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use proc_macro::{Span, TokenStream};
use quote::quote;
use syn::{parse_macro_input, Ident, ItemStruct, Lit, Meta, NestedMeta, Visibility};
#[derive(Default)]
struct StructAttributes {
pub name: Option<Ident>,
pub module_name: Option<Ident>,
pub override_send: Option<bool>,
pub override_sync: Option<bool>,
pub debug: bool,
}
#[derive(Default)]
struct FieldAttributes {
pub name: Option<Ident>,
pub ignore: bool,
}
macro_rules! parse_struct_attributes {
($attributes:expr) => {{
let mut result = StructAttributes::default();
for attribute in $attributes {
let attribute = match attribute.parse_meta() {
Ok(attribute) => attribute,
Err(err) => return TokenStream::from(err.to_compile_error()),
};
match attribute {
Meta::List(list) => {
if list.path.is_ident("intuicio") {
for meta in list.nested.iter() {
match meta {
NestedMeta::Meta(meta) => match meta {
Meta::Path(path) => {
if path.is_ident("debug") {
result.debug = true;
}
}
Meta::NameValue(name_value) => {
if name_value.path.is_ident("name") {
match &name_value.lit {
Lit::Str(content) => {
result.name = Some(Ident::new(
&content.value(),
Span::call_site().into(),
))
}
_ => {}
}
} else if name_value.path.is_ident("module_name") {
match &name_value.lit {
Lit::Str(content) => {
result.module_name = Some(Ident::new(
&content.value(),
Span::call_site().into(),
))
}
_ => {}
}
} else if name_value.path.is_ident("override_send") {
match &name_value.lit {
Lit::Bool(content) => {
result.override_send = Some(content.value)
}
_ => {}
}
} else if name_value.path.is_ident("override_sync") {
match &name_value.lit {
Lit::Bool(content) => {
result.override_sync = Some(content.value)
}
_ => {}
}
}
}
_ => {}
},
_ => {}
}
}
}
}
_ => {}
}
}
result
}};
}
macro_rules! parse_field_attributes {
($attributes:expr) => {{
let mut result = FieldAttributes::default();
for attribute in $attributes {
let attribute = match attribute.parse_meta() {
Ok(attribute) => attribute,
Err(err) => return TokenStream::from(err.to_compile_error()),
};
match attribute {
Meta::List(list) => {
if list.path.is_ident("intuicio") {
for meta in list.nested.iter() {
match meta {
NestedMeta::Meta(meta) => match meta {
Meta::Path(path) => {
if path.is_ident("ignore") {
result.ignore = true;
}
}
Meta::NameValue(name_value) => {
if name_value.path.is_ident("name") {
match &name_value.lit {
Lit::Str(content) => {
result.name = Some(Ident::new(
&content.value(),
Span::call_site().into(),
))
}
_ => {}
}
}
}
_ => {}
},
_ => {}
}
}
}
}
_ => {}
}
}
result
}};
}
pub fn intuicio_struct(input: TokenStream) -> TokenStream {
let input2 = input.clone();
let ItemStruct {
attrs,
ident,
vis,
fields,
..
} = parse_macro_input!(input2 as ItemStruct);
let StructAttributes {
name,
module_name,
override_send,
override_sync,
debug,
} = parse_struct_attributes!(attrs);
let name = if let Some(name) = name {
quote! { stringify!(#name) }
} else {
quote! { std::any::type_name::<#ident>() }
};
let visibility = match vis {
Visibility::Inherited => {
quote! { result = result.visibility(intuicio_core::Visibility::Private); }
}
Visibility::Restricted(_) | Visibility::Crate(_) => {
quote! { result = result.visibility(intuicio_core::Visibility::Module); }
}
Visibility::Public(_) => quote! {},
};
let module_name = if let Some(module_name) = module_name {
quote! { result = result.module_name(stringify!(#module_name)); }
} else {
quote! {}
};
let mut fields_attributes = Vec::with_capacity(fields.len());
for field in fields.iter() {
fields_attributes.push(parse_field_attributes!(&field.attrs));
}
let fields = fields
.iter()
.zip(fields_attributes.into_iter())
.filter_map(|(field, attributes)| {
let FieldAttributes { name, ignore } = attributes;
if ignore {
return None;
}
let field_name = match field.ident.as_ref() {
Some(ident) => ident,
None => panic!("Struct: {} has field without a name!", ident),
};
let name = if let Some(name) = name {
quote! { stringify!(#name) }
} else {
quote! { stringify!(#field_name) }
};
let field_type = &field.ty;
let visibility = match field.vis {
Visibility::Inherited => {
quote! { field.visibility = intuicio_core::Visibility::Private; }
}
Visibility::Restricted(_) | Visibility::Crate(_) => {
quote! { field.visibility = intuicio_core::Visibility::Module; }
}
Visibility::Public(_) => quote! {},
};
Some(quote! {
let mut field = intuicio_core::struct_type::StructField::new(
#name,
registry
.find_struct(intuicio_core::struct_type::StructQuery::of_type_name::<#field_type>())
.unwrap(),
);
#visibility
result = result.field(
field,
intuicio_core::__internal::offset_of!(#ident, #field_name),
);
})
})
.collect::<Vec<_>>();
let override_send = if let Some(override_send) = override_send {
quote! { result = unsafe { result.override_send(#override_send) }; }
} else {
quote! {}
};
let override_sync = if let Some(override_sync) = override_sync {
quote! { result = unsafe { result.override_sync(#override_sync) }; }
} else {
quote! {}
};
let result = quote! {
impl intuicio_core::IntuicioStruct for #ident {
#[allow(dead_code)]
fn define_struct(
registry: &intuicio_core::registry::Registry,
) -> intuicio_core::struct_type::Struct {
let name = #name;
let mut result = intuicio_core::struct_type::NativeStructBuilder::new_named::<#ident>(name);
#visibility
#module_name
#(#fields)*
#override_send
#override_sync
result.build()
}
}
}.into();
if debug {
println!(
"* Debug of `IntuicioStruct` derive macro\n- Input: {}\n- Result: {}",
input, result
);
}
result
}