1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

// quote! macro needs a higher recursion limit
#![recursion_limit = "512"]
#![forbid(
    future_incompatible,
    macro_use_extern_crate,
    missing_copy_implementations,
    missing_debug_implementations,
    nonstandard_style,
    rust_2018_compatibility,
    trivial_casts,
    trivial_numeric_casts,
    unsafe_code,
    variant_size_differences
)]
#![warn(
    rust_2018_idioms,
    single_use_lifetimes,
    unused_import_braces,
    unused_lifetimes,
    unused_qualifications,
    unused_results,
    unused
)]

use crate::machine::Machine;
use proc_macro::TokenStream;
use quote::quote;
use syn::parse_macro_input;

mod event;
mod initial_state;
mod machine;
mod state;
mod state_transition;
mod transition;

/// Generate the declaratively described state machine diagram.
#[proc_macro]
pub fn state_machine(input: TokenStream) -> TokenStream {
    let machines: Machine = parse_macro_input!(input as Machine);

    quote!(#machines).into()
}