54 lines
1.6 KiB
Rust
54 lines
1.6 KiB
Rust
macro_rules! impl_display {
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(for $ty:ty => $(|$selfty:pat_param|)? $fmt:literal $(, $($param:expr),+)? $(,)?) => {
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impl ::core::fmt::Display for $ty {
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fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
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$(let $selfty = self;)?
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write!(f, $fmt, $($param),*)
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}
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}
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};
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(for $ty:ty => $str:literal) => {
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impl ::core::fmt::Display for $ty {
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fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
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f.write_str($str)
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}
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}
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};
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(for $ty:ty => match {$(
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$bind:pat => $($const:ident)? $fmt:literal $(,$($params:tt)*)?;
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)*}) => {
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impl ::core::fmt::Display for $ty {
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fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
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match self {
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$(
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$bind => $crate::utils::internal::impl_display_match_fragment!($($const,)? f, $fmt $(, $($params)*)?)
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),*
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}
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}
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}
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}
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}
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#[doc(hidden)]
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pub(crate) mod internal {
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macro_rules! impl_display_match_fragment {
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(const, $f:expr, $lit:literal) => {
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$f.write_str($lit)
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};
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($f:expr, $fmt:literal $(, $($params:tt)*)?) => {
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write!($f, $fmt, $($($params)*)?)
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};
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}
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pub(crate) use impl_display_match_fragment;
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}
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macro_rules! static_assert(($expr:expr $(,)?) => {
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const _: [(); !$expr as usize] = [];
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});
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pub(crate) use {impl_display, static_assert};
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