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|
use proc_macro2::{Span, TokenStream};
use quote::ToTokens;
use syn::parse::{Error, Parse, ParseStream, Result};
use syn::token::Brace;
use syn::{Attribute, Generics, ImplItem, ItemImpl, Path, Token, Type};
#[derive(Clone)]
pub struct TraitImpl {
pub attrs: Vec<Attribute>,
pub defaultness: Option<Token![default]>,
pub unsafety: Option<Token![unsafe]>,
pub impl_token: Token![impl],
pub generics: Generics,
pub trait_: Path,
pub for_token: Token![for],
pub self_ty: Type,
pub brace_token: Brace,
pub items: Vec<ImplItem>,
}
impl Parse for TraitImpl {
fn parse(input: ParseStream) -> Result<Self> {
let imp: ItemImpl = input.parse()?;
let (trait_, for_token) = match imp.trait_ {
Some((_bang_token, trait_, for_token)) => (trait_, for_token),
None => {
return Err(Error::new(
Span::call_site(),
"must be placed on a trait impl",
))
}
};
Ok(TraitImpl {
attrs: imp.attrs,
defaultness: imp.defaultness,
unsafety: imp.unsafety,
impl_token: imp.impl_token,
generics: imp.generics,
trait_,
for_token,
self_ty: *imp.self_ty,
brace_token: imp.brace_token,
items: imp.items,
})
}
}
impl ToTokens for TraitImpl {
fn to_tokens(&self, tokens: &mut TokenStream) {
let imp = self.clone();
ItemImpl::to_tokens(
&ItemImpl {
attrs: imp.attrs,
defaultness: imp.defaultness,
unsafety: imp.unsafety,
impl_token: imp.impl_token,
generics: imp.generics,
trait_: Some((None, imp.trait_, imp.for_token)),
self_ty: Box::new(imp.self_ty),
brace_token: imp.brace_token,
items: imp.items,
},
tokens,
);
}
}
|
