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Edit: /opt/alt/python37/lib/python3.7/site-packages/html5lib/treebuilders/dom.py

from __future__ import absolute_import, division, unicode_literals

from collections import MutableMapping
from xml.dom import minidom, Node
import weakref

from . import base
from .. import constants
from ..constants import namespaces
from .._utils import moduleFactoryFactory

def getDomBuilder(DomImplementation):
    Dom = DomImplementation

class AttrList(MutableMapping):
        def __init__(self, element):
            self.element = element

def __iter__(self):
            return iter(self.element.attributes.keys())

def __setitem__(self, name, value):
            if isinstance(name, tuple):
                raise NotImplementedError
            else:
                attr = self.element.ownerDocument.createAttribute(name)
                attr.value = value
                self.element.attributes[name] = attr

def __len__(self):
            return len(self.element.attributes)

def items(self):
            return list(self.element.attributes.items())

def values(self):
            return list(self.element.attributes.values())

def __getitem__(self, name):
            if isinstance(name, tuple):
                raise NotImplementedError
            else:
                return self.element.attributes[name].value

def __delitem__(self, name):
            if isinstance(name, tuple):
                raise NotImplementedError
            else:
                del self.element.attributes[name]

class NodeBuilder(base.Node):
        def __init__(self, element):
            base.Node.__init__(self, element.nodeName)
            self.element = element

namespace = property(lambda self: hasattr(self.element, "namespaceURI") and
                             self.element.namespaceURI or None)

def appendChild(self, node):
            node.parent = self
            self.element.appendChild(node.element)

def insertText(self, data, insertBefore=None):
            text = self.element.ownerDocument.createTextNode(data)
            if insertBefore:
                self.element.insertBefore(text, insertBefore.element)
            else:
                self.element.appendChild(text)

def insertBefore(self, node, refNode):
            self.element.insertBefore(node.element, refNode.element)
            node.parent = self

def removeChild(self, node):
            if node.element.parentNode == self.element:
                self.element.removeChild(node.element)
            node.parent = None

def reparentChildren(self, newParent):
            while self.element.hasChildNodes():
                child = self.element.firstChild
                self.element.removeChild(child)
                newParent.element.appendChild(child)
            self.childNodes = []

def getAttributes(self):
            return AttrList(self.element)

def setAttributes(self, attributes):
            if attributes:
                for name, value in list(attributes.items()):
                    if isinstance(name, tuple):
                        if name[0] is not None:
                            qualifiedName = (name[0] + ":" + name[1])
                        else:
                            qualifiedName = name[1]
                        self.element.setAttributeNS(name[2], qualifiedName,
                                                    value)
                    else:
                        self.element.setAttribute(
                            name, value)
        attributes = property(getAttributes, setAttributes)

def cloneNode(self):
            return NodeBuilder(self.element.cloneNode(False))

def hasContent(self):
            return self.element.hasChildNodes()

def getNameTuple(self):
            if self.namespace is None:
                return namespaces["html"], self.name
            else:
                return self.namespace, self.name

nameTuple = property(getNameTuple)

class TreeBuilder(base.TreeBuilder):  # pylint:disable=unused-variable
        def documentClass(self):
            self.dom = Dom.getDOMImplementation().createDocument(None, None, None)
            return weakref.proxy(self)

def insertDoctype(self, token):
            name = token["name"]
            publicId = token["publicId"]
            systemId = token["systemId"]

domimpl = Dom.getDOMImplementation()
            doctype = domimpl.createDocumentType(name, publicId, systemId)
            self.document.appendChild(NodeBuilder(doctype))
            if Dom == minidom:
                doctype.ownerDocument = self.dom

def elementClass(self, name, namespace=None):
            if namespace is None and self.defaultNamespace is None:
                node = self.dom.createElement(name)
            else:
                node = self.dom.createElementNS(namespace, name)

return NodeBuilder(node)

def commentClass(self, data):
            return NodeBuilder(self.dom.createComment(data))

def fragmentClass(self):
            return NodeBuilder(self.dom.createDocumentFragment())

def appendChild(self, node):
            self.dom.appendChild(node.element)

def testSerializer(self, element):
            return testSerializer(element)

def getDocument(self):
            return self.dom

def getFragment(self):
            return base.TreeBuilder.getFragment(self).element

def insertText(self, data, parent=None):
            data = data
            if parent != self:
                base.TreeBuilder.insertText(self, data, parent)
            else:
                # HACK: allow text nodes as children of the document node
                if hasattr(self.dom, '_child_node_types'):
                    # pylint:disable=protected-access
                    if Node.TEXT_NODE not in self.dom._child_node_types:
                        self.dom._child_node_types = list(self.dom._child_node_types)
                        self.dom._child_node_types.append(Node.TEXT_NODE)
                self.dom.appendChild(self.dom.createTextNode(data))

implementation = DomImplementation
        name = None

def testSerializer(element):
        element.normalize()
        rv = []

def serializeElement(element, indent=0):
            if element.nodeType == Node.DOCUMENT_TYPE_NODE:
                if element.name:
                    if element.publicId or element.systemId:
                        publicId = element.publicId or ""
                        systemId = element.systemId or ""
                        rv.append("""|%s<!DOCTYPE %s "%s" "%s">""" %
                                  (' ' * indent, element.name, publicId, systemId))
                    else:
                        rv.append("|%s<!DOCTYPE %s>" % (' ' * indent, element.name))
                else:
                    rv.append("|%s<!DOCTYPE >" % (' ' * indent,))
            elif element.nodeType == Node.DOCUMENT_NODE:
                rv.append("#document")
            elif element.nodeType == Node.DOCUMENT_FRAGMENT_NODE:
                rv.append("#document-fragment")
            elif element.nodeType == Node.COMMENT_NODE:
                rv.append("|%s" % (' ' * indent, element.nodeValue))
            elif element.nodeType == Node.TEXT_NODE:
                rv.append("|%s\"%s\"" % (' ' * indent, element.nodeValue))
            else:
                if (hasattr(element, "namespaceURI") and
                        element.namespaceURI is not None):
                    name = "%s %s" % (constants.prefixes[element.namespaceURI],
                                      element.nodeName)
                else:
                    name = element.nodeName
                rv.append("|%s<%s>" % (' ' * indent, name))
                if element.hasAttributes():
                    attributes = []
                    for i in range(len(element.attributes)):
                        attr = element.attributes.item(i)
                        name = attr.nodeName
                        value = attr.value
                        ns = attr.namespaceURI
                        if ns:
                            name = "%s %s" % (constants.prefixes[ns], attr.localName)
                        else:
                            name = attr.nodeName
                        attributes.append((name, value))

for name, value in sorted(attributes):
                        rv.append('|%s%s="%s"' % (' ' * (indent + 2), name, value))
            indent += 2
            for child in element.childNodes:
                serializeElement(child, indent)
        serializeElement(element, 0)

return "\n".join(rv)

return locals()

# The actual means to get a module!
getDomModule = moduleFactoryFactory(getDomBuilder)

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