html: dartium: exceptions are not wrapped

[rakudrama]

tests/html/indexeddb_3_test fails because it expects an exception of type IDBDatabaseException.

Due to the lack of re-export (bug 760), most of the dom types are wrapped to give functionally equivalent html types. Some of the DOM types are thrown. This means every method needs to be wrapped in a try-catch to ensure wrapping.

I hope 760 is resolved and implemented soon so we don't have to implement the following:

Example:

  List<String> get objectStoreNames() => _wrap(_ptr.objectStoreNames);

  void deleteObjectStore(String name) {
    _ptr.deleteObjectStore(_unwrap(name));
    return;
  }

Will have to become

  List<String> get objectStoreNames() {
    try {
      return _wrap(_ptr.objectStoreNames);
    } catch (var e) {
      if (e is _DOMTypeBase) throw _wrap(e);
      throw;
    }
  }

  void deleteObjectStore(String name) {
    try {
      _ptr.deleteObjectStore(_unwrap(name));
      return;
    } catch (var e) {
      if (e is _DOMTypeBase) throw _wrap(e);
      throw;
    }
  }

I guess we could write helpers that took closures - that would shrink the code size at the expense of adding a closure allocation to every dom call:

  List<String> get objectStoreNames() => _wrap_value_and_exceptions(() => _ptr.objectStoreNames);

[rakudrama]

Marked this as being blocked by #3070, #3071, #3081, #3082, #3083.

[vsmenon]

Invalid now that dart:html is not wrapping dart:dom.

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Added Invalid label.
Marked this as being blocked by #760, #3070, #3071, #3081, #3082, #3083.
Unmarked this as being blocked by #760, #3070, #3071, #3081, #3082, #3083.