1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

use ress::Item;
/// A comment handler will allow you to specify
/// behavior about what to do with comments
/// officially comments are supposed to operate
/// the same as whitespace so the default behavior
/// would be to throw away any comments found
pub trait CommentHandler {
    fn handle_comment(&mut self, comment: Item);
}
/// The default comment handler,
/// this will discard comments
/// provided to it
pub struct DefaultCommentHandler;

impl CommentHandler for DefaultCommentHandler {
    fn handle_comment(&mut self, _: Item) {}
}

impl<F> CommentHandler for F
where F: FnMut(Item)
{
    fn handle_comment(&mut self, item: Item) {
        self(item)
    }
}