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use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::Ident;
use crate::codegen::FromFieldImpl;
use crate::options::{OuterFrom, ParseAttribute, ParseData};
use crate::Result;
#[derive(Debug)]
pub struct FromFieldOptions {
pub base: OuterFrom,
pub vis: Option<Ident>,
pub ty: Option<Ident>,
}
impl FromFieldOptions {
pub fn new(di: &syn::DeriveInput) -> Result<Self> {
(FromFieldOptions {
base: OuterFrom::start(di)?,
vis: Default::default(),
ty: Default::default(),
})
.parse_attributes(&di.attrs)?
.parse_body(&di.data)
}
}
impl ParseAttribute for FromFieldOptions {
fn parse_nested(&mut self, mi: &syn::Meta) -> Result<()> {
self.base.parse_nested(mi)
}
}
impl ParseData for FromFieldOptions {
fn parse_variant(&mut self, variant: &syn::Variant) -> Result<()> {
self.base.parse_variant(variant)
}
fn parse_field(&mut self, field: &syn::Field) -> Result<()> {
match field.ident.as_ref().map(|v| v.to_string()).as_deref() {
Some("vis") => {
self.vis.clone_from(&field.ident);
Ok(())
}
Some("ty") => {
self.ty.clone_from(&field.ident);
Ok(())
}
_ => self.base.parse_field(field),
}
}
fn validate_body(&self, errors: &mut crate::error::Accumulator) {
self.base.validate_body(errors);
}
}
impl<'a> From<&'a FromFieldOptions> for FromFieldImpl<'a> {
fn from(v: &'a FromFieldOptions) -> Self {
FromFieldImpl {
ident: v.base.ident.as_ref(),
vis: v.vis.as_ref(),
ty: v.ty.as_ref(),
base: (&v.base.container).into(),
attr_names: &v.base.attr_names,
forward_attrs: v.base.as_forward_attrs(),
from_ident: v.base.from_ident,
}
}
}
impl ToTokens for FromFieldOptions {
fn to_tokens(&self, tokens: &mut TokenStream) {
FromFieldImpl::from(self).to_tokens(tokens)
}
}