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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| # Clippy configuration | ||
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| doc-valid-idents = ["SELinux", ".."] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| //! Implementation of the [`Default`](super::default()) derive macro. | ||
| use proc_macro2::TokenStream; | ||
| use quote::quote; | ||
| use syn::{ | ||
| spanned::Spanned, Data, DataStruct, DeriveInput, Error, Expr, Fields, FieldsNamed, Generics, | ||
| Ident, Result, | ||
| }; | ||
|
|
||
| /// [`Default`](super::default()) derive macro input. | ||
| /// | ||
| /// Created with [`Input::from_syn()`]. | ||
| pub struct Input<'a> { | ||
| /// Name of the input struct. | ||
| ident: &'a Ident, | ||
|
|
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| /// Input struct generics. | ||
| generics: &'a Generics, | ||
|
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| /// Fields of the input struct. | ||
| fields: Vec<Field<'a>>, | ||
| } | ||
|
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| impl<'a> Input<'a> { | ||
| /// Create an [`Input`] from [`DeriveInput`]. | ||
| /// | ||
| /// # Errors | ||
| /// | ||
| /// Returns an error if the input is not a struct with named fields or a `default` attribute has | ||
| /// an incorrect format or duplicates. | ||
| pub fn from_syn( | ||
| DeriveInput { | ||
| ident, | ||
| generics, | ||
| data, | ||
| .. | ||
| }: &'a DeriveInput, | ||
| ) -> Result<Self> { | ||
| let Data::Struct(DataStruct { | ||
| fields: Fields::Named(FieldsNamed { named: fields, .. }), | ||
| .. | ||
| }) = data | ||
| else { | ||
| return Err(Error::new( | ||
| ident.span(), | ||
| "must be used on structs with named fields", | ||
| )); | ||
| }; | ||
|
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| let fields = fields.iter().map(Field::from_syn).collect::<Result<_>>()?; | ||
|
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| Ok(Self { | ||
| ident, | ||
| generics, | ||
| fields, | ||
| }) | ||
| } | ||
|
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| /// Expand the input into a [`Default`] implementation. | ||
| pub fn expand(self) -> TokenStream { | ||
| let Self { | ||
| ident, | ||
| generics, | ||
| fields, | ||
| } = self; | ||
|
|
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| let (impl_generics, type_generics, where_clause) = generics.split_for_impl(); | ||
|
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| let fields = fields.into_iter().map(Field::expand); | ||
|
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| quote! { | ||
| impl #impl_generics ::std::default::Default for #ident #type_generics #where_clause { | ||
| fn default() -> Self { | ||
| Self { | ||
| #(#fields,)* | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Field with an optional `#[default = {default}]` attribute. | ||
| struct Field<'a> { | ||
| /// Expression to use as the default value for the field. | ||
| default: Option<&'a Expr>, | ||
|
|
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| /// Field name. | ||
| ident: &'a Ident, | ||
| } | ||
|
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| impl<'a> Field<'a> { | ||
| /// Create a [`Field`] from a [`syn::Field`]. | ||
| /// | ||
| /// # Errors | ||
| /// | ||
| /// Returns an error if a `default` attribute has an incorrect format or duplicates. | ||
| fn from_syn(syn::Field { attrs, ident, .. }: &'a syn::Field) -> Result<Self> { | ||
| let mut default = None; | ||
|
|
||
| for attribute in attrs { | ||
| if attribute.path().is_ident("default") { | ||
| if default.is_some() { | ||
| return Err(Error::new( | ||
| attribute.span(), | ||
| "duplicate `default` attribute", | ||
| )); | ||
| } | ||
|
|
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| default = Some(&attribute.meta.require_name_value()?.value); | ||
| } | ||
| } | ||
|
|
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| Ok(Self { | ||
| default, | ||
| ident: ident.as_ref().expect("named field"), | ||
| }) | ||
| } | ||
|
|
||
| /// Expand into a struct field for a [`Default`] implementation. | ||
| fn expand(self) -> TokenStream { | ||
| let Self { default, ident } = self; | ||
|
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| if let Some(default) = default { | ||
| quote!(#ident: #default) | ||
| } else { | ||
| quote!(#ident: ::std::default::Default::default()) | ||
| } | ||
| } | ||
| } |
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