scanio
RFC: https://github.com/rust-lang/rfcs/pull/3183
This crate is the testing/WIP implementation of some simple macros for generic text input scanning (to accompany the print family of macros).
This crate currently implements four macros, scan!, try_scan!, read! and try_read!.
The implementation for these macros is experimental.
scan! usage:
#[macro_use]
extern crate scanio;
fn main() {
let name: String;
let age: u8;
// reads a String into `name` and a u8 into `age`
// if it fails, it will simply assign Default::default()
scan!("{} {}", name, age);
println!("{} of age {}", name, age);
}
try_scan! usage:
#[macro_use]
extern crate scanio;
fn main() {
// returns a Result<(String, u8), ()>, which we unwrap
let person = try_scan!("{} {}", String, u8).expect("Invalid input!");
// ideally you should `match` on the result but this is an example so :shrug:
println!("{} of age {}", person.0, person.1);
}
The read! and try_read! macros work exactly the same, however their first argument must be a mutable reference to an object that implements the std::io::Read trait, such as std::io::stdin() or a File.
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