diff --git a/updater/bs4/__init__.py b/updater/bs4/__init__.py new file mode 100644 index 0000000..fe2656b --- /dev/null +++ b/updater/bs4/__init__.py @@ -0,0 +1,361 @@ +"""Beautiful Soup +Elixir and Tonic +"The Screen-Scraper's Friend" +http://www.crummy.com/software/BeautifulSoup/ + +Beautiful Soup uses a pluggable XML or HTML parser to parse a +(possibly invalid) document into a tree representation. Beautiful Soup +provides provides methods and Pythonic idioms that make it easy to +navigate, search, and modify the parse tree. + +Beautiful Soup works with Python 2.6 and up. It works better if lxml +and/or html5lib is installed. + +For more than you ever wanted to know about Beautiful Soup, see the +documentation: +http://www.crummy.com/software/BeautifulSoup/bs4/doc/ +""" + +__author__ = "Leonard Richardson (leonardr@segfault.org)" +__version__ = "4.1.3" +__copyright__ = "Copyright (c) 2004-2012 Leonard Richardson" +__license__ = "MIT" + +__all__ = ['BeautifulSoup'] + +import re +import warnings + +from .builder import builder_registry +from .dammit import UnicodeDammit +from .element import ( + CData, + Comment, + DEFAULT_OUTPUT_ENCODING, + Declaration, + Doctype, + NavigableString, + PageElement, + ProcessingInstruction, + ResultSet, + SoupStrainer, + Tag, + ) + +# The very first thing we do is give a useful error if someone is +# running this code under Python 3 without converting it. +syntax_error = u'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work. You need to convert the code, either by installing it (`python setup.py install`) or by running 2to3 (`2to3 -w bs4`).' + +class BeautifulSoup(Tag): + """ + This class defines the basic interface called by the tree builders. + + These methods will be called by the parser: + reset() + feed(markup) + + The tree builder may call these methods from its feed() implementation: + handle_starttag(name, attrs) # See note about return value + handle_endtag(name) + handle_data(data) # Appends to the current data node + endData(containerClass=NavigableString) # Ends the current data node + + No matter how complicated the underlying parser is, you should be + able to build a tree using 'start tag' events, 'end tag' events, + 'data' events, and "done with data" events. + + If you encounter an empty-element tag (aka a self-closing tag, + like HTML's
tag), call handle_starttag and then + handle_endtag. + """ + ROOT_TAG_NAME = u'[document]' + + # If the end-user gives no indication which tree builder they + # want, look for one with these features. + DEFAULT_BUILDER_FEATURES = ['html', 'fast'] + + # Used when determining whether a text node is all whitespace and + # can be replaced with a single space. A text node that contains + # fancy Unicode spaces (usually non-breaking) should be left + # alone. + STRIP_ASCII_SPACES = {9: None, 10: None, 12: None, 13: None, 32: None, } + + def __init__(self, markup="", features=None, builder=None, + parse_only=None, from_encoding=None, **kwargs): + """The Soup object is initialized as the 'root tag', and the + provided markup (which can be a string or a file-like object) + is fed into the underlying parser.""" + + if 'convertEntities' in kwargs: + warnings.warn( + "BS4 does not respect the convertEntities argument to the " + "BeautifulSoup constructor. Entities are always converted " + "to Unicode characters.") + + if 'markupMassage' in kwargs: + del kwargs['markupMassage'] + warnings.warn( + "BS4 does not respect the markupMassage argument to the " + "BeautifulSoup constructor. The tree builder is responsible " + "for any necessary markup massage.") + + if 'smartQuotesTo' in kwargs: + del kwargs['smartQuotesTo'] + warnings.warn( + "BS4 does not respect the smartQuotesTo argument to the " + "BeautifulSoup constructor. Smart quotes are always converted " + "to Unicode characters.") + + if 'selfClosingTags' in kwargs: + del kwargs['selfClosingTags'] + warnings.warn( + "BS4 does not respect the selfClosingTags argument to the " + "BeautifulSoup constructor. The tree builder is responsible " + "for understanding self-closing tags.") + + if 'isHTML' in kwargs: + del kwargs['isHTML'] + warnings.warn( + "BS4 does not respect the isHTML argument to the " + "BeautifulSoup constructor. You can pass in features='html' " + "or features='xml' to get a builder capable of handling " + "one or the other.") + + def deprecated_argument(old_name, new_name): + if old_name in kwargs: + warnings.warn( + 'The "%s" argument to the BeautifulSoup constructor ' + 'has been renamed to "%s."' % (old_name, new_name)) + value = kwargs[old_name] + del kwargs[old_name] + return value + return None + + parse_only = parse_only or deprecated_argument( + "parseOnlyThese", "parse_only") + + from_encoding = from_encoding or deprecated_argument( + "fromEncoding", "from_encoding") + + if len(kwargs) > 0: + arg = kwargs.keys().pop() + raise TypeError( + "__init__() got an unexpected keyword argument '%s'" % arg) + + if builder is None: + if isinstance(features, basestring): + features = [features] + if features is None or len(features) == 0: + features = self.DEFAULT_BUILDER_FEATURES + builder_class = builder_registry.lookup(*features) + if builder_class is None: + raise FeatureNotFound( + "Couldn't find a tree builder with the features you " + "requested: %s. Do you need to install a parser library?" + % ",".join(features)) + builder = builder_class() + self.builder = builder + self.is_xml = builder.is_xml + self.builder.soup = self + + self.parse_only = parse_only + + self.reset() + + if hasattr(markup, 'read'): # It's a file-type object. + markup = markup.read() + (self.markup, self.original_encoding, self.declared_html_encoding, + self.contains_replacement_characters) = ( + self.builder.prepare_markup(markup, from_encoding)) + + try: + self._feed() + except StopParsing: + pass + + # Clear out the markup and remove the builder's circular + # reference to this object. + self.markup = None + self.builder.soup = None + + def _feed(self): + # Convert the document to Unicode. + self.builder.reset() + + self.builder.feed(self.markup) + # Close out any unfinished strings and close all the open tags. + self.endData() + while self.currentTag.name != self.ROOT_TAG_NAME: + self.popTag() + + def reset(self): + Tag.__init__(self, self, self.builder, self.ROOT_TAG_NAME) + self.hidden = 1 + self.builder.reset() + self.currentData = [] + self.currentTag = None + self.tagStack = [] + self.pushTag(self) + + def new_tag(self, name, namespace=None, nsprefix=None, **attrs): + """Create a new tag associated with this soup.""" + return Tag(None, self.builder, name, namespace, nsprefix, attrs) + + def new_string(self, s): + """Create a new NavigableString associated with this soup.""" + navigable = NavigableString(s) + navigable.setup() + return navigable + + def insert_before(self, successor): + raise NotImplementedError("BeautifulSoup objects don't support insert_before().") + + def insert_after(self, successor): + raise NotImplementedError("BeautifulSoup objects don't support insert_after().") + + def popTag(self): + tag = self.tagStack.pop() + #print "Pop", tag.name + if self.tagStack: + self.currentTag = self.tagStack[-1] + return self.currentTag + + def pushTag(self, tag): + #print "Push", tag.name + if self.currentTag: + self.currentTag.contents.append(tag) + self.tagStack.append(tag) + self.currentTag = self.tagStack[-1] + + def endData(self, containerClass=NavigableString): + if self.currentData: + currentData = u''.join(self.currentData) + if (currentData.translate(self.STRIP_ASCII_SPACES) == '' and + not set([tag.name for tag in self.tagStack]).intersection( + self.builder.preserve_whitespace_tags)): + if '\n' in currentData: + currentData = '\n' + else: + currentData = ' ' + self.currentData = [] + if self.parse_only and len(self.tagStack) <= 1 and \ + (not self.parse_only.text or \ + not self.parse_only.search(currentData)): + return + o = containerClass(currentData) + self.object_was_parsed(o) + + def object_was_parsed(self, o, parent=None, previous_element=None): + """Add an object to the parse tree.""" + parent = parent or self.currentTag + previous_element = previous_element or self.previous_element + o.setup(parent, previous_element) + if self.previous_element: + self.previous_element.next_element = o + self.previous_element = o + parent.contents.append(o) + + def _popToTag(self, name, nsprefix=None, inclusivePop=True): + """Pops the tag stack up to and including the most recent + instance of the given tag. If inclusivePop is false, pops the tag + stack up to but *not* including the most recent instqance of + the given tag.""" + #print "Popping to %s" % name + if name == self.ROOT_TAG_NAME: + return + + numPops = 0 + mostRecentTag = None + + for i in range(len(self.tagStack) - 1, 0, -1): + if (name == self.tagStack[i].name + and nsprefix == self.tagStack[i].prefix): + numPops = len(self.tagStack) - i + break + if not inclusivePop: + numPops = numPops - 1 + + for i in range(0, numPops): + mostRecentTag = self.popTag() + return mostRecentTag + + def handle_starttag(self, name, namespace, nsprefix, attrs): + """Push a start tag on to the stack. + + If this method returns None, the tag was rejected by the + SoupStrainer. You should proceed as if the tag had not occured + in the document. For instance, if this was a self-closing tag, + don't call handle_endtag. + """ + + # print "Start tag %s: %s" % (name, attrs) + self.endData() + + if (self.parse_only and len(self.tagStack) <= 1 + and (self.parse_only.text + or not self.parse_only.search_tag(name, attrs))): + return None + + tag = Tag(self, self.builder, name, namespace, nsprefix, attrs, + self.currentTag, self.previous_element) + if tag is None: + return tag + if self.previous_element: + self.previous_element.next_element = tag + self.previous_element = tag + self.pushTag(tag) + return tag + + def handle_endtag(self, name, nsprefix=None): + #print "End tag: " + name + self.endData() + self._popToTag(name, nsprefix) + + def handle_data(self, data): + self.currentData.append(data) + + def decode(self, pretty_print=False, + eventual_encoding=DEFAULT_OUTPUT_ENCODING, + formatter="minimal"): + """Returns a string or Unicode representation of this document. + To get Unicode, pass None for encoding.""" + + if self.is_xml: + # Print the XML declaration + encoding_part = '' + if eventual_encoding != None: + encoding_part = ' encoding="%s"' % eventual_encoding + prefix = u'\n' % encoding_part + else: + prefix = u'' + if not pretty_print: + indent_level = None + else: + indent_level = 0 + return prefix + super(BeautifulSoup, self).decode( + indent_level, eventual_encoding, formatter) + +class BeautifulStoneSoup(BeautifulSoup): + """Deprecated interface to an XML parser.""" + + def __init__(self, *args, **kwargs): + kwargs['features'] = 'xml' + warnings.warn( + 'The BeautifulStoneSoup class is deprecated. Instead of using ' + 'it, pass features="xml" into the BeautifulSoup constructor.') + super(BeautifulStoneSoup, self).__init__(*args, **kwargs) + + +class StopParsing(Exception): + pass + + +class FeatureNotFound(ValueError): + pass + + +#By default, act as an HTML pretty-printer. +if __name__ == '__main__': + import sys + soup = BeautifulSoup(sys.stdin) + print soup.prettify() diff --git a/updater/bs4/bs4/__init__.py b/updater/bs4/bs4/__init__.py new file mode 100644 index 0000000..fe2656b --- /dev/null +++ b/updater/bs4/bs4/__init__.py @@ -0,0 +1,361 @@ +"""Beautiful Soup +Elixir and Tonic +"The Screen-Scraper's Friend" +http://www.crummy.com/software/BeautifulSoup/ + +Beautiful Soup uses a pluggable XML or HTML parser to parse a +(possibly invalid) document into a tree representation. Beautiful Soup +provides provides methods and Pythonic idioms that make it easy to +navigate, search, and modify the parse tree. + +Beautiful Soup works with Python 2.6 and up. It works better if lxml +and/or html5lib is installed. + +For more than you ever wanted to know about Beautiful Soup, see the +documentation: +http://www.crummy.com/software/BeautifulSoup/bs4/doc/ +""" + +__author__ = "Leonard Richardson (leonardr@segfault.org)" +__version__ = "4.1.3" +__copyright__ = "Copyright (c) 2004-2012 Leonard Richardson" +__license__ = "MIT" + +__all__ = ['BeautifulSoup'] + +import re +import warnings + +from .builder import builder_registry +from .dammit import UnicodeDammit +from .element import ( + CData, + Comment, + DEFAULT_OUTPUT_ENCODING, + Declaration, + Doctype, + NavigableString, + PageElement, + ProcessingInstruction, + ResultSet, + SoupStrainer, + Tag, + ) + +# The very first thing we do is give a useful error if someone is +# running this code under Python 3 without converting it. +syntax_error = u'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work. You need to convert the code, either by installing it (`python setup.py install`) or by running 2to3 (`2to3 -w bs4`).' + +class BeautifulSoup(Tag): + """ + This class defines the basic interface called by the tree builders. + + These methods will be called by the parser: + reset() + feed(markup) + + The tree builder may call these methods from its feed() implementation: + handle_starttag(name, attrs) # See note about return value + handle_endtag(name) + handle_data(data) # Appends to the current data node + endData(containerClass=NavigableString) # Ends the current data node + + No matter how complicated the underlying parser is, you should be + able to build a tree using 'start tag' events, 'end tag' events, + 'data' events, and "done with data" events. + + If you encounter an empty-element tag (aka a self-closing tag, + like HTML's
tag), call handle_starttag and then + handle_endtag. + """ + ROOT_TAG_NAME = u'[document]' + + # If the end-user gives no indication which tree builder they + # want, look for one with these features. + DEFAULT_BUILDER_FEATURES = ['html', 'fast'] + + # Used when determining whether a text node is all whitespace and + # can be replaced with a single space. A text node that contains + # fancy Unicode spaces (usually non-breaking) should be left + # alone. + STRIP_ASCII_SPACES = {9: None, 10: None, 12: None, 13: None, 32: None, } + + def __init__(self, markup="", features=None, builder=None, + parse_only=None, from_encoding=None, **kwargs): + """The Soup object is initialized as the 'root tag', and the + provided markup (which can be a string or a file-like object) + is fed into the underlying parser.""" + + if 'convertEntities' in kwargs: + warnings.warn( + "BS4 does not respect the convertEntities argument to the " + "BeautifulSoup constructor. Entities are always converted " + "to Unicode characters.") + + if 'markupMassage' in kwargs: + del kwargs['markupMassage'] + warnings.warn( + "BS4 does not respect the markupMassage argument to the " + "BeautifulSoup constructor. The tree builder is responsible " + "for any necessary markup massage.") + + if 'smartQuotesTo' in kwargs: + del kwargs['smartQuotesTo'] + warnings.warn( + "BS4 does not respect the smartQuotesTo argument to the " + "BeautifulSoup constructor. Smart quotes are always converted " + "to Unicode characters.") + + if 'selfClosingTags' in kwargs: + del kwargs['selfClosingTags'] + warnings.warn( + "BS4 does not respect the selfClosingTags argument to the " + "BeautifulSoup constructor. The tree builder is responsible " + "for understanding self-closing tags.") + + if 'isHTML' in kwargs: + del kwargs['isHTML'] + warnings.warn( + "BS4 does not respect the isHTML argument to the " + "BeautifulSoup constructor. You can pass in features='html' " + "or features='xml' to get a builder capable of handling " + "one or the other.") + + def deprecated_argument(old_name, new_name): + if old_name in kwargs: + warnings.warn( + 'The "%s" argument to the BeautifulSoup constructor ' + 'has been renamed to "%s."' % (old_name, new_name)) + value = kwargs[old_name] + del kwargs[old_name] + return value + return None + + parse_only = parse_only or deprecated_argument( + "parseOnlyThese", "parse_only") + + from_encoding = from_encoding or deprecated_argument( + "fromEncoding", "from_encoding") + + if len(kwargs) > 0: + arg = kwargs.keys().pop() + raise TypeError( + "__init__() got an unexpected keyword argument '%s'" % arg) + + if builder is None: + if isinstance(features, basestring): + features = [features] + if features is None or len(features) == 0: + features = self.DEFAULT_BUILDER_FEATURES + builder_class = builder_registry.lookup(*features) + if builder_class is None: + raise FeatureNotFound( + "Couldn't find a tree builder with the features you " + "requested: %s. Do you need to install a parser library?" + % ",".join(features)) + builder = builder_class() + self.builder = builder + self.is_xml = builder.is_xml + self.builder.soup = self + + self.parse_only = parse_only + + self.reset() + + if hasattr(markup, 'read'): # It's a file-type object. + markup = markup.read() + (self.markup, self.original_encoding, self.declared_html_encoding, + self.contains_replacement_characters) = ( + self.builder.prepare_markup(markup, from_encoding)) + + try: + self._feed() + except StopParsing: + pass + + # Clear out the markup and remove the builder's circular + # reference to this object. + self.markup = None + self.builder.soup = None + + def _feed(self): + # Convert the document to Unicode. + self.builder.reset() + + self.builder.feed(self.markup) + # Close out any unfinished strings and close all the open tags. + self.endData() + while self.currentTag.name != self.ROOT_TAG_NAME: + self.popTag() + + def reset(self): + Tag.__init__(self, self, self.builder, self.ROOT_TAG_NAME) + self.hidden = 1 + self.builder.reset() + self.currentData = [] + self.currentTag = None + self.tagStack = [] + self.pushTag(self) + + def new_tag(self, name, namespace=None, nsprefix=None, **attrs): + """Create a new tag associated with this soup.""" + return Tag(None, self.builder, name, namespace, nsprefix, attrs) + + def new_string(self, s): + """Create a new NavigableString associated with this soup.""" + navigable = NavigableString(s) + navigable.setup() + return navigable + + def insert_before(self, successor): + raise NotImplementedError("BeautifulSoup objects don't support insert_before().") + + def insert_after(self, successor): + raise NotImplementedError("BeautifulSoup objects don't support insert_after().") + + def popTag(self): + tag = self.tagStack.pop() + #print "Pop", tag.name + if self.tagStack: + self.currentTag = self.tagStack[-1] + return self.currentTag + + def pushTag(self, tag): + #print "Push", tag.name + if self.currentTag: + self.currentTag.contents.append(tag) + self.tagStack.append(tag) + self.currentTag = self.tagStack[-1] + + def endData(self, containerClass=NavigableString): + if self.currentData: + currentData = u''.join(self.currentData) + if (currentData.translate(self.STRIP_ASCII_SPACES) == '' and + not set([tag.name for tag in self.tagStack]).intersection( + self.builder.preserve_whitespace_tags)): + if '\n' in currentData: + currentData = '\n' + else: + currentData = ' ' + self.currentData = [] + if self.parse_only and len(self.tagStack) <= 1 and \ + (not self.parse_only.text or \ + not self.parse_only.search(currentData)): + return + o = containerClass(currentData) + self.object_was_parsed(o) + + def object_was_parsed(self, o, parent=None, previous_element=None): + """Add an object to the parse tree.""" + parent = parent or self.currentTag + previous_element = previous_element or self.previous_element + o.setup(parent, previous_element) + if self.previous_element: + self.previous_element.next_element = o + self.previous_element = o + parent.contents.append(o) + + def _popToTag(self, name, nsprefix=None, inclusivePop=True): + """Pops the tag stack up to and including the most recent + instance of the given tag. If inclusivePop is false, pops the tag + stack up to but *not* including the most recent instqance of + the given tag.""" + #print "Popping to %s" % name + if name == self.ROOT_TAG_NAME: + return + + numPops = 0 + mostRecentTag = None + + for i in range(len(self.tagStack) - 1, 0, -1): + if (name == self.tagStack[i].name + and nsprefix == self.tagStack[i].prefix): + numPops = len(self.tagStack) - i + break + if not inclusivePop: + numPops = numPops - 1 + + for i in range(0, numPops): + mostRecentTag = self.popTag() + return mostRecentTag + + def handle_starttag(self, name, namespace, nsprefix, attrs): + """Push a start tag on to the stack. + + If this method returns None, the tag was rejected by the + SoupStrainer. You should proceed as if the tag had not occured + in the document. For instance, if this was a self-closing tag, + don't call handle_endtag. + """ + + # print "Start tag %s: %s" % (name, attrs) + self.endData() + + if (self.parse_only and len(self.tagStack) <= 1 + and (self.parse_only.text + or not self.parse_only.search_tag(name, attrs))): + return None + + tag = Tag(self, self.builder, name, namespace, nsprefix, attrs, + self.currentTag, self.previous_element) + if tag is None: + return tag + if self.previous_element: + self.previous_element.next_element = tag + self.previous_element = tag + self.pushTag(tag) + return tag + + def handle_endtag(self, name, nsprefix=None): + #print "End tag: " + name + self.endData() + self._popToTag(name, nsprefix) + + def handle_data(self, data): + self.currentData.append(data) + + def decode(self, pretty_print=False, + eventual_encoding=DEFAULT_OUTPUT_ENCODING, + formatter="minimal"): + """Returns a string or Unicode representation of this document. + To get Unicode, pass None for encoding.""" + + if self.is_xml: + # Print the XML declaration + encoding_part = '' + if eventual_encoding != None: + encoding_part = ' encoding="%s"' % eventual_encoding + prefix = u'\n' % encoding_part + else: + prefix = u'' + if not pretty_print: + indent_level = None + else: + indent_level = 0 + return prefix + super(BeautifulSoup, self).decode( + indent_level, eventual_encoding, formatter) + +class BeautifulStoneSoup(BeautifulSoup): + """Deprecated interface to an XML parser.""" + + def __init__(self, *args, **kwargs): + kwargs['features'] = 'xml' + warnings.warn( + 'The BeautifulStoneSoup class is deprecated. Instead of using ' + 'it, pass features="xml" into the BeautifulSoup constructor.') + super(BeautifulStoneSoup, self).__init__(*args, **kwargs) + + +class StopParsing(Exception): + pass + + +class FeatureNotFound(ValueError): + pass + + +#By default, act as an HTML pretty-printer. +if __name__ == '__main__': + import sys + soup = BeautifulSoup(sys.stdin) + print soup.prettify() diff --git a/updater/bs4/builder/__init__.py b/updater/bs4/builder/__init__.py new file mode 100644 index 0000000..dc7deb9 --- /dev/null +++ b/updater/bs4/builder/__init__.py @@ -0,0 +1,316 @@ +from collections import defaultdict +import itertools +import sys +from bs4.element import ( + CharsetMetaAttributeValue, + ContentMetaAttributeValue, + whitespace_re + ) + +__all__ = [ + 'HTMLTreeBuilder', + 'SAXTreeBuilder', + 'TreeBuilder', + 'TreeBuilderRegistry', + ] + +# Some useful features for a TreeBuilder to have. +FAST = 'fast' +PERMISSIVE = 'permissive' +STRICT = 'strict' +XML = 'xml' +HTML = 'html' +HTML_5 = 'html5' + + +class TreeBuilderRegistry(object): + + def __init__(self): + self.builders_for_feature = defaultdict(list) + self.builders = [] + + def register(self, treebuilder_class): + """Register a treebuilder based on its advertised features.""" + for feature in treebuilder_class.features: + self.builders_for_feature[feature].insert(0, treebuilder_class) + self.builders.insert(0, treebuilder_class) + + def lookup(self, *features): + if len(self.builders) == 0: + # There are no builders at all. + return None + + if len(features) == 0: + # They didn't ask for any features. Give them the most + # recently registered builder. + return self.builders[0] + + # Go down the list of features in order, and eliminate any builders + # that don't match every feature. + features = list(features) + features.reverse() + candidates = None + candidate_set = None + while len(features) > 0: + feature = features.pop() + we_have_the_feature = self.builders_for_feature.get(feature, []) + if len(we_have_the_feature) > 0: + if candidates is None: + candidates = we_have_the_feature + candidate_set = set(candidates) + else: + # Eliminate any candidates that don't have this feature. + candidate_set = candidate_set.intersection( + set(we_have_the_feature)) + + # The only valid candidates are the ones in candidate_set. + # Go through the original list of candidates and pick the first one + # that's in candidate_set. + if candidate_set is None: + return None + for candidate in candidates: + if candidate in candidate_set: + return candidate + return None + +# The BeautifulSoup class will take feature lists from developers and use them +# to look up builders in this registry. +builder_registry = TreeBuilderRegistry() + +class TreeBuilder(object): + """Turn a document into a Beautiful Soup object tree.""" + + features = [] + + is_xml = False + preserve_whitespace_tags = set() + empty_element_tags = None # A tag will be considered an empty-element + # tag when and only when it has no contents. + + # A value for these tag/attribute combinations is a space- or + # comma-separated list of CDATA, rather than a single CDATA. + cdata_list_attributes = {} + + + def __init__(self): + self.soup = None + + def reset(self): + pass + + def can_be_empty_element(self, tag_name): + """Might a tag with this name be an empty-element tag? + + The final markup may or may not actually present this tag as + self-closing. + + For instance: an HTMLBuilder does not consider a

tag to be + an empty-element tag (it's not in + HTMLBuilder.empty_element_tags). This means an empty

tag + will be presented as "

", not "

". + + The default implementation has no opinion about which tags are + empty-element tags, so a tag will be presented as an + empty-element tag if and only if it has no contents. + "" will become "", and "bar" will + be left alone. + """ + if self.empty_element_tags is None: + return True + return tag_name in self.empty_element_tags + + def feed(self, markup): + raise NotImplementedError() + + def prepare_markup(self, markup, user_specified_encoding=None, + document_declared_encoding=None): + return markup, None, None, False + + def test_fragment_to_document(self, fragment): + """Wrap an HTML fragment to make it look like a document. + + Different parsers do this differently. For instance, lxml + introduces an empty tag, and html5lib + doesn't. Abstracting this away lets us write simple tests + which run HTML fragments through the parser and compare the + results against other HTML fragments. + + This method should not be used outside of tests. + """ + return fragment + + def set_up_substitutions(self, tag): + return False + + def _replace_cdata_list_attribute_values(self, tag_name, attrs): + """Replaces class="foo bar" with class=["foo", "bar"] + + Modifies its input in place. + """ + if self.cdata_list_attributes: + universal = self.cdata_list_attributes.get('*', []) + tag_specific = self.cdata_list_attributes.get( + tag_name.lower(), []) + for cdata_list_attr in itertools.chain(universal, tag_specific): + if cdata_list_attr in dict(attrs): + # Basically, we have a "class" attribute whose + # value is a whitespace-separated list of CSS + # classes. Split it into a list. + value = attrs[cdata_list_attr] + if isinstance(value, basestring): + values = whitespace_re.split(value) + else: + # html5lib sometimes calls setAttributes twice + # for the same tag when rearranging the parse + # tree. On the second call the attribute value + # here is already a list. If this happens, + # leave the value alone rather than trying to + # split it again. + values = value + attrs[cdata_list_attr] = values + return attrs + +class SAXTreeBuilder(TreeBuilder): + """A Beautiful Soup treebuilder that listens for SAX events.""" + + def feed(self, markup): + raise NotImplementedError() + + def close(self): + pass + + def startElement(self, name, attrs): + attrs = dict((key[1], value) for key, value in list(attrs.items())) + #print "Start %s, %r" % (name, attrs) + self.soup.handle_starttag(name, attrs) + + def endElement(self, name): + #print "End %s" % name + self.soup.handle_endtag(name) + + def startElementNS(self, nsTuple, nodeName, attrs): + # Throw away (ns, nodeName) for now. + self.startElement(nodeName, attrs) + + def endElementNS(self, nsTuple, nodeName): + # Throw away (ns, nodeName) for now. + self.endElement(nodeName) + #handler.endElementNS((ns, node.nodeName), node.nodeName) + + def startPrefixMapping(self, prefix, nodeValue): + # Ignore the prefix for now. + pass + + def endPrefixMapping(self, prefix): + # Ignore the prefix for now. + # handler.endPrefixMapping(prefix) + pass + + def characters(self, content): + self.soup.handle_data(content) + + def startDocument(self): + pass + + def endDocument(self): + pass + + +class HTMLTreeBuilder(TreeBuilder): + """This TreeBuilder knows facts about HTML. + + Such as which tags are empty-element tags. + """ + + preserve_whitespace_tags = set(['pre', 'textarea']) + empty_element_tags = set(['br' , 'hr', 'input', 'img', 'meta', + 'spacer', 'link', 'frame', 'base']) + + # The HTML standard defines these attributes as containing a + # space-separated list of values, not a single value. That is, + # class="foo bar" means that the 'class' attribute has two values, + # 'foo' and 'bar', not the single value 'foo bar'. When we + # encounter one of these attributes, we will parse its value into + # a list of values if possible. Upon output, the list will be + # converted back into a string. + cdata_list_attributes = { + "*" : ['class', 'accesskey', 'dropzone'], + "a" : ['rel', 'rev'], + "link" : ['rel', 'rev'], + "td" : ["headers"], + "th" : ["headers"], + "td" : ["headers"], + "form" : ["accept-charset"], + "object" : ["archive"], + + # These are HTML5 specific, as are *.accesskey and *.dropzone above. + "area" : ["rel"], + "icon" : ["sizes"], + "iframe" : ["sandbox"], + "output" : ["for"], + } + + def set_up_substitutions(self, tag): + # We are only interested in tags + if tag.name != 'meta': + return False + + http_equiv = tag.get('http-equiv') + content = tag.get('content') + charset = tag.get('charset') + + # We are interested in tags that say what encoding the + # document was originally in. This means HTML 5-style + # tags that provide the "charset" attribute. It also means + # HTML 4-style tags that provide the "content" + # attribute and have "http-equiv" set to "content-type". + # + # In both cases we will replace the value of the appropriate + # attribute with a standin object that can take on any + # encoding. + meta_encoding = None + if charset is not None: + # HTML 5 style: + # + meta_encoding = charset + tag['charset'] = CharsetMetaAttributeValue(charset) + + elif (content is not None and http_equiv is not None + and http_equiv.lower() == 'content-type'): + # HTML 4 style: + # + tag['content'] = ContentMetaAttributeValue(content) + + return (meta_encoding is not None) + +def register_treebuilders_from(module): + """Copy TreeBuilders from the given module into this module.""" + # I'm fairly sure this is not the best way to do this. + this_module = sys.modules['bs4.builder'] + for name in module.__all__: + obj = getattr(module, name) + + if issubclass(obj, TreeBuilder): + setattr(this_module, name, obj) + this_module.__all__.append(name) + # Register the builder while we're at it. + this_module.builder_registry.register(obj) + +# Builders are registered in reverse order of priority, so that custom +# builder registrations will take precedence. In general, we want lxml +# to take precedence over html5lib, because it's faster. And we only +# want to use HTMLParser as a last result. +from . import _htmlparser +register_treebuilders_from(_htmlparser) +try: + from . import _html5lib + register_treebuilders_from(_html5lib) +except ImportError: + # They don't have html5lib installed. + pass +try: + from . import _lxml + register_treebuilders_from(_lxml) +except ImportError: + # They don't have lxml installed. + pass diff --git a/updater/bs4/builder/_html5lib.py b/updater/bs4/builder/_html5lib.py new file mode 100644 index 0000000..23e26b6 --- /dev/null +++ b/updater/bs4/builder/_html5lib.py @@ -0,0 +1,221 @@ +__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'%s' % 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 + # "aaa..." + old_element = self.element.contents[-1] + new_element = self.soup.new_string(old_element + node.element) + old_element.replace_with(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 diff --git a/updater/bs4/builder/_htmlparser.py b/updater/bs4/builder/_htmlparser.py new file mode 100644 index 0000000..ede5cec --- /dev/null +++ b/updater/bs4/builder/_htmlparser.py @@ -0,0 +1,244 @@ +"""Use the HTMLParser library to parse HTML files that aren't too bad.""" + +__all__ = [ + 'HTMLParserTreeBuilder', + ] + +from HTMLParser import ( + HTMLParser, + HTMLParseError, + ) +import sys +import warnings + +# Starting in Python 3.2, the HTMLParser constructor takes a 'strict' +# argument, which we'd like to set to False. Unfortunately, +# http://bugs.python.org/issue13273 makes strict=True a better bet +# before Python 3.2.3. +# +# At the end of this file, we monkeypatch HTMLParser so that +# strict=True works well on Python 3.2.2. +major, minor, release = sys.version_info[:3] +CONSTRUCTOR_TAKES_STRICT = ( + major > 3 + or (major == 3 and minor > 2) + or (major == 3 and minor == 2 and release >= 3)) + +from bs4.element import ( + CData, + Comment, + Declaration, + Doctype, + ProcessingInstruction, + ) +from bs4.dammit import EntitySubstitution, UnicodeDammit + +from bs4.builder import ( + HTML, + HTMLTreeBuilder, + STRICT, + ) + + +HTMLPARSER = 'html.parser' + +class BeautifulSoupHTMLParser(HTMLParser): + def handle_starttag(self, name, attrs): + # XXX namespace + self.soup.handle_starttag(name, None, None, dict(attrs)) + + def handle_endtag(self, name): + self.soup.handle_endtag(name) + + def handle_data(self, data): + self.soup.handle_data(data) + + def handle_charref(self, name): + # XXX workaround for a bug in HTMLParser. Remove this once + # it's fixed. + if name.startswith('x'): + real_name = int(name.lstrip('x'), 16) + else: + real_name = int(name) + + try: + data = unichr(real_name) + except (ValueError, OverflowError), e: + data = u"\N{REPLACEMENT CHARACTER}" + + self.handle_data(data) + + def handle_entityref(self, name): + character = EntitySubstitution.HTML_ENTITY_TO_CHARACTER.get(name) + if character is not None: + data = character + else: + data = "&%s;" % name + self.handle_data(data) + + def handle_comment(self, data): + self.soup.endData() + self.soup.handle_data(data) + self.soup.endData(Comment) + + def handle_decl(self, data): + self.soup.endData() + if data.startswith("DOCTYPE "): + data = data[len("DOCTYPE "):] + self.soup.handle_data(data) + self.soup.endData(Doctype) + + def unknown_decl(self, data): + if data.upper().startswith('CDATA['): + cls = CData + data = data[len('CDATA['):] + else: + cls = Declaration + self.soup.endData() + self.soup.handle_data(data) + self.soup.endData(cls) + + def handle_pi(self, data): + self.soup.endData() + if data.endswith("?") and data.lower().startswith("xml"): + # "An XHTML processing instruction using the trailing '?' + # will cause the '?' to be included in data." - HTMLParser + # docs. + # + # Strip the question mark so we don't end up with two + # question marks. + data = data[:-1] + self.soup.handle_data(data) + self.soup.endData(ProcessingInstruction) + + +class HTMLParserTreeBuilder(HTMLTreeBuilder): + + is_xml = False + features = [HTML, STRICT, HTMLPARSER] + + def __init__(self, *args, **kwargs): + if CONSTRUCTOR_TAKES_STRICT: + kwargs['strict'] = False + self.parser_args = (args, kwargs) + + def prepare_markup(self, markup, user_specified_encoding=None, + document_declared_encoding=None): + """ + :return: A 4-tuple (markup, original encoding, encoding + declared within markup, whether any characters had to be + replaced with REPLACEMENT CHARACTER). + """ + if isinstance(markup, unicode): + return markup, None, None, False + + try_encodings = [user_specified_encoding, document_declared_encoding] + dammit = UnicodeDammit(markup, try_encodings, is_html=True) + return (dammit.markup, dammit.original_encoding, + dammit.declared_html_encoding, + dammit.contains_replacement_characters) + + def feed(self, markup): + args, kwargs = self.parser_args + parser = BeautifulSoupHTMLParser(*args, **kwargs) + parser.soup = self.soup + try: + parser.feed(markup) + except HTMLParseError, e: + warnings.warn(RuntimeWarning( + "Python's built-in HTMLParser cannot parse the given document. This is not a bug in Beautiful Soup. The best solution is to install an external parser (lxml or html5lib), and use Beautiful Soup with that parser. See http://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-a-parser for help.")) + raise e + +# Patch 3.2 versions of HTMLParser earlier than 3.2.3 to use some +# 3.2.3 code. This ensures they don't treat markup like

as a +# string. +# +# XXX This code can be removed once most Python 3 users are on 3.2.3. +if major == 3 and minor == 2 and not CONSTRUCTOR_TAKES_STRICT: + import re + attrfind_tolerant = re.compile( + r'\s*((?<=[\'"\s])[^\s/>][^\s/=>]*)(\s*=+\s*' + r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?') + HTMLParserTreeBuilder.attrfind_tolerant = attrfind_tolerant + + locatestarttagend = re.compile(r""" + <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name + (?:\s+ # whitespace before attribute name + (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name + (?:\s*=\s* # value indicator + (?:'[^']*' # LITA-enclosed value + |\"[^\"]*\" # LIT-enclosed value + |[^'\">\s]+ # bare value + ) + )? + ) + )* + \s* # trailing whitespace +""", re.VERBOSE) + BeautifulSoupHTMLParser.locatestarttagend = locatestarttagend + + from html.parser import tagfind, attrfind + + def parse_starttag(self, i): + self.__starttag_text = None + endpos = self.check_for_whole_start_tag(i) + if endpos < 0: + return endpos + rawdata = self.rawdata + self.__starttag_text = rawdata[i:endpos] + + # Now parse the data between i+1 and j into a tag and attrs + attrs = [] + match = tagfind.match(rawdata, i+1) + assert match, 'unexpected call to parse_starttag()' + k = match.end() + self.lasttag = tag = rawdata[i+1:k].lower() + while k < endpos: + if self.strict: + m = attrfind.match(rawdata, k) + else: + m = attrfind_tolerant.match(rawdata, k) + if not m: + break + attrname, rest, attrvalue = m.group(1, 2, 3) + if not rest: + attrvalue = None + elif attrvalue[:1] == '\'' == attrvalue[-1:] or \ + attrvalue[:1] == '"' == attrvalue[-1:]: + attrvalue = attrvalue[1:-1] + if attrvalue: + attrvalue = self.unescape(attrvalue) + attrs.append((attrname.lower(), attrvalue)) + k = m.end() + + end = rawdata[k:endpos].strip() + if end not in (">", "/>"): + lineno, offset = self.getpos() + if "\n" in self.__starttag_text: + lineno = lineno + self.__starttag_text.count("\n") + offset = len(self.__starttag_text) \ + - self.__starttag_text.rfind("\n") + else: + offset = offset + len(self.__starttag_text) + if self.strict: + self.error("junk characters in start tag: %r" + % (rawdata[k:endpos][:20],)) + self.handle_data(rawdata[i:endpos]) + return endpos + if end.endswith('/>'): + # XHTML-style empty tag: + self.handle_startendtag(tag, attrs) + else: + self.handle_starttag(tag, attrs) + if tag in self.CDATA_CONTENT_ELEMENTS: + self.set_cdata_mode(tag) + return endpos + + def set_cdata_mode(self, elem): + self.cdata_elem = elem.lower() + self.interesting = re.compile(r'' % self.cdata_elem, re.I) + + BeautifulSoupHTMLParser.parse_starttag = parse_starttag + BeautifulSoupHTMLParser.set_cdata_mode = set_cdata_mode + + CONSTRUCTOR_TAKES_STRICT = True diff --git a/updater/bs4/builder/_lxml.py b/updater/bs4/builder/_lxml.py new file mode 100644 index 0000000..f718ed1 --- /dev/null +++ b/updater/bs4/builder/_lxml.py @@ -0,0 +1,196 @@ +__all__ = [ + 'LXMLTreeBuilderForXML', + 'LXMLTreeBuilder', + ] + +from StringIO import StringIO +import collections +from lxml import etree +from bs4.element import Comment, Doctype, NamespacedAttribute +from bs4.builder import ( + FAST, + HTML, + HTMLTreeBuilder, + PERMISSIVE, + TreeBuilder, + XML) +from bs4.dammit import UnicodeDammit + +LXML = 'lxml' + +class LXMLTreeBuilderForXML(TreeBuilder): + DEFAULT_PARSER_CLASS = etree.XMLParser + + is_xml = True + + # Well, it's permissive by XML parser standards. + features = [LXML, XML, FAST, PERMISSIVE] + + CHUNK_SIZE = 512 + + # This namespace mapping is specified in the XML Namespace + # standard. + DEFAULT_NSMAPS = {'http://www.w3.org/XML/1998/namespace' : "xml"} + + @property + def default_parser(self): + # This can either return a parser object or a class, which + # will be instantiated with default arguments. + return etree.XMLParser(target=self, strip_cdata=False, recover=True) + + def __init__(self, parser=None, empty_element_tags=None): + if empty_element_tags is not None: + self.empty_element_tags = set(empty_element_tags) + if parser is None: + # Use the default parser. + parser = self.default_parser + if isinstance(parser, collections.Callable): + # Instantiate the parser with default arguments + parser = parser(target=self, strip_cdata=False) + self.parser = parser + self.soup = None + self.nsmaps = [self.DEFAULT_NSMAPS] + + def _getNsTag(self, tag): + # Split the namespace URL out of a fully-qualified lxml tag + # name. Copied from lxml's src/lxml/sax.py. + if tag[0] == '{': + return tuple(tag[1:].split('}', 1)) + else: + return (None, tag) + + def prepare_markup(self, markup, user_specified_encoding=None, + document_declared_encoding=None): + """ + :return: A 3-tuple (markup, original encoding, encoding + declared within markup). + """ + if isinstance(markup, unicode): + return markup, None, None, False + + try_encodings = [user_specified_encoding, document_declared_encoding] + dammit = UnicodeDammit(markup, try_encodings, is_html=True) + return (dammit.markup, dammit.original_encoding, + dammit.declared_html_encoding, + dammit.contains_replacement_characters) + + def feed(self, markup): + if isinstance(markup, basestring): + markup = StringIO(markup) + # Call feed() at least once, even if the markup is empty, + # or the parser won't be initialized. + data = markup.read(self.CHUNK_SIZE) + self.parser.feed(data) + while data != '': + # Now call feed() on the rest of the data, chunk by chunk. + data = markup.read(self.CHUNK_SIZE) + if data != '': + self.parser.feed(data) + self.parser.close() + + def close(self): + self.nsmaps = [self.DEFAULT_NSMAPS] + + def start(self, name, attrs, nsmap={}): + # Make sure attrs is a mutable dict--lxml may send an immutable dictproxy. + attrs = dict(attrs) + nsprefix = None + # Invert each namespace map as it comes in. + if len(self.nsmaps) > 1: + # There are no new namespaces for this tag, but + # non-default namespaces are in play, so we need a + # separate tag stack to know when they end. + self.nsmaps.append(None) + elif len(nsmap) > 0: + # A new namespace mapping has come into play. + inverted_nsmap = dict((value, key) for key, value in nsmap.items()) + self.nsmaps.append(inverted_nsmap) + # Also treat the namespace mapping as a set of attributes on the + # tag, so we can recreate it later. + attrs = attrs.copy() + for prefix, namespace in nsmap.items(): + attribute = NamespacedAttribute( + "xmlns", prefix, "http://www.w3.org/2000/xmlns/") + attrs[attribute] = namespace + + # Namespaces are in play. Find any attributes that came in + # from lxml with namespaces attached to their names, and + # turn then into NamespacedAttribute objects. + new_attrs = {} + for attr, value in attrs.items(): + namespace, attr = self._getNsTag(attr) + if namespace is None: + new_attrs[attr] = value + else: + nsprefix = self._prefix_for_namespace(namespace) + attr = NamespacedAttribute(nsprefix, attr, namespace) + new_attrs[attr] = value + attrs = new_attrs + + namespace, name = self._getNsTag(name) + nsprefix = self._prefix_for_namespace(namespace) + self.soup.handle_starttag(name, namespace, nsprefix, attrs) + + def _prefix_for_namespace(self, namespace): + """Find the currently active prefix for the given namespace.""" + if namespace is None: + return None + for inverted_nsmap in reversed(self.nsmaps): + if inverted_nsmap is not None and namespace in inverted_nsmap: + return inverted_nsmap[namespace] + return None + + def end(self, name): + self.soup.endData() + completed_tag = self.soup.tagStack[-1] + namespace, name = self._getNsTag(name) + nsprefix = None + if namespace is not None: + for inverted_nsmap in reversed(self.nsmaps): + if inverted_nsmap is not None and namespace in inverted_nsmap: + nsprefix = inverted_nsmap[namespace] + break + self.soup.handle_endtag(name, nsprefix) + if len(self.nsmaps) > 1: + # This tag, or one of its parents, introduced a namespace + # mapping, so pop it off the stack. + self.nsmaps.pop() + + def pi(self, target, data): + pass + + def data(self, content): + self.soup.handle_data(content) + + def doctype(self, name, pubid, system): + self.soup.endData() + doctype = Doctype.for_name_and_ids(name, pubid, system) + self.soup.object_was_parsed(doctype) + + def comment(self, content): + "Handle comments as Comment objects." + self.soup.endData() + self.soup.handle_data(content) + self.soup.endData(Comment) + + def test_fragment_to_document(self, fragment): + """See `TreeBuilder`.""" + return u'\n%s' % fragment + + +class LXMLTreeBuilder(HTMLTreeBuilder, LXMLTreeBuilderForXML): + + features = [LXML, HTML, FAST, PERMISSIVE] + is_xml = False + + @property + def default_parser(self): + return etree.HTMLParser + + def feed(self, markup): + self.parser.feed(markup) + self.parser.close() + + def test_fragment_to_document(self, fragment): + """See `TreeBuilder`.""" + return u'%s' % fragment diff --git a/updater/bs4/dammit.py b/updater/bs4/dammit.py new file mode 100644 index 0000000..c199cd5 --- /dev/null +++ b/updater/bs4/dammit.py @@ -0,0 +1,802 @@ +# -*- coding: utf-8 -*- +"""Beautiful Soup bonus library: Unicode, Dammit + +This class forces XML data into a standard format (usually to UTF-8 or +Unicode). It is heavily based on code from Mark Pilgrim's Universal +Feed Parser. It does not rewrite the XML or HTML to reflect a new +encoding; that's the tree builder's job. +""" + +import codecs +from htmlentitydefs import codepoint2name +import re +import logging + +# Import a library to autodetect character encodings. +chardet_type = None +try: + # First try the fast C implementation. + # PyPI package: cchardet + import cchardet + def chardet_dammit(s): + return cchardet.detect(s)['encoding'] +except ImportError: + try: + # Fall back to the pure Python implementation + # Debian package: python-chardet + # PyPI package: chardet + import chardet + def chardet_dammit(s): + return chardet.detect(s)['encoding'] + #import chardet.constants + #chardet.constants._debug = 1 + except ImportError: + # No chardet available. + def chardet_dammit(s): + return None + +# Available from http://cjkpython.i18n.org/. +try: + import iconv_codec +except ImportError: + pass + +xml_encoding_re = re.compile( + '^<\?.*encoding=[\'"](.*?)[\'"].*\?>'.encode(), re.I) +html_meta_re = re.compile( + '<\s*meta[^>]+charset\s*=\s*["\']?([^>]*?)[ /;\'">]'.encode(), re.I) + +class EntitySubstitution(object): + + """Substitute XML or HTML entities for the corresponding characters.""" + + def _populate_class_variables(): + lookup = {} + reverse_lookup = {} + characters_for_re = [] + for codepoint, name in list(codepoint2name.items()): + character = unichr(codepoint) + if codepoint != 34: + # There's no point in turning the quotation mark into + # ", unless it happens within an attribute value, which + # is handled elsewhere. + characters_for_re.append(character) + lookup[character] = name + # But we do want to turn " into the quotation mark. + reverse_lookup[name] = character + re_definition = "[%s]" % "".join(characters_for_re) + return lookup, reverse_lookup, re.compile(re_definition) + (CHARACTER_TO_HTML_ENTITY, HTML_ENTITY_TO_CHARACTER, + CHARACTER_TO_HTML_ENTITY_RE) = _populate_class_variables() + + CHARACTER_TO_XML_ENTITY = { + "'": "apos", + '"': "quot", + "&": "amp", + "<": "lt", + ">": "gt", + } + + BARE_AMPERSAND_OR_BRACKET = re.compile("([<>]|" + "&(?!#\d+;|#x[0-9a-fA-F]+;|\w+;)" + ")") + + @classmethod + def _substitute_html_entity(cls, matchobj): + entity = cls.CHARACTER_TO_HTML_ENTITY.get(matchobj.group(0)) + return "&%s;" % entity + + @classmethod + def _substitute_xml_entity(cls, matchobj): + """Used with a regular expression to substitute the + appropriate XML entity for an XML special character.""" + entity = cls.CHARACTER_TO_XML_ENTITY[matchobj.group(0)] + return "&%s;" % entity + + @classmethod + def quoted_attribute_value(self, value): + """Make a value into a quoted XML attribute, possibly escaping it. + + Most strings will be quoted using double quotes. + + Bob's Bar -> "Bob's Bar" + + If a string contains double quotes, it will be quoted using + single quotes. + + Welcome to "my bar" -> 'Welcome to "my bar"' + + If a string contains both single and double quotes, the + double quotes will be escaped, and the string will be quoted + using double quotes. + + Welcome to "Bob's Bar" -> "Welcome to "Bob's bar" + """ + quote_with = '"' + if '"' in value: + if "'" in value: + # The string contains both single and double + # quotes. Turn the double quotes into + # entities. We quote the double quotes rather than + # the single quotes because the entity name is + # """ whether this is HTML or XML. If we + # quoted the single quotes, we'd have to decide + # between ' and &squot;. + replace_with = """ + value = value.replace('"', replace_with) + else: + # There are double quotes but no single quotes. + # We can use single quotes to quote the attribute. + quote_with = "'" + return quote_with + value + quote_with + + @classmethod + def substitute_xml(cls, value, make_quoted_attribute=False): + """Substitute XML entities for special XML characters. + + :param value: A string to be substituted. The less-than sign will + become <, the greater-than sign will become >, and any + ampersands that are not part of an entity defition will + become &. + + :param make_quoted_attribute: If True, then the string will be + quoted, as befits an attribute value. + """ + # Escape angle brackets, and ampersands that aren't part of + # entities. + value = cls.BARE_AMPERSAND_OR_BRACKET.sub( + cls._substitute_xml_entity, value) + + if make_quoted_attribute: + value = cls.quoted_attribute_value(value) + return value + + @classmethod + def substitute_html(cls, s): + """Replace certain Unicode characters with named HTML entities. + + This differs from data.encode(encoding, 'xmlcharrefreplace') + in that the goal is to make the result more readable (to those + with ASCII displays) rather than to recover from + errors. There's absolutely nothing wrong with a UTF-8 string + containg a LATIN SMALL LETTER E WITH ACUTE, but replacing that + character with "é" will make it more readable to some + people. + """ + return cls.CHARACTER_TO_HTML_ENTITY_RE.sub( + cls._substitute_html_entity, s) + + +class UnicodeDammit: + """A class for detecting the encoding of a *ML document and + converting it to a Unicode string. If the source encoding is + windows-1252, can replace MS smart quotes with their HTML or XML + equivalents.""" + + # This dictionary maps commonly seen values for "charset" in HTML + # meta tags to the corresponding Python codec names. It only covers + # values that aren't in Python's aliases and can't be determined + # by the heuristics in find_codec. + CHARSET_ALIASES = {"macintosh": "mac-roman", + "x-sjis": "shift-jis"} + + ENCODINGS_WITH_SMART_QUOTES = [ + "windows-1252", + "iso-8859-1", + "iso-8859-2", + ] + + def __init__(self, markup, override_encodings=[], + smart_quotes_to=None, is_html=False): + self.declared_html_encoding = None + self.smart_quotes_to = smart_quotes_to + self.tried_encodings = [] + self.contains_replacement_characters = False + + if markup == '' or isinstance(markup, unicode): + self.markup = markup + self.unicode_markup = unicode(markup) + self.original_encoding = None + return + + new_markup, document_encoding, sniffed_encoding = \ + self._detectEncoding(markup, is_html) + self.markup = new_markup + + u = None + if new_markup != markup: + # _detectEncoding modified the markup, then converted it to + # Unicode and then to UTF-8. So convert it from UTF-8. + u = self._convert_from("utf8") + self.original_encoding = sniffed_encoding + + if not u: + for proposed_encoding in ( + override_encodings + [document_encoding, sniffed_encoding]): + if proposed_encoding is not None: + u = self._convert_from(proposed_encoding) + if u: + break + + # If no luck and we have auto-detection library, try that: + if not u and not isinstance(self.markup, unicode): + u = self._convert_from(chardet_dammit(self.markup)) + + # As a last resort, try utf-8 and windows-1252: + if not u: + for proposed_encoding in ("utf-8", "windows-1252"): + u = self._convert_from(proposed_encoding) + if u: + break + + # As an absolute last resort, try the encodings again with + # character replacement. + if not u: + for proposed_encoding in ( + override_encodings + [ + document_encoding, sniffed_encoding, "utf-8", "windows-1252"]): + if proposed_encoding != "ascii": + u = self._convert_from(proposed_encoding, "replace") + if u is not None: + logging.warning( + "Some characters could not be decoded, and were " + "replaced with REPLACEMENT CHARACTER.") + self.contains_replacement_characters = True + break + + # We could at this point force it to ASCII, but that would + # destroy so much data that I think giving up is better + self.unicode_markup = u + if not u: + self.original_encoding = None + + def _sub_ms_char(self, match): + """Changes a MS smart quote character to an XML or HTML + entity, or an ASCII character.""" + orig = match.group(1) + if self.smart_quotes_to == 'ascii': + sub = self.MS_CHARS_TO_ASCII.get(orig).encode() + else: + sub = self.MS_CHARS.get(orig) + if type(sub) == tuple: + if self.smart_quotes_to == 'xml': + sub = '&#x'.encode() + sub[1].encode() + ';'.encode() + else: + sub = '&'.encode() + sub[0].encode() + ';'.encode() + else: + sub = sub.encode() + return sub + + def _convert_from(self, proposed, errors="strict"): + proposed = self.find_codec(proposed) + if not proposed or (proposed, errors) in self.tried_encodings: + return None + self.tried_encodings.append((proposed, errors)) + markup = self.markup + # Convert smart quotes to HTML if coming from an encoding + # that might have them. + if (self.smart_quotes_to is not None + and proposed.lower() in self.ENCODINGS_WITH_SMART_QUOTES): + smart_quotes_re = b"([\x80-\x9f])" + smart_quotes_compiled = re.compile(smart_quotes_re) + markup = smart_quotes_compiled.sub(self._sub_ms_char, markup) + + try: + #print "Trying to convert document to %s (errors=%s)" % ( + # proposed, errors) + u = self._to_unicode(markup, proposed, errors) + self.markup = u + self.original_encoding = proposed + except Exception as e: + #print "That didn't work!" + #print e + return None + #print "Correct encoding: %s" % proposed + return self.markup + + def _to_unicode(self, data, encoding, errors="strict"): + '''Given a string and its encoding, decodes the string into Unicode. + %encoding is a string recognized by encodings.aliases''' + + # strip Byte Order Mark (if present) + if (len(data) >= 4) and (data[:2] == '\xfe\xff') \ + and (data[2:4] != '\x00\x00'): + encoding = 'utf-16be' + data = data[2:] + elif (len(data) >= 4) and (data[:2] == '\xff\xfe') \ + and (data[2:4] != '\x00\x00'): + encoding = 'utf-16le' + data = data[2:] + elif data[:3] == '\xef\xbb\xbf': + encoding = 'utf-8' + data = data[3:] + elif data[:4] == '\x00\x00\xfe\xff': + encoding = 'utf-32be' + data = data[4:] + elif data[:4] == '\xff\xfe\x00\x00': + encoding = 'utf-32le' + data = data[4:] + newdata = unicode(data, encoding, errors) + return newdata + + def _detectEncoding(self, xml_data, is_html=False): + """Given a document, tries to detect its XML encoding.""" + xml_encoding = sniffed_xml_encoding = None + try: + if xml_data[:4] == b'\x4c\x6f\xa7\x94': + # EBCDIC + xml_data = self._ebcdic_to_ascii(xml_data) + elif xml_data[:4] == b'\x00\x3c\x00\x3f': + # UTF-16BE + sniffed_xml_encoding = 'utf-16be' + xml_data = unicode(xml_data, 'utf-16be').encode('utf-8') + elif (len(xml_data) >= 4) and (xml_data[:2] == b'\xfe\xff') \ + and (xml_data[2:4] != b'\x00\x00'): + # UTF-16BE with BOM + sniffed_xml_encoding = 'utf-16be' + xml_data = unicode(xml_data[2:], 'utf-16be').encode('utf-8') + elif xml_data[:4] == b'\x3c\x00\x3f\x00': + # UTF-16LE + sniffed_xml_encoding = 'utf-16le' + xml_data = unicode(xml_data, 'utf-16le').encode('utf-8') + elif (len(xml_data) >= 4) and (xml_data[:2] == b'\xff\xfe') and \ + (xml_data[2:4] != b'\x00\x00'): + # UTF-16LE with BOM + sniffed_xml_encoding = 'utf-16le' + xml_data = unicode(xml_data[2:], 'utf-16le').encode('utf-8') + elif xml_data[:4] == b'\x00\x00\x00\x3c': + # UTF-32BE + sniffed_xml_encoding = 'utf-32be' + xml_data = unicode(xml_data, 'utf-32be').encode('utf-8') + elif xml_data[:4] == b'\x3c\x00\x00\x00': + # UTF-32LE + sniffed_xml_encoding = 'utf-32le' + xml_data = unicode(xml_data, 'utf-32le').encode('utf-8') + elif xml_data[:4] == b'\x00\x00\xfe\xff': + # UTF-32BE with BOM + sniffed_xml_encoding = 'utf-32be' + xml_data = unicode(xml_data[4:], 'utf-32be').encode('utf-8') + elif xml_data[:4] == b'\xff\xfe\x00\x00': + # UTF-32LE with BOM + sniffed_xml_encoding = 'utf-32le' + xml_data = unicode(xml_data[4:], 'utf-32le').encode('utf-8') + elif xml_data[:3] == b'\xef\xbb\xbf': + # UTF-8 with BOM + sniffed_xml_encoding = 'utf-8' + xml_data = unicode(xml_data[3:], 'utf-8').encode('utf-8') + else: + sniffed_xml_encoding = 'ascii' + pass + except: + xml_encoding_match = None + xml_encoding_match = xml_encoding_re.match(xml_data) + if not xml_encoding_match and is_html: + xml_encoding_match = html_meta_re.search(xml_data) + if xml_encoding_match is not None: + xml_encoding = xml_encoding_match.groups()[0].decode( + 'ascii').lower() + if is_html: + self.declared_html_encoding = xml_encoding + if sniffed_xml_encoding and \ + (xml_encoding in ('iso-10646-ucs-2', 'ucs-2', 'csunicode', + 'iso-10646-ucs-4', 'ucs-4', 'csucs4', + 'utf-16', 'utf-32', 'utf_16', 'utf_32', + 'utf16', 'u16')): + xml_encoding = sniffed_xml_encoding + return xml_data, xml_encoding, sniffed_xml_encoding + + def find_codec(self, charset): + return self._codec(self.CHARSET_ALIASES.get(charset, charset)) \ + or (charset and self._codec(charset.replace("-", ""))) \ + or (charset and self._codec(charset.replace("-", "_"))) \ + or charset + + def _codec(self, charset): + if not charset: + return charset + codec = None + try: + codecs.lookup(charset) + codec = charset + except (LookupError, ValueError): + pass + return codec + + EBCDIC_TO_ASCII_MAP = None + + def _ebcdic_to_ascii(self, s): + c = self.__class__ + if not c.EBCDIC_TO_ASCII_MAP: + emap = (0,1,2,3,156,9,134,127,151,141,142,11,12,13,14,15, + 16,17,18,19,157,133,8,135,24,25,146,143,28,29,30,31, + 128,129,130,131,132,10,23,27,136,137,138,139,140,5,6,7, + 144,145,22,147,148,149,150,4,152,153,154,155,20,21,158,26, + 32,160,161,162,163,164,165,166,167,168,91,46,60,40,43,33, + 38,169,170,171,172,173,174,175,176,177,93,36,42,41,59,94, + 45,47,178,179,180,181,182,183,184,185,124,44,37,95,62,63, + 186,187,188,189,190,191,192,193,194,96,58,35,64,39,61,34, + 195,97,98,99,100,101,102,103,104,105,196,197,198,199,200, + 201,202,106,107,108,109,110,111,112,113,114,203,204,205, + 206,207,208,209,126,115,116,117,118,119,120,121,122,210, + 211,212,213,214,215,216,217,218,219,220,221,222,223,224, + 225,226,227,228,229,230,231,123,65,66,67,68,69,70,71,72, + 73,232,233,234,235,236,237,125,74,75,76,77,78,79,80,81, + 82,238,239,240,241,242,243,92,159,83,84,85,86,87,88,89, + 90,244,245,246,247,248,249,48,49,50,51,52,53,54,55,56,57, + 250,251,252,253,254,255) + import string + c.EBCDIC_TO_ASCII_MAP = string.maketrans( + ''.join(map(chr, list(range(256)))), ''.join(map(chr, emap))) + return s.translate(c.EBCDIC_TO_ASCII_MAP) + + # A partial mapping of ISO-Latin-1 to HTML entities/XML numeric entities. + MS_CHARS = {b'\x80': ('euro', '20AC'), + b'\x81': ' ', + b'\x82': ('sbquo', '201A'), + b'\x83': ('fnof', '192'), + b'\x84': ('bdquo', '201E'), + b'\x85': ('hellip', '2026'), + b'\x86': ('dagger', '2020'), + b'\x87': ('Dagger', '2021'), + b'\x88': ('circ', '2C6'), + b'\x89': ('permil', '2030'), + b'\x8A': ('Scaron', '160'), + b'\x8B': ('lsaquo', '2039'), + b'\x8C': ('OElig', '152'), + b'\x8D': '?', + b'\x8E': ('#x17D', '17D'), + b'\x8F': '?', + b'\x90': '?', + b'\x91': ('lsquo', '2018'), + b'\x92': ('rsquo', '2019'), + b'\x93': ('ldquo', '201C'), + b'\x94': ('rdquo', '201D'), + b'\x95': ('bull', '2022'), + b'\x96': ('ndash', '2013'), + b'\x97': ('mdash', '2014'), + b'\x98': ('tilde', '2DC'), + b'\x99': ('trade', '2122'), + b'\x9a': ('scaron', '161'), + b'\x9b': ('rsaquo', '203A'), + b'\x9c': ('oelig', '153'), + b'\x9d': '?', + b'\x9e': ('#x17E', '17E'), + b'\x9f': ('Yuml', ''),} + + # A parochial partial mapping of ISO-Latin-1 to ASCII. Contains + # horrors like stripping diacritical marks to turn á into a, but also + # contains non-horrors like turning “ into ". + MS_CHARS_TO_ASCII = { + b'\x80' : 'EUR', + b'\x81' : ' ', + b'\x82' : ',', + b'\x83' : 'f', + b'\x84' : ',,', + b'\x85' : '...', + b'\x86' : '+', + b'\x87' : '++', + b'\x88' : '^', + b'\x89' : '%', + b'\x8a' : 'S', + b'\x8b' : '<', + b'\x8c' : 'OE', + b'\x8d' : '?', + b'\x8e' : 'Z', + b'\x8f' : '?', + b'\x90' : '?', + b'\x91' : "'", + b'\x92' : "'", + b'\x93' : '"', + b'\x94' : '"', + b'\x95' : '*', + b'\x96' : '-', + b'\x97' : '--', + b'\x98' : '~', + b'\x99' : '(TM)', + b'\x9a' : 's', + b'\x9b' : '>', + b'\x9c' : 'oe', + b'\x9d' : '?', + b'\x9e' : 'z', + b'\x9f' : 'Y', + b'\xa0' : ' ', + b'\xa1' : '!', + b'\xa2' : 'c', + b'\xa3' : 'GBP', + b'\xa4' : '$', #This approximation is especially parochial--this is the + #generic currency symbol. + b'\xa5' : 'YEN', + b'\xa6' : '|', + b'\xa7' : 'S', + b'\xa8' : '..', + b'\xa9' : '', + b'\xaa' : '(th)', + b'\xab' : '<<', + b'\xac' : '!', + b'\xad' : ' ', + b'\xae' : '(R)', + b'\xaf' : '-', + b'\xb0' : 'o', + b'\xb1' : '+-', + b'\xb2' : '2', + b'\xb3' : '3', + b'\xb4' : ("'", 'acute'), + b'\xb5' : 'u', + b'\xb6' : 'P', + b'\xb7' : '*', + b'\xb8' : ',', + b'\xb9' : '1', + b'\xba' : '(th)', + b'\xbb' : '>>', + b'\xbc' : '1/4', + b'\xbd' : '1/2', + b'\xbe' : '3/4', + b'\xbf' : '?', + b'\xc0' : 'A', + b'\xc1' : 'A', + b'\xc2' : 'A', + b'\xc3' : 'A', + b'\xc4' : 'A', + b'\xc5' : 'A', + b'\xc6' : 'AE', + b'\xc7' : 'C', + b'\xc8' : 'E', + b'\xc9' : 'E', + b'\xca' : 'E', + b'\xcb' : 'E', + b'\xcc' : 'I', + b'\xcd' : 'I', + b'\xce' : 'I', + b'\xcf' : 'I', + b'\xd0' : 'D', + b'\xd1' : 'N', + b'\xd2' : 'O', + b'\xd3' : 'O', + b'\xd4' : 'O', + b'\xd5' : 'O', + b'\xd6' : 'O', + b'\xd7' : '*', + b'\xd8' : 'O', + b'\xd9' : 'U', + b'\xda' : 'U', + b'\xdb' : 'U', + b'\xdc' : 'U', + b'\xdd' : 'Y', + b'\xde' : 'b', + b'\xdf' : 'B', + b'\xe0' : 'a', + b'\xe1' : 'a', + b'\xe2' : 'a', + b'\xe3' : 'a', + b'\xe4' : 'a', + b'\xe5' : 'a', + b'\xe6' : 'ae', + b'\xe7' : 'c', + b'\xe8' : 'e', + b'\xe9' : 'e', + b'\xea' : 'e', + b'\xeb' : 'e', + b'\xec' : 'i', + b'\xed' : 'i', + b'\xee' : 'i', + b'\xef' : 'i', + b'\xf0' : 'o', + b'\xf1' : 'n', + b'\xf2' : 'o', + b'\xf3' : 'o', + b'\xf4' : 'o', + b'\xf5' : 'o', + b'\xf6' : 'o', + b'\xf7' : '/', + b'\xf8' : 'o', + b'\xf9' : 'u', + b'\xfa' : 'u', + b'\xfb' : 'u', + b'\xfc' : 'u', + b'\xfd' : 'y', + b'\xfe' : 'b', + b'\xff' : 'y', + } + + # A map used when removing rogue Windows-1252/ISO-8859-1 + # characters in otherwise UTF-8 documents. + # + # Note that \x81, \x8d, \x8f, \x90, and \x9d are undefined in + # Windows-1252. + WINDOWS_1252_TO_UTF8 = { + 0x80 : b'\xe2\x82\xac', # € + 0x82 : b'\xe2\x80\x9a', # ‚ + 0x83 : b'\xc6\x92', # ƒ + 0x84 : b'\xe2\x80\x9e', # „ + 0x85 : b'\xe2\x80\xa6', # … + 0x86 : b'\xe2\x80\xa0', # † + 0x87 : b'\xe2\x80\xa1', # ‡ + 0x88 : b'\xcb\x86', # ˆ + 0x89 : b'\xe2\x80\xb0', # ‰ + 0x8a : b'\xc5\xa0', # Š + 0x8b : b'\xe2\x80\xb9', # ‹ + 0x8c : b'\xc5\x92', # Œ + 0x8e : b'\xc5\xbd', # Ž + 0x91 : b'\xe2\x80\x98', # ‘ + 0x92 : b'\xe2\x80\x99', # ’ + 0x93 : b'\xe2\x80\x9c', # “ + 0x94 : b'\xe2\x80\x9d', # ” + 0x95 : b'\xe2\x80\xa2', # • + 0x96 : b'\xe2\x80\x93', # – + 0x97 : b'\xe2\x80\x94', # — + 0x98 : b'\xcb\x9c', # ˜ + 0x99 : b'\xe2\x84\xa2', # ™ + 0x9a : b'\xc5\xa1', # š + 0x9b : b'\xe2\x80\xba', # › + 0x9c : b'\xc5\x93', # œ + 0x9e : b'\xc5\xbe', # ž + 0x9f : b'\xc5\xb8', # Ÿ + 0xa0 : b'\xc2\xa0', #   + 0xa1 : b'\xc2\xa1', # ¡ + 0xa2 : b'\xc2\xa2', # ¢ + 0xa3 : b'\xc2\xa3', # £ + 0xa4 : b'\xc2\xa4', # ¤ + 0xa5 : b'\xc2\xa5', # ¥ + 0xa6 : b'\xc2\xa6', # ¦ + 0xa7 : b'\xc2\xa7', # § + 0xa8 : b'\xc2\xa8', # ¨ + 0xa9 : b'\xc2\xa9', # © + 0xaa : b'\xc2\xaa', # ª + 0xab : b'\xc2\xab', # « + 0xac : b'\xc2\xac', # ¬ + 0xad : b'\xc2\xad', # ­ + 0xae : b'\xc2\xae', # ® + 0xaf : b'\xc2\xaf', # ¯ + 0xb0 : b'\xc2\xb0', # ° + 0xb1 : b'\xc2\xb1', # ± + 0xb2 : b'\xc2\xb2', # ² + 0xb3 : b'\xc2\xb3', # ³ + 0xb4 : b'\xc2\xb4', # ´ + 0xb5 : b'\xc2\xb5', # µ + 0xb6 : b'\xc2\xb6', # ¶ + 0xb7 : b'\xc2\xb7', # · + 0xb8 : b'\xc2\xb8', # ¸ + 0xb9 : b'\xc2\xb9', # ¹ + 0xba : b'\xc2\xba', # º + 0xbb : b'\xc2\xbb', # » + 0xbc : b'\xc2\xbc', # ¼ + 0xbd : b'\xc2\xbd', # ½ + 0xbe : b'\xc2\xbe', # ¾ + 0xbf : b'\xc2\xbf', # ¿ + 0xc0 : b'\xc3\x80', # À + 0xc1 : b'\xc3\x81', # Á + 0xc2 : b'\xc3\x82', #  + 0xc3 : b'\xc3\x83', # à + 0xc4 : b'\xc3\x84', # Ä + 0xc5 : b'\xc3\x85', # Å + 0xc6 : b'\xc3\x86', # Æ + 0xc7 : b'\xc3\x87', # Ç + 0xc8 : b'\xc3\x88', # È + 0xc9 : b'\xc3\x89', # É + 0xca : b'\xc3\x8a', # Ê + 0xcb : b'\xc3\x8b', # Ë + 0xcc : b'\xc3\x8c', # Ì + 0xcd : b'\xc3\x8d', # Í + 0xce : b'\xc3\x8e', # Î + 0xcf : b'\xc3\x8f', # Ï + 0xd0 : b'\xc3\x90', # Ð + 0xd1 : b'\xc3\x91', # Ñ + 0xd2 : b'\xc3\x92', # Ò + 0xd3 : b'\xc3\x93', # Ó + 0xd4 : b'\xc3\x94', # Ô + 0xd5 : b'\xc3\x95', # Õ + 0xd6 : b'\xc3\x96', # Ö + 0xd7 : b'\xc3\x97', # × + 0xd8 : b'\xc3\x98', # Ø + 0xd9 : b'\xc3\x99', # Ù + 0xda : b'\xc3\x9a', # Ú + 0xdb : b'\xc3\x9b', # Û + 0xdc : b'\xc3\x9c', # Ü + 0xdd : b'\xc3\x9d', # Ý + 0xde : b'\xc3\x9e', # Þ + 0xdf : b'\xc3\x9f', # ß + 0xe0 : b'\xc3\xa0', # à + 0xe1 : b'\xa1', # á + 0xe2 : b'\xc3\xa2', # â + 0xe3 : b'\xc3\xa3', # ã + 0xe4 : b'\xc3\xa4', # ä + 0xe5 : b'\xc3\xa5', # å + 0xe6 : b'\xc3\xa6', # æ + 0xe7 : b'\xc3\xa7', # ç + 0xe8 : b'\xc3\xa8', # è + 0xe9 : b'\xc3\xa9', # é + 0xea : b'\xc3\xaa', # ê + 0xeb : b'\xc3\xab', # ë + 0xec : b'\xc3\xac', # ì + 0xed : b'\xc3\xad', # í + 0xee : b'\xc3\xae', # î + 0xef : b'\xc3\xaf', # ï + 0xf0 : b'\xc3\xb0', # ð + 0xf1 : b'\xc3\xb1', # ñ + 0xf2 : b'\xc3\xb2', # ò + 0xf3 : b'\xc3\xb3', # ó + 0xf4 : b'\xc3\xb4', # ô + 0xf5 : b'\xc3\xb5', # õ + 0xf6 : b'\xc3\xb6', # ö + 0xf7 : b'\xc3\xb7', # ÷ + 0xf8 : b'\xc3\xb8', # ø + 0xf9 : b'\xc3\xb9', # ù + 0xfa : b'\xc3\xba', # ú + 0xfb : b'\xc3\xbb', # û + 0xfc : b'\xc3\xbc', # ü + 0xfd : b'\xc3\xbd', # ý + 0xfe : b'\xc3\xbe', # þ + } + + MULTIBYTE_MARKERS_AND_SIZES = [ + (0xc2, 0xdf, 2), # 2-byte characters start with a byte C2-DF + (0xe0, 0xef, 3), # 3-byte characters start with E0-EF + (0xf0, 0xf4, 4), # 4-byte characters start with F0-F4 + ] + + FIRST_MULTIBYTE_MARKER = MULTIBYTE_MARKERS_AND_SIZES[0][0] + LAST_MULTIBYTE_MARKER = MULTIBYTE_MARKERS_AND_SIZES[-1][1] + + @classmethod + def detwingle(cls, in_bytes, main_encoding="utf8", + embedded_encoding="windows-1252"): + """Fix characters from one encoding embedded in some other encoding. + + Currently the only situation supported is Windows-1252 (or its + subset ISO-8859-1), embedded in UTF-8. + + The input must be a bytestring. If you've already converted + the document to Unicode, you're too late. + + The output is a bytestring in which `embedded_encoding` + characters have been converted to their `main_encoding` + equivalents. + """ + if embedded_encoding.replace('_', '-').lower() not in ( + 'windows-1252', 'windows_1252'): + raise NotImplementedError( + "Windows-1252 and ISO-8859-1 are the only currently supported " + "embedded encodings.") + + if main_encoding.lower() not in ('utf8', 'utf-8'): + raise NotImplementedError( + "UTF-8 is the only currently supported main encoding.") + + byte_chunks = [] + + chunk_start = 0 + pos = 0 + while pos < len(in_bytes): + byte = in_bytes[pos] + if not isinstance(byte, int): + # Python 2.x + byte = ord(byte) + if (byte >= cls.FIRST_MULTIBYTE_MARKER + and byte <= cls.LAST_MULTIBYTE_MARKER): + # This is the start of a UTF-8 multibyte character. Skip + # to the end. + for start, end, size in cls.MULTIBYTE_MARKERS_AND_SIZES: + if byte >= start and byte <= end: + pos += size + break + elif byte >= 0x80 and byte in cls.WINDOWS_1252_TO_UTF8: + # We found a Windows-1252 character! + # Save the string up to this point as a chunk. + byte_chunks.append(in_bytes[chunk_start:pos]) + + # Now translate the Windows-1252 character into UTF-8 + # and add it as another, one-byte chunk. + byte_chunks.append(cls.WINDOWS_1252_TO_UTF8[byte]) + pos += 1 + chunk_start = pos + else: + # Go on to the next character. + pos += 1 + if chunk_start == 0: + # The string is unchanged. + return in_bytes + else: + # Store the final chunk. + byte_chunks.append(in_bytes[chunk_start:]) + return b''.join(byte_chunks) + diff --git a/updater/bs4/element.py b/updater/bs4/element.py new file mode 100644 index 0000000..5989809 --- /dev/null +++ b/updater/bs4/element.py @@ -0,0 +1,1384 @@ +import collections +import re +import sys +import warnings +from bs4.dammit import EntitySubstitution + +DEFAULT_OUTPUT_ENCODING = "utf-8" +PY3K = (sys.version_info[0] > 2) + +whitespace_re = re.compile("\s+") + +def _alias(attr): + """Alias one attribute name to another for backward compatibility""" + @property + def alias(self): + return getattr(self, attr) + + @alias.setter + def alias(self): + return setattr(self, attr) + return alias + + +class NamespacedAttribute(unicode): + + def __new__(cls, prefix, name, namespace=None): + if name is None: + obj = unicode.__new__(cls, prefix) + elif prefix is None: + # Not really namespaced. + obj = unicode.__new__(cls, name) + else: + obj = unicode.__new__(cls, prefix + ":" + name) + obj.prefix = prefix + obj.name = name + obj.namespace = namespace + return obj + +class AttributeValueWithCharsetSubstitution(unicode): + """A stand-in object for a character encoding specified in HTML.""" + +class CharsetMetaAttributeValue(AttributeValueWithCharsetSubstitution): + """A generic stand-in for the value of a meta tag's 'charset' attribute. + + When Beautiful Soup parses the markup '', the + value of the 'charset' attribute will be one of these objects. + """ + + def __new__(cls, original_value): + obj = unicode.__new__(cls, original_value) + obj.original_value = original_value + return obj + + def encode(self, encoding): + return encoding + + +class ContentMetaAttributeValue(AttributeValueWithCharsetSubstitution): + """A generic stand-in for the value of a meta tag's 'content' attribute. + + When Beautiful Soup parses the markup: + + + The value of the 'content' attribute will be one of these objects. + """ + + CHARSET_RE = re.compile("((^|;)\s*charset=)([^;]*)", re.M) + + def __new__(cls, original_value): + match = cls.CHARSET_RE.search(original_value) + if match is None: + # No substitution necessary. + return unicode.__new__(unicode, original_value) + + obj = unicode.__new__(cls, original_value) + obj.original_value = original_value + return obj + + def encode(self, encoding): + def rewrite(match): + return match.group(1) + encoding + return self.CHARSET_RE.sub(rewrite, self.original_value) + + +class PageElement(object): + """Contains the navigational information for some part of the page + (either a tag or a piece of text)""" + + # There are five possible values for the "formatter" argument passed in + # to methods like encode() and prettify(): + # + # "html" - All Unicode characters with corresponding HTML entities + # are converted to those entities on output. + # "minimal" - Bare ampersands and angle brackets are converted to + # XML entities: & < > + # None - The null formatter. Unicode characters are never + # converted to entities. This is not recommended, but it's + # faster than "minimal". + # A function - This function will be called on every string that + # needs to undergo entity substition + FORMATTERS = { + "html" : EntitySubstitution.substitute_html, + "minimal" : EntitySubstitution.substitute_xml, + None : None + } + + @classmethod + def format_string(self, s, formatter='minimal'): + """Format the given string using the given formatter.""" + if not callable(formatter): + formatter = self.FORMATTERS.get( + formatter, EntitySubstitution.substitute_xml) + if formatter is None: + output = s + else: + output = formatter(s) + return output + + def setup(self, parent=None, previous_element=None): + """Sets up the initial relations between this element and + other elements.""" + self.parent = parent + self.previous_element = previous_element + if previous_element is not None: + self.previous_element.next_element = self + self.next_element = None + self.previous_sibling = None + self.next_sibling = None + if self.parent is not None and self.parent.contents: + self.previous_sibling = self.parent.contents[-1] + self.previous_sibling.next_sibling = self + + nextSibling = _alias("next_sibling") # BS3 + previousSibling = _alias("previous_sibling") # BS3 + + def replace_with(self, replace_with): + if replace_with is self: + return + if replace_with is self.parent: + raise ValueError("Cannot replace a Tag with its parent.") + old_parent = self.parent + my_index = self.parent.index(self) + self.extract() + old_parent.insert(my_index, replace_with) + return self + replaceWith = replace_with # BS3 + + def unwrap(self): + my_parent = self.parent + my_index = self.parent.index(self) + self.extract() + for child in reversed(self.contents[:]): + my_parent.insert(my_index, child) + return self + replace_with_children = unwrap + replaceWithChildren = unwrap # BS3 + + def wrap(self, wrap_inside): + me = self.replace_with(wrap_inside) + wrap_inside.append(me) + return wrap_inside + + def extract(self): + """Destructively rips this element out of the tree.""" + if self.parent is not None: + del self.parent.contents[self.parent.index(self)] + + #Find the two elements that would be next to each other if + #this element (and any children) hadn't been parsed. Connect + #the two. + last_child = self._last_descendant() + next_element = last_child.next_element + + if self.previous_element is not None: + self.previous_element.next_element = next_element + if next_element is not None: + next_element.previous_element = self.previous_element + self.previous_element = None + last_child.next_element = None + + self.parent = None + if self.previous_sibling is not None: + self.previous_sibling.next_sibling = self.next_sibling + if self.next_sibling is not None: + self.next_sibling.previous_sibling = self.previous_sibling + self.previous_sibling = self.next_sibling = None + return self + + def _last_descendant(self): + "Finds the last element beneath this object to be parsed." + last_child = self + while hasattr(last_child, 'contents') and last_child.contents: + last_child = last_child.contents[-1] + return last_child + # BS3: Not part of the API! + _lastRecursiveChild = _last_descendant + + def insert(self, position, new_child): + if new_child is self: + raise ValueError("Cannot insert a tag into itself.") + if (isinstance(new_child, basestring) + and not isinstance(new_child, NavigableString)): + new_child = NavigableString(new_child) + + position = min(position, len(self.contents)) + if hasattr(new_child, 'parent') and new_child.parent is not None: + # We're 'inserting' an element that's already one + # of this object's children. + if new_child.parent is self: + current_index = self.index(new_child) + if current_index < position: + # We're moving this element further down the list + # of this object's children. That means that when + # we extract this element, our target index will + # jump down one. + position -= 1 + new_child.extract() + + new_child.parent = self + previous_child = None + if position == 0: + new_child.previous_sibling = None + new_child.previous_element = self + else: + previous_child = self.contents[position - 1] + new_child.previous_sibling = previous_child + new_child.previous_sibling.next_sibling = new_child + new_child.previous_element = previous_child._last_descendant() + if new_child.previous_element is not None: + new_child.previous_element.next_element = new_child + + new_childs_last_element = new_child._last_descendant() + + if position >= len(self.contents): + new_child.next_sibling = None + + parent = self + parents_next_sibling = None + while parents_next_sibling is None and parent is not None: + parents_next_sibling = parent.next_sibling + parent = parent.parent + if parents_next_sibling is not None: + # We found the element that comes next in the document. + break + if parents_next_sibling is not None: + new_childs_last_element.next_element = parents_next_sibling + else: + # The last element of this tag is the last element in + # the document. + new_childs_last_element.next_element = None + else: + next_child = self.contents[position] + new_child.next_sibling = next_child + if new_child.next_sibling is not None: + new_child.next_sibling.previous_sibling = new_child + new_childs_last_element.next_element = next_child + + if new_childs_last_element.next_element is not None: + new_childs_last_element.next_element.previous_element = new_childs_last_element + self.contents.insert(position, new_child) + + def append(self, tag): + """Appends the given tag to the contents of this tag.""" + self.insert(len(self.contents), tag) + + def insert_before(self, predecessor): + """Makes the given element the immediate predecessor of this one. + + The two elements will have the same parent, and the given element + will be immediately before this one. + """ + if self is predecessor: + raise ValueError("Can't insert an element before itself.") + parent = self.parent + if parent is None: + raise ValueError( + "Element has no parent, so 'before' has no meaning.") + # Extract first so that the index won't be screwed up if they + # are siblings. + if isinstance(predecessor, PageElement): + predecessor.extract() + index = parent.index(self) + parent.insert(index, predecessor) + + def insert_after(self, successor): + """Makes the given element the immediate successor of this one. + + The two elements will have the same parent, and the given element + will be immediately after this one. + """ + if self is successor: + raise ValueError("Can't insert an element after itself.") + parent = self.parent + if parent is None: + raise ValueError( + "Element has no parent, so 'after' has no meaning.") + # Extract first so that the index won't be screwed up if they + # are siblings. + if isinstance(successor, PageElement): + successor.extract() + index = parent.index(self) + parent.insert(index+1, successor) + + def find_next(self, name=None, attrs={}, text=None, **kwargs): + """Returns the first item that matches the given criteria and + appears after this Tag in the document.""" + return self._find_one(self.find_all_next, name, attrs, text, **kwargs) + findNext = find_next # BS3 + + def find_all_next(self, name=None, attrs={}, text=None, limit=None, + **kwargs): + """Returns all items that match the given criteria and appear + after this Tag in the document.""" + return self._find_all(name, attrs, text, limit, self.next_elements, + **kwargs) + findAllNext = find_all_next # BS3 + + def find_next_sibling(self, name=None, attrs={}, text=None, **kwargs): + """Returns the closest sibling to this Tag that matches the + given criteria and appears after this Tag in the document.""" + return self._find_one(self.find_next_siblings, name, attrs, text, + **kwargs) + findNextSibling = find_next_sibling # BS3 + + def find_next_siblings(self, name=None, attrs={}, text=None, limit=None, + **kwargs): + """Returns the siblings of this Tag that match the given + criteria and appear after this Tag in the document.""" + return self._find_all(name, attrs, text, limit, + self.next_siblings, **kwargs) + findNextSiblings = find_next_siblings # BS3 + fetchNextSiblings = find_next_siblings # BS2 + + def find_previous(self, name=None, attrs={}, text=None, **kwargs): + """Returns the first item that matches the given criteria and + appears before this Tag in the document.""" + return self._find_one( + self.find_all_previous, name, attrs, text, **kwargs) + findPrevious = find_previous # BS3 + + def find_all_previous(self, name=None, attrs={}, text=None, limit=None, + **kwargs): + """Returns all items that match the given criteria and appear + before this Tag in the document.""" + return self._find_all(name, attrs, text, limit, self.previous_elements, + **kwargs) + findAllPrevious = find_all_previous # BS3 + fetchPrevious = find_all_previous # BS2 + + def find_previous_sibling(self, name=None, attrs={}, text=None, **kwargs): + """Returns the closest sibling to this Tag that matches the + given criteria and appears before this Tag in the document.""" + return self._find_one(self.find_previous_siblings, name, attrs, text, + **kwargs) + findPreviousSibling = find_previous_sibling # BS3 + + def find_previous_siblings(self, name=None, attrs={}, text=None, + limit=None, **kwargs): + """Returns the siblings of this Tag that match the given + criteria and appear before this Tag in the document.""" + return self._find_all(name, attrs, text, limit, + self.previous_siblings, **kwargs) + findPreviousSiblings = find_previous_siblings # BS3 + fetchPreviousSiblings = find_previous_siblings # BS2 + + def find_parent(self, name=None, attrs={}, **kwargs): + """Returns the closest parent of this Tag that matches the given + criteria.""" + # NOTE: We can't use _find_one because findParents takes a different + # set of arguments. + r = None + l = self.find_parents(name, attrs, 1) + if l: + r = l[0] + return r + findParent = find_parent # BS3 + + def find_parents(self, name=None, attrs={}, limit=None, **kwargs): + """Returns the parents of this Tag that match the given + criteria.""" + + return self._find_all(name, attrs, None, limit, self.parents, + **kwargs) + findParents = find_parents # BS3 + fetchParents = find_parents # BS2 + + @property + def next(self): + return self.next_element + + @property + def previous(self): + return self.previous_element + + #These methods do the real heavy lifting. + + def _find_one(self, method, name, attrs, text, **kwargs): + r = None + l = method(name, attrs, text, 1, **kwargs) + if l: + r = l[0] + return r + + def _find_all(self, name, attrs, text, limit, generator, **kwargs): + "Iterates over a generator looking for things that match." + + if isinstance(name, SoupStrainer): + strainer = name + elif text is None and not limit and not attrs and not kwargs: + # Optimization to find all tags. + if name is True or name is None: + return [element for element in generator + if isinstance(element, Tag)] + # Optimization to find all tags with a given name. + elif isinstance(name, basestring): + return [element for element in generator + if isinstance(element, Tag) and element.name == name] + else: + strainer = SoupStrainer(name, attrs, text, **kwargs) + else: + # Build a SoupStrainer + strainer = SoupStrainer(name, attrs, text, **kwargs) + results = ResultSet(strainer) + while True: + try: + i = next(generator) + except StopIteration: + break + if i: + found = strainer.search(i) + if found: + results.append(found) + if limit and len(results) >= limit: + break + return results + + #These generators can be used to navigate starting from both + #NavigableStrings and Tags. + @property + def next_elements(self): + i = self.next_element + while i is not None: + yield i + i = i.next_element + + @property + def next_siblings(self): + i = self.next_sibling + while i is not None: + yield i + i = i.next_sibling + + @property + def previous_elements(self): + i = self.previous_element + while i is not None: + yield i + i = i.previous_element + + @property + def previous_siblings(self): + i = self.previous_sibling + while i is not None: + yield i + i = i.previous_sibling + + @property + def parents(self): + i = self.parent + while i is not None: + yield i + i = i.parent + + # Methods for supporting CSS selectors. + + tag_name_re = re.compile('^[a-z0-9]+$') + + # /^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/ + # \---/ \---/\-------------/ \-------/ + # | | | | + # | | | The value + # | | ~,|,^,$,* or = + # | Attribute + # Tag + attribselect_re = re.compile( + r'^(?P\w+)?\[(?P\w+)(?P[=~\|\^\$\*]?)' + + r'=?"?(?P[^\]"]*)"?\]$' + ) + + def _attr_value_as_string(self, value, default=None): + """Force an attribute value into a string representation. + + A multi-valued attribute will be converted into a + space-separated stirng. + """ + value = self.get(value, default) + if isinstance(value, list) or isinstance(value, tuple): + value =" ".join(value) + return value + + def _attribute_checker(self, operator, attribute, value=''): + """Create a function that performs a CSS selector operation. + + Takes an operator, attribute and optional value. Returns a + function that will return True for elements that match that + combination. + """ + if operator == '=': + # string representation of `attribute` is equal to `value` + return lambda el: el._attr_value_as_string(attribute) == value + elif operator == '~': + # space-separated list representation of `attribute` + # contains `value` + def _includes_value(element): + attribute_value = element.get(attribute, []) + if not isinstance(attribute_value, list): + attribute_value = attribute_value.split() + return value in attribute_value + return _includes_value + elif operator == '^': + # string representation of `attribute` starts with `value` + return lambda el: el._attr_value_as_string( + attribute, '').startswith(value) + elif operator == '$': + # string represenation of `attribute` ends with `value` + return lambda el: el._attr_value_as_string( + attribute, '').endswith(value) + elif operator == '*': + # string representation of `attribute` contains `value` + return lambda el: value in el._attr_value_as_string(attribute, '') + elif operator == '|': + # string representation of `attribute` is either exactly + # `value` or starts with `value` and then a dash. + def _is_or_starts_with_dash(element): + attribute_value = element._attr_value_as_string(attribute, '') + return (attribute_value == value or attribute_value.startswith( + value + '-')) + return _is_or_starts_with_dash + else: + return lambda el: el.has_attr(attribute) + + def select(self, selector, recursive=True): + """Perform a CSS selection operation on the current element.""" + tokens = selector.split() + current_context = [self] + for index, token in enumerate(tokens): + if tokens[index - 1] == '>': + # already found direct descendants in last step. skip this + # step. + continue + m = self.attribselect_re.match(token) + if m is not None: + # Attribute selector + tag, attribute, operator, value = m.groups() + if not tag: + tag = True + checker = self._attribute_checker(operator, attribute, value) + found = [] + for context in current_context: + found.extend( + [el for el in context.find_all(tag, recursive=recursive) if checker(el)]) + current_context = found + continue + + if '#' in token: + # ID selector + tag, id = token.split('#', 1) + if tag == "": + tag = True + el = current_context[0].find(tag, {'id': id}) + if el is None: + return [] # No match + current_context = [el] + continue + + if '.' in token: + # Class selector + tag_name, klass = token.split('.', 1) + if not tag_name: + tag_name = True + classes = set(klass.split('.')) + found = [] + def classes_match(tag): + if tag_name is not True and tag.name != tag_name: + return False + if not tag.has_attr('class'): + return False + return classes.issubset(tag['class']) + for context in current_context: + found.extend(context.find_all(classes_match, recursive=recursive)) + current_context = found + continue + + if ':' in token: + # Pseudoselector + tag_name, pseudo = token.split(':', 1) + if not tag_name: + raise Exception("Pseudoselectors must be prefixed by a tag name.") + pseudo_attributes = re.match('([a-zA-Z\d-]+)\(([a-zA-Z\d]+)\)', pseudo) + found = [] + if pseudo_attributes is not None: + pseudo_type, pseudo_value = pseudo_attributes.groups() + if pseudo_type == 'nth-of-type': + try: + pseudo_value = int(pseudo_value) + except: + raise Exception('Only numeric values are supported for the nth-of-type pseudoselector for now.') + if pseudo_value < 1: + raise Exception('nth-of-type pseudoselector value must be at least 1.') + pseudo_value = pseudo_value - 1 + for context in current_context: + all_nodes = context.find_all(tag_name, recursive=recursive) + if pseudo_value < len(all_nodes): + found.extend([all_nodes[pseudo_value]]) + current_context = found + continue + else: + raise Exception('Only the nth-of-type pseudoselector is supported for now.') + + if token == '*': + # Star selector + found = [] + for context in current_context: + found.extend(context.find_all(True, recursive=recursive)) + current_context = found + continue + + if token == '>': + # Child selector + tag = tokens[index + 1] + if not tag: + tag = True + + found = [] + for context in current_context: + found.extend(context.select(tag, recursive=False)) + current_context = found + continue + + # Here we should just have a regular tag + if not self.tag_name_re.match(token): + return [] + found = [] + for context in current_context: + found.extend(context.find_all(token, recursive=recursive)) + current_context = found + return current_context + + # Old non-property versions of the generators, for backwards + # compatibility with BS3. + def nextGenerator(self): + return self.next_elements + + def nextSiblingGenerator(self): + return self.next_siblings + + def previousGenerator(self): + return self.previous_elements + + def previousSiblingGenerator(self): + return self.previous_siblings + + def parentGenerator(self): + return self.parents + + +class NavigableString(unicode, PageElement): + + PREFIX = '' + SUFFIX = '' + + def __new__(cls, value): + """Create a new NavigableString. + + When unpickling a NavigableString, this method is called with + the string in DEFAULT_OUTPUT_ENCODING. That encoding needs to be + passed in to the superclass's __new__ or the superclass won't know + how to handle non-ASCII characters. + """ + if isinstance(value, unicode): + return unicode.__new__(cls, value) + return unicode.__new__(cls, value, DEFAULT_OUTPUT_ENCODING) + + def __getnewargs__(self): + return (unicode(self),) + + def __getattr__(self, attr): + """text.string gives you text. This is for backwards + compatibility for Navigable*String, but for CData* it lets you + get the string without the CData wrapper.""" + if attr == 'string': + return self + else: + raise AttributeError( + "'%s' object has no attribute '%s'" % ( + self.__class__.__name__, attr)) + + def output_ready(self, formatter="minimal"): + output = self.format_string(self, formatter) + return self.PREFIX + output + self.SUFFIX + + +class PreformattedString(NavigableString): + """A NavigableString not subject to the normal formatting rules. + + The string will be passed into the formatter (to trigger side effects), + but the return value will be ignored. + """ + + def output_ready(self, formatter="minimal"): + """CData strings are passed into the formatter. + But the return value is ignored.""" + self.format_string(self, formatter) + return self.PREFIX + self + self.SUFFIX + +class CData(PreformattedString): + + PREFIX = u'' + +class ProcessingInstruction(PreformattedString): + + PREFIX = u'' + +class Comment(PreformattedString): + + PREFIX = u'' + + +class Declaration(PreformattedString): + PREFIX = u'' + + +class Doctype(PreformattedString): + + @classmethod + def for_name_and_ids(cls, name, pub_id, system_id): + value = name + if pub_id is not None: + value += ' PUBLIC "%s"' % pub_id + if system_id is not None: + value += ' "%s"' % system_id + elif system_id is not None: + value += ' SYSTEM "%s"' % system_id + + return Doctype(value) + + PREFIX = u'\n' + + +class Tag(PageElement): + + """Represents a found HTML tag with its attributes and contents.""" + + def __init__(self, parser=None, builder=None, name=None, namespace=None, + prefix=None, attrs=None, parent=None, previous=None): + "Basic constructor." + + if parser is None: + self.parser_class = None + else: + # We don't actually store the parser object: that lets extracted + # chunks be garbage-collected. + self.parser_class = parser.__class__ + if name is None: + raise ValueError("No value provided for new tag's name.") + self.name = name + self.namespace = namespace + self.prefix = prefix + if attrs is None: + attrs = {} + elif builder.cdata_list_attributes: + attrs = builder._replace_cdata_list_attribute_values( + self.name, attrs) + else: + attrs = dict(attrs) + self.attrs = attrs + self.contents = [] + self.setup(parent, previous) + self.hidden = False + + # Set up any substitutions, such as the charset in a META tag. + if builder is not None: + builder.set_up_substitutions(self) + self.can_be_empty_element = builder.can_be_empty_element(name) + else: + self.can_be_empty_element = False + + parserClass = _alias("parser_class") # BS3 + + @property + def is_empty_element(self): + """Is this tag an empty-element tag? (aka a self-closing tag) + + A tag that has contents is never an empty-element tag. + + A tag that has no contents may or may not be an empty-element + tag. It depends on the builder used to create the tag. If the + builder has a designated list of empty-element tags, then only + a tag whose name shows up in that list is considered an + empty-element tag. + + If the builder has no designated list of empty-element tags, + then any tag with no contents is an empty-element tag. + """ + return len(self.contents) == 0 and self.can_be_empty_element + isSelfClosing = is_empty_element # BS3 + + @property + def string(self): + """Convenience property to get the single string within this tag. + + :Return: If this tag has a single string child, return value + is that string. If this tag has no children, or more than one + child, return value is None. If this tag has one child tag, + return value is the 'string' attribute of the child tag, + recursively. + """ + if len(self.contents) != 1: + return None + child = self.contents[0] + if isinstance(child, NavigableString): + return child + return child.string + + @string.setter + def string(self, string): + self.clear() + self.append(string.__class__(string)) + + def _all_strings(self, strip=False): + """Yield all child strings, possibly stripping them.""" + for descendant in self.descendants: + if not isinstance(descendant, NavigableString): + continue + if strip: + descendant = descendant.strip() + if len(descendant) == 0: + continue + yield descendant + strings = property(_all_strings) + + @property + def stripped_strings(self): + for string in self._all_strings(True): + yield string + + def get_text(self, separator=u"", strip=False): + """ + Get all child strings, concatenated using the given separator. + """ + return separator.join([s for s in self._all_strings(strip)]) + getText = get_text + text = property(get_text) + + def decompose(self): + """Recursively destroys the contents of this tree.""" + self.extract() + i = self + while i is not None: + next = i.next_element + i.__dict__.clear() + i = next + + def clear(self, decompose=False): + """ + Extract all children. If decompose is True, decompose instead. + """ + if decompose: + for element in self.contents[:]: + if isinstance(element, Tag): + element.decompose() + else: + element.extract() + else: + for element in self.contents[:]: + element.extract() + + def index(self, element): + """ + Find the index of a child by identity, not value. Avoids issues with + tag.contents.index(element) getting the index of equal elements. + """ + for i, child in enumerate(self.contents): + if child is element: + return i + raise ValueError("Tag.index: element not in tag") + + def get(self, key, default=None): + """Returns the value of the 'key' attribute for the tag, or + the value given for 'default' if it doesn't have that + attribute.""" + return self.attrs.get(key, default) + + def has_attr(self, key): + return key in self.attrs + + def __hash__(self): + return str(self).__hash__() + + def __getitem__(self, key): + """tag[key] returns the value of the 'key' attribute for the tag, + and throws an exception if it's not there.""" + return self.attrs[key] + + def __iter__(self): + "Iterating over a tag iterates over its contents." + return iter(self.contents) + + def __len__(self): + "The length of a tag is the length of its list of contents." + return len(self.contents) + + def __contains__(self, x): + return x in self.contents + + def __nonzero__(self): + "A tag is non-None even if it has no contents." + return True + + def __setitem__(self, key, value): + """Setting tag[key] sets the value of the 'key' attribute for the + tag.""" + self.attrs[key] = value + + def __delitem__(self, key): + "Deleting tag[key] deletes all 'key' attributes for the tag." + self.attrs.pop(key, None) + + def __call__(self, *args, **kwargs): + """Calling a tag like a function is the same as calling its + find_all() method. Eg. tag('a') returns a list of all the A tags + found within this tag.""" + return self.find_all(*args, **kwargs) + + def __getattr__(self, tag): + #print "Getattr %s.%s" % (self.__class__, tag) + if len(tag) > 3 and tag.endswith('Tag'): + # BS3: soup.aTag -> "soup.find("a") + tag_name = tag[:-3] + warnings.warn( + '.%sTag is deprecated, use .find("%s") instead.' % ( + tag_name, tag_name)) + return self.find(tag_name) + # We special case contents to avoid recursion. + elif not tag.startswith("__") and not tag=="contents": + return self.find(tag) + raise AttributeError( + "'%s' object has no attribute '%s'" % (self.__class__, tag)) + + def __eq__(self, other): + """Returns true iff this tag has the same name, the same attributes, + and the same contents (recursively) as the given tag.""" + if self is other: + return True + if (not hasattr(other, 'name') or + not hasattr(other, 'attrs') or + not hasattr(other, 'contents') or + self.name != other.name or + self.attrs != other.attrs or + len(self) != len(other)): + return False + for i, my_child in enumerate(self.contents): + if my_child != other.contents[i]: + return False + return True + + def __ne__(self, other): + """Returns true iff this tag is not identical to the other tag, + as defined in __eq__.""" + return not self == other + + def __repr__(self, encoding=DEFAULT_OUTPUT_ENCODING): + """Renders this tag as a string.""" + return self.encode(encoding) + + def __unicode__(self): + return self.decode() + + def __str__(self): + return self.encode() + + if PY3K: + __str__ = __repr__ = __unicode__ + + def encode(self, encoding=DEFAULT_OUTPUT_ENCODING, + indent_level=None, formatter="minimal", + errors="xmlcharrefreplace"): + # Turn the data structure into Unicode, then encode the + # Unicode. + u = self.decode(indent_level, encoding, formatter) + return u.encode(encoding, errors) + + def decode(self, indent_level=None, + eventual_encoding=DEFAULT_OUTPUT_ENCODING, + formatter="minimal"): + """Returns a Unicode representation of this tag and its contents. + + :param eventual_encoding: The tag is destined to be + encoded into this encoding. This method is _not_ + responsible for performing that encoding. This information + is passed in so that it can be substituted in if the + document contains a tag that mentions the document's + encoding. + """ + attrs = [] + if self.attrs: + for key, val in sorted(self.attrs.items()): + if val is None: + decoded = key + else: + if isinstance(val, list) or isinstance(val, tuple): + val = ' '.join(val) + elif not isinstance(val, basestring): + val = unicode(val) + elif ( + isinstance(val, AttributeValueWithCharsetSubstitution) + and eventual_encoding is not None): + val = val.encode(eventual_encoding) + + text = self.format_string(val, formatter) + decoded = ( + unicode(key) + '=' + + EntitySubstitution.quoted_attribute_value(text)) + attrs.append(decoded) + close = '' + closeTag = '' + + prefix = '' + if self.prefix: + prefix = self.prefix + ":" + + if self.is_empty_element: + close = '/' + else: + closeTag = '' % (prefix, self.name) + + pretty_print = (indent_level is not None) + if pretty_print: + space = (' ' * (indent_level - 1)) + indent_contents = indent_level + 1 + else: + space = '' + indent_contents = None + contents = self.decode_contents( + indent_contents, eventual_encoding, formatter) + + if self.hidden: + # This is the 'document root' object. + s = contents + else: + s = [] + attribute_string = '' + if attrs: + attribute_string = ' ' + ' '.join(attrs) + if pretty_print: + s.append(space) + s.append('<%s%s%s%s>' % ( + prefix, self.name, attribute_string, close)) + if pretty_print: + s.append("\n") + s.append(contents) + if pretty_print and contents and contents[-1] != "\n": + s.append("\n") + if pretty_print and closeTag: + s.append(space) + s.append(closeTag) + if pretty_print and closeTag and self.next_sibling: + s.append("\n") + s = ''.join(s) + return s + + def prettify(self, encoding=None, formatter="minimal"): + if encoding is None: + return self.decode(True, formatter=formatter) + else: + return self.encode(encoding, True, formatter=formatter) + + def decode_contents(self, indent_level=None, + eventual_encoding=DEFAULT_OUTPUT_ENCODING, + formatter="minimal"): + """Renders the contents of this tag as a Unicode string. + + :param eventual_encoding: The tag is destined to be + encoded into this encoding. This method is _not_ + responsible for performing that encoding. This information + is passed in so that it can be substituted in if the + document contains a tag that mentions the document's + encoding. + """ + pretty_print = (indent_level is not None) + s = [] + for c in self: + text = None + if isinstance(c, NavigableString): + text = c.output_ready(formatter) + elif isinstance(c, Tag): + s.append(c.decode(indent_level, eventual_encoding, + formatter)) + if text and indent_level: + text = text.strip() + if text: + if pretty_print: + s.append(" " * (indent_level - 1)) + s.append(text) + if pretty_print: + s.append("\n") + return ''.join(s) + + def encode_contents( + self, indent_level=None, encoding=DEFAULT_OUTPUT_ENCODING, + formatter="minimal"): + """Renders the contents of this tag as a bytestring.""" + contents = self.decode_contents(indent_level, encoding, formatter) + return contents.encode(encoding) + + # Old method for BS3 compatibility + def renderContents(self, encoding=DEFAULT_OUTPUT_ENCODING, + prettyPrint=False, indentLevel=0): + if not prettyPrint: + indentLevel = None + return self.encode_contents( + indent_level=indentLevel, encoding=encoding) + + #Soup methods + + def find(self, name=None, attrs={}, recursive=True, text=None, + **kwargs): + """Return only the first child of this Tag matching the given + criteria.""" + r = None + l = self.find_all(name, attrs, recursive, text, 1, **kwargs) + if l: + r = l[0] + return r + findChild = find + + def find_all(self, name=None, attrs={}, recursive=True, text=None, + limit=None, **kwargs): + """Extracts a list of Tag objects that match the given + criteria. You can specify the name of the Tag and any + attributes you want the Tag to have. + + The value of a key-value pair in the 'attrs' map can be a + string, a list of strings, a regular expression object, or a + callable that takes a string and returns whether or not the + string matches for some custom definition of 'matches'. The + same is true of the tag name.""" + + generator = self.descendants + if not recursive: + generator = self.children + return self._find_all(name, attrs, text, limit, generator, **kwargs) + findAll = find_all # BS3 + findChildren = find_all # BS2 + + #Generator methods + @property + def children(self): + # return iter() to make the purpose of the method clear + return iter(self.contents) # XXX This seems to be untested. + + @property + def descendants(self): + if not len(self.contents): + return + stopNode = self._last_descendant().next_element + current = self.contents[0] + while current is not stopNode: + yield current + current = current.next_element + + # Old names for backwards compatibility + def childGenerator(self): + return self.children + + def recursiveChildGenerator(self): + return self.descendants + + # This was kind of misleading because has_key() (attributes) was + # different from __in__ (contents). has_key() is gone in Python 3, + # anyway. + has_key = has_attr + +# Next, a couple classes to represent queries and their results. +class SoupStrainer(object): + """Encapsulates a number of ways of matching a markup element (tag or + text).""" + + def __init__(self, name=None, attrs={}, text=None, **kwargs): + self.name = self._normalize_search_value(name) + if not isinstance(attrs, dict): + # Treat a non-dict value for attrs as a search for the 'class' + # attribute. + kwargs['class'] = attrs + attrs = None + + if 'class_' in kwargs: + # Treat class_="foo" as a search for the 'class' + # attribute, overriding any non-dict value for attrs. + kwargs['class'] = kwargs['class_'] + del kwargs['class_'] + + if kwargs: + if attrs: + attrs = attrs.copy() + attrs.update(kwargs) + else: + attrs = kwargs + normalized_attrs = {} + for key, value in attrs.items(): + normalized_attrs[key] = self._normalize_search_value(value) + + self.attrs = normalized_attrs + self.text = self._normalize_search_value(text) + + def _normalize_search_value(self, value): + # Leave it alone if it's a Unicode string, a callable, a + # regular expression, a boolean, or None. + if (isinstance(value, unicode) or callable(value) or hasattr(value, 'match') + or isinstance(value, bool) or value is None): + return value + + # If it's a bytestring, convert it to Unicode, treating it as UTF-8. + if isinstance(value, bytes): + return value.decode("utf8") + + # If it's listlike, convert it into a list of strings. + if hasattr(value, '__iter__'): + new_value = [] + for v in value: + if (hasattr(v, '__iter__') and not isinstance(v, bytes) + and not isinstance(v, unicode)): + # This is almost certainly the user's mistake. In the + # interests of avoiding infinite loops, we'll let + # it through as-is rather than doing a recursive call. + new_value.append(v) + else: + new_value.append(self._normalize_search_value(v)) + return new_value + + # Otherwise, convert it into a Unicode string. + # The unicode(str()) thing is so this will do the same thing on Python 2 + # and Python 3. + return unicode(str(value)) + + def __str__(self): + if self.text: + return self.text + else: + return "%s|%s" % (self.name, self.attrs) + + def search_tag(self, markup_name=None, markup_attrs={}): + found = None + markup = None + if isinstance(markup_name, Tag): + markup = markup_name + markup_attrs = markup + call_function_with_tag_data = ( + isinstance(self.name, collections.Callable) + and not isinstance(markup_name, Tag)) + + if ((not self.name) + or call_function_with_tag_data + or (markup and self._matches(markup, self.name)) + or (not markup and self._matches(markup_name, self.name))): + if call_function_with_tag_data: + match = self.name(markup_name, markup_attrs) + else: + match = True + markup_attr_map = None + for attr, match_against in list(self.attrs.items()): + if not markup_attr_map: + if hasattr(markup_attrs, 'get'): + markup_attr_map = markup_attrs + else: + markup_attr_map = {} + for k, v in markup_attrs: + markup_attr_map[k] = v + attr_value = markup_attr_map.get(attr) + if not self._matches(attr_value, match_against): + match = False + break + if match: + if markup: + found = markup + else: + found = markup_name + if found and self.text and not self._matches(found.string, self.text): + found = None + return found + searchTag = search_tag + + def search(self, markup): + # print 'looking for %s in %s' % (self, markup) + found = None + # If given a list of items, scan it for a text element that + # matches. + if hasattr(markup, '__iter__') and not isinstance(markup, (Tag, basestring)): + for element in markup: + if isinstance(element, NavigableString) \ + and self.search(element): + found = element + break + # If it's a Tag, make sure its name or attributes match. + # Don't bother with Tags if we're searching for text. + elif isinstance(markup, Tag): + if not self.text or self.name or self.attrs: + found = self.search_tag(markup) + # If it's text, make sure the text matches. + elif isinstance(markup, NavigableString) or \ + isinstance(markup, basestring): + if not self.name and not self.attrs and self._matches(markup, self.text): + found = markup + else: + raise Exception( + "I don't know how to match against a %s" % markup.__class__) + return found + + def _matches(self, markup, match_against): + # print u"Matching %s against %s" % (markup, match_against) + result = False + if isinstance(markup, list) or isinstance(markup, tuple): + # This should only happen when searching a multi-valued attribute + # like 'class'. + if (isinstance(match_against, unicode) + and ' ' in match_against): + # A bit of a special case. If they try to match "foo + # bar" on a multivalue attribute's value, only accept + # the literal value "foo bar" + # + # XXX This is going to be pretty slow because we keep + # splitting match_against. But it shouldn't come up + # too often. + return (whitespace_re.split(match_against) == markup) + else: + for item in markup: + if self._matches(item, match_against): + return True + return False + + if match_against is True: + # True matches any non-None value. + return markup is not None + + if isinstance(match_against, collections.Callable): + return match_against(markup) + + # Custom callables take the tag as an argument, but all + # other ways of matching match the tag name as a string. + if isinstance(markup, Tag): + markup = markup.name + + # Ensure that `markup` is either a Unicode string, or None. + markup = self._normalize_search_value(markup) + + if markup is None: + # None matches None, False, an empty string, an empty list, and so on. + return not match_against + + if isinstance(match_against, unicode): + # Exact string match + return markup == match_against + + if hasattr(match_against, 'match'): + # Regexp match + return match_against.search(markup) + + if hasattr(match_against, '__iter__'): + # The markup must be an exact match against something + # in the iterable. + return markup in match_against + + +class ResultSet(list): + """A ResultSet is just a list that keeps track of the SoupStrainer + that created it.""" + def __init__(self, source): + list.__init__([]) + self.source = source diff --git a/updater/bs4/testing.py b/updater/bs4/testing.py new file mode 100644 index 0000000..1a92af4 --- /dev/null +++ b/updater/bs4/testing.py @@ -0,0 +1,554 @@ +"""Helper classes for tests.""" + +import copy +import functools +import unittest +from unittest import TestCase +from bs4 import BeautifulSoup +from bs4.element import ( + CharsetMetaAttributeValue, + Comment, + ContentMetaAttributeValue, + Doctype, + SoupStrainer, +) + +from bs4.builder import HTMLParserTreeBuilder +default_builder = HTMLParserTreeBuilder + + +class SoupTest(unittest.TestCase): + + @property + def default_builder(self): + return default_builder() + + def soup(self, markup, **kwargs): + """Build a Beautiful Soup object from markup.""" + builder = kwargs.pop('builder', self.default_builder) + return BeautifulSoup(markup, builder=builder, **kwargs) + + def document_for(self, markup): + """Turn an HTML fragment into a document. + + The details depend on the builder. + """ + return self.default_builder.test_fragment_to_document(markup) + + def assertSoupEquals(self, to_parse, compare_parsed_to=None): + builder = self.default_builder + obj = BeautifulSoup(to_parse, builder=builder) + if compare_parsed_to is None: + compare_parsed_to = to_parse + + self.assertEqual(obj.decode(), self.document_for(compare_parsed_to)) + + +class HTMLTreeBuilderSmokeTest(object): + + """A basic test of a treebuilder's competence. + + Any HTML treebuilder, present or future, should be able to pass + these tests. With invalid markup, there's room for interpretation, + and different parsers can handle it differently. But with the + markup in these tests, there's not much room for interpretation. + """ + + def assertDoctypeHandled(self, doctype_fragment): + """Assert that a given doctype string is handled correctly.""" + doctype_str, soup = self._document_with_doctype(doctype_fragment) + + # Make sure a Doctype object was created. + doctype = soup.contents[0] + self.assertEqual(doctype.__class__, Doctype) + self.assertEqual(doctype, doctype_fragment) + self.assertEqual(str(soup)[:len(doctype_str)], doctype_str) + + # Make sure that the doctype was correctly associated with the + # parse tree and that the rest of the document parsed. + self.assertEqual(soup.p.contents[0], 'foo') + + def _document_with_doctype(self, doctype_fragment): + """Generate and parse a document with the given doctype.""" + doctype = '' % doctype_fragment + markup = doctype + '\n

foo

' + soup = self.soup(markup) + return doctype, soup + + def test_normal_doctypes(self): + """Make sure normal, everyday HTML doctypes are handled correctly.""" + self.assertDoctypeHandled("html") + self.assertDoctypeHandled( + 'html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"') + + def test_public_doctype_with_url(self): + doctype = 'html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"' + self.assertDoctypeHandled(doctype) + + def test_system_doctype(self): + self.assertDoctypeHandled('foo SYSTEM "http://www.example.com/"') + + def test_namespaced_system_doctype(self): + # We can handle a namespaced doctype with a system ID. + self.assertDoctypeHandled('xsl:stylesheet SYSTEM "htmlent.dtd"') + + def test_namespaced_public_doctype(self): + # Test a namespaced doctype with a public id. + self.assertDoctypeHandled('xsl:stylesheet PUBLIC "htmlent.dtd"') + + def test_real_xhtml_document(self): + """A real XHTML document should come out more or less the same as it went in.""" + markup = b""" + + +Hello. +Goodbye. +""" + soup = self.soup(markup) + self.assertEqual( + soup.encode("utf-8").replace(b"\n", b""), + markup.replace(b"\n", b"")) + + def test_deepcopy(self): + """Make sure you can copy the tree builder. + + This is important because the builder is part of a + BeautifulSoup object, and we want to be able to copy that. + """ + copy.deepcopy(self.default_builder) + + def test_p_tag_is_never_empty_element(self): + """A

tag is never designated as an empty-element tag. + + Even if the markup shows it as an empty-element tag, it + shouldn't be presented that way. + """ + soup = self.soup("

") + self.assertFalse(soup.p.is_empty_element) + self.assertEqual(str(soup.p), "

") + + def test_unclosed_tags_get_closed(self): + """A tag that's not closed by the end of the document should be closed. + + This applies to all tags except empty-element tags. + """ + self.assertSoupEquals("

", "

") + self.assertSoupEquals("", "") + + self.assertSoupEquals("
", "
") + + def test_br_is_always_empty_element_tag(self): + """A
tag is designated as an empty-element tag. + + Some parsers treat

as one
tag, some parsers as + two tags, but it should always be an empty-element tag. + """ + soup = self.soup("

") + self.assertTrue(soup.br.is_empty_element) + self.assertEqual(str(soup.br), "
") + + def test_nested_formatting_elements(self): + self.assertSoupEquals("") + + def test_comment(self): + # Comments are represented as Comment objects. + markup = "

foobaz

" + self.assertSoupEquals(markup) + + soup = self.soup(markup) + comment = soup.find(text="foobar") + self.assertEqual(comment.__class__, Comment) + + # The comment is properly integrated into the tree. + foo = soup.find(text="foo") + self.assertEqual(comment, foo.next_element) + baz = soup.find(text="baz") + self.assertEquals(comment, baz.previous_element) + + def test_preserved_whitespace_in_pre_and_textarea(self): + """Whitespace must be preserved in 
 and ")
+
+    def test_nested_inline_elements(self):
+        """Inline elements can be nested indefinitely."""
+        b_tag = "Inside a B tag"
+        self.assertSoupEquals(b_tag)
+
+        nested_b_tag = "
A nested tag
"
+        self.assertSoupEquals(nested_b_tag)
+
+        double_nested_b_tag = "
A doubly nested tag
"
+        self.assertSoupEquals(nested_b_tag)
+
+    def test_nested_block_level_elements(self):
+        """Block elements can be nested."""
+        soup = self.soup('
Foo
')
+        blockquote = soup.blockquote
+        self.assertEqual(blockquote.p.b.string, 'Foo')
+        self.assertEqual(blockquote.b.string, 'Foo')
+
+    def test_correctly_nested_tables(self):
+        """One table can go inside another one."""
+        markup = (''
+                  ''
+                  "')
+
+        self.assertSoupEquals(
+            markup,
+            '
Here's another table:"
+                  ''
+                  ''
+                  '
foo
Here\'s another table:'
+            '
foo
'
+            '
')
+
+        self.assertSoupEquals(
+            ""
+            ""
+            "
Foo
Bar
Baz
")
+
+    def test_deeply_nested_multivalued_attribute(self):
+        # html5lib can set the attributes of the same tag many times
+        # as it rearranges the tree. This has caused problems with
+        # multivalued attributes.
+        markup = '
'
+        soup = self.soup(markup)
+        self.assertEqual(["css"], soup.div.div['class'])
+
+    def test_angle_brackets_in_attribute_values_are_escaped(self):
+        self.assertSoupEquals('', '')
+
+    def test_entities_in_attributes_converted_to_unicode(self):
+        expect = u'
'
+        self.assertSoupEquals('
', expect)
+        self.assertSoupEquals('
', expect)
+        self.assertSoupEquals('
', expect)
+
+    def test_entities_in_text_converted_to_unicode(self):
+        expect = u'
pi\N{LATIN SMALL LETTER N WITH TILDE}ata
'
+        self.assertSoupEquals("
piñata
", expect)
+        self.assertSoupEquals("
piñata
", expect)
+        self.assertSoupEquals("
piñata
", expect)
+
+    def test_quot_entity_converted_to_quotation_mark(self):
+        self.assertSoupEquals("
I said "good day!"
",
+                              '
I said "good day!"
')
+
+    def test_out_of_range_entity(self):
+        expect = u"\N{REPLACEMENT CHARACTER}"
+        self.assertSoupEquals("�", expect)
+        self.assertSoupEquals("�", expect)
+        self.assertSoupEquals("�", expect)
+
+    def test_basic_namespaces(self):
+        """Parsers don't need to *understand* namespaces, but at the
+        very least they should not choke on namespaces or lose
+        data."""
+
+        markup = b'4'
+        soup = self.soup(markup)
+        self.assertEqual(markup, soup.encode())
+        html = soup.html
+        self.assertEqual('http://www.w3.org/1999/xhtml', soup.html['xmlns'])
+        self.assertEqual(
+            'http://www.w3.org/1998/Math/MathML', soup.html['xmlns:mathml'])
+        self.assertEqual(
+            'http://www.w3.org/2000/svg', soup.html['xmlns:svg'])
+
+    def test_multivalued_attribute_value_becomes_list(self):
+        markup = b''
+        soup = self.soup(markup)
+        self.assertEqual(['foo', 'bar'], soup.a['class'])
+
+    #
+    # Generally speaking, tests below this point are more tests of
+    # Beautiful Soup than tests of the tree builders. But parsers are
+    # weird, so we run these tests separately for every tree builder
+    # to detect any differences between them.
+    #
+
+    def test_soupstrainer(self):
+        """Parsers should be able to work with SoupStrainers."""
+        strainer = SoupStrainer("b")
+        soup = self.soup("A bold  statement",
+                         parse_only=strainer)
+        self.assertEqual(soup.decode(), "bold")
+
+    def test_single_quote_attribute_values_become_double_quotes(self):
+        self.assertSoupEquals("",
+                              '')
+
+    def test_attribute_values_with_nested_quotes_are_left_alone(self):
+        text = """a"""
+        self.assertSoupEquals(text)
+
+    def test_attribute_values_with_double_nested_quotes_get_quoted(self):
+        text = """a"""
+        soup = self.soup(text)
+        soup.foo['attr'] = 'Brawls happen at "Bob\'s Bar"'
+        self.assertSoupEquals(
+            soup.foo.decode(),
+            """a""")
+
+    def test_ampersand_in_attribute_value_gets_escaped(self):
+        self.assertSoupEquals('',
+                              '')
+
+        self.assertSoupEquals(
+            'foo',
+            'foo')
+
+    def test_escaped_ampersand_in_attribute_value_is_left_alone(self):
+        self.assertSoupEquals('')
+
+    def test_entities_in_strings_converted_during_parsing(self):
+        # Both XML and HTML entities are converted to Unicode characters
+        # during parsing.
+        text = "
<<sacré bleu!>>
"
+        expected = u"
<<sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>
"
+        self.assertSoupEquals(text, expected)
+
+    def test_smart_quotes_converted_on_the_way_in(self):
+        # Microsoft smart quotes are converted to Unicode characters during
+        # parsing.
+        quote = b"
\x91Foo\x92
"
+        soup = self.soup(quote)
+        self.assertEqual(
+            soup.p.string,
+            u"\N{LEFT SINGLE QUOTATION MARK}Foo\N{RIGHT SINGLE QUOTATION MARK}")
+
+    def test_non_breaking_spaces_converted_on_the_way_in(self):
+        soup = self.soup("  ")
+        self.assertEqual(soup.a.string, u"\N{NO-BREAK SPACE}" * 2)
+
+    def test_entities_converted_on_the_way_out(self):
+        text = "
<<sacré bleu!>>
"
+        expected = u"
<<sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>
".encode("utf-8")
+        soup = self.soup(text)
+        self.assertEqual(soup.p.encode("utf-8"), expected)
+
+    def test_real_iso_latin_document(self):
+        # Smoke test of interrelated functionality, using an
+        # easy-to-understand document.
+
+        # Here it is in Unicode. Note that it claims to be in ISO-Latin-1.
+        unicode_html = u'
Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!
'
+
+        # That's because we're going to encode it into ISO-Latin-1, and use
+        # that to test.
+        iso_latin_html = unicode_html.encode("iso-8859-1")
+
+        # Parse the ISO-Latin-1 HTML.
+        soup = self.soup(iso_latin_html)
+        # Encode it to UTF-8.
+        result = soup.encode("utf-8")
+
+        # What do we expect the result to look like? Well, it would
+        # look like unicode_html, except that the META tag would say
+        # UTF-8 instead of ISO-Latin-1.
+        expected = unicode_html.replace("ISO-Latin-1", "utf-8")
+
+        # And, of course, it would be in UTF-8, not Unicode.
+        expected = expected.encode("utf-8")
+
+        # Ta-da!
+        self.assertEqual(result, expected)
+
+    def test_real_shift_jis_document(self):
+        # Smoke test to make sure the parser can handle a document in
+        # Shift-JIS encoding, without choking.
+        shift_jis_html = (
+            b'
'
+            b'\x82\xb1\x82\xea\x82\xcdShift-JIS\x82\xc5\x83R\x81[\x83f'
+            b'\x83B\x83\x93\x83O\x82\xb3\x82\xea\x82\xbd\x93\xfa\x96{\x8c'
+            b'\xea\x82\xcc\x83t\x83@\x83C\x83\x8b\x82\xc5\x82\xb7\x81B'
+            b'
')
+        unicode_html = shift_jis_html.decode("shift-jis")
+        soup = self.soup(unicode_html)
+
+        # Make sure the parse tree is correctly encoded to various
+        # encodings.
+        self.assertEqual(soup.encode("utf-8"), unicode_html.encode("utf-8"))
+        self.assertEqual(soup.encode("euc_jp"), unicode_html.encode("euc_jp"))
+
+    def test_real_hebrew_document(self):
+        # A real-world test to make sure we can convert ISO-8859-9 (a
+        # Hebrew encoding) to UTF-8.
+        hebrew_document = b'Hebrew (ISO 8859-8) in Visual Directionality
Hebrew (ISO 8859-8) in Visual Directionality
\xed\xe5\xec\xf9'
+        soup = self.soup(
+            hebrew_document, from_encoding="iso8859-8")
+        self.assertEqual(soup.original_encoding, 'iso8859-8')
+        self.assertEqual(
+            soup.encode('utf-8'),
+            hebrew_document.decode("iso8859-8").encode("utf-8"))
+
+    def test_meta_tag_reflects_current_encoding(self):
+        # Here's the  tag saying that a document is
+        # encoded in Shift-JIS.
+        meta_tag = ('')
+
+        # Here's a document incorporating that meta tag.
+        shift_jis_html = (
+            '\n%s\n'
+            ''
+            'Shift-JIS markup goes here.') % meta_tag
+        soup = self.soup(shift_jis_html)
+
+        # Parse the document, and the charset is seemingly unaffected.
+        parsed_meta = soup.find('meta', {'http-equiv': 'Content-type'})
+        content = parsed_meta['content']
+        self.assertEqual('text/html; charset=x-sjis', content)
+
+        # But that value is actually a ContentMetaAttributeValue object.
+        self.assertTrue(isinstance(content, ContentMetaAttributeValue))
+
+        # And it will take on a value that reflects its current
+        # encoding.
+        self.assertEqual('text/html; charset=utf8', content.encode("utf8"))
+
+        # For the rest of the story, see TestSubstitutions in
+        # test_tree.py.
+
+    def test_html5_style_meta_tag_reflects_current_encoding(self):
+        # Here's the  tag saying that a document is
+        # encoded in Shift-JIS.
+        meta_tag = ('')
+
+        # Here's a document incorporating that meta tag.
+        shift_jis_html = (
+            '\n%s\n'
+            ''
+            'Shift-JIS markup goes here.') % meta_tag
+        soup = self.soup(shift_jis_html)
+
+        # Parse the document, and the charset is seemingly unaffected.
+        parsed_meta = soup.find('meta', id="encoding")
+        charset = parsed_meta['charset']
+        self.assertEqual('x-sjis', charset)
+
+        # But that value is actually a CharsetMetaAttributeValue object.
+        self.assertTrue(isinstance(charset, CharsetMetaAttributeValue))
+
+        # And it will take on a value that reflects its current
+        # encoding.
+        self.assertEqual('utf8', charset.encode("utf8"))
+
+    def test_tag_with_no_attributes_can_have_attributes_added(self):
+        data = self.soup("text")
+        data.a['foo'] = 'bar'
+        self.assertEqual('text', data.a.decode())
+
+class XMLTreeBuilderSmokeTest(object):
+
+    def test_docstring_generated(self):
+        soup = self.soup("")
+        self.assertEqual(
+            soup.encode(), b'\n')
+
+    def test_real_xhtml_document(self):
+        """A real XHTML document should come out *exactly* the same as it went in."""
+        markup = b"""
+
+
+Hello.
+Goodbye.
+"""
+        soup = self.soup(markup)
+        self.assertEqual(
+            soup.encode("utf-8"), markup)
+
+    def test_popping_namespaced_tag(self):
+        markup = 'b2012-07-02T20:33:42Zcd'
+        soup = self.soup(markup)
+        self.assertEqual(
+            unicode(soup.rss), markup)
+
+    def test_docstring_includes_correct_encoding(self):
+        soup = self.soup("")
+        self.assertEqual(
+            soup.encode("latin1"),
+            b'\n')
+
+    def test_large_xml_document(self):
+        """A large XML document should come out the same as it went in."""
+        markup = (b'\n'
+                  + b'0' * (2**12)
+                  + b'')
+        soup = self.soup(markup)
+        self.assertEqual(soup.encode("utf-8"), markup)
+
+
+    def test_tags_are_empty_element_if_and_only_if_they_are_empty(self):
+        self.assertSoupEquals("
", "
")
+        self.assertSoupEquals("
foo
")
+
+    def test_namespaces_are_preserved(self):
+        markup = 'This tag is in the a namespaceThis tag is in the b namespace'
+        soup = self.soup(markup)
+        root = soup.root
+        self.assertEqual("http://example.com/", root['xmlns:a'])
+        self.assertEqual("http://example.net/", root['xmlns:b'])
+
+    def test_closing_namespaced_tag(self):
+        markup = '
20010504
'
+        soup = self.soup(markup)
+        self.assertEqual(unicode(soup.p), markup)
+
+    def test_namespaced_attributes(self):
+        markup = ''
+        soup = self.soup(markup)
+        self.assertEqual(unicode(soup.foo), markup)
+
+    def test_namespaced_attributes_xml_namespace(self):
+        markup = 'bar'
+        soup = self.soup(markup)
+        self.assertEqual(unicode(soup.foo), markup)
+
+class HTML5TreeBuilderSmokeTest(HTMLTreeBuilderSmokeTest):
+    """Smoke test for a tree builder that supports HTML5."""
+
+    def test_real_xhtml_document(self):
+        # Since XHTML is not HTML5, HTML5 parsers are not tested to handle
+        # XHTML documents in any particular way.
+        pass
+
+    def test_html_tags_have_namespace(self):
+        markup = ""
+        soup = self.soup(markup)
+        self.assertEqual("http://www.w3.org/1999/xhtml", soup.a.namespace)
+
+    def test_svg_tags_have_namespace(self):
+        markup = ''
+        soup = self.soup(markup)
+        namespace = "http://www.w3.org/2000/svg"
+        self.assertEqual(namespace, soup.svg.namespace)
+        self.assertEqual(namespace, soup.circle.namespace)
+
+
+    def test_mathml_tags_have_namespace(self):
+        markup = '5'
+        soup = self.soup(markup)
+        namespace = 'http://www.w3.org/1998/Math/MathML'
+        self.assertEqual(namespace, soup.math.namespace)
+        self.assertEqual(namespace, soup.msqrt.namespace)
+
+    def test_xml_declaration_becomes_comment(self):
+        markup = ''
+        soup = self.soup(markup)
+        self.assertTrue(isinstance(soup.contents[0], Comment))
+        self.assertEqual(soup.contents[0], '?xml version="1.0" encoding="utf-8"?')
+        self.assertEqual("html", soup.contents[0].next_element.name)
+
+def skipIf(condition, reason):
+   def nothing(test, *args, **kwargs):
+       return None
+
+   def decorator(test_item):
+       if condition:
+           return nothing
+       else:
+           return test_item
+
+   return decorator
diff --git a/updater/bs4/tests/__init__.py b/updater/bs4/tests/__init__.py
new file mode 100644
index 0000000..142c8cc
--- /dev/null
+++ b/updater/bs4/tests/__init__.py
@@ -0,0 +1 @@
+"The beautifulsoup tests."
diff --git a/updater/bs4/tests/test_builder_registry.py b/updater/bs4/tests/test_builder_registry.py
new file mode 100644
index 0000000..92ad10f
--- /dev/null
+++ b/updater/bs4/tests/test_builder_registry.py
@@ -0,0 +1,141 @@
+"""Tests of the builder registry."""
+
+import unittest
+
+from bs4 import BeautifulSoup
+from bs4.builder import (
+    builder_registry as registry,
+    HTMLParserTreeBuilder,
+    TreeBuilderRegistry,
+)
+
+try:
+    from bs4.builder import HTML5TreeBuilder
+    HTML5LIB_PRESENT = True
+except ImportError:
+    HTML5LIB_PRESENT = False
+
+try:
+    from bs4.builder import (
+        LXMLTreeBuilderForXML,
+        LXMLTreeBuilder,
+        )
+    LXML_PRESENT = True
+except ImportError:
+    LXML_PRESENT = False
+
+
+class BuiltInRegistryTest(unittest.TestCase):
+    """Test the built-in registry with the default builders registered."""
+
+    def test_combination(self):
+        if LXML_PRESENT:
+            self.assertEqual(registry.lookup('fast', 'html'),
+                             LXMLTreeBuilder)
+
+        if LXML_PRESENT:
+            self.assertEqual(registry.lookup('permissive', 'xml'),
+                             LXMLTreeBuilderForXML)
+        self.assertEqual(registry.lookup('strict', 'html'),
+                          HTMLParserTreeBuilder)
+        if HTML5LIB_PRESENT:
+            self.assertEqual(registry.lookup('html5lib', 'html'),
+                              HTML5TreeBuilder)
+
+    def test_lookup_by_markup_type(self):
+        if LXML_PRESENT:
+            self.assertEqual(registry.lookup('html'), LXMLTreeBuilder)
+            self.assertEqual(registry.lookup('xml'), LXMLTreeBuilderForXML)
+        else:
+            self.assertEqual(registry.lookup('xml'), None)
+            if HTML5LIB_PRESENT:
+                self.assertEqual(registry.lookup('html'), HTML5TreeBuilder)
+            else:
+                self.assertEqual(registry.lookup('html'), HTMLParserTreeBuilder)
+
+    def test_named_library(self):
+        if LXML_PRESENT:
+            self.assertEqual(registry.lookup('lxml', 'xml'),
+                             LXMLTreeBuilderForXML)
+            self.assertEqual(registry.lookup('lxml', 'html'),
+                             LXMLTreeBuilder)
+        if HTML5LIB_PRESENT:
+            self.assertEqual(registry.lookup('html5lib'),
+                              HTML5TreeBuilder)
+
+        self.assertEqual(registry.lookup('html.parser'),
+                          HTMLParserTreeBuilder)
+
+    def test_beautifulsoup_constructor_does_lookup(self):
+        # You can pass in a string.
+        BeautifulSoup("", features="html")
+        # Or a list of strings.
+        BeautifulSoup("", features=["html", "fast"])
+
+        # You'll get an exception if BS can't find an appropriate
+        # builder.
+        self.assertRaises(ValueError, BeautifulSoup,
+                          "", features="no-such-feature")
+
+class RegistryTest(unittest.TestCase):
+    """Test the TreeBuilderRegistry class in general."""
+
+    def setUp(self):
+        self.registry = TreeBuilderRegistry()
+
+    def builder_for_features(self, *feature_list):
+        cls = type('Builder_' + '_'.join(feature_list),
+                   (object,), {'features' : feature_list})
+
+        self.registry.register(cls)
+        return cls
+
+    def test_register_with_no_features(self):
+        builder = self.builder_for_features()
+
+        # Since the builder advertises no features, you can't find it
+        # by looking up features.
+        self.assertEqual(self.registry.lookup('foo'), None)
+
+        # But you can find it by doing a lookup with no features, if
+        # this happens to be the only registered builder.
+        self.assertEqual(self.registry.lookup(), builder)
+
+    def test_register_with_features_makes_lookup_succeed(self):
+        builder = self.builder_for_features('foo', 'bar')
+        self.assertEqual(self.registry.lookup('foo'), builder)
+        self.assertEqual(self.registry.lookup('bar'), builder)
+
+    def test_lookup_fails_when_no_builder_implements_feature(self):
+        builder = self.builder_for_features('foo', 'bar')
+        self.assertEqual(self.registry.lookup('baz'), None)
+
+    def test_lookup_gets_most_recent_registration_when_no_feature_specified(self):
+        builder1 = self.builder_for_features('foo')
+        builder2 = self.builder_for_features('bar')
+        self.assertEqual(self.registry.lookup(), builder2)
+
+    def test_lookup_fails_when_no_tree_builders_registered(self):
+        self.assertEqual(self.registry.lookup(), None)
+
+    def test_lookup_gets_most_recent_builder_supporting_all_features(self):
+        has_one = self.builder_for_features('foo')
+        has_the_other = self.builder_for_features('bar')
+        has_both_early = self.builder_for_features('foo', 'bar', 'baz')
+        has_both_late = self.builder_for_features('foo', 'bar', 'quux')
+        lacks_one = self.builder_for_features('bar')
+        has_the_other = self.builder_for_features('foo')
+
+        # There are two builders featuring 'foo' and 'bar', but
+        # the one that also features 'quux' was registered later.
+        self.assertEqual(self.registry.lookup('foo', 'bar'),
+                          has_both_late)
+
+        # There is only one builder featuring 'foo', 'bar', and 'baz'.
+        self.assertEqual(self.registry.lookup('foo', 'bar', 'baz'),
+                          has_both_early)
+
+    def test_lookup_fails_when_cannot_reconcile_requested_features(self):
+        builder1 = self.builder_for_features('foo', 'bar')
+        builder2 = self.builder_for_features('foo', 'baz')
+        self.assertEqual(self.registry.lookup('bar', 'baz'), None)
diff --git a/updater/bs4/tests/test_docs.py b/updater/bs4/tests/test_docs.py
new file mode 100644
index 0000000..5b9f677
--- /dev/null
+++ b/updater/bs4/tests/test_docs.py
@@ -0,0 +1,36 @@
+"Test harness for doctests."
+
+# pylint: disable-msg=E0611,W0142
+
+__metaclass__ = type
+__all__ = [
+    'additional_tests',
+    ]
+
+import atexit
+import doctest
+import os
+#from pkg_resources import (
+#    resource_filename, resource_exists, resource_listdir, cleanup_resources)
+import unittest
+
+DOCTEST_FLAGS = (
+    doctest.ELLIPSIS |
+    doctest.NORMALIZE_WHITESPACE |
+    doctest.REPORT_NDIFF)
+
+
+# def additional_tests():
+#     "Run the doc tests (README.txt and docs/*, if any exist)"
+#     doctest_files = [
+#         os.path.abspath(resource_filename('bs4', 'README.txt'))]
+#     if resource_exists('bs4', 'docs'):
+#         for name in resource_listdir('bs4', 'docs'):
+#             if name.endswith('.txt'):
+#                 doctest_files.append(
+#                     os.path.abspath(
+#                         resource_filename('bs4', 'docs/%s' % name)))
+#     kwargs = dict(module_relative=False, optionflags=DOCTEST_FLAGS)
+#     atexit.register(cleanup_resources)
+#     return unittest.TestSuite((
+#         doctest.DocFileSuite(*doctest_files, **kwargs)))
diff --git a/updater/bs4/tests/test_html5lib.py b/updater/bs4/tests/test_html5lib.py
new file mode 100644
index 0000000..0e1c1d8
--- /dev/null
+++ b/updater/bs4/tests/test_html5lib.py
@@ -0,0 +1,72 @@
+"""Tests to ensure that the html5lib tree builder generates good trees."""
+
+import warnings
+
+try:
+    from bs4.builder import HTML5TreeBuilder
+    HTML5LIB_PRESENT = True
+except ImportError, e:
+    HTML5LIB_PRESENT = False
+from bs4.element import SoupStrainer
+from bs4.testing import (
+    HTML5TreeBuilderSmokeTest,
+    SoupTest,
+    skipIf,
+)
+
+@skipIf(
+    not HTML5LIB_PRESENT,
+    "html5lib seems not to be present, not testing its tree builder.")
+class HTML5LibBuilderSmokeTest(SoupTest, HTML5TreeBuilderSmokeTest):
+    """See ``HTML5TreeBuilderSmokeTest``."""
+
+    @property
+    def default_builder(self):
+        return HTML5TreeBuilder()
+
+    def test_soupstrainer(self):
+        # The html5lib tree builder does not support SoupStrainers.
+        strainer = SoupStrainer("b")
+        markup = "
A bold statement.
"
+        with warnings.catch_warnings(record=True) as w:
+            soup = self.soup(markup, parse_only=strainer)
+        self.assertEqual(
+            soup.decode(), self.document_for(markup))
+
+        self.assertTrue(
+            "the html5lib tree builder doesn't support parse_only" in
+            str(w[0].message))
+
+    def test_correctly_nested_tables(self):
+        """html5lib inserts  tags where other parsers don't."""
+        markup = (''
+                  ''
+                  "')
+
+        self.assertSoupEquals(
+            markup,
+            '
Here's another table:"
+                  ''
+                  ''
+                  '
foo
Here\'s another table:'
+            '
foo
'
+            '
')
+
+        self.assertSoupEquals(
+            ""
+            ""
+            "
Foo
Bar
Baz
")
+
+    def test_xml_declaration_followed_by_doctype(self):
+        markup = '''
+
+
+  
+  
+  
+   
foo

+  
+'''
+        soup = self.soup(markup)
+        # Verify that we can reach the 
 tag; this means the tree is connected.
+        self.assertEquals("
foo
", soup.p.encode())
diff --git a/updater/bs4/tests/test_htmlparser.py b/updater/bs4/tests/test_htmlparser.py
new file mode 100644
index 0000000..bcb5ed2
--- /dev/null
+++ b/updater/bs4/tests/test_htmlparser.py
@@ -0,0 +1,19 @@
+"""Tests to ensure that the html.parser tree builder generates good
+trees."""
+
+from bs4.testing import SoupTest, HTMLTreeBuilderSmokeTest
+from bs4.builder import HTMLParserTreeBuilder
+
+class HTMLParserTreeBuilderSmokeTest(SoupTest, HTMLTreeBuilderSmokeTest):
+
+    @property
+    def default_builder(self):
+        return HTMLParserTreeBuilder()
+
+    def test_namespaced_system_doctype(self):
+        # html.parser can't handle namespaced doctypes, so skip this one.
+        pass
+
+    def test_namespaced_public_doctype(self):
+        # html.parser can't handle namespaced doctypes, so skip this one.
+        pass
diff --git a/updater/bs4/tests/test_lxml.py b/updater/bs4/tests/test_lxml.py
new file mode 100644
index 0000000..39e26bf
--- /dev/null
+++ b/updater/bs4/tests/test_lxml.py
@@ -0,0 +1,75 @@
+"""Tests to ensure that the lxml tree builder generates good trees."""
+
+import re
+import warnings
+
+try:
+    from bs4.builder import LXMLTreeBuilder, LXMLTreeBuilderForXML
+    LXML_PRESENT = True
+except ImportError, e:
+    LXML_PRESENT = False
+
+from bs4 import (
+    BeautifulSoup,
+    BeautifulStoneSoup,
+    )
+from bs4.element import Comment, Doctype, SoupStrainer
+from bs4.testing import skipIf
+from bs4.tests import test_htmlparser
+from bs4.testing import (
+    HTMLTreeBuilderSmokeTest,
+    XMLTreeBuilderSmokeTest,
+    SoupTest,
+    skipIf,
+)
+
+@skipIf(
+    not LXML_PRESENT,
+    "lxml seems not to be present, not testing its tree builder.")
+class LXMLTreeBuilderSmokeTest(SoupTest, HTMLTreeBuilderSmokeTest):
+    """See ``HTMLTreeBuilderSmokeTest``."""
+
+    @property
+    def default_builder(self):
+        return LXMLTreeBuilder()
+
+    def test_out_of_range_entity(self):
+        self.assertSoupEquals(
+            "
foo�bar
", "
foobar
")
+        self.assertSoupEquals(
+            "
foo�bar
", "
foobar
")
+        self.assertSoupEquals(
+            "
foo�bar
", "
foobar
")
+
+    def test_beautifulstonesoup_is_xml_parser(self):
+        # Make sure that the deprecated BSS class uses an xml builder
+        # if one is installed.
+        with warnings.catch_warnings(record=False) as w:
+            soup = BeautifulStoneSoup("")
+            self.assertEqual(u"", unicode(soup.b))
+
+    def test_real_xhtml_document(self):
+        """lxml strips the XML definition from an XHTML doc, which is fine."""
+        markup = b"""
+
+
+Hello.
+Goodbye.
+"""
+        soup = self.soup(markup)
+        self.assertEqual(
+            soup.encode("utf-8").replace(b"\n", b''),
+            markup.replace(b'\n', b'').replace(
+                b'', b''))
+
+
+@skipIf(
+    not LXML_PRESENT,
+    "lxml seems not to be present, not testing its XML tree builder.")
+class LXMLXMLTreeBuilderSmokeTest(SoupTest, XMLTreeBuilderSmokeTest):
+    """See ``HTMLTreeBuilderSmokeTest``."""
+
+    @property
+    def default_builder(self):
+        return LXMLTreeBuilderForXML()
+
diff --git a/updater/bs4/tests/test_soup.py b/updater/bs4/tests/test_soup.py
new file mode 100644
index 0000000..dd636d8
--- /dev/null
+++ b/updater/bs4/tests/test_soup.py
@@ -0,0 +1,378 @@
+# -*- coding: utf-8 -*-
+"""Tests of Beautiful Soup as a whole."""
+
+import logging
+import unittest
+import sys
+from bs4 import (
+    BeautifulSoup,
+    BeautifulStoneSoup,
+)
+from bs4.element import (
+    CharsetMetaAttributeValue,
+    ContentMetaAttributeValue,
+    SoupStrainer,
+    NamespacedAttribute,
+    )
+import bs4.dammit
+from bs4.dammit import EntitySubstitution, UnicodeDammit
+from bs4.testing import (
+    SoupTest,
+    skipIf,
+)
+import warnings
+
+try:
+    from bs4.builder import LXMLTreeBuilder, LXMLTreeBuilderForXML
+    LXML_PRESENT = True
+except ImportError, e:
+    LXML_PRESENT = False
+
+PYTHON_2_PRE_2_7 = (sys.version_info < (2,7))
+PYTHON_3_PRE_3_2 = (sys.version_info[0] == 3 and sys.version_info < (3,2))
+
+class TestDeprecatedConstructorArguments(SoupTest):
+
+    def test_parseOnlyThese_renamed_to_parse_only(self):
+        with warnings.catch_warnings(record=True) as w:
+            soup = self.soup("", parseOnlyThese=SoupStrainer("b"))
+        msg = str(w[0].message)
+        self.assertTrue("parseOnlyThese" in msg)
+        self.assertTrue("parse_only" in msg)
+        self.assertEqual(b"", soup.encode())
+
+    def test_fromEncoding_renamed_to_from_encoding(self):
+        with warnings.catch_warnings(record=True) as w:
+            utf8 = b"\xc3\xa9"
+            soup = self.soup(utf8, fromEncoding="utf8")
+        msg = str(w[0].message)
+        self.assertTrue("fromEncoding" in msg)
+        self.assertTrue("from_encoding" in msg)
+        self.assertEqual("utf8", soup.original_encoding)
+
+    def test_unrecognized_keyword_argument(self):
+        self.assertRaises(
+            TypeError, self.soup, "", no_such_argument=True)
+
+    @skipIf(
+        not LXML_PRESENT,
+        "lxml not present, not testing BeautifulStoneSoup.")
+    def test_beautifulstonesoup(self):
+        with warnings.catch_warnings(record=True) as w:
+            soup = BeautifulStoneSoup("")
+            self.assertTrue(isinstance(soup, BeautifulSoup))
+            self.assertTrue("BeautifulStoneSoup class is deprecated")
+
+class TestSelectiveParsing(SoupTest):
+
+    def test_parse_with_soupstrainer(self):
+        markup = "NoYesNoYes Yes"
+        strainer = SoupStrainer("b")
+        soup = self.soup(markup, parse_only=strainer)
+        self.assertEqual(soup.encode(), b"YesYes Yes")
+
+
+class TestEntitySubstitution(unittest.TestCase):
+    """Standalone tests of the EntitySubstitution class."""
+    def setUp(self):
+        self.sub = EntitySubstitution
+
+    def test_simple_html_substitution(self):
+        # Unicode characters corresponding to named HTML entites
+        # are substituted, and no others.
+        s = u"foo\u2200\N{SNOWMAN}\u00f5bar"
+        self.assertEqual(self.sub.substitute_html(s),
+                          u"foo∀\N{SNOWMAN}õbar")
+
+    def test_smart_quote_substitution(self):
+        # MS smart quotes are a common source of frustration, so we
+        # give them a special test.
+        quotes = b"\x91\x92foo\x93\x94"
+        dammit = UnicodeDammit(quotes)
+        self.assertEqual(self.sub.substitute_html(dammit.markup),
+                          "‘’foo“”")
+
+    def test_xml_converstion_includes_no_quotes_if_make_quoted_attribute_is_false(self):
+        s = 'Welcome to "my bar"'
+        self.assertEqual(self.sub.substitute_xml(s, False), s)
+
+    def test_xml_attribute_quoting_normally_uses_double_quotes(self):
+        self.assertEqual(self.sub.substitute_xml("Welcome", True),
+                          '"Welcome"')
+        self.assertEqual(self.sub.substitute_xml("Bob's Bar", True),
+                          '"Bob\'s Bar"')
+
+    def test_xml_attribute_quoting_uses_single_quotes_when_value_contains_double_quotes(self):
+        s = 'Welcome to "my bar"'
+        self.assertEqual(self.sub.substitute_xml(s, True),
+                          "'Welcome to \"my bar\"'")
+
+    def test_xml_attribute_quoting_escapes_single_quotes_when_value_contains_both_single_and_double_quotes(self):
+        s = 'Welcome to "Bob\'s Bar"'
+        self.assertEqual(
+            self.sub.substitute_xml(s, True),
+            '"Welcome to "Bob\'s Bar""')
+
+    def test_xml_quotes_arent_escaped_when_value_is_not_being_quoted(self):
+        quoted = 'Welcome to "Bob\'s Bar"'
+        self.assertEqual(self.sub.substitute_xml(quoted), quoted)
+
+    def test_xml_quoting_handles_angle_brackets(self):
+        self.assertEqual(
+            self.sub.substitute_xml("foo"),
+            "foo<bar>")
+
+    def test_xml_quoting_handles_ampersands(self):
+        self.assertEqual(self.sub.substitute_xml("AT&T"), "AT&T")
+
+    def test_xml_quoting_ignores_ampersands_when_they_are_part_of_an_entity(self):
+        self.assertEqual(
+            self.sub.substitute_xml("ÁT&T"),
+            "ÁT&T")
+
+    def test_quotes_not_html_substituted(self):
+        """There's no need to do this except inside attribute values."""
+        text = 'Bob\'s "bar"'
+        self.assertEqual(self.sub.substitute_html(text), text)
+
+
+class TestEncodingConversion(SoupTest):
+    # Test Beautiful Soup's ability to decode and encode from various
+    # encodings.
+
+    def setUp(self):
+        super(TestEncodingConversion, self).setUp()
+        self.unicode_data = u'Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!'
+        self.utf8_data = self.unicode_data.encode("utf-8")
+        # Just so you know what it looks like.
+        self.assertEqual(
+            self.utf8_data,
+            b'Sacr\xc3\xa9 bleu!')
+
+    def test_ascii_in_unicode_out(self):
+        # ASCII input is converted to Unicode. The original_encoding
+        # attribute is set.
+        ascii = b"a"
+        soup_from_ascii = self.soup(ascii)
+        unicode_output = soup_from_ascii.decode()
+        self.assertTrue(isinstance(unicode_output, unicode))
+        self.assertEqual(unicode_output, self.document_for(ascii.decode()))
+        self.assertEqual(soup_from_ascii.original_encoding.lower(), "ascii")
+
+    def test_unicode_in_unicode_out(self):
+        # Unicode input is left alone. The original_encoding attribute
+        # is not set.
+        soup_from_unicode = self.soup(self.unicode_data)
+        self.assertEqual(soup_from_unicode.decode(), self.unicode_data)
+        self.assertEqual(soup_from_unicode.foo.string, u'Sacr\xe9 bleu!')
+        self.assertEqual(soup_from_unicode.original_encoding, None)
+
+    def test_utf8_in_unicode_out(self):
+        # UTF-8 input is converted to Unicode. The original_encoding
+        # attribute is set.
+        soup_from_utf8 = self.soup(self.utf8_data)
+        self.assertEqual(soup_from_utf8.decode(), self.unicode_data)
+        self.assertEqual(soup_from_utf8.foo.string, u'Sacr\xe9 bleu!')
+
+    def test_utf8_out(self):
+        # The internal data structures can be encoded as UTF-8.
+        soup_from_unicode = self.soup(self.unicode_data)
+        self.assertEqual(soup_from_unicode.encode('utf-8'), self.utf8_data)
+
+    @skipIf(
+        PYTHON_2_PRE_2_7 or PYTHON_3_PRE_3_2,
+        "Bad HTMLParser detected; skipping test of non-ASCII characters in attribute name.")
+    def test_attribute_name_containing_unicode_characters(self):
+        markup = u'
'
+        self.assertEqual(self.soup(markup).div.encode("utf8"), markup.encode("utf8"))
+
+class TestUnicodeDammit(unittest.TestCase):
+    """Standalone tests of Unicode, Dammit."""
+
+    def test_smart_quotes_to_unicode(self):
+        markup = b"\x91\x92\x93\x94"
+        dammit = UnicodeDammit(markup)
+        self.assertEqual(
+            dammit.unicode_markup, u"\u2018\u2019\u201c\u201d")
+
+    def test_smart_quotes_to_xml_entities(self):
+        markup = b"\x91\x92\x93\x94"
+        dammit = UnicodeDammit(markup, smart_quotes_to="xml")
+        self.assertEqual(
+            dammit.unicode_markup, "‘’“”")
+
+    def test_smart_quotes_to_html_entities(self):
+        markup = b"\x91\x92\x93\x94"
+        dammit = UnicodeDammit(markup, smart_quotes_to="html")
+        self.assertEqual(
+            dammit.unicode_markup, "‘’“”")
+
+    def test_smart_quotes_to_ascii(self):
+        markup = b"\x91\x92\x93\x94"
+        dammit = UnicodeDammit(markup, smart_quotes_to="ascii")
+        self.assertEqual(
+            dammit.unicode_markup, """''""""")
+
+    def test_detect_utf8(self):
+        utf8 = b"\xc3\xa9"
+        dammit = UnicodeDammit(utf8)
+        self.assertEqual(dammit.unicode_markup, u'\xe9')
+        self.assertEqual(dammit.original_encoding.lower(), 'utf-8')
+
+    def test_convert_hebrew(self):
+        hebrew = b"\xed\xe5\xec\xf9"
+        dammit = UnicodeDammit(hebrew, ["iso-8859-8"])
+        self.assertEqual(dammit.original_encoding.lower(), 'iso-8859-8')
+        self.assertEqual(dammit.unicode_markup, u'\u05dd\u05d5\u05dc\u05e9')
+
+    def test_dont_see_smart_quotes_where_there_are_none(self):
+        utf_8 = b"\343\202\261\343\203\274\343\202\277\343\202\244 Watch"
+        dammit = UnicodeDammit(utf_8)
+        self.assertEqual(dammit.original_encoding.lower(), 'utf-8')
+        self.assertEqual(dammit.unicode_markup.encode("utf-8"), utf_8)
+
+    def test_ignore_inappropriate_codecs(self):
+        utf8_data = u"Räksmörgås".encode("utf-8")
+        dammit = UnicodeDammit(utf8_data, ["iso-8859-8"])
+        self.assertEqual(dammit.original_encoding.lower(), 'utf-8')
+
+    def test_ignore_invalid_codecs(self):
+        utf8_data = u"Räksmörgås".encode("utf-8")
+        for bad_encoding in ['.utf8', '...', 'utF---16.!']:
+            dammit = UnicodeDammit(utf8_data, [bad_encoding])
+            self.assertEqual(dammit.original_encoding.lower(), 'utf-8')
+
+    def test_detect_html5_style_meta_tag(self):
+
+        for data in (
+            b'',
+            b"",
+            b"",
+            b""):
+            dammit = UnicodeDammit(data, is_html=True)
+            self.assertEqual(
+                "euc-jp", dammit.original_encoding)
+
+    def test_last_ditch_entity_replacement(self):
+        # This is a UTF-8 document that contains bytestrings
+        # completely incompatible with UTF-8 (ie. encoded with some other
+        # encoding).
+        #
+        # Since there is no consistent encoding for the document,
+        # Unicode, Dammit will eventually encode the document as UTF-8
+        # and encode the incompatible characters as REPLACEMENT
+        # CHARACTER.
+        #
+        # If chardet is installed, it will detect that the document
+        # can be converted into ISO-8859-1 without errors. This happens
+        # to be the wrong encoding, but it is a consistent encoding, so the
+        # code we're testing here won't run.
+        #
+        # So we temporarily disable chardet if it's present.
+        doc = b"""\357\273\277
+\330\250\330\252\330\261
+\310\322\321\220\312\321\355\344"""
+        chardet = bs4.dammit.chardet_dammit
+        logging.disable(logging.WARNING)
+        try:
+            def noop(str):
+                return None
+            bs4.dammit.chardet_dammit = noop
+            dammit = UnicodeDammit(doc)
+            self.assertEqual(True, dammit.contains_replacement_characters)
+            self.assertTrue(u"\ufffd" in dammit.unicode_markup)
+
+            soup = BeautifulSoup(doc, "html.parser")
+            self.assertTrue(soup.contains_replacement_characters)
+        finally:
+            logging.disable(logging.NOTSET)
+            bs4.dammit.chardet_dammit = chardet
+
+    def test_sniffed_xml_encoding(self):
+        # A document written in UTF-16LE will be converted by a different
+        # code path that sniffs the byte order markers.
+        data = b'\xff\xfe<\x00a\x00>\x00\xe1\x00\xe9\x00<\x00/\x00a\x00>\x00'
+        dammit = UnicodeDammit(data)
+        self.assertEqual(u"áé", dammit.unicode_markup)
+        self.assertEqual("utf-16le", dammit.original_encoding)
+
+    def test_detwingle(self):
+        # Here's a UTF8 document.
+        utf8 = (u"\N{SNOWMAN}" * 3).encode("utf8")
+
+        # Here's a Windows-1252 document.
+        windows_1252 = (
+            u"\N{LEFT DOUBLE QUOTATION MARK}Hi, I like Windows!"
+            u"\N{RIGHT DOUBLE QUOTATION MARK}").encode("windows_1252")
+
+        # Through some unholy alchemy, they've been stuck together.
+        doc = utf8 + windows_1252 + utf8
+
+        # The document can't be turned into UTF-8:
+        self.assertRaises(UnicodeDecodeError, doc.decode, "utf8")
+
+        # Unicode, Dammit thinks the whole document is Windows-1252,
+        # and decodes it into "☃☃☃“Hi, I like Windows!”☃☃☃"
+
+        # But if we run it through fix_embedded_windows_1252, it's fixed:
+
+        fixed = UnicodeDammit.detwingle(doc)
+        self.assertEqual(
+            u"☃☃☃“Hi, I like Windows!”☃☃☃", fixed.decode("utf8"))
+
+    def test_detwingle_ignores_multibyte_characters(self):
+        # Each of these characters has a UTF-8 representation ending
+        # in \x93. \x93 is a smart quote if interpreted as
+        # Windows-1252. But our code knows to skip over multibyte
+        # UTF-8 characters, so they'll survive the process unscathed.
+        for tricky_unicode_char in (
+            u"\N{LATIN SMALL LIGATURE OE}", # 2-byte char '\xc5\x93'
+            u"\N{LATIN SUBSCRIPT SMALL LETTER X}", # 3-byte char '\xe2\x82\x93'
+            u"\xf0\x90\x90\x93", # This is a CJK character, not sure which one.
+            ):
+            input = tricky_unicode_char.encode("utf8")
+            self.assertTrue(input.endswith(b'\x93'))
+            output = UnicodeDammit.detwingle(input)
+            self.assertEqual(output, input)
+
+class TestNamedspacedAttribute(SoupTest):
+
+    def test_name_may_be_none(self):
+        a = NamespacedAttribute("xmlns", None)
+        self.assertEqual(a, "xmlns")
+
+    def test_attribute_is_equivalent_to_colon_separated_string(self):
+        a = NamespacedAttribute("a", "b")
+        self.assertEqual("a:b", a)
+
+    def test_attributes_are_equivalent_if_prefix_and_name_identical(self):
+        a = NamespacedAttribute("a", "b", "c")
+        b = NamespacedAttribute("a", "b", "c")
+        self.assertEqual(a, b)
+
+        # The actual namespace is not considered.
+        c = NamespacedAttribute("a", "b", None)
+        self.assertEqual(a, c)
+
+        # But name and prefix are important.
+        d = NamespacedAttribute("a", "z", "c")
+        self.assertNotEqual(a, d)
+
+        e = NamespacedAttribute("z", "b", "c")
+        self.assertNotEqual(a, e)
+
+
+class TestAttributeValueWithCharsetSubstitution(unittest.TestCase):
+
+    def test_content_meta_attribute_value(self):
+        value = CharsetMetaAttributeValue("euc-jp")
+        self.assertEqual("euc-jp", value)
+        self.assertEqual("euc-jp", value.original_value)
+        self.assertEqual("utf8", value.encode("utf8"))
+
+
+    def test_content_meta_attribute_value(self):
+        value = ContentMetaAttributeValue("text/html; charset=euc-jp")
+        self.assertEqual("text/html; charset=euc-jp", value)
+        self.assertEqual("text/html; charset=euc-jp", value.original_value)
+        self.assertEqual("text/html; charset=utf8", value.encode("utf8"))
diff --git a/updater/bs4/tests/test_tree.py b/updater/bs4/tests/test_tree.py
new file mode 100644
index 0000000..25a6e04
--- /dev/null
+++ b/updater/bs4/tests/test_tree.py
@@ -0,0 +1,1726 @@
+# -*- coding: utf-8 -*-
+"""Tests for Beautiful Soup's tree traversal methods.
+
+The tree traversal methods are the main advantage of using Beautiful
+Soup over just using a parser.
+
+Different parsers will build different Beautiful Soup trees given the
+same markup, but all Beautiful Soup trees can be traversed with the
+methods tested here.
+"""
+
+import copy
+import pickle
+import re
+import warnings
+from bs4 import BeautifulSoup
+from bs4.builder import (
+    builder_registry,
+    HTMLParserTreeBuilder,
+)
+from bs4.element import (
+    CData,
+    Doctype,
+    NavigableString,
+    SoupStrainer,
+    Tag,
+)
+from bs4.testing import (
+    SoupTest,
+    skipIf,
+)
+
+XML_BUILDER_PRESENT = (builder_registry.lookup("xml") is not None)
+LXML_PRESENT = (builder_registry.lookup("lxml") is not None)
+
+class TreeTest(SoupTest):
+
+    def assertSelects(self, tags, should_match):
+        """Make sure that the given tags have the correct text.
+
+        This is used in tests that define a bunch of tags, each
+        containing a single string, and then select certain strings by
+        some mechanism.
+        """
+        self.assertEqual([tag.string for tag in tags], should_match)
+
+    def assertSelectsIDs(self, tags, should_match):
+        """Make sure that the given tags have the correct IDs.
+
+        This is used in tests that define a bunch of tags, each
+        containing a single string, and then select certain strings by
+        some mechanism.
+        """
+        self.assertEqual([tag['id'] for tag in tags], should_match)
+
+
+class TestFind(TreeTest):
+    """Basic tests of the find() method.
+
+    find() just calls find_all() with limit=1, so it's not tested all
+    that thouroughly here.
+    """
+
+    def test_find_tag(self):
+        soup = self.soup("1234")
+        self.assertEqual(soup.find("b").string, "2")
+
+    def test_unicode_text_find(self):
+        soup = self.soup(u'
Räksmörgås
')
+        self.assertEqual(soup.find(text=u'Räksmörgås'), u'Räksmörgås')
+
+class TestFindAll(TreeTest):
+    """Basic tests of the find_all() method."""
+
+    def test_find_all_text_nodes(self):
+        """You can search the tree for text nodes."""
+        soup = self.soup("Foobar\xbb")
+        # Exact match.
+        self.assertEqual(soup.find_all(text="bar"), [u"bar"])
+        # Match any of a number of strings.
+        self.assertEqual(
+            soup.find_all(text=["Foo", "bar"]), [u"Foo", u"bar"])
+        # Match a regular expression.
+        self.assertEqual(soup.find_all(text=re.compile('.*')),
+                         [u"Foo", u"bar", u'\xbb'])
+        # Match anything.
+        self.assertEqual(soup.find_all(text=True),
+                         [u"Foo", u"bar", u'\xbb'])
+
+    def test_find_all_limit(self):
+        """You can limit the number of items returned by find_all."""
+        soup = self.soup("12345")
+        self.assertSelects(soup.find_all('a', limit=3), ["1", "2", "3"])
+        self.assertSelects(soup.find_all('a', limit=1), ["1"])
+        self.assertSelects(
+            soup.find_all('a', limit=10), ["1", "2", "3", "4", "5"])
+
+        # A limit of 0 means no limit.
+        self.assertSelects(
+            soup.find_all('a', limit=0), ["1", "2", "3", "4", "5"])
+
+    def test_calling_a_tag_is_calling_findall(self):
+        soup = self.soup("123")
+        self.assertSelects(soup('a', limit=1), ["1"])
+        self.assertSelects(soup.b(id="foo"), ["3"])
+
+    def test_find_all_with_self_referential_data_structure_does_not_cause_infinite_recursion(self):
+        soup = self.soup("")
+        # Create a self-referential list.
+        l = []
+        l.append(l)
+
+        # Without special code in _normalize_search_value, this would cause infinite
+        # recursion.
+        self.assertEqual([], soup.find_all(l))
+
+class TestFindAllBasicNamespaces(TreeTest):
+
+    def test_find_by_namespaced_name(self):
+        soup = self.soup('4')
+        self.assertEqual("4", soup.find("mathml:msqrt").string)
+        self.assertEqual("a", soup.find(attrs= { "svg:fill" : "red" }).name)
+
+
+class TestFindAllByName(TreeTest):
+    """Test ways of finding tags by tag name."""
+
+    def setUp(self):
+        super(TreeTest, self).setUp()
+        self.tree =  self.soup("""First tag.
+                                  Second tag.
+                                  Third Nested tag. tag.""")
+
+    def test_find_all_by_tag_name(self):
+        # Find all the  tags.
+        self.assertSelects(
+            self.tree.find_all('a'), ['First tag.', 'Nested tag.'])
+
+    def test_find_all_by_name_and_text(self):
+        self.assertSelects(
+            self.tree.find_all('a', text='First tag.'), ['First tag.'])
+
+        self.assertSelects(
+            self.tree.find_all('a', text=True), ['First tag.', 'Nested tag.'])
+
+        self.assertSelects(
+            self.tree.find_all('a', text=re.compile("tag")),
+            ['First tag.', 'Nested tag.'])
+
+
+    def test_find_all_on_non_root_element(self):
+        # You can call find_all on any node, not just the root.
+        self.assertSelects(self.tree.c.find_all('a'), ['Nested tag.'])
+
+    def test_calling_element_invokes_find_all(self):
+        self.assertSelects(self.tree('a'), ['First tag.', 'Nested tag.'])
+
+    def test_find_all_by_tag_strainer(self):
+        self.assertSelects(
+            self.tree.find_all(SoupStrainer('a')),
+            ['First tag.', 'Nested tag.'])
+
+    def test_find_all_by_tag_names(self):
+        self.assertSelects(
+            self.tree.find_all(['a', 'b']),
+            ['First tag.', 'Second tag.', 'Nested tag.'])
+
+    def test_find_all_by_tag_dict(self):
+        self.assertSelects(
+            self.tree.find_all({'a' : True, 'b' : True}),
+            ['First tag.', 'Second tag.', 'Nested tag.'])
+
+    def test_find_all_by_tag_re(self):
+        self.assertSelects(
+            self.tree.find_all(re.compile('^[ab]$')),
+            ['First tag.', 'Second tag.', 'Nested tag.'])
+
+    def test_find_all_with_tags_matching_method(self):
+        # You can define an oracle method that determines whether
+        # a tag matches the search.
+        def id_matches_name(tag):
+            return tag.name == tag.get('id')
+
+        tree = self.soup("""Match 1.
+                            Does not match.
+                            Match 2.""")
+
+        self.assertSelects(
+            tree.find_all(id_matches_name), ["Match 1.", "Match 2."])
+
+
+class TestFindAllByAttribute(TreeTest):
+
+    def test_find_all_by_attribute_name(self):
+        # You can pass in keyword arguments to find_all to search by
+        # attribute.
+        tree = self.soup("""
+                         Matching a.
+                         
+                          Non-matching Matching b.a.
+                         """)
+        self.assertSelects(tree.find_all(id='first'),
+                           ["Matching a.", "Matching b."])
+
+    def test_find_all_by_utf8_attribute_value(self):
+        peace = u"םולש".encode("utf8")
+        data = u''.encode("utf8")
+        soup = self.soup(data)
+        self.assertEqual([soup.a], soup.find_all(title=peace))
+        self.assertEqual([soup.a], soup.find_all(title=peace.decode("utf8")))
+        self.assertEqual([soup.a], soup.find_all(title=[peace, "something else"]))
+
+    def test_find_all_by_attribute_dict(self):
+        # You can pass in a dictionary as the argument 'attrs'. This
+        # lets you search for attributes like 'name' (a fixed argument
+        # to find_all) and 'class' (a reserved word in Python.)
+        tree = self.soup("""
+                         Name match.
+                         Class match.
+                         Non-match.
+                         A tag called 'name1'.
+                         """)
+
+        # This doesn't do what you want.
+        self.assertSelects(tree.find_all(name='name1'),
+                           ["A tag called 'name1'."])
+        # This does what you want.
+        self.assertSelects(tree.find_all(attrs={'name' : 'name1'}),
+                           ["Name match."])
+
+        self.assertSelects(tree.find_all(attrs={'class' : 'class2'}),
+                           ["Class match."])
+
+    def test_find_all_by_class(self):
+        tree = self.soup("""
+                         Class 1.
+                         Class 2.
+                         Class 1.
+                         Class 3 and 4.
+                         """)
+
+        # Passing in the class_ keyword argument will search against
+        # the 'class' attribute.
+        self.assertSelects(tree.find_all('a', class_='1'), ['Class 1.'])
+        self.assertSelects(tree.find_all('c', class_='3'), ['Class 3 and 4.'])
+        self.assertSelects(tree.find_all('c', class_='4'), ['Class 3 and 4.'])
+
+        # Passing in a string to 'attrs' will also search the CSS class.
+        self.assertSelects(tree.find_all('a', '1'), ['Class 1.'])
+        self.assertSelects(tree.find_all(attrs='1'), ['Class 1.', 'Class 1.'])
+        self.assertSelects(tree.find_all('c', '3'), ['Class 3 and 4.'])
+        self.assertSelects(tree.find_all('c', '4'), ['Class 3 and 4.'])
+
+    def test_find_by_class_when_multiple_classes_present(self):
+        tree = self.soup("Found it")
+
+        f = tree.find_all("gar", class_=re.compile("o"))
+        self.assertSelects(f, ["Found it"])
+
+        f = tree.find_all("gar", class_=re.compile("a"))
+        self.assertSelects(f, ["Found it"])
+
+        # Since the class is not the string "foo bar", but the two
+        # strings "foo" and "bar", this will not find anything.
+        f = tree.find_all("gar", class_=re.compile("o b"))
+        self.assertSelects(f, [])
+
+    def test_find_all_with_non_dictionary_for_attrs_finds_by_class(self):
+        soup = self.soup("Found it")
+
+        self.assertSelects(soup.find_all("a", re.compile("ba")), ["Found it"])
+
+        def big_attribute_value(value):
+            return len(value) > 3
+
+        self.assertSelects(soup.find_all("a", big_attribute_value), [])
+
+        def small_attribute_value(value):
+            return len(value) <= 3
+
+        self.assertSelects(
+            soup.find_all("a", small_attribute_value), ["Found it"])
+
+    def test_find_all_with_string_for_attrs_finds_multiple_classes(self):
+        soup = self.soup('')
+        a, a2 = soup.find_all("a")
+        self.assertEqual([a, a2], soup.find_all("a", "foo"))
+        self.assertEqual([a], soup.find_all("a", "bar"))
+
+        # If you specify the class as a string that contains a
+        # space, only that specific value will be found.
+        self.assertEqual([a], soup.find_all("a", class_="foo bar"))
+        self.assertEqual([a], soup.find_all("a", "foo bar"))
+        self.assertEqual([], soup.find_all("a", "bar foo"))
+
+    def test_find_all_by_attribute_soupstrainer(self):
+        tree = self.soup("""
+                         Match.
+                         Non-match.""")
+
+        strainer = SoupStrainer(attrs={'id' : 'first'})
+        self.assertSelects(tree.find_all(strainer), ['Match.'])
+
+    def test_find_all_with_missing_atribute(self):
+        # You can pass in None as the value of an attribute to find_all.
+        # This will match tags that do not have that attribute set.
+        tree = self.soup("""ID present.
+                            No ID present.
+                            ID is empty.""")
+        self.assertSelects(tree.find_all('a', id=None), ["No ID present."])
+
+    def test_find_all_with_defined_attribute(self):
+        # You can pass in None as the value of an attribute to find_all.
+        # This will match tags that have that attribute set to any value.
+        tree = self.soup("""ID present.
+                            No ID present.
+                            ID is empty.""")
+        self.assertSelects(
+            tree.find_all(id=True), ["ID present.", "ID is empty."])
+
+    def test_find_all_with_numeric_attribute(self):
+        # If you search for a number, it's treated as a string.
+        tree = self.soup("""Unquoted attribute.
+                            Quoted attribute.""")
+
+        expected = ["Unquoted attribute.", "Quoted attribute."]
+        self.assertSelects(tree.find_all(id=1), expected)
+        self.assertSelects(tree.find_all(id="1"), expected)
+
+    def test_find_all_with_list_attribute_values(self):
+        # You can pass a list of attribute values instead of just one,
+        # and you'll get tags that match any of the values.
+        tree = self.soup("""1
+                            2
+                            3
+                            No ID.""")
+        self.assertSelects(tree.find_all(id=["1", "3", "4"]),
+                           ["1", "3"])
+
+    def test_find_all_with_regular_expression_attribute_value(self):
+        # You can pass a regular expression as an attribute value, and
+        # you'll get tags whose values for that attribute match the
+        # regular expression.
+        tree = self.soup("""One a.
+                            Two as.
+                            Mixed as and bs.
+                            One b.
+                            No ID.""")
+
+        self.assertSelects(tree.find_all(id=re.compile("^a+$")),
+                           ["One a.", "Two as."])
+
+    def test_find_by_name_and_containing_string(self):
+        soup = self.soup("foobarfoo")
+        a = soup.a
+
+        self.assertEqual([a], soup.find_all("a", text="foo"))
+        self.assertEqual([], soup.find_all("a", text="bar"))
+        self.assertEqual([], soup.find_all("a", text="bar"))
+
+    def test_find_by_name_and_containing_string_when_string_is_buried(self):
+        soup = self.soup("foofoo")
+        self.assertEqual(soup.find_all("a"), soup.find_all("a", text="foo"))
+
+    def test_find_by_attribute_and_containing_string(self):
+        soup = self.soup('foofoo')
+        a = soup.a
+
+        self.assertEqual([a], soup.find_all(id=2, text="foo"))
+        self.assertEqual([], soup.find_all(id=1, text="bar"))
+
+
+
+
+class TestIndex(TreeTest):
+    """Test Tag.index"""
+    def test_index(self):
+        tree = self.soup("""

+                            Identical
+                            Not identical
+                            Identical
+
+                            Identical with child
+                            Also not identical
+                            Identical with child
+                            
""")
+        div = tree.div
+        for i, element in enumerate(div.contents):
+            self.assertEqual(i, div.index(element))
+        self.assertRaises(ValueError, tree.index, 1)
+
+
+class TestParentOperations(TreeTest):
+    """Test navigation and searching through an element's parents."""
+
+    def setUp(self):
+        super(TestParentOperations, self).setUp()
+        self.tree = self.soup('''
    
+                                 
      
+                                  
        
+                                   
          
+                                    Start here
+                                   
        
+                                  
      ''')
+        self.start = self.tree.b
+
+
+    def test_parent(self):
+        self.assertEqual(self.start.parent['id'], 'bottom')
+        self.assertEqual(self.start.parent.parent['id'], 'middle')
+        self.assertEqual(self.start.parent.parent.parent['id'], 'top')
+
+    def test_parent_of_top_tag_is_soup_object(self):
+        top_tag = self.tree.contents[0]
+        self.assertEqual(top_tag.parent, self.tree)
+
+    def test_soup_object_has_no_parent(self):
+        self.assertEqual(None, self.tree.parent)
+
+    def test_find_parents(self):
+        self.assertSelectsIDs(
+            self.start.find_parents('ul'), ['bottom', 'middle', 'top'])
+        self.assertSelectsIDs(
+            self.start.find_parents('ul', id="middle"), ['middle'])
+
+    def test_find_parent(self):
+        self.assertEqual(self.start.find_parent('ul')['id'], 'bottom')
+
+    def test_parent_of_text_element(self):
+        text = self.tree.find(text="Start here")
+        self.assertEqual(text.parent.name, 'b')
+
+    def test_text_element_find_parent(self):
+        text = self.tree.find(text="Start here")
+        self.assertEqual(text.find_parent('ul')['id'], 'bottom')
+
+    def test_parent_generator(self):
+        parents = [parent['id'] for parent in self.start.parents
+                   if parent is not None and 'id' in parent.attrs]
+        self.assertEqual(parents, ['bottom', 'middle', 'top'])
+
+
+class ProximityTest(TreeTest):
+
+    def setUp(self):
+        super(TreeTest, self).setUp()
+        self.tree = self.soup(
+            'OneTwoThree')
+
+
+class TestNextOperations(ProximityTest):
+
+    def setUp(self):
+        super(TestNextOperations, self).setUp()
+        self.start = self.tree.b
+
+    def test_next(self):
+        self.assertEqual(self.start.next_element, "One")
+        self.assertEqual(self.start.next_element.next_element['id'], "2")
+
+    def test_next_of_last_item_is_none(self):
+        last = self.tree.find(text="Three")
+        self.assertEqual(last.next_element, None)
+
+    def test_next_of_root_is_none(self):
+        # The document root is outside the next/previous chain.
+        self.assertEqual(self.tree.next_element, None)
+
+    def test_find_all_next(self):
+        self.assertSelects(self.start.find_all_next('b'), ["Two", "Three"])
+        self.start.find_all_next(id=3)
+        self.assertSelects(self.start.find_all_next(id=3), ["Three"])
+
+    def test_find_next(self):
+        self.assertEqual(self.start.find_next('b')['id'], '2')
+        self.assertEqual(self.start.find_next(text="Three"), "Three")
+
+    def test_find_next_for_text_element(self):
+        text = self.tree.find(text="One")
+        self.assertEqual(text.find_next("b").string, "Two")
+        self.assertSelects(text.find_all_next("b"), ["Two", "Three"])
+
+    def test_next_generator(self):
+        start = self.tree.find(text="Two")
+        successors = [node for node in start.next_elements]
+        # There are two successors: the final  tag and its text contents.
+        tag, contents = successors
+        self.assertEqual(tag['id'], '3')
+        self.assertEqual(contents, "Three")
+
+class TestPreviousOperations(ProximityTest):
+
+    def setUp(self):
+        super(TestPreviousOperations, self).setUp()
+        self.end = self.tree.find(text="Three")
+
+    def test_previous(self):
+        self.assertEqual(self.end.previous_element['id'], "3")
+        self.assertEqual(self.end.previous_element.previous_element, "Two")
+
+    def test_previous_of_first_item_is_none(self):
+        first = self.tree.find('html')
+        self.assertEqual(first.previous_element, None)
+
+    def test_previous_of_root_is_none(self):
+        # The document root is outside the next/previous chain.
+        # XXX This is broken!
+        #self.assertEqual(self.tree.previous_element, None)
+        pass
+
+    def test_find_all_previous(self):
+        # The  tag containing the "Three" node is the predecessor
+        # of the "Three" node itself, which is why "Three" shows up
+        # here.
+        self.assertSelects(
+            self.end.find_all_previous('b'), ["Three", "Two", "One"])
+        self.assertSelects(self.end.find_all_previous(id=1), ["One"])
+
+    def test_find_previous(self):
+        self.assertEqual(self.end.find_previous('b')['id'], '3')
+        self.assertEqual(self.end.find_previous(text="One"), "One")
+
+    def test_find_previous_for_text_element(self):
+        text = self.tree.find(text="Three")
+        self.assertEqual(text.find_previous("b").string, "Three")
+        self.assertSelects(
+            text.find_all_previous("b"), ["Three", "Two", "One"])
+
+    def test_previous_generator(self):
+        start = self.tree.find(text="One")
+        predecessors = [node for node in start.previous_elements]
+
+        # There are four predecessors: the  tag containing "One"
+        # the  tag, the  tag, and the  tag.
+        b, body, head, html = predecessors
+        self.assertEqual(b['id'], '1')
+        self.assertEqual(body.name, "body")
+        self.assertEqual(head.name, "head")
+        self.assertEqual(html.name, "html")
+
+
+class SiblingTest(TreeTest):
+
+    def setUp(self):
+        super(SiblingTest, self).setUp()
+        markup = '''
+                    
+                     
+                    
+                    
+                     
+                    
+                    
+                     
+                    
+                    
+                    '''
+        # All that whitespace looks good but makes the tests more
+        # difficult. Get rid of it.
+        markup = re.compile("\n\s*").sub("", markup)
+        self.tree = self.soup(markup)
+
+
+class TestNextSibling(SiblingTest):
+
+    def setUp(self):
+        super(TestNextSibling, self).setUp()
+        self.start = self.tree.find(id="1")
+
+    def test_next_sibling_of_root_is_none(self):
+        self.assertEqual(self.tree.next_sibling, None)
+
+    def test_next_sibling(self):
+        self.assertEqual(self.start.next_sibling['id'], '2')
+        self.assertEqual(self.start.next_sibling.next_sibling['id'], '3')
+
+        # Note the difference between next_sibling and next_element.
+        self.assertEqual(self.start.next_element['id'], '1.1')
+
+    def test_next_sibling_may_not_exist(self):
+        self.assertEqual(self.tree.html.next_sibling, None)
+
+        nested_span = self.tree.find(id="1.1")
+        self.assertEqual(nested_span.next_sibling, None)
+
+        last_span = self.tree.find(id="4")
+        self.assertEqual(last_span.next_sibling, None)
+
+    def test_find_next_sibling(self):
+        self.assertEqual(self.start.find_next_sibling('span')['id'], '2')
+
+    def test_next_siblings(self):
+        self.assertSelectsIDs(self.start.find_next_siblings("span"),
+                              ['2', '3', '4'])
+
+        self.assertSelectsIDs(self.start.find_next_siblings(id='3'), ['3'])
+
+    def test_next_sibling_for_text_element(self):
+        soup = self.soup("Foobarbaz")
+        start = soup.find(text="Foo")
+        self.assertEqual(start.next_sibling.name, 'b')
+        self.assertEqual(start.next_sibling.next_sibling, 'baz')
+
+        self.assertSelects(start.find_next_siblings('b'), ['bar'])
+        self.assertEqual(start.find_next_sibling(text="baz"), "baz")
+        self.assertEqual(start.find_next_sibling(text="nonesuch"), None)
+
+
+class TestPreviousSibling(SiblingTest):
+
+    def setUp(self):
+        super(TestPreviousSibling, self).setUp()
+        self.end = self.tree.find(id="4")
+
+    def test_previous_sibling_of_root_is_none(self):
+        self.assertEqual(self.tree.previous_sibling, None)
+
+    def test_previous_sibling(self):
+        self.assertEqual(self.end.previous_sibling['id'], '3')
+        self.assertEqual(self.end.previous_sibling.previous_sibling['id'], '2')
+
+        # Note the difference between previous_sibling and previous_element.
+        self.assertEqual(self.end.previous_element['id'], '3.1')
+
+    def test_previous_sibling_may_not_exist(self):
+        self.assertEqual(self.tree.html.previous_sibling, None)
+
+        nested_span = self.tree.find(id="1.1")
+        self.assertEqual(nested_span.previous_sibling, None)
+
+        first_span = self.tree.find(id="1")
+        self.assertEqual(first_span.previous_sibling, None)
+
+    def test_find_previous_sibling(self):
+        self.assertEqual(self.end.find_previous_sibling('span')['id'], '3')
+
+    def test_previous_siblings(self):
+        self.assertSelectsIDs(self.end.find_previous_siblings("span"),
+                              ['3', '2', '1'])
+
+        self.assertSelectsIDs(self.end.find_previous_siblings(id='1'), ['1'])
+
+    def test_previous_sibling_for_text_element(self):
+        soup = self.soup("Foobarbaz")
+        start = soup.find(text="baz")
+        self.assertEqual(start.previous_sibling.name, 'b')
+        self.assertEqual(start.previous_sibling.previous_sibling, 'Foo')
+
+        self.assertSelects(start.find_previous_siblings('b'), ['bar'])
+        self.assertEqual(start.find_previous_sibling(text="Foo"), "Foo")
+        self.assertEqual(start.find_previous_sibling(text="nonesuch"), None)
+
+
+class TestTagCreation(SoupTest):
+    """Test the ability to create new tags."""
+    def test_new_tag(self):
+        soup = self.soup("")
+        new_tag = soup.new_tag("foo", bar="baz")
+        self.assertTrue(isinstance(new_tag, Tag))
+        self.assertEqual("foo", new_tag.name)
+        self.assertEqual(dict(bar="baz"), new_tag.attrs)
+        self.assertEqual(None, new_tag.parent)
+
+    def test_tag_inherits_self_closing_rules_from_builder(self):
+        if XML_BUILDER_PRESENT:
+            xml_soup = BeautifulSoup("", "xml")
+            xml_br = xml_soup.new_tag("br")
+            xml_p = xml_soup.new_tag("p")
+
+            # Both the 
       and 
       tag are empty-element, just because
+            # they have no contents.
+            self.assertEqual(b"
      ", xml_br.encode())
+            self.assertEqual(b"
      ", xml_p.encode())
+
+        html_soup = BeautifulSoup("", "html")
+        html_br = html_soup.new_tag("br")
+        html_p = html_soup.new_tag("p")
+
+        # The HTML builder users HTML's rules about which tags are
+        # empty-element tags, and the new tags reflect these rules.
+        self.assertEqual(b"
      ", html_br.encode())
+        self.assertEqual(b"
      ", html_p.encode())
+
+    def test_new_string_creates_navigablestring(self):
+        soup = self.soup("")
+        s = soup.new_string("foo")
+        self.assertEqual("foo", s)
+        self.assertTrue(isinstance(s, NavigableString))
+
+class TestTreeModification(SoupTest):
+
+    def test_attribute_modification(self):
+        soup = self.soup('')
+        soup.a['id'] = 2
+        self.assertEqual(soup.decode(), self.document_for(''))
+        del(soup.a['id'])
+        self.assertEqual(soup.decode(), self.document_for(''))
+        soup.a['id2'] = 'foo'
+        self.assertEqual(soup.decode(), self.document_for(''))
+
+    def test_new_tag_creation(self):
+        builder = builder_registry.lookup('html')()
+        soup = self.soup("", builder=builder)
+        a = Tag(soup, builder, 'a')
+        ol = Tag(soup, builder, 'ol')
+        a['href'] = 'http://foo.com/'
+        soup.body.insert(0, a)
+        soup.body.insert(1, ol)
+        self.assertEqual(
+            soup.body.encode(),
+            b'
        ')
+
+    def test_append_to_contents_moves_tag(self):
+        doc = """
        Don't leave me here.
        
+                
        Don\'t leave!
        """
+        soup = self.soup(doc)
+        second_para = soup.find(id='2')
+        bold = soup.b
+
+        # Move the  tag to the end of the second paragraph.
+        soup.find(id='2').append(soup.b)
+
+        # The  tag is now a child of the second paragraph.
+        self.assertEqual(bold.parent, second_para)
+
+        self.assertEqual(
+            soup.decode(), self.document_for(
+                '
        Don\'t leave me .
        \n'
+                '
        Don\'t leave!here
        '))
+
+    def test_replace_with_returns_thing_that_was_replaced(self):
+        text = ""
+        soup = self.soup(text)
+        a = soup.a
+        new_a = a.replace_with(soup.c)
+        self.assertEqual(a, new_a)
+
+    def test_unwrap_returns_thing_that_was_replaced(self):
+        text = ""
+        soup = self.soup(text)
+        a = soup.a
+        new_a = a.unwrap()
+        self.assertEqual(a, new_a)
+
+    def test_replace_tag_with_itself(self):
+        text = "Foo"
+        soup = self.soup(text)
+        c = soup.c
+        soup.c.replace_with(c)
+        self.assertEqual(soup.decode(), self.document_for(text))
+
+    def test_replace_tag_with_its_parent_raises_exception(self):
+        text = ""
+        soup = self.soup(text)
+        self.assertRaises(ValueError, soup.b.replace_with, soup.a)
+
+    def test_insert_tag_into_itself_raises_exception(self):
+        text = ""
+        soup = self.soup(text)
+        self.assertRaises(ValueError, soup.a.insert, 0, soup.a)
+
+    def test_replace_with_maintains_next_element_throughout(self):
+        soup = self.soup('
        onethree
        ')
+        a = soup.a
+        b = a.contents[0]
+        # Make it so the  tag has two text children.
+        a.insert(1, "two")
+
+        # Now replace each one with the empty string.
+        left, right = a.contents
+        left.replaceWith('')
+        right.replaceWith('')
+
+        # The  tag is still connected to the tree.
+        self.assertEqual("three", soup.b.string)
+
+    def test_replace_final_node(self):
+        soup = self.soup("Argh!")
+        soup.find(text="Argh!").replace_with("Hooray!")
+        new_text = soup.find(text="Hooray!")
+        b = soup.b
+        self.assertEqual(new_text.previous_element, b)
+        self.assertEqual(new_text.parent, b)
+        self.assertEqual(new_text.previous_element.next_element, new_text)
+        self.assertEqual(new_text.next_element, None)
+
+    def test_consecutive_text_nodes(self):
+        # A builder should never create two consecutive text nodes,
+        # but if you insert one next to another, Beautiful Soup will
+        # handle it correctly.
+        soup = self.soup("Argh!")
+        soup.b.insert(1, "Hooray!")
+
+        self.assertEqual(
+            soup.decode(), self.document_for(
+                "Argh!Hooray!"))
+
+        new_text = soup.find(text="Hooray!")
+        self.assertEqual(new_text.previous_element, "Argh!")
+        self.assertEqual(new_text.previous_element.next_element, new_text)
+
+        self.assertEqual(new_text.previous_sibling, "Argh!")
+        self.assertEqual(new_text.previous_sibling.next_sibling, new_text)
+
+        self.assertEqual(new_text.next_sibling, None)
+        self.assertEqual(new_text.next_element, soup.c)
+
+    def test_insert_string(self):
+        soup = self.soup("")
+        soup.a.insert(0, "bar")
+        soup.a.insert(0, "foo")
+        # The string were added to the tag.
+        self.assertEqual(["foo", "bar"], soup.a.contents)
+        # And they were converted to NavigableStrings.
+        self.assertEqual(soup.a.contents[0].next_element, "bar")
+
+    def test_insert_tag(self):
+        builder = self.default_builder
+        soup = self.soup(
+            "Findlady!", builder=builder)
+        magic_tag = Tag(soup, builder, 'magictag')
+        magic_tag.insert(0, "the")
+        soup.a.insert(1, magic_tag)
+
+        self.assertEqual(
+            soup.decode(), self.document_for(
+                "Findthelady!"))
+
+        # Make sure all the relationships are hooked up correctly.
+        b_tag = soup.b
+        self.assertEqual(b_tag.next_sibling, magic_tag)
+        self.assertEqual(magic_tag.previous_sibling, b_tag)
+
+        find = b_tag.find(text="Find")
+        self.assertEqual(find.next_element, magic_tag)
+        self.assertEqual(magic_tag.previous_element, find)
+
+        c_tag = soup.c
+        self.assertEqual(magic_tag.next_sibling, c_tag)
+        self.assertEqual(c_tag.previous_sibling, magic_tag)
+
+        the = magic_tag.find(text="the")
+        self.assertEqual(the.parent, magic_tag)
+        self.assertEqual(the.next_element, c_tag)
+        self.assertEqual(c_tag.previous_element, the)
+
+    def test_append_child_thats_already_at_the_end(self):
+        data = ""
+        soup = self.soup(data)
+        soup.a.append(soup.b)
+        self.assertEqual(data, soup.decode())
+
+    def test_move_tag_to_beginning_of_parent(self):
+        data = ""
+        soup = self.soup(data)
+        soup.a.insert(0, soup.d)
+        self.assertEqual("", soup.decode())
+
+    def test_insert_works_on_empty_element_tag(self):
+        # This is a little strange, since most HTML parsers don't allow
+        # markup like this to come through. But in general, we don't
+        # know what the parser would or wouldn't have allowed, so
+        # I'm letting this succeed for now.
+        soup = self.soup("
        ")
+        soup.br.insert(1, "Contents")
+        self.assertEqual(str(soup.br), "
        Contents
        ")
+
+    def test_insert_before(self):
+        soup = self.soup("foobar")
+        soup.b.insert_before("BAZ")
+        soup.a.insert_before("QUUX")
+        self.assertEqual(
+            soup.decode(), self.document_for("QUUXfooBAZbar"))
+
+        soup.a.insert_before(soup.b)
+        self.assertEqual(
+            soup.decode(), self.document_for("QUUXbarfooBAZ"))
+
+    def test_insert_after(self):
+        soup = self.soup("foobar")
+        soup.b.insert_after("BAZ")
+        soup.a.insert_after("QUUX")
+        self.assertEqual(
+            soup.decode(), self.document_for("fooQUUXbarBAZ"))
+        soup.b.insert_after(soup.a)
+        self.assertEqual(
+            soup.decode(), self.document_for("QUUXbarfooBAZ"))
+
+    def test_insert_after_raises_exception_if_after_has_no_meaning(self):
+        soup = self.soup("")
+        tag = soup.new_tag("a")
+        string = soup.new_string("")
+        self.assertRaises(ValueError, string.insert_after, tag)
+        self.assertRaises(NotImplementedError, soup.insert_after, tag)
+        self.assertRaises(ValueError, tag.insert_after, tag)
+
+    def test_insert_before_raises_notimplementederror_if_before_has_no_meaning(self):
+        soup = self.soup("")
+        tag = soup.new_tag("a")
+        string = soup.new_string("")
+        self.assertRaises(ValueError, string.insert_before, tag)
+        self.assertRaises(NotImplementedError, soup.insert_before, tag)
+        self.assertRaises(ValueError, tag.insert_before, tag)
+
+    def test_replace_with(self):
+        soup = self.soup(
+                "
        There's no business like show business
        ")
+        no, show = soup.find_all('b')
+        show.replace_with(no)
+        self.assertEqual(
+            soup.decode(),
+            self.document_for(
+                "
        There's  business like no business
        "))
+
+        self.assertEqual(show.parent, None)
+        self.assertEqual(no.parent, soup.p)
+        self.assertEqual(no.next_element, "no")
+        self.assertEqual(no.next_sibling, " business")
+
+    def test_replace_first_child(self):
+        data = ""
+        soup = self.soup(data)
+        soup.b.replace_with(soup.c)
+        self.assertEqual("", soup.decode())
+
+    def test_replace_last_child(self):
+        data = ""
+        soup = self.soup(data)
+        soup.c.replace_with(soup.b)
+        self.assertEqual("", soup.decode())
+
+    def test_nested_tag_replace_with(self):
+        soup = self.soup(
+            """Wereservetherighttorefuseservice""")
+
+        # Replace the entire  tag and its contents ("reserve the
+        # right") with the  tag ("refuse").
+        remove_tag = soup.b
+        move_tag = soup.f
+        remove_tag.replace_with(move_tag)
+
+        self.assertEqual(
+            soup.decode(), self.document_for(
+                "Werefusetoservice"))
+
+        # The  tag is now an orphan.
+        self.assertEqual(remove_tag.parent, None)
+        self.assertEqual(remove_tag.find(text="right").next_element, None)
+        self.assertEqual(remove_tag.previous_element, None)
+        self.assertEqual(remove_tag.next_sibling, None)
+        self.assertEqual(remove_tag.previous_sibling, None)
+
+        # The  tag is now connected to the  tag.
+        self.assertEqual(move_tag.parent, soup.a)
+        self.assertEqual(move_tag.previous_element, "We")
+        self.assertEqual(move_tag.next_element.next_element, soup.e)
+        self.assertEqual(move_tag.next_sibling, None)
+
+        # The gap where the  tag used to be has been mended, and
+        # the word "to" is now connected to the  tag.
+        to_text = soup.find(text="to")
+        g_tag = soup.g
+        self.assertEqual(to_text.next_element, g_tag)
+        self.assertEqual(to_text.next_sibling, g_tag)
+        self.assertEqual(g_tag.previous_element, to_text)
+        self.assertEqual(g_tag.previous_sibling, to_text)
+
+    def test_unwrap(self):
+        tree = self.soup("""
+            
        Unneeded formatting is unneeded
        
+            """)
+        tree.em.unwrap()
+        self.assertEqual(tree.em, None)
+        self.assertEqual(tree.p.text, "Unneeded formatting is unneeded")
+
+    def test_wrap(self):
+        soup = self.soup("I wish I was bold.")
+        value = soup.string.wrap(soup.new_tag("b"))
+        self.assertEqual(value.decode(), "I wish I was bold.")
+        self.assertEqual(
+            soup.decode(), self.document_for("I wish I was bold."))
+
+    def test_wrap_extracts_tag_from_elsewhere(self):
+        soup = self.soup("I wish I was bold.")
+        soup.b.next_sibling.wrap(soup.b)
+        self.assertEqual(
+            soup.decode(), self.document_for("I wish I was bold."))
+
+    def test_wrap_puts_new_contents_at_the_end(self):
+        soup = self.soup("I like being bold.I wish I was bold.")
+        soup.b.next_sibling.wrap(soup.b)
+        self.assertEqual(2, len(soup.b.contents))
+        self.assertEqual(
+            soup.decode(), self.document_for(
+                "I like being bold.I wish I was bold."))
+
+    def test_extract(self):
+        soup = self.soup(
+            'Some content.  More content.')
+
+        self.assertEqual(len(soup.body.contents), 3)
+        extracted = soup.find(id="nav").extract()
+
+        self.assertEqual(
+            soup.decode(), "Some content.  More content.")
+        self.assertEqual(extracted.decode(), '')
+
+        # The extracted tag is now an orphan.
+        self.assertEqual(len(soup.body.contents), 2)
+        self.assertEqual(extracted.parent, None)
+        self.assertEqual(extracted.previous_element, None)
+        self.assertEqual(extracted.next_element.next_element, None)
+
+        # The gap where the extracted tag used to be has been mended.
+        content_1 = soup.find(text="Some content. ")
+        content_2 = soup.find(text=" More content.")
+        self.assertEqual(content_1.next_element, content_2)
+        self.assertEqual(content_1.next_sibling, content_2)
+        self.assertEqual(content_2.previous_element, content_1)
+        self.assertEqual(content_2.previous_sibling, content_1)
+
+    def test_extract_distinguishes_between_identical_strings(self):
+        soup = self.soup("        foobar")
+        foo_1 = soup.a.string
+        bar_1 = soup.b.string
+        foo_2 = soup.new_string("foo")
+        bar_2 = soup.new_string("bar")
+        soup.a.append(foo_2)
+        soup.b.append(bar_2)
+
+        # Now there are two identical strings in the  tag, and two
+        # in the  tag. Let's remove the first "foo" and the second
+        # "bar".
+        foo_1.extract()
+        bar_2.extract()
+        self.assertEqual(foo_2, soup.a.string)
+        self.assertEqual(bar_2, soup.b.string)
+
+    def test_clear(self):
+        """Tag.clear()"""
+        soup = self.soup("
        String Italicized and another
        ")
+        # clear using extract()
+        a = soup.a
+        soup.p.clear()
+        self.assertEqual(len(soup.p.contents), 0)
+        self.assertTrue(hasattr(a, "contents"))
+
+        # clear using decompose()
+        em = a.em
+        a.clear(decompose=True)
+        self.assertFalse(hasattr(em, "contents"))
+
+    def test_string_set(self):
+        """Tag.string = 'string'"""
+        soup = self.soup(" ")
+        soup.a.string = "foo"
+        self.assertEqual(soup.a.contents, ["foo"])
+        soup.b.string = "bar"
+        self.assertEqual(soup.b.contents, ["bar"])
+
+    def test_string_set_does_not_affect_original_string(self):
+        soup = self.soup("foobar")
+        soup.b.string = soup.c.string
+        self.assertEqual(soup.a.encode(), b"barbar")
+
+    def test_set_string_preserves_class_of_string(self):
+        soup = self.soup("")
+        cdata = CData("foo")
+        soup.a.string = cdata
+        self.assertTrue(isinstance(soup.a.string, CData))
+
+class TestElementObjects(SoupTest):
+    """Test various features of element objects."""
+
+    def test_len(self):
+        """The length of an element is its number of children."""
+        soup = self.soup("123")
+
+        # The BeautifulSoup object itself contains one element: the
+        #  tag.
+        self.assertEqual(len(soup.contents), 1)
+        self.assertEqual(len(soup), 1)
+
+        # The  tag contains three elements: the text node "1", the
+        #  tag, and the text node "3".
+        self.assertEqual(len(soup.top), 3)
+        self.assertEqual(len(soup.top.contents), 3)
+
+    def test_member_access_invokes_find(self):
+        """Accessing a Python member .foo invokes find('foo')"""
+        soup = self.soup('')
+        self.assertEqual(soup.b, soup.find('b'))
+        self.assertEqual(soup.b.i, soup.find('b').find('i'))
+        self.assertEqual(soup.a, None)
+
+    def test_deprecated_member_access(self):
+        soup = self.soup('')
+        with warnings.catch_warnings(record=True) as w:
+            tag = soup.bTag
+        self.assertEqual(soup.b, tag)
+        self.assertEqual(
+            '.bTag is deprecated, use .find("b") instead.',
+            str(w[0].message))
+
+    def test_has_attr(self):
+        """has_attr() checks for the presence of an attribute.
+
+        Please note note: has_attr() is different from
+        __in__. has_attr() checks the tag's attributes and __in__
+        checks the tag's chidlren.
+        """
+        soup = self.soup("")
+        self.assertTrue(soup.foo.has_attr('attr'))
+        self.assertFalse(soup.foo.has_attr('attr2'))
+
+
+    def test_attributes_come_out_in_alphabetical_order(self):
+        markup = ''
+        self.assertSoupEquals(markup, '')
+
+    def test_string(self):
+        # A tag that contains only a text node makes that node
+        # available as .string.
+        soup = self.soup("foo")
+        self.assertEqual(soup.b.string, 'foo')
+
+    def test_empty_tag_has_no_string(self):
+        # A tag with no children has no .stirng.
+        soup = self.soup("")
+        self.assertEqual(soup.b.string, None)
+
+    def test_tag_with_multiple_children_has_no_string(self):
+        # A tag with no children has no .string.
+        soup = self.soup("foo")
+        self.assertEqual(soup.b.string, None)
+
+        soup = self.soup("foobar        ")
+        self.assertEqual(soup.b.string, None)
+
+        # Even if all the children are strings, due to trickery,
+        # it won't work--but this would be a good optimization.
+        soup = self.soup("foo        ")
+        soup.a.insert(1, "bar")
+        self.assertEqual(soup.a.string, None)
+
+    def test_tag_with_recursive_string_has_string(self):
+        # A tag with a single child which has a .string inherits that
+        # .string.
+        soup = self.soup("foo")
+        self.assertEqual(soup.a.string, "foo")
+        self.assertEqual(soup.string, "foo")
+
+    def test_lack_of_string(self):
+        """Only a tag containing a single text node has a .string."""
+        soup = self.soup("feo")
+        self.assertFalse(soup.b.string)
+
+        soup = self.soup("")
+        self.assertFalse(soup.b.string)
+
+    def test_all_text(self):
+        """Tag.text and Tag.get_text(sep=u"") -> all child text, concatenated"""
+        soup = self.soup("ar    t ")
+        self.assertEqual(soup.a.text, "ar  t ")
+        self.assertEqual(soup.a.get_text(strip=True), "art")
+        self.assertEqual(soup.a.get_text(","), "a,r, , t ")
+        self.assertEqual(soup.a.get_text(",", strip=True), "a,r,t")
+
+class TestCDAtaListAttributes(SoupTest):
+
+    """Testing cdata-list attributes like 'class'.
+    """
+    def test_single_value_becomes_list(self):
+        soup = self.soup("")
+        self.assertEqual(["foo"],soup.a['class'])
+
+    def test_multiple_values_becomes_list(self):
+        soup = self.soup("")
+        self.assertEqual(["foo", "bar"], soup.a['class'])
+
+    def test_multiple_values_separated_by_weird_whitespace(self):
+        soup = self.soup("")
+        self.assertEqual(["foo", "bar", "baz"],soup.a['class'])
+
+    def test_attributes_joined_into_string_on_output(self):
+        soup = self.soup("")
+        self.assertEqual(b'', soup.a.encode())
+
+    def test_accept_charset(self):
+        soup = self.soup('
        ')
+        self.assertEqual(['ISO-8859-1', 'UTF-8'], soup.form['accept-charset'])
+
+    def test_cdata_attribute_applying_only_to_one_tag(self):
+        data = ''
+        soup = self.soup(data)
+        # We saw in another test that accept-charset is a cdata-list
+        # attribute for the  tag. But it's not a cdata-list
+        # attribute for any other tag.
+        self.assertEqual('ISO-8859-1 UTF-8', soup.a['accept-charset'])
+
+
+class TestPersistence(SoupTest):
+    "Testing features like pickle and deepcopy."
+
+    def setUp(self):
+        super(TestPersistence, self).setUp()
+        self.page = """
+
+
+
+Beautiful Soup: We called him Tortoise because he taught us.
+
+
+
+
+
+
+foo
+bar
+
+"""
+        self.tree = self.soup(self.page)
+
+    def test_pickle_and_unpickle_identity(self):
+        # Pickling a tree, then unpickling it, yields a tree identical
+        # to the original.
+        dumped = pickle.dumps(self.tree, 2)
+        loaded = pickle.loads(dumped)
+        self.assertEqual(loaded.__class__, BeautifulSoup)
+        self.assertEqual(loaded.decode(), self.tree.decode())
+
+    def test_deepcopy_identity(self):
+        # Making a deepcopy of a tree yields an identical tree.
+        copied = copy.deepcopy(self.tree)
+        self.assertEqual(copied.decode(), self.tree.decode())
+
+    def test_unicode_pickle(self):
+        # A tree containing Unicode characters can be pickled.
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        dumped = pickle.dumps(soup, pickle.HIGHEST_PROTOCOL)
+        loaded = pickle.loads(dumped)
+        self.assertEqual(loaded.decode(), soup.decode())
+
+
+class TestSubstitutions(SoupTest):
+
+    def test_default_formatter_is_minimal(self):
+        markup = u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"
+        soup = self.soup(markup)
+        decoded = soup.decode(formatter="minimal")
+        # The < is converted back into < but the e-with-acute is left alone.
+        self.assertEqual(
+            decoded,
+            self.document_for(
+                u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"))
+
+    def test_formatter_html(self):
+        markup = u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"
+        soup = self.soup(markup)
+        decoded = soup.decode(formatter="html")
+        self.assertEqual(
+            decoded,
+            self.document_for("<<Sacré bleu!>>"))
+
+    def test_formatter_minimal(self):
+        markup = u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"
+        soup = self.soup(markup)
+        decoded = soup.decode(formatter="minimal")
+        # The < is converted back into < but the e-with-acute is left alone.
+        self.assertEqual(
+            decoded,
+            self.document_for(
+                u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"))
+
+    def test_formatter_null(self):
+        markup = u"<<Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!>>"
+        soup = self.soup(markup)
+        decoded = soup.decode(formatter=None)
+        # Neither the angle brackets nor the e-with-acute are converted.
+        # This is not valid HTML, but it's what the user wanted.
+        self.assertEqual(decoded,
+                          self.document_for(u"<>"))
+
+    def test_formatter_custom(self):
+        markup = u"<foo>bar"
+        soup = self.soup(markup)
+        decoded = soup.decode(formatter = lambda x: x.upper())
+        # Instead of normal entity conversion code, the custom
+        # callable is called on every string.
+        self.assertEqual(
+            decoded,
+            self.document_for(u"BAR"))
+
+    def test_formatter_is_run_on_attribute_values(self):
+        markup = u'e'
+        soup = self.soup(markup)
+        a = soup.a
+
+        expect_minimal = u'e'
+
+        self.assertEqual(expect_minimal, a.decode())
+        self.assertEqual(expect_minimal, a.decode(formatter="minimal"))
+
+        expect_html = u'e'
+        self.assertEqual(expect_html, a.decode(formatter="html"))
+
+        self.assertEqual(markup, a.decode(formatter=None))
+        expect_upper = u'E'
+        self.assertEqual(expect_upper, a.decode(formatter=lambda x: x.upper()))
+
+    def test_prettify_accepts_formatter(self):
+        soup = BeautifulSoup("foo")
+        pretty = soup.prettify(formatter = lambda x: x.upper())
+        self.assertTrue("FOO" in pretty)
+
+    def test_prettify_outputs_unicode_by_default(self):
+        soup = self.soup("")
+        self.assertEqual(unicode, type(soup.prettify()))
+
+    def test_prettify_can_encode_data(self):
+        soup = self.soup("")
+        self.assertEqual(bytes, type(soup.prettify("utf-8")))
+
+    def test_html_entity_substitution_off_by_default(self):
+        markup = u"Sacr\N{LATIN SMALL LETTER E WITH ACUTE} bleu!"
+        soup = self.soup(markup)
+        encoded = soup.b.encode("utf-8")
+        self.assertEqual(encoded, markup.encode('utf-8'))
+
+    def test_encoding_substitution(self):
+        # Here's the  tag saying that a document is
+        # encoded in Shift-JIS.
+        meta_tag = ('')
+        soup = self.soup(meta_tag)
+
+        # Parse the document, and the charset apprears unchanged.
+        self.assertEqual(soup.meta['content'], 'text/html; charset=x-sjis')
+
+        # Encode the document into some encoding, and the encoding is
+        # substituted into the meta tag.
+        utf_8 = soup.encode("utf-8")
+        self.assertTrue(b"charset=utf-8" in utf_8)
+
+        euc_jp = soup.encode("euc_jp")
+        self.assertTrue(b"charset=euc_jp" in euc_jp)
+
+        shift_jis = soup.encode("shift-jis")
+        self.assertTrue(b"charset=shift-jis" in shift_jis)
+
+        utf_16_u = soup.encode("utf-16").decode("utf-16")
+        self.assertTrue("charset=utf-16" in utf_16_u)
+
+    def test_encoding_substitution_doesnt_happen_if_tag_is_strained(self):
+        markup = ('
        foo
        ')
+
+        # Beautiful Soup used to try to rewrite the meta tag even if the
+        # meta tag got filtered out by the strainer. This test makes
+        # sure that doesn't happen.
+        strainer = SoupStrainer('pre')
+        soup = self.soup(markup, parse_only=strainer)
+        self.assertEqual(soup.contents[0].name, 'pre')
+
+class TestEncoding(SoupTest):
+    """Test the ability to encode objects into strings."""
+
+    def test_unicode_string_can_be_encoded(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(soup.b.string.encode("utf-8"),
+                          u"\N{SNOWMAN}".encode("utf-8"))
+
+    def test_tag_containing_unicode_string_can_be_encoded(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(
+            soup.b.encode("utf-8"), html.encode("utf-8"))
+
+    def test_encoding_substitutes_unrecognized_characters_by_default(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(soup.b.encode("ascii"), b"☃")
+
+    def test_encoding_can_be_made_strict(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertRaises(
+            UnicodeEncodeError, soup.encode, "ascii", errors="strict")
+
+    def test_decode_contents(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(u"\N{SNOWMAN}", soup.b.decode_contents())
+
+    def test_encode_contents(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(
+            u"\N{SNOWMAN}".encode("utf8"), soup.b.encode_contents(
+                encoding="utf8"))
+
+    def test_deprecated_renderContents(self):
+        html = u"\N{SNOWMAN}"
+        soup = self.soup(html)
+        self.assertEqual(
+            u"\N{SNOWMAN}".encode("utf8"), soup.b.renderContents())
+
+class TestNavigableStringSubclasses(SoupTest):
+
+    def test_cdata(self):
+        # None of the current builders turn CDATA sections into CData
+        # objects, but you can create them manually.
+        soup = self.soup("")
+        cdata = CData("foo")
+        soup.insert(1, cdata)
+        self.assertEqual(str(soup), "")
+        self.assertEqual(soup.find(text="foo"), "foo")
+        self.assertEqual(soup.contents[0], "foo")
+
+    def test_cdata_is_never_formatted(self):
+        """Text inside a CData object is passed into the formatter.
+
+        But the return value is ignored.
+        """
+
+        self.count = 0
+        def increment(*args):
+            self.count += 1
+            return "BITTER FAILURE"
+
+        soup = self.soup("")
+        cdata = CData("<><><>")
+        soup.insert(1, cdata)
+        self.assertEqual(
+            b"<><>]]>", soup.encode(formatter=increment))
+        self.assertEqual(1, self.count)
+
+    def test_doctype_ends_in_newline(self):
+        # Unlike other NavigableString subclasses, a DOCTYPE always ends
+        # in a newline.
+        doctype = Doctype("foo")
+        soup = self.soup("")
+        soup.insert(1, doctype)
+        self.assertEqual(soup.encode(), b"\n")
+
+
+class TestSoupSelector(TreeTest):
+
+    HTML = """
+
+
+
+The title
+
+
+
+
+
        
+
        
+
        An H1
        
+
        Some text
        
+
        Some more text
        
+
        An H2
        
+
        Another
        
+Bob
+
        Another H2
        
+me
+
+span1a1
+span1a2 test
+
+span2a1
+
+
+
+
        
+
        English
        
+
        English UK
        
+
        English US
        
+
        French
        
+
        
+
+
+"""
+
+    def setUp(self):
+        self.soup = BeautifulSoup(self.HTML)
+
+    def assertSelects(self, selector, expected_ids):
+        el_ids = [el['id'] for el in self.soup.select(selector)]
+        el_ids.sort()
+        expected_ids.sort()
+        self.assertEqual(expected_ids, el_ids,
+            "Selector %s, expected [%s], got [%s]" % (
+                selector, ', '.join(expected_ids), ', '.join(el_ids)
+            )
+        )
+
+    assertSelect = assertSelects
+
+    def assertSelectMultiple(self, *tests):
+        for selector, expected_ids in tests:
+            self.assertSelect(selector, expected_ids)
+
+    def test_one_tag_one(self):
+        els = self.soup.select('title')
+        self.assertEqual(len(els), 1)
+        self.assertEqual(els[0].name, 'title')
+        self.assertEqual(els[0].contents, [u'The title'])
+
+    def test_one_tag_many(self):
+        els = self.soup.select('div')
+        self.assertEqual(len(els), 3)
+        for div in els:
+            self.assertEqual(div.name, 'div')
+
+    def test_tag_in_tag_one(self):
+        els = self.soup.select('div div')
+        self.assertSelects('div div', ['inner'])
+
+    def test_tag_in_tag_many(self):
+        for selector in ('html div', 'html body div', 'body div'):
+            self.assertSelects(selector, ['main', 'inner', 'footer'])
+
+    def test_tag_no_match(self):
+        self.assertEqual(len(self.soup.select('del')), 0)
+
+    def test_invalid_tag(self):
+        self.assertEqual(len(self.soup.select('tag%t')), 0)
+
+    def test_header_tags(self):
+        self.assertSelectMultiple(
+            ('h1', ['header1']),
+            ('h2', ['header2', 'header3']),
+        )
+
+    def test_class_one(self):
+        for selector in ('.onep', 'p.onep', 'html p.onep'):
+            els = self.soup.select(selector)
+            self.assertEqual(len(els), 1)
+            self.assertEqual(els[0].name, 'p')
+            self.assertEqual(els[0]['class'], ['onep'])
+
+    def test_class_mismatched_tag(self):
+        els = self.soup.select('div.onep')
+        self.assertEqual(len(els), 0)
+
+    def test_one_id(self):
+        for selector in ('div#inner', '#inner', 'div div#inner'):
+            self.assertSelects(selector, ['inner'])
+
+    def test_bad_id(self):
+        els = self.soup.select('#doesnotexist')
+        self.assertEqual(len(els), 0)
+
+    def test_items_in_id(self):
+        els = self.soup.select('div#inner p')
+        self.assertEqual(len(els), 3)
+        for el in els:
+            self.assertEqual(el.name, 'p')
+        self.assertEqual(els[1]['class'], ['onep'])
+        self.assertFalse(els[0].has_key('class'))
+
+    def test_a_bunch_of_emptys(self):
+        for selector in ('div#main del', 'div#main div.oops', 'div div#main'):
+            self.assertEqual(len(self.soup.select(selector)), 0)
+
+    def test_multi_class_support(self):
+        for selector in ('.class1', 'p.class1', '.class2', 'p.class2',
+            '.class3', 'p.class3', 'html p.class2', 'div#inner .class2'):
+            self.assertSelects(selector, ['pmulti'])
+
+    def test_multi_class_selection(self):
+        for selector in ('.class1.class3', '.class3.class2',
+                         '.class1.class2.class3'):
+            self.assertSelects(selector, ['pmulti'])
+
+    def test_child_selector(self):
+        self.assertSelects('.s1 > a', ['s1a1', 's1a2'])
+        self.assertSelects('.s1 > a span', ['s1a2s1'])
+        
+    def test_child_selector_id(self):
+        self.assertSelects('.s1 > a#s1a2 span', ['s1a2s1'])
+
+    def test_attribute_equals(self):
+        self.assertSelectMultiple(
+            ('p[class="onep"]', ['p1']),
+            ('p[id="p1"]', ['p1']),
+            ('[class="onep"]', ['p1']),
+            ('[id="p1"]', ['p1']),
+            ('link[rel="stylesheet"]', ['l1']),
+            ('link[type="text/css"]', ['l1']),
+            ('link[href="blah.css"]', ['l1']),
+            ('link[href="no-blah.css"]', []),
+            ('[rel="stylesheet"]', ['l1']),
+            ('[type="text/css"]', ['l1']),
+            ('[href="blah.css"]', ['l1']),
+            ('[href="no-blah.css"]', []),
+            ('p[href="no-blah.css"]', []),
+            ('[href="no-blah.css"]', []),
+        )
+
+    def test_attribute_tilde(self):
+        self.assertSelectMultiple(
+            ('p[class~="class1"]', ['pmulti']),
+            ('p[class~="class2"]', ['pmulti']),
+            ('p[class~="class3"]', ['pmulti']),
+            ('[class~="class1"]', ['pmulti']),
+            ('[class~="class2"]', ['pmulti']),
+            ('[class~="class3"]', ['pmulti']),
+            ('a[rel~="friend"]', ['bob']),
+            ('a[rel~="met"]', ['bob']),
+            ('[rel~="friend"]', ['bob']),
+            ('[rel~="met"]', ['bob']),
+        )
+
+    def test_attribute_startswith(self):
+        self.assertSelectMultiple(
+            ('[rel^="style"]', ['l1']),
+            ('link[rel^="style"]', ['l1']),
+            ('notlink[rel^="notstyle"]', []),
+            ('[rel^="notstyle"]', []),
+            ('link[rel^="notstyle"]', []),
+            ('link[href^="bla"]', ['l1']),
+            ('a[href^="http://"]', ['bob', 'me']),
+            ('[href^="http://"]', ['bob', 'me']),
+            ('[id^="p"]', ['pmulti', 'p1']),
+            ('[id^="m"]', ['me', 'main']),
+            ('div[id^="m"]', ['main']),
+            ('a[id^="m"]', ['me']),
+        )
+
+    def test_attribute_endswith(self):
+        self.assertSelectMultiple(
+            ('[href$=".css"]', ['l1']),
+            ('link[href$=".css"]', ['l1']),
+            ('link[id$="1"]', ['l1']),
+            ('[id$="1"]', ['l1', 'p1', 'header1', 's1a1', 's2a1', 's1a2s1']),
+            ('div[id$="1"]', []),
+            ('[id$="noending"]', []),
+        )
+
+    def test_attribute_contains(self):
+        self.assertSelectMultiple(
+            # From test_attribute_startswith
+            ('[rel*="style"]', ['l1']),
+            ('link[rel*="style"]', ['l1']),
+            ('notlink[rel*="notstyle"]', []),
+            ('[rel*="notstyle"]', []),
+            ('link[rel*="notstyle"]', []),
+            ('link[href*="bla"]', ['l1']),
+            ('a[href*="http://"]', ['bob', 'me']),
+            ('[href*="http://"]', ['bob', 'me']),
+            ('[id*="p"]', ['pmulti', 'p1']),
+            ('div[id*="m"]', ['main']),
+            ('a[id*="m"]', ['me']),
+            # From test_attribute_endswith
+            ('[href*=".css"]', ['l1']),
+            ('link[href*=".css"]', ['l1']),
+            ('link[id*="1"]', ['l1']),
+            ('[id*="1"]', ['l1', 'p1', 'header1', 's1a1', 's1a2', 's2a1', 's1a2s1']),
+            ('div[id*="1"]', []),
+            ('[id*="noending"]', []),
+            # New for this test
+            ('[href*="."]', ['bob', 'me', 'l1']),
+            ('a[href*="."]', ['bob', 'me']),
+            ('link[href*="."]', ['l1']),
+            ('div[id*="n"]', ['main', 'inner']),
+            ('div[id*="nn"]', ['inner']),
+        )
+
+    def test_attribute_exact_or_hypen(self):
+        self.assertSelectMultiple(
+            ('p[lang|="en"]', ['lang-en', 'lang-en-gb', 'lang-en-us']),
+            ('[lang|="en"]', ['lang-en', 'lang-en-gb', 'lang-en-us']),
+            ('p[lang|="fr"]', ['lang-fr']),
+            ('p[lang|="gb"]', []),
+        )
+
+    def test_attribute_exists(self):
+        self.assertSelectMultiple(
+            ('[rel]', ['l1', 'bob', 'me']),
+            ('link[rel]', ['l1']),
+            ('a[rel]', ['bob', 'me']),
+            ('[lang]', ['lang-en', 'lang-en-gb', 'lang-en-us', 'lang-fr']),
+            ('p[class]', ['p1', 'pmulti']),
+            ('[blah]', []),
+            ('p[blah]', []),
+        )
+        
+    def test_nth_of_type(self):
+        # Try to select first paragraph
+        els = self.soup.select('div#inner p:nth-of-type(1)')
+        self.assertEqual(len(els), 1)
+        self.assertEqual(els[0].string, u'Some text')
+        
+        # Try to select third paragraph
+        els = self.soup.select('div#inner p:nth-of-type(3)')
+        self.assertEqual(len(els), 1)
+        self.assertEqual(els[0].string, u'Another')
+        
+        # Try to select (non-existent!) fourth paragraph
+        els = self.soup.select('div#inner p:nth-of-type(4)')
+        self.assertEqual(len(els), 0)
+        
+    def test_nth_of_type_direct_descendant(self):
+        els = self.soup.select('div#inner > p:nth-of-type(1)')
+        self.assertEqual(len(els), 1)
+        self.assertEqual(els[0].string, u'Some text')
+
+    def test_id_child_selector_nth_of_type(self):
+        self.assertSelects('#inner > p:nth-of-type(2)', ['p1'])
+
+    def test_select_on_element(self):
+        # Other tests operate on the tree; this operates on an element
+        # within the tree.
+        inner = self.soup.find("div", id="main")
+        selected = inner.select("div")
+        # The 
         tag was selected. The