refactor on span_look_ahead

Author: chenyukang

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1008,7 +1008,7 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
         span: Span,
     ) {
         if let Some((trait_ref, self_ty)) =
-                self.diagnostic_metadata.currently_processing_impl_trait.clone()
+            self.diagnostic_metadata.currently_processing_impl_trait.clone()
             && let TyKind::Path(_, self_ty_path) = &self_ty.kind
             && let PathResult::Module(ModuleOrUniformRoot::Module(module)) =
                 self.resolve_path(&Segment::from_path(self_ty_path), Some(TypeNS), None)
@@ -1217,15 +1217,15 @@ impl<'a: 'ast, 'ast, 'tcx> LateResolutionVisitor<'a, '_, 'ast, 'tcx> {
         // where a brace being opened means a block is being started. Look
         // ahead for the next text to see if `span` is followed by a `{`.
         let sm = self.r.tcx.sess.source_map();
-        let sp = sm.span_look_ahead(span, None, Some(50));
-        let followed_by_brace = matches!(sm.span_to_snippet(sp), Ok(ref snippet) if snippet == "{");
-        // In case this could be a struct literal that needs to be surrounded
-        // by parentheses, find the appropriate span.
-        let closing_span = sm.span_look_ahead(span, Some("}"), Some(50));
-        let closing_brace: Option<Span> = sm
-            .span_to_snippet(closing_span)
-            .map_or(None, |s| if s == "}" { Some(span.to(closing_span)) } else { None });
-        (followed_by_brace, closing_brace)
+        if let Some(followed_brace_span) = sm.span_look_ahead(span, "{", Some(50)) {
+            // In case this could be a struct literal that needs to be surrounded
+            // by parentheses, find the appropriate span.
+            let close_brace_span = sm.span_look_ahead(followed_brace_span, "}", Some(50));
+            let closing_brace = close_brace_span.map(|sp| span.to(sp));
+            (true, closing_brace)
+        } else {
+            (false, None)
+        }
     }
 
     /// Provides context-dependent help for errors reported by the `smart_resolve_path_fragment`

compiler/rustc_span/src/source_map.rs

@@ -973,24 +973,21 @@ impl SourceMap {
         Span::new(BytePos(start_of_next_point), end_of_next_point, sp.ctxt(), None)
     }
 
-    /// Returns a new span to check next none-whitespace character or some specified expected character
-    /// If `expect` is none, the first span of non-whitespace character is returned.
-    /// If `expect` presented, the first span of the character `expect` is returned
-    /// Otherwise, the span reached to limit is returned.
-    pub fn span_look_ahead(&self, span: Span, expect: Option<&str>, limit: Option<usize>) -> Span {
+    /// Check whether span is followed by some specified expected string in limit scope
+    pub fn span_look_ahead(&self, span: Span, expect: &str, limit: Option<usize>) -> Option<Span> {
         let mut sp = span;
         for _ in 0..limit.unwrap_or(100_usize) {
             sp = self.next_point(sp);
             if let Ok(ref snippet) = self.span_to_snippet(sp) {
-                if expect.is_some_and(|es| snippet == es) {
-                    break;
+                if snippet == expect {
+                    return Some(sp);
                 }
-                if expect.is_none() && snippet.chars().any(|c| !c.is_whitespace()) {
+                if snippet.chars().any(|c| !c.is_whitespace()) {
                     break;
                 }
             }
         }
-        sp
+        None
     }
 
     /// Finds the width of the character, either before or after the end of provided span,

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -1428,20 +1428,18 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
 
                         // Issue #109436, we need to add parentheses properly for method calls
                         // for example, `foo.into()` should be `(&foo).into()`
-                        if let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(
-                            self.tcx.sess.source_map().span_look_ahead(span, Some("."), Some(50)),
-                        ) {
-                            if snippet == "." {
-                                err.multipart_suggestion_verbose(
-                                    sugg_msg,
-                                    vec![
-                                        (span.shrink_to_lo(), format!("({sugg_prefix}")),
-                                        (span.shrink_to_hi(), ")".to_string()),
-                                    ],
-                                    Applicability::MaybeIncorrect,
-                                );
-                                return true;
-                            }
+                        if let Some(_) =
+                            self.tcx.sess.source_map().span_look_ahead(span, ".", Some(50))
+                        {
+                            err.multipart_suggestion_verbose(
+                                sugg_msg,
+                                vec![
+                                    (span.shrink_to_lo(), format!("({sugg_prefix}")),
+                                    (span.shrink_to_hi(), ")".to_string()),
+                                ],
+                                Applicability::MaybeIncorrect,
+                            );
+                            return true;
                         }
 
                         // Issue #104961, we need to add parentheses properly for compound expressions