Macro requirements

macro_rules! requirements {
    ([$($requirement:ident),* $(,)?] $(,)?) => { ... };
    ($error:ty, [$($requirement:ident),* $(,)?] $(,)?) => { ... };
}

Available on crate feature require only.

Check multiple requirement!s

Example

use swift_check::{
    require::{Requirement, check},
    requirement, requirements,
    eq
};

requirement!(pub space => eq(b' ') =>! "There needs to be a space!");
requirement!(pub seven => eq(b'7') =>! "There needs to be a seven!");

let (valid, res) = check(
    b"example input 7",
    requirements!([space, seven])
).results();

// The first element of result denotes if all bytes met at least one of the conditions, in this
// case this is false.
assert!(!valid);

// the res is an iterator over each requirement! result. You also can use `result` instead of
// `results` if you only need to know all requirements were met and care less about granular
// error reporting.

Error Handling

The individual requirements do not need to share the same error type, but they do all need to implement either From or Into the requirements! error type.

Syntax

Error Type, [Requirements, ...]

or for when you’re feeling lazy, the default error is ErrMsg, the above example uses this.

[Requirements, ...]