📄 basehtmlprocessor.py

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"""Base class for creating HTML processing modulesThis class is designed to take HTML as input and spit out equivalentHTML as output.  By itself it's not very interesting; you use it bysubclassing it and providing the methods you need to create your HTMLtransformation.This program is part of "Dive Into Python", a free Python book forexperienced programmers.  Visit http://diveintopython.org/ for thelatest version."""__author__ = "Mark Pilgrim (mark@diveintopython.org)"__version__ = "$Revision: 1.2 $"__date__ = "$Date: 2004/05/05 21:57:19 $"__copyright__ = "Copyright (c) 2001 Mark Pilgrim"__license__ = "Python"from sgmllib import SGMLParserimport htmlentitydefsclass BaseHTMLProcessor(SGMLParser):	def reset(self):		# extend (called by SGMLParser.__init__)		self.pieces = []		SGMLParser.reset(self)			def unknown_starttag(self, tag, attrs):		# called for each start tag		# attrs is a list of (attr, value) tuples		# e.g. for <pre class="screen">, tag="pre", attrs=[("class", "screen")]		# Ideally we would like to reconstruct original tag and attributes, but		# we may end up quoting attribute values that weren't quoted in the source		# document, or we may change the type of quotes around the attribute value		# (single to double quotes).		# Note that improperly embedded non-HTML code (like client-side Javascript)		# may be parsed incorrectly by the ancestor, causing runtime script errors.		# All non-HTML code must be enclosed in HTML comment tags (<!-- code -->)		# to ensure that it will pass through this parser unaltered (in handle_comment).		strattrs = "".join([' %s="%s"' % (key, value) for key, value in attrs])		self.pieces.append("<%(tag)s%(strattrs)s>" % locals())			def unknown_endtag(self, tag):		# called for each end tag, e.g. for </pre>, tag will be "pre"		# Reconstruct the original end tag.		self.pieces.append("</%(tag)s>" % locals())	def handle_charref(self, ref):		# called for each character reference, e.g. for "&#160;", ref will be "160"		# Reconstruct the original character reference.		self.pieces.append("&#%(ref)s;" % locals())			def handle_entityref(self, ref):		# called for each entity reference, e.g. for "&copy;", ref will be "copy"		# Reconstruct the original entity reference.		self.pieces.append("&%(ref)s" % locals())		# standard HTML entities are closed with a semicolon; other entities are not		if htmlentitydefs.entitydefs.has_key(ref):			self.pieces.append(";")	def handle_data(self, text):		# called for each block of plain text, i.e. outside of any tag and		# not containing any character or entity references		# Store the original text verbatim.		self.pieces.append(text)			def handle_comment(self, text):		# called for each HTML comment, e.g. <!-- insert Javascript code here -->		# Reconstruct the original comment.		# It is especially important that the source document enclose client-side		# code (like Javascript) within comments so it can pass through this		# processor undisturbed; see comments in unknown_starttag for details.		self.pieces.append("<!--%(text)s-->" % locals())			def handle_pi(self, text):		# called for each processing instruction, e.g. <?instruction>		# Reconstruct original processing instruction.		self.pieces.append("<?%(text)s>" % locals())	def handle_decl(self, text):		# called for the DOCTYPE, if present, e.g.		# <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"		#	 "http://www.w3.org/TR/html4/loose.dtd">		# Reconstruct original DOCTYPE		self.pieces.append("<!%(text)s>" % locals())			def output(self):		"""Return processed HTML as a single string"""		return "".join(self.pieces)if __name__ == "__main__":	for k, v in globals().items():		print k, "=", v
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