--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/rdflib/parser.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,209 @@
+"""
+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
+        self.auto_close = False  # see Graph.parse(), true if opened by us
+
+    def close(self):
+        f = self.getByteStream()
+        if f and hasattr(f, 'close'):
+            f.close()
+
+
+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'
+        elif format == 'json-ld':
+            myheaders['Accept'] = (
+                'application/ld+json, application/json;p=0.9, */*;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')
+        if self.content_type is not None:
+            self.content_type = self.content_type.split(";", 1)[0]
+        self.setByteStream(file)
+        # TODO: self.setEncoding(encoding)
+        self.response_info = file.info() # a mimetools.Message instance
+
+    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.
+    """
+
+    # test that exactly one of source, location, file, and data is not None.
+    if sum((
+        source is not None,
+        location is not None,
+        file is not None,
+        data is not None,
+    )) != 1:
+        raise ValueError(
+            'exactly one of source, location, file or data must be given'
+        )
+
+    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
+
+    auto_close = False  # make sure we close all file handles we open
+    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)
+        auto_close = True
+        # 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)
+        auto_close = True
+
+    if input_source is None:
+        raise Exception("could not create InputSource")
+    else:
+        input_source.auto_close |= auto_close
+        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