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use crate::syntax::instantiate::NamedImplKey;
use crate::syntax::resolve::Resolution;
use crate::syntax::{Impl, Lifetimes};
use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{Lifetime, Token};
pub struct ImplGenerics<'a> {
explicit_impl: Option<&'a Impl>,
resolve: Resolution<'a>,
}
pub struct TyGenerics<'a> {
key: NamedImplKey<'a>,
explicit_impl: Option<&'a Impl>,
resolve: Resolution<'a>,
}
pub fn split_for_impl<'a>(
key: NamedImplKey<'a>,
explicit_impl: Option<&'a Impl>,
resolve: Resolution<'a>,
) -> (ImplGenerics<'a>, TyGenerics<'a>) {
let impl_generics = ImplGenerics {
explicit_impl,
resolve,
};
let ty_generics = TyGenerics {
key,
explicit_impl,
resolve,
};
(impl_generics, ty_generics)
}
impl<'a> ToTokens for ImplGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if let Some(imp) = self.explicit_impl {
imp.impl_generics.to_tokens(tokens);
} else {
self.resolve.generics.to_tokens(tokens);
}
}
}
impl<'a> ToTokens for TyGenerics<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
if let Some(imp) = self.explicit_impl {
imp.ty_generics.to_tokens(tokens);
} else if !self.resolve.generics.lifetimes.is_empty() {
let span = self.key.rust.span();
self.key
.lt_token
.unwrap_or_else(|| Token)
.to_tokens(tokens);
self.resolve.generics.lifetimes.to_tokens(tokens);
self.key
.gt_token
.unwrap_or_else(|| Token)
.to_tokens(tokens);
}
}
}
pub struct UnderscoreLifetimes<'a> {
generics: &'a Lifetimes,
}
impl Lifetimes {
pub fn to_underscore_lifetimes(&self) -> UnderscoreLifetimes {
UnderscoreLifetimes { generics: self }
}
}
impl<'a> ToTokens for UnderscoreLifetimes<'a> {
fn to_tokens(&self, tokens: &mut TokenStream) {
let Lifetimes {
lt_token,
lifetimes,
gt_token,
} = self.generics;
lt_token.to_tokens(tokens);
for pair in lifetimes.pairs() {
let (lifetime, punct) = pair.into_tuple();
let lifetime = Lifetime::new("'_", lifetime.span());
lifetime.to_tokens(tokens);
punct.to_tokens(tokens);
}
gt_token.to_tokens(tokens);
}
}
|
