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Update to syn 2.0 #118

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Update to syn 2.0 #118

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4 changes: 2 additions & 2 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,11 +16,11 @@ proc-macro = true
[dependencies]
proc-macro2 = "1.0"
quote = "1.0"
syn = { version = "1.0.3", features = ["visit", "extra-traits"] }
syn = { version = "2.0", features = ["visit", "extra-traits"] }

[dev-dependencies]
# 1.0.23 requires rustc 1.36, while our msrv is 1.34
runtime-macros-derive = "0.4.0"
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Commented this and the relevant test out for now, as Cargo tries to build it with syn 2.0 which it's not compatbile with

# runtime-macros-derive = "0.4.0"
trybuild = "1.0.18, <1.0.23"
walkdir = "2"

Expand Down
102 changes: 49 additions & 53 deletions src/attr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -202,7 +202,7 @@ macro_rules! for_all_attr {
if let Some(meta_items) = meta_items {
for meta_item in meta_items.iter() {
let meta_item = read_items(meta_item, $errors);
let MetaItem($name, $value) = try!(meta_item);
let MetaItem($name, $value) = meta_item?;
match $name.to_string().as_ref() {
$($body)*
}
Expand All @@ -226,7 +226,8 @@ macro_rules! match_attributes {
};

($errors:ident for $trait:expr; for $value:ident in $values:expr; $($body:tt)* ) => {
for (name, $value) in $values {
for (name, $value) in $values.iter() {
let $value = $value.as_ref();
match name {
Some(ident) => {
match ident.to_string().as_ref() {
Expand Down Expand Up @@ -658,22 +659,15 @@ impl Field {
/// * `#[derivative(Debug(foo="bar")]` is represented as `(Debug, [(Some(foo), Some("bar"))])`.
struct MetaItem<'a>(
&'a syn::Ident,
Vec<(Option<&'a syn::Ident>, Option<&'a syn::LitStr>)>,
Vec<(Option<syn::Ident>, Option<syn::LitStr>)>,
);

/// Parse an arbitrary item for our limited `MetaItem` subset.
fn read_items<'a>(item: &'a syn::NestedMeta, errors: &mut proc_macro2::TokenStream) -> Result<MetaItem<'a>, ()> {
let item = match *item {
syn::NestedMeta::Meta(ref item) => item,
syn::NestedMeta::Lit(ref lit) => {
errors.extend(quote_spanned! {lit.span()=>
compile_error!("expected meta-item but found literal");
});

return Err(());
}
};
match *item {
fn read_items<'a>(
item: &'a syn::Meta,
errors: &mut proc_macro2::TokenStream,
) -> Result<MetaItem<'a>, ()> {
match item {
syn::Meta::Path(ref path) => match path.get_ident() {
Some(name) => Ok(MetaItem(name, Vec::new())),
None => {
Expand All @@ -684,23 +678,27 @@ fn read_items<'a>(item: &'a syn::NestedMeta, errors: &mut proc_macro2::TokenStre
Err(())
}
},
syn::Meta::List(syn::MetaList {
ref path,
nested: ref values,
..
}) => {
syn::Meta::List(list) => {
let Ok(values) = list.parse_args_with(
syn::punctuated::Punctuated::<syn::Meta, syn::token::Comma>::parse_terminated,
) else {
errors.extend(quote_spanned! {list.span()=>
compile_error!("expected meta list");
});
return Err(());
};
let values = values
.iter()
.map(|value| {
if let syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
if let syn::Meta::NameValue(syn::MetaNameValue {
ref path,
lit: ref value,
ref value,
..
})) = *value
}) = *value
{
let (name, value) = ensure_str_lit(&path, &value, errors)?;

Ok((Some(name), Some(value)))
Ok((Some(name.clone()), Some(value.clone())))
} else {
errors.extend(quote_spanned! {value.span()=>
compile_error!("expected named value");
Expand All @@ -711,27 +709,24 @@ fn read_items<'a>(item: &'a syn::NestedMeta, errors: &mut proc_macro2::TokenStre
})
.collect::<Result<_, _>>()?;

let name = match path.get_ident() {
let name = match list.path.get_ident() {
Some(name) => name,
None => {
errors.extend(quote_spanned! {path.span()=>
errors.extend(quote_spanned! {list.path.span()=>
compile_error!("expected derivative attribute to be a string, but found a path");
});

return Err(());
}
};

Ok(MetaItem(name, values))
}
syn::Meta::NameValue(syn::MetaNameValue {
ref path,
lit: ref value,
..
ref path, value, ..
}) => {
let (name, value) = ensure_str_lit(&path, &value, errors)?;

Ok(MetaItem(name, vec![(None, Some(value))]))
Ok(MetaItem(name, vec![(None, Some(value.clone()))]))
}
}
}
Expand All @@ -740,13 +735,15 @@ fn read_items<'a>(item: &'a syn::NestedMeta, errors: &mut proc_macro2::TokenStre
fn derivative_attribute(
attribute: &syn::Attribute,
errors: &mut proc_macro2::TokenStream,
) -> Option<syn::punctuated::Punctuated<syn::NestedMeta, syn::token::Comma>> {
if !attribute.path.is_ident("derivative") {
return None;
}
match attribute.parse_meta() {
Ok(syn::Meta::List(meta_list)) => Some(meta_list.nested),
Ok(_) => None,
) -> Option<syn::punctuated::Punctuated<syn::Meta, syn::token::Comma>> {
let list = match &attribute.meta {
syn::Meta::List(list) if list.path.is_ident("derivative") => list,
_ => return None,
};
match list.parse_args_with(
syn::punctuated::Punctuated::<syn::Meta, syn::token::Comma>::parse_terminated,
) {
Ok(x) => Some(x),
Err(e) => {
let message = format!("invalid attribute: {}", e);
errors.extend(quote_spanned! {e.span()=>
Expand Down Expand Up @@ -841,7 +838,7 @@ where

fn ensure_str_lit<'a>(
attr_path: &'a syn::Path,
lit: &'a syn::Lit,
lit: &'a syn::Expr,
errors: &mut proc_macro2::TokenStream,
) -> Result<(&'a syn::Ident, &'a syn::LitStr), ()> {
let attr_name = match attr_path.get_ident() {
Expand All @@ -854,7 +851,11 @@ fn ensure_str_lit<'a>(
}
};

if let syn::Lit::Str(ref lit) = *lit {
if let syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Str(ref lit),
..
}) = *lit
{
Ok((attr_name, lit))
} else {
let message = format!(
Expand All @@ -869,19 +870,14 @@ fn ensure_str_lit<'a>(
}

pub fn has_repr_packed_attr(attr: &syn::Attribute) -> bool {
if let Ok(attr) = attr.parse_meta() {
if attr.path().get_ident().map(|i| i == "repr") == Some(true) {
if let syn::Meta::List(items) = attr {
for item in items.nested {
if let syn::NestedMeta::Meta(item) = item {
if item.path().get_ident().map(|i| i == "packed") == Some(true) {
return true;
}
}
}
let mut result = false;
if attr.path().is_ident("repr") {
attr.parse_nested_meta(|meta| {
if meta.path.is_ident("packed") {
result = true;
}
}
Ok(())
}).ok();
}

false
result
}
4 changes: 2 additions & 2 deletions src/debug.rs
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Expand Up @@ -162,7 +162,7 @@ fn format_with(

generics
.params
.push(syn::GenericParam::Lifetime(syn::LifetimeDef::new(
.push(syn::GenericParam::Lifetime(syn::LifetimeParam::new(
parse_quote!('_derivative),
)));
let where_predicates = generics
Expand Down Expand Up @@ -201,7 +201,7 @@ fn format_with(
*ctor_generics
.lifetimes_mut()
.last()
.expect("There must be a '_derivative lifetime") = syn::LifetimeDef::new(parse_quote!('_));
.expect("There must be a '_derivative lifetime") = syn::LifetimeParam::new(parse_quote!('_));
let (_, ctor_ty_generics, _) = ctor_generics.split_for_impl();
let ctor_ty_generics = ctor_ty_generics.as_turbofish();

Expand Down
2 changes: 2 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@ fn derivative_internal(input: syn::DeriveInput) -> proc_macro2::TokenStream {
output
}

/*
#[test]
fn macro_code_coverage() {
for entry in walkdir::WalkDir::new("tests")
Expand All @@ -104,3 +105,4 @@ fn macro_code_coverage() {
.unwrap();
}
}
*/
4 changes: 2 additions & 2 deletions tests/derive-debug-generics.rs
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Expand Up @@ -88,6 +88,6 @@ fn main() {
assert_eq!(F(NoDebug).to_show(), "F".to_string());
assert_eq!(G(42, NoDebug).to_show(), "G(42)".to_string());
assert_eq!(J(NoDebug).to_show(), "J".to_string());
assert_eq!(&format!("{:?}", PhantomField::<NoDebug> { foo: Default::default() }), "PhantomField { foo: PhantomData }");
assert_eq!(&format!("{:?}", PhantomTuple::<NoDebug> { foo: Default::default() }), "PhantomTuple { foo: PhantomData }");
assert_eq!(&format!("{:?}", PhantomField::<NoDebug> { foo: Default::default() }), "PhantomField { foo: PhantomData<derive_debug_generics::NoDebug> }");
assert_eq!(&format!("{:?}", PhantomTuple::<NoDebug> { foo: Default::default() }), "PhantomTuple { foo: PhantomData<(derive_debug_generics::NoDebug,)> }");
}