kalix 0.1.0

Declarative Kalman filtering from dynamics expressions. Write the physics, derive the filter.
Documentation 
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#[cfg(test)]
mod tests {
    use kalix::expr::ast::Expr;
    use kalix::expr::parser::parse;

    #[test]
    fn test_literal() {
        assert_eq!(parse("3.14"), Ok(Expr::Lit(3.14)));
    }

    #[test]
    fn test_variable() {
        assert_eq!(parse("vel"), Ok(Expr::Var("vel".to_string())));
    }

    #[test]
    fn test_addition() {
        assert_eq!(
            parse("pos + vel"),
            Ok(Expr::add(Expr::var("pos"), Expr::var("vel")))
        );
    }

    #[test]
    fn test_multiplication() {
        assert_eq!(
            parse("vel * dt"),
            Ok(Expr::mul(Expr::var("vel"), Expr::var("dt")))
        );
    }

    #[test]
    fn test_integer_power() {
        assert_eq!(parse("dt^2"), Ok(Expr::pow(Expr::var("dt"), 2)));
    }

    #[test]
    fn test_complex_expression_parses() {
        let result = parse("pos + vel*dt + 0.5*acc*dt^2");
        assert!(result.is_ok(), "Expected OK, got {:?}", result);
    }

    #[test]
    fn test_unsupported_trig() {
        assert!(parse("sin(pos)").is_err());
    }

    #[test]
    fn test_division_by_variable_disallowed() {
        let result = parse("pos / vel");
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("division"));
    }
}