Merge #2810

2810: Improves reference search by StructLiteral r=mikhail-m1 a=mikhail-m1

Hey, I've made some changes to improve search for struct literals, now it works for `struct Foo<|> {`, `struct Foo <|>{`, `struct Foo<|>(`. Unfortunately tuple creation is represented as a call expression, so for tuples it works only is search is started in a tuple declaration.  It leads to incorrect classification of function calls during search phase, but from user perspective it's not visible and works as expected. May be it worth to add a comment or rename it to remove this misleading classification. Issue #2549.

Co-authored-by: Mikhail Modin <mikhailm1@gmail.com>

crates/ra_ide/src/references.rs

@@ -112,25 +112,20 @@ impl IntoIterator for ReferenceSearchResult {
 
 pub(crate) fn find_all_refs(
     db: &RootDatabase,
-    mut position: FilePosition,
+    position: FilePosition,
     search_scope: Option<SearchScope>,
 ) -> Option<RangeInfo<ReferenceSearchResult>> {
     let parse = db.parse(position.file_id);
     let syntax = parse.tree().syntax().clone();
 
-    let token = syntax.token_at_offset(position.offset);
+    let (opt_name, search_kind) =
-    let mut search_kind = ReferenceKind::Other;
+        if let Some(name) = get_struct_def_name_for_struc_litetal_search(&syntax, position) {
+            (Some(name), ReferenceKind::StructLiteral)
+        } else {
+            (find_node_at_offset::<ast::Name>(&syntax, position.offset), ReferenceKind::Other)
+        };
 
-    if let TokenAtOffset::Between(ref left, ref right) = token {
+    let RangeInfo { range, info: (name, def) } = find_name(db, &syntax, position, opt_name)?;
-        if (right.kind() == SyntaxKind::L_CURLY || right.kind() == SyntaxKind::L_PAREN)
-            && left.kind() != SyntaxKind::IDENT
-        {
-            position = FilePosition { offset: left.text_range().start(), ..position };
-            search_kind = ReferenceKind::StructLiteral;
-        }
-    }
-
-    let RangeInfo { range, info: (name, def) } = find_name(db, &syntax, position)?;
 
     let declaration = match def.kind {
         NameKind::Macro(mac) => mac.to_nav(db),
@@ -170,9 +165,10 @@ fn find_name(
     db: &RootDatabase,
     syntax: &SyntaxNode,
     position: FilePosition,
+    opt_name: Option<ast::Name>,
 ) -> Option<RangeInfo<(String, NameDefinition)>> {
     let mut sb = SourceBinder::new(db);
-    if let Some(name) = find_node_at_offset::<ast::Name>(&syntax, position.offset) {
+    if let Some(name) = opt_name {
         let def = classify_name(&mut sb, InFile::new(position.file_id.into(), &name))?;
         let range = name.syntax().text_range();
         return Some(RangeInfo::new(range, (name.text().to_string(), def)));
@@ -218,15 +214,8 @@ fn process_definition(
                 if let Some(d) = classify_name_ref(&mut sb, InFile::new(file_id.into(), &name_ref))
                 {
                     if d == def {
-                        let kind = if name_ref
+                        let kind = if is_record_lit_name_ref(&name_ref)
-                            .syntax()
+                            || is_call_expr_name_ref(&name_ref)
-                            .ancestors()
-                            .find_map(ast::RecordLit::cast)
-                            .and_then(|l| l.path())
-                            .and_then(|p| p.segment())
-                            .and_then(|p| p.name_ref())
-                            .map(|n| n == name_ref)
-                            .unwrap_or(false)
                         {
                             ReferenceKind::StructLiteral
                         } else {
@@ -301,6 +290,49 @@ fn reference_access(kind: &NameKind, name_ref: &ast::NameRef) -> Option<Referenc
     mode.or(Some(ReferenceAccess::Read))
 }
 
+fn is_record_lit_name_ref(name_ref: &ast::NameRef) -> bool {
+    name_ref
+        .syntax()
+        .ancestors()
+        .find_map(ast::RecordLit::cast)
+        .and_then(|l| l.path())
+        .and_then(|p| p.segment())
+        .map(|p| p.name_ref().as_ref() == Some(name_ref))
+        .unwrap_or(false)
+}
+
+fn get_struct_def_name_for_struc_litetal_search(
+    syntax: &SyntaxNode,
+    position: FilePosition,
+) -> Option<ast::Name> {
+    if let TokenAtOffset::Between(ref left, ref right) = syntax.token_at_offset(position.offset) {
+        if right.kind() != SyntaxKind::L_CURLY && right.kind() != SyntaxKind::L_PAREN {
+            return None;
+        }
+        if let Some(name) = find_node_at_offset::<ast::Name>(&syntax, left.text_range().start()) {
+            return name.syntax().ancestors().find_map(ast::StructDef::cast).and_then(|l| l.name());
+        }
+        if find_node_at_offset::<ast::TypeParamList>(&syntax, left.text_range().start()).is_some() {
+            return left.ancestors().find_map(ast::StructDef::cast).and_then(|l| l.name());
+        }
+    }
+    None
+}
+
+fn is_call_expr_name_ref(name_ref: &ast::NameRef) -> bool {
+    name_ref
+        .syntax()
+        .ancestors()
+        .find_map(ast::CallExpr::cast)
+        .and_then(|c| match c.expr()? {
+            ast::Expr::PathExpr(p) => {
+                Some(p.path()?.segment()?.name_ref().as_ref() == Some(name_ref))
+            }
+            _ => None,
+        })
+        .unwrap_or(false)
+}
+
 #[cfg(test)]
 mod tests {
     use crate::{
@@ -309,7 +341,7 @@ mod tests {
     };
 
     #[test]
-    fn test_struct_literal() {
+    fn test_struct_literal_after_space() {
         let code = r#"
     struct Foo <|>{
         a: i32,
@@ -330,6 +362,58 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_struct_literal_befor_space() {
+        let code = r#"
+    struct Foo<|> {}
+        fn main() {
+        let f: Foo;
+        f = Foo {};
+    }"#;
+
+        let refs = get_all_refs(code);
+        check_result(
+            refs,
+            "Foo STRUCT_DEF FileId(1) [5; 18) [12; 15) Other",
+            &["FileId(1) [54; 57) Other", "FileId(1) [71; 74) StructLiteral"],
+        );
+    }
+
+    #[test]
+    fn test_struct_literal_with_generic_type() {
+        let code = r#"
+    struct Foo<T> <|>{}
+        fn main() {
+        let f: Foo::<i32>;
+        f = Foo {};
+    }"#;
+
+        let refs = get_all_refs(code);
+        check_result(
+            refs,
+            "Foo STRUCT_DEF FileId(1) [5; 21) [12; 15) Other",
+            &["FileId(1) [81; 84) StructLiteral"],
+        );
+    }
+
+    #[test]
+    fn test_struct_literal_for_tuple() {
+        let code = r#"
+    struct Foo<|>(i32);
+
+    fn main() {
+        let f: Foo;
+        f = Foo(1);
+    }"#;
+
+        let refs = get_all_refs(code);
+        check_result(
+            refs,
+            "Foo STRUCT_DEF FileId(1) [5; 21) [12; 15) Other",
+            &["FileId(1) [71; 74) StructLiteral"],
+        );
+    }
+
     #[test]
     fn test_find_all_refs_for_local() {
         let code = r#"
@@ -564,7 +648,7 @@ mod tests {
         check_result(
             refs,
             "quux FN_DEF FileId(1) [18; 34) [25; 29) Other",
-            &["FileId(2) [16; 20) Other", "FileId(3) [16; 20) Other"],
+            &["FileId(2) [16; 20) StructLiteral", "FileId(3) [16; 20) StructLiteral"],
         );
 
         let refs =
@@ -572,7 +656,7 @@ mod tests {
         check_result(
             refs,
             "quux FN_DEF FileId(1) [18; 34) [25; 29) Other",
-            &["FileId(3) [16; 20) Other"],
+            &["FileId(3) [16; 20) StructLiteral"],
         );
     }
 
@@ -591,7 +675,7 @@ mod tests {
         check_result(
             refs,
             "m1 MACRO_CALL FileId(1) [9; 63) [46; 48) Other",
-            &["FileId(1) [96; 98) Other", "FileId(1) [114; 116) Other"],
+            &["FileId(1) [96; 98) StructLiteral", "FileId(1) [114; 116) StructLiteral"],
         );
     }