Support goto-def on exported methods too

Author: dwijnand

compiler/src/dotty/tools/dotc/ast/tpd.scala

@@ -1142,6 +1142,11 @@ object tpd extends Trees.Instance[Type] with TypedTreeInfo {
       buf.toList
     }
 
+    def collectSubTrees[A](f: PartialFunction[Tree, A])(using Context): List[A] =
+      val buf = mutable.ListBuffer[A]()
+      foreachSubTree(f.runWith(buf += _)(_))
+      buf.toList
+
     /** Set this tree as the `defTree` of its symbol and return this tree */
     def setDefTree(using Context): ThisTree = {
       val sym = tree.symbol

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -19,9 +19,7 @@ import DenotTransformers.*
 import StdNames.*
 import NameOps.*
 import NameKinds.LazyImplicitName
-import ast.tpd
-import tpd.{Tree, TreeProvider, TreeOps}
-import ast.TreeTypeMap
+import ast.*, tpd.*
 import Constants.Constant
 import Variances.Variance
 import reporting.Message
@@ -336,6 +334,15 @@ object Symbols extends SymUtils {
         denot.info.dropAlias.finalResultType.typeConstructor match
           case tp: NamedType => tp.symbol.sourceSymbol
           case _             => this
+      else if denot.is(ExportedTerm) then
+        val root = denot.maybeOwner match
+          case cls: ClassSymbol => cls.rootTreeContaining(name.toString)
+          case _                => EmptyTree
+        val targets = root.collectSubTrees:
+          case tree: DefDef if tree.name == name => methPart(tree.rhs).tpe
+        targets.match
+          case (tp: NamedType) :: _ => tp.symbol.sourceSymbol
+          case _                    => this
       else if (denot.is(Synthetic)) {
         val linked = denot.linkedClass
         if (linked.exists && !linked.is(Synthetic))

presentation-compiler/src/main/dotty/tools/pc/MetalsInteractive.scala

@@ -1,19 +1,14 @@
-package dotty.tools.pc
+package dotty.tools
+package pc
 
 import scala.annotation.tailrec
 
-import dotty.tools.dotc.ast.tpd
-import dotty.tools.dotc.ast.tpd.*
-import dotty.tools.dotc.ast.untpd
-import dotty.tools.dotc.core.Contexts.*
-import dotty.tools.dotc.core.Flags.*
-import dotty.tools.dotc.core.Names.Name
-import dotty.tools.dotc.core.StdNames
-import dotty.tools.dotc.core.Symbols.*
-import dotty.tools.dotc.core.Types.Type
-import dotty.tools.dotc.interactive.SourceTree
-import dotty.tools.dotc.util.SourceFile
-import dotty.tools.dotc.util.SourcePosition
+import dotc.*
+import ast.*, tpd.*
+import core.*, Contexts.*, Decorators.*, Flags.*, Names.*, Symbols.*, Types.*
+import interactive.*
+import util.*
+import util.SourcePosition
 
 object MetalsInteractive:
 
@@ -205,7 +200,7 @@ object MetalsInteractive:
             Nil
 
       case path @ head :: tail =>
-        if head.symbol.is(ExportedType) then
+        if head.symbol.is(Exported) then
           val sym = head.symbol.sourceSymbol
           List((sym, sym.info))
         else if head.symbol.is(Synthetic) then

presentation-compiler/test/dotty/tools/pc/tests/definition/PcDefinitionSuite.scala

@@ -199,89 +199,67 @@ class PcDefinitionSuite extends BasePcDefinitionSuite:
          |""".stripMargin
     )
 
-  @Test def `exportType1` =
-    check(
-      """object enumerations:
-        |  trait <<SymbolKind>>
-        |  trait CymbalKind
-        |
-        |object all:
-        |  export enumerations.*
-        |
-        |@main def hello =
-        |  import all.SymbolKind
-        |  import enumerations.CymbalKind
-        |
-        |  val x = new Symbo@@lKind {}
-        |  val y = new CymbalKind {}
+  @Test def exportType0 =
+    check(
+      """object Foo:
+        |  trait <<Cat>>
+        |object Bar:
+        |  export Foo.*
+        |class Test:
+        |  import Bar.*
+        |  def test = new Ca@@t {}
         |""".stripMargin
     )
 
-  @Test def `exportType1Wild` =
-    check(
-      """object enumerations:
-        |  trait <<SymbolKind>>
-        |  trait CymbalKind
-        |
-        |object all:
-        |  export enumerations.SymbolKind
-        |
-        |@main def hello =
-        |  import all.SymbolKind
-        |  import enumerations.CymbalKind
-        |
-        |  val x = new Symbo@@lKind {}
-        |  val y = new CymbalKind {}
+  @Test def exportType1 =
+    check(
+      """object Foo:
+        |  trait <<Cat>>[A]
+        |object Bar:
+        |  export Foo.*
+        |class Test:
+        |  import Bar.*
+        |  def test = new Ca@@t[Int] {}
         |""".stripMargin
     )
 
-  @Test def `exportTerm1` =
+  @Test def exportTerm0Nullary =
     check(
-      """class BitMap
-        |class Scanner:
-        |  def scan(): BitMap = ???
-        |class Copier:
-        |  private val scanUnit = new Scanner
-        |  export scanUnit.<<scan>>
-        |  def t1 = sc@@an()
+      """trait Foo:
+        |  def <<meth>>: Int
+        |class Bar(val foo: Foo):
+        |  export foo.*
+        |  def test(bar: Bar) = bar.me@@th
         |""".stripMargin
     )
 
-  @Test def `exportTerm2` =
+  @Test def exportTerm0 =
     check(
-      """class BitMap
-        |class Scanner:
-        |  def scan(): BitMap = ???
-        |class Copier:
-        |  private val scanUnit = new Scanner
-        |  export scanUnit.<<scan>>
-        |class Test:
-        |  def t2(cpy: Copier) = cpy.sc@@an()
+      """trait Foo:
+        |  def <<meth>>(): Int
+        |class Bar(val foo: Foo):
+        |  export foo.*
+        |  def test(bar: Bar) = bar.me@@th()
         |""".stripMargin
     )
 
-  @Test def `exportTerm1Wild` =
+  @Test def exportTerm1 =
     check(
-      """class BitMap
-        |class Scanner:
-        |  def scan(): BitMap = ???
-        |class Copier:
-        |  private val scanUnit = new Scanner
-        |  export scanUnit.<<*>>
-        |  def t1 = sc@@an()
+      """trait Foo:
+        |  def <<meth>>(x: Int): Int
+        |class Bar(val foo: Foo):
+        |  export foo.*
+        |  def test(bar: Bar) = bar.me@@th(0)
         |""".stripMargin
     )
 
-  @Test def `exportTerm2Wild` =
+  @Test def exportTerm1Poly =
     check(
-      """class BitMap
-        |class Scanner:
-        |  def scan(): BitMap = ???
-        |class Copier:
-        |  private val scanUnit = new Scanner
-        |  export scanUnit.<<*>>
-        |class Test:
-        |  def t2(cpy: Copier) = cpy.sc@@an()
+      """trait Foo:
+        |  def <<meth>>[A](x: A): A
+        |class Bar(val foo: Foo):
+        |  export foo.*
+        |  def test(bar: Bar) = bar.me@@th(0)
         |""".stripMargin
     )