diff options
Diffstat (limited to 'vendor/time-macros/src/shim.rs')
-rw-r--r-- | vendor/time-macros/src/shim.rs | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/vendor/time-macros/src/shim.rs b/vendor/time-macros/src/shim.rs new file mode 100644 index 000000000..f31e5d501 --- /dev/null +++ b/vendor/time-macros/src/shim.rs @@ -0,0 +1,117 @@ +#![allow(unused_macros)] + +// The following code is copyright 2016 Alex Burka. Available under the MIT OR Apache-2.0 license. +// Some adaptations have been made to the original code. + +pub(crate) enum LetElseBodyMustDiverge {} + +#[allow(clippy::missing_docs_in_private_items)] +macro_rules! __guard_output { + ((($($imms:ident)*) ($($muts:ident)*)), + [($($pattern:tt)*) ($rhs:expr) ($diverge:expr)]) => { + __guard_impl!(@as_stmt + let ($($imms,)* $(mut $muts,)*) = { + #[allow(unused_mut)] + match $rhs { + $($pattern)* => { + ($($imms,)* $($muts,)*) + }, + _ => { + let _: $crate::shim::LetElseBodyMustDiverge = $diverge; + }, + } + } + ) + }; +} + +macro_rules! __guard_impl { + (@as_stmt $s:stmt) => { $s }; + (@collect () -> $($rest:tt)*) => { + __guard_output!($($rest)*) + }; + (@collect (($($inside:tt)*) $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($inside)* $($tail)*) -> $idents, $thru) + }; + (@collect ({$($inside:tt)*} $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($inside)* $($tail)*) -> $idents, $thru) + }; + (@collect ([$($inside:tt)*] $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($inside)* $($tail)*) -> $idents, $thru) + }; + (@collect (, $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (.. $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (@ $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (_ $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (& $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (:: <$($generic:tt),*> $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (:: $pathend:ident $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect (| $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect () -> $idents, $thru) + }; + (@collect ($id:ident: $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect ($pathcomp:ident :: $pathend:ident $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> $idents, $thru) + }; + (@collect ($id:ident ($($inside:tt)*) $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($inside)* $($tail)*) -> $idents, $thru) + }; + (@collect ($id:ident {$($inside:tt)*} $($tail:tt)*) -> $idents:tt, $thru:tt) => { + __guard_impl!(@collect ($($inside)* $($tail)*) -> $idents, $thru) + }; + (@collect (ref mut $id:ident $($tail:tt)*) -> (($($imms:ident)*) $muts:tt), $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> (($($imms)* $id) $muts), $thru) + }; + (@collect (ref $id:ident $($tail:tt)*) -> (($($imms:ident)*) $muts:tt), $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> (($($imms)* $id) $muts), $thru) + }; + (@collect (mut $id:ident $($tail:tt)*) -> ($imms:tt ($($muts:ident)*)), $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> ($imms ($($muts)* $id)), $thru) + }; + (@collect ($id:ident $($tail:tt)*) -> (($($imms:ident)*) $muts:tt), $thru:tt) => { + __guard_impl!(@collect ($($tail)*) -> (($($imms)* $id) $muts), $thru) + }; + (@split (else { $($diverge:tt)* } = $($tail:tt)*) -> ($pat:tt)) => { + __guard_impl!(@collect $pat -> (() ()), [$pat ($($tail)*) ({ $($diverge)* })]) + }; + (@split (= $($tail:tt)*) -> ($pat:tt)) => { + __guard_impl!(@split expr ($($tail)*) -> ($pat ())) + }; + (@split ($head:tt $($tail:tt)*) -> (($($pat:tt)*))) => { + __guard_impl!(@split ($($tail)*) -> (($($pat)* $head))) + }; + (@split expr (else { $($tail:tt)* }) -> ($pat:tt $expr:tt)) => { + __guard_impl!(@collect $pat -> (() ()), [$pat $expr ({ $($tail)* })]) + }; + (@split expr (else { $($body:tt)* } $($tail:tt)*) -> ($pat:tt ($($expr:tt)*))) => { + __guard_impl!(@split expr ($($tail)*) -> ($pat ($($expr)* else { $($body)* }))) + }; + (@split expr ($head:tt $($tail:tt)*) -> ($pat:tt ($($expr:tt)*))) => { + __guard_impl!(@split expr ($($tail)*) -> ($pat ($($expr)* $head))) + }; + (let $($tail:tt)*) => { + __guard_impl!(@split ($($tail)*) -> (())) + }; +} + +macro_rules! guard { + ($($input:tt)*) => { + __guard_impl!($($input)*) + }; +} |