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use super::{Error, ImplArgs, ImplTrait, Result};
use crate::SimplePath;
use proc_macro2::TokenStream as Toks;
use quote::quote;
use syn::{ItemStruct, PathArguments};
pub struct ImplBorrow;
impl ImplTrait for ImplBorrow {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "borrow", "Borrow"])
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, item: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(field) = args.using_field(&item.fields) {
let ty = field.ty.clone();
let member = args.using_member().unwrap();
let method = quote! {
fn borrow(&self) -> & #ty {
&self.#member
}
};
Ok((quote! { ::core::borrow::Borrow<#ty> }, method))
} else {
Err(Error::RequireUsing)
}
}
}
pub struct ImplBorrowMut;
impl ImplTrait for ImplBorrowMut {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "borrow", "BorrowMut"])
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, item: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(field) = args.using_field(&item.fields) {
let ty = field.ty.clone();
let member = args.using_member().unwrap();
let method = quote! {
fn borrow_mut(&mut self) -> &mut #ty {
&mut self.#member
}
};
Ok((quote! { ::core::borrow::BorrowMut<#ty> }, method))
} else {
Err(Error::RequireUsing)
}
}
}
pub struct ImplAsRef;
impl ImplTrait for ImplAsRef {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "convert", "AsRef"])
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, item: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(field) = args.using_field(&item.fields) {
let ty = field.ty.clone();
let member = args.using_member().unwrap();
let method = quote! {
fn as_ref(&self) -> & #ty {
&self.#member
}
};
Ok((quote! { ::core::convert::AsRef<#ty> }, method))
} else {
Err(Error::RequireUsing)
}
}
}
pub struct ImplAsMut;
impl ImplTrait for ImplAsMut {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "convert", "AsMut"])
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, item: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(field) = args.using_field(&item.fields) {
let ty = field.ty.clone();
let member = args.using_member().unwrap();
let method = quote! {
fn as_mut(&mut self) -> &mut #ty {
&mut self.#member
}
};
Ok((quote! { ::core::convert::AsMut<#ty> }, method))
} else {
Err(Error::RequireUsing)
}
}
}
pub struct ImplDeref;
impl ImplTrait for ImplDeref {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "ops", "Deref"])
}
fn support_path_arguments(&self) -> bool {
true
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, item: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(field) = args.using_field(&item.fields) {
let target = match args.path_arguments {
PathArguments::None => field.ty.clone(),
PathArguments::AngleBracketed(syn::AngleBracketedGenericArguments {
ref args,
..
}) => {
let mut result = None;
for arg in args {
if let syn::GenericArgument::Binding(b) = arg {
if b.ident == "Target" && result.is_none() {
result = Some(b.ty.clone());
continue;
}
}
return Err(Error::PathArguments("expected `<Target = ..>`"));
}
match result {
Some(r) => r,
None => return Err(Error::PathArguments("expected `<Target = ..>`")),
}
}
PathArguments::Parenthesized(_) => return Err(Error::PathArguments("unexpected")),
};
let member = args.using_member().unwrap();
let method = quote! {
type Target = #target;
fn deref(&self) -> &Self::Target {
&self.#member
}
};
Ok((quote! { ::core::ops::Deref }, method))
} else {
Err(Error::RequireUsing)
}
}
}
pub struct ImplDerefMut;
impl ImplTrait for ImplDerefMut {
fn path(&self) -> SimplePath {
SimplePath::new(&["", "core", "ops", "DerefMut"])
}
fn support_using(&self) -> bool {
true
}
fn struct_items(&self, _: &ItemStruct, args: &ImplArgs) -> Result<(Toks, Toks)> {
if let Some(member) = args.using_member() {
let method = quote! {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.#member
}
};
Ok((quote! { ::core::ops::DerefMut }, method))
} else {
Err(Error::RequireUsing)
}
}
}