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use crate::defs;
use crate::func::impl_method_proto;
use crate::method::FnSpec;
use crate::pymethod;
use proc_macro2::TokenStream;
use quote::quote;
use quote::ToTokens;
pub fn build_py_proto(ast: &mut syn::ItemImpl) -> syn::Result<TokenStream> {
if let Some((_, ref mut path, _)) = ast.trait_ {
let proto = if let Some(ref mut segment) = path.segments.last() {
match segment.value().ident.to_string().as_str() {
"PyObjectProtocol" => &defs::OBJECT,
"PyAsyncProtocol" => &defs::ASYNC,
"PyMappingProtocol" => &defs::MAPPING,
"PyIterProtocol" => &defs::ITER,
"PyContextProtocol" => &defs::CONTEXT,
"PySequenceProtocol" => &defs::SEQ,
"PyNumberProtocol" => &defs::NUM,
"PyDescrProtocol" => &defs::DESCR,
"PyBufferProtocol" => &defs::BUFFER,
"PyGCProtocol" => &defs::GC,
_ => {
return Err(syn::Error::new_spanned(
path,
"#[pyproto] can not be used with this block",
));
}
}
} else {
return Err(syn::Error::new_spanned(
path,
"#[pyproto] can only be used with protocol trait implementations",
));
};
let tokens = impl_proto_impl(&ast.self_ty, &mut ast.items, proto);
let mut seg = path.segments.pop().unwrap().into_value();
seg.arguments = syn::PathArguments::AngleBracketed(syn::parse_quote! {<'p>});
path.segments.push(seg);
ast.generics.params = syn::parse_quote! {'p};
Ok(tokens)
} else {
return Err(syn::Error::new_spanned(
ast,
"#[pyproto] can only be used with protocol trait implementations",
));
}
}
fn impl_proto_impl(
ty: &syn::Type,
impls: &mut Vec<syn::ImplItem>,
proto: &defs::Proto,
) -> TokenStream {
let mut tokens = TokenStream::new();
let mut py_methods = Vec::new();
for iimpl in impls.iter_mut() {
if let syn::ImplItem::Method(ref mut met) = iimpl {
for m in proto.methods {
if m == met.sig.ident.to_string().as_str() {
impl_method_proto(ty, &mut met.sig, m).to_tokens(&mut tokens);
}
}
for m in proto.py_methods {
let ident = met.sig.ident.clone();
if m.name == ident.to_string().as_str() {
let name: syn::Ident = syn::parse_str(m.name).unwrap();
let proto: syn::Path = syn::parse_str(m.proto).unwrap();
let fn_spec = match FnSpec::parse(&ident, &met.sig, &mut met.attrs) {
Ok(fn_spec) => fn_spec,
Err(err) => return err.to_compile_error(),
};
let meth = pymethod::impl_proto_wrap(ty, &ident, &fn_spec);
py_methods.push(quote! {
impl #proto for #ty
{
#[inline]
fn #name() -> Option<pyo3::class::methods::PyMethodDef> {
#meth
Some(pyo3::class::PyMethodDef {
ml_name: stringify!(#name),
ml_meth: pyo3::class::PyMethodType::PyCFunctionWithKeywords(__wrap),
ml_flags: pyo3::ffi::METH_VARARGS | pyo3::ffi::METH_KEYWORDS,
ml_doc: ""
})
}
}
});
}
}
}
}
quote! {
#tokens
#(#py_methods)*
}
}