fosk 0.2.0

In-memory SQL-like query engine and lightweight data store for testing and prototyping.
Documentation 
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use ordered_float::NotNan;
use std::fmt::{self, Display};

#[derive(Clone, PartialEq, Eq, Hash)]
pub enum Literal {
    String(String),
    Int(i64),
    Float(NotNan<f64>),
    Bool(bool),
    Null,
}

impl Display for Literal {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Literal::String(s) => write!(f, "s: \"{}\"", s),
            Literal::Int(i) => write!(f, "i: {}", i),
            Literal::Float(n) => write!(f, "f: {}", n.into_inner()),
            Literal::Bool(b) => write!(f, "b: {}", b),
            Literal::Null => write!(f, "n: NULL"),
        }
    }
}

impl fmt::Debug for Literal {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Literal::String(_) => write!(f, "String({})", self),
            Literal::Int(_) => write!(f, "Int({})", self),
            Literal::Float(_) => write!(f, "Float({})", self),
            Literal::Bool(_) => write!(f, "Bool({})", self),
            Literal::Null => write!(f, "Null(n: NULL)"),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::Literal;
    use ordered_float::NotNan;

    #[test]
    fn display_formats_every_literal_variant() {
        let cases = [
            (Literal::String("Ada".to_string()), "s: \"Ada\""),
            (Literal::Int(42), "i: 42"),
            (Literal::Float(NotNan::new(2.5).unwrap()), "f: 2.5"),
            (Literal::Bool(true), "b: true"),
            (Literal::Null, "n: NULL"),
        ];

        for (literal, expected) in cases {
            assert_eq!(literal.to_string(), expected);
        }
    }

    #[test]
    fn debug_formats_every_literal_variant() {
        let cases = [
            (Literal::String("Ada".to_string()), "String(s: \"Ada\")"),
            (Literal::Int(42), "Int(i: 42)"),
            (Literal::Float(NotNan::new(2.5).unwrap()), "Float(f: 2.5)"),
            (Literal::Bool(false), "Bool(b: false)"),
            (Literal::Null, "Null(n: NULL)"),
        ];

        for (literal, expected) in cases {
            assert_eq!(format!("{:?}", literal), expected);
        }
    }
}