6 releases (3 breaking)
0.4.0 | Aug 19, 2024 |
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0.3.0 | Dec 27, 2023 |
0.2.0 | Sep 21, 2023 |
0.1.2 | Jul 9, 2023 |
0.1.1 | Jun 28, 2023 |
#259 in Procedural macros
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Used in 35 crates
(2 directly)
16KB
294 lines
derive_util
derive_util provides tools for derive macros.
struct visitor
The struct visitor provides a method that dispatches over the type of struct. It is up to the implementor to implement for named-fields, unnamed-fields, and the unit struct.
To override named fields, declare method StructVisitor::visit_struct_named_fields.
fn visit_struct_named_fields(
&mut self,
ty_name: &syn::Ident,
ds: &syn::DataStruct,
fields: &syn::FieldsNamed,
) -> Self::Output;
To override unnamed fields, declare method StructVisitor::visit_struct_unnamed_fields.
fn visit_struct_unnamed_fields(
&mut self,
ty_name: &syn::Ident,
ds: &syn::DataStruct,
fields: &syn::FieldsUnnamed,
) -> Self::Output;
To override the unit struct, declare method StructVisitor::visit_struct_unit.
fn visit_struct_unit(&mut self, _ty_name: &syn::Ident, _ds: &syn::DataStruct) -> Self::Output;
enum visitor
To override the struct with named fields, declare method EnumVisitor::visit_enum_variant_named_field.
fn visit_enum_variant_named_field(
&mut self,
ty_name: &syn::Ident,
de: &syn::DataEnum,
variant: &syn::Variant,
fields: &syn::FieldsNamed,
) -> Self::VariantOutput;
To override the struct with unnamed fields, declare method EnumVisitor::visit_enum_variant_unnamed_field.
fn visit_enum_variant_unnamed_field(
&mut self,
ty_name: &syn::Ident,
de: &syn::DataEnum,
variant: &syn::Variant,
fields: &syn::FieldsUnnamed,
) -> Self::VariantOutput;
To override the unit enum, declare method EnumVisitor::visit_enum_variant_unit.
fn visit_enum_variant_unit(
&mut self,
ty_name: &syn::Ident,
de: &syn::DataEnum,
variant: &syn::Variant,
) -> Self::VariantOutput;
Each variant returns Self::VariantOutput
. Combine these outputs into one Self::Output
.
fn combine_variants(
&mut self,
ty_name: &syn::Ident,
de: &syn::DataEnum,
variants: &[Self::VariantOutput],
) -> Self::Output;
Status
Maintenance track. The library is considered stable and will be put into maintenance mode if unchanged for one year. This library was last updated 2023-09-23.
Scope
This library will provide visitors for the core rust data types for use in derive macros.
Warts
- The library is not complete enough to be used in prototk from which it was derived.
Documentation
The latest documentation is always available at docs.rs.
Dependencies
~1.5MB
~35K SLoC