diff --git a/build.rs b/build.rs index 38404967..b69d813f 100644 --- a/build.rs +++ b/build.rs @@ -111,7 +111,10 @@ fn main() { println!("cargo:rustc-cfg=wrap_proc_macro"); } - if version.nightly && feature_allowed("proc_macro_span") { + if version.nightly + && feature_allowed("proc_macro_span") + && feature_allowed("proc_macro_span_shrink") + { println!("cargo:rustc-cfg=proc_macro_span"); } diff --git a/src/fallback.rs b/src/fallback.rs index 378ef7e9..4c476e5d 100644 --- a/src/fallback.rs +++ b/src/fallback.rs @@ -512,6 +512,26 @@ impl Span { }) } + #[cfg(procmacro2_semver_exempt)] + pub fn before(&self) -> Span { + Span { + #[cfg(span_locations)] + lo: self.lo, + #[cfg(span_locations)] + hi: self.lo, + } + } + + #[cfg(procmacro2_semver_exempt)] + pub fn after(&self) -> Span { + Span { + #[cfg(span_locations)] + lo: self.hi, + #[cfg(span_locations)] + hi: self.hi, + } + } + #[cfg(not(span_locations))] pub fn join(&self, _other: Span) -> Option { Some(Span {}) diff --git a/src/lib.rs b/src/lib.rs index be5aa511..66bab015 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -87,7 +87,10 @@ // Proc-macro2 types in rustdoc of other crates get linked to here. #![doc(html_root_url = "https://docs.rs/proc-macro2/1.0.43")] -#![cfg_attr(any(proc_macro_span, super_unstable), feature(proc_macro_span))] +#![cfg_attr( + any(proc_macro_span, super_unstable), + feature(proc_macro_span, proc_macro_span_shrink) +)] #![cfg_attr(super_unstable, feature(proc_macro_def_site))] #![cfg_attr(doc_cfg, feature(doc_cfg))] #![allow( @@ -509,6 +512,24 @@ impl Span { LineColumn { line, column } } + /// Creates an empty span pointing to directly before this span. + /// + /// This method is semver exempt and not exposed by default. + #[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))] + #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))] + pub fn before(&self) -> Span { + Span::_new(self.inner.before()) + } + + /// Creates an empty span pointing to directly after this span. + /// + /// This method is semver exempt and not exposed by default. + #[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))] + #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))] + pub fn after(&self) -> Span { + Span::_new(self.inner.after()) + } + /// Create a new span encompassing `self` and `other`. /// /// Returns `None` if `self` and `other` are from different files. diff --git a/src/wrapper.rs b/src/wrapper.rs index 93444013..47d14947 100644 --- a/src/wrapper.rs +++ b/src/wrapper.rs @@ -505,6 +505,22 @@ impl Span { } } + #[cfg(super_unstable)] + pub fn before(&self) -> Span { + match self { + Span::Compiler(s) => Span::Compiler(s.before()), + Span::Fallback(s) => Span::Fallback(s.before()), + } + } + + #[cfg(super_unstable)] + pub fn after(&self) -> Span { + match self { + Span::Compiler(s) => Span::Compiler(s.after()), + Span::Fallback(s) => Span::Fallback(s.after()), + } + } + pub fn join(&self, other: Span) -> Option { let ret = match (self, other) { #[cfg(proc_macro_span)]