Fix annotations for unknown keywords

Author: jdesrosiers

annotations/tests/unknown.json

@@ -0,0 +1,21 @@
+[
+  {
+    "title": "`unknownKeyword` is an annotation",
+    "schema": {
+      "$schema": "https://json-schema.org/draft/2020-12/schema",
+      "unknownKeyword": "Foo"
+    },
+    "subjects": [
+      {
+        "instance": 42,
+        "assertions": [
+          {
+            "location": "#",
+            "keyword": "unknownKeyword",
+            "expected": ["Foo"]
+          }
+        ]
+      }
+    ]
+  }
+]

lib/keywords/unknown.js

@@ -1,13 +1,18 @@
 import * as Browser from "@hyperjump/browser";
 import * as Instance from "../../annotations/annotated-instance.js";
+import { pointerSegments } from "@hyperjump/json-pointer";
 
 
 const id = "https://json-schema.org/keyword/unknown";
 
-const compile = (schema) => Browser.value(schema);
+const compile = (schema) => {
+  const keywordName = [...pointerSegments(schema.cursor)].pop();
+  return [keywordName, Browser.value(schema)];
+};
 
-const interpret = (value, instance, _ast, _dynamicAnchors, _quiet, schemaLocation) => {
-  Instance.setAnnotation(instance, id, schemaLocation, value);
+const interpret = ([keywordName, value], instance, _ast, _dynamicAnchors, _quiet, schemaLocation) => {
+  const keywordId = `${id}#${keywordName}`;
+  Instance.setAnnotation(instance, keywordId, schemaLocation, value);
   return true;
 };