From 7a5609577be88537770758bae036dc8df550e5e2 Mon Sep 17 00:00:00 2001 From: naskya Date: Mon, 15 Jul 2024 18:47:47 +0900 Subject: [PATCH] feat: implement basic features --- .gitignore | 1 + Cargo.lock | 54 +++++++ Cargo.toml | 17 ++ LICENSE-APACHE | 201 ++++++++++++++++++++++++ LICENSE-MIT | 21 +++ README.md | 14 ++ crates/relax-macros/Cargo.toml | 15 ++ crates/relax-macros/src/lib.rs | 278 +++++++++++++++++++++++++++++++++ crates/relax/Cargo.toml | 17 ++ crates/relax/src/lib.rs | 23 +++ 10 files changed, 641 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 LICENSE-APACHE create mode 100644 LICENSE-MIT create mode 100644 README.md create mode 100644 crates/relax-macros/Cargo.toml create mode 100644 crates/relax-macros/src/lib.rs create mode 100644 crates/relax/Cargo.toml create mode 100644 crates/relax/src/lib.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..bf627b0 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,54 @@ +# 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" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..fc0c181 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,17 @@ +[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 diff --git a/LICENSE-APACHE b/LICENSE-APACHE new file mode 100644 index 0000000..c98d27d --- /dev/null +++ b/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + https://www.apache.org/licenses/LICENSE-2.0 + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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{ #[#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::>>()?; + + 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 { + 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::>>()?; + + 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 { + 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 { + 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 = 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()) +} diff --git a/crates/relax/Cargo.toml b/crates/relax/Cargo.toml new file mode 100644 index 0000000..1faadcc --- /dev/null +++ b/crates/relax/Cargo.toml @@ -0,0 +1,17 @@ +[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 } diff --git a/crates/relax/src/lib.rs b/crates/relax/src/lib.rs new file mode 100644 index 0000000..ee00fc3 --- /dev/null +++ b/crates/relax/src/lib.rs @@ -0,0 +1,23 @@ +#[cfg(feature = "macros")] +pub use relax_macros::Relax; + +use std::convert::{From, TryFrom}; + +pub trait Relax: TryFrom { + type Partial; +} + +pub trait Relaxed: From { + 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 {}