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