--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.9/site-packages/rdflib_jsonld/util.py	Mon Mar 22 18:12:50 2021 +0000
@@ -0,0 +1,81 @@
+try:
+    import json
+    assert json  # workaround for pyflakes issue #13
+except ImportError:
+    import simplejson as json
+
+from ._compat import IS_PY3 as PY3
+
+from os import sep
+from os.path import normpath
+if PY3:
+    from urllib.parse import urljoin, urlsplit, urlunsplit
+else:
+    from urllib.parse import urljoin, urlsplit, urlunsplit
+
+from rdflib.parser import create_input_source
+if PY3:
+    from io import StringIO
+
+
+def source_to_json(source):
+    # TODO: conneg for JSON (fix support in rdflib's URLInputSource!)
+    source = create_input_source(source, format='json-ld')
+
+    stream = source.getByteStream()
+    try:
+        if PY3:
+            return json.load(StringIO(stream.read().decode('utf-8')))
+        else:
+            return json.load(stream)
+    finally:
+        stream.close()
+
+
+VOCAB_DELIMS = ('#', '/', ':')
+
+def split_iri(iri):
+    for delim in VOCAB_DELIMS:
+        at = iri.rfind(delim)
+        if at > -1:
+            return iri[:at+1], iri[at+1:]
+    return iri, None
+
+def norm_url(base, url):
+    """
+    >>> norm_url('http://example.org/', '/one')
+    'http://example.org/one'
+    >>> norm_url('http://example.org/', '/one#')
+    'http://example.org/one#'
+    >>> norm_url('http://example.org/one', 'two')
+    'http://example.org/two'
+    >>> norm_url('http://example.org/one/', 'two')
+    'http://example.org/one/two'
+    >>> norm_url('http://example.org/', 'http://example.net/one')
+    'http://example.net/one'
+    >>> norm_url('http://example.org/', 'http://example.org//one')
+    'http://example.org//one'
+    """
+    parts = urlsplit(urljoin(base, url))
+    path = normpath(parts[2])
+    if sep != '/':
+        path = '/'.join(path.split(sep))
+    if parts[2].endswith('/') and not path.endswith('/'):
+        path += '/'
+    result = urlunsplit(parts[0:2] + (path,) + parts[3:])
+    if url.endswith('#') and not result.endswith('#'):
+        result += '#'
+    return result
+
+def context_from_urlinputsource(source):
+    if source.content_type == 'application/json':
+        # response_info was added to InputSource in rdflib 4.2
+        try:
+            links = source.response_info.getallmatchingheaders('Link')
+        except AttributeError:
+            return
+        for link in links:
+            if ' rel="http://www.w3.org/ns/json-ld#context"' in link:
+                i, j = link.index('<'), link.index('>')
+                if i > -1 and j > -1:
+                    return urljoin(source.url, link[i+1:j])