From 501298a4ff5c48320d6fbecc9649dd83a4584ebd Mon Sep 17 00:00:00 2001
From: Ludo Visser <ludo.visser@gmail.com>
Date: Sun, 12 Sep 2021 22:32:21 +0200
Subject: [PATCH 1/2] Provide utility function to override $schema

---
 jsonschema/validators.py | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/jsonschema/validators.py b/jsonschema/validators.py
index 70d46c2fd..f84c508eb 100644
--- a/jsonschema/validators.py
+++ b/jsonschema/validators.py
@@ -3,6 +3,7 @@
 """
 from collections.abc import Sequence
 from functools import lru_cache
+from re import A
 from urllib.parse import unquote, urldefrag, urljoin, urlsplit
 from urllib.request import urlopen
 from warnings import warn
@@ -810,3 +811,35 @@ def validator_for(schema, default=_LATEST_VERSION):
             stacklevel=2,
         )
     return meta_schemas.get(schema[u"$schema"], _LATEST_VERSION)
+
+
+def set_validator_for(schema, validator, meta_schema_id=None):
+    """
+    Register a validator class for the given schema.
+
+    Uses the `$schema` property of the given schema as key in the validator
+    lookup table, unless `meta_schema_id` is given to override this.
+
+    This method allows you to set a validator for a particular schema in cases
+    where automatic lookup fails, for example when a schema specificies a
+    `$schema` that is not resolvable.
+
+    Arguments:
+
+        schema (collections.abc.Mapping):
+
+            the schema to register a validator for
+
+        validator:
+
+            the validator to use for this schema
+
+        meta_schema_id:
+
+            if not `None`, the given value is used as key in the lookup table.
+    """
+    if meta_schema_id is None:
+        meta_schema_id = schema.get(u"$schema", u"")
+
+    if meta_schema_id:
+        meta_schemas[meta_schema_id] = validator

From a4d6fb977dd8a07b27d0b1dd3aed4486a57e5f20 Mon Sep 17 00:00:00 2001
From: Ludo Visser <ludo.visser@gmail.com>
Date: Sun, 12 Sep 2021 22:40:38 +0200
Subject: [PATCH 2/2] Remove accidentally added import.

---
 jsonschema/validators.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/jsonschema/validators.py b/jsonschema/validators.py
index f84c508eb..be36c14aa 100644
--- a/jsonschema/validators.py
+++ b/jsonschema/validators.py
@@ -3,7 +3,6 @@
 """
 from collections.abc import Sequence
 from functools import lru_cache
-from re import A
 from urllib.parse import unquote, urldefrag, urljoin, urlsplit
 from urllib.request import urlopen
 from warnings import warn