/usr/lib/python3/dist-packages/rdflib/parser.py is in python3-rdflib 4.1.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 sys
from urllib.request import pathname2url, url2pathname
from urllib.request import urlopen, Request
from urllib.parse import urljoin
from rdflib.py3compat import PY3
if PY3:
from io import BytesIO
assert BytesIO
else:
from io import StringIO as BytesIO
from xml.sax import xmlreader
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)
# Fix for issue 130 https://github.com/RDFLib/rdflib/issues/130
self.url = file.geturl() # in case redirections took place
self.setPublicId(self.url)
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):
def __init__(self, file):
base = urljoin("file:", pathname2url(os.getcwd()))
system_id = URIRef(urljoin("file:", pathname2url(file.name)), base=base)
super(FileInputSource, self).__init__(system_id)
self.file = file
self.setByteStream(file)
# TODO: self.setEncoding(encoding)
def __repr__(self):
return repr(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, str):
location = source
elif hasattr(source, "read") and not isinstance(source, Namespace):
f = source
input_source = InputSource()
input_source.setByteStream(f)
if f is sys.stdin:
input_source.setSystemId("file:///dev/stdin")
elif hasattr(f, "name"):
input_source.setSystemId(f.name)
else:
raise Exception("Unexpected type '%s' for source '%s'" %
(type(source), source))
absolute_location = None # Further to fix for issue 130
if location is not None:
# Fix for Windows problem https://github.com/RDFLib/rdflib/issues/145
if os.path.exists(location):
location = pathname2url(location)
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 # Further to fix
# for issue 130
if file is not None:
input_source = FileInputSource(file)
if data is not None:
if isinstance(data, str):
data = data.encode('utf-8')
input_source = StringInputSource(data)
if input_source is None:
raise Exception("could not create InputSource")
else:
if publicID is not None: # Further to fix for issue 130
input_source.setPublicId(publicID)
# Further to fix for issue 130
elif input_source.getPublicId() is None:
input_source.setPublicId(absolute_location or "")
return input_source
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