mapper-impl 1.1.2

Implementation detail of the `mapper` crate
Documentation 
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use syn::{
    parse::{Parse, ParseStream},
    punctuated::Punctuated,
    token::Token,
    Result,
};

pub trait PunctuatedExtensions<T: Parse, P: Token + Parse> {
    fn parse_separated_nonempty_until(
        input: ParseStream,
        stop_predicate: fn(ParseStream) -> bool,
    ) -> Result<Self>
    where
        Self: Sized;
}

impl<T: Parse, P: Token + Parse> PunctuatedExtensions<T, P> for Punctuated<T, P> {
    fn parse_separated_nonempty_until(
        input: ParseStream,
        stop_predicate: fn(ParseStream) -> bool,
    ) -> Result<Self> {
        let mut punctuated = Punctuated::new();
        loop {
            if stop_predicate(input) {
                break;
            }
            let value = T::parse(input)?;
            punctuated.push_value(value);
            if !P::peek(input.cursor()) {
                break;
            }
            let punctuation = input.parse()?;
            punctuated.push_punct(punctuation);
        }
        Ok(punctuated)
    }
}