pleme_closedaxis_derive/
lib.rs

1//!GENERATED by tatara-rust-derive::EnumFoldDeriveSpec.
2//!Do not hand-edit; regenerate from the (defenum-fold …) source.
3use proc_macro::TokenStream;
4use quote::quote;
5use syn::{Data, DataEnum, DeriveInput, Fields, parse_macro_input};
6#[proc_macro_derive(ClosedAxis)]
7pub fn derive_closed_axis(input: TokenStream) -> TokenStream {
8    let input = parse_macro_input!(input as DeriveInput);
9    let self_name = &input.ident;
10    let de = match &input.data {
11        Data::Enum(de) => de,
12        _ => {
13            return syn::Error::new_spanned(self_name, "EnumFoldDerive requires an enum")
14                .to_compile_error()
15                .into();
16        }
17    };
18    for v in &de.variants {
19        if !matches!(v.fields, Fields::Unit) {
20            return syn::Error::new_spanned(
21                    &v.ident,
22                    "EnumFoldDerive (unit-only) requires all variants be unit variants",
23                )
24                .to_compile_error()
25                .into();
26        }
27    }
28    let fold_count = de.variants.len();
29    let fold_count_lit = proc_macro2::Literal::usize_unsuffixed(fold_count);
30    let _ = fold_count_lit.clone();
31    let fragments: Vec<_> = de
32        .variants
33        .iter()
34        .map(|v| {
35            let variant_name = &v.ident;
36            let variant_str = variant_name.to_string();
37            quote! {
38                Self::# variant_name
39            }
40        })
41        .collect();
42    let _ = &fragments;
43    let expanded = quote! {
44        impl # self_name { pub const ALL : &'static [Self] = & [# (# fragments),*]; }
45        impl ::shikumi::ClosedAxis for # self_name { const ALL : &'static [Self] = & [#
46        (# fragments),*]; }
47    };
48    TokenStream::from(expanded)
49}
pleme_closedaxis_derive/lib.rs

pleme_closedaxis_derive/
lib.rs
