Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
53 lines
1.1 KiB
Rust
53 lines
1.1 KiB
Rust
// SPDX-License-Identifier: Apache-2.0 OR MIT
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use crate::ToTokens;
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use proc_macro2::extra::DelimSpan;
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use proc_macro2::{Span, TokenStream};
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// Not public API other than via the syn crate. Use syn::spanned::Spanned.
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pub trait Spanned: private::Sealed {
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fn __span(&self) -> Span;
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}
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impl Spanned for Span {
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fn __span(&self) -> Span {
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*self
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}
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}
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impl Spanned for DelimSpan {
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fn __span(&self) -> Span {
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self.join()
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}
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}
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impl<T: ?Sized + ToTokens> Spanned for T {
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fn __span(&self) -> Span {
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join_spans(self.into_token_stream())
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}
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}
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fn join_spans(tokens: TokenStream) -> Span {
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let mut iter = tokens.into_iter().map(|tt| tt.span());
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let first = match iter.next() {
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Some(span) => span,
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None => return Span::call_site(),
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};
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iter.fold(None, |_prev, next| Some(next))
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.and_then(|last| first.join(last))
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.unwrap_or(first)
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}
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mod private {
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use crate::ToTokens;
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use proc_macro2::extra::DelimSpan;
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use proc_macro2::Span;
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pub trait Sealed {}
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impl Sealed for Span {}
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impl Sealed for DelimSpan {}
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impl<T: ?Sized + ToTokens> Sealed for T {}
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}
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