FM / dom

/snap/core24/1643/usr/lib/python3.12/xml/dom/

/snap/core24/1643/usr/lib/python3.12/xml/dom

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
domreg.py	3451	0644	edit dl rm
expatbuilder.py	35693	0644	edit dl rm
minicompat.py	3367	0644	edit dl rm
minidom.py	67982	0644	edit dl rm
NodeFilter.py	936	0644	edit dl rm
pulldom.py	11637	0644	edit dl rm
xmlbuilder.py	12387	0644	edit dl rm
__init__.py	4019	0644	edit dl rm

Edit: /snap/core24/1643/usr/lib/python3.12/xml/dom/expatbuilder.py (35693B)

"""Facility to use the Expat parser to load a minidom instance
from a string or file.

This avoids all the overhead of SAX and pulldom to gain performance.
"""

# Warning!
#
# This module is tightly bound to the implementation details of the
# minidom DOM and can't be used with other DOM implementations.  This
# is due, in part, to a lack of appropriate methods in the DOM (there is
# no way to create Entity and Notation nodes via the DOM Level 2
# interface), and for performance.  The latter is the cause of some fairly
# cryptic code.
#
# Performance hacks:
#
#   -  .character_data_handler() has an extra case in which continuing
#      data is appended to an existing Text node; this can be a
#      speedup since pyexpat can break up character data into multiple
#      callbacks even though we set the buffer_text attribute on the
#      parser.  This also gives us the advantage that we don't need a
#      separate normalization pass.
#
#   -  Determining that a node exists is done using an identity comparison
#      with None rather than a truth test; this avoids searching for and
#      calling any methods on the node object if it exists.  (A rather
#      nice speedup is achieved this way as well!)

from xml.dom import xmlbuilder, minidom, Node
from xml.dom import EMPTY_NAMESPACE, EMPTY_PREFIX, XMLNS_NAMESPACE
from xml.parsers import expat
from xml.dom.minidom import _append_child, _set_attribute_node
from xml.dom.NodeFilter import NodeFilter

TEXT_NODE = Node.TEXT_NODE
CDATA_SECTION_NODE = Node.CDATA_SECTION_NODE
DOCUMENT_NODE = Node.DOCUMENT_NODE

FILTER_ACCEPT = xmlbuilder.DOMBuilderFilter.FILTER_ACCEPT
FILTER_REJECT = xmlbuilder.DOMBuilderFilter.FILTER_REJECT
FILTER_SKIP = xmlbuilder.DOMBuilderFilter.FILTER_SKIP
FILTER_INTERRUPT = xmlbuilder.DOMBuilderFilter.FILTER_INTERRUPT

theDOMImplementation = minidom.getDOMImplementation()

# Expat typename -> TypeInfo
_typeinfo_map = {
    "CDATA":    minidom.TypeInfo(None, "cdata"),
    "ENUM":     minidom.TypeInfo(None, "enumeration"),
    "ENTITY":   minidom.TypeInfo(None, "entity"),
    "ENTITIES": minidom.TypeInfo(None, "entities"),
    "ID":       minidom.TypeInfo(None, "id"),
    "IDREF":    minidom.TypeInfo(None, "idref"),
    "IDREFS":   minidom.TypeInfo(None, "idrefs"),
    "NMTOKEN":  minidom.TypeInfo(None, "nmtoken"),
    "NMTOKENS": minidom.TypeInfo(None, "nmtokens"),
    }

class ElementInfo(object):
    __slots__ = '_attr_info', '_model', 'tagName'

def __init__(self, tagName, model=None):
        self.tagName = tagName
        self._attr_info = []
        self._model = model

def __getstate__(self):
        return self._attr_info, self._model, self.tagName

def __setstate__(self, state):
        self._attr_info, self._model, self.tagName = state

def getAttributeType(self, aname):
        for info in self._attr_info:
            if info[1] == aname:
                t = info[-2]
                if t[0] == "(":
                    return _typeinfo_map["ENUM"]
                else:
                    return _typeinfo_map[info[-2]]
        return minidom._no_type

def getAttributeTypeNS(self, namespaceURI, localName):
        return minidom._no_type

def isElementContent(self):
        if self._model:
            type = self._model[0]
            return type not in (expat.model.XML_CTYPE_ANY,
                                expat.model.XML_CTYPE_MIXED)
        else:
            return False

def isEmpty(self):
        if self._model:
            return self._model[0] == expat.model.XML_CTYPE_EMPTY
        else:
            return False

def isId(self, aname):
        for info in self._attr_info:
            if info[1] == aname:
                return info[-2] == "ID"
        return False

def isIdNS(self, euri, ename, auri, aname):
        # not sure this is meaningful
        return self.isId((auri, aname))

def _intern(builder, s):
    return builder._intern_setdefault(s, s)

def _parse_ns_name(builder, name):
    assert ' ' in name
    parts = name.split(' ')
    intern = builder._intern_setdefault
    if len(parts) == 3:
        uri, localname, prefix = parts
        prefix = intern(prefix, prefix)
        qname = "%s:%s" % (prefix, localname)
        qname = intern(qname, qname)
        localname = intern(localname, localname)
    elif len(parts) == 2:
        uri, localname = parts
        prefix = EMPTY_PREFIX
        qname = localname = intern(localname, localname)
    else:
        raise ValueError("Unsupported syntax: spaces in URIs not supported: %r" % name)
    return intern(uri, uri), localname, prefix, qname

class ExpatBuilder:
    """Document builder that uses Expat to build a ParsedXML.DOM document
    instance."""

def __init__(self, options=None):
        if options is None:
            options = xmlbuilder.Options()
        self._options = options
        if self._options.filter is not None:
            self._filter = FilterVisibilityController(self._options.filter)
        else:
            self._filter = None
            # This *really* doesn't do anything in this case, so
            # override it with something fast & minimal.
            self._finish_start_element = id
        self._parser = None
        self.reset()

def createParser(self):
        """Create a new parser object."""
        return expat.ParserCreate()

def getParser(self):
        """Return the parser object, creating a new one if needed."""
        if not self._parser:
            self._parser = self.createParser()
            self._intern_setdefault = self._parser.intern.setdefault
            self._parser.buffer_text = True
            self._parser.ordered_attributes = True
            self._parser.specified_attributes = True
            self.install(self._parser)
        return self._parser

def reset(self):
        """Free all data structures used during DOM construction."""
        self.document = theDOMImplementation.createDocument(
            EMPTY_NAMESPACE, None, None)
        self.curNode = self.document
        self._elem_info = self.document._elem_info
        self._cdata = False

def install(self, parser):
        """Install the callbacks needed to build the DOM into the parser."""
        # This creates circular references!
        parser.StartDoctypeDeclHandler = self.start_doctype_decl_handler
        parser.StartElementHandler = self.first_element_handler
        parser.EndElementHandler = self.end_element_handler
        parser.ProcessingInstructionHandler = self.pi_handler
        if self._options.entities:
            parser.EntityDeclHandler = self.entity_decl_handler
        parser.NotationDeclHandler = self.notation_decl_handler
        if self._options.comments:
            parser.CommentHandler = self.comment_handler
        if self._options.cdata_sections:
            parser.StartCdataSectionHandler = self.start_cdata_section_handler
            parser.EndCdataSectionHandler = self.end_cdata_section_handler
            parser.CharacterDataHandler = self.character_data_handler_cdata
        else:
            parser.CharacterDataHandler = self.character_data_handler
        parser.ExternalEntityRefHandler = self.external_entity_ref_handler
        parser.XmlDeclHandler = self.xml_decl_handler
        parser.ElementDeclHandler = self.element_decl_handler
        parser.AttlistDeclHandler = self.attlist_decl_handler

def parseFile(self, file):
        """Parse a document from a file object, returning the document
        node."""
        parser = self.getParser()
        first_buffer = True
        try:
            while buffer := file.read(16*1024):
                parser.Parse(buffer, False)
                if first_buffer and self.document.documentElement:
                    self._setup_subset(buffer)
                first_buffer = False
            parser.Parse(b"", True)
        except ParseEscape:
            pass
        doc = self.document
        self.reset()
        self._parser = None
        return doc

def parseString(self, string):
        """Parse a document from a string, returning the document node."""
        parser = self.getParser()
        try:
            parser.Parse(string, True)
            self._setup_subset(string)
        except ParseEscape:
            pass
        doc = self.document
        self.reset()
        self._parser = None
        return doc

def _setup_subset(self, buffer):
        """Load the internal subset if there might be one."""
        if self.document.doctype:
            extractor = InternalSubsetExtractor()
            extractor.parseString(buffer)
            subset = extractor.getSubset()
            self.document.doctype.internalSubset = subset

def start_doctype_decl_handler(self, doctypeName, systemId, publicId,
                                   has_internal_subset):
        doctype = self.document.implementation.createDocumentType(
            doctypeName, publicId, systemId)
        doctype.ownerDocument = self.document
        _append_child(self.document, doctype)
        self.document.doctype = doctype
        if self._filter and self._filter.acceptNode(doctype) == FILTER_REJECT:
            self.document.doctype = None
            del self.document.childNodes[-1]
            doctype = None
            self._parser.EntityDeclHandler = None
            self._parser.NotationDeclHandler = None
        if has_internal_subset:
            if doctype is not None:
                doctype.entities._seq = []
                doctype.notations._seq = []
            self._parser.CommentHandler = None
            self._parser.ProcessingInstructionHandler = None
            self._parser.EndDoctypeDeclHandler = self.end_doctype_decl_handler

def end_doctype_decl_handler(self):
        if self._options.comments:
            self._parser.CommentHandler = self.comment_handler
        self._parser.ProcessingInstructionHandler = self.pi_handler
        if not (self._elem_info or self._filter):
            self._finish_end_element = id

def pi_handler(self, target, data):
        node = self.document.createProcessingInstruction(target, data)
        _append_child(self.curNode, node)
        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
            self.curNode.removeChild(node)

def character_data_handler_cdata(self, data):
        childNodes = self.curNode.childNodes
        if self._cdata:
            if (  self._cdata_continue
                  and childNodes[-1].nodeType == CDATA_SECTION_NODE):
                childNodes[-1].appendData(data)
                return
            node = self.document.createCDATASection(data)
            self._cdata_continue = True
        elif childNodes and childNodes[-1].nodeType == TEXT_NODE:
            node = childNodes[-1]
            value = node.data + data
            node.data = value
            return
        else:
            node = minidom.Text()
            node.data = data
            node.ownerDocument = self.document
        _append_child(self.curNode, node)

def character_data_handler(self, data):
        childNodes = self.curNode.childNodes
        if childNodes and childNodes[-1].nodeType == TEXT_NODE:
            node = childNodes[-1]
            node.data = node.data + data
            return
        node = minidom.Text()
        node.data = node.data + data
        node.ownerDocument = self.document
        _append_child(self.curNode, node)

def entity_decl_handler(self, entityName, is_parameter_entity, value,
                            base, systemId, publicId, notationName):
        if is_parameter_entity:
            # we don't care about parameter entities for the DOM
            return
        if not self._options.entities:
            return
        node = self.document._create_entity(entityName, publicId,
                                            systemId, notationName)
        if value is not None:
            # internal entity
            # node *should* be readonly, but we'll cheat
            child = self.document.createTextNode(value)
            node.childNodes.append(child)
        self.document.doctype.entities._seq.append(node)
        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
            del self.document.doctype.entities._seq[-1]

def notation_decl_handler(self, notationName, base, systemId, publicId):
        node = self.document._create_notation(notationName, publicId, systemId)
        self.document.doctype.notations._seq.append(node)
        if self._filter and self._filter.acceptNode(node) == FILTER_ACCEPT:
            del self.document.doctype.notations._seq[-1]

def comment_handler(self, data):
        node = self.document.createComment(data)
        _append_child(self.curNode, node)
        if self._filter and self._filter.acceptNode(node) == FILTER_REJECT:
            self.curNode.removeChild(node)

def start_cdata_section_handler(self):
        self._cdata = True
        self._cdata_continue = False

def end_cdata_section_handler(self):
        self._cdata = False
        self._cdata_continue = False

def external_entity_ref_handler(self, context, base, systemId, publicId):
        return 1

def first_element_handler(self, name, attributes):
        if self._filter is None and not self._elem_info:
            self._finish_end_element = id
        self.getParser().StartElementHandler = self.start_element_handler
        self.start_element_handler(name, attributes)

def start_element_handler(self, name, attributes):
        node = self.document.createElement(name)
        _append_child(self.curNode, node)
        self.curNode = node

if attributes:
            for i in range(0, len(attributes), 2):
                a = minidom.Attr(attributes[i], EMPTY_NAMESPACE,
                                 None, EMPTY_PREFIX)
                value = attributes[i+1]
                a.value = value
                a.ownerDocument = self.document
                _set_attribute_node(node, a)

if node is not self.document.documentElement:
            self._finish_start_element(node)

def _finish_start_element(self, node):
        if self._filter:
            # To be general, we'd have to call isSameNode(), but this
            # is sufficient for minidom:
            if node is self.document.documentElement:
                return
            filt = self._filter.startContainer(node)
            if filt == FILTER_REJECT:
                # ignore this node & all descendents
                Rejecter(self)
            elif filt == FILTER_SKIP:
                # ignore this node, but make it's children become
                # children of the parent node
                Skipper(self)
            else:
                return
            self.curNode = node.parentNode
            node.parentNode.removeChild(node)
            node.unlink()

# If this ever changes, Namespaces.end_element_handler() needs to
    # be changed to match.
    #
    def end_element_handler(self, name):
        curNode = self.curNode
        self.curNode = curNode.parentNode
        self._finish_end_element(curNode)

def _finish_end_element(self, curNode):
        info = self._elem_info.get(curNode.tagName)
        if info:
            self._handle_white_text_nodes(curNode, info)
        if self._filter:
            if curNode is self.document.documentElement:
                return
            if self._filter.acceptNode(curNode) == FILTER_REJECT:
                self.curNode.removeChild(curNode)
                curNode.unlink()

def _handle_white_text_nodes(self, node, info):
        if (self._options.whitespace_in_element_content
            or not info.isElementContent()):
            return

# We have element type information and should remove ignorable
        # whitespace; identify for text nodes which contain only
        # whitespace.
        L = []
        for child in node.childNodes:
            if child.nodeType == TEXT_NODE and not child.data.strip():
                L.append(child)

# Remove ignorable whitespace from the tree.
        for child in L:
            node.removeChild(child)

def element_decl_handler(self, name, model):
        info = self._elem_info.get(name)
        if info is None:
            self._elem_info[name] = ElementInfo(name, model)
        else:
            assert info._model is None
            info._model = model

def attlist_decl_handler(self, elem, name, type, default, required):
        info = self._elem_info.get(elem)
        if info is None:
            info = ElementInfo(elem)
            self._elem_info[elem] = info
        info._attr_info.append(
            [None, name, None, None, default, 0, type, required])

def xml_decl_handler(self, version, encoding, standalone):
        self.document.version = version
        self.document.encoding = encoding
        # This is still a little ugly, thanks to the pyexpat API. ;-(
        if standalone >= 0:
            if standalone:
                self.document.standalone = True
            else:
                self.document.standalone = False

# Don't include FILTER_INTERRUPT, since that's checked separately
# where allowed.
_ALLOWED_FILTER_RETURNS = (FILTER_ACCEPT, FILTER_REJECT, FILTER_SKIP)

class FilterVisibilityController(object):
    """Wrapper around a DOMBuilderFilter which implements the checks
    to make the whatToShow filter attribute work."""

__slots__ = 'filter',

def __init__(self, filter):
        self.filter = filter

def startContainer(self, node):
        mask = self._nodetype_mask[node.nodeType]
        if self.filter.whatToShow & mask:
            val = self.filter.startContainer(node)
            if val == FILTER_INTERRUPT:
                raise ParseEscape
            if val not in _ALLOWED_FILTER_RETURNS:
                raise ValueError(
                      "startContainer() returned illegal value: " + repr(val))
            return val
        else:
            return FILTER_ACCEPT

def acceptNode(self, node):
        mask = self._nodetype_mask[node.nodeType]
        if self.filter.whatToShow & mask:
            val = self.filter.acceptNode(node)
            if val == FILTER_INTERRUPT:
                raise ParseEscape
            if val == FILTER_SKIP:
                # move all child nodes to the parent, and remove this node
                parent = node.parentNode
                for child in node.childNodes[:]:
                    parent.appendChild(child)
                # node is handled by the caller
                return FILTER_REJECT
            if val not in _ALLOWED_FILTER_RETURNS:
                raise ValueError(
                      "acceptNode() returned illegal value: " + repr(val))
            return val
        else:
            return FILTER_ACCEPT

_nodetype_mask = {
        Node.ELEMENT_NODE:                NodeFilter.SHOW_ELEMENT,
        Node.ATTRIBUTE_NODE:              NodeFilter.SHOW_ATTRIBUTE,
        Node.TEXT_NODE:                   NodeFilter.SHOW_TEXT,
        Node.CDATA_SECTION_NODE:          NodeFilter.SHOW_CDATA_SECTION,
        Node.ENTITY_REFERENCE_NODE:       NodeFilter.SHOW_ENTITY_REFERENCE,
        Node.ENTITY_NODE:                 NodeFilter.SHOW_ENTITY,
        Node.PROCESSING_INSTRUCTION_NODE: NodeFilter.SHOW_PROCESSING_INSTRUCTION,
        Node.COMMENT_NODE:                NodeFilter.SHOW_COMMENT,
        Node.DOCUMENT_NODE:               NodeFilter.SHOW_DOCUMENT,
        Node.DOCUMENT_TYPE_NODE:          NodeFilter.SHOW_DOCUMENT_TYPE,
        Node.DOCUMENT_FRAGMENT_NODE:      NodeFilter.SHOW_DOCUMENT_FRAGMENT,
        Node.NOTATION_NODE:               NodeFilter.SHOW_NOTATION,
        }

class FilterCrutch(object):
    __slots__ = '_builder', '_level', '_old_start', '_old_end'

def __init__(self, builder):
        self._level = 0
        self._builder = builder
        parser = builder._parser
        self._old_start = parser.StartElementHandler
        self._old_end = parser.EndElementHandler
        parser.StartElementHandler = self.start_element_handler
        parser.EndElementHandler = self.end_element_handler

class Rejecter(FilterCrutch):
    __slots__ = ()

def __init__(self, builder):
        FilterCrutch.__init__(self, builder)
        parser = builder._parser
        for name in ("ProcessingInstructionHandler",
                     "CommentHandler",
                     "CharacterDataHandler",
                     "StartCdataSectionHandler",
                     "EndCdataSectionHandler",
                     "ExternalEntityRefHandler",
                     ):
            setattr(parser, name, None)

def start_element_handler(self, *args):
        self._level = self._level + 1

def end_element_handler(self, *args):
        if self._level == 0:
            # restore the old handlers
            parser = self._builder._parser
            self._builder.install(parser)
            parser.StartElementHandler = self._old_start
            parser.EndElementHandler = self._old_end
        else:
            self._level = self._level - 1

class Skipper(FilterCrutch):
    __slots__ = ()

def start_element_handler(self, *args):
        node = self._builder.curNode
        self._old_start(*args)
        if self._builder.curNode is not node:
            self._level = self._level + 1

def end_element_handler(self, *args):
        if self._level == 0:
            # We're popping back out of the node we're skipping, so we
            # shouldn't need to do anything but reset the handlers.
            self._builder._parser.StartElementHandler = self._old_start
            self._builder._parser.EndElementHandler = self._old_end
            self._builder = None
        else:
            self._level = self._level - 1
            self._old_end(*args)

# framework document used by the fragment builder.
# Takes a string for the doctype, subset string, and namespace attrs string.

_FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID = \
    "http://xml.python.org/entities/fragment-builder/internal"

_FRAGMENT_BUILDER_TEMPLATE = (
    '''\
<!DOCTYPE wrapper
  %%s [
  <!ENTITY fragment-builder-internal
    SYSTEM "%s">
%%s
]>
<wrapper %%s
>&fragment-builder-internal;</wrapper>'''
    % _FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID)

class FragmentBuilder(ExpatBuilder):
    """Builder which constructs document fragments given XML source
    text and a context node.

The context node is expected to provide information about the
    namespace declarations which are in scope at the start of the
    fragment.
    """

def __init__(self, context, options=None):
        if context.nodeType == DOCUMENT_NODE:
            self.originalDocument = context
            self.context = context
        else:
            self.originalDocument = context.ownerDocument
            self.context = context
        ExpatBuilder.__init__(self, options)

def reset(self):
        ExpatBuilder.reset(self)
        self.fragment = None

def parseFile(self, file):
        """Parse a document fragment from a file object, returning the
        fragment node."""
        return self.parseString(file.read())

def parseString(self, string):
        """Parse a document fragment from a string, returning the
        fragment node."""
        self._source = string
        parser = self.getParser()
        doctype = self.originalDocument.doctype
        ident = ""
        if doctype:
            subset = doctype.internalSubset or self._getDeclarations()
            if doctype.publicId:
                ident = ('PUBLIC "%s" "%s"'
                         % (doctype.publicId, doctype.systemId))
            elif doctype.systemId:
                ident = 'SYSTEM "%s"' % doctype.systemId
        else:
            subset = ""
        nsattrs = self._getNSattrs() # get ns decls from node's ancestors
        document = _FRAGMENT_BUILDER_TEMPLATE % (ident, subset, nsattrs)
        try:
            parser.Parse(document, True)
        except:
            self.reset()
            raise
        fragment = self.fragment
        self.reset()
##         self._parser = None
        return fragment

def _getDeclarations(self):
        """Re-create the internal subset from the DocumentType node.

This is only needed if we don't already have the
        internalSubset as a string.
        """
        doctype = self.context.ownerDocument.doctype
        s = ""
        if doctype:
            for i in range(doctype.notations.length):
                notation = doctype.notations.item(i)
                if s:
                    s = s + "\n  "
                s = "%s<!NOTATION %s" % (s, notation.nodeName)
                if notation.publicId:
                    s = '%s PUBLIC "%s"\n             "%s">' \
                        % (s, notation.publicId, notation.systemId)
                else:
                    s = '%s SYSTEM "%s">' % (s, notation.systemId)
            for i in range(doctype.entities.length):
                entity = doctype.entities.item(i)
                if s:
                    s = s + "\n  "
                s = "%s<!ENTITY %s" % (s, entity.nodeName)
                if entity.publicId:
                    s = '%s PUBLIC "%s"\n             "%s"' \
                        % (s, entity.publicId, entity.systemId)
                elif entity.systemId:
                    s = '%s SYSTEM "%s"' % (s, entity.systemId)
                else:
                    s = '%s "%s"' % (s, entity.firstChild.data)
                if entity.notationName:
                    s = "%s NOTATION %s" % (s, entity.notationName)
                s = s + ">"
        return s

def _getNSattrs(self):
        return ""

def external_entity_ref_handler(self, context, base, systemId, publicId):
        if systemId == _FRAGMENT_BUILDER_INTERNAL_SYSTEM_ID:
            # this entref is the one that we made to put the subtree
            # in; all of our given input is parsed in here.
            old_document = self.document
            old_cur_node = self.curNode
            parser = self._parser.ExternalEntityParserCreate(context)
            # put the real document back, parse into the fragment to return
            self.document = self.originalDocument
            self.fragment = self.document.createDocumentFragment()
            self.curNode = self.fragment
            try:
                parser.Parse(self._source, True)
            finally:
                self.curNode = old_cur_node
                self.document = old_document
                self._source = None
            return -1
        else:
            return ExpatBuilder.external_entity_ref_handler(
                self, context, base, systemId, publicId)

class Namespaces:
    """Mix-in class for builders; adds support for namespaces."""

def _initNamespaces(self):
        # list of (prefix, uri) ns declarations.  Namespace attrs are
        # constructed from this and added to the element's attrs.
        self._ns_ordered_prefixes = []

def createParser(self):
        """Create a new namespace-handling parser."""
        parser = expat.ParserCreate(namespace_separator=" ")
        parser.namespace_prefixes = True
        return parser

def install(self, parser):
        """Insert the namespace-handlers onto the parser."""
        ExpatBuilder.install(self, parser)
        if self._options.namespace_declarations:
            parser.StartNamespaceDeclHandler = (
                self.start_namespace_decl_handler)

def start_namespace_decl_handler(self, prefix, uri):
        """Push this namespace declaration on our storage."""
        self._ns_ordered_prefixes.append((prefix, uri))

def start_element_handler(self, name, attributes):
        if ' ' in name:
            uri, localname, prefix, qname = _parse_ns_name(self, name)
        else:
            uri = EMPTY_NAMESPACE
            qname = name
            localname = None
            prefix = EMPTY_PREFIX
        node = minidom.Element(qname, uri, prefix, localname)
        node.ownerDocument = self.document
        _append_child(self.curNode, node)
        self.curNode = node

if self._ns_ordered_prefixes:
            for prefix, uri in self._ns_ordered_prefixes:
                if prefix:
                    a = minidom.Attr(_intern(self, 'xmlns:' + prefix),
                                     XMLNS_NAMESPACE, prefix, "xmlns")
                else:
                    a = minidom.Attr("xmlns", XMLNS_NAMESPACE,
                                     "xmlns", EMPTY_PREFIX)
                a.value = uri
                a.ownerDocument = self.document
                _set_attribute_node(node, a)
            del self._ns_ordered_prefixes[:]

if attributes:
            node._ensure_attributes()
            _attrs = node._attrs
            _attrsNS = node._attrsNS
            for i in range(0, len(attributes), 2):
                aname = attributes[i]
                value = attributes[i+1]
                if ' ' in aname:
                    uri, localname, prefix, qname = _parse_ns_name(self, aname)
                    a = minidom.Attr(qname, uri, localname, prefix)
                    _attrs[qname] = a
                    _attrsNS[(uri, localname)] = a
                else:
                    a = minidom.Attr(aname, EMPTY_NAMESPACE,
                                     aname, EMPTY_PREFIX)
                    _attrs[aname] = a
                    _attrsNS[(EMPTY_NAMESPACE, aname)] = a
                a.ownerDocument = self.document
                a.value = value
                a.ownerElement = node

if __debug__:
        # This only adds some asserts to the original
        # end_element_handler(), so we only define this when -O is not
        # used.  If changing one, be sure to check the other to see if
        # it needs to be changed as well.
        #
        def end_element_handler(self, name):
            curNode = self.curNode
            if ' ' in name:
                uri, localname, prefix, qname = _parse_ns_name(self, name)
                assert (curNode.namespaceURI == uri
                        and curNode.localName == localname
                        and curNode.prefix == prefix), \
                        "element stack messed up! (namespace)"
            else:
                assert curNode.nodeName == name, \
                       "element stack messed up - bad nodeName"
                assert curNode.namespaceURI == EMPTY_NAMESPACE, \
                       "element stack messed up - bad namespaceURI"
            self.curNode = curNode.parentNode
            self._finish_end_element(curNode)

class ExpatBuilderNS(Namespaces, ExpatBuilder):
    """Document builder that supports namespaces."""

def reset(self):
        ExpatBuilder.reset(self)
        self._initNamespaces()

class FragmentBuilderNS(Namespaces, FragmentBuilder):
    """Fragment builder that supports namespaces."""

def reset(self):
        FragmentBuilder.reset(self)
        self._initNamespaces()

def _getNSattrs(self):
        """Return string of namespace attributes from this element and
        ancestors."""
        # XXX This needs to be re-written to walk the ancestors of the
        # context to build up the namespace information from
        # declarations, elements, and attributes found in context.
        # Otherwise we have to store a bunch more data on the DOM
        # (though that *might* be more reliable -- not clear).
        attrs = ""
        context = self.context
        L = []
        while context:
            if hasattr(context, '_ns_prefix_uri'):
                for prefix, uri in context._ns_prefix_uri.items():
                    # add every new NS decl from context to L and attrs string
                    if prefix in L:
                        continue
                    L.append(prefix)
                    if prefix:
                        declname = "xmlns:" + prefix
                    else:
                        declname = "xmlns"
                    if attrs:
                        attrs = "%s\n    %s='%s'" % (attrs, declname, uri)
                    else:
                        attrs = " %s='%s'" % (declname, uri)
            context = context.parentNode
        return attrs

class ParseEscape(Exception):
    """Exception raised to short-circuit parsing in InternalSubsetExtractor."""
    pass

class InternalSubsetExtractor(ExpatBuilder):
    """XML processor which can rip out the internal document type subset."""

subset = None

def getSubset(self):
        """Return the internal subset as a string."""
        return self.subset

def parseFile(self, file):
        try:
            ExpatBuilder.parseFile(self, file)
        except ParseEscape:
            pass

def parseString(self, string):
        try:
            ExpatBuilder.parseString(self, string)
        except ParseEscape:
            pass

def install(self, parser):
        parser.StartDoctypeDeclHandler = self.start_doctype_decl_handler
        parser.StartElementHandler = self.start_element_handler

def start_doctype_decl_handler(self, name, publicId, systemId,
                                   has_internal_subset):
        if has_internal_subset:
            parser = self.getParser()
            self.subset = []
            parser.DefaultHandler = self.subset.append
            parser.EndDoctypeDeclHandler = self.end_doctype_decl_handler
        else:
            raise ParseEscape()

def end_doctype_decl_handler(self):
        s = ''.join(self.subset).replace('\r\n', '\n').replace('\r', '\n')
        self.subset = s
        raise ParseEscape()

def start_element_handler(self, name, attrs):
        raise ParseEscape()

def parse(file, namespaces=True):
    """Parse a document, returning the resulting Document node.

'file' may be either a file name or an open file object.
    """
    if namespaces:
        builder = ExpatBuilderNS()
    else:
        builder = ExpatBuilder()

if isinstance(file, str):
        with open(file, 'rb') as fp:
            result = builder.parseFile(fp)
    else:
        result = builder.parseFile(file)
    return result

def parseString(string, namespaces=True):
    """Parse a document from a string, returning the resulting
    Document node.
    """
    if namespaces:
        builder = ExpatBuilderNS()
    else:
        builder = ExpatBuilder()
    return builder.parseString(string)

def parseFragment(file, context, namespaces=True):
    """Parse a fragment of a document, given the context from which it
    was originally extracted.  context should be the parent of the
    node(s) which are in the fragment.

'file' may be either a file name or an open file object.
    """
    if namespaces:
        builder = FragmentBuilderNS(context)
    else:
        builder = FragmentBuilder(context)

if isinstance(file, str):
        with open(file, 'rb') as fp:
            result = builder.parseFile(fp)
    else:
        result = builder.parseFile(file)
    return result

def parseFragmentString(string, context, namespaces=True):
    """Parse a fragment of a document from a string, given the context
    from which it was originally extracted.  context should be the
    parent of the node(s) which are in the fragment.
    """
    if namespaces:
        builder = FragmentBuilderNS(context)
    else:
        builder = FragmentBuilder(context)
    return builder.parseString(string)

def makeBuilder(options):
    """Create a builder based on an Options object."""
    if options.namespaces:
        return ExpatBuilderNS(options)
    else:
        return ExpatBuilder(options)

cmd: