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|
use proc_macro2::{Span, TokenStream};
use quote::{quote, quote_spanned};
use syn::spanned::Spanned;
use syn::{DeriveInput, Generics, Path, Type};
use crate::internal::attrs::Default;
use crate::internal::inputs::RemoteInput;
use crate::internal::{attrs, Container, Context, Data, Field, Remote, Style, Variant};
pub fn expand_nix_serialize(crate_path: Path, input: &mut DeriveInput) -> syn::Result<TokenStream> {
let cx = Context::new();
let cont = Container::from_ast(&cx, crate_path, input);
cx.check()?;
let cont = cont.unwrap();
let ty = cont.ident_type();
let body = nix_serialize_body(&cont);
let crate_path = cont.crate_path();
Ok(nix_serialize_impl(
crate_path,
&ty,
&cont.original.generics,
body,
))
}
pub fn expand_nix_serialize_remote(
crate_path: Path,
input: &RemoteInput,
) -> syn::Result<TokenStream> {
let cx = Context::new();
let remote = Remote::from_ast(&cx, crate_path, input);
if let Some(attrs) = remote.as_ref().map(|r| &r.attrs) {
if attrs.display.is_none() && attrs.type_into.is_none() && attrs.type_try_into.is_none() {
cx.error_spanned(input, "Missing into, try_into or display attribute");
}
}
cx.check()?;
let remote = remote.unwrap();
let crate_path = remote.crate_path();
let body = nix_serialize_body_into(crate_path, &remote.attrs).expect("From tokenstream");
let generics = Generics::default();
Ok(nix_serialize_impl(crate_path, remote.ty, &generics, body))
}
fn nix_serialize_impl(
crate_path: &Path,
ty: &Type,
generics: &Generics,
body: TokenStream,
) -> TokenStream {
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
quote! {
#[automatically_derived]
impl #impl_generics #crate_path::wire::ser::NixSerialize for #ty #ty_generics
#where_clause
{
async fn serialize<W>(&self, writer: &mut W) -> std::result::Result<(), W::Error>
where W: #crate_path::wire::ser::NixWrite
{
use #crate_path::wire::ser::Error as _;
#body
}
}
}
}
fn nix_serialize_body_into(
crate_path: &syn::Path,
attrs: &attrs::Container,
) -> Option<TokenStream> {
if let Default::Default(span) = &attrs.display {
Some(nix_serialize_display(span.span()))
} else if let Default::Path(path) = &attrs.display {
Some(nix_serialize_display_path(path))
} else if let Some(type_into) = attrs.type_into.as_ref() {
Some(nix_serialize_into(type_into))
} else {
attrs
.type_try_into
.as_ref()
.map(|type_try_into| nix_serialize_try_into(crate_path, type_try_into))
}
}
fn nix_serialize_body(cont: &Container) -> TokenStream {
if let Some(tokens) = nix_serialize_body_into(cont.crate_path(), &cont.attrs) {
tokens
} else {
match &cont.data {
Data::Struct(_style, fields) => nix_serialize_struct(fields),
Data::Enum(variants) => nix_serialize_enum(variants),
}
}
}
fn nix_serialize_struct(fields: &[Field<'_>]) -> TokenStream {
let write_fields = fields.iter().map(|f| {
let field = &f.member;
let ty = f.ty;
let write_value = quote_spanned! {
ty.span()=> writer.write_value(&self.#field).await?
};
if let Some(version) = f.attrs.version.as_ref() {
quote! {
if (#version).contains(&writer.version().minor()) {
#write_value;
}
}
} else {
quote! {
#write_value;
}
}
});
quote! {
#(#write_fields)*
Ok(())
}
}
fn nix_serialize_variant(variant: &Variant<'_>) -> TokenStream {
let ident = variant.ident;
let write_fields = variant.fields.iter().map(|f| {
let field = f.var_ident();
let ty = f.ty;
let write_value = quote_spanned! {
ty.span()=> writer.write_value(#field).await?
};
if let Some(version) = f.attrs.version.as_ref() {
quote! {
if (#version).contains(&writer.version().minor()) {
#write_value;
}
}
} else {
quote! {
#write_value;
}
}
});
let field_names = variant.fields.iter().map(|f| f.var_ident());
let destructure = match variant.style {
Style::Struct => {
quote! {
Self::#ident { #(#field_names),* }
}
}
Style::Tuple => {
quote! {
Self::#ident(#(#field_names),*)
}
}
Style::Unit => quote!(Self::#ident),
};
let ignore = match variant.style {
Style::Struct => {
quote! {
Self::#ident { .. }
}
}
Style::Tuple => {
quote! {
Self::#ident(_, ..)
}
}
Style::Unit => quote!(Self::#ident),
};
let version = &variant.attrs.version;
quote! {
#destructure if (#version).contains(&writer.version().minor()) => {
#(#write_fields)*
}
#ignore => {
return Err(W::Error::invalid_enum(format!("{} is not valid for version {}", stringify!(#ident), writer.version())));
}
}
}
fn nix_serialize_enum(variants: &[Variant<'_>]) -> TokenStream {
let match_variant = variants
.iter()
.map(|variant| nix_serialize_variant(variant));
quote! {
match self {
#(#match_variant)*
}
Ok(())
}
}
fn nix_serialize_into(ty: &Type) -> TokenStream {
quote_spanned! {
ty.span() =>
{
let other : #ty = <Self as Clone>::clone(self).into();
writer.write_value(&other).await
}
}
}
fn nix_serialize_try_into(crate_path: &Path, ty: &Type) -> TokenStream {
quote_spanned! {
ty.span() =>
{
use #crate_path::wire::ser::Error;
let other : #ty = <Self as Clone>::clone(self).try_into().map_err(Error::unsupported_data)?;
writer.write_value(&other).await
}
}
}
fn nix_serialize_display(span: Span) -> TokenStream {
quote_spanned! {
span => writer.write_display(self).await
}
}
fn nix_serialize_display_path(path: &syn::ExprPath) -> TokenStream {
quote_spanned! {
path.span() => writer.write_display(#path(self)).await
}
}
|
