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use std::iter;
use crate::descriptor::field_descriptor_proto;
use crate::descriptor::DescriptorProto;
use crate::descriptor::EnumDescriptorProto;
use crate::descriptor::FieldDescriptorProto;
use crate::descriptor::FileDescriptorProto;
use crate::reflect::field::index::ForwardRuntimeFieldType;
use crate::reflect::field::index::ForwardRuntimeTypeBox;
use crate::reflect::file::index::FileIndex;
use crate::reflect::find_message_or_enum::find_message_or_enum;
use crate::reflect::find_message_or_enum::MessageOrEnum;
use crate::reflect::name::protobuf_name_starts_with_package;
use crate::reflect::runtime_type_box::RuntimeTypeBox;
use crate::reflect::FileDescriptor;
pub(crate) struct FileDescriptorBuilding<'a> {
pub current_file_descriptor: &'a FileDescriptorProto,
pub current_file_index: &'a FileIndex,
pub deps_with_public: &'a [FileDescriptor],
}
impl<'a> FileDescriptorBuilding<'a> {
fn all_descriptors(&self) -> impl Iterator<Item = &'a FileDescriptorProto> {
iter::once(self.current_file_descriptor)
.chain(self.deps_with_public.iter().map(|d| d.proto()))
}
pub fn find_enum(&self, full_name: &str) -> &'a EnumDescriptorProto {
assert!(full_name.starts_with("."));
for file in self.all_descriptors() {
if let Some(name_to_package) =
protobuf_name_starts_with_package(full_name, file.get_package())
{
if let Some((_, me)) = find_message_or_enum(file, name_to_package) {
match me {
MessageOrEnum::Enum(e) => return e,
MessageOrEnum::Message(_) => panic!("not an enum: {}", full_name),
}
}
}
}
panic!(
"enum not found: {}, in files: {}",
full_name,
self.all_files_str()
);
}
fn all_files_str(&self) -> String {
self.all_descriptors()
.map(|d| d.get_name())
.collect::<Vec<_>>()
.join(", ")
}
pub fn resolve_field_type(&self, field: &FieldDescriptorProto) -> ForwardRuntimeFieldType {
match field.get_label() {
field_descriptor_proto::Label::LABEL_OPTIONAL
| field_descriptor_proto::Label::LABEL_REQUIRED => {
ForwardRuntimeFieldType::Singular(self.resolve_field_element_type(field))
}
field_descriptor_proto::Label::LABEL_REPEATED => {
let element = self.resolve_field_element_type(field);
let type_proto = match &element {
ForwardRuntimeTypeBox::CurrentFileMessage(m) => Some(
self.current_file_index.messages[*m]
.path
.eval(self.current_file_descriptor)
.unwrap(),
),
ForwardRuntimeTypeBox::RuntimeTypeBox(RuntimeTypeBox::Message(m)) => {
Some(m.get_proto())
}
_ => None,
};
match type_proto {
Some(m) if m.options.get_or_default().get_map_entry() => self.map_field(m),
_ => ForwardRuntimeFieldType::Repeated(element),
}
}
}
}
fn resolve_field_element_type(&self, field: &FieldDescriptorProto) -> ForwardRuntimeTypeBox {
match field.get_field_type() {
field_descriptor_proto::Type::TYPE_MESSAGE
| field_descriptor_proto::Type::TYPE_GROUP => {
if let Some(name_to_package) = protobuf_name_starts_with_package(
field.get_type_name(),
self.current_file_descriptor.get_package(),
) {
if let Some(index) = self
.current_file_index
.message_by_name_to_package
.get(name_to_package)
{
return ForwardRuntimeTypeBox::CurrentFileMessage(*index);
}
}
for dep in self.deps_with_public {
if let Some(m) = dep.message_by_full_name(field.get_type_name()) {
return ForwardRuntimeTypeBox::RuntimeTypeBox(RuntimeTypeBox::Message(m));
}
}
panic!(
"message not found: {}; files: {}",
field.get_type_name(),
self.all_files_str()
);
}
field_descriptor_proto::Type::TYPE_ENUM => {
if let Some(name_to_package) = protobuf_name_starts_with_package(
field.get_type_name(),
self.current_file_descriptor.get_package(),
) {
if let Some(index) = self
.current_file_index
.enums_by_name_to_package
.get(name_to_package)
{
return ForwardRuntimeTypeBox::CurrentFileEnum(*index);
}
}
for dep in self.deps_with_public {
if let Some(m) = dep.enum_by_full_name(field.get_type_name()) {
return ForwardRuntimeTypeBox::RuntimeTypeBox(RuntimeTypeBox::Enum(m));
}
}
panic!(
"enum not found: {}; files: {}",
field.get_type_name(),
self.all_files_str()
);
}
t => ForwardRuntimeTypeBox::RuntimeTypeBox(RuntimeTypeBox::from_proto_type(t)),
}
}
fn map_field(&self, type_proto: &DescriptorProto) -> ForwardRuntimeFieldType {
assert!(type_proto.get_name().ends_with("Entry"));
assert_eq!(0, type_proto.extension.len());
assert_eq!(0, type_proto.extension_range.len());
assert_eq!(0, type_proto.nested_type.len());
assert_eq!(0, type_proto.enum_type.len());
assert_eq!(2, type_proto.field.len());
let key = &type_proto.field[0];
let value = &type_proto.field[1];
assert_eq!("key", key.get_name());
assert_eq!("value", value.get_name());
assert_eq!(1, key.get_number());
assert_eq!(2, value.get_number());
assert_eq!(
field_descriptor_proto::Label::LABEL_OPTIONAL,
key.get_label()
);
assert_eq!(
field_descriptor_proto::Label::LABEL_OPTIONAL,
value.get_label()
);
let key = self.resolve_field_element_type(key);
let value = self.resolve_field_element_type(value);
ForwardRuntimeFieldType::Map(key, value)
}
}