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use crate::pymethod;
use proc_macro2::TokenStream;
use quote::quote;
pub fn build_py_methods(ast: &mut syn::ItemImpl) -> syn::Result<TokenStream> {
if let Some((_, ref path, _)) = ast.trait_ {
Err(syn::Error::new_spanned(
path,
"#[pymethods] can not be used only with trait impl block",
))
} else if ast.generics != Default::default() {
Err(syn::Error::new_spanned(
ast.generics.clone(),
"#[pymethods] can not be used with lifetime parameters or generics",
))
} else {
impl_methods(&ast.self_ty, &mut ast.items)
}
}
pub fn impl_methods(ty: &syn::Type, impls: &mut Vec<syn::ImplItem>) -> syn::Result<TokenStream> {
let mut methods = Vec::new();
for iimpl in impls.iter_mut() {
if let syn::ImplItem::Method(ref mut meth) = iimpl {
methods.push(pymethod::gen_py_method(ty, &mut meth.sig, &mut meth.attrs)?);
}
}
Ok(quote! {
pyo3::inventory::submit! {
#![crate = pyo3] {
type TyInventory = <#ty as pyo3::class::methods::PyMethodsInventoryDispatch>::InventoryType;
<TyInventory as pyo3::class::methods::PyMethodsInventory>::new(&[#(#methods),*])
}
}
})
}