darling_core/options/
from_field.rs

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1use proc_macro2::TokenStream;
2use quote::ToTokens;
3use syn::Ident;
4
5use crate::codegen::FromFieldImpl;
6use crate::options::{OuterFrom, ParseAttribute, ParseData};
7use crate::Result;
8
9#[derive(Debug)]
10pub struct FromFieldOptions {
11    pub base: OuterFrom,
12    pub vis: Option<Ident>,
13    pub ty: Option<Ident>,
14}
15
16impl FromFieldOptions {
17    pub fn new(di: &syn::DeriveInput) -> Result<Self> {
18        (FromFieldOptions {
19            base: OuterFrom::start(di)?,
20            vis: Default::default(),
21            ty: Default::default(),
22        })
23        .parse_attributes(&di.attrs)?
24        .parse_body(&di.data)
25    }
26}
27
28impl ParseAttribute for FromFieldOptions {
29    fn parse_nested(&mut self, mi: &syn::Meta) -> Result<()> {
30        self.base.parse_nested(mi)
31    }
32}
33
34impl ParseData for FromFieldOptions {
35    fn parse_variant(&mut self, variant: &syn::Variant) -> Result<()> {
36        self.base.parse_variant(variant)
37    }
38
39    fn parse_field(&mut self, field: &syn::Field) -> Result<()> {
40        match field.ident.as_ref().map(|v| v.to_string()).as_deref() {
41            Some("vis") => {
42                self.vis.clone_from(&field.ident);
43                Ok(())
44            }
45            Some("ty") => {
46                self.ty.clone_from(&field.ident);
47                Ok(())
48            }
49            _ => self.base.parse_field(field),
50        }
51    }
52
53    fn validate_body(&self, errors: &mut crate::error::Accumulator) {
54        self.base.validate_body(errors);
55    }
56}
57
58impl<'a> From<&'a FromFieldOptions> for FromFieldImpl<'a> {
59    fn from(v: &'a FromFieldOptions) -> Self {
60        FromFieldImpl {
61            ident: v.base.ident.as_ref(),
62            vis: v.vis.as_ref(),
63            ty: v.ty.as_ref(),
64            base: (&v.base.container).into(),
65            attr_names: &v.base.attr_names,
66            forward_attrs: v.base.as_forward_attrs(),
67            from_ident: v.base.from_ident,
68        }
69    }
70}
71
72impl ToTokens for FromFieldOptions {
73    fn to_tokens(&self, tokens: &mut TokenStream) {
74        FromFieldImpl::from(self).to_tokens(tokens)
75    }
76}
darling_core/options/from_field.rs

darling_core/options/
from_field.rs
