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saxutils.py12.0 KB · 370 lines
"""\A library of useful helper classes to the SAX classes, for theconvenience of application and driver writers.""" import os, urllib.parse, urllib.requestimport ioimport codecsfrom . import handlerfrom . import xmlreader def __dict_replace(s, d):    """Replace substrings of a string using a dictionary."""    for key, value in d.items():        s = s.replace(key, value)    return s 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.    """     # must do ampersand first    data = data.replace("&", "&amp;")    data = data.replace(">", "&gt;")    data = data.replace("<", "&lt;")    if entities:        data = __dict_replace(data, entities)    return data def unescape(data, entities={}):    """Unescape &amp;, &lt;, and &gt; in a string of data.     You can unescape 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 = data.replace("&lt;", "<")    data = data.replace("&gt;", ">")    if entities:        data = __dict_replace(data, entities)    # must do ampersand last    return data.replace("&amp;", "&") def quoteattr(data, entities={}):    """Escape and quote an attribute value.     Escape &, <, and > in a string of data, then quote it for use as    an attribute value.  The \" character will be escaped as well, if    necessary.     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.    """    entities = {**entities, '\n': '&#10;', '\r': '&#13;', '\t':'&#9;'}    data = escape(data, entities)    if '"' in data:        if "'" in data:            data = '"%s"' % data.replace('"', "&quot;")        else:            data = "'%s'" % data    else:        data = '"%s"' % data    return data  def _gettextwriter(out, encoding):    if out is None:        import sys        return sys.stdout     if isinstance(out, io.TextIOBase):        # use a text writer as is        return out     if isinstance(out, (codecs.StreamWriter, codecs.StreamReaderWriter)):        # use a codecs stream writer as is        return out     # wrap a binary writer with TextIOWrapper    if isinstance(out, io.RawIOBase):        # Keep the original file open when the TextIOWrapper is        # destroyed        class _wrapper:            __class__ = out.__class__            def __getattr__(self, name):                return getattr(out, name)        buffer = _wrapper()        buffer.close = lambda: None    else:        # This is to handle passed objects that aren't in the        # IOBase hierarchy, but just have a write method        buffer = io.BufferedIOBase()        buffer.writable = lambda: True        buffer.write = out.write        try:            # TextIOWrapper uses this methods to determine            # if BOM (for UTF-16, etc) should be added            buffer.seekable = out.seekable            buffer.tell = out.tell        except AttributeError:            pass    return io.TextIOWrapper(buffer, encoding=encoding,                            errors='xmlcharrefreplace',                            newline='\n',                            write_through=True) class XMLGenerator(handler.ContentHandler):     def __init__(self, out=None, encoding="iso-8859-1", short_empty_elements=False):        handler.ContentHandler.__init__(self)        out = _gettextwriter(out, encoding)        self._write = out.write        self._flush = out.flush        self._ns_contexts = [{}] # contains uri -> prefix dicts        self._current_context = self._ns_contexts[-1]        self._undeclared_ns_maps = []        self._encoding = encoding        self._short_empty_elements = short_empty_elements        self._pending_start_element = False     def _qname(self, name):        """Builds a qualified name from a (ns_url, localname) pair"""        if name[0]:            # Per http://www.w3.org/XML/1998/namespace, The 'xml' prefix is            # bound by definition to http://www.w3.org/XML/1998/namespace.  It            # does not need to be declared and will not usually be found in            # self._current_context.            if 'http://www.w3.org/XML/1998/namespace' == name[0]:                return 'xml:' + name[1]            # The name is in a non-empty namespace            prefix = self._current_context[name[0]]            if prefix:                # If it is not the default namespace, prepend the prefix                return prefix + ":" + name[1]        # Return the unqualified name        return name[1]     def _finish_pending_start_element(self,endElement=False):        if self._pending_start_element:            self._write('>')            self._pending_start_element = False     # ContentHandler methods     def startDocument(self):        self._write('<?xml version="1.0" encoding="%s"?>\n' %                        self._encoding)     def endDocument(self):        self._flush()     def startPrefixMapping(self, prefix, uri):        self._ns_contexts.append(self._current_context.copy())        self._current_context[uri] = prefix        self._undeclared_ns_maps.append((prefix, uri))     def endPrefixMapping(self, prefix):        self._current_context = self._ns_contexts[-1]        del self._ns_contexts[-1]     def startElement(self, name, attrs):        self._finish_pending_start_element()        self._write('<' + name)        for (name, value) in attrs.items():            self._write(' %s=%s' % (name, quoteattr(value)))        if self._short_empty_elements:            self._pending_start_element = True        else:            self._write(">")     def endElement(self, name):        if self._pending_start_element:            self._write('/>')            self._pending_start_element = False        else:            self._write('</%s>' % name)     def startElementNS(self, name, qname, attrs):        self._finish_pending_start_element()        self._write('<' + self._qname(name))         for prefix, uri in self._undeclared_ns_maps:            if prefix:                self._write(' xmlns:%s="%s"' % (prefix, uri))            else:                self._write(' xmlns="%s"' % uri)        self._undeclared_ns_maps = []         for (name, value) in attrs.items():            self._write(' %s=%s' % (self._qname(name), quoteattr(value)))        if self._short_empty_elements:            self._pending_start_element = True        else:            self._write(">")     def endElementNS(self, name, qname):        if self._pending_start_element:            self._write('/>')            self._pending_start_element = False        else:            self._write('</%s>' % self._qname(name))     def characters(self, content):        if content:            self._finish_pending_start_element()            if not isinstance(content, str):                content = str(content, self._encoding)            self._write(escape(content))     def ignorableWhitespace(self, content):        if content:            self._finish_pending_start_element()            if not isinstance(content, str):                content = str(content, self._encoding)            self._write(content)     def processingInstruction(self, target, data):        self._finish_pending_start_element()        self._write('<?%s %s?>' % (target, data))  class XMLFilterBase(xmlreader.XMLReader):    """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."""     def __init__(self, parent = None):        xmlreader.XMLReader.__init__(self)        self._parent = parent     # 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):        self._cont_handler.endElement(name)     def startElementNS(self, name, qname, attrs):        self._cont_handler.startElementNS(name, qname, attrs)     def endElementNS(self, name, qname):        self._cont_handler.endElementNS(name, qname)     def characters(self, content):        self._cont_handler.characters(content)     def ignorableWhitespace(self, chars):        self._cont_handler.ignorableWhitespace(chars)     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):        return 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)     # XMLFilter methods     def getParent(self):        return self._parent     def setParent(self, parent):        self._parent = parent # --- Utility functions def prepare_input_source(source, base=""):    """This function takes an InputSource and an optional base URL and    returns a fully resolved InputSource object ready for reading."""     if isinstance(source, os.PathLike):        source = os.fspath(source)    if isinstance(source, str):        source = xmlreader.InputSource(source)    elif hasattr(source, "read"):        f = source        source = xmlreader.InputSource()        if isinstance(f.read(0), str):            source.setCharacterStream(f)        else:            source.setByteStream(f)        if hasattr(f, "name") and isinstance(f.name, str):            source.setSystemId(f.name)     if source.getCharacterStream() is None and source.getByteStream() is None:        sysid = source.getSystemId()        basehead = os.path.dirname(os.path.normpath(base))        sysidfilename = os.path.join(basehead, sysid)        if os.path.isfile(sysidfilename):            source.setSystemId(sysidfilename)            f = open(sysidfilename, "rb")        else:            source.setSystemId(urllib.parse.urljoin(base, sysid))            f = urllib.request.urlopen(source.getSystemId())         source.setByteStream(f)     return source