two version of R2R are hereHEADmaster

1 files changed, 875 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/lxml/saxparser.pxi b/.venv/lib/python3.12/site-packages/lxml/saxparser.pxi
new file mode 100644
index 00000000..dc03df9a
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/lxml/saxparser.pxi
@@ -0,0 +1,875 @@
+# SAX-like interfaces
+
+class XMLSyntaxAssertionError(XMLSyntaxError, AssertionError):
+    """
+    An XMLSyntaxError that additionally inherits from AssertionError for
+    ElementTree / backwards compatibility reasons.
+
+    This class may get replaced by a plain XMLSyntaxError in a future version.
+    """
+    def __init__(self, message):
+        XMLSyntaxError.__init__(self, message, None, 0, 1)
+
+
+ctypedef enum _SaxParserEvents:
+    SAX_EVENT_START    = 1 << 0
+    SAX_EVENT_END      = 1 << 1
+    SAX_EVENT_DATA     = 1 << 2
+    SAX_EVENT_DOCTYPE  = 1 << 3
+    SAX_EVENT_PI       = 1 << 4
+    SAX_EVENT_COMMENT  = 1 << 5
+    SAX_EVENT_START_NS = 1 << 6
+    SAX_EVENT_END_NS   = 1 << 7
+
+ctypedef enum _ParseEventFilter:
+    PARSE_EVENT_FILTER_START     = 1 << 0
+    PARSE_EVENT_FILTER_END       = 1 << 1
+    PARSE_EVENT_FILTER_START_NS  = 1 << 2
+    PARSE_EVENT_FILTER_END_NS    = 1 << 3
+    PARSE_EVENT_FILTER_COMMENT   = 1 << 4
+    PARSE_EVENT_FILTER_PI        = 1 << 5
+
+
+cdef int _buildParseEventFilter(events) except -1:
+    cdef int event_filter = 0
+    for event in events:
+        if event == 'start':
+            event_filter |= PARSE_EVENT_FILTER_START
+        elif event == 'end':
+            event_filter |= PARSE_EVENT_FILTER_END
+        elif event == 'start-ns':
+            event_filter |= PARSE_EVENT_FILTER_START_NS
+        elif event == 'end-ns':
+            event_filter |= PARSE_EVENT_FILTER_END_NS
+        elif event == 'comment':
+            event_filter |= PARSE_EVENT_FILTER_COMMENT
+        elif event == 'pi':
+            event_filter |= PARSE_EVENT_FILTER_PI
+        else:
+            raise ValueError, f"invalid event name '{event}'"
+    return event_filter
+
+
+cdef class _SaxParserTarget:
+    cdef int _sax_event_filter
+
+    cdef _handleSaxStart(self, tag, attrib, nsmap):
+        return None
+    cdef _handleSaxEnd(self, tag):
+        return None
+    cdef int _handleSaxData(self, data) except -1:
+        return 0
+    cdef int _handleSaxDoctype(self, root_tag, public_id, system_id) except -1:
+        return 0
+    cdef _handleSaxPi(self, target, data):
+        return None
+    cdef _handleSaxComment(self, comment):
+        return None
+    cdef _handleSaxStartNs(self, prefix, uri):
+        return None
+    cdef _handleSaxEndNs(self, prefix):
+        return None
+
+
+#@cython.final
+@cython.internal
+@cython.no_gc_clear  # Required because parent class uses it - Cython bug.
+cdef class _SaxParserContext(_ParserContext):
+    """This class maps SAX2 events to parser target events.
+    """
+    cdef _SaxParserTarget _target
+    cdef _BaseParser _parser
+    cdef xmlparser.startElementNsSAX2Func _origSaxStart
+    cdef xmlparser.endElementNsSAX2Func   _origSaxEnd
+    cdef xmlparser.startElementSAXFunc    _origSaxStartNoNs
+    cdef xmlparser.endElementSAXFunc      _origSaxEndNoNs
+    cdef xmlparser.charactersSAXFunc      _origSaxData
+    cdef xmlparser.cdataBlockSAXFunc      _origSaxCData
+    cdef xmlparser.internalSubsetSAXFunc  _origSaxDoctype
+    cdef xmlparser.commentSAXFunc         _origSaxComment
+    cdef xmlparser.processingInstructionSAXFunc _origSaxPI
+    cdef xmlparser.startDocumentSAXFunc   _origSaxStartDocument
+
+    # for event collecting
+    cdef int _event_filter
+    cdef list _ns_stack
+    cdef list _node_stack
+    cdef _ParseEventsIterator events_iterator
+
+    # for iterparse
+    cdef _Element  _root
+    cdef _MultiTagMatcher _matcher
+
+    def __cinit__(self, _BaseParser parser):
+        self._ns_stack = []
+        self._node_stack = []
+        self._parser = parser
+        self.events_iterator = _ParseEventsIterator()
+
+    cdef void _setSaxParserTarget(self, _SaxParserTarget target) noexcept:
+        self._target = target
+
+    cdef void _initParserContext(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        _ParserContext._initParserContext(self, c_ctxt)
+        if self._target is not None:
+            self._connectTarget(c_ctxt)
+        elif self._event_filter:
+            self._connectEvents(c_ctxt)
+
+    cdef void _connectTarget(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        """Wrap original SAX2 callbacks to call into parser target.
+        """
+        sax = c_ctxt.sax
+        self._origSaxStart = sax.startElementNs = NULL
+        self._origSaxStartNoNs = sax.startElement = NULL
+        if self._target._sax_event_filter & (SAX_EVENT_START |
+                                             SAX_EVENT_START_NS |
+                                             SAX_EVENT_END_NS):
+            # intercept => overwrite orig callback
+            # FIXME: also intercept on when collecting END events
+            if sax.initialized == xmlparser.XML_SAX2_MAGIC:
+                sax.startElementNs = _handleSaxTargetStart
+            if self._target._sax_event_filter & SAX_EVENT_START:
+                sax.startElement = _handleSaxTargetStartNoNs
+
+        self._origSaxEnd = sax.endElementNs = NULL
+        self._origSaxEndNoNs = sax.endElement = NULL
+        if self._target._sax_event_filter & (SAX_EVENT_END |
+                                             SAX_EVENT_END_NS):
+            if sax.initialized == xmlparser.XML_SAX2_MAGIC:
+                sax.endElementNs = _handleSaxEnd
+            if self._target._sax_event_filter & SAX_EVENT_END:
+                sax.endElement = _handleSaxEndNoNs
+
+        self._origSaxData = sax.characters = sax.cdataBlock = NULL
+        if self._target._sax_event_filter & SAX_EVENT_DATA:
+            sax.characters = sax.cdataBlock = _handleSaxData
+
+        # doctype propagation is always required for entity replacement
+        self._origSaxDoctype = sax.internalSubset
+        if self._target._sax_event_filter & SAX_EVENT_DOCTYPE:
+            sax.internalSubset = _handleSaxTargetDoctype
+
+        self._origSaxPI = sax.processingInstruction = NULL
+        if self._target._sax_event_filter & SAX_EVENT_PI:
+            sax.processingInstruction = _handleSaxTargetPI
+
+        self._origSaxComment = sax.comment = NULL
+        if self._target._sax_event_filter & SAX_EVENT_COMMENT:
+            sax.comment = _handleSaxTargetComment
+
+        # enforce entity replacement
+        sax.reference = NULL
+        c_ctxt.replaceEntities = 1
+
+    cdef void _connectEvents(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        """Wrap original SAX2 callbacks to collect parse events without parser target.
+        """
+        sax = c_ctxt.sax
+        self._origSaxStartDocument = sax.startDocument
+        sax.startDocument = _handleSaxStartDocument
+
+        # only override "start" event handler if needed
+        self._origSaxStart = sax.startElementNs
+        if self._event_filter == 0 or c_ctxt.html or \
+               self._event_filter & (PARSE_EVENT_FILTER_START |
+                                     PARSE_EVENT_FILTER_END |
+                                     PARSE_EVENT_FILTER_START_NS |
+                                     PARSE_EVENT_FILTER_END_NS):
+            sax.startElementNs = <xmlparser.startElementNsSAX2Func>_handleSaxStart
+
+        self._origSaxStartNoNs = sax.startElement
+        if self._event_filter == 0 or c_ctxt.html or \
+               self._event_filter & (PARSE_EVENT_FILTER_START |
+                                     PARSE_EVENT_FILTER_END):
+            sax.startElement = <xmlparser.startElementSAXFunc>_handleSaxStartNoNs
+
+        # only override "end" event handler if needed
+        self._origSaxEnd = sax.endElementNs
+        if self._event_filter == 0 or \
+               self._event_filter & (PARSE_EVENT_FILTER_END |
+                                     PARSE_EVENT_FILTER_END_NS):
+            sax.endElementNs = <xmlparser.endElementNsSAX2Func>_handleSaxEnd
+
+        self._origSaxEndNoNs = sax.endElement
+        if self._event_filter == 0 or \
+               self._event_filter & PARSE_EVENT_FILTER_END:
+            sax.endElement = <xmlparser.endElementSAXFunc>_handleSaxEndNoNs
+
+        self._origSaxComment = sax.comment
+        if self._event_filter & PARSE_EVENT_FILTER_COMMENT:
+            sax.comment = <xmlparser.commentSAXFunc>_handleSaxComment
+
+        self._origSaxPI = sax.processingInstruction
+        if self._event_filter & PARSE_EVENT_FILTER_PI:
+            sax.processingInstruction = <xmlparser.processingInstructionSAXFunc>_handleSaxPIEvent
+
+    cdef _setEventFilter(self, events, tag):
+        self._event_filter = _buildParseEventFilter(events)
+        if not self._event_filter or tag is None or tag == '*':
+            self._matcher = None
+        else:
+            self._matcher = _MultiTagMatcher.__new__(_MultiTagMatcher, tag)
+
+    cdef int startDocument(self, xmlDoc* c_doc) except -1:
+        try:
+            self._doc = _documentFactory(c_doc, self._parser)
+        finally:
+            self._parser = None  # clear circular reference ASAP
+        if self._matcher is not None:
+            self._matcher.cacheTags(self._doc, True) # force entry in libxml2 dict
+        return 0
+
+    cdef int pushEvent(self, event, xmlNode* c_node) except -1:
+        cdef _Element root
+        if self._root is None:
+            root = self._doc.getroot()
+            if root is not None and root._c_node.type == tree.XML_ELEMENT_NODE:
+                self._root = root
+        node = _elementFactory(self._doc, c_node)
+        self.events_iterator._events.append( (event, node) )
+        return 0
+
+    cdef int flushEvents(self) except -1:
+        events = self.events_iterator._events
+        while self._node_stack:
+            events.append( ('end', self._node_stack.pop()) )
+            _pushSaxNsEndEvents(self)
+        while self._ns_stack:
+            _pushSaxNsEndEvents(self)
+
+    cdef void _handleSaxException(self, xmlparser.xmlParserCtxt* c_ctxt) noexcept:
+        if c_ctxt.errNo == xmlerror.XML_ERR_OK:
+            c_ctxt.errNo = xmlerror.XML_ERR_INTERNAL_ERROR
+        # stop parsing immediately
+        c_ctxt.wellFormed = 0
+        c_ctxt.disableSAX = 1
+        c_ctxt.instate = xmlparser.XML_PARSER_EOF
+        self._store_raised()
+
+
+@cython.final
+@cython.internal
+cdef class _ParseEventsIterator:
+    """A reusable parse events iterator"""
+    cdef list _events
+    cdef int _event_index
+
+    def __cinit__(self):
+        self._events = []
+        self._event_index = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        cdef int event_index = self._event_index
+        events = self._events
+        if event_index >= 2**10 or event_index * 2 >= len(events):
+            if event_index:
+                # clean up from time to time
+                del events[:event_index]
+                self._event_index = event_index = 0
+            if event_index >= len(events):
+                raise StopIteration
+        item = events[event_index]
+        self._event_index = event_index + 1
+        return item
+
+
+cdef list _build_prefix_uri_list(_SaxParserContext context, int c_nb_namespaces,
+                                 const_xmlChar** c_namespaces):
+    "Build [(prefix, uri)] list of declared namespaces."
+    cdef int i
+    namespaces = []
+    for i in xrange(c_nb_namespaces):
+        namespaces.append((funicodeOrEmpty(c_namespaces[0]), funicode(c_namespaces[1])))
+        c_namespaces += 2
+    return namespaces
+
+
+cdef void _handleSaxStart(
+        void* ctxt, const_xmlChar* c_localname, const_xmlChar* c_prefix,
+        const_xmlChar* c_namespace, int c_nb_namespaces,
+        const_xmlChar** c_namespaces,
+        int c_nb_attributes, int c_nb_defaulted,
+        const_xmlChar** c_attributes) noexcept with gil:
+    cdef int i
+    cdef size_t c_len
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    cdef int event_filter = context._event_filter
+    try:
+        if (c_nb_namespaces and
+                event_filter & (PARSE_EVENT_FILTER_START_NS |
+                                PARSE_EVENT_FILTER_END_NS)):
+            declared_namespaces = _build_prefix_uri_list(
+                context, c_nb_namespaces, c_namespaces)
+            if event_filter & PARSE_EVENT_FILTER_START_NS:
+                for prefix_uri_tuple in declared_namespaces:
+                    context.events_iterator._events.append(("start-ns", prefix_uri_tuple))
+        else:
+            declared_namespaces = None
+
+        context._origSaxStart(c_ctxt, c_localname, c_prefix, c_namespace,
+                              c_nb_namespaces, c_namespaces, c_nb_attributes,
+                              c_nb_defaulted, c_attributes)
+        if c_ctxt.html:
+            _fixHtmlDictNodeNames(c_ctxt.dict, c_ctxt.node)
+            # The HTML parser in libxml2 reports the missing opening tags when it finds
+            # misplaced ones, but with tag names from C string constants that ignore the
+            # parser dict.  Thus, we need to intern the name ourselves.
+            c_localname = tree.xmlDictLookup(c_ctxt.dict, c_localname, -1)
+            if c_localname is NULL:
+                raise MemoryError()
+
+        if event_filter & PARSE_EVENT_FILTER_END_NS:
+            context._ns_stack.append(declared_namespaces)
+        if event_filter & (PARSE_EVENT_FILTER_END |
+                           PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, c_namespace, c_localname, None)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetStart(
+        void* ctxt, const_xmlChar* c_localname, const_xmlChar* c_prefix,
+        const_xmlChar* c_namespace, int c_nb_namespaces,
+        const_xmlChar** c_namespaces,
+        int c_nb_attributes, int c_nb_defaulted,
+        const_xmlChar** c_attributes) noexcept with gil:
+    cdef int i
+    cdef size_t c_len
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+
+    cdef int event_filter = context._event_filter
+    cdef int sax_event_filter = context._target._sax_event_filter
+    try:
+        if c_nb_namespaces:
+            declared_namespaces = _build_prefix_uri_list(
+                context, c_nb_namespaces, c_namespaces)
+
+            if event_filter & PARSE_EVENT_FILTER_START_NS:
+                for prefix_uri_tuple in declared_namespaces:
+                    context.events_iterator._events.append(("start-ns", prefix_uri_tuple))
+
+            if sax_event_filter & SAX_EVENT_START_NS:
+                for prefix, uri in declared_namespaces:
+                    context._target._handleSaxStartNs(prefix, uri)
+        else:
+            declared_namespaces = None
+
+        if sax_event_filter & SAX_EVENT_START:
+            if c_nb_defaulted > 0:
+                # only add default attributes if we asked for them
+                if c_ctxt.loadsubset & xmlparser.XML_COMPLETE_ATTRS == 0:
+                    c_nb_attributes -= c_nb_defaulted
+            if c_nb_attributes == 0:
+                attrib = IMMUTABLE_EMPTY_MAPPING
+            else:
+                attrib = {}
+                for i in xrange(c_nb_attributes):
+                    name = _namespacedNameFromNsName(
+                        c_attributes[2], c_attributes[0])
+                    if c_attributes[3] is NULL:
+                        value = ''
+                    else:
+                        c_len = c_attributes[4] - c_attributes[3]
+                        value = c_attributes[3][:c_len].decode('utf8')
+                    attrib[name] = value
+                    c_attributes += 5
+
+            nsmap = dict(declared_namespaces) if c_nb_namespaces else IMMUTABLE_EMPTY_MAPPING
+
+            element = _callTargetSaxStart(
+                context, c_ctxt,
+                _namespacedNameFromNsName(c_namespace, c_localname),
+                attrib, nsmap)
+        else:
+            element = None
+
+        if (event_filter & PARSE_EVENT_FILTER_END_NS or
+                sax_event_filter & SAX_EVENT_END_NS):
+            context._ns_stack.append(declared_namespaces)
+        if event_filter & (PARSE_EVENT_FILTER_END |
+                           PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, c_namespace,
+                               c_localname, element)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxStartNoNs(void* ctxt, const_xmlChar* c_name,
+                              const_xmlChar** c_attributes) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._origSaxStartNoNs(c_ctxt, c_name, c_attributes)
+        if c_ctxt.html:
+            _fixHtmlDictNodeNames(c_ctxt.dict, c_ctxt.node)
+            # The HTML parser in libxml2 reports the missing opening tags when it finds
+            # misplaced ones, but with tag names from C string constants that ignore the
+            # parser dict.  Thus, we need to intern the name ourselves.
+            c_name = tree.xmlDictLookup(c_ctxt.dict, c_name, -1)
+            if c_name is NULL:
+                raise MemoryError()
+        if context._event_filter & (PARSE_EVENT_FILTER_END |
+                                    PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, NULL, c_name, None)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetStartNoNs(void* ctxt, const_xmlChar* c_name,
+                                    const_xmlChar** c_attributes) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if c_attributes is NULL:
+            attrib = IMMUTABLE_EMPTY_MAPPING
+        else:
+            attrib = {}
+            while c_attributes[0] is not NULL:
+                name = funicode(c_attributes[0])
+                attrib[name] = funicodeOrEmpty(c_attributes[1])
+                c_attributes += 2
+        element = _callTargetSaxStart(
+            context, c_ctxt, funicode(c_name),
+            attrib, IMMUTABLE_EMPTY_MAPPING)
+        if context._event_filter & (PARSE_EVENT_FILTER_END |
+                                    PARSE_EVENT_FILTER_START):
+            _pushSaxStartEvent(context, c_ctxt, NULL, c_name, element)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef _callTargetSaxStart(_SaxParserContext context,
+                         xmlparser.xmlParserCtxt* c_ctxt,
+                         tag, attrib, nsmap):
+    element = context._target._handleSaxStart(tag, attrib, nsmap)
+    if element is not None and c_ctxt.input is not NULL:
+        if isinstance(element, _Element):
+            (<_Element>element)._c_node.line = (
+                <unsigned short>c_ctxt.input.line
+                if c_ctxt.input.line < 65535 else 65535)
+    return element
+
+
+cdef int _pushSaxStartEvent(_SaxParserContext context,
+                            xmlparser.xmlParserCtxt* c_ctxt,
+                            const_xmlChar* c_href,
+                            const_xmlChar* c_name, node) except -1:
+    if (context._matcher is None or
+            context._matcher.matchesNsTag(c_href, c_name)):
+        if node is None and context._target is None:
+            assert context._doc is not None
+            node = _elementFactory(context._doc, c_ctxt.node)
+        if context._event_filter & PARSE_EVENT_FILTER_START:
+            context.events_iterator._events.append(('start', node))
+        if (context._target is None and
+                context._event_filter & PARSE_EVENT_FILTER_END):
+            context._node_stack.append(node)
+    return 0
+
+
+cdef void _handleSaxEnd(void* ctxt, const_xmlChar* c_localname,
+                        const_xmlChar* c_prefix,
+                        const_xmlChar* c_namespace) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if context._target is not None:
+            if context._target._sax_event_filter & SAX_EVENT_END:
+                node = context._target._handleSaxEnd(
+                    _namespacedNameFromNsName(c_namespace, c_localname))
+            else:
+                node = None
+        else:
+            context._origSaxEnd(c_ctxt, c_localname, c_prefix, c_namespace)
+            node = None
+        _pushSaxEndEvent(context, c_namespace, c_localname, node)
+        _pushSaxNsEndEvents(context)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxEndNoNs(void* ctxt, const_xmlChar* c_name) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        if context._target is not None:
+            node = context._target._handleSaxEnd(funicode(c_name))
+        else:
+            context._origSaxEndNoNs(c_ctxt, c_name)
+            node = None
+        _pushSaxEndEvent(context, NULL, c_name, node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef int _pushSaxNsEndEvents(_SaxParserContext context) except -1:
+    cdef bint build_events = context._event_filter & PARSE_EVENT_FILTER_END_NS
+    cdef bint call_target = (
+        context._target is not None
+        and context._target._sax_event_filter & SAX_EVENT_END_NS)
+    if not build_events and not call_target:
+        return 0
+
+    cdef list declared_namespaces = context._ns_stack.pop()
+    if declared_namespaces is None:
+        return 0
+
+    cdef tuple prefix_uri
+    for prefix_uri in reversed(declared_namespaces):
+        if call_target:
+            context._target._handleSaxEndNs(prefix_uri[0])
+        if build_events:
+            context.events_iterator._events.append(('end-ns', None))
+
+    return 0
+
+
+cdef int _pushSaxEndEvent(_SaxParserContext context,
+                          const_xmlChar* c_href,
+                          const_xmlChar* c_name, node) except -1:
+    if context._event_filter & PARSE_EVENT_FILTER_END:
+        if (context._matcher is None or
+                context._matcher.matchesNsTag(c_href, c_name)):
+            if context._target is None:
+                node = context._node_stack.pop()
+            context.events_iterator._events.append(('end', node))
+    return 0
+
+
+cdef void _handleSaxData(void* ctxt, const_xmlChar* c_data, int data_len) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._target._handleSaxData(
+            c_data[:data_len].decode('utf8'))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetDoctype(void* ctxt, const_xmlChar* c_name,
+                                  const_xmlChar* c_public,
+                                  const_xmlChar* c_system) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        context._target._handleSaxDoctype(
+            funicodeOrNone(c_name),
+            funicodeOrNone(c_public),
+            funicodeOrNone(c_system))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxStartDocument(void* ctxt) noexcept with gil:
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxStartDocument(ctxt)
+    c_doc = c_ctxt.myDoc
+    try:
+        context.startDocument(c_doc)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetPI(void* ctxt, const_xmlChar* c_target,
+                             const_xmlChar* c_data) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        pi = context._target._handleSaxPi(
+            funicodeOrNone(c_target),
+            funicodeOrEmpty(c_data))
+        if context._event_filter & PARSE_EVENT_FILTER_PI:
+            context.events_iterator._events.append(('pi', pi))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxPIEvent(void* ctxt, const_xmlChar* target,
+                            const_xmlChar* data) noexcept with gil:
+    # can only be called when collecting pi events
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxPI(ctxt, target, data)
+    c_node = _findLastEventNode(c_ctxt)
+    if c_node is NULL:
+        return
+    try:
+        context.pushEvent('pi', c_node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxTargetComment(void* ctxt, const_xmlChar* c_data) noexcept with gil:
+    # can only be called if parsing with a target
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    try:
+        comment = context._target._handleSaxComment(funicodeOrEmpty(c_data))
+        if context._event_filter & PARSE_EVENT_FILTER_COMMENT:
+            context.events_iterator._events.append(('comment', comment))
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef void _handleSaxComment(void* ctxt, const_xmlChar* text) noexcept with gil:
+    # can only be called when collecting comment events
+    c_ctxt = <xmlparser.xmlParserCtxt*>ctxt
+    if c_ctxt._private is NULL or c_ctxt.disableSAX:
+        return
+    context = <_SaxParserContext>c_ctxt._private
+    context._origSaxComment(ctxt, text)
+    c_node = _findLastEventNode(c_ctxt)
+    if c_node is NULL:
+        return
+    try:
+        context.pushEvent('comment', c_node)
+    except:
+        context._handleSaxException(c_ctxt)
+    finally:
+        return  # swallow any further exceptions
+
+
+cdef inline xmlNode* _findLastEventNode(xmlparser.xmlParserCtxt* c_ctxt):
+    # this mimics what libxml2 creates for comments/PIs
+    if c_ctxt.inSubset == 1:
+        return c_ctxt.myDoc.intSubset.last
+    elif c_ctxt.inSubset == 2:
+        return c_ctxt.myDoc.extSubset.last
+    elif c_ctxt.node is NULL:
+        return c_ctxt.myDoc.last
+    elif c_ctxt.node.type == tree.XML_ELEMENT_NODE:
+        return c_ctxt.node.last
+    else:
+        return c_ctxt.node.next
+
+
+############################################################
+## ET compatible XML tree builder
+############################################################
+
+cdef class TreeBuilder(_SaxParserTarget):
+    """TreeBuilder(self, element_factory=None, parser=None,
+                    comment_factory=None, pi_factory=None,
+                    insert_comments=True, insert_pis=True)
+
+    Parser target that builds a tree from parse event callbacks.
+
+    The factory arguments can be used to influence the creation of
+    elements, comments and processing instructions.
+
+    By default, comments and processing instructions are inserted into
+    the tree, but they can be ignored by passing the respective flags.
+
+    The final tree is returned by the ``close()`` method.
+    """
+    cdef _BaseParser _parser
+    cdef object _factory
+    cdef object _comment_factory
+    cdef object _pi_factory
+    cdef list _data
+    cdef list _element_stack
+    cdef object _element_stack_pop
+    cdef _Element _last # may be None
+    cdef bint _in_tail
+    cdef bint _insert_comments
+    cdef bint _insert_pis
+
+    def __init__(self, *, element_factory=None, parser=None,
+                 comment_factory=None, pi_factory=None,
+                 bint insert_comments=True, bint insert_pis=True):
+        self._sax_event_filter = \
+            SAX_EVENT_START | SAX_EVENT_END | SAX_EVENT_DATA | \
+            SAX_EVENT_PI | SAX_EVENT_COMMENT
+        self._data = [] # data collector
+        self._element_stack = [] # element stack
+        self._element_stack_pop = self._element_stack.pop
+        self._last = None # last element
+        self._in_tail = 0 # true if we're after an end tag
+        self._factory = element_factory
+        self._comment_factory = comment_factory if comment_factory is not None else Comment
+        self._pi_factory = pi_factory if pi_factory is not None else ProcessingInstruction
+        self._insert_comments = insert_comments
+        self._insert_pis = insert_pis
+        self._parser = parser
+
+    @cython.final
+    cdef int _flush(self) except -1:
+        if self._data:
+            if self._last is not None:
+                text = "".join(self._data)
+                if self._in_tail:
+                    assert self._last.tail is None, "internal error (tail)"
+                    self._last.tail = text
+                else:
+                    assert self._last.text is None, "internal error (text)"
+                    self._last.text = text
+            del self._data[:]
+        return 0
+
+    # internal SAX event handlers
+
+    @cython.final
+    cdef _handleSaxStart(self, tag, attrib, nsmap):
+        self._flush()
+        if self._factory is not None:
+            self._last = self._factory(tag, attrib)
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+        elif self._element_stack:
+            self._last = _makeSubElement(
+                self._element_stack[-1], tag, None, None, attrib, nsmap, None)
+        else:
+            self._last = _makeElement(
+                tag, NULL, None, self._parser, None, None, attrib, nsmap, None)
+        self._element_stack.append(self._last)
+        self._in_tail = 0
+        return self._last
+
+    @cython.final
+    cdef _handleSaxEnd(self, tag):
+        self._flush()
+        self._last = self._element_stack_pop()
+        self._in_tail = 1
+        return self._last
+
+    @cython.final
+    cdef int _handleSaxData(self, data) except -1:
+        self._data.append(data)
+
+    @cython.final
+    cdef _handleSaxPi(self, target, data):
+        elem = self._pi_factory(target, data)
+        if self._insert_pis:
+            self._flush()
+            self._last = elem
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+            self._in_tail = 1
+        return self._last
+
+    @cython.final
+    cdef _handleSaxComment(self, comment):
+        elem = self._comment_factory(comment)
+        if self._insert_comments:
+            self._flush()
+            self._last = elem
+            if self._element_stack:
+                _appendChild(self._element_stack[-1], self._last)
+            self._in_tail = 1
+        return elem
+
+    # Python level event handlers
+
+    def close(self):
+        """close(self)
+
+        Flushes the builder buffers, and returns the toplevel document
+        element.  Raises XMLSyntaxError on inconsistencies.
+        """
+        if self._element_stack:
+            raise XMLSyntaxAssertionError("missing end tags")
+        # TODO: this does not necessarily seem like an error case.  Why not just return None?
+        if self._last is None:
+            raise XMLSyntaxAssertionError("missing toplevel element")
+        return self._last
+
+    def data(self, data):
+        """data(self, data)
+
+        Adds text to the current element.  The value should be either an
+        8-bit string containing ASCII text, or a Unicode string.
+        """
+        self._handleSaxData(data)
+
+    def start(self, tag, attrs, nsmap=None):
+        """start(self, tag, attrs, nsmap=None)
+
+        Opens a new element.
+        """
+        if nsmap is None:
+            nsmap = IMMUTABLE_EMPTY_MAPPING
+        return self._handleSaxStart(tag, attrs, nsmap)
+
+    def end(self, tag):
+        """end(self, tag)
+
+        Closes the current element.
+        """
+        element = self._handleSaxEnd(tag)
+        assert self._last.tag == tag,\
+            f"end tag mismatch (expected {self._last.tag}, got {tag})"
+        return element
+
+    def pi(self, target, data=None):
+        """pi(self, target, data=None)
+
+        Creates a processing instruction using the factory, appends it
+        (unless disabled) and returns it.
+        """
+        return self._handleSaxPi(target, data)
+
+    def comment(self, comment):
+        """comment(self, comment)
+
+        Creates a comment using the factory, appends it (unless disabled)
+        and returns it.
+        """
+        return self._handleSaxComment(comment)