Remove (TypeCheck|SubjectType|PredicateType|ObjectType)Error and re…

…lated

Also remove
`check_(context|subject|predicate|object|statement|pattern)`.

It seems nothing is using these exceptions and functions.

Technically this does remove parts of the public API, but I would argue
they are "buggy" parts as anything that use them would be sorely
disappointed to find that the behaviour is not as expect, and these
functions/exceptions don't serve any function related to the aim of
RDFLib unless they are integrated with the rest of RDFLib.

rdflib/exceptions.py

@@ -4,11 +4,6 @@
 
 __all__ = [
     "Error",
-    "TypeCheckError",
-    "SubjectTypeError",
-    "PredicateTypeError",
-    "ObjectTypeError",
-    "ContextTypeError",
     "ParserError",
 ]
 
@@ -21,61 +16,6 @@ def __init__(self, msg=None):
         self.msg = msg
 
 
-class TypeCheckError(Error):
-    """Parts of assertions are subject to type checks."""
-
-    def __init__(self, node):
-        Error.__init__(self, node)
-        self.type = type(node)
-        self.node = node
-
-
-class SubjectTypeError(TypeCheckError):
-    """Subject of an assertion must be an instance of URIRef."""
-
-    def __init__(self, node):
-        TypeCheckError.__init__(self, node)
-        self.msg = "Subject must be instance of URIRef or BNode: %s(%s)" % (
-            self.node,
-            self.type,
-        )
-
-
-class PredicateTypeError(TypeCheckError):
-    """Predicate of an assertion must be an instance of URIRef."""
-
-    def __init__(self, node):
-        TypeCheckError.__init__(self, node)
-        self.msg = "Predicate must be a URIRef instance: %s(%s)" % (
-            self.node,
-            self.type,
-        )
-
-
-class ObjectTypeError(TypeCheckError):
-    """Object of an assertion must be an instance of URIRef, Literal,
-    or BNode."""
-
-    def __init__(self, node):
-        TypeCheckError.__init__(self, node)
-        self.msg = (
-            "\
-Object must be instance of URIRef, Literal, or BNode: %s(%s)"
-            % (self.node, self.type)
-        )
-
-
-class ContextTypeError(TypeCheckError):
-    """Context of an assertion must be an instance of URIRef."""
-
-    def __init__(self, node):
-        TypeCheckError.__init__(self, node)
-        self.msg = "Context must be instance of URIRef or BNode: %s(%s)" % (
-            self.node,
-            self.type,
-        )
-
-
 class ParserError(Error):
     """RDF Parser error."""
 

rdflib/util.py

@@ -18,15 +18,6 @@
 * date_time
 * parse_date_time
 
-Statement and component type checkers
-
-* check_context
-* check_subject
-* check_predicate
-* check_object
-* check_statement
-* check_pattern
-
 """
 
 from calendar import timegm
@@ -41,10 +32,6 @@
 
 from os.path import splitext
 
-from rdflib.exceptions import ContextTypeError
-from rdflib.exceptions import ObjectTypeError
-from rdflib.exceptions import PredicateTypeError
-from rdflib.exceptions import SubjectTypeError
 import rdflib.graph  # avoid circular dependency
 from rdflib.namespace import Namespace, XSD
 from rdflib.namespace import NamespaceManager
@@ -62,12 +49,6 @@
     "from_n3",
     "date_time",
     "parse_date_time",
-    "check_context",
-    "check_subject",
-    "check_predicate",
-    "check_object",
-    "check_statement",
-    "check_pattern",
     "guess_format",
     "find_roots",
     "get_tree",
@@ -235,55 +216,6 @@ def from_n3(s: str, default=None, backend=None, nsm=None):
         return BNode(s)
 
 
-def check_context(c):
-    if not (isinstance(c, URIRef) or isinstance(c, BNode)):
-        raise ContextTypeError("%s:%s" % (c, type(c)))
-
-
-def check_subject(s):
-    """Test that s is a valid subject identifier."""
-    if not (isinstance(s, URIRef) or isinstance(s, BNode)):
-        raise SubjectTypeError(s)
-
-
-def check_predicate(p):
-    """Test that p is a valid predicate identifier."""
-    if not isinstance(p, URIRef):
-        raise PredicateTypeError(p)
-
-
-def check_object(o):
-    """Test that o is a valid object identifier."""
-    if not (isinstance(o, URIRef) or isinstance(o, Literal) or isinstance(o, BNode)):
-        raise ObjectTypeError(o)
-
-
-def check_statement(triple):
-    (s, p, o) = triple
-    if not (isinstance(s, URIRef) or isinstance(s, BNode)):
-        raise SubjectTypeError(s)
-
-    if not isinstance(p, URIRef):
-        raise PredicateTypeError(p)
-
-    if not (isinstance(o, URIRef) or isinstance(o, Literal) or isinstance(o, BNode)):
-        raise ObjectTypeError(o)
-
-
-def check_pattern(triple):
-    (s, p, o) = triple
-    if s and not (isinstance(s, URIRef) or isinstance(s, BNode)):
-        raise SubjectTypeError(s)
-
-    if p and not isinstance(p, URIRef):
-        raise PredicateTypeError(p)
-
-    if o and not (
-        isinstance(o, URIRef) or isinstance(o, Literal) or isinstance(o, BNode)
-    ):
-        raise ObjectTypeError(o)
-
-
 def date_time(t=None, local_time_zone=False):
     """http://www.w3.org/TR/NOTE-datetime ex: 1997-07-16T19:20:30Z
 

test/test_util.py

@@ -12,10 +12,6 @@
 from rdflib.term import URIRef
 from rdflib import util
 from rdflib import XSD
-from rdflib.exceptions import SubjectTypeError
-from rdflib.exceptions import PredicateTypeError
-from rdflib.exceptions import ObjectTypeError
-from rdflib.exceptions import ContextTypeError
 
 n3source = """\
 @prefix : <http://www.w3.org/2000/10/swap/Primer#>.
@@ -347,60 +343,3 @@ def test_util_from_n3_not_escapes(self, string: str) -> None:
     def test_util_from_n3_not_escapes_xf(self, string: str) -> None:
         literal_str = str(util.from_n3(f'"{string}"'))
         assert literal_str == f"{string}"
-
-
-class TestUtilCheckers:
-    def setup_method(self):
-        self.c = URIRef("http://example.com")
-        self.s = BNode("http://example.com")
-        self.p = URIRef("http://example.com/predicates/isa")
-        self.o = Literal("Objectification")
-
-    def test_util_checker_exceptions(self):
-        c = "http://example.com"
-        with pytest.raises(ContextTypeError):
-            util.check_context(c)
-        with pytest.raises(SubjectTypeError):
-            util.check_subject(c)
-        with pytest.raises(PredicateTypeError):
-            util.check_predicate(c)
-        with pytest.raises(ObjectTypeError):
-            util.check_object(c)
-
-    def test_util_check_context(self):
-        res = util.check_context(self.c)
-        assert res == None
-
-    def test_util_check_subject(self):
-        res = util.check_subject(self.s)
-        assert res == None
-
-    def test_util_check_predicate(self):
-        res = util.check_predicate(self.p)
-        assert res == None
-
-    def test_util_check_object(self):
-        res = util.check_object(self.o)
-        assert res == None
-
-    def test_util_check_statement(self):
-        c = "http://example.com"
-        with pytest.raises(SubjectTypeError):
-            util.check_statement((c, self.p, self.o))
-        with pytest.raises(PredicateTypeError):
-            util.check_statement((self.s, c, self.o))
-        with pytest.raises(ObjectTypeError):
-            util.check_statement((self.s, self.p, c))
-        res = util.check_statement((self.s, self.p, self.o))
-        assert res == None
-
-    def test_util_check_pattern(self):
-        c = "http://example.com"
-        with pytest.raises(SubjectTypeError):
-            util.check_pattern((c, self.p, self.o))
-        with pytest.raises(PredicateTypeError):
-            util.check_pattern((self.s, c, self.o))
-        with pytest.raises(ObjectTypeError):
-            util.check_pattern((self.s, self.p, c))
-        res = util.check_pattern((self.s, self.p, self.o))
-        assert res == None