Merge #4775

4775: Add goto def for enum variant field r=matklad a=unexge

Closes #4764. I'm not familiar with ra codebase, there might be better ways to do that 😄 

Co-authored-by: unexge <unexge@gmail.com>

Author: bors[bot]

crates/ra_ide/src/goto_definition.rs

@@ -1,6 +1,6 @@
 use hir::Semantics;
 use ra_ide_db::{
-    defs::{classify_name, classify_name_ref},
+    defs::{classify_name, classify_name_ref, NameClass},
     symbol_index, RootDatabase,
 };
 use ra_syntax::{
@@ -39,7 +39,10 @@ pub(crate) fn goto_definition(
                 reference_definition(&sema, &name_ref).to_vec()
             },
             ast::Name(name) => {
-                let def = classify_name(&sema, &name)?.definition();
+                let def = match classify_name(&sema, &name)? {
+                    NameClass::Definition(def) | NameClass::ConstReference(def) => def,
+                    NameClass::FieldShorthand { local: _, field } => field,
+                };
                 let nav = def.try_to_nav(sema.db)?;
                 vec![nav]
             },
@@ -886,4 +889,23 @@ mod tests {
             "x",
         )
     }
+
+    #[test]
+    fn goto_def_for_enum_variant_field() {
+        check_goto(
+            "
+            //- /lib.rs
+            enum Foo {
+                Bar { x: i32 }
+            }
+            fn baz(foo: Foo) {
+                match foo {
+                    Foo::Bar { x<|> } => x
+                };
+            }
+            ",
+            "x RECORD_FIELD_DEF FileId(1) 21..27 21..22",
+            "x: i32|x",
+        );
+    }
 }

crates/ra_ide/src/syntax_highlighting.rs

@@ -436,6 +436,7 @@ fn highlight_element(
                     highlight_name(db, def) | HighlightModifier::Definition
                 }
                 Some(NameClass::ConstReference(def)) => highlight_name(db, def),
+                Some(NameClass::FieldShorthand { .. }) => HighlightTag::Field.into(),
                 None => highlight_name_by_syntax(name) | HighlightModifier::Definition,
             }
         }

crates/ra_ide_db/src/defs.rs

@@ -82,38 +82,40 @@ pub enum NameClass {
     Definition(Definition),
     /// `None` in `if let None = Some(82) {}`
     ConstReference(Definition),
+    FieldShorthand {
+        local: Local,
+        field: Definition,
+    },
 }
 
 impl NameClass {
     pub fn into_definition(self) -> Option<Definition> {
         match self {
             NameClass::Definition(it) => Some(it),
             NameClass::ConstReference(_) => None,
+            NameClass::FieldShorthand { local, field: _ } => Some(Definition::Local(local)),
         }
     }
 
     pub fn definition(self) -> Definition {
         match self {
             NameClass::Definition(it) | NameClass::ConstReference(it) => it,
+            NameClass::FieldShorthand { local: _, field } => field,
         }
     }
 }
 
 pub fn classify_name(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameClass> {
     let _p = profile("classify_name");
 
-    if let Some(bind_pat) = name.syntax().parent().and_then(ast::BindPat::cast) {
+    let parent = name.syntax().parent()?;
+
+    if let Some(bind_pat) = ast::BindPat::cast(parent.clone()) {
         if let Some(def) = sema.resolve_bind_pat_to_const(&bind_pat) {
             return Some(NameClass::ConstReference(Definition::ModuleDef(def)));
         }
     }
 
-    classify_name_inner(sema, name).map(NameClass::Definition)
-}
-
-fn classify_name_inner(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<Definition> {
-    let parent = name.syntax().parent()?;
-
     match_ast! {
         match parent {
             ast::Alias(it) => {
@@ -123,63 +125,71 @@ fn classify_name_inner(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Opti
                 let name_ref = path_segment.name_ref()?;
                 let name_ref_class = classify_name_ref(sema, &name_ref)?;
 
-                Some(name_ref_class.definition())
+                Some(NameClass::Definition(name_ref_class.definition()))
             },
             ast::BindPat(it) => {
                 let local = sema.to_def(&it)?;
-                Some(Definition::Local(local))
+
+                if let Some(record_field_pat) = it.syntax().parent().and_then(ast::RecordFieldPat::cast) {
+                    if let Some(field) = sema.resolve_record_field_pat(&record_field_pat) {
+                        let field = Definition::Field(field);
+                        return Some(NameClass::FieldShorthand { local, field });
+                    }
+                }
+
+                Some(NameClass::Definition(Definition::Local(local)))
             },
             ast::RecordFieldDef(it) => {
                 let field: hir::Field = sema.to_def(&it)?;
-                Some(Definition::Field(field))
+                Some(NameClass::Definition(Definition::Field(field)))
             },
             ast::Module(it) => {
                 let def = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::StructDef(it) => {
                 let def: hir::Struct = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::UnionDef(it) => {
                 let def: hir::Union = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::EnumDef(it) => {
                 let def: hir::Enum = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::TraitDef(it) => {
                 let def: hir::Trait = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::StaticDef(it) => {
                 let def: hir::Static = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::EnumVariant(it) => {
                 let def: hir::EnumVariant = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::FnDef(it) => {
                 let def: hir::Function = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::ConstDef(it) => {
                 let def: hir::Const = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::TypeAliasDef(it) => {
                 let def: hir::TypeAlias = sema.to_def(&it)?;
-                Some(Definition::ModuleDef(def.into()))
+                Some(NameClass::Definition(Definition::ModuleDef(def.into())))
             },
             ast::MacroCall(it) => {
                 let def = sema.to_def(&it)?;
-                Some(Definition::Macro(def))
+                Some(NameClass::Definition(Definition::Macro(def)))
             },
             ast::TypeParam(it) => {
                 let def = sema.to_def(&it)?;
-                Some(Definition::TypeParam(def))
+                Some(NameClass::Definition(Definition::TypeParam(def)))
             },
             _ => None,
         }