214 lines
6.6 KiB
Python
214 lines
6.6 KiB
Python
"""\
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A library of useful helper classes to the SAX classes, for the
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convenience of application and driver writers.
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"""
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import os, urlparse, urllib, types
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import handler
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import xmlreader
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_StringTypes = [types.StringType, types.UnicodeType]
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def escape(data, entities={}):
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"""Escape &, <, and > in a string of data.
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You can escape other strings of data by passing a dictionary as
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the optional entities parameter. The keys and values must all be
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strings; each key will be replaced with its corresponding value.
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"""
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data = data.replace("&", "&")
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data = data.replace("<", "<")
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data = data.replace(">", ">")
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for chars, entity in entities.items():
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data = data.replace(chars, entity)
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return data
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class XMLGenerator(handler.ContentHandler):
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def __init__(self, out=None, encoding="iso-8859-1"):
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if out is None:
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import sys
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out = sys.stdout
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handler.ContentHandler.__init__(self)
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self._out = out
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self._ns_contexts = [{}] # contains uri -> prefix dicts
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self._current_context = self._ns_contexts[-1]
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self._undeclared_ns_maps = []
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self._encoding = encoding
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# ContentHandler methods
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def startDocument(self):
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self._out.write('<?xml version="1.0" encoding="%s"?>\n' %
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self._encoding)
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def startPrefixMapping(self, prefix, uri):
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self._ns_contexts.append(self._current_context.copy())
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self._current_context[uri] = prefix
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self._undeclared_ns_maps.append((prefix, uri))
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def endPrefixMapping(self, prefix):
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self._current_context = self._ns_contexts[-1]
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del self._ns_contexts[-1]
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def startElement(self, name, attrs):
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self._out.write('<' + name)
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for (name, value) in attrs.items():
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self._out.write(' %s="%s"' % (name, escape(value)))
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self._out.write('>')
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def endElement(self, name):
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self._out.write('</%s>' % name)
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def startElementNS(self, name, qname, attrs):
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name = self._current_context[name[0]] + ":" + name[1]
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self._out.write('<' + name)
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for pair in self._undeclared_ns_maps:
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self._out.write(' xmlns:%s="%s"' % pair)
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self._undeclared_ns_maps = []
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for (name, value) in attrs.items():
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name = self._current_context[name[0]] + ":" + name[1]
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self._out.write(' %s="%s"' % (name, escape(value)))
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self._out.write('>')
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def endElementNS(self, name, qname):
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name = self._current_context[name[0]] + ":" + name[1]
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self._out.write('</%s>' % name)
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def characters(self, content):
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self._out.write(escape(content))
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def ignorableWhitespace(self, content):
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self._out.write(content)
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def processingInstruction(self, target, data):
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self._out.write('<?%s %s?>' % (target, data))
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class XMLFilterBase(xmlreader.XMLReader):
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"""This class is designed to sit between an XMLReader and the
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client application's event handlers. By default, it does nothing
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but pass requests up to the reader and events on to the handlers
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unmodified, but subclasses can override specific methods to modify
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the event stream or the configuration requests as they pass
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through."""
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# ErrorHandler methods
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def error(self, exception):
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self._err_handler.error(exception)
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def fatalError(self, exception):
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self._err_handler.fatalError(exception)
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def warning(self, exception):
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self._err_handler.warning(exception)
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# ContentHandler methods
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def setDocumentLocator(self, locator):
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self._cont_handler.setDocumentLocator(locator)
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def startDocument(self):
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self._cont_handler.startDocument()
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def endDocument(self):
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self._cont_handler.endDocument()
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def startPrefixMapping(self, prefix, uri):
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self._cont_handler.startPrefixMapping(prefix, uri)
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def endPrefixMapping(self, prefix):
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self._cont_handler.endPrefixMapping(prefix)
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def startElement(self, name, attrs):
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self._cont_handler.startElement(name, attrs)
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def endElement(self, name):
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self._cont_handler.endElement(name)
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def startElementNS(self, name, qname, attrs):
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self._cont_handler.startElement(name, attrs)
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def endElementNS(self, name, qname):
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self._cont_handler.endElementNS(name, qname)
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def characters(self, content):
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self._cont_handler.characters(content)
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def ignorableWhitespace(self, chars):
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self._cont_handler.ignorableWhitespace(chars)
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def processingInstruction(self, target, data):
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self._cont_handler.processingInstruction(target, data)
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def skippedEntity(self, name):
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self._cont_handler.skippedEntity(name)
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# DTDHandler methods
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def notationDecl(self, name, publicId, systemId):
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self._dtd_handler.notationDecl(name, publicId, systemId)
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def unparsedEntityDecl(self, name, publicId, systemId, ndata):
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self._dtd_handler.unparsedEntityDecl(name, publicId, systemId, ndata)
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# EntityResolver methods
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def resolveEntity(self, publicId, systemId):
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self._ent_handler.resolveEntity(publicId, systemId)
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# XMLReader methods
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def parse(self, source):
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self._parent.setContentHandler(self)
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self._parent.setErrorHandler(self)
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self._parent.setEntityResolver(self)
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self._parent.setDTDHandler(self)
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self._parent.parse(source)
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def setLocale(self, locale):
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self._parent.setLocale(locale)
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def getFeature(self, name):
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return self._parent.getFeature(name)
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def setFeature(self, name, state):
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self._parent.setFeature(name, state)
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def getProperty(self, name):
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return self._parent.getProperty(name)
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def setProperty(self, name, value):
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self._parent.setProperty(name, value)
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# --- Utility functions
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def prepare_input_source(source, base = ""):
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"""This function takes an InputSource and an optional base URL and
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returns a fully resolved InputSource object ready for reading."""
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if type(source) in _StringTypes:
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source = xmlreader.InputSource(source)
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elif hasattr(source, "read"):
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f = source
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source = xmlreader.InputSource(source)
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source.setByteStream(f)
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if source.getByteStream() is None:
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sysid = source.getSystemId()
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if os.path.isfile(sysid):
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basehead = os.path.split(os.path.normpath(base))[0]
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source.setSystemId(os.path.join(basehead, sysid))
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f = open(sysid, "rb")
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else:
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source.setSystemId(urlparse.urljoin(base, sysid))
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f = urllib.urlopen(source.getSystemId())
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source.setByteStream(f)
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return source
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