fix: decodePointer does not handle percent character (#83)

src/__tests__/decodePointer.ts

@@ -7,4 +7,7 @@ test('decodePointer', () => {
   expect(decodePointer('paths/~1users')).toEqual('paths//users');
   expect(decodePointer('paths/foo~0users')).toEqual('paths/foo~users');
   expect(decodePointer('#/foo')).toEqual('#/foo');
+  expect(decodePointer('#/foo%20%5E%20bar')).toEqual('#/foo ^ bar');
+  expect(decodePointer('#/users% ')).toEqual('#/users% ');
+  expect(decodePointer('#/users%%20%5E%')).toEqual('#/users% ^%');
 });

src/__tests__/pointerToPath.ts

@@ -8,4 +8,6 @@ test('pointerToPath', () => {
   expect(pointerToPath('#/paths/foo~0users')).toEqual(['paths', 'foo~users']);
   expect(pointerToPath('#')).toEqual([]);
   expect(pointerToPath('#/')).toEqual(['']);
+  expect(pointerToPath('#/foo%20%5E%20bar')).toEqual(['foo ^ bar']);
+  expect(pointerToPath('#/users% ')).toEqual(['users% ']);
 });

src/decodePointer.ts

@@ -1,10 +1,27 @@
 import { replaceInString } from './_utils';
 
+function safeDecodeURIComponent(value: string): string {
+  try {
+    return decodeURIComponent(value);
+  } catch {
+    return value;
+  }
+}
+
+const PERCENT_ENCODING_OCTET = /%[0-9a-f]+/gi;
+
 /**
  * Removes special json pointer characters in a value. Example:
  *
  * decodePointer('#/paths/~1users) => '#/paths//users'
  */
 export const decodePointer = (value: string): string => {
-  return replaceInString(replaceInString(decodeURIComponent('' + value), '~1', '/'), '~0', '~');
+  let decoded;
+  try {
+    decoded = decodeURIComponent(value);
+  } catch {
+    decoded = value.replace(PERCENT_ENCODING_OCTET, safeDecodeURIComponent);
+  }
+
+  return replaceInString(replaceInString(decoded, '~1', '/'), '~0', '~');
 };