Method _get_illegal_split_indices

src/black/trans.py:1788–1797

(self, string: str)

        yield from iter_fexpr_spans(string)

    def _get_illegal_split_indices(self, string: str) -> set[Index]:
        illegal_indices: set[Index] = set()
        iterators = [
            self._iter_fexpr_slices(string),
            self._iter_nameescape_slices(string),
        ]
        for it in iterators:
            for begin, end in it:
                illegal_indices.update(range(begin, end))
        return illegal_indices

    def _get_break_idx(self, string: str, max_break_idx: int) -> int | None:
        """