From 15d7309072658800339eaba0491ba87ba6e266b2 Mon Sep 17 00:00:00 2001 From: HampusM Date: Sat, 9 Jul 2022 19:57:10 +0200 Subject: feat: add DI container --- syrette_macros/src/lib.rs | 221 +++++++++++++++++++++ .../src/libs/intertrait_macros/LICENSE-APACHE | 176 ++++++++++++++++ .../src/libs/intertrait_macros/LICENSE-MIT | 17 ++ syrette_macros/src/libs/intertrait_macros/args.rs | 99 +++++++++ .../src/libs/intertrait_macros/gen_caster.rs | 72 +++++++ syrette_macros/src/libs/intertrait_macros/mod.rs | 15 ++ syrette_macros/src/libs/mod.rs | 1 + 7 files changed, 601 insertions(+) create mode 100644 syrette_macros/src/libs/intertrait_macros/LICENSE-APACHE create mode 100644 syrette_macros/src/libs/intertrait_macros/LICENSE-MIT create mode 100644 syrette_macros/src/libs/intertrait_macros/args.rs create mode 100644 syrette_macros/src/libs/intertrait_macros/gen_caster.rs create mode 100644 syrette_macros/src/libs/intertrait_macros/mod.rs create mode 100644 syrette_macros/src/libs/mod.rs (limited to 'syrette_macros/src') diff --git a/syrette_macros/src/lib.rs b/syrette_macros/src/lib.rs index e69de29..3fd8a59 100644 --- a/syrette_macros/src/lib.rs +++ b/syrette_macros/src/lib.rs @@ -0,0 +1,221 @@ +use proc_macro::TokenStream; +use quote::{quote, ToTokens}; +use syn::{ + parse, parse_macro_input, parse_str, punctuated::Punctuated, token::Comma, + AttributeArgs, FnArg, GenericArgument, ImplItem, ItemImpl, Meta, NestedMeta, Path, + PathArguments, Type, TypePath, +}; + +mod libs; + +use libs::intertrait_macros::{ + args::{Casts, Flag, Targets}, + gen_caster::generate_caster, +}; + +const NO_INTERFACE_ARG_ERR_MESSAGE: &str = + "Expected a argument specifying a interface trait"; + +const INVALID_ARG_ERR_MESSAGE: &str = "Invalid argument passed"; + +const INVALID_ITEM_TYPE_ERR_MESSAGE: &str = + "The attached to item is not a trait implementation"; + +const IMPL_NO_NEW_METHOD_ERR_MESSAGE: &str = + "The attached to trait implementation is missing a new method"; + +const IMPL_NEW_METHOD_SELF_PARAM_ERR_MESSAGE: &str = + "The new method of the attached to trait implementation cannot have a self parameter"; + +const IMPL_NEW_METHOD_BOX_PARAMS_ERR_MESSAGE: &str = + "All parameters of the new method of the attached to trait implementation must be std::boxed::Box"; + +fn path_to_string(path: &Path) -> String +{ + return path + .segments + .pairs() + .fold(String::new(), |mut acc, segment_pair| { + let segment_ident = &segment_pair.value().ident; + + acc.push_str(segment_ident.to_string().as_str()); + + let opt_colon_two = segment_pair.punct(); + + match opt_colon_two { + Some(colon_two) => { + acc.push_str(colon_two.to_token_stream().to_string().as_str()) + } + None => {} + } + + acc + }); +} + +fn get_fn_args_has_self(fn_args: &Punctuated) -> bool +{ + return fn_args.iter().any(|arg| match arg { + FnArg::Receiver(_) => true, + &_ => false, + }); +} + +fn get_fn_arg_type_paths(fn_args: &Punctuated) -> Vec +{ + return fn_args.iter().fold(Vec::::new(), |mut acc, arg| { + match arg { + FnArg::Typed(typed_fn_arg) => match typed_fn_arg.ty.as_ref() { + Type::Path(arg_type_path) => acc.push(arg_type_path.clone()), + &_ => {} + }, + FnArg::Receiver(_receiver_fn_arg) => {} + } + + acc + }); +} + +fn get_dependency_types(item_impl: &ItemImpl) -> Vec +{ + let impl_items = &item_impl.items; + + let opt_new_method_impl_item = impl_items.iter().find(|item| match item { + ImplItem::Method(method_item) => method_item.sig.ident == "new", + &_ => false, + }); + + let new_method_impl_item = match opt_new_method_impl_item { + Some(item) => match item { + ImplItem::Method(method_item) => method_item, + &_ => panic!("{}", IMPL_NO_NEW_METHOD_ERR_MESSAGE), + }, + None => panic!("{}", IMPL_NO_NEW_METHOD_ERR_MESSAGE), + }; + + let new_method_inputs = &new_method_impl_item.sig.inputs; + + if get_fn_args_has_self(new_method_inputs) { + panic!("{}", IMPL_NEW_METHOD_SELF_PARAM_ERR_MESSAGE) + } + + let new_method_arg_type_paths = get_fn_arg_type_paths(new_method_inputs); + + return new_method_arg_type_paths.iter().fold( + Vec::::new(), + |mut acc, arg_type_path| { + let arg_type_path_string = path_to_string(&arg_type_path.path); + + if arg_type_path_string != "Box" + && arg_type_path_string != "std::boxed::Box" + && arg_type_path_string != "boxed::Box" + { + panic!("{}", IMPL_NEW_METHOD_BOX_PARAMS_ERR_MESSAGE); + } + + // Assume the type path has a last segment. + // The Box check wouldn't pass if it didn't + let last_path_segment = arg_type_path.path.segments.last().unwrap(); + + match &last_path_segment.arguments { + PathArguments::AngleBracketed(angle_bracketed_generic_args) => { + let generic_args = &angle_bracketed_generic_args.args; + + let opt_first_generic_arg = generic_args.first(); + + // Assume a first generic argument exists because Box requires one + let first_generic_arg = opt_first_generic_arg.as_ref().unwrap(); + + match first_generic_arg { + GenericArgument::Type(first_generic_arg_type) => { + acc.push(first_generic_arg_type.clone()); + } + &_ => {} + } + } + &_ => {} + } + + acc + }, + ); +} + +#[proc_macro_attribute] +pub fn injectable(args_stream: TokenStream, impl_stream: TokenStream) -> TokenStream +{ + let args = parse_macro_input!(args_stream as AttributeArgs); + + if args.is_empty() { + panic!("{}", NO_INTERFACE_ARG_ERR_MESSAGE); + } + + if args.len() > 1 { + panic!("Only a single argument is expected"); + } + + let interface_path = match &args[0] { + NestedMeta::Meta(arg_meta) => match arg_meta { + Meta::Path(path_arg) => path_arg, + &_ => panic!("{}", INVALID_ARG_ERR_MESSAGE), + }, + &_ => panic!("{}", INVALID_ARG_ERR_MESSAGE), + }; + + let item_impl: ItemImpl = match parse(impl_stream) { + Ok(impl_parsed) => impl_parsed, + Err(_) => { + panic!("{}", INVALID_ITEM_TYPE_ERR_MESSAGE) + } + }; + + let self_type = item_impl.self_ty.as_ref(); + + let self_type_path = match self_type { + Type::Path(path_self_type) => path_self_type.path.clone(), + &_ => parse_str("invalid_type").unwrap(), + }; + + let dependency_types = get_dependency_types(&item_impl); + + quote! { + #item_impl + + impl syrette::injectable::Injectable for #self_type_path { + fn resolve( + di_container: &syrette::DIContainer + ) -> error_stack::Result, syrette::injectable::ResolveError> + { + use error_stack::ResultExt; + + return Ok(Box::new(Self::new( + #(di_container.get::<#dependency_types>() + .change_context(syrette::injectable::ResolveError) + .attach_printable(format!( + "Unable to resolve a dependency of {}", + std::any::type_name::<#self_type_path>() + ))?, + )* + ))); + } + } + + syrette::castable_to!(#self_type_path => #interface_path); + } + .into() +} + +#[proc_macro] +pub fn castable_to(input: TokenStream) -> TokenStream +{ + let Casts { + ty, + targets: Targets { flags, paths }, + } = parse_macro_input!(input); + + paths + .iter() + .map(|t| generate_caster(&ty, t, flags.contains(&Flag::Sync))) + .collect::() + .into() +} diff --git a/syrette_macros/src/libs/intertrait_macros/LICENSE-APACHE b/syrette_macros/src/libs/intertrait_macros/LICENSE-APACHE new file mode 100644 index 0000000..d9a10c0 --- /dev/null +++ b/syrette_macros/src/libs/intertrait_macros/LICENSE-APACHE @@ -0,0 +1,176 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/syrette_macros/src/libs/intertrait_macros/args.rs b/syrette_macros/src/libs/intertrait_macros/args.rs new file mode 100644 index 0000000..d576ae2 --- /dev/null +++ b/syrette_macros/src/libs/intertrait_macros/args.rs @@ -0,0 +1,99 @@ +/** + * Originally from Intertrait by CodeChain + * + * https://github.com/CodeChain-io/intertrait + * https://crates.io/crates/intertrait/0.2.2 + * + * Licensed under either of + * + * Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) + + * at your option. +*/ +use std::collections::HashSet; + +use syn::bracketed; +use syn::parse::{Parse, ParseStream, Result}; +use syn::punctuated::Punctuated; +use syn::{Error, Ident, Path, Token, Type}; + +#[derive(Hash, PartialEq, Eq)] +pub enum Flag +{ + Sync, +} + +impl Flag +{ + fn from(ident: &Ident) -> Result + { + match ident.to_string().as_str() { + "sync" => Ok(Flag::Sync), + unknown => { + let msg = format!("Unknown flag: {}", unknown); + Err(Error::new_spanned(ident, msg)) + } + } + } +} + +pub struct Targets +{ + pub flags: HashSet, + pub paths: Vec, +} + +impl Parse for Targets +{ + fn parse(input: ParseStream) -> Result + { + let mut flags = HashSet::new(); + let mut paths = Vec::new(); + + if input.is_empty() { + return Ok(Targets { flags, paths }); + } + + if input.peek(syn::token::Bracket) { + let content; + bracketed!(content in input); + for ident in Punctuated::::parse_terminated(&content)? { + if !flags.insert(Flag::from(&ident)?) { + let msg = format!("Duplicated flag: {}", ident); + return Err(Error::new_spanned(ident, msg)); + } + } + } + + if input.is_empty() { + return Ok(Targets { flags, paths }); + } + + paths = Punctuated::::parse_terminated(input)? + .into_iter() + .collect(); + + Ok(Targets { flags, paths }) + } +} + +pub struct Casts +{ + pub ty: Type, + pub targets: Targets, +} + +impl Parse for Casts +{ + fn parse(input: ParseStream) -> Result + { + let ty: Type = input.parse()?; + input.parse::]>()?; + + Ok(Casts { + ty, + targets: input.parse()?, + }) + } +} diff --git a/syrette_macros/src/libs/intertrait_macros/gen_caster.rs b/syrette_macros/src/libs/intertrait_macros/gen_caster.rs new file mode 100644 index 0000000..9d177ed --- /dev/null +++ b/syrette_macros/src/libs/intertrait_macros/gen_caster.rs @@ -0,0 +1,72 @@ +/** + * Originally from Intertrait by CodeChain + * + * https://github.com/CodeChain-io/intertrait + * https://crates.io/crates/intertrait/0.2.2 + * + * Licensed under either of + * + * Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) + + * at your option. +*/ +use std::str::from_utf8_unchecked; + +use proc_macro2::TokenStream; +use uuid::adapter::Simple; +use uuid::Uuid; + +use quote::format_ident; +use quote::quote; +use quote::ToTokens; + +pub fn generate_caster( + ty: &impl ToTokens, + trait_: &impl ToTokens, + sync: bool, +) -> TokenStream +{ + let mut fn_buf = [0u8; FN_BUF_LEN]; + let fn_ident = format_ident!("{}", new_fn_name(&mut fn_buf)); + let new_caster = if sync { + quote! { + syrette::libs::intertrait::Caster::::new_sync( + |from| from.downcast_ref::<#ty>().unwrap(), + |from| from.downcast_mut::<#ty>().unwrap(), + |from| from.downcast::<#ty>().unwrap(), + |from| from.downcast::<#ty>().unwrap(), + |from| from.downcast::<#ty>().unwrap() + ) + } + } else { + quote! { + syrette::libs::intertrait::Caster::::new( + |from| from.downcast_ref::<#ty>().unwrap(), + |from| from.downcast_mut::<#ty>().unwrap(), + |from| from.downcast::<#ty>().unwrap(), + |from| from.downcast::<#ty>().unwrap(), + ) + } + }; + + quote! { + #[syrette::libs::linkme::distributed_slice(syrette::libs::intertrait::CASTERS)] + #[linkme(crate = syrette::libs::linkme)] + fn #fn_ident() -> (::std::any::TypeId, syrette::libs::intertrait::BoxedCaster) { + (::std::any::TypeId::of::<#ty>(), Box::new(#new_caster)) + } + } +} + +const FN_PREFIX: &[u8] = b"__"; +const FN_BUF_LEN: usize = FN_PREFIX.len() + Simple::LENGTH; + +fn new_fn_name(buf: &mut [u8]) -> &str +{ + buf[..FN_PREFIX.len()].copy_from_slice(FN_PREFIX); + Uuid::new_v4() + .to_simple() + .encode_lower(&mut buf[FN_PREFIX.len()..]); + unsafe { from_utf8_unchecked(&buf[..FN_BUF_LEN]) } +} diff --git a/syrette_macros/src/libs/intertrait_macros/mod.rs b/syrette_macros/src/libs/intertrait_macros/mod.rs new file mode 100644 index 0000000..7904663 --- /dev/null +++ b/syrette_macros/src/libs/intertrait_macros/mod.rs @@ -0,0 +1,15 @@ +/** + * Originally from Intertrait by CodeChain + * + * https://github.com/CodeChain-io/intertrait + * https://crates.io/crates/intertrait/0.2.2 + * + * Licensed under either of + * + * Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) + + * at your option. +*/ +pub mod args; +pub mod gen_caster; diff --git a/syrette_macros/src/libs/mod.rs b/syrette_macros/src/libs/mod.rs new file mode 100644 index 0000000..e4964de --- /dev/null +++ b/syrette_macros/src/libs/mod.rs @@ -0,0 +1 @@ +pub mod intertrait_macros; -- cgit v1.2.3-18-g5258