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"""
Parser plugin interface.
This module defines the parser plugin interface and contains other
related parser support code.
The module is mainly useful for those wanting to write a parser that
can plugin to rdflib. If you are wanting to invoke a parser you likely
want to do so through the Graph class parse method.
"""
import os
import __builtin__
import warnings
from urllib import pathname2url, url2pathname
from urllib2 import urlopen, Request, HTTPError
from urlparse import urljoin
try:
from io import BytesIO
except:
from StringIO import StringIO as BytesIO
from xml.sax import xmlreader
from xml.sax.saxutils import prepare_input_source
import types
from rdflib import __version__
from rdflib.term import URIRef
from rdflib.namespace import Namespace
__all__ = ['Parser', 'InputSource', 'StringInputSource', 'URLInputSource', 'FileInputSource']
class Parser(object):
def __init__(self):
pass
def parse(self, source, sink):
pass
class InputSource(xmlreader.InputSource, object):
"""
TODO:
"""
def __init__(self, system_id=None):
xmlreader.InputSource.__init__(self, system_id=system_id)
self.content_type = None
class StringInputSource(InputSource):
"""
TODO:
"""
def __init__(self, value, system_id=None):
super(StringInputSource, self).__init__(system_id)
stream = BytesIO(value)
self.setByteStream(stream)
# TODO:
# encoding = value.encoding
# self.setEncoding(encoding)
headers = {
'User-agent': 'rdflib-%s (http://rdflib.net/; eikeon@eikeon.com)' % __version__
}
class URLInputSource(InputSource):
"""
TODO:
"""
def __init__(self, system_id=None, format=None):
super(URLInputSource, self).__init__(system_id)
self.url = system_id
# copy headers to change
myheaders=dict(headers)
if format=='application/rdf+xml':
myheaders['Accept']='application/rdf+xml, */*;q=0.1'
elif format=='n3':
myheaders['Accept']='text/n3, */*;q=0.1'
elif format=='nt':
myheaders['Accept']='text/plain, */*;q=0.1'
else:
myheaders['Accept']='application/rdf+xml,text/rdf+n3;q=0.9,application/xhtml+xml;q=0.5, */*;q=0.1'
req = Request(system_id, None, myheaders)
file = urlopen(req)
self.content_type = file.info().get('content-type')
self.content_type = self.content_type.split(";", 1)[0]
self.setByteStream(file)
# TODO: self.setEncoding(encoding)
def __repr__(self):
return self.url
class FileInputSource(InputSource):
"""
TODO:
"""
def __init__(self, file):
base = urljoin("file:", pathname2url(os.getcwd()))
system_id = URIRef(file.name, base=base)
super(FileInputSource, self).__init__(system_id)
self.file = file
self.setByteStream(file)
# TODO: self.setEncoding(encoding)
def __repr__(self):
return `self.file`
def create_input_source(source=None, publicID=None,
location=None, file=None, data=None, format=None):
"""
Return an appropriate InputSource instance for the given
parameters.
"""
# TODO: test that exactly one of source, location, file, and data
# is not None.
input_source = None
if source is not None:
if isinstance(source, InputSource):
input_source = source
else:
if isinstance(source, basestring):
location = source
elif hasattr(source, "read") and not isinstance(source, Namespace):
f = source
input_source = InputSource()
input_source.setByteStream(f)
if hasattr(f, "name"):
input_source.setSystemId(f.name)
else:
raise Exception("Unexpected type '%s' for source '%s'" % (type(source), source))
if location is not None:
base = urljoin("file:", "%s/" % pathname2url(os.getcwd()))
absolute_location = URIRef(location, base=base).defrag()
if absolute_location.startswith("file:///"):
filename = url2pathname(absolute_location.replace("file:///", "/"))
file = open(filename, "rb")
else:
input_source = URLInputSource(absolute_location, format)
publicID = publicID or absolute_location
if file is not None:
input_source = FileInputSource(file)
if data is not None:
if isinstance(data, unicode):
data = data.encode('utf-8')
input_source = StringInputSource(data)
if input_source is None:
raise Exception("could not create InputSource")
else:
if publicID:
input_source.setPublicId(publicID)
# TODO: what motivated this bit?
id = input_source.getPublicId()
if id is None:
input_source.setPublicId("")
return input_source
|
