1use proc_macro2::TokenStream;
2use quote::ToTokens;
3use syn::Ident;
4
5use crate::codegen::FromDeriveInputImpl;
6use crate::options::{DeriveInputShapeSet, OuterFrom, ParseAttribute, ParseData};
7use crate::{FromField, FromMeta, Result};
8
9use super::forwarded_field::ForwardedField;
10
11#[derive(Debug)]
12pub struct FdiOptions {
13 pub base: OuterFrom,
14
15 /// The field on the target struct which should receive the type visibility, if any.
16 pub vis: Option<Ident>,
17
18 /// The field on the target struct which should receive the type generics, if any.
19 pub generics: Option<Ident>,
20
21 /// The field on the target struct which should receive the derive input body, if any.
22 pub data: Option<ForwardedField>,
23
24 pub supports: Option<DeriveInputShapeSet>,
25}
26
27impl FdiOptions {
28 pub fn new(di: &syn::DeriveInput) -> Result<Self> {
29 (FdiOptions {
30 base: OuterFrom::start(di)?,
31 vis: Default::default(),
32 generics: Default::default(),
33 data: Default::default(),
34 supports: Default::default(),
35 })
36 .parse_attributes(&di.attrs)?
37 .parse_body(&di.data)
38 }
39}
40
41impl ParseAttribute for FdiOptions {
42 fn parse_nested(&mut self, mi: &syn::Meta) -> Result<()> {
43 if mi.path().is_ident("supports") {
44 self.supports = FromMeta::from_meta(item:mi)?;
45 Ok(())
46 } else {
47 self.base.parse_nested(mi)
48 }
49 }
50}
51
52impl ParseData for FdiOptions {
53 fn parse_variant(&mut self, variant: &syn::Variant) -> Result<()> {
54 self.base.parse_variant(variant)
55 }
56
57 fn parse_field(&mut self, field: &syn::Field) -> Result<()> {
58 match field.ident.as_ref().map(|v| v.to_string()).as_deref() {
59 Some("vis") => {
60 self.vis.clone_from(&field.ident);
61 Ok(())
62 }
63 Some("data") => {
64 self.data = ForwardedField::from_field(field).map(Some)?;
65 Ok(())
66 }
67 Some("generics") => {
68 self.generics.clone_from(&field.ident);
69 Ok(())
70 }
71 _ => self.base.parse_field(field),
72 }
73 }
74
75 fn validate_body(&self, errors: &mut crate::error::Accumulator) {
76 self.base.validate_body(errors);
77 }
78}
79
80impl<'a> From<&'a FdiOptions> for FromDeriveInputImpl<'a> {
81 fn from(v: &'a FdiOptions) -> Self {
82 FromDeriveInputImpl {
83 base: (&v.base.container).into(),
84 attr_names: &v.base.attr_names,
85 from_ident: v.base.from_ident,
86 ident: v.base.ident.as_ref(),
87 vis: v.vis.as_ref(),
88 data: v.data.as_ref(),
89 generics: v.generics.as_ref(),
90 forward_attrs: v.base.as_forward_attrs(),
91 supports: v.supports.as_ref(),
92 }
93 }
94}
95
96impl ToTokens for FdiOptions {
97 fn to_tokens(&self, tokens: &mut TokenStream) {
98 FromDeriveInputImpl::from(self).to_tokens(tokens)
99 }
100}
101