educe/trait_handlers/ord/
mod.rs

1mod models;
2mod ord_enum;
3mod ord_struct;
4mod panic;
5
6use quote::quote;
7use syn::{Data, DeriveInput, Meta};
8
9use super::TraitHandler;
10use crate::Trait;
11
12pub(crate) struct OrdHandler;
13
14impl TraitHandler for OrdHandler {
15    #[inline]
16    fn trait_meta_handler(
17        ast: &DeriveInput,
18        token_stream: &mut proc_macro2::TokenStream,
19        traits: &[Trait],
20        meta: &Meta,
21    ) -> syn::Result<()> {
22        match ast.data {
23            Data::Struct(_) => {
24                ord_struct::OrdStructHandler::trait_meta_handler(ast, token_stream, traits, meta)
25            },
26            Data::Enum(_) => {
27                ord_enum::OrdEnumHandler::trait_meta_handler(ast, token_stream, traits, meta)
28            },
29            Data::Union(_) => {
30                Err(crate::panic::trait_not_support_union(meta.path().get_ident().unwrap()))
31            },
32        }
33    }
34}
35
36fn supertraits(#[allow(unused_variables)] traits: &[Trait]) -> Vec<proc_macro2::TokenStream> {
37    let mut supertraits = vec![];
38    supertraits.push(quote! {::core::cmp::Eq});
39
40    // We mustn't add the PartialOrd bound to the educed PartialOrd impl.
41    // When we're educing PartialOrd we can leave it off the Ord impl too,
42    // since we *know* Self is going to be PartialOrd.
43    #[cfg(feature = "PartialOrd")]
44    if !traits.contains(&Trait::PartialOrd) {
45        supertraits.push(quote! {::core::cmp::PartialOrd});
46    };
47
48    supertraits
49}
educe/trait_handlers/ord/mod.rs

educe/trait_handlers/ord/
mod.rs
