5e7a80b2d2
The current way of stepping through each comment in `Comments` is a bit weird. There is a `Vec<Comments>` and a `current` index, which is fine. The `Comments::next` method clones the current comment but doesn't advance `current`; the advancing instead happens in `print_comment`, which is where each cloned comment is actually finally used (or not, in some cases, if the comment fails to satisfy a predicate). This commit makes things more iterator-like: - `Comments::next` now advances `current` instead of `print_comment`. - `Comments::peek` is added so you can inspect a comment and check a predicate without consuming it. - This requires splitting `PrintState::comments` into immutable and mutable versions. The commit also moves the ref inside the `Option` of the return type, to save callers from having to use `as_ref`/`as_mut`. - It also requires adding `PrintState::peek_comment` alongside the existing `PrintState::next_comment`. (The lifetimes in the signature of `peek_comment` ended up more complex than I expected.) We now have a neat separation between consuming (`next`) and non-consuming (`peek`) uses of each comment. As well as being clearer, this will facilitate the next commit that avoids unnecessary cloning. |
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