222 lines
7.6 KiB
Python
222 lines
7.6 KiB
Python
__all__ = [
|
|
'HTML5TreeBuilder',
|
|
]
|
|
|
|
import warnings
|
|
from bs4.builder import (
|
|
PERMISSIVE,
|
|
HTML,
|
|
HTML_5,
|
|
HTMLTreeBuilder,
|
|
)
|
|
from bs4.element import NamespacedAttribute
|
|
import html5lib
|
|
from html5lib.constants import namespaces
|
|
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):
|
|
if self.soup.parse_only is not None:
|
|
warnings.warn("You provided a value for parse_only, but the html5lib tree builder doesn't support parse_only. The entire document will be parsed.")
|
|
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
|
|
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):
|
|
tag = self.soup.new_tag(name, namespace)
|
|
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 __len__(self):
|
|
return len(self.attrs)
|
|
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 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)
|
|
self.soup._most_recent_element = new_element
|
|
else:
|
|
self.soup.object_was_parsed(node.element, parent=self.element)
|
|
|
|
def getAttributes(self):
|
|
return AttrList(self.element)
|
|
|
|
def setAttributes(self, attributes):
|
|
if attributes is not None and len(attributes) > 0:
|
|
|
|
converted_attributes = []
|
|
for name, value in list(attributes.items()):
|
|
if isinstance(name, tuple):
|
|
new_name = NamespacedAttribute(*name)
|
|
del attributes[name]
|
|
attributes[new_name] = value
|
|
|
|
self.soup.builder._replace_cdata_list_attribute_values(
|
|
self.name, attributes)
|
|
for name, value in attributes.items():
|
|
self.element[name] = value
|
|
|
|
# The attributes may contain variables that need substitution.
|
|
# Call set_up_substitutions manually.
|
|
#
|
|
# The Tag constructor called this method when the Tag was created,
|
|
# but we just set/changed the attributes, so call it again.
|
|
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.element.index(refNode.element)
|
|
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, self.namespace)
|
|
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
|