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feat: implement basic features

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naskya 2024-07-15 18:47:47 +09:00
parent 527779fae7
commit 7a5609577b
Signed by: naskya
GPG key ID: 712D413B3A9FED5C
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/target

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "proc-macro2"
version = "1.0.86"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
dependencies = [
"unicode-ident",
]
[[package]]
name = "quote"
version = "1.0.36"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
dependencies = [
"proc-macro2",
]
[[package]]
name = "relax"
version = "0.1.0-alpha.1"
dependencies = [
"relax-macros",
]
[[package]]
name = "relax-macros"
version = "0.1.0-alpha.1"
dependencies = [
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "syn"
version = "2.0.71"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b146dcf730474b4bcd16c311627b31ede9ab149045db4d6088b3becaea046462"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
]
[[package]]
name = "unicode-ident"
version = "1.0.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

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Cargo.toml Normal file
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[workspace]
members = ["crates/relax", "crates/relax-macros"]
resolver = "2"
[workspace.package]
edition = "2021"
rust-version = "1.74.0"
[workspace.dependencies]
relax-macros = { path = "crates/relax-macros" }
syn = { version = "2.0.70", features = ["full"] }
quote = "1.0.36"
proc-macro2 = "1.0.86"
[profile.release]
lto = true

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## License
Licensed under either of
* MIT license
([LICENSE-MIT](./LICENSE-MIT) or https://opensource.org/licenses/MIT)
* Apache License, Version 2.0
([LICENSE-APACHE](./LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
at your option.
### Contribution
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.

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crates/relax-macros/Cargo.toml Normal file
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[package]
name = "relax-macros"
version = "0.1.0-alpha.1"
license = "MIT OR Apache-2.0"
edition = { workspace = true }
rust-version = { workspace = true }
[lib]
proc-macro = true
[dependencies]
syn = { workspace = true, features = ["full"] }
quote = { workspace = true }
proc-macro2 = { workspace = true }

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use proc_macro2::{TokenStream, TokenTree};
use quote::{quote, ToTokens};
use syn::{parse_macro_input, spanned::Spanned};
#[proc_macro_derive(Relax, attributes(relax))]
pub fn derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
derive_impl(parse_macro_input!(input)).unwrap().into()
}
fn derive_impl(input: syn::DeriveInput) -> syn::Result<TokenStream> {
let orig_attrs: Vec<syn::Attribute> = input.attrs.clone().into_iter().collect();
let relax_attrs: Vec<&syn::Attribute> = orig_attrs
.iter()
.filter(|attr| {
if let syn::Attribute {
meta:
syn::Meta::List(syn::MetaList {
path: syn::Path { segments, .. },
..
}),
..
} = attr
{
if segments.len() != 1 {
return false;
}
matches!(&segments[0], syn::PathSegment { ident, .. } if ident == "relax")
} else {
false
}
})
.collect();
if relax_attrs.is_empty() {
return Err(syn::Error::new_spanned(
input,
"expected #[relax(StructName)] attrubute",
));
}
if relax_attrs.len() > 1 {
return Err(syn::Error::new_spanned(
input,
"expected only one #[relax(StructName)] attrubute on top of the struct",
));
}
let relax_attr = relax_attrs[0];
let mut relax_attr_tokens = match relax_attr {
syn::Attribute {
meta: syn::Meta::List(syn::MetaList { tokens, .. }),
..
} => tokens.clone().into_iter(),
_ => {
return Err(syn::Error::new_spanned(
relax_attr,
"unexpected #[relax(...)] attribute format",
))
}
};
let first_attr: TokenStream = relax_attr_tokens
.next()
.map(|tt| syn::parse2(tt.into_token_stream()))
.transpose()
.ok()
.flatten()
.ok_or(syn::Error::new_spanned(
relax_attr,
"struct name is expected",
))?;
let first_attr_path: syn::Path = syn::parse2(first_attr.clone())?;
let partial: syn::Ident = match first_attr_path {
syn::Path { segments, .. } if segments.len() == 1 => segments[0].ident.to_owned(),
_ => {
return Err(syn::Error::new_spanned(
first_attr,
"struct name is expected",
))
}
};
let partial = syn::Ident::new(&partial.to_string(), first_attr.span());
// consume comma
relax_attr_tokens.next();
let mut extra_attrs = Vec::new();
while let Some(token) = relax_attr_tokens.next() {
// extra attributes are
// * ident + punct
// * ident + group + punct
// * ident (the last one)
let ident: syn::Ident = syn::parse2(token.into_token_stream())?;
// we may have ran out of tokens at this point
let second_item = relax_attr_tokens.next();
if second_item.is_none() {
extra_attrs.push(quote! { #[#ident] });
break;
}
// the second item must be punct or group
let group = match second_item.to_owned().unwrap() {
TokenTree::Punct(_) => {
extra_attrs.push(quote! { #[#ident] });
continue;
}
TokenTree::Group(group) => group,
_ => {
return Err(syn::Error::new_spanned(
second_item,
"expected a comma or parenthesis",
))
}
};
extra_attrs.push(quote! { #[#ident #group] });
}
let fields = match &input.data {
syn::Data::Struct(syn::DataStruct { fields, .. }) => fields,
_ => return Err(syn::Error::new_spanned(input, "expected a struct")),
};
let vis = &input.vis;
let generics = &input.generics;
let partial_fields = fields
.iter()
.map(|field: &syn::Field| {
let name = field.ident.as_ref();
let vis = &field.vis;
let ty = &field.ty;
let relax_attr = field
.attrs
.iter()
.find(|attr| attr.path().is_ident("relax"));
if relax_attr.is_none() {
// not nested
match get_generic_ty("Option", ty) {
Some(ty) => Ok(quote! { #vis #name: ::std::option::Option<#ty> }),
None => Ok(quote! { #vis #name: ::std::option::Option<#ty> }),
}
} else {
// nested
let ty = get_ty_name_from_helper_attr(relax_attr.unwrap())?;
Ok(quote! { #vis #name: ::std::option::Option<#ty> })
}
})
.collect::<syn::Result<Vec<_>>>()?;
let base = &input.ident;
let from_fields = fields.iter().map(|field| {
let name = field.ident.as_ref();
let ty = &field.ty;
match get_generic_ty("Option", ty) {
Some(_) => quote! { #name: value.#name.map(|v| v.into()) },
None => quote! { #name: ::std::option::Option::Some(value.#name.into()) },
}
});
let try_from_fields = fields.iter().map(|field| -> syn::Result<TokenStream> {
let name = field.ident.as_ref();
let ty = &field.ty;
let relaxed_ty = field
.attrs
.iter()
.find(|attr| attr.path().is_ident("relax"))
.map(get_ty_name_from_helper_attr)
.transpose()?;
Ok(match (relaxed_ty, get_generic_ty("Option", ty)) {
(None, None) => quote! { #name: value.#name.ok_or(::relax::RequiredFieldNotSet(stringify!(#name)))? },
(None, Some(_)) => quote! { #name: value.#name },
(Some(_), None) => quote! { #name: value.#name.ok_or(::relax::RequiredFieldNotSet(stringify!(#name)))?.try_into()? },
(Some(_), Some(_)) => quote! { #name: value.#name.map(|val| val.try_into()).transpose().ok().flatten() },
})
}).collect::<syn::Result<Vec<_>>>()?;
let merge_fields = fields.iter().map(|field| {
let name = field.ident.as_ref();
quote! { #name: self.#name.or(optb.#name) }
});
Ok(quote! {
#(#extra_attrs)*
#vis struct #partial #generics {
#(#partial_fields),*
}
impl #generics ::std::convert::From<#base #generics> for #partial #generics {
fn from(value: #base) -> Self {
Self {
#(#from_fields),*
}
}
}
impl #generics ::std::convert::TryFrom<#partial #generics> for #base #generics {
type Error = ::relax::RequiredFieldNotSet;
fn try_from(value: #partial) -> ::std::result::Result<Self, Self::Error> {
Ok(Self{
#(#try_from_fields),*
})
}
}
impl #generics ::relax::Relaxed for #partial #generics {
type Complete = #base #generics;
fn merge(self, optb: Self) -> Self {
Self {
#(#merge_fields),*
}
}
}
impl #generics ::relax::Relax for #base #generics {
type Partial = #partial #generics;
}
})
}
fn get_generic_ty<'a>(wrapper: &str, ty: &'a syn::Type) -> Option<&'a syn::Type> {
if let syn::Type::Path(path) = ty {
let last_segment = path.path.segments.iter().last().unwrap();
if last_segment.ident != wrapper {
return None;
}
let generic_arg = match &last_segment.arguments {
syn::PathArguments::AngleBracketed(inner) if inner.args.len() == 1 => &inner.args[0],
_ => return None,
};
match generic_arg {
syn::GenericArgument::Type(ty) => Some(ty),
_ => None,
}
} else {
None
}
}
fn get_ty_name_from_helper_attr(attr: &syn::Attribute) -> syn::Result<TokenTree> {
let tokens = match attr {
syn::Attribute {
meta: syn::Meta::List(syn::MetaList { ref tokens, .. }),
..
} => tokens,
_ => {
return Err(syn::Error::new_spanned(
attr,
"helper attribute should be #[relax(StructName)]",
))
}
};
let tokens: Vec<TokenTree> = tokens.clone().into_iter().collect();
if tokens.len() != 1 {
return Err(syn::Error::new_spanned(
attr,
"helper attribute should be #[relax(StructName)]",
));
}
Ok(tokens[0].to_owned())
}

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[package]
name = "relax"
version = "0.1.0-alpha.1"
license = "MIT OR Apache-2.0"
edition = { workspace = true }
rust-version = { workspace = true }
[features]
default = ["macros"]
macros = ["dep:relax-macros"]
[lib]
crate-type = ["lib"]
[dependencies]
relax-macros = { workspace = true, optional = true }

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crates/relax/src/lib.rs Normal file
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#[cfg(feature = "macros")]
pub use relax_macros::Relax;
use std::convert::{From, TryFrom};
pub trait Relax: TryFrom<Self::Partial, Error = RequiredFieldNotSet> {
type Partial;
}
pub trait Relaxed: From<Self::Complete> {
type Complete;
fn merge(self, optb: Self) -> Self;
}
#[derive(Debug)]
pub struct RequiredFieldNotSet(pub &'static str);
impl std::fmt::Display for RequiredFieldNotSet {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "required field `{}` is not set", self.0)
}
}
impl std::error::Error for RequiredFieldNotSet {}