Eyes

A simpler way to parse using human-readable templates

Eyes was made for the primary purpose of parsing challenge inputs for Advent of Code challenges.

It currently provides limited functionality, but more options may be added provided they are useful additions for parsing slightly more complicated formats.

Eyes does not have any dependencies, as I wanted to keep it simple to and lightweight in design. Good performance is not guaranteed, as the library isn't well tested yet.

I was told this functionality is similar to scanf from C.

Examples:

let input = "#lol @ 338,7643: 20.2x24.5";
let template = "#{} @ {},{}: {}x{}";

println!("input: '{}'", input);
println!("pattern: '{}'", template);

let (id, x, y, w, h) = parse!(input, template, String, isize, isize, f64, f64);

println!("id: {:?}", id);
println!("x: {:?}", x);
println!("y: {:?}", y);
println!("w: {:?}", w);
println!("h: {:?}", h);

assert_eq!((id.as_str(), x, y, w, h), ("lol", 338, 7643, 20.2, 24.5));

Eyes will try to expand its captures, so that the following example also works as expected:

let input = "turn off 660,55 through 986,197";
let template = "{} {},{} through {},{}";

println!("input: '{}'", input);
println!("pattern: '{}'", template);

let (op, x1, y1, x2, y2) = try_parse!(input, template, String, usize, usize, usize, usize);

println!("op: {:?}", op);
println!("p1: {:?}", (&x1, &y1));
println!("p2: {:?}", (&x2, &y2));

assert_eq!(
    (op.unwrap().as_str(), x1, y1, x2, y2),
    ("turn off", Ok(660), Ok(55), Ok(986), Ok(197))
);