2017-01-27 14:20:52 +00:00
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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2014-03-10 05:18:05 +00:00
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__all__ = [
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'HTML5TreeBuilder',
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]
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import warnings
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2017-01-27 14:20:52 +00:00
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import re
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2014-03-10 05:18:05 +00:00
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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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2015-07-04 21:29:15 +00:00
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from bs4.element import (
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NamespacedAttribute,
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whitespace_re,
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)
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2014-03-10 05:18:05 +00:00
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import html5lib
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2017-01-27 14:20:52 +00:00
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from html5lib.constants import (
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namespaces,
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prefixes,
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)
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2014-03-10 05:18:05 +00:00
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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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2017-01-27 14:20:52 +00:00
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try:
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# 0.99999999 and up
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from html5lib.treebuilders import base as treebuilder_base
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2018-04-20 09:22:53 +00:00
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old_html5lib = False
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except ImportError:
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# Pre-0.99999999
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from html5lib.treebuilders import _base as treebuilder_base
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old_html5lib = True
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2017-01-27 14:20:52 +00:00
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2014-03-10 05:18:05 +00:00
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class HTML5TreeBuilder(HTMLTreeBuilder):
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"""Use html5lib to build a tree."""
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2015-06-14 23:45:29 +00:00
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NAME = "html5lib"
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features = [NAME, PERMISSIVE, HTML_5, HTML]
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2014-03-10 05:18:05 +00:00
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2015-07-04 21:29:15 +00:00
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def prepare_markup(self, markup, user_specified_encoding,
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document_declared_encoding=None, exclude_encodings=None):
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2014-03-10 05:18:05 +00:00
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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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2015-07-04 21:29:15 +00:00
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# document_declared_encoding and exclude_encodings aren't used
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# ATM because the html5lib TreeBuilder doesn't use
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# UnicodeDammit.
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if exclude_encodings:
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warnings.warn("You provided a value for exclude_encoding, but the html5lib tree builder doesn't support exclude_encoding.")
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2014-03-10 05:18:05 +00:00
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yield (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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2017-01-27 14:20:52 +00:00
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extra_kwargs = dict()
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if not isinstance(markup, unicode):
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2018-04-20 09:22:53 +00:00
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if not old_html5lib:
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2017-01-27 14:20:52 +00:00
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extra_kwargs['override_encoding'] = self.user_specified_encoding
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else:
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extra_kwargs['encoding'] = self.user_specified_encoding
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doc = parser.parse(markup, **extra_kwargs)
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2014-03-10 05:18:05 +00:00
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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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original_encoding = parser.tokenizer.stream.charEncoding[0]
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if not isinstance(original_encoding, basestring):
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# In 0.99999999 and up, the encoding is an html5lib
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# Encoding object. We want to use a string for compatibility
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# with other tree builders.
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original_encoding = original_encoding.name
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doc.original_encoding = original_encoding
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2014-03-10 05:18:05 +00:00
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def create_treebuilder(self, namespaceHTMLElements):
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self.underlying_builder = TreeBuilderForHtml5lib(
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namespaceHTMLElements, self.soup)
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2014-03-10 05:18:05 +00:00
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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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2017-01-27 14:20:52 +00:00
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class TreeBuilderForHtml5lib(treebuilder_base.TreeBuilder):
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2014-03-10 05:18:05 +00:00
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2017-01-27 14:20:52 +00:00
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def __init__(self, namespaceHTMLElements, soup=None):
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if soup:
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self.soup = soup
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else:
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from bs4 import BeautifulSoup
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self.soup = BeautifulSoup("", "html.parser")
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2014-03-10 05:18:05 +00:00
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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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2017-01-27 14:20:52 +00:00
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from bs4 import BeautifulSoup
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self.soup = BeautifulSoup("", "html.parser")
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2014-03-10 05:18:05 +00:00
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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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2017-01-27 14:20:52 +00:00
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return treebuilder_base.TreeBuilder.getFragment(self).element
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def testSerializer(self, element):
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from bs4 import BeautifulSoup
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rv = []
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doctype_re = re.compile(r'^(.*?)(?: PUBLIC "(.*?)"(?: "(.*?)")?| SYSTEM "(.*?)")?$')
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def serializeElement(element, indent=0):
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if isinstance(element, BeautifulSoup):
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pass
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if isinstance(element, Doctype):
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m = doctype_re.match(element)
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if m:
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name = m.group(1)
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if m.lastindex > 1:
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publicId = m.group(2) or ""
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systemId = m.group(3) or m.group(4) or ""
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rv.append("""|%s<!DOCTYPE %s "%s" "%s">""" %
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(' ' * indent, name, publicId, systemId))
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else:
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rv.append("|%s<!DOCTYPE %s>" % (' ' * indent, name))
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else:
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rv.append("|%s<!DOCTYPE >" % (' ' * indent,))
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elif isinstance(element, Comment):
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rv.append("|%s<!-- %s -->" % (' ' * indent, element))
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elif isinstance(element, NavigableString):
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rv.append("|%s\"%s\"" % (' ' * indent, element))
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else:
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if element.namespace:
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name = "%s %s" % (prefixes[element.namespace],
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element.name)
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else:
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name = element.name
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rv.append("|%s<%s>" % (' ' * indent, name))
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if element.attrs:
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attributes = []
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for name, value in element.attrs.items():
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if isinstance(name, NamespacedAttribute):
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name = "%s %s" % (prefixes[name.namespace], name.name)
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if isinstance(value, list):
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value = " ".join(value)
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attributes.append((name, value))
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for name, value in sorted(attributes):
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rv.append('|%s%s="%s"' % (' ' * (indent + 2), name, value))
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indent += 2
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for child in element.children:
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serializeElement(child, indent)
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serializeElement(element, 0)
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return "\n".join(rv)
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2014-03-10 05:18:05 +00:00
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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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2015-07-04 21:29:15 +00:00
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# If this attribute is a multi-valued attribute for this element,
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# turn its value into a list.
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list_attr = HTML5TreeBuilder.cdata_list_attributes
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if (name in list_attr['*']
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or (self.element.name in list_attr
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and name in list_attr[self.element.name])):
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2016-01-11 23:46:18 +00:00
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# A node that is being cloned may have already undergone
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# this procedure.
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if not isinstance(value, list):
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value = whitespace_re.split(value)
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2014-03-10 05:18:05 +00:00
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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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2017-01-27 14:20:52 +00:00
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class Element(treebuilder_base.Node):
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def __init__(self, element, soup, namespace):
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treebuilder_base.Node.__init__(self, element.name)
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2014-03-10 05:18:05 +00:00
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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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string_child = child = None
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if isinstance(node, basestring):
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# Some other piece of code decided to pass in a string
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# instead of creating a TextElement object to contain the
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# string.
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string_child = child = node
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elif isinstance(node, Tag):
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# Some other piece of code decided to pass in a Tag
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# instead of creating an Element object to contain the
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# Tag.
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child = node
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elif node.element.__class__ == NavigableString:
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string_child = child = node.element
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node.parent = self
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else:
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child = node.element
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node.parent = self
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2014-03-10 05:18:05 +00:00
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if not isinstance(child, basestring) and child.parent is not None:
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node.element.extract()
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if (string_child and self.element.contents
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and self.element.contents[-1].__class__ == NavigableString):
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# We are appending a string onto another string.
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# TODO 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 + string_child)
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old_element.replace_with(new_element)
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self.soup._most_recent_element = new_element
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else:
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if isinstance(node, basestring):
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# Create a brand new NavigableString from this string.
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child = self.soup.new_string(node)
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# Tell Beautiful Soup to act as if it parsed this element
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# immediately after the parent's last descendant. (Or
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# immediately after the parent, if it has no children.)
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if self.element.contents:
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most_recent_element = self.element._last_descendant(False)
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2015-06-14 23:45:29 +00:00
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elif self.element.next_element is not None:
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# Something from further ahead in the parse tree is
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# being inserted into this earlier element. This is
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# very annoying because it means an expensive search
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# for the last element in the tree.
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most_recent_element = self.soup._last_descendant()
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2014-03-10 05:18:05 +00:00
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else:
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most_recent_element = self.element
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self.soup.object_was_parsed(
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child, parent=self.element,
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most_recent_element=most_recent_element)
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def getAttributes(self):
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if isinstance(self.element, Comment):
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return {}
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2014-03-10 05:18:05 +00:00
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return AttrList(self.element)
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def setAttributes(self, attributes):
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2015-07-04 21:29:15 +00:00
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2014-03-10 05:18:05 +00:00
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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():
|
|
|
|
|
self.element[name] = value
|
|
|
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|
|
|
|
|
|
# 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):
|
2017-01-27 14:20:52 +00:00
|
|
|
text = TextNode(self.soup.new_string(data), self.soup)
|
2014-03-10 05:18:05 +00:00
|
|
|
if insertBefore:
|
2017-01-27 14:20:52 +00:00
|
|
|
self.insertBefore(text, insertBefore)
|
2014-03-10 05:18:05 +00:00
|
|
|
else:
|
2017-01-27 14:20:52 +00:00
|
|
|
self.appendChild(text)
|
2014-03-10 05:18:05 +00:00
|
|
|
|
|
|
|
|
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, new_parent):
|
|
|
|
|
"""Move all of this tag's children into another tag."""
|
2015-07-04 21:29:15 +00:00
|
|
|
# print "MOVE", self.element.contents
|
|
|
|
|
# print "FROM", self.element
|
|
|
|
|
# print "TO", new_parent.element
|
2017-01-27 14:20:52 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
element = self.element
|
|
|
|
|
new_parent_element = new_parent.element
|
|
|
|
|
# Determine what this tag's next_element will be once all the children
|
|
|
|
|
# are removed.
|
|
|
|
|
final_next_element = element.next_sibling
|
|
|
|
|
|
|
|
|
|
new_parents_last_descendant = new_parent_element._last_descendant(False, False)
|
|
|
|
|
if len(new_parent_element.contents) > 0:
|
|
|
|
|
# The new parent already contains children. We will be
|
|
|
|
|
# appending this tag's children to the end.
|
|
|
|
|
new_parents_last_child = new_parent_element.contents[-1]
|
|
|
|
|
new_parents_last_descendant_next_element = new_parents_last_descendant.next_element
|
|
|
|
|
else:
|
|
|
|
|
# The new parent contains no children.
|
|
|
|
|
new_parents_last_child = None
|
|
|
|
|
new_parents_last_descendant_next_element = new_parent_element.next_element
|
|
|
|
|
|
|
|
|
|
to_append = element.contents
|
|
|
|
|
if len(to_append) > 0:
|
|
|
|
|
# Set the first child's previous_element and previous_sibling
|
|
|
|
|
# to elements within the new parent
|
|
|
|
|
first_child = to_append[0]
|
2015-07-04 21:29:15 +00:00
|
|
|
if new_parents_last_descendant:
|
|
|
|
|
first_child.previous_element = new_parents_last_descendant
|
|
|
|
|
else:
|
|
|
|
|
first_child.previous_element = new_parent_element
|
2014-03-10 05:18:05 +00:00
|
|
|
first_child.previous_sibling = new_parents_last_child
|
2015-07-04 21:29:15 +00:00
|
|
|
if new_parents_last_descendant:
|
|
|
|
|
new_parents_last_descendant.next_element = first_child
|
|
|
|
|
else:
|
|
|
|
|
new_parent_element.next_element = first_child
|
|
|
|
|
if new_parents_last_child:
|
|
|
|
|
new_parents_last_child.next_sibling = first_child
|
2014-03-10 05:18:05 +00:00
|
|
|
|
2017-01-27 14:20:52 +00:00
|
|
|
# Find the very last element being moved. It is now the
|
|
|
|
|
# parent's last descendant. It has no .next_sibling and
|
|
|
|
|
# its .next_element is whatever the previous last
|
|
|
|
|
# descendant had.
|
|
|
|
|
last_childs_last_descendant = to_append[-1]._last_descendant(False, True)
|
|
|
|
|
|
|
|
|
|
last_childs_last_descendant.next_element = new_parents_last_descendant_next_element
|
2015-07-04 21:29:15 +00:00
|
|
|
if new_parents_last_descendant_next_element:
|
2017-01-27 14:20:52 +00:00
|
|
|
# TODO: This code has no test coverage and I'm not sure
|
|
|
|
|
# how to get html5lib to go through this path, but it's
|
|
|
|
|
# just the other side of the previous line.
|
|
|
|
|
new_parents_last_descendant_next_element.previous_element = last_childs_last_descendant
|
|
|
|
|
last_childs_last_descendant.next_sibling = None
|
2014-03-10 05:18:05 +00:00
|
|
|
|
|
|
|
|
for child in to_append:
|
|
|
|
|
child.parent = new_parent_element
|
|
|
|
|
new_parent_element.contents.append(child)
|
|
|
|
|
|
|
|
|
|
# Now that this element has no children, change its .next_element.
|
|
|
|
|
element.contents = []
|
|
|
|
|
element.next_element = final_next_element
|
|
|
|
|
|
2015-07-04 21:29:15 +00:00
|
|
|
# print "DONE WITH MOVE"
|
|
|
|
|
# print "FROM", self.element
|
|
|
|
|
# print "TO", new_parent_element
|
|
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
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):
|
2017-01-27 14:20:52 +00:00
|
|
|
treebuilder_base.Node.__init__(self, None)
|
2014-03-10 05:18:05 +00:00
|
|
|
self.element = element
|
|
|
|
|
self.soup = soup
|
|
|
|
|
|
|
|
|
|
def cloneNode(self):
|
|
|
|
|
raise NotImplementedError
|
