added byte position range for proc_macro::Span

Author: michaelvanstraten

proc_macro/src/bridge/mod.rs

@@ -14,6 +14,7 @@ use std::hash::Hash;
 use std::marker;
 use std::mem;
 use std::ops::Bound;
+use std::ops::Range;
 use std::panic;
 use std::sync::atomic::AtomicUsize;
 use std::sync::Once;
@@ -93,6 +94,7 @@ macro_rules! with_api {
                 fn source_file($self: $S::Span) -> $S::SourceFile;
                 fn parent($self: $S::Span) -> Option<$S::Span>;
                 fn source($self: $S::Span) -> $S::Span;
+                fn position($self: $S::Span) -> Range<u32>;
                 fn start($self: $S::Span) -> LineColumn;
                 fn end($self: $S::Span) -> LineColumn;
                 fn before($self: $S::Span) -> $S::Span;
@@ -293,6 +295,7 @@ mark_noop! {
     &'_ str,
     String,
     u8,
+    u32,
     usize,
     Delimiter,
     LitKind,
@@ -519,3 +522,7 @@ pub struct ExpnGlobals<Span> {
 compound_traits!(
     struct ExpnGlobals<Span> { def_site, call_site, mixed_site }
 );
+
+compound_traits!(
+    struct Range<T> { start, end }
+);

proc_macro/src/lib.rs

@@ -44,7 +44,7 @@ mod diagnostic;
 pub use diagnostic::{Diagnostic, Level, MultiSpan};
 
 use std::cmp::Ordering;
-use std::ops::RangeBounds;
+use std::ops::{Range, RangeBounds};
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::{error, fmt, iter};
@@ -488,6 +488,12 @@ impl Span {
         Span(self.0.source())
     }
 
+    /// Returns the spans byte position range in the source file.
+    #[unstable(feature = "proc_macro_span", issue = "54725")]
+    pub fn position(&self) -> Range<u32> {
+        self.0.position()
+    }
+
     /// Gets the starting line/column in the source file for this span.
     #[unstable(feature = "proc_macro_span", issue = "54725")]
     pub fn start(&self) -> LineColumn {