servo: Merge #15649 - Rewrite the ban-type lint in Python (from zimio:issue-15591-rewrite-ban-type-lint); r=Wafflespeanut

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Rewrite the ban-type lint in Python.

Question: Should the old ban-type lint written in rust be deleted?

---
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- [x ] `./mach build -d` does not report any errors
- [x ] `./mach test-tidy` does not report any errors
- [x ] These changes fix #15591

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- [ x] There are tests for these changes

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Source-Repo: https://github.com/servo/servo
Source-Revision: 261df34ced0bdcb8126994c8653ac101d1172085

servo/python/tidy/servo_tidy/tidy.py

@@ -549,6 +549,12 @@ def check_rust(file_name, lines):
             (r": &Vec<", "use &[T] instead of &Vec<T>", no_filter),
             # No benefit over using &str
             (r": &String", "use &str instead of &String", no_filter),
+            # There should be any use of banned types:
+            # Cell<JSVal>, Cell<JS<T>>, DOMRefCell<JS<T>>, DOMRefCell<HEAP<T>>
+            (r"(\s|:)+Cell<JSVal>", "Banned type Cell<JSVal> detected. Use MutJS<JSVal> instead", no_filter),
+            (r"(\s|:)+Cell<JS<.+>>", "Banned type Cell<JS<T>> detected. Use MutJS<JS<T>> instead", no_filter),
+            (r"DOMRefCell<JS<.+>>", "Banned type DOMRefCell<JS<T>> detected. Use MutJS<JS<T>> instead", no_filter),
+            (r"DOMRefCell<Heap<.+>>", "Banned type DOMRefCell<Heap<T>> detected. Use MutJS<JS<T>> instead", no_filter),
             # No benefit to using &Root<T>
             (r": &Root<", "use &T instead of &Root<T>", no_filter),
             (r"^&&", "operators should go at the end of the first line", no_filter),