rg3d-core-derive 0.13.0

Proc-macro for Visit trait
Documentation 
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use darling::*;
use syn::*;

#[derive(FromDeriveInput)]
#[darling(attributes(visit), supports(struct_any, enum_any))]
pub struct TypeArgs {
    pub ident: Ident,
    // pub vis: Visibility,
    pub generics: Generics,
    pub data: ast::Data<VariantArgs, FieldArgs>,
    // attrs: Vec<Attribute>
}

/// Parsed from struct's or enum variant's field
#[derive(FromField, Clone)]
#[darling(attributes(visit))]
pub struct FieldArgs {
    pub ident: Option<Ident>,
    // pub vis: Visibility,
    pub ty: Type,
    // pub attrs: Vec<Attribute>,
    // ---
    /// `#[visit(skip)]`: skip on read and write
    #[darling(default)]
    pub skip: bool,

    /// `#[visit(rename = "..")]`: force reading/writing as this name
    #[darling(default)]
    pub rename: Option<String>,

    /// `#[visit(optional)]`: ignore missing field
    #[darling(default)]
    pub optional: bool,
}

#[derive(FromVariant)]
#[darling(attributes(inspect))]
pub struct VariantArgs {
    pub ident: Ident,
    pub fields: ast::Fields<FieldArgs>,
}