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implement handling #[cfg] and #[cfg_attr] in proc macro inputs

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Jacob Lifshay 2024-12-27 04:02:39 -08:00
parent 2ab8428062
commit 7005fa3330
Signed by: programmerjake
SSH key fingerprint: SHA256:HnFTLGpSm4Q4Fj502oCFisjZSoakwEuTsJJMSke63RQ
3 changed files with 2929 additions and 11 deletions
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50
crates/fayalite/src/lib.rs
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@ -11,6 +11,56 @@ extern crate self as fayalite;
#[doc(hidden)]
pub use std as __std;
#[doc(hidden)]
#[macro_export]
macro_rules! __cfg_expansion_helper {
(
[
$($evaluated_cfgs:ident($($evaluated_exprs:tt)*) = $evaluated_results:ident,)*
]
[
$cfg:ident($($expr:tt)*),
$($unevaluated_cfgs:ident($($unevaluated_exprs:tt)*),)*
]
#[$after_evaluation:path:($($after_evaluation_attr_args:tt)*)] {$($after_evaluation_args:tt)*}
) => {
#[$cfg($($expr)*)]
$crate::__cfg_expansion_helper! {
[
$($evaluated_cfgs($($evaluated_exprs)*) = $evaluated_results,)*
$cfg($($expr)*) = true,
]
[
$($unevaluated_cfgs($($unevaluated_exprs)*),)*
]
#[$after_evaluation:($($after_evaluation_attr_args)*)] {$($after_evaluation_args)*}
}
#[$cfg(not($($expr)*))]
$crate::__cfg_expansion_helper! {
[
$($evaluated_cfgs($($evaluated_exprs)*) = $evaluated_results,)*
$cfg($($expr)*) = false,
]
[
$($unevaluated_cfgs($($unevaluated_exprs)*),)*
]
#[$after_evaluation:($($after_evaluation_attr_args)*)] {$($after_evaluation_args)*}
}
};
(
[
$($evaluated_cfgs:ident($($evaluated_exprs:tt)*) = $evaluated_results:ident,)*
]
[]
#[$after_evaluation:path:($($after_evaluation_attr_args:tt)*)] {$($after_evaluation_args:tt)*}
) => {
#[$after_evaluation([
$($evaluated_cfgs($($evaluated_exprs)*) = $evaluated_results,)*
] $($after_evaluation_attr_args)*)]
$($after_evaluation_args)*
};
}
#[doc(inline)]
/// The `#[hdl_module]` attribute is applied to a Rust function so that that function creates
/// a [`Module`][`::fayalite::module::Module`] when called.