Macro program 

macro_rules! program {
    {
        $(#[default_state($ds:expr)])?
        rules: {$(($state:expr, $symbol:expr) -> $direction:ident($next:expr, $write:expr)),* $(,)?} $(;)?
    } => { ... };
}

The [program!] macro facilitates the creation of new Program instances using familiar syntax

program! {
    #[default_state(initial_state)] // optional
    rules: {(state, symbol) -> direction(next_state, write_symbol); ...};
}

Basic Usage

The following example demonstrates the usage of the macro to create a program using three states {-1, 0, 1} and two symbols {0, 1}.

let rule = rstm_core::program! {
    #[default_state(0)]
    rules: {
        (0, 0) -> Right(1, 1),
        (0, 1) -> Left(-1, 0),
        (1, 0) -> Right(1, 1),
        (1, 1) -> Left(-1, 1),
        (-1, 0) -> Right(0, 0),
        (-1, 1) -> Left(0, 1),
    };
};