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feat: Able to specify default as sync #12

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6 changes: 4 additions & 2 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -40,5 +40,7 @@ async-trait = "0.1"
features = [ "macros", "rt-multi-thread" ]

[features]
default = [ ]
is_sync = [ ]
is_async = []
is_sync = []
default_sync = []
default = []
85 changes: 45 additions & 40 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,15 @@ use crate::{parse::Item, visit::AsyncAwaitRemoval};
mod parse;
mod visit;

#[cfg(all(feature = "is_sync", feature = "is_async"))]
compile_error!("feature \"is_sync\" and feature \"is_async\" cannot be enabled at the same time");

macro_rules! is_async {
() => {
cfg!(feature = "is_async") || !(cfg!(feature = "is_sync") || cfg!(feature = "default_sync"))
};
}

fn convert_async(input: &mut Item, send: bool) -> TokenStream2 {
if send {
match input {
Expand Down Expand Up @@ -346,39 +355,38 @@ fn convert_sync(input: &mut Item) -> TokenStream2 {
#[proc_macro_attribute]
pub fn maybe_async(args: TokenStream, input: TokenStream) -> TokenStream {
let send = match args.to_string().replace(" ", "").as_str() {
"" | "Send" => true,
"?Send" => false,
_ => {
return syn::Error::new(Span::call_site(), "Only accepts `Send` or `?Send`")
.to_compile_error()
.into();
}
"" | "Send" => Some(true),
"?Send" => Some(false),
_ => None,
};

let mut item = parse_macro_input!(input as Item);

let token = if cfg!(feature = "is_sync") {
convert_sync(&mut item)
} else {
convert_async(&mut item, send)
};
token.into()
match (is_async!(), send) {
(true, Some(send)) => {
let mut item = parse_macro_input!(input as Item);
convert_async(&mut item, send).into()
}
(false, _) => {
let mut item = parse_macro_input!(input as Item);
convert_sync(&mut item).into()
}
_ => input,
}
}

/// convert marked async code to async code with `async-trait`
#[proc_macro_attribute]
pub fn must_be_async(args: TokenStream, input: TokenStream) -> TokenStream {
let send = match args.to_string().replace(" ", "").as_str() {
"" | "Send" => true,
"?Send" => false,
_ => {
return syn::Error::new(Span::call_site(), "Only accepts `Send` or `?Send`")
.to_compile_error()
.into();
}
"" | "Send" => Some(true),
"?Send" => Some(false),
_ => None,
};
let mut item = parse_macro_input!(input as Item);
convert_async(&mut item, send).into()
if let Some(send) = send {
let mut item = parse_macro_input!(input as Item);
convert_async(&mut item, send).into()
} else {
input
}
}

/// convert marked async code to sync code
Expand All @@ -395,7 +403,7 @@ pub fn must_be_sync(_args: TokenStream, input: TokenStream) -> TokenStream {
#[proc_macro_attribute]
pub fn sync_impl(_args: TokenStream, input: TokenStream) -> TokenStream {
let input = TokenStream2::from(input);
let token = if cfg!(feature = "is_sync") {
let token = if !is_async!() {
quote!(#input)
} else {
quote!()
Expand All @@ -408,24 +416,21 @@ pub fn sync_impl(_args: TokenStream, input: TokenStream) -> TokenStream {
/// only compiled when `is_sync` feature gate is not set.
/// When `is_sync` is set, marked code is removed.
#[proc_macro_attribute]
pub fn async_impl(args: TokenStream, _input: TokenStream) -> TokenStream {
pub fn async_impl(args: TokenStream, input: TokenStream) -> TokenStream {
let send = match args.to_string().replace(" ", "").as_str() {
"" | "Send" => true,
"?Send" => false,
_ => {
return syn::Error::new(Span::call_site(), "Only accepts `Send` or `?Send`")
.to_compile_error()
.into();
}
"" | "Send" => Some(true),
"?Send" => Some(false),
_ => None,
};

let token = if cfg!(feature = "is_sync") {
quote!()
} else {
let mut item = parse_macro_input!(_input as Item);
convert_async(&mut item, send)
};
token.into()
match (is_async!(), send) {
(true, Some(send)) => {
let mut item = parse_macro_input!(input as Item);
convert_async(&mut item, send).into()
}
(false, _) => quote!().into(),
_ => input,
}
}

macro_rules! match_nested_meta_to_str_lit {
Expand Down