Add support for the relative-json-pointer format

Author: jdesrosiers

formats/formats-test-suite.spec.ts

@@ -49,11 +49,6 @@ const skip = new Set<string>([
   "|draft2019-09|idn-hostname.json",
   "|draft7|idn-hostname.json",
 
-  // Not supported
-  "|draft2020-12|relative-json-pointer.json",
-  "|draft2019-09|relative-json-pointer.json",
-  "|draft7|relative-json-pointer.json",
-
   // Leap seconds don't make sense without a date
   "|draft2020-12|time.json|validation of time strings|a valid time string with leap second, Zulu",
   "|draft2019-09|time.json|validation of time strings|a valid time string with leap second, Zulu",

formats/handlers/relative-json-pointer.js

@@ -0,0 +1,15 @@
+const unescaped = `[\\u{00}-\\u{2E}\\u{30}-\\u{7D}\\u{7F}-\\u{10FFFF}]`; // %x2F ('/') and %x7E ('~') are excluded from 'unescaped'
+const escaped = `~[01]`; // representing '~' and '/', respectively
+const referenceToken = `(?:${unescaped}|${escaped})*`;
+const jsonPointer = `(?:/${referenceToken})*`;
+
+const nonNegativeInteger = `(?:0|[1-9][0-9]*)`;
+const indexManipulation = `(?:[+-]${nonNegativeInteger})`;
+const relativeJsonPointer = `${nonNegativeInteger}(?:${indexManipulation}?${jsonPointer}|#)`;
+
+export const isRelativeJsonPointer = RegExp.prototype.test.bind(new RegExp(`^${relativeJsonPointer}$`, "u"));
+
+export default {
+  id: "https://json-schema.org/format/relative-json-pointer",
+  handler: (pointer) => typeof pointer !== "string" || isRelativeJsonPointer(pointer)
+};

formats/index.js

@@ -13,6 +13,7 @@ import iriReference from "./handlers/iri-reference.js";
 import uuid from "./handlers/uuid.js";
 import uriTemplate from "./handlers/uri-template.js";
 import jsonPointer from "./handlers/json-pointer.js";
+import relativeJsonPointer from "./handlers/relative-json-pointer.js";
 import regex from "./handlers/regex.js";
 
 
@@ -29,6 +30,7 @@ addFormat(iriReference);
 addFormat(uuid);
 addFormat(uriTemplate);
 addFormat(jsonPointer);
+addFormat(relativeJsonPointer);
 addFormat(regex);
 
 export {