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|
//! Oneof-related codegen functions.
use std::collections::HashSet;
use code_writer::CodeWriter;
use field::FieldElem;
use field::FieldGen;
use message::MessageGen;
use protobuf::descriptor::FieldDescriptorProto_Type;
use protobuf_name::ProtobufAbsolutePath;
use rust_name::RustIdent;
use rust_types_values::RustType;
use scope::FieldWithContext;
use scope::OneofVariantWithContext;
use scope::OneofWithContext;
use scope::RootScope;
use scope::WithScope;
use serde;
use Customize;
// oneof one { ... }
#[derive(Clone)]
pub(crate) struct OneofField<'a> {
pub elem: FieldElem<'a>,
pub oneof_rust_field_name: RustIdent,
pub oneof_type_name: RustType,
pub boxed: bool,
}
impl<'a> OneofField<'a> {
// Detecting recursion: if oneof fields contains a self-reference
// or another message which has a reference to self,
// put oneof variant into a box.
fn need_boxed(field: &FieldWithContext, root_scope: &RootScope, owner_name: &str) -> bool {
let mut visited_messages = HashSet::new();
let mut fields = vec![field.clone()];
while let Some(field) = fields.pop() {
if field.field.get_field_type() == FieldDescriptorProto_Type::TYPE_MESSAGE {
let message_name = ProtobufAbsolutePath::from(field.field.get_type_name());
if !visited_messages.insert(message_name.clone()) {
continue;
}
if message_name.path == owner_name {
return true;
}
let message = root_scope.find_message(&message_name);
fields.extend(message.fields().into_iter().filter(|f| f.is_oneof()));
}
}
false
}
pub fn parse(
oneof: &OneofWithContext<'a>,
field: &FieldWithContext<'a>,
elem: FieldElem<'a>,
root_scope: &RootScope,
) -> OneofField<'a> {
let boxed = OneofField::need_boxed(field, root_scope, &oneof.message.name_absolute().path);
OneofField {
elem,
boxed,
oneof_rust_field_name: oneof.field_name().into(),
oneof_type_name: RustType::Oneof(oneof.rust_name().to_string()),
}
}
pub fn rust_type(&self) -> RustType {
let t = self.elem.rust_storage_type();
if self.boxed {
RustType::Uniq(Box::new(t))
} else {
t
}
}
}
#[derive(Clone)]
pub(crate) struct OneofVariantGen<'a> {
_oneof: &'a OneofGen<'a>,
_variant: OneofVariantWithContext<'a>,
oneof_field: OneofField<'a>,
pub field: FieldGen<'a>,
path: String,
_customize: Customize,
}
impl<'a> OneofVariantGen<'a> {
fn parse(
oneof: &'a OneofGen<'a>,
variant: OneofVariantWithContext<'a>,
field: &'a FieldGen,
_root_scope: &RootScope,
customize: Customize,
) -> OneofVariantGen<'a> {
OneofVariantGen {
_oneof: oneof,
_variant: variant.clone(),
field: field.clone(),
path: format!(
"{}::{}",
oneof.type_name.to_code(&field.customize),
field.rust_name
),
oneof_field: OneofField::parse(
variant.oneof,
&field.proto_field,
field.oneof().elem.clone(),
oneof.message.root_scope,
),
_customize: customize,
}
}
fn rust_type(&self) -> RustType {
self.oneof_field.rust_type()
}
pub fn path(&self) -> String {
self.path.clone()
}
}
#[derive(Clone)]
pub(crate) struct OneofGen<'a> {
// Message containing this oneof
message: &'a MessageGen<'a>,
pub oneof: OneofWithContext<'a>,
type_name: RustType,
customize: Customize,
}
impl<'a> OneofGen<'a> {
pub fn parse(
message: &'a MessageGen,
oneof: OneofWithContext<'a>,
customize: &Customize,
) -> OneofGen<'a> {
let rust_name = oneof.rust_name();
OneofGen {
message,
oneof,
type_name: RustType::Oneof(rust_name.to_string()),
customize: customize.clone(),
}
}
pub fn variants_except_group(&'a self) -> Vec<OneofVariantGen<'a>> {
self.oneof
.variants()
.into_iter()
.filter_map(|v| {
let field = self
.message
.fields
.iter()
.filter(|f| f.proto_field.name() == v.field.get_name())
.next()
.expect(&format!("field not found by name: {}", v.field.get_name()));
match field.proto_type {
FieldDescriptorProto_Type::TYPE_GROUP => None,
_ => Some(OneofVariantGen::parse(
self,
v,
field,
self.message.root_scope,
self.customize.clone(),
)),
}
})
.collect()
}
pub fn full_storage_type(&self) -> RustType {
RustType::Option(Box::new(self.type_name.clone()))
}
pub fn write_enum(&self, w: &mut CodeWriter) {
let derive = vec!["Clone", "PartialEq", "Debug"];
w.derive(&derive);
serde::write_serde_attr(
w,
&self.customize,
"derive(::serde::Serialize, ::serde::Deserialize)",
);
w.pub_enum(&self.type_name.to_code(&self.customize), |w| {
for variant in self.variants_except_group() {
w.write_line(&format!(
"{}({}),",
variant.field.rust_name,
&variant.rust_type().to_code(&self.customize)
));
}
});
}
}
|
