From 15d7309072658800339eaba0491ba87ba6e266b2 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sat, 9 Jul 2022 19:57:10 +0200
Subject: feat: add DI container
---
syrette_macros/Cargo.toml | 8 +
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 +
8 files changed, 609 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')
diff --git a/syrette_macros/Cargo.toml b/syrette_macros/Cargo.toml
index 0d72785..a6966f0 100644
--- a/syrette_macros/Cargo.toml
+++ b/syrette_macros/Cargo.toml
@@ -6,4 +6,12 @@ authors = ["HampusM <hampus@hampusmat.com>"]
description = "Macros for Syrette, the convenient dependency injection library"
edition = "2021"
+[lib]
+proc_macro = true
+
[dependencies]
+syn = { version = "1.0.96", features = ["full"] }
+quote = "1.0.18"
+proc-macro2 = "1.0.40"
+uuid = { version = "0.8", features = ["v4"] }
+
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<FnArg, Comma>) -> bool
+{
+ return fn_args.iter().any(|arg| match arg {
+ FnArg::Receiver(_) => true,
+ &_ => false,
+ });
+}
+
+fn get_fn_arg_type_paths(fn_args: &Punctuated<FnArg, Comma>) -> Vec<TypePath>
+{
+ return fn_args.iter().fold(Vec::<TypePath>::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<Type>
+{
+ 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::<Type>::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<Box<Self>, 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::<proc_macro2::TokenStream>()
+ .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/
+
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
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+ 6. Trademarks. This License does not grant permission to use the trade
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diff --git a/syrette_macros/src/libs/intertrait_macros/LICENSE-MIT b/syrette_macros/src/libs/intertrait_macros/LICENSE-MIT
new file mode 100644
index 0000000..969d061
--- /dev/null
+++ b/syrette_macros/src/libs/intertrait_macros/LICENSE-MIT
@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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,
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+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<Self>
+ {
+ 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<Flag>,
+ pub paths: Vec<Path>,
+}
+
+impl Parse for Targets
+{
+ fn parse(input: ParseStream) -> Result<Self>
+ {
+ 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::<Ident, Token![,]>::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::<Path, Token![,]>::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<Self>
+ {
+ let ty: Type = input.parse()?;
+ input.parse::<Token![=>]>()?;
+
+ 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::<dyn #trait_>::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::<dyn #trait_>::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;
--
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