Skip to content

Support multiple #[related] in derive macro #374

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
zakarumych wants to merge 1 commit into
base: main
Choose a base branch
from
+30 −10
Open

Support multiple #[related] in derive macro #374

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
40 changes: 30 additions & 10 deletions miette-derive/src/related.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use crate::{
utils::{display_pat_members, gen_all_variants_with},
};

pub struct Related(syn::Member);
pub struct Related(Vec<syn::Member>);

impl Related {
pub(crate) fn from_fields(fields: &syn::Fields) -> syn::Result<Option<Self>> {
Expand All @@ -22,6 +22,7 @@ impl Related {
}

fn from_fields_vec(fields: Vec<&syn::Field>) -> syn::Result<Option<Self>> {
let mut members = Vec::new();
for (i, field) in fields.iter().enumerate() {
for attr in &field.attrs {
if attr.path().is_ident("related") {
Expand All @@ -33,11 +34,17 @@ impl Related {
span: field.span(),
})
};
return Ok(Some(Related(related)));

members.push(related);
}
}
}
Ok(None)

if members.is_empty() {
return Ok(None);
}

Ok(Some(Self(members)))
}

pub(crate) fn gen_enum(variants: &[DiagnosticDef]) -> Option<TokenStream> {
Expand All @@ -47,16 +54,24 @@ impl Related {
|ident, fields, DiagnosticConcreteArgs { related, .. }| {
let (display_pat, _display_members) = display_pat_members(fields);
related.as_ref().map(|related| {
let rel = match &related.0 {
syn::Member::Named(ident) => ident.clone(),
syn::Member::Unnamed(syn::Index { index, .. }) => {
format_ident!("_{}", index)
assert_ne!(related.0.len(), 0);

let mut rels = related.0.iter().map(|rel| {
match rel {
syn::Member::Named(ident) => ident.clone(),
syn::Member::Unnamed(syn::Index { index, .. }) => {
format_ident!("_{}", index)
}
}
};
});

let rel = rels.next().unwrap();

quote! {
Self::#ident #display_pat => {
std::option::Option::Some(std::boxed::Box::new(
#rel.iter().map(|x| -> &(dyn miette::Diagnostic) { &*x })
#(.chain(#rels.iter().map(|x| -> &(dyn miette::Diagnostic) { &*x })))*
))
}
}
Expand All @@ -66,12 +81,17 @@ impl Related {
}

pub(crate) fn gen_struct(&self) -> Option<TokenStream> {
let rel = &self.0;
assert_ne!(self.0.len(), 0);

let rel = &self.0[0];
let rels = &self.0[1..];

Some(quote! {
fn related<'a>(&'a self) -> std::option::Option<std::boxed::Box<dyn std::iter::Iterator<Item = &'a dyn miette::Diagnostic> + 'a>> {
use ::core::borrow::Borrow;
std::option::Option::Some(std::boxed::Box::new(
self.#rel.iter().map(|x| -> &(dyn miette::Diagnostic) { &*x.borrow() })
self.#rel.iter().map(|x| -> &(dyn miette::Diagnostic) { &*x.borrow() })
#(.chain(self.#rels.iter().map(|x| -> &(dyn miette::Diagnostic) { &*x.borrow() })))*
))
}
})
Expand Down