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use quote::{ToTokens, quote};
use syn::{
FnArg, GenericParam, Generics, ItemFn, Pat, PatIdent, PatType, Signature, Type, WhereClause,
WherePredicate, parse::Parse, spanned::Spanned,
};
pub struct ParsedComponent {
f: ItemFn,
props_type: Option<Box<Type>>,
impl_args: Vec<proc_macro2::TokenStream>,
}
impl Parse for ParsedComponent {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let f = input.parse::<ItemFn>()?;
let mut props_type = None;
let mut impl_args = Vec::new();
for arg in f.sig.inputs.iter() {
match &arg {
FnArg::Typed(PatType { pat, ty, .. }) => {
if let Pat::Ident(PatIdent { ident, .. }) = &**pat {
match ident.to_string().as_str() {
"props" | "_props" => {
if props_type.is_some() {
return Err(syn::Error::new(
arg.span(),
"duplicate props argument",
));
}
match &**ty {
Type::Reference(r) => {
props_type = Some(r.elem.clone());
impl_args.push(quote!(props));
}
_ => {
return Err(syn::Error::new(
ty.span(),
"invalid `props` type (must be a reference)",
));
}
}
}
"hooks" | "_hooks" => match &**ty {
Type::Reference(_) => {
impl_args.push(quote!(&mut hooks));
}
Type::Path(_) => {
impl_args.push(quote!(hooks));
}
_ => {
return Err(syn::Error::new(
ty.span(),
"invalid `hooks` type (must be a reference or a value)",
));
}
},
_ => {
return Err(syn::Error::new(
arg.span(),
"invalid argument name, expected `props` or `hooks`",
));
}
}
} else {
return Err(syn::Error::new(pat.span(), "invalid argument"));
}
}
_ => return Err(syn::Error::new(arg.span(), "invalid argument")),
}
}
Ok(Self {
f,
props_type,
impl_args,
})
}
}
impl ToTokens for ParsedComponent {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
let ItemFn {
attrs,
vis,
sig:
Signature {
ident,
generics,
inputs,
output,
..
},
block,
} = &self.f;
let lifetime_generics = Generics {
params: generics
.params
.iter()
.filter(|params| matches!(params, GenericParam::Lifetime(_)))
.cloned()
.collect(),
where_clause: generics
.where_clause
.as_ref()
.map(|where_clause| WhereClause {
predicates: where_clause
.predicates
.iter()
.filter(|predicate| matches!(predicate, WherePredicate::Lifetime(_)))
.cloned()
.collect(),
..where_clause.clone()
}),
..generics.clone()
};
let type_generics = Generics {
params: generics
.params
.iter()
.filter(|params| !matches!(params, GenericParam::Lifetime(_)))
.cloned()
.collect(),
where_clause: generics
.where_clause
.as_ref()
.map(|where_clause| WhereClause {
predicates: where_clause
.predicates
.iter()
.filter(|predicate| !matches!(predicate, WherePredicate::Lifetime(_)))
.cloned()
.collect(),
..where_clause.clone()
}),
..generics.clone()
};
let (lifetime_generics, _, lifetime_where_clause) = lifetime_generics.split_for_impl();
let (impl_generics, ty_generics, where_clause) = type_generics.split_for_impl();
let ty_generics_names = type_generics.params.iter().filter_map(|params| {
if let GenericParam::Type(ty) = params {
Some(ty.ident.to_token_stream())
} else {
None
}
});
let impl_args = &self.impl_args;
let props_type_name = self
.props_type
.as_ref()
.map(|ty| ty.to_token_stream())
.unwrap_or_else(|| quote!(::ratatui_kit::NoProps));
tokens.extend(quote! {
#(#attrs)*
#vis struct #ident #impl_generics {
_marker: std::marker::PhantomData<fn(#(#ty_generics_names),*)>,
}
impl #impl_generics #ident #ty_generics #where_clause{
fn implementation #lifetime_generics (#inputs) #output #lifetime_where_clause #block
}
impl #impl_generics ::ratatui_kit::Component for #ident #ty_generics #where_clause{
type Props<'a> = #props_type_name;
fn new(props: &Self::Props<'_>) -> Self {
Self {
_marker: std::marker::PhantomData,
}
}
fn update(
&mut self,
props: &mut Self::Props<'_>,
mut hooks: ::ratatui_kit::Hooks,
updater: &mut ::ratatui_kit::ComponentUpdater,
) {
let mut element={
let mut hooks=hooks.with_context_stack(updater.component_context_stack());
Self::implementation(#(#impl_args),*).into()
};
updater.set_transparent_layout(true);
updater.update_children([&mut element], None);
}
}
});
}
}