bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/span/src/lib.rs')
-rw-r--r--crates/span/src/lib.rs27
1 files changed, 27 insertions, 0 deletions
diff --git a/crates/span/src/lib.rs b/crates/span/src/lib.rs
index ae9e038459..cb91f49249 100644
--- a/crates/span/src/lib.rs
+++ b/crates/span/src/lib.rs
@@ -28,6 +28,33 @@ impl Span {
let range = self.range.cover(other.range);
Span { range, ..self }
}
+
+ pub fn join(
+ self,
+ other: Span,
+ differing_anchor: impl FnOnce(Span, Span) -> Option<Span>,
+ ) -> Option<Span> {
+ // We can't modify the span range for fixup spans, those are meaningful to fixup, so just
+ // prefer the non-fixup span.
+ if self.anchor.ast_id == FIXUP_ERASED_FILE_AST_ID_MARKER {
+ return Some(other);
+ }
+ if other.anchor.ast_id == FIXUP_ERASED_FILE_AST_ID_MARKER {
+ return Some(self);
+ }
+ if self.anchor != other.anchor {
+ return differing_anchor(self, other);
+ }
+ // Differing context, we can't merge these so prefer the one that's root
+ if self.ctx != other.ctx {
+ if self.ctx.is_root() {
+ return Some(other);
+ } else if other.ctx.is_root() {
+ return Some(self);
+ }
+ }
+ Some(Span { range: self.range.cover(other.range), anchor: other.anchor, ctx: other.ctx })
+ }
}
/// Spans represent a region of code, used by the IDE to be able link macro inputs and outputs