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// Copyright 2024 Gabriel Bjørnager Jensen.
//
// This file is part of bZipper.
//
// bZipper is free software: you can redistribute
// it and/or modify it under the terms of the GNU
// Lesser General Public License as published by
// the Free Software Foundation, either version 3
// of the License, or (at your option) any later
// version.
//
// bZipper is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without
// even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Less-
// er General Public License along with bZipper. If
// not, see <https://www.gnu.org/licenses/>.
use proc_macro2::TokenStream;
use quote::ToTokens;
use std::fmt;
use std::fmt::{Debug, Formatter};
use syn::{
GenericParam,
Generics,
Ident,
Lifetime,
Token,
punctuated::Punctuated,
};
/// A name of a genric.
#[derive(Clone)]
pub enum GenericName {
/// Denotes a generic constant.
Const(Ident),
/// Denotes a generic lifetime.
Lifetime(Lifetime),
/// Denotes a generic type.
Ty(Ident),
}
impl GenericName {
/// Extracts the names of the given generics.
#[must_use]
pub fn extract_from(generics: &Generics) -> Punctuated<Self, Token![,]> {
let mut names = Punctuated::new();
for generic in &generics.params {
let name = match *generic {
GenericParam::Const( ref param) => Self::Const( param.ident.clone()),
GenericParam::Lifetime(ref param) => Self::Lifetime(param.lifetime.clone()),
GenericParam::Type( ref param) => Self::Ty( param.ident.clone()),
};
names.push(name);
}
names
}
}
impl Debug for GenericName {
#[inline]
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let ident = match *self {
| Self::Const(ref ident)
| Self::Lifetime(Lifetime { ref ident, .. })
| Self::Ty(ref ident)
=> ident,
};
Debug::fmt(ident, f)
}
}
impl ToTokens for GenericName {
#[inline(always)]
fn to_tokens(&self, tokens: &mut TokenStream) {
use GenericName::*;
match *self {
| Const(ref ident)
| Ty( ref ident)
=> ident.to_tokens(tokens),
Lifetime(ref lifetime) => lifetime.to_tokens(tokens),
}
}
}
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