror_obj, error);
    Py_DECREF(error);
}

2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
/* -------------------------------------------------------------------- */
/* handlers */

static void
expat_default_handler(XMLParserObject* self, const XML_Char* data_in,
                      int data_len)
{
    PyObject* key;
    PyObject* value;
    PyObject* res;

    if (data_len < 2 || data_in[0] != '&')
        return;

2194
    key = PyUnicode_DecodeUTF8(data_in + 1, data_len - 2, "strict");
2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
    if (!key)
        return;

    value = PyDict_GetItem(self->entity, key);

    if (value) {
        if (TreeBuilder_CheckExact(self->target))
            res = treebuilder_handle_data(
                (TreeBuilderObject*) self->target, value
                );
        else if (self->handle_data)
            res = PyObject_CallFunction(self->handle_data, "O", value);
        else
            res = NULL;
        Py_XDECREF(res);
2210 2211
    } else if (!PyErr_Occurred()) {
        /* Report the first error, not the last */
2212 2213
        char message[128] = "undefined entity ";
        strncat(message, data_in, data_len < 100?data_len:100);
2214 2215
        expat_set_error(
            message,
2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244
            EXPAT(GetErrorLineNumber)(self->parser),
            EXPAT(GetErrorColumnNumber)(self->parser)
            );
    }

    Py_DECREF(key);
}

static void
expat_start_handler(XMLParserObject* self, const XML_Char* tag_in,
                    const XML_Char **attrib_in)
{
    PyObject* res;
    PyObject* tag;
    PyObject* attrib;
    int ok;

    /* tag name */
    tag = makeuniversal(self, tag_in);
    if (!tag)
        return; /* parser will look for errors */

    /* attributes */
    if (attrib_in[0]) {
        attrib = PyDict_New();
        if (!attrib)
            return;
        while (attrib_in[0] && attrib_in[1]) {
            PyObject* key = makeuniversal(self, attrib_in[0]);
2245
            PyObject* value = PyUnicode_DecodeUTF8(attrib_in[1], strlen(attrib_in[1]), "strict");
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            if (!key || !value) {
                Py_XDECREF(value);
                Py_XDECREF(key);
                Py_DECREF(attrib);
                return;
            }
            ok = PyDict_SetItem(attrib, key, value);
            Py_DECREF(value);
            Py_DECREF(key);
            if (ok < 0) {
                Py_DECREF(attrib);
                return;
            }
            attrib_in += 2;
        }
    } else {
        Py_INCREF(Py_None);
        attrib = Py_None;
    }

    if (TreeBuilder_CheckExact(self->target))
        /* shortcut */
        res = treebuilder_handle_start((TreeBuilderObject*) self->target,
                                       tag, attrib);
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    else if (self->handle_start) {
        if (attrib == Py_None) {
            Py_DECREF(attrib);
            attrib = PyDict_New();
            if (!attrib)
                return;
        }
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        res = PyObject_CallFunction(self->handle_start, "OO", tag, attrib);
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    } else
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        res = NULL;

    Py_DECREF(tag);
    Py_DECREF(attrib);

    Py_XDECREF(res);
}

static void
expat_data_handler(XMLParserObject* self, const XML_Char* data_in,
                   int data_len)
{
    PyObject* data;
    PyObject* res;

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    data = PyUnicode_DecodeUTF8(data_in, data_len, "strict");
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    if (!data)
        return; /* parser will look for errors */
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    if (TreeBuilder_CheckExact(self->target))
        /* shortcut */
        res = treebuilder_handle_data((TreeBuilderObject*) self->target, data);
    else if (self->handle_data)
        res = PyObject_CallFunction(self->handle_data, "O", data);
    else
        res = NULL;

    Py_DECREF(data);

    Py_XDECREF(res);
}

static void
expat_end_handler(XMLParserObject* self, const XML_Char* tag_in)
{
    PyObject* tag;
    PyObject* res = NULL;

    if (TreeBuilder_CheckExact(self->target))
        /* shortcut */
        /* the standard tree builder doesn't look at the end tag */
        res = treebuilder_handle_end(
            (TreeBuilderObject*) self->target, Py_None
            );
    else if (self->handle_end) {
        tag = makeuniversal(self, tag_in);
        if (tag) {
            res = PyObject_CallFunction(self->handle_end, "O", tag);
            Py_DECREF(tag);
        }
    }

    Py_XDECREF(res);
}

static void
expat_start_ns_handler(XMLParserObject* self, const XML_Char* prefix,
                       const XML_Char *uri)
{
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    PyObject* sprefix = NULL;
    PyObject* suri = NULL;

    suri = PyUnicode_DecodeUTF8(uri, strlen(uri), "strict");
    if (!suri)
        return;

    if (prefix)
        sprefix = PyUnicode_DecodeUTF8(prefix, strlen(prefix), "strict");
    else
        sprefix = PyUnicode_FromString("");
    if (!sprefix) {
        Py_DECREF(suri);
        return;
    }

2354
    treebuilder_handle_namespace(
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        (TreeBuilderObject*) self->target, 1, sprefix, suri
2356
        );
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    Py_DECREF(sprefix);
    Py_DECREF(suri);
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}

static void
expat_end_ns_handler(XMLParserObject* self, const XML_Char* prefix_in)
{
    treebuilder_handle_namespace(
        (TreeBuilderObject*) self->target, 0, NULL, NULL
        );
}

static void
expat_comment_handler(XMLParserObject* self, const XML_Char* comment_in)
{
    PyObject* comment;
    PyObject* res;

    if (self->handle_comment) {
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        comment = PyUnicode_DecodeUTF8(comment_in, strlen(comment_in), "strict");
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        if (comment) {
            res = PyObject_CallFunction(self->handle_comment, "O", comment);
            Py_XDECREF(res);
            Py_DECREF(comment);
        }
    }
}

static void
expat_pi_handler(XMLParserObject* self, const XML_Char* target_in,
                 const XML_Char* data_in)
{
    PyObject* target;
    PyObject* data;
    PyObject* res;

    if (self->handle_pi) {
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        target = PyUnicode_DecodeUTF8(target_in, strlen(target_in), "strict");
        data = PyUnicode_DecodeUTF8(data_in, strlen(data_in), "strict");
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        if (target && data) {
            res = PyObject_CallFunction(self->handle_pi, "OO", target, data);
            Py_XDECREF(res);
            Py_DECREF(data);
            Py_DECREF(target);
        } else {
            Py_XDECREF(data);
            Py_XDECREF(target);
        }
    }
}

static int
expat_unknown_encoding_handler(XMLParserObject *self, const XML_Char *name,
                               XML_Encoding *info)
{
    PyObject* u;
    unsigned char s[256];
    int i;
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    void *data;
    unsigned int kind;
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    memset(info, 0, sizeof(XML_Encoding));

    for (i = 0; i < 256; i++)
        s[i] = i;
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    u = PyUnicode_Decode((char*) s, 256, name, "replace");
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    if (!u)
        return XML_STATUS_ERROR;
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    if (PyUnicode_READY(u))
        return XML_STATUS_ERROR;
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    if (PyUnicode_GET_LENGTH(u) != 256) {
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        Py_DECREF(u);
        return XML_STATUS_ERROR;
    }

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    kind = PyUnicode_KIND(u);
    data = PyUnicode_DATA(u);
2437
    for (i = 0; i < 256; i++) {
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        Py_UCS4 ch = PyUnicode_READ(kind, data, i);
        if (ch != Py_UNICODE_REPLACEMENT_CHARACTER)
            info->map[i] = ch;
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        else
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            info->map[i] = -1;
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    }

    Py_DECREF(u);

    return XML_STATUS_OK;
}

/* -------------------------------------------------------------------- */
/* constructor and destructor */

static PyObject*
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xmlparser(PyObject* self_, PyObject* args, PyObject* kw)
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{
    XMLParserObject* self;
    /* FIXME: does this need to be static? */
    static XML_Memory_Handling_Suite memory_handler;

    PyObject* target = NULL;
    char* encoding = NULL;
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    static char* kwlist[] = { "target", "encoding", NULL };
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    if (!PyArg_ParseTupleAndKeywords(args, kw, "|Oz:XMLParser", kwlist,
                                     &target, &encoding))
        return NULL;

#if defined(USE_PYEXPAT_CAPI)
    if (!expat_capi) {
        PyErr_SetString(
            PyExc_RuntimeError, "cannot load dispatch table from pyexpat"
            );
        return NULL;
    }
#endif

    self = PyObject_New(XMLParserObject, &XMLParser_Type);
    if (self == NULL)
        return NULL;

    self->entity = PyDict_New();
    if (!self->entity) {
        PyObject_Del(self);
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        return NULL;
2484
    }
2485

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    self->names = PyDict_New();
    if (!self->names) {
2488
        PyObject_Del(self->entity);
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        PyObject_Del(self);
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        return NULL;
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    }

    memory_handler.malloc_fcn = PyObject_Malloc;
    memory_handler.realloc_fcn = PyObject_Realloc;
    memory_handler.free_fcn = PyObject_Free;

    self->parser = EXPAT(ParserCreate_MM)(encoding, &memory_handler, "}");
    if (!self->parser) {
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        PyObject_Del(self->names);
        PyObject_Del(self->entity);
        PyObject_Del(self);
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        PyErr_NoMemory();
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        return NULL;
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    }

    /* setup target handlers */
    if (!target) {
        target = treebuilder_new();
        if (!target) {
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            EXPAT(ParserFree)(self->parser);
            PyObject_Del(self->names);
            PyObject_Del(self->entity);
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            PyObject_Del(self);
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            return NULL;
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        }
    } else
        Py_INCREF(target);
    self->target = target;

    self->handle_xml = PyObject_GetAttrString(target, "xml");
    self->handle_start = PyObject_GetAttrString(target, "start");
    self->handle_data = PyObject_GetAttrString(target, "data");
    self->handle_end = PyObject_GetAttrString(target, "end");
    self->handle_comment = PyObject_GetAttrString(target, "comment");
    self->handle_pi = PyObject_GetAttrString(target, "pi");
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    self->handle_close = PyObject_GetAttrString(target, "close");
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    PyErr_Clear();

    /* configure parser */
    EXPAT(SetUserData)(self->parser, self);
    EXPAT(SetElementHandler)(
        self->parser,
        (XML_StartElementHandler) expat_start_handler,
        (XML_EndElementHandler) expat_end_handler
        );
    EXPAT(SetDefaultHandlerExpand)(
        self->parser,
        (XML_DefaultHandler) expat_default_handler
        );
    EXPAT(SetCharacterDataHandler)(
        self->parser,
        (XML_CharacterDataHandler) expat_data_handler
        );
    if (self->handle_comment)
        EXPAT(SetCommentHandler)(
            self->parser,
            (XML_CommentHandler) expat_comment_handler
            );
    if (self->handle_pi)
        EXPAT(SetProcessingInstructionHandler)(
            self->parser,
            (XML_ProcessingInstructionHandler) expat_pi_handler
            );
    EXPAT(SetUnknownEncodingHandler)(
        self->parser,
        (XML_UnknownEncodingHandler) expat_unknown_encoding_handler, NULL
        );

    ALLOC(sizeof(XMLParserObject), "create expatparser");

    return (PyObject*) self;
}

static void
xmlparser_dealloc(XMLParserObject* self)
{
    EXPAT(ParserFree)(self->parser);

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    Py_XDECREF(self->handle_close);
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    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_xml);

    Py_DECREF(self->target);
    Py_DECREF(self->entity);
    Py_DECREF(self->names);

    RELEASE(sizeof(XMLParserObject), "destroy expatparser");

    PyObject_Del(self);
}

/* -------------------------------------------------------------------- */
/* methods (in alphabetical order) */

LOCAL(PyObject*)
expat_parse(XMLParserObject* self, char* data, int data_len, int final)
{
    int ok;

    ok = EXPAT(Parse)(self->parser, data, data_len, final);

    if (PyErr_Occurred())
        return NULL;

    if (!ok) {
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        expat_set_error(
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            EXPAT(ErrorString)(EXPAT(GetErrorCode)(self->parser)),
            EXPAT(GetErrorLineNumber)(self->parser),
            EXPAT(GetErrorColumnNumber)(self->parser)
            );
        return NULL;
    }

    Py_RETURN_NONE;
}

static PyObject*
xmlparser_close(XMLParserObject* self, PyObject* args)
{
    /* end feeding data to parser */

    PyObject* res;
    if (!PyArg_ParseTuple(args, ":close"))
        return NULL;

    res = expat_parse(self, "", 0, 1);
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    if (!res)
        return NULL;
2624

2625
    if (TreeBuilder_CheckExact(self->target)) {
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        Py_DECREF(res);
        return treebuilder_done((TreeBuilderObject*) self->target);
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    } if (self->handle_close) {
        Py_DECREF(res);
        return PyObject_CallFunction(self->handle_close, "");
    } else
        return res;
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}

static PyObject*
xmlparser_feed(XMLParserObject* self, PyObject* args)
{
    /* feed data to parser */

    char* data;
    int data_len;
    if (!PyArg_ParseTuple(args, "s#:feed", &data, &data_len))
        return NULL;

    return expat_parse(self, data, data_len, 0);
}

static PyObject*
xmlparser_parse(XMLParserObject* self, PyObject* args)
{
    /* (internal) parse until end of input stream */

    PyObject* reader;
    PyObject* buffer;
    PyObject* res;

    PyObject* fileobj;
    if (!PyArg_ParseTuple(args, "O:_parse", &fileobj))
        return NULL;

    reader = PyObject_GetAttrString(fileobj, "read");
    if (!reader)
        return NULL;
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2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675
    /* read from open file object */
    for (;;) {

        buffer = PyObject_CallFunction(reader, "i", 64*1024);

        if (!buffer) {
            /* read failed (e.g. due to KeyboardInterrupt) */
            Py_DECREF(reader);
            return NULL;
        }

2676
        if (!PyBytes_CheckExact(buffer) || PyBytes_GET_SIZE(buffer) == 0) {
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            Py_DECREF(buffer);
            break;
        }

        res = expat_parse(
2682
            self, PyBytes_AS_STRING(buffer), PyBytes_GET_SIZE(buffer), 0
2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711
            );

        Py_DECREF(buffer);

        if (!res) {
            Py_DECREF(reader);
            return NULL;
        }
        Py_DECREF(res);

    }

    Py_DECREF(reader);

    res = expat_parse(self, "", 0, 1);

    if (res && TreeBuilder_CheckExact(self->target)) {
        Py_DECREF(res);
        return treebuilder_done((TreeBuilderObject*) self->target);
    }

    return res;
}

static PyObject*
xmlparser_setevents(XMLParserObject* self, PyObject* args)
{
    /* activate element event reporting */

2712
    Py_ssize_t i;
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    TreeBuilderObject* target;

    PyObject* events; /* event collector */
    PyObject* event_set = Py_None;
    if (!PyArg_ParseTuple(args, "O!|O:_setevents",  &PyList_Type, &events,
                          &event_set))
        return NULL;

    if (!TreeBuilder_CheckExact(self->target)) {
        PyErr_SetString(
            PyExc_TypeError,
            "event handling only supported for cElementTree.Treebuilder "
            "targets"
            );
        return NULL;
    }

    target = (TreeBuilderObject*) self->target;

    Py_INCREF(events);
    Py_XDECREF(target->events);
    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;

    if (event_set == Py_None) {
        /* default is "end" only */
2744
        target->end_event_obj = PyUnicode_FromString("end");
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        Py_RETURN_NONE;
    }

    if (!PyTuple_Check(event_set)) /* FIXME: handle arbitrary sequences */
        goto error;

    for (i = 0; i < PyTuple_GET_SIZE(event_set); i++) {
        PyObject* item = PyTuple_GET_ITEM(event_set, i);
        char* event;
2754 2755
        if (PyUnicode_Check(item)) {
            event = _PyUnicode_AsString(item);
2756 2757
            if (event == NULL)
                goto error;
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        } else if (PyBytes_Check(item))
            event = PyBytes_AS_STRING(item);
        else {
2761
            goto error;
2762
        }
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        if (strcmp(event, "start") == 0) {
            Py_INCREF(item);
            target->start_event_obj = item;
        } else if (strcmp(event, "end") == 0) {
            Py_INCREF(item);
            Py_XDECREF(target->end_event_obj);
            target->end_event_obj = item;
        } else if (strcmp(event, "start-ns") == 0) {
            Py_INCREF(item);
            Py_XDECREF(target->start_ns_event_obj);
            target->start_ns_event_obj = item;
            EXPAT(SetNamespaceDeclHandler)(
                self->parser,
                (XML_StartNamespaceDeclHandler) expat_start_ns_handler,
                (XML_EndNamespaceDeclHandler) expat_end_ns_handler
                );
        } else if (strcmp(event, "end-ns") == 0) {
            Py_INCREF(item);
            Py_XDECREF(target->end_ns_event_obj);
            target->end_ns_event_obj = item;
            EXPAT(SetNamespaceDeclHandler)(
                self->parser,
                (XML_StartNamespaceDeclHandler) expat_start_ns_handler,
                (XML_EndNamespaceDeclHandler) expat_end_ns_handler
                );
        } else {
            PyErr_Format(
                PyExc_ValueError,
                "unknown event '%s'", event
                );
            return NULL;
        }
    }

    Py_RETURN_NONE;

  error:
    PyErr_SetString(
        PyExc_TypeError,
        "invalid event tuple"
        );
    return NULL;
}

static PyMethodDef xmlparser_methods[] = {
    {"feed", (PyCFunction) xmlparser_feed, METH_VARARGS},
    {"close", (PyCFunction) xmlparser_close, METH_VARARGS},
    {"_parse", (PyCFunction) xmlparser_parse, METH_VARARGS},
    {"_setevents", (PyCFunction) xmlparser_setevents, METH_VARARGS},
    {NULL, NULL}
};

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static PyObject*
2816
xmlparser_getattro(XMLParserObject* self, PyObject* nameobj)
2817
{
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    if (PyUnicode_Check(nameobj)) {
        PyObject* res;
        if (PyUnicode_CompareWithASCIIString(nameobj, "entity") == 0)
            res = self->entity;
        else if (PyUnicode_CompareWithASCIIString(nameobj, "target") == 0)
            res = self->target;
        else if (PyUnicode_CompareWithASCIIString(nameobj, "version") == 0) {
            return PyUnicode_FromFormat(
                "Expat %d.%d.%d", XML_MAJOR_VERSION,
2827
                XML_MINOR_VERSION, XML_MICRO_VERSION);
2828 2829 2830
        }
        else
            goto generic;
2831

2832 2833 2834 2835 2836
        Py_INCREF(res);
        return res;
    }
  generic:
    return PyObject_GenericGetAttr((PyObject*) self, nameobj);
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}

2839
static PyTypeObject XMLParser_Type = {
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    PyVarObject_HEAD_INIT(NULL, 0)
    "XMLParser", sizeof(XMLParserObject), 0,
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    /* methods */
    (destructor)xmlparser_dealloc, /* tp_dealloc */
    0, /* tp_print */
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    0, /* tp_getattr */
    0, /* tp_setattr */
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    0, /* tp_reserved */
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    0, /* tp_repr */
    0, /* tp_as_number */
    0, /* tp_as_sequence */
    0, /* tp_as_mapping */
    0, /* tp_hash */
    0, /* tp_call */
    0, /* tp_str */
    (getattrofunc)xmlparser_getattro, /* tp_getattro */
    0, /* tp_setattro */
    0, /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT, /* tp_flags */
    0, /* tp_doc */
    0, /* tp_traverse */
    0, /* tp_clear */
    0, /* tp_richcompare */
    0, /* tp_weaklistoffset */
    0, /* tp_iter */
    0, /* tp_iternext */
    xmlparser_methods, /* tp_methods */
    0, /* tp_members */
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};

#endif

/* ==================================================================== */
/* python module interface */

static PyMethodDef _functions[] = {
    {"Element", (PyCFunction) element, METH_VARARGS|METH_KEYWORDS},
    {"SubElement", (PyCFunction) subelement, METH_VARARGS|METH_KEYWORDS},
    {"TreeBuilder", (PyCFunction) treebuilder, METH_VARARGS},
#if defined(USE_EXPAT)
    {"XMLParser", (PyCFunction) xmlparser, METH_VARARGS|METH_KEYWORDS},
    {"XMLTreeBuilder", (PyCFunction) xmlparser, METH_VARARGS|METH_KEYWORDS},
#endif
    {NULL, NULL}
};

2886 2887

static struct PyModuleDef _elementtreemodule = {
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        PyModuleDef_HEAD_INIT,
        "_elementtree",
        NULL,
        -1,
        _functions,
        NULL,
        NULL,
        NULL,
        NULL
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};

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PyMODINIT_FUNC
2900
PyInit__elementtree(void)
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{
    PyObject* m;
    PyObject* g;
    char* bootstrap;

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    /* Initialize object types */
    if (PyType_Ready(&TreeBuilder_Type) < 0)
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        return NULL;
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    if (PyType_Ready(&Element_Type) < 0)
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        return NULL;
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#if defined(USE_EXPAT)
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    if (PyType_Ready(&XMLParser_Type) < 0)
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        return NULL;
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#endif

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    m = PyModule_Create(&_elementtreemodule);
2917
    if (!m)
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        return NULL;

    /* The code below requires that the module gets already added
       to sys.modules. */
    PyDict_SetItemString(PyImport_GetModuleDict(),
2923 2924
                         _elementtreemodule.m_name,
                         m);
2925 2926 2927 2928

    /* python glue code */

    g = PyDict_New();
2929
    if (!g)
2930
        return NULL;
2931 2932 2933 2934 2935 2936 2937 2938

    PyDict_SetItemString(g, "__builtins__", PyEval_GetBuiltins());

    bootstrap = (

        "from copy import copy, deepcopy\n"

        "try:\n"
2939
        "  from xml.etree import ElementTree\n"
2940 2941 2942 2943 2944
        "except ImportError:\n"
        "  import ElementTree\n"
        "ET = ElementTree\n"
        "del ElementTree\n"

2945
        "import _elementtree as cElementTree\n"
2946 2947 2948 2949 2950 2951 2952

        "try:\n" /* check if copy works as is */
        "  copy(cElementTree.Element('x'))\n"
        "except:\n"
        "  def copyelement(elem):\n"
        "    return elem\n"

2953 2954
        "class CommentProxy:\n"
        " def __call__(self, text=None):\n"
2955 2956 2957
        "  element = cElementTree.Element(ET.Comment)\n"
        "  element.text = text\n"
        "  return element\n"
2958 2959 2960
        " def __eq__(self, other):\n"
        "  return ET.Comment == other\n"
        "cElementTree.Comment = CommentProxy()\n"
2961 2962 2963

        "class ElementTree(ET.ElementTree):\n" /* public */
        "  def parse(self, source, parser=None):\n"
2964
        "    close_source = False\n"
2965 2966
        "    if not hasattr(source, 'read'):\n"
        "      source = open(source, 'rb')\n"
2967 2968 2969 2970 2971 2972 2973 2974 2975
        "      close_source = True\n"
        "    try:\n"
        "      if parser is not None:\n"
        "        while 1:\n"
        "          data = source.read(65536)\n"
        "          if not data:\n"
        "            break\n"
        "          parser.feed(data)\n"
        "        self._root = parser.close()\n"
2976
        "      else:\n"
2977 2978 2979 2980 2981 2982
        "        parser = cElementTree.XMLParser()\n"
        "        self._root = parser._parse(source)\n"
        "      return self._root\n"
        "    finally:\n"
        "      if close_source:\n"
        "        source.close()\n"
2983 2984
        "cElementTree.ElementTree = ElementTree\n"

2985
        "def iter(node, tag=None):\n" /* helper */
2986 2987 2988 2989 2990
        "  if tag == '*':\n"
        "    tag = None\n"
        "  if tag is None or node.tag == tag:\n"
        "    yield node\n"
        "  for node in node:\n"
2991
        "    for node in iter(node, tag):\n"
2992
        "      yield node\n"
2993 2994 2995 2996 2997 2998 2999 3000 3001

        "def itertext(node):\n" /* helper */
        "  if node.text:\n"
        "    yield node.text\n"
        "  for e in node:\n"
        "    for s in e.itertext():\n"
        "      yield s\n"
        "    if e.tail:\n"
        "      yield e.tail\n"
3002 3003 3004 3005 3006 3007 3008

        "def parse(source, parser=None):\n" /* public */
        "  tree = ElementTree()\n"
        "  tree.parse(source, parser)\n"
        "  return tree\n"
        "cElementTree.parse = parse\n"

3009
        "class iterparse:\n"
3010 3011
        " root = None\n"
        " def __init__(self, file, events=None):\n"
3012
        "  self._close_file = False\n"
3013 3014
        "  if not hasattr(file, 'read'):\n"
        "    file = open(file, 'rb')\n"
3015
        "    self._close_file = True\n"
3016
        "  self._file = file\n"
3017 3018 3019
        "  self._events = []\n"
        "  self._index = 0\n"
        "  self.root = self._root = None\n"
3020
        "  b = cElementTree.TreeBuilder()\n"
3021 3022 3023
        "  self._parser = cElementTree.XMLParser(b)\n"
        "  self._parser._setevents(self._events, events)\n"
        " def __next__(self):\n"
3024
        "  while 1:\n"
3025 3026 3027 3028 3029
        "    try:\n"
        "      item = self._events[self._index]\n"
        "    except IndexError:\n"
        "      if self._parser is None:\n"
        "        self.root = self._root\n"
3030 3031
        "        if self._close_file:\n"
        "          self._file.close()\n"
3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046
        "        raise StopIteration\n"
        "      # load event buffer\n"
        "      del self._events[:]\n"
        "      self._index = 0\n"
        "      data = self._file.read(16384)\n"
        "      if data:\n"
        "        self._parser.feed(data)\n"
        "      else:\n"
        "        self._root = self._parser.close()\n"
        "        self._parser = None\n"
        "    else:\n"
        "      self._index = self._index + 1\n"
        "      return item\n"
        " def __iter__(self):\n"
        "  return self\n"
3047 3048
        "cElementTree.iterparse = iterparse\n"

3049 3050 3051
        "class PIProxy:\n"
        " def __call__(self, target, text=None):\n"
        "  element = cElementTree.Element(ET.PI)\n"
3052 3053 3054 3055
        "  element.text = target\n"
        "  if text:\n"
        "    element.text = element.text + ' ' + text\n"
        "  return element\n"
3056 3057 3058
        " def __eq__(self, other):\n"
        "  return ET.PI == other\n"
        "cElementTree.PI = cElementTree.ProcessingInstruction = PIProxy()\n"
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068

        "def XML(text):\n" /* public */
        "  parser = cElementTree.XMLParser()\n"
        "  parser.feed(text)\n"
        "  return parser.close()\n"
        "cElementTree.XML = cElementTree.fromstring = XML\n"

        "def XMLID(text):\n" /* public */
        "  tree = XML(text)\n"
        "  ids = {}\n"
3069
        "  for elem in tree.iter():\n"
3070 3071 3072 3073 3074 3075
        "    id = elem.get('id')\n"
        "    if id:\n"
        "      ids[id] = elem\n"
        "  return tree, ids\n"
        "cElementTree.XMLID = XMLID\n"

3076 3077 3078 3079 3080 3081 3082
        "try:\n"
        " register_namespace = ET.register_namespace\n"
        "except AttributeError:\n"
        " def register_namespace(prefix, uri):\n"
        "  ET._namespace_map[uri] = prefix\n"
        "cElementTree.register_namespace = register_namespace\n"

3083 3084 3085 3086 3087
        "cElementTree.dump = ET.dump\n"
        "cElementTree.ElementPath = ElementPath = ET.ElementPath\n"
        "cElementTree.iselement = ET.iselement\n"
        "cElementTree.QName = ET.QName\n"
        "cElementTree.tostring = ET.tostring\n"
3088 3089
        "cElementTree.fromstringlist = ET.fromstringlist\n"
        "cElementTree.tostringlist = ET.tostringlist\n"
3090 3091 3092 3093 3094
        "cElementTree.VERSION = '" VERSION "'\n"
        "cElementTree.__version__ = '" VERSION "'\n"

       );

3095 3096
    if (!PyRun_String(bootstrap, Py_file_input, g, NULL))
        return NULL;
3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110

    elementpath_obj = PyDict_GetItemString(g, "ElementPath");

    elementtree_copyelement_obj = PyDict_GetItemString(g, "copyelement");
    if (elementtree_copyelement_obj) {
        /* reduce hack needed; enable reduce method */
        PyMethodDef* mp;
        for (mp = element_methods; mp->ml_name; mp++)
            if (mp->ml_meth == (PyCFunction) element_reduce) {
                mp->ml_name = "__reduce__";
                break;
            }
    } else
        PyErr_Clear();
3111

3112
    elementtree_deepcopy_obj = PyDict_GetItemString(g, "deepcopy");
3113 3114
    elementtree_iter_obj = PyDict_GetItemString(g, "iter");
    elementtree_itertext_obj = PyDict_GetItemString(g, "itertext");
3115 3116 3117

#if defined(USE_PYEXPAT_CAPI)
    /* link against pyexpat, if possible */
3118 3119 3120 3121 3122 3123 3124 3125 3126 3127
    expat_capi = PyCapsule_Import(PyExpat_CAPSULE_NAME, 0);
    if (expat_capi) {
        /* check that it's usable */
        if (strcmp(expat_capi->magic, PyExpat_CAPI_MAGIC) != 0 ||
            expat_capi->size < sizeof(struct PyExpat_CAPI) ||
            expat_capi->MAJOR_VERSION != XML_MAJOR_VERSION ||
            expat_capi->MINOR_VERSION != XML_MINOR_VERSION ||
            expat_capi->MICRO_VERSION != XML_MICRO_VERSION)
            expat_capi = NULL;
    }
3128 3129
#endif

3130 3131 3132 3133 3134 3135 3136
    elementtree_parseerror_obj = PyErr_NewException(
        "cElementTree.ParseError", PyExc_SyntaxError, NULL
        );
    Py_INCREF(elementtree_parseerror_obj);
    PyModule_AddObject(m, "ParseError", elementtree_parseerror_obj);

    return m;
3137
}