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use protobuf::reflect::EnumDescriptor;
use protobuf::reflect::MessageDescriptor;
use crate::gen::code_writer::CodeWriter;
use crate::gen::file_descriptor::file_descriptor_call_expr;
use crate::gen::inside::protobuf_crate_path;
use crate::gen::scope::Scope;
use crate::Customize;
/// Abstract message or enum descriptor.
pub(crate) trait Descriptor {
const DESCRIPTOR_FN: &'static str;
const TYPE_NAME: &'static str;
const GET_BY_RELATIVE_NAME_NAME: &'static str;
fn name_to_package(&self) -> &str;
}
impl Descriptor for MessageDescriptor {
const DESCRIPTOR_FN: &'static str = "descriptor";
const TYPE_NAME: &'static str = "MessageDescriptor";
const GET_BY_RELATIVE_NAME_NAME: &'static str = "message_by_package_relative_name";
fn name_to_package(&self) -> &str {
self.name_to_package()
}
}
impl Descriptor for EnumDescriptor {
const DESCRIPTOR_FN: &'static str = "enum_descriptor";
const TYPE_NAME: &'static str = "EnumDescriptor";
const GET_BY_RELATIVE_NAME_NAME: &'static str = "enum_by_package_relative_name";
fn name_to_package(&self) -> &str {
self.name_to_package()
}
}
pub(crate) fn write_fn_descriptor<D: Descriptor>(
descriptor: &D,
scope: &Scope,
customize: &Customize,
w: &mut CodeWriter,
) {
let sig = format!(
"{}() -> {}::reflect::{}",
D::DESCRIPTOR_FN,
protobuf_crate_path(customize),
D::TYPE_NAME,
);
w.def_fn(&sig, |w| {
let expr = format!(
"{}.{}(\"{}\").unwrap()",
file_descriptor_call_expr(scope),
D::GET_BY_RELATIVE_NAME_NAME,
descriptor.name_to_package()
);
w.lazy_static(
"descriptor",
&format!(
"{}::reflect::{}",
protobuf_crate_path(customize),
D::TYPE_NAME,
),
&protobuf_crate_path(customize).to_string(),
);
w.write_line(&format!("descriptor.get(|| {}).clone()", expr));
});
}
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