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"""Beautiful Soup Elixir and Tonic "The Screen-Scraper's Friend" http://www.crummy.com/software/BeautifulSoup/ Beautiful Soup parses a (possibly invalid) XML or HTML document into a tree representation. It provides methods and Pythonic idioms that make it easy to navigate, search, and modify the tree. A well-formed XML/HTML document yields a well-formed data structure. An ill-formed XML/HTML document yields a correspondingly ill-formed data structure. If your document is only locally well-formed, you can use this library to find and process the well-formed part of it. The BeautifulSoup class Beautiful Soup works with Python 2.2 and up. It has no external dependencies, but you'll have more success at converting data to UTF-8 if you also install these three packages: * chardet, for auto-detecting character encodings http://chardet.feedparser.org/ * cjkcodecs and iconv_codec, which add more encodings to the ones supported by stock Python. http://cjkpython.i18n.org/ Beautiful Soup defines classes for two main parsing strategies: * BeautifulStoneSoup, for parsing XML, SGML, or your domain-specific language that kind of looks like XML. * BeautifulSoup, for parsing run-of-the-mill HTML code, be it valid or invalid. This class has web browser-like heuristics for obtaining a sensible parse tree in the face of common HTML errors. Beautiful Soup also defines a class (UnicodeDammit) for autodetecting the encoding of an HTML or XML document, and converting it to Unicode. Much of this code is taken from Mark Pilgrim's Universal Feed Parser. For more than you ever wanted to know about Beautiful Soup, see the documentation: http://www.crummy.com/software/BeautifulSoup/documentation.html """ from __future__ import generators __author__ = "Leonard Richardson (leonardr@segfault.org)" __version__ = "3.0.4" __copyright__ = "Copyright (c) 2004-2007 Leonard Richardson" __license__ = "PSF" from sgmllib import SGMLParser, SGMLParseError import codecs import types import re import sgmllib try: from htmlentitydefs import name2codepoint except ImportError: name2codepoint = {} #This hack makes Beautiful Soup able to parse XML with namespaces sgmllib.tagfind = re.compile('[a-zA-Z][-_.:a-zA-Z0-9]*') DEFAULT_OUTPUT_ENCODING = "utf-8" # First, the classes that represent markup elements. class PageElement: """Contains the navigational information for some part of the page (either a tag or a piece of text)""" def setup(self, parent=None, previous=None): """Sets up the initial relations between this element and other elements.""" self.parent = parent self.previous = previous self.next = None self.previousSibling = None self.nextSibling = None if self.parent and self.parent.contents: self.previousSibling = self.parent.contents[-1] self.previousSibling.nextSibling = self def replaceWith(self, replaceWith): oldParent = self.parent myIndex = self.parent.contents.index(self) if hasattr(replaceWith, 'parent') and replaceWith.parent == self.parent: # We're replacing this element with one of its siblings. index = self.parent.contents.index(replaceWith) if index and index < myIndex: # Furthermore, it comes before this element. That # means that when we extract it, the index of this # element will change. myIndex = myIndex - 1 self.extract() oldParent.insert(myIndex, replaceWith) def extract(self): """Destructively rips this element out of the tree.""" if self.parent: try: self.parent.contents.remove(self) except ValueError: pass #Find the two elements that would be next to each other if #this element (and any children) hadn't been parsed. Connect #the two. lastChild = self._lastRecursiveChild() nextElement = lastChild.next if self.previous: self.previous.next = nextElement if nextElement: nextElement.previous = self.previous self.previous = None lastChild.next = None self.parent = None if self.previousSibling: self.previousSibling.nextSibling = self.nextSibling if self.nextSibling: self.nextSibling.previousSibling = self.previousSibling self.previousSibling = self.nextSibling = None def _lastRecursiveChild(self): "Finds the last element beneath this object to be parsed." lastChild = self while hasattr(lastChild, 'contents') and lastChild.contents: lastChild = lastChild.contents[-1] return lastChild def insert(self, position, newChild): if (isinstance(newChild, basestring) or isinstance(newChild, unicode)) \ and not isinstance(newChild, NavigableString): newChild = NavigableString(newChild) position = min(position, len(self.contents)) if hasattr(newChild, 'parent') and newChild.parent != None: # We're 'inserting' an element that's already one # of this object's children. if newChild.parent == self: index = self.find(newChild) if index and index < position: # Furthermore we're moving it 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 = position - 1 newChild.extract() newChild.parent = self previousChild = None if position == 0: newChild.previousSibling = None newChild.previous = self else: previousChild = self.contents[position-1] newChild.previousSibling = previousChild newChild.previousSibling.nextSibling = newChild newChild.previous = previousChild._lastRecursiveChild() if newChild.previous: newChild.previous.next = newChild newChildsLastElement = newChild._lastRecursiveChild() if position >= len(self.contents): newChild.nextSibling = None parent = self parentsNextSibling = None while not parentsNextSibling: parentsNextSibling = parent.nextSibling parent = parent.parent if not parent: # This is the last element in the document. break if parentsNextSibling: newChildsLastElement.next = parentsNextSibling else: newChildsLastElement.next = None else: nextChild = self.contents[position] newChild.nextSibling = nextChild if newChild.nextSibling: newChild.nextSibling.previousSibling = newChild newChildsLastElement.next = nextChild if newChildsLastElement.next: newChildsLastElement.next.previous = newChildsLastElement self.contents.insert(position, newChild) def findNext(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._findOne(self.findAllNext, name, attrs, text, **kwargs) def findAllNext(self, name=None, attrs={}, text=None, limit=None, **kwargs): """Returns all items that match the given criteria and appear before after Tag in the document.""" return self._findAll(name, attrs, text, limit, self.nextGenerator) def findNextSibling(self, name=None, attrs={}, text=None, **kw