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use std::io::{Result, Write};

pub trait Parsable<'a>: Sized {
    fn parse(s: &'a str) -> Option<(Self, usize)>;
}

pub trait Serializable {
    fn dump<W: Write>(&self, fp: W) -> Result<()>;
}

impl<A: Serializable, B: Serializable> Serializable for (A, B) {
    fn dump<W: Write>(&self, mut fp: W) -> Result<()> {
        self.0.dump(&mut fp)?;
        write!(fp, "|")?;
        self.1.dump(&mut fp)
    }
}