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use proc_macro2::Ident;
use proc_macro2::TokenStream;
use quote::quote;
use syn::DeriveInput;
use syn::Generics;
use crate::config::Configs;
use crate::config::InferKind;
#[derive(Debug)]
pub struct InferGenerator<'a> {
ident: &'a Ident,
configs: Configs<InferKind>,
generics: &'a Generics,
}
impl<'a> InferGenerator<'a> {
pub fn new(input: &'a DeriveInput) -> syn::Result<Self> {
let ident = &input.ident;
let generics = &input.generics;
let configs = Configs::<InferKind>::parse_attrs("infer", &input.attrs);
Ok(Self {
ident,
configs,
generics,
})
}
pub fn gen_impl_for_struct(&self) -> syn::Result<TokenStream> {
let ident = self.ident;
let (impl_inf, type_inf, where_inf) = self.generics.split_for_impl();
let mut codes = vec![];
for config in self.configs.iter() {
let value = config.value();
codes.push(match config.kind() {
InferKind::Override => {
quote! {}
}
InferKind::Val => {
quote! {
type Val = #value;
}
}
InferKind::Action => {
quote! {
fn infer_act() -> cote::prelude::Action {
#value
}
}
}
InferKind::Force => {
quote! {
fn infer_force() -> bool {
#value
}
}
}
InferKind::Ctor => {
quote! {
fn infer_ctor() -> String {
#value
}
}
}
InferKind::Index => quote! {
fn infer_index() -> Option<cote::prelude::Index> {
#value
}
},
InferKind::Style => quote! {
fn infer_style() -> Vec<cote::prelude::Style> {
#value
}
},
InferKind::IgName => quote! {
fn infer_ignore_name() -> bool {
#value
}
},
InferKind::IgAlias => quote! {
fn infer_ignore_alias() -> bool {
#value
}
},
InferKind::IgIndex => quote! {
fn infer_ignore_index() -> bool {
#value
}
},
InferKind::Valid => quote! {
fn infer_validator() -> Option<cote::prelude::ValValidator<Self::Val>> {
#value
}
},
InferKind::Init => quote! {
fn infer_initializer() -> Option<cote::prelude::ValInitializer> {
#value
}
},
InferKind::Type => quote! {
fn infer_type_id() -> std::any::TypeId {
#value
}
},
InferKind::Map => quote! {
fn infer_map(val: Self::Val) -> Self {
(#value)(val)
}
},
InferKind::Mutable => quote! {
fn infer_mutable(&mut self, val: Self::Val)
where
Self: Sized,
{
(#value)(val)
}
},
InferKind::Tweak => quote! {
fn infer_tweak_info<C>(cfg: &mut C) -> cote::Result<()>
where
Self: Sized + 'static,
Self::Val: cote::prelude::RawValParser,
C: cote::prelude::ConfigValue + Default,
{
#value(cfg);
Ok(())
}
},
InferKind::Fill => quote! {
fn infer_fill_info<C>(cfg: &mut C) -> cote::Result<()>
where
Self: Sized + 'static,
Self::Val: cote::prelude::RawValParser,
C: cote::prelude::ConfigValue + Default,
{
#value(cfg, ignore_infer);
Ok(())
}
},
});
}
if !self.configs.has_cfg(InferKind::Val) {
codes.push(quote! {
type Val = Self;
})
}
if !self.configs.has_cfg(InferKind::Map) {
codes.push(quote! {
fn infer_map(val: Self::Val) -> Self {
val
}
});
}
let mut infer_override_impl = None;
if !self.configs.has_cfg(InferKind::Override) {
infer_override_impl = Some(quote! {
impl #impl_inf cote::prelude::InferOverride for #ident #type_inf #where_inf { }
});
}
Ok(quote! {
impl #impl_inf cote::prelude::Infer for #ident #type_inf #where_inf {
#(#codes)*
}
#infer_override_impl
})
}
}