forked from Peternator7/strum
/
enum_variant_names.rs
36 lines (30 loc) · 1.04 KB
/
enum_variant_names.rs
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use proc_macro2::TokenStream;
use syn;
use crate::helpers::{case_style::CaseStyle, extract_meta, CaseStyleHelpers, MetaIteratorHelpers};
pub fn enum_variant_names_inner(ast: &syn::DeriveInput) -> TokenStream {
let name = &ast.ident;
let variants = match ast.data {
syn::Data::Enum(ref v) => &v.variants,
_ => panic!("EnumVariantNames only works on Enums"),
};
// Derives for the generated enum
let type_meta = extract_meta(&ast.attrs);
let case_style = type_meta
.find_unique_property("strum", "serialize_all")
.map(|style| CaseStyle::from(style.as_ref()));
let names = variants
.iter()
.map(|v| v.ident.convert_case(case_style))
.collect::<Vec<_>>();
quote! {
impl VariantNames for #name {
/// Return a slice containing the names of the variants of this enum
#[allow(dead_code)]
fn variants() -> &'static [&'static str] {
&[
#(#names),*
]
}
}
}
}