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use super::FieldAttribute;
use virtue::generate::Generator;
use virtue::parse::Fields;
use virtue::prelude::*;
pub struct DeriveStruct {
pub fields: Fields,
}
impl DeriveStruct {
pub fn generate_encode(self, generator: &mut Generator) -> Result<()> {
let DeriveStruct { fields } = self;
generator
.impl_for("bincode::enc::Encode")?
.modify_generic_constraints(|generics, where_constraints| {
for g in generics.iter_generics() {
where_constraints.push_constraint(g, "bincode::enc::Encode").unwrap();
}
})
.generate_fn("encode")
.with_generic("E", ["bincode::enc::Encoder"])
.with_self_arg(virtue::generate::FnSelfArg::RefSelf)
.with_arg("mut encoder", "E")
.with_return_type("core::result::Result<(), bincode::error::EncodeError>")
.body(|fn_body| {
for field in fields.names() {
if field.has_attribute(FieldAttribute::WithSerde)? {
fn_body
.push_parsed(format!(
"bincode::Encode::encode(&bincode::serde::Compat(&self.{}), &mut encoder)?;",
field
))?;
} else {
fn_body
.push_parsed(format!(
"bincode::enc::Encode::encode(&self.{}, &mut encoder)?;",
field
))?;
}
}
fn_body.push_parsed("Ok(())")?;
Ok(())
})?;
Ok(())
}
pub fn generate_decode(self, generator: &mut Generator) -> Result<()> {
// Remember to keep this mostly in sync with generate_borrow_decode
let DeriveStruct { fields } = self;
generator
.impl_for("bincode::Decode")?
.modify_generic_constraints(|generics, where_constraints| {
for g in generics.iter_generics() {
where_constraints.push_constraint(g, "bincode::de::Decode").unwrap();
}
})
.generate_fn("decode")
.with_generic("D", ["bincode::de::Decoder"])
.with_arg("mut decoder", "D")
.with_return_type("core::result::Result<Self, bincode::error::DecodeError>")
.body(|fn_body| {
// Ok(Self {
fn_body.ident_str("Ok");
fn_body.group(Delimiter::Parenthesis, |ok_group| {
ok_group.ident_str("Self");
ok_group.group(Delimiter::Brace, |struct_body| {
// Fields
// {
// a: bincode::Decode::decode(&mut decoder)?,
// b: bincode::Decode::decode(&mut decoder)?,
// ...
// }
for field in fields.names() {
if field.has_attribute(FieldAttribute::WithSerde)? {
struct_body
.push_parsed(format!(
"{}: (<bincode::serde::Compat<_> as bincode::Decode>::decode(&mut decoder)?).0,",
field
))?;
} else {
struct_body
.push_parsed(format!(
"{}: bincode::Decode::decode(&mut decoder)?,",
field
))?;
}
}
Ok(())
})?;
Ok(())
})?;
Ok(())
})?;
Ok(())
}
pub fn generate_borrow_decode(self, generator: &mut Generator) -> Result<()> {
// Remember to keep this mostly in sync with generate_decode
let DeriveStruct { fields } = self;
generator
.impl_for_with_lifetimes("bincode::de::BorrowDecode", &["__de"])?
.modify_generic_constraints(|generics, where_constraints| {
for g in generics.iter_generics() {
where_constraints.push_constraint(g, "bincode::de::BorrowDecode").unwrap();
}
})
.generate_fn("borrow_decode")
.with_generic("D", ["bincode::de::BorrowDecoder<'__de>"])
.with_arg("mut decoder", "D")
.with_return_type("core::result::Result<Self, bincode::error::DecodeError>")
.body(|fn_body| {
// Ok(Self {
fn_body.ident_str("Ok");
fn_body.group(Delimiter::Parenthesis, |ok_group| {
ok_group.ident_str("Self");
ok_group.group(Delimiter::Brace, |struct_body| {
for field in fields.names() {
if field.has_attribute(FieldAttribute::WithSerde)? {
struct_body
.push_parsed(format!(
"{}: (<bincode::serde::BorrowCompat<_> as bincode::de::BorrowDecode>::borrow_decode(&mut decoder)?).0,",
field
))?;
} else {
struct_body
.push_parsed(format!(
"{}: bincode::de::BorrowDecode::borrow_decode(&mut decoder)?,",
field
))?;
}
}
Ok(())
})?;
Ok(())
})?;
Ok(())
})?;
Ok(())
}
}