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use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::Ident;
use crate::codegen::FromDeriveInputImpl;
use crate::options::{DeriveInputShapeSet, OuterFrom, ParseAttribute, ParseData};
use crate::{FromMeta, Result};
#[derive(Debug)]
pub struct FdiOptions {
pub base: OuterFrom,
/// The field on the target struct which should receive the type visibility, if any.
pub vis: Option<Ident>,
/// The field on the target struct which should receive the type generics, if any.
pub generics: Option<Ident>,
pub data: Option<Ident>,
pub supports: Option<DeriveInputShapeSet>,
}
impl FdiOptions {
pub fn new(di: &syn::DeriveInput) -> Result<Self> {
(FdiOptions {
base: OuterFrom::start(di)?,
vis: Default::default(),
generics: Default::default(),
data: Default::default(),
supports: Default::default(),
})
.parse_attributes(&di.attrs)?
.parse_body(&di.data)
}
}
impl ParseAttribute for FdiOptions {
fn parse_nested(&mut self, mi: &syn::Meta) -> Result<()> {
if mi.path().is_ident("supports") {
self.supports = FromMeta::from_meta(mi)?;
Ok(())
} else {
self.base.parse_nested(mi)
}
}
}
impl ParseData for FdiOptions {
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("data") => {
self.data.clone_from(&field.ident);
Ok(())
}
Some("generics") => {
self.generics.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 FdiOptions> for FromDeriveInputImpl<'a> {
fn from(v: &'a FdiOptions) -> Self {
FromDeriveInputImpl {
base: (&v.base.container).into(),
attr_names: &v.base.attr_names,
from_ident: v.base.from_ident,
ident: v.base.ident.as_ref(),
vis: v.vis.as_ref(),
data: v.data.as_ref(),
generics: v.generics.as_ref(),
forward_attrs: v.base.as_forward_attrs(),
supports: v.supports.as_ref(),
}
}
}
impl ToTokens for FdiOptions {
fn to_tokens(&self, tokens: &mut TokenStream) {
FromDeriveInputImpl::from(self).to_tokens(tokens)
}
}