Modules/pyexpat.c

#include "Python.h"
#include "xmlparse.h"

/*
** The version number should match the one in _checkversion
*/
#define VERSION "1.9"

enum HandlerTypes {
    StartElement,
    EndElement,
    ProcessingInstruction,
    CharacterData,
    UnparsedEntityDecl,
    NotationDecl,
    StartNamespaceDecl,
    EndNamespaceDecl,
    Comment,
    StartCdataSection,
    EndCdataSection,
    Default,
    DefaultHandlerExpand,
    NotStandalone,
    ExternalEntityRef
};

static PyObject *ErrorObject;

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

/* Declarations for objects of type xmlparser */

typedef struct {
    PyObject_HEAD

    XML_Parser itself;
    int returns_unicode; /* True if Unicode strings are returned;
                            if false, UTF-8 strings are returned */
    PyObject **handlers;
} xmlparseobject;

staticforward PyTypeObject Xmlparsetype;

typedef void (*xmlhandlersetter)(XML_Parser *self, void *meth);
typedef void* xmlhandler;

struct HandlerInfo {
    const char *name;
    xmlhandlersetter setter;
    xmlhandler handler;
};

staticforward struct HandlerInfo handler_info[64];

/* Convert an array of attributes and their values into a Python dict */

static PyObject *
conv_atts_using_string(XML_Char **atts)
{
    PyObject *attrs_obj = NULL;
    XML_Char **attrs_p, **attrs_k = NULL;
    int attrs_len;
    PyObject *rv;

    if ((attrs_obj = PyDict_New()) == NULL) 
        goto finally;
    for (attrs_len = 0, attrs_p = atts; 
         *attrs_p;
         attrs_p++, attrs_len++) {
        if (attrs_len % 2) {
            rv = PyString_FromString(*attrs_p);  
            if (!rv) {
                Py_DECREF(attrs_obj);
                attrs_obj = NULL;
                goto finally;
            }
            if (PyDict_SetItemString(attrs_obj,
                                     (char*)*attrs_k, rv) < 0) {
                Py_DECREF(attrs_obj);
                attrs_obj = NULL;
                goto finally;
            }
            Py_DECREF(rv);
        }
        else 
            attrs_k = attrs_p;
    }
 finally:
    return attrs_obj;
}

#if !(PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6)
static PyObject *
conv_atts_using_unicode(XML_Char **atts)
{
    PyObject *attrs_obj;
    XML_Char **attrs_p, **attrs_k = NULL;
    int attrs_len;

    if ((attrs_obj = PyDict_New()) == NULL) 
        goto finally;
    for (attrs_len = 0, attrs_p = atts; 
         *attrs_p;
         attrs_p++, attrs_len++) {
        if (attrs_len % 2) {
            PyObject *attr_str, *value_str;
            const char *p = (const char *) (*attrs_k);
            attr_str = PyUnicode_DecodeUTF8(p, strlen(p), "strict"); 
            if (!attr_str) {
                Py_DECREF(attrs_obj);
                attrs_obj = NULL;
                goto finally;
            }
            p = (const char *) *attrs_p;
            value_str = PyUnicode_DecodeUTF8(p, strlen(p), "strict");
            if (!value_str) {
                Py_DECREF(attrs_obj);
                Py_DECREF(attr_str);
                attrs_obj = NULL;
                goto finally;
            }
            if (PyDict_SetItem(attrs_obj, attr_str, value_str) < 0) {
                Py_DECREF(attrs_obj);
                Py_DECREF(attr_str);
                Py_DECREF(value_str);
                attrs_obj = NULL;
                goto finally;
            }
            Py_DECREF(attr_str);
            Py_DECREF(value_str);
        }
        else
            attrs_k = attrs_p;
    }
 finally:
    return attrs_obj;
}

/* Convert a string of XML_Chars into a Unicode string.
   Returns None if str is a null pointer. */

static PyObject *
conv_string_to_unicode(XML_Char *str)
{
    /* XXX currently this code assumes that XML_Char is 8-bit, 
       and hence in UTF-8.  */
    /* UTF-8 from Expat, Unicode desired */
    if (str == NULL) {
        Py_INCREF(Py_None);
        return Py_None;
    }
    return PyUnicode_DecodeUTF8((const char *)str, 
                                strlen((const char *)str), 
                                "strict");
}

static PyObject *
conv_string_len_to_unicode(const XML_Char *str, int len)
{
    /* XXX currently this code assumes that XML_Char is 8-bit, 
       and hence in UTF-8.  */
    /* UTF-8 from Expat, Unicode desired */
    if (str == NULL) {
        Py_INCREF(Py_None);
        return Py_None;
    }
    return PyUnicode_DecodeUTF8((const char *)str, len, "strict");
}
#endif

/* Convert a string of XML_Chars into an 8-bit Python string.
   Returns None if str is a null pointer. */

static PyObject *
conv_string_to_utf8(XML_Char *str)
{
    /* XXX currently this code assumes that XML_Char is 8-bit, 
       and hence in UTF-8.  */
    /* UTF-8 from Expat, UTF-8 desired */
    if (str == NULL) {
        Py_INCREF(Py_None);
        return Py_None;
    }
    return PyString_FromString((const char *)str);
}

static PyObject *
conv_string_len_to_utf8(const XML_Char *str,  int len) 
{
    /* XXX currently this code assumes that XML_Char is 8-bit, 
       and hence in UTF-8.  */
    /* UTF-8 from Expat, UTF-8 desired */
    if (str == NULL) {
        Py_INCREF(Py_None);
        return Py_None;
    }
    return PyString_FromStringAndSize((const char *)str, len);
}

/* Callback routines */

static void clear_handlers(xmlparseobject *self);

static void
flag_error(xmlparseobject *self)
{
    clear_handlers(self);
}

#define RC_HANDLER(RC, NAME, PARAMS, INIT, PARAM_FORMAT, CONVERSION, \
		RETURN, GETUSERDATA) \
\
static RC my_##NAME##Handler PARAMS {\
	xmlparseobject *self = GETUSERDATA ; \
	PyObject *args=NULL; \
	PyObject *rv=NULL; \
	INIT \
\
	if (self->handlers[NAME] \
	    && self->handlers[NAME] != Py_None) { \
		args = Py_BuildValue PARAM_FORMAT ;\
		if (!args) return RETURN; \
		rv = PyEval_CallObject(self->handlers[NAME], args); \
		Py_DECREF(args); \
		if (rv == NULL) { \
			flag_error(self); \
			return RETURN; \
		} \
		CONVERSION \
		Py_DECREF(rv); \
	} \
	return RETURN; \
}

#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
#define STRING_CONV_FUNC conv_string_to_utf8
#else
/* Python 1.6 and later versions */
#define STRING_CONV_FUNC (self->returns_unicode \
                          ? conv_string_to_unicode : conv_string_to_utf8)
#endif

#define VOID_HANDLER(NAME, PARAMS, PARAM_FORMAT) \
	RC_HANDLER(void, NAME, PARAMS, ;, PARAM_FORMAT, ;, ;,\
	(xmlparseobject *)userData)

#define INT_HANDLER(NAME, PARAMS, PARAM_FORMAT)\
	RC_HANDLER(int, NAME, PARAMS, int rc=0;, PARAM_FORMAT, \
			rc = PyInt_AsLong(rv);, rc, \
	(xmlparseobject *)userData)

#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
VOID_HANDLER(StartElement, 
		(void *userData, const XML_Char *name, const XML_Char **atts), 
                ("(O&O&)", STRING_CONV_FUNC, name, 
		 conv_atts_using_string, atts ) )
#else
/* Python 1.6 and later */
VOID_HANDLER(StartElement, 
		(void *userData, const XML_Char *name, const XML_Char **atts), 
                ("(O&O&)", STRING_CONV_FUNC, name, 
		 (self->returns_unicode  
		  ? conv_atts_using_unicode 
		  : conv_atts_using_string), atts))
#endif

VOID_HANDLER(EndElement, 
		(void *userData, const XML_Char *name), 
                ("(O&)", STRING_CONV_FUNC, name))

VOID_HANDLER(ProcessingInstruction,
		(void *userData, 
		const XML_Char *target, 
		const XML_Char *data),
                ("(O&O&)",STRING_CONV_FUNC,target, STRING_CONV_FUNC,data))

#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
VOID_HANDLER(CharacterData, 
	      (void *userData, const XML_Char *data, int len), 
	      ("(N)", conv_string_len_to_utf8(data,len)))
#else
VOID_HANDLER(CharacterData, 
	      (void *userData, const XML_Char *data, int len), 
	      ("(N)", (self->returns_unicode 
		       ? conv_string_len_to_unicode(data,len) 
		       : conv_string_len_to_utf8(data,len))))
#endif

VOID_HANDLER(UnparsedEntityDecl,
		(void *userData, 
			const XML_Char *entityName,
			const XML_Char *base,
			const XML_Char *systemId,
		        const XML_Char *publicId,
		        const XML_Char *notationName),
                ("(O&O&O&O&O&)", 
		 STRING_CONV_FUNC,entityName, STRING_CONV_FUNC,base, 
		 STRING_CONV_FUNC,systemId, STRING_CONV_FUNC,publicId, 
		 STRING_CONV_FUNC,notationName))

VOID_HANDLER(NotationDecl, 
		(void *userData,
			const XML_Char *notationName,
			const XML_Char *base,
			const XML_Char *systemId,
			const XML_Char *publicId),
                ("(O&O&O&O&)", 
		 STRING_CONV_FUNC,notationName, STRING_CONV_FUNC,base, 
		 STRING_CONV_FUNC,systemId, STRING_CONV_FUNC,publicId))

VOID_HANDLER(StartNamespaceDecl,
		(void *userData,
		      const XML_Char *prefix,
		      const XML_Char *uri),
                ("(O&O&)", STRING_CONV_FUNC,prefix, STRING_CONV_FUNC,uri))

VOID_HANDLER(EndNamespaceDecl,
		(void *userData,
		    const XML_Char *prefix),
                ("(O&)", STRING_CONV_FUNC,prefix))

VOID_HANDLER(Comment,
               (void *userData, const XML_Char *prefix),
                ("(O&)", STRING_CONV_FUNC,prefix))

VOID_HANDLER(StartCdataSection,
               (void *userData),
		("()"))
		
VOID_HANDLER(EndCdataSection,
               (void *userData),
		("()"))

#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
VOID_HANDLER(Default,
	      (void *userData,  const XML_Char *s, int len),
	      ("(N)", conv_string_len_to_utf8(s,len)))

VOID_HANDLER(DefaultHandlerExpand,
	      (void *userData,  const XML_Char *s, int len),
	      ("(N)", conv_string_len_to_utf8(s,len)))
#else
VOID_HANDLER(Default,
	      (void *userData,  const XML_Char *s, int len),
	      ("(N)", (self->returns_unicode 
		       ? conv_string_len_to_unicode(s,len) 
		       : conv_string_len_to_utf8(s,len))))

VOID_HANDLER(DefaultHandlerExpand,
	      (void *userData,  const XML_Char *s, int len),
	      ("(N)", (self->returns_unicode 
		       ? conv_string_len_to_unicode(s,len) 
		       : conv_string_len_to_utf8(s,len))))
#endif

INT_HANDLER(NotStandalone, 
		(void *userData), 
		("()"))

RC_HANDLER(int, ExternalEntityRef,
		(XML_Parser parser,
		    const XML_Char *context,
		    const XML_Char *base,
		    const XML_Char *systemId,
		    const XML_Char *publicId),
		int rc=0;,
                ("(O&O&O&O&)", 
		 STRING_CONV_FUNC,context, STRING_CONV_FUNC,base, 
		 STRING_CONV_FUNC,systemId, STRING_CONV_FUNC,publicId),
		rc = PyInt_AsLong(rv);, rc,
		XML_GetUserData(parser))
		


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

static char xmlparse_Parse__doc__[] = 
"Parse(data[, isfinal])\n\
Parse XML data.  `isfinal' should be true at end of input.";

static PyObject *
xmlparse_Parse(xmlparseobject *self, PyObject *args)
{
    char *s;
    int slen;
    int isFinal = 0;
    int rv;

    if (!PyArg_ParseTuple(args, "s#|i:Parse", &s, &slen, &isFinal))
        return NULL;
    rv = XML_Parse(self->itself, s, slen, isFinal);
    if (PyErr_Occurred()) {	
        return NULL;
    }
    else if (rv == 0) {
        PyErr_Format(ErrorObject, "%.200s: line %i, column %i",
                     XML_ErrorString(XML_GetErrorCode(self->itself)),
                     XML_GetErrorLineNumber(self->itself),
                     XML_GetErrorColumnNumber(self->itself));
        return NULL;
    }
    return PyInt_FromLong(rv);
}

/* File reading copied from cPickle */

#define BUF_SIZE 2048

static int
readinst(char *buf, int buf_size, PyObject *meth)
{
    PyObject *arg = NULL;
    PyObject *bytes = NULL;
    PyObject *str = NULL;
    int len = -1;

    if ((bytes = PyInt_FromLong(buf_size)) == NULL) {
        if (!PyErr_Occurred())
            PyErr_SetNone(PyExc_EOFError);
        goto finally;
    }
    if ((arg = PyTuple_New(1)) == NULL)
        goto finally;

    PyTuple_SET_ITEM(arg, 0, bytes);

    if ((str = PyObject_CallObject(meth, arg)) == NULL)
        goto finally;

    /* XXX what to do if it returns a Unicode string? */
    if (!PyString_Check(str)) {
        PyErr_Format(PyExc_TypeError, 
                     "read() did not return a string object (type=%.400s)",
                     str->ob_type->tp_name);
        goto finally;
    }
    len = PyString_GET_SIZE(str);
    if (len > buf_size) {
        PyErr_Format(PyExc_ValueError,
                     "read() returned too much data: "
                     "%i bytes requested, %i returned",
                     buf_size, len);
        Py_DECREF(str);
        goto finally;
    }
    memcpy(buf, PyString_AsString(str), len);
finally:
    Py_XDECREF(arg);
    Py_XDECREF(str);
    return len;
}

static char xmlparse_ParseFile__doc__[] = 
"ParseFile(file)\n\
Parse XML data from file-like object.";

static PyObject *
xmlparse_ParseFile(xmlparseobject *self, PyObject *args)
{
    int rv = 1;
    PyObject *f;
    FILE *fp;
    PyObject *readmethod = NULL;

    if (!PyArg_ParseTuple(args, "O:ParseFile", &f))
        return NULL;

    if (PyFile_Check(f)) {
        fp = PyFile_AsFile(f);
    }
    else{
        fp = NULL;
        readmethod = PyObject_GetAttrString(f, "read");
        if (readmethod == NULL) {
            PyErr_Clear();
            PyErr_SetString(PyExc_TypeError, 
                            "argument must have 'read' attribute");
            return 0;
        }
    }
    for (;;) {
        int bytes_read;
        void *buf = XML_GetBuffer(self->itself, BUF_SIZE);
        if (buf == NULL)
            return PyErr_NoMemory();

        if (fp) {
            bytes_read = fread(buf, sizeof(char), BUF_SIZE, fp);
            if (bytes_read < 0) {
                PyErr_SetFromErrno(PyExc_IOError);
                return NULL;
            }
        }
        else {
            bytes_read = readinst(buf, BUF_SIZE, readmethod);
            if (bytes_read < 0)
                return NULL;
        }
        rv = XML_ParseBuffer(self->itself, bytes_read, bytes_read == 0);
        if (PyErr_Occurred())
            return NULL;

        if (!rv || bytes_read == 0)
            break;
    }
    return Py_BuildValue("i", rv);
}

static char xmlparse_SetBase__doc__[] = 
"SetBase(base_url)\n\
Set the base URL for the parser.";

static PyObject *
xmlparse_SetBase(xmlparseobject *self, PyObject *args)
{
    char *base;

    if (!PyArg_ParseTuple(args, "s:SetBase", &base))
        return NULL;
    if (!XML_SetBase(self->itself, base)) {
	return PyErr_NoMemory();
    }
    Py_INCREF(Py_None);
    return Py_None;
}

static char xmlparse_GetBase__doc__[] = 
"GetBase() -> url\n\
Return base URL string for the parser.";

static PyObject *
xmlparse_GetBase(xmlparseobject *self, PyObject *args)
{
    if (!PyArg_ParseTuple(args, ":GetBase"))
        return NULL;

    return Py_BuildValue("z", XML_GetBase(self->itself));
}

static struct PyMethodDef xmlparse_methods[] = {
    {"Parse",	  (PyCFunction)xmlparse_Parse,
	 	  METH_VARARGS,	xmlparse_Parse__doc__},
    {"ParseFile", (PyCFunction)xmlparse_ParseFile,
	 	  METH_VARARGS,	xmlparse_ParseFile__doc__},
    {"SetBase",   (PyCFunction)xmlparse_SetBase,
	 	  METH_VARARGS,      xmlparse_SetBase__doc__},
    {"GetBase",   (PyCFunction)xmlparse_GetBase,
	 	  METH_VARARGS,      xmlparse_GetBase__doc__},
	{NULL,		NULL}		/* sentinel */
};

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


static xmlparseobject *
newxmlparseobject(char *encoding, char *namespace_separator)
{
    int i;
    xmlparseobject *self;
	
#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
    self = PyObject_NEW(xmlparseobject, &Xmlparsetype);
    if (self == NULL)
        return NULL;

    self->returns_unicode = 0;
#else
    /* Code for versions 1.6 and later */
    self = PyObject_New(xmlparseobject, &Xmlparsetype);
    if (self == NULL)
        return NULL;

    self->returns_unicode = 1;
#endif
    if (namespace_separator) {
        self->itself = XML_ParserCreateNS(encoding, *namespace_separator);
    }
    else{
        self->itself = XML_ParserCreate(encoding);
    }
    if (self->itself == NULL) {
        PyErr_SetString(PyExc_RuntimeError, 
                        "XML_ParserCreate failed");
        Py_DECREF(self);
        return NULL;
    }
    XML_SetUserData(self->itself, (void *)self);

    for(i = 0; handler_info[i].name != NULL; i++)
        /* do nothing */;

    self->handlers = malloc(sizeof(PyObject *)*i);
    clear_handlers(self);

    return self;
}


static void
xmlparse_dealloc(xmlparseobject *self)
{
    int i;
    if (self->itself)
        XML_ParserFree(self->itself);
    self->itself = NULL;

    for (i=0; handler_info[i].name != NULL; i++) {
        Py_XDECREF(self->handlers[i]);
    }
#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
    /* Code for versions before 1.6 */
    free(self);
#else
    /* Code for versions 1.6 and later */
    PyObject_Del(self);
#endif
}

static int
handlername2int(const char *name)
{
    int i;
    for (i=0; handler_info[i].name != NULL; i++) {
        if (strcmp(name, handler_info[i].name) == 0) {
            return i;
        }
    }
    return -1;
}

static PyObject *
xmlparse_getattr(xmlparseobject *self, char *name)
{
    int handlernum;
    if (strcmp(name, "ErrorCode") == 0)
        return Py_BuildValue("l",
                             (long)XML_GetErrorCode(self->itself));
    if (strcmp(name, "ErrorLineNumber") == 0)
        return Py_BuildValue("l",
                             (long)XML_GetErrorLineNumber(self->itself));
    if (strcmp(name, "ErrorColumnNumber") == 0)
        return Py_BuildValue("l",
                             (long)XML_GetErrorColumnNumber(self->itself));
    if (strcmp(name, "ErrorByteIndex") == 0)
        return Py_BuildValue("l",
                             XML_GetErrorByteIndex(self->itself));
    if (strcmp(name, "returns_unicode") == 0)
        return Py_BuildValue("i", self->returns_unicode);

    handlernum = handlername2int(name);

    if (handlernum != -1 && self->handlers[handlernum] != NULL) {
        Py_INCREF(self->handlers[handlernum]);
        return self->handlers[handlernum];
    }
    if (strcmp(name, "__members__") == 0) {
        int i;
        PyObject *rc = PyList_New(0);
        for(i = 0; handler_info[i].name!=NULL; i++) {
            PyList_Append(rc, 
                          PyString_FromString(handler_info[i].name));
        }
        PyList_Append(rc, PyString_FromString("ErrorCode"));
        PyList_Append(rc, PyString_FromString("ErrorLineNumber"));
        PyList_Append(rc, PyString_FromString("ErrorColumnNumber"));
        PyList_Append(rc, PyString_FromString("ErrorByteIndex"));

        return rc;
    }
    return Py_FindMethod(xmlparse_methods, (PyObject *)self, name);
}

static int
sethandler(xmlparseobject *self, const char *name, PyObject* v)
{
    int handlernum = handlername2int(name);
    if (handlernum != -1) {
        Py_INCREF(v);
        Py_XDECREF(self->handlers[handlernum]);
        self->handlers[handlernum] = v;
        handler_info[handlernum].setter(self->itself, 
                                        handler_info[handlernum].handler);
        return 1;
    }
    return 0;
}

static int
xmlparse_setattr(xmlparseobject *self, char *name, PyObject *v)
{
    /* Set attribute 'name' to value 'v'. v==NULL means delete */
    if (v==NULL) {
        PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
        return -1;
    }
    if (strcmp(name, "returns_unicode") == 0) {
        PyObject *intobj = PyNumber_Int(v);
        if (intobj == NULL) return -1;
        if (PyInt_AsLong(intobj)) {
#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
            PyErr_SetString(PyExc_ValueError, 
                            "Cannot return Unicode strings in Python 1.5");
            return -1;
#else
            self->returns_unicode = 1;
#endif
        }
        else
            self->returns_unicode = 0;
        Py_DECREF(intobj);
        return 0;
    }
    if (sethandler(self, name, v)) {
        return 0;
    }
    PyErr_SetString(PyExc_AttributeError, name);
    return -1;
}

static char Xmlparsetype__doc__[] = 
"XML parser";

static PyTypeObject Xmlparsetype = {
	PyObject_HEAD_INIT(NULL)
	0,				/*ob_size*/
	"xmlparser",			/*tp_name*/
	sizeof(xmlparseobject),		/*tp_basicsize*/
	0,				/*tp_itemsize*/
	/* methods */
	(destructor)xmlparse_dealloc,	/*tp_dealloc*/
	(printfunc)0,		/*tp_print*/
	(getattrfunc)xmlparse_getattr,	/*tp_getattr*/
	(setattrfunc)xmlparse_setattr,	/*tp_setattr*/
	(cmpfunc)0,		/*tp_compare*/
	(reprfunc)0,		/*tp_repr*/
	0,			/*tp_as_number*/
	0,		/*tp_as_sequence*/
	0,		/*tp_as_mapping*/
	(hashfunc)0,		/*tp_hash*/
	(ternaryfunc)0,		/*tp_call*/
	(reprfunc)0,		/*tp_str*/

	/* Space for future expansion */
	0L,0L,0L,0L,
	Xmlparsetype__doc__ /* Documentation string */
};

/* End of code for xmlparser objects */
/* -------------------------------------------------------- */


static char pyexpat_ParserCreate__doc__[] =
"ParserCreate([encoding[, namespace_separator]]) -> parser\n\
Return a new XML parser object.";

static PyObject *
pyexpat_ParserCreate(PyObject *notused, PyObject *args, PyObject *kw)
{
	char *encoding = NULL;
        char *namespace_separator = NULL;
	static char *kwlist[] = {"encoding", "namespace_separator", NULL};

	if (!PyArg_ParseTupleAndKeywords(args, kw, "|zz:ParserCreate", kwlist,
					 &encoding, &namespace_separator))
		return NULL;
	return (PyObject *)newxmlparseobject(encoding, namespace_separator);
}

static char pyexpat_ErrorString__doc__[] =
"ErrorString(errno) -> string\n\
Returns string error for given number.";

static PyObject *
pyexpat_ErrorString(PyObject *self, PyObject *args)
{
    long code = 0;

    if (!PyArg_ParseTuple(args, "l:ErrorString", &code))
        return NULL;
    return Py_BuildValue("z", XML_ErrorString((int)code));
}

/* List of methods defined in the module */

static struct PyMethodDef pyexpat_methods[] = {
    {"ParserCreate",	(PyCFunction)pyexpat_ParserCreate,
     METH_VARARGS|METH_KEYWORDS, pyexpat_ParserCreate__doc__},
    {"ErrorString",	(PyCFunction)pyexpat_ErrorString,
     METH_VARARGS,	pyexpat_ErrorString__doc__},
 
    {NULL,	 (PyCFunction)NULL, 0, NULL}		/* sentinel */
};

/* Module docstring */

static char pyexpat_module_documentation[] = 
"Python wrapper for Expat parser.";

/* Initialization function for the module */

DL_EXPORT(void) initpyexpat(void);  /* supply a prototype */

DL_EXPORT(void)
initpyexpat(void)
{
    PyObject *m, *d;
    char *rev = "$Revision$";
    PyObject *errmod_name = PyString_FromString("pyexpat.errors");
    PyObject *errors_module, *errors_dict;
    PyObject *sys_modules;

    if (errmod_name == NULL)
        return;

    Xmlparsetype.ob_type = &PyType_Type;

    /* Create the module and add the functions */
    m = Py_InitModule4("pyexpat", pyexpat_methods,
                       pyexpat_module_documentation,
                       (PyObject*)NULL, PYTHON_API_VERSION);

    /* Add some symbolic constants to the module */
    d = PyModule_GetDict(m);
    if (ErrorObject == NULL)
        ErrorObject = PyErr_NewException("pyexpat.error", NULL, NULL);
    PyDict_SetItemString(d, "error", ErrorObject);

    PyDict_SetItemString(d, "__version__",
                         PyString_FromStringAndSize(rev+11,
                                                    strlen(rev+11)-2));

    /* XXX When Expat supports some way of figuring out how it was
       compiled, this should check and set native_encoding 
       appropriately. 
    */
    PyDict_SetItemString(d, "native_encoding", 
                         PyString_FromString("UTF-8"));

    errors_module = PyDict_GetItem(d, errmod_name);
    if (errors_module == NULL) {
        errors_module = PyModule_New("pyexpat.errors");
        if (errors_module != NULL) {
            sys_modules = PySys_GetObject("modules");
            PyDict_SetItemString(d, "errors", errors_module);
            PyDict_SetItem(sys_modules, errmod_name, errors_module);
        }
    }
    Py_DECREF(errmod_name);
    if (errors_module == NULL)
        /* Don't code dump later! */
        return;

    errors_dict = PyModule_GetDict(errors_module);

#define MYCONST(name) \
    PyDict_SetItemString(errors_dict, #name,  \
			 PyString_FromString(XML_ErrorString(name)))

    MYCONST(XML_ERROR_NO_MEMORY);
    MYCONST(XML_ERROR_SYNTAX);
    MYCONST(XML_ERROR_NO_ELEMENTS);
    MYCONST(XML_ERROR_INVALID_TOKEN);
    MYCONST(XML_ERROR_UNCLOSED_TOKEN);
    MYCONST(XML_ERROR_PARTIAL_CHAR);
    MYCONST(XML_ERROR_TAG_MISMATCH);
    MYCONST(XML_ERROR_DUPLICATE_ATTRIBUTE);
    MYCONST(XML_ERROR_JUNK_AFTER_DOC_ELEMENT);
    MYCONST(XML_ERROR_PARAM_ENTITY_REF);
    MYCONST(XML_ERROR_UNDEFINED_ENTITY);
    MYCONST(XML_ERROR_RECURSIVE_ENTITY_REF);
    MYCONST(XML_ERROR_ASYNC_ENTITY);
    MYCONST(XML_ERROR_BAD_CHAR_REF);
    MYCONST(XML_ERROR_BINARY_ENTITY_REF);
    MYCONST(XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF);
    MYCONST(XML_ERROR_MISPLACED_XML_PI);
    MYCONST(XML_ERROR_UNKNOWN_ENCODING);
    MYCONST(XML_ERROR_INCORRECT_ENCODING);
}

static void
clear_handlers(xmlparseobject *self)
{
    int i = 0;

    for (; handler_info[i].name!=NULL; i++) {
        self->handlers[i]=NULL;
        handler_info[i].setter(self->itself, NULL);
    }
}

typedef void (*pairsetter)(XML_Parser, void *handler1, void *handler2);

static void
pyxml_UpdatePairedHandlers(xmlparseobject *self, 
                           int startHandler, 
                           int endHandler,
                           pairsetter setter)
{
    void *start_handler=NULL;
    void *end_handler=NULL;

    if (self->handlers[startHandler]
        && self->handlers[endHandler]!=Py_None) {
        start_handler=handler_info[startHandler].handler;
    }
    if (self->handlers[EndElement]
        && self->handlers[EndElement] !=Py_None) {
        end_handler=handler_info[endHandler].handler;
    }
    setter(self->itself, start_handler, end_handler);
}

static void
pyxml_SetStartElementHandler(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser),
                               StartElement, EndElement,
                               (pairsetter)XML_SetElementHandler);
}

static void
pyxml_SetEndElementHandler(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser), 
                               StartElement, EndElement,
                               (pairsetter)XML_SetElementHandler);
}

static void
pyxml_SetStartNamespaceDeclHandler(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser), 
                               StartNamespaceDecl, EndNamespaceDecl,
                               (pairsetter)XML_SetNamespaceDeclHandler);
}

static void
pyxml_SetEndNamespaceDeclHandler(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser), 
                               StartNamespaceDecl, EndNamespaceDecl,
                               (pairsetter)XML_SetNamespaceDeclHandler);
}

static void
pyxml_SetStartCdataSection(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser),
                               StartCdataSection, EndCdataSection,
                               (pairsetter)XML_SetCdataSectionHandler);
}

static void
pyxml_SetEndCdataSection(XML_Parser *parser, void *junk)
{
    pyxml_UpdatePairedHandlers((xmlparseobject *)XML_GetUserData(parser), 
                               StartCdataSection, EndCdataSection, 
                               (pairsetter)XML_SetCdataSectionHandler);
}

statichere struct HandlerInfo handler_info[] = {
    {"StartElementHandler", 
     pyxml_SetStartElementHandler, 
     (xmlhandler)my_StartElementHandler},
    {"EndElementHandler", 
     pyxml_SetEndElementHandler, 
     (xmlhandler)my_EndElementHandler},
    {"ProcessingInstructionHandler", 
     (xmlhandlersetter)XML_SetProcessingInstructionHandler,
     (xmlhandler)my_ProcessingInstructionHandler},
    {"CharacterDataHandler", 
     (xmlhandlersetter)XML_SetCharacterDataHandler,
     (xmlhandler)my_CharacterDataHandler},
    {"UnparsedEntityDeclHandler", 
     (xmlhandlersetter)XML_SetUnparsedEntityDeclHandler,
     (xmlhandler)my_UnparsedEntityDeclHandler },
    {"NotationDeclHandler", 
     (xmlhandlersetter)XML_SetNotationDeclHandler,
     (xmlhandler)my_NotationDeclHandler },
    {"StartNamespaceDeclHandler", 
     pyxml_SetStartNamespaceDeclHandler,
     (xmlhandler)my_StartNamespaceDeclHandler },
    {"EndNamespaceDeclHandler", 
     pyxml_SetEndNamespaceDeclHandler,
     (xmlhandler)my_EndNamespaceDeclHandler },
    {"CommentHandler",
     (xmlhandlersetter)XML_SetCommentHandler,
     (xmlhandler)my_CommentHandler},
    {"StartCdataSectionHandler",
     pyxml_SetStartCdataSection,
     (xmlhandler)my_StartCdataSectionHandler},
    {"EndCdataSectionHandler",
     pyxml_SetEndCdataSection,
     (xmlhandler)my_EndCdataSectionHandler},
    {"DefaultHandler",
     (xmlhandlersetter)XML_SetDefaultHandler,
     (xmlhandler)my_DefaultHandler},
    {"DefaultHandlerExpand",
     (xmlhandlersetter)XML_SetDefaultHandlerExpand,
     (xmlhandler)my_DefaultHandlerExpandHandler},
    {"NotStandaloneHandler",
     (xmlhandlersetter)XML_SetNotStandaloneHandler,
     (xmlhandler)my_NotStandaloneHandler},
    {"ExternalEntityRefHandler",
     (xmlhandlersetter)XML_SetExternalEntityRefHandler,
     (xmlhandler)my_ExternalEntityRefHandler },

    {NULL, NULL, NULL} /* sentinel */
};