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derive_struct.rs
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use crate::attribute::{ContainerAttributes, FieldAttributes};
use virtue::prelude::*;
pub(crate) struct DeriveStruct {
pub fields: Option<Fields>,
pub attributes: ContainerAttributes,
}
impl DeriveStruct {
pub fn generate_encode(self, generator: &mut Generator) -> Result<()> {
let crate_name = &self.attributes.crate_name;
generator
.impl_for(format!("{}::Encode", crate_name))
.modify_generic_constraints(|generics, where_constraints| {
if let Some((bounds, lit)) =
(self.attributes.encode_bounds.as_ref()).or(self.attributes.bounds.as_ref())
{
where_constraints.clear();
where_constraints
.push_parsed_constraint(bounds)
.map_err(|e| e.with_span(lit.span()))?;
} else {
for g in generics.iter_generics() {
where_constraints
.push_constraint(g, format!("{}::Encode", crate_name))
.unwrap();
}
}
Ok(())
})?
.generate_fn("encode")
.with_generic_deps("__E", [format!("{}::enc::Encoder", crate_name)])
.with_self_arg(virtue::generate::FnSelfArg::RefSelf)
.with_arg("encoder", "&mut __E")
.with_return_type(format!(
"core::result::Result<(), {}::error::EncodeError>",
crate_name
))
.body(|fn_body| {
if let Some(fields) = self.fields.as_ref() {
for field in fields.names() {
let attributes = field
.attributes()
.get_attribute::<FieldAttributes>()?
.unwrap_or_default();
if attributes.with_serde {
fn_body.push_parsed(format!(
"{0}::Encode::encode(&{0}::serde::Compat(&self.{1}), encoder)?;",
crate_name, field
))?;
} else {
fn_body.push_parsed(format!(
"{}::Encode::encode(&self.{}, encoder)?;",
crate_name, 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 crate_name = &self.attributes.crate_name;
let decode_context = if let Some((decode_context, _)) = &self.attributes.decode_context {
decode_context.as_str()
} else {
"__Context"
};
let mut impl_for = generator.impl_for(format!("{}::Decode", crate_name));
if self.attributes.decode_context.is_none() {
impl_for = impl_for.with_impl_generics(["__Context"]);
}
impl_for
.with_trait_generics([decode_context])
.modify_generic_constraints(|generics, where_constraints| {
if let Some((bounds, lit)) = (self.attributes.decode_bounds.as_ref()).or(self.attributes.bounds.as_ref()) {
where_constraints.clear();
where_constraints.push_parsed_constraint(bounds).map_err(|e| e.with_span(lit.span()))?;
} else {
for g in generics.iter_generics() {
where_constraints.push_constraint(g, format!("{}::Decode<{}>", crate_name, decode_context)).unwrap();
}
}
Ok(())
})?
.generate_fn("decode")
.with_generic_deps("__D", [format!("{}::de::Decoder<Context = {}>", crate_name, decode_context)])
.with_arg("decoder", "&mut __D")
.with_return_type(format!("core::result::Result<Self, {}::error::DecodeError>", crate_name))
.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(decoder)?,
// b: bincode::Decode::decode(decoder)?,
// ...
// }
if let Some(fields) = self.fields.as_ref() {
for field in fields.names() {
let attributes = field.attributes().get_attribute::<FieldAttributes>()?.unwrap_or_default();
if attributes.with_serde {
struct_body
.push_parsed(format!(
"{1}: (<{0}::serde::Compat<_> as {0}::Decode::<{2}>>::decode(decoder)?).0,",
crate_name,
field,
decode_context,
))?;
} else {
struct_body
.push_parsed(format!(
"{1}: {0}::Decode::decode(decoder)?,",
crate_name,
field
))?;
}
}
}
Ok(())
})?;
Ok(())
})?;
Ok(())
})?;
self.generate_borrow_decode(generator)?;
Ok(())
}
pub fn generate_borrow_decode(self, generator: &mut Generator) -> Result<()> {
// Remember to keep this mostly in sync with generate_decode
let crate_name = self.attributes.crate_name;
let decode_context = if let Some((decode_context, _)) = &self.attributes.decode_context {
decode_context.as_str()
} else {
"__Context"
};
let mut impl_for = generator
.impl_for_with_lifetimes(format!("{}::BorrowDecode", crate_name), ["__de"])
.with_trait_generics([decode_context]);
if self.attributes.decode_context.is_none() {
impl_for = impl_for.with_impl_generics(["__Context"]);
}
impl_for
.modify_generic_constraints(|generics, where_constraints| {
if let Some((bounds, lit)) = (self.attributes.borrow_decode_bounds.as_ref()).or(self.attributes.bounds.as_ref()) {
where_constraints.clear();
where_constraints.push_parsed_constraint(bounds).map_err(|e| e.with_span(lit.span()))?;
} else {
for g in generics.iter_generics() {
where_constraints.push_constraint(g, format!("{}::de::BorrowDecode<'__de, {}>", crate_name, decode_context)).unwrap();
}
for lt in generics.iter_lifetimes() {
where_constraints.push_parsed_constraint(format!("'__de: '{}", lt.ident))?;
}
}
Ok(())
})?
.generate_fn("borrow_decode")
.with_generic_deps("__D", [format!("{}::de::BorrowDecoder<'__de, Context = {}>", crate_name, decode_context)])
.with_arg("decoder", "&mut __D")
.with_return_type(format!("core::result::Result<Self, {}::error::DecodeError>", crate_name))
.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| {
if let Some(fields) = self.fields.as_ref() {
for field in fields.names() {
let attributes = field.attributes().get_attribute::<FieldAttributes>()?.unwrap_or_default();
if attributes.with_serde {
struct_body
.push_parsed(format!(
"{1}: (<{0}::serde::BorrowCompat<_> as {0}::BorrowDecode::<'_, {2}>>::borrow_decode(decoder)?).0,",
crate_name,
field,
decode_context,
))?;
} else {
struct_body
.push_parsed(format!(
"{1}: {0}::BorrowDecode::<'_, {2}>::borrow_decode(decoder)?,",
crate_name,
field,
decode_context,
))?;
}
}
}
Ok(())
})?;
Ok(())
})?;
Ok(())
})?;
Ok(())
}
}