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"""
A library of useful helper classes to the sax classes, for the
convenience of application and driver writers.
$Id$
"""
import types, string, sys
import handler
def escape(data, entities = {}):
"""Escape &, <, and > in a string of data.
You can escape other strings of data by passing a dictionary as
the optional entities parameter. The keys and values must all be
strings; each key will be replaced with its corresponding value.
"""
data = string.replace(data, "&", "&")
data = string.replace(data, "<", "<")
data = string.replace(data, ">", ">")
for chars, entity in entities.items():
data = string.replace(data, chars, entity)
return data
class XMLGenerator(handler.ContentHandler):
def __init__(self, out = sys.stdout):
handler.ContentHandler.__init__(self)
self._out = out
# ContentHandler methods
def startDocument(self):
self._out.write('<?xml version="1.0" encoding="iso-8859-1"?>\n')
def startPrefixMapping(self, prefix, uri):
pass
def endPrefixMapping(self, prefix):
pass
def startElement(self, name, attrs):
if type(name)==type(()):
uri, localname, prefix=name
name="%s:%s"%(prefix,localname)
self._out.write('<' + name)
for (name, value) in attrs.items():
self._out.write(' %s="%s"' % (name, escape(value)))
self._out.write('>')
def endElement(self, name):
# FIXME: not namespace friendly yet
self._out.write('</%s>' % name)
def characters(self, content):
self._out.write(escape(content))
def ignorableWhitespace(self, content):
self._out.write(content)
def processingInstruction(self, target, data):
self._out.write('<?%s %s?>' % (target, data))
class XMLFilterBase:
"""This class is designed to sit between an XMLReader and the
client application's event handlers. By default, it does nothing
but pass requests up to the reader and events on to the handlers
unmodified, but subclasses can override specific methods to modify
the event stream or the configuration requests as they pass
through."""
# ErrorHandler methods
def error(self, exception):
self._err_handler.error(exception)
def fatalError(self, exception):
self._err_handler.fatalError(exception)
def warning(self, exception):
self._err_handler.warning(exception)
# ContentHandler methods
def setDocumentLocator(self, locator):
self._cont_handler.setDocumentLocator(locator)
def startDocument(self):
self._cont_handler.startDocument()
def endDocument(self):
self._cont_handler.endDocument()
def startPrefixMapping(self, prefix, uri):
self._cont_handler.startPrefixMapping(prefix, uri)
def endPrefixMapping(self, prefix):
self._cont_handler.endPrefixMapping(prefix)
def startElement(self, name, attrs):
self._cont_handler.startElement(name, attrs)
def endElement(self, name, qname):
self._cont_handler.endElement(name, qname)
def characters(self, content):
self._cont_handler.characters(content)
def ignorableWhitespace(self, chars, start, end):
self._cont_handler.ignorableWhitespace(chars, start, end)
def processingInstruction(self, target, data):
self._cont_handler.processingInstruction(target, data)
def skippedEntity(self, name):
self._cont_handler.skippedEntity(name)
# DTDHandler methods
def notationDecl(self, name, publicId, systemId):
self._dtd_handler.notationDecl(name, publicId, systemId)
def unparsedEntityDecl(self, name, publicId, systemId, ndata):
self._dtd_handler.unparsedEntityDecl(name, publicId, systemId, ndata)
# EntityResolver methods
def resolveEntity(self, publicId, systemId):
self._ent_handler.resolveEntity(publicId, systemId)
# XMLReader methods
def parse(self, source):
self._parent.setContentHandler(self)
self._parent.setErrorHandler(self)
self._parent.setEntityResolver(self)
self._parent.setDTDHandler(self)
self._parent.parse(source)
def setLocale(self, locale):
self._parent.setLocale(locale)
def getFeature(self, name):
return self._parent.getFeature(name)
def setFeature(self, name, state):
self._parent.setFeature(name, state)
def getProperty(self, name):
return self._parent.getProperty(name)
def setProperty(self, name, value):
self._parent.setProperty(name, value)
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