balsa 0.3.2

Reference implementation for the Balsa molecular line notation.
Documentation 
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use lyn::{Action, Scanner};

use crate::feature::Shortcut;

pub fn shortcut(scanner: &mut Scanner) -> Result<Option<Shortcut>, lyn::Error> {
    scanner.scan(|symbol| match symbol {
        "B" => Some(Action::Request(Shortcut::B)),
        "Br" => Some(Action::Return(Shortcut::Br)),
        "C" => Some(Action::Request(Shortcut::C)),
        "Cl" => Some(Action::Return(Shortcut::Cl)),
        "N" => Some(Action::Return(Shortcut::N)),
        "O" => Some(Action::Return(Shortcut::O)),
        "F" => Some(Action::Return(Shortcut::F)),
        "I" => Some(Action::Return(Shortcut::I)),
        "P" => Some(Action::Return(Shortcut::P)),
        "S" => Some(Action::Return(Shortcut::S)),
        _ => None,
    })
}

#[cfg(test)]
mod tests {
    use super::*;
    use pretty_assertions::assert_eq;

    #[test]
    fn unexpected() {
        let mut scanner = Scanner::new("x");

        assert_eq!(shortcut(&mut scanner), Ok(None))
    }

    #[test]
    fn expected_unexpected_ok() {
        let mut scanner = Scanner::new("Cx");

        assert_eq!(shortcut(&mut scanner), Ok(Some(Shortcut::C)))
    }

    #[test]
    fn expected_expected_ok() {
        let mut scanner = Scanner::new("Cl");

        assert_eq!(shortcut(&mut scanner), Ok(Some(Shortcut::Cl)))
    }
}