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__all__ = [
'HTML5TreeBuilder',
]
from bs4.builder import (
PERMISSIVE,
HTML,
HTML_5,
HTMLTreeBuilder,
)
import html5lib
from html5lib.constants import (
DataLossWarning,
namespaces,
)
import warnings
from bs4.element import (
Comment,
Doctype,
NavigableString,
Tag,
)
class HTML5TreeBuilder(HTMLTreeBuilder):
"""Use html5lib to build a tree."""
features = ['html5lib', PERMISSIVE, HTML_5, HTML]
def prepare_markup(self, markup, user_specified_encoding):
# Store the user-specified encoding for use later on.
self.user_specified_encoding = user_specified_encoding
return markup, None, None, False
# These methods are defined by Beautiful Soup.
def feed(self, markup):
parser = html5lib.HTMLParser(tree=self.create_treebuilder)
doc = parser.parse(markup, encoding=self.user_specified_encoding)
# Set the character encoding detected by the tokenizer.
if isinstance(markup, unicode):
# We need to special-case this because html5lib sets
# charEncoding to UTF-8 if it gets Unicode input.
doc.original_encoding = None
else:
doc.original_encoding = parser.tokenizer.stream.charEncoding[0]
def create_treebuilder(self, namespaceHTMLElements):
self.underlying_builder = TreeBuilderForHtml5lib(
self.soup, namespaceHTMLElements)
return self.underlying_builder
def test_fragment_to_document(self, fragment):
"""See `TreeBuilder`."""
return u'<html><head></head><body>%s</body></html>' % fragment
class TreeBuilderForHtml5lib(html5lib.treebuilders._base.TreeBuilder):
def __init__(self, soup, namespaceHTMLElements):
self.soup = soup
if namespaceHTMLElements:
warnings.warn("namespaceHTMLElements not supported yet",
DataLossWarning)
super(TreeBuilderForHtml5lib, self).__init__(namespaceHTMLElements)
def documentClass(self):
self.soup.reset()
return Element(self.soup, self.soup, None)
def insertDoctype(self, token):
name = token["name"]
publicId = token["publicId"]
systemId = token["systemId"]
doctype = Doctype.for_name_and_ids(name, publicId, systemId)
self.soup.object_was_parsed(doctype)
def elementClass(self, name, namespace):
if namespace is not None:
warnings.warn("BeautifulSoup cannot represent elements in any namespace", DataLossWarning)
tag = self.soup.new_tag(name)
return Element(tag, self.soup, namespace)
def commentClass(self, data):
return TextNode(Comment(data), self.soup)
def fragmentClass(self):
self.soup = BeautifulSoup("")
self.soup.name = "[document_fragment]"
return Element(self.soup, self.soup, None)
def appendChild(self, node):
# XXX This code is not covered by the BS4 tests.
self.soup.append(node.element)
def getDocument(self):
return self.soup
def getFragment(self):
return html5lib.treebuilders._base.TreeBuilder.getFragment(self).element
class AttrList(object):
def __init__(self, element):
self.element = element
self.attrs = dict(self.element.attrs)
def __iter__(self):
return list(self.attrs.items()).__iter__()
def __setitem__(self, name, value):
"set attr", name, value
self.element[name] = value
def items(self):
return list(self.attrs.items())
def keys(self):
return list(self.attrs.keys())
def __getitem__(self, name):
return self.attrs[name]
def __contains__(self, name):
return name in list(self.attrs.keys())
class Element(html5lib.treebuilders._base.Node):
def __init__(self, element, soup, namespace):
html5lib.treebuilders._base.Node.__init__(self, element.name)
self.element = element
self.soup = soup
self.namespace = namespace
def _nodeIndex(self, node, refNode):
# Finds a node by identity rather than equality
for index, element in enumerate(self.element.contents):
if id(element) == id(refNode.element):
return index
return None
def appendChild(self, node):
if (node.element.__class__ == NavigableString and self.element.contents
and self.element.contents[-1].__class__ == NavigableString):
# Concatenate new text onto old text node
# XXX This has O(n^2) performance, for input like
# "a</a>a</a>a</a>..."
old_element = self.element.contents[-1]
new_element = self.soup.new_string(old_element + node.element)
old_element.replace_with(new_element)
else:
self.element.append(node.element)
node.parent = self
def getAttributes(self):
return AttrList(self.element)
def setAttributes(self, attributes):
if attributes is not None and attributes != {}:
for name, value in list(attributes.items()):
self.element[name] = value
# The attributes may contain variables that need substitution.
# Call set_up_substitutions manually.
#
# The Tag constructor calls this method automatically,
# but html5lib creates a Tag object before setting up
# its attributes, so Tags are initially created with no
# attributes.
self.element.contains_substitutions = (
self.soup.builder.set_up_substitutions(
self.element))
attributes = property(getAttributes, setAttributes)
def insertText(self, data, insertBefore=None):
text = TextNode(self.soup.new_string(data), self.soup)
if insertBefore:
self.insertBefore(text, insertBefore)
else:
self.appendChild(text)
def insertBefore(self, node, refNode):
index = self._nodeIndex(node, refNode)
if (node.element.__class__ == NavigableString and self.element.contents
and self.element.contents[index-1].__class__ == NavigableString):
# (See comments in appendChild)
old_node = self.element.contents[index-1]
new_str = self.soup.new_string(old_node + node.element)
old_node.replace_with(new_str)
else:
self.element.insert(index, node.element)
node.parent = self
def removeChild(self, node):
node.element.extract()
def reparentChildren(self, newParent):
while self.element.contents:
child = self.element.contents[0]
child.extract()
if isinstance(child, Tag):
newParent.appendChild(
Element(child, self.soup, namespaces["html"]))
else:
newParent.appendChild(
TextNode(child, self.soup))
def cloneNode(self):
tag = self.soup.new_tag(self.element.name)
node = Element(tag, self.soup, self.namespace)
for key,value in self.attributes:
node.attributes[key] = value
return node
def hasContent(self):
return self.element.contents
def getNameTuple(self):
if self.namespace == None:
return namespaces["html"], self.name
else:
return self.namespace, self.name
nameTuple = property(getNameTuple)
class TextNode(Element):
def __init__(self, element, soup):
html5lib.treebuilders._base.Node.__init__(self, None)
self.element = element
self.soup = soup
def cloneNode(self):
raise NotImplementedError
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