diff options
Diffstat (limited to 'vendor/time-macros/src/quote.rs')
-rw-r--r-- | vendor/time-macros/src/quote.rs | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/vendor/time-macros/src/quote.rs b/vendor/time-macros/src/quote.rs new file mode 100644 index 0000000..8603f4f --- /dev/null +++ b/vendor/time-macros/src/quote.rs @@ -0,0 +1,138 @@ +macro_rules! quote { + () => (::proc_macro::TokenStream::new()); + ($($x:tt)*) => {{ + let mut ts = ::proc_macro::TokenStream::new(); + let ts_mut = &mut ts; + quote_inner!(ts_mut $($x)*); + ts + }}; +} + +#[cfg(any(feature = "formatting", feature = "parsing"))] +macro_rules! quote_append { + ($ts:ident $($x:tt)*) => {{ + quote_inner!($ts $($x)*); + }}; +} + +macro_rules! quote_group { + ({ $($x:tt)* }) => { + ::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Brace, + quote!($($x)*) + )) + }; +} + +macro_rules! sym { + ($ts:ident $x:tt $y:tt) => { + $ts.extend([ + ::proc_macro::TokenTree::from(::proc_macro::Punct::new( + $x, + ::proc_macro::Spacing::Joint, + )), + ::proc_macro::TokenTree::from(::proc_macro::Punct::new( + $y, + ::proc_macro::Spacing::Alone, + )), + ]); + }; + ($ts:ident $x:tt) => { + $ts.extend([::proc_macro::TokenTree::from(::proc_macro::Punct::new( + $x, + ::proc_macro::Spacing::Alone, + ))]); + }; +} + +#[allow(unused_macro_rules)] // Varies by feature flag combination. +macro_rules! quote_inner { + // Base case + ($ts:ident) => {}; + + // Single or double symbols + ($ts:ident :: $($tail:tt)*) => { sym!($ts ':' ':'); quote_inner!($ts $($tail)*); }; + ($ts:ident : $($tail:tt)*) => { sym!($ts ':'); quote_inner!($ts $($tail)*); }; + ($ts:ident = $($tail:tt)*) => { sym!($ts '='); quote_inner!($ts $($tail)*); }; + ($ts:ident ; $($tail:tt)*) => { sym!($ts ';'); quote_inner!($ts $($tail)*); }; + ($ts:ident , $($tail:tt)*) => { sym!($ts ','); quote_inner!($ts $($tail)*); }; + ($ts:ident . $($tail:tt)*) => { sym!($ts '.'); quote_inner!($ts $($tail)*); }; + ($ts:ident & $($tail:tt)*) => { sym!($ts '&'); quote_inner!($ts $($tail)*); }; + ($ts:ident < $($tail:tt)*) => { sym!($ts '<'); quote_inner!($ts $($tail)*); }; + ($ts:ident >> $($tail:tt)*) => { sym!($ts '>' '>'); quote_inner!($ts $($tail)*); }; + ($ts:ident > $($tail:tt)*) => { sym!($ts '>'); quote_inner!($ts $($tail)*); }; + ($ts:ident -> $($tail:tt)*) => { sym!($ts '-' '>'); quote_inner!($ts $($tail)*); }; + ($ts:ident ? $($tail:tt)*) => { sym!($ts '?'); quote_inner!($ts $($tail)*); }; + ($ts:ident ! $($tail:tt)*) => { sym!($ts '!'); quote_inner!($ts $($tail)*); }; + ($ts:ident | $($tail:tt)*) => { sym!($ts '|'); quote_inner!($ts $($tail)*); }; + ($ts:ident * $($tail:tt)*) => { sym!($ts '*'); quote_inner!($ts $($tail)*); }; + ($ts:ident + $($tail:tt)*) => { sym!($ts '+'); quote_inner!($ts $($tail)*); }; + + // Identifier + ($ts:ident $i:ident $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::from(::proc_macro::Ident::new( + &stringify!($i), + ::proc_macro::Span::mixed_site(), + ))]); + quote_inner!($ts $($tail)*); + }; + + // Literal + ($ts:ident 0 $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::from(::proc_macro::Literal::usize_unsuffixed(0))]); + quote_inner!($ts $($tail)*); + }; + ($ts:ident $l:literal $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::from(::proc_macro::Literal::string(&$l))]); + quote_inner!($ts $($tail)*); + }; + + // Lifetime + ($ts:ident $l:lifetime $($tail:tt)*) => { + $ts.extend([ + ::proc_macro::TokenTree::from( + ::proc_macro::Punct::new('\'', ::proc_macro::Spacing::Joint) + ), + ::proc_macro::TokenTree::from(::proc_macro::Ident::new( + stringify!($l).trim_start_matches(|c| c == '\''), + ::proc_macro::Span::mixed_site(), + )), + ]); + quote_inner!($ts $($tail)*); + }; + + // Groups + ($ts:ident ($($inner:tt)*) $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Parenthesis, + quote!($($inner)*) + ))]); + quote_inner!($ts $($tail)*); + }; + ($ts:ident [$($inner:tt)*] $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Bracket, + quote!($($inner)*) + ))]); + quote_inner!($ts $($tail)*); + }; + ($ts:ident {$($inner:tt)*} $($tail:tt)*) => { + $ts.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Brace, + quote!($($inner)*) + ))]); + quote_inner!($ts $($tail)*); + }; + + // Interpolated values + // TokenTree by default + ($ts:ident #($e:expr) $($tail:tt)*) => { + $ts.extend([$crate::to_tokens::ToTokenTree::into_token_tree($e)]); + quote_inner!($ts $($tail)*); + }; + // Allow a TokenStream by request. It's more expensive, so avoid if possible. + ($ts:ident #S($e:expr) $($tail:tt)*) => { + $crate::to_tokens::ToTokenStream::append_to($e, $ts); + quote_inner!($ts $($tail)*); + }; +} |