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use ress::prelude::*;

/// 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<'a> {
    fn handle_comment(&mut self, comment: Item<Token<&'a str>>);
}
/// The default comment handler,
/// this will discard comments
/// provided to it
pub struct DefaultCommentHandler;

impl<'a> CommentHandler<'a> for DefaultCommentHandler {
    fn handle_comment(&mut self, _: Item<Token<&'a str>>) {}
}

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