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Nicolas Stalder
2020-01-11 20:47:51 +01:00
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.gitignore
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/target
**/*.rs.bk
Cargo.lock
Cargo.toml
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[package]
name = "serde-indexed"
version = "0.0.0-unreleased"
authors = ["Nicolas Stalder <n@stalder.io>"]
license = "MIT OR Apache-2.0"
description = "Derive Serialize and Deserialize that replaces struct keys with numerical indices."
repository = "https://github.com/nickray/serde-indexed"
readme = "README.md"
edition = "2018"
[lib]
proc-macro = true
[dependencies]
proc-macro2 = "1.0"
quote = "1.0"
syn = "1.0"
[dev-dependencies]
# heapless = "0.5.1"
# rustversion = "1.0"
serde = "1.0"
serde_cbor = "0.11.0"
# trybuild = { version = "1.0.19", features = ["diff"] }
LICENSE-APACHE
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LICENSE-MIT
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Copyright (c) 2020 Nicolas Stalder
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README.md
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## Overview
Derive Serialize and Deserialize that replaces struct keys with numerical indices.
Supports `skip_serializing_if` for optional keys.
**WIP**. Use case is to handle CTAP CBOR messages.
This is my attempt to learn and use using proc-macros,
I'm following along with [`serde-repr`][serde-repr].
To "see" the generated code, run `cargo expand --test basics`.
[serde-repr]: https://github.com/dtolnay/serde-repr
#### License
<sup>`serde-indexed` is licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or [MIT License](LICENSE-MIT) at your option.</sup>
<br>
<sub>Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.</sub>
src/lib.rs
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//! Derive `Serialize` and `Deserialize` that replaces struct keys with numerical indices.
extern crate proc_macro;
mod parse;
use proc_macro::TokenStream;
use quote::quote;
use syn::parse_macro_input;
use crate::parse::Input;
fn serialize_visitor(fields: &[parse::Field], offset: usize) -> Vec<proc_macro2::TokenStream> {
fields
.iter()
.map(|field| {
let index = field.index + offset;
// let label = stringify!(field.label.clone());
let member = &field.member;
quote! {
// TODO: how do I get something like `self.#label` here?
// TODO: what the heck is "member"?
map.serialize_entry(&#index, &self.#member)?;
}
})
.collect()
}
#[proc_macro_derive(SerializeIndexed)]
pub fn derive_serialize(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as Input);
let ident = input.ident;
let num_fields = input.fields.len();
let serialize_fields = serialize_visitor(&input.fields, 1);
TokenStream::from(quote! {
impl serde::Serialize for #ident {
fn serialize<S>(&self, serializer: S) -> core::result::Result<S::Ok, S::Error>
where
S: serde::Serializer
{
// Somehow:
// - serialize_struct takes an identifier
// - serialize_map does *not*
// let mut state = serializer.serialize_struct(stringify!(#ident), #num_fields)?;
use serde::ser::SerializeMap;
let mut map = serializer.serialize_map(Some(#num_fields))?;
#(#serialize_fields)*
map.end()
}
}
})
}
src/parse.rs
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// use syn::parse::{Error, Parse, ParseStream, Parser, Result};
// use syn::{parenthesized, Data, DeriveInput, Fields, Ident, Meta, NestedMeta};
use proc_macro2::Span;
use syn::parse::{Error, Parse, ParseStream, Result};
use syn::{Data, DeriveInput, Fields, Ident};
use syn::Token;
pub struct Input {
pub ident: Ident,
pub fields: Vec<Field>,
}
pub struct Field {
pub label: String,
pub member: syn::Member,
pub index: usize,
// pub attrs: attr::Field,
pub ty: syn::Type,
pub original: syn::Field,
}
impl Parse for Input {
fn parse(input: ParseStream) -> Result<Self> {
let call_site = Span::call_site();
let derive_input = DeriveInput::parse(input)?;
let data: syn::DataStruct = match derive_input.data {
Data::Struct(data) => data,
_ => {
return Err(Error::new(call_site, "input must be a struct"));
}
};
let syn_fields: syn::FieldsNamed = match data.fields {
Fields::Named(named_fields) => named_fields,
_ => {
return Err(Error::new(call_site, "struct fields must be named"));
}
};
let fields = fields_from_ast(&syn_fields.named);
//serde::internals::ast calls `fields_from_ast(cx, &fields.named, attrs, container_default)`
Ok(Input {
ident: derive_input.ident,
fields,
})
}
}
fn fields_from_ast<'a>(
fields: &'a syn::punctuated::Punctuated<syn::Field, Token![,]>,
) -> Vec<Field> {
// serde::internals::ast.rs:L183
fields
.iter()
.enumerate()
.map(|(i, field)| Field {
// these are https://docs.rs/syn/1.0.13/syn/struct.Field.html
label: match &field.ident {
Some(ident) => ident.to_string(),
None => {
// TODO: does this happen?
panic!("input struct must have named fields");
}
},
member: match &field.ident {
Some(ident) => syn::Member::Named(ident.clone()),
None => {
// TODO: does this happen?
panic!("input struct must have named fields");
}
},
index: i,
ty: field.ty.clone(),
original: field.clone(),
})
.collect()
}
tests/basics.rs
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use serde_indexed::{/*DeserializeIndexed,*/ SerializeIndexed};
mod some_keys {
use super::*;
// use heapless::{
// consts,
// String,
// Vec,
// };
// TODO Does this import belong here or in the macro?
// use serde::ser::SerializeMap;
#[derive(Clone, Debug, PartialEq, SerializeIndexed)]
// #[serde_indexed(offset = 1)]
pub struct SomeKeys {
pub number: i32,
pub bytes: [u8; 12],
// pub string: String<consts::U10>,
// pub vector: Vec<u8, consts::U16>,
}
fn an_example() -> SomeKeys {
SomeKeys { number: -7, bytes: [37u8; 12] }
}
// TODO: add some kind of bytes, e.g.
// cbor.dumps({1: -7, 2: bytes([42]*12)}) = b'\xa2\x01&\x02L************'
const SERIALIZED_AN_EXAMPLE: &'static [u8] =
b"\xa2\x01&\x02\x8c\x18%\x18%\x18%\x18%\x18%\x18%\x18%\x18%\x18%\x18%\x18%\x18%";
#[test]
fn test_serialize() {
let sk = an_example();
let mut buffer = [0u8; 1024];
let writer = serde_cbor::ser::SliceWrite::new(&mut buffer);
let mut ser = serde_cbor::Serializer::new(writer);
use serde::ser::Serialize;
// CURRENTLY: stack overflow, as it recursively calls itself
sk.serialize(&mut ser).unwrap();
let writer = ser.into_inner();
let size = writer.bytes_written();
assert_eq!(&buffer[..size], SERIALIZED_AN_EXAMPLE);
}
// #[test]
// fn test_deserialize() {
// let sk = an_example();
// }
}