Add using keyword to scala3doc and hide synthetic names

Author: BarkingBad

scala3doc-testcases/src/tests/using.scala

@@ -0,0 +1,16 @@
+package tests
+package usings
+
+class Named
+class ClassTag[T]
+given ClassTag[Int] = ClassTag[Int]
+given ClassTag[String] = ClassTag[String]
+
+/** ...
+ *
+ *  @param t: this is an explicit parameter
+ *  @param named: this is an implicit paramter
+ *  @param ClassTag[String]: this is next implicit parameter
+ */
+def f[T](t: T)(using ClassTag[Int])(using ClassTag[String])(using named: Named)(using ClassTag[T]): Unit = ???
+def f2[T](t: T)(using ClassTag[Int])(using ClassTag[Int], ClassTag[String]): Unit = ???

scala3doc/src/dotty/dokka/model/api/api.scala

@@ -56,14 +56,14 @@ trait Classlike
 enum Kind(val name: String){
   case RootPackage extends Kind("")
   case Package extends Kind("package")
-  case Class(typeParams: Seq[TypeParameter], argsLists: Seq[Seq[Parameter]])
+  case Class(typeParams: Seq[TypeParameter], argsLists: Seq[ParametersList])
     extends Kind("class") with Classlike
   case Object extends Kind("object") with Classlike
-  case Trait(typeParams: Seq[TypeParameter], argsLists: Seq[Seq[Parameter]])
+  case Trait(typeParams: Seq[TypeParameter], argsLists: Seq[ParametersList])
     extends Kind("trait") with Classlike
   case Enum extends Kind("enum") with Classlike
   case EnumCase(kind: Object.type | Type | Val.type) extends Kind("case")
-  case Def(typeParams: Seq[TypeParameter], argsLists: Seq[Seq[Parameter]])
+  case Def(typeParams: Seq[TypeParameter], argsLists: Seq[ParametersList])
     extends Kind("def")
   case Extension(on: ExtensionTarget, m: Kind.Def) extends Kind("def")
   case Constructor(base: Kind.Def) extends Kind("def")
@@ -100,10 +100,15 @@ object Annotation:
   case class LinkParameter(name: Option[String] = None, dri: DRI, value: String) extends AnnotationParameter
   case class UnresolvedParameter(name: Option[String] = None, unresolvedText: String) extends AnnotationParameter
 
+case class ParametersList(
+  parameters: Seq[Parameter],
+  modifiers: String
+)
+
 case class Parameter(
   annotations: Seq[Annotation],
   modifiers: String,
-  name: String,
+  name: Option[String],
   dri: DRI,
   signature: Signature,
   isExtendedSymbol: Boolean = false,

scala3doc/src/dotty/dokka/tasty/ClassLikeSupport.scala

@@ -45,7 +45,7 @@ trait ClassLikeSupport:
           .filter(s => s.exists && !s.isHiddenByVisibility)
           .map( _.tree.asInstanceOf[DefDef])
       constr.fold(Nil)(
-        _.paramss.map(_.map(mkParameter(_, parameterModifier)))
+        _.paramss.map(pList => ParametersList(pList.map(mkParameter(_, parameterModifier)), if isUsingModifier(pList) then "using " else ""))
         )
 
     if classDef.symbol.flags.is(Flags.Module) then Kind.Object
@@ -335,7 +335,7 @@ trait ClassLikeSupport:
 
     val basicKind: Kind.Def = Kind.Def(
       genericTypes.map(mkTypeArgument),
-      paramLists.map(_.map(mkParameter(_, paramPrefix)))
+      paramLists.map(pList => ParametersList(pList.map(mkParameter(_, paramPrefix)), if isUsingModifier(pList) then "using " else ""))
     )
 
     val methodKind =
@@ -376,12 +376,12 @@ trait ClassLikeSupport:
     isExtendedSymbol: Boolean = false,
     isGrouped: Boolean = false) =
       val inlinePrefix = if argument.symbol.flags.is(Flags.Inline) then "inline " else ""
-      // TODO (https://github.com/lampepfl/dotty/issues/10525): Add using flag
+      val name = Option.when(!argument.symbol.flags.is(Flags.Synthetic))(argument.symbol.normalizedName)
 
       Parameter(
         argument.symbol.getAnnotations(),
         inlinePrefix + prefix(argument.symbol),
-        argument.symbol.normalizedName,
+        name,
         argument.symbol.dri,
         argument.tpt.dokkaType.asSignature,
         isExtendedSymbol,
@@ -467,3 +467,6 @@ trait ClassLikeSupport:
         /*isExpectActual =*/ false,
         PropertyContainer.Companion.empty().plus(member.copy(rawDoc = symbol.documentation2)).plus(compositeExt)
     )
+
+  private def isUsingModifier(parameters: Seq[ValDef]): Boolean =
+    parameters.size > 0 && parameters(0).symbol.flags.is(Flags.Given)

scala3doc/src/dotty/dokka/translators/ScalaSignatureUtils.scala

@@ -80,16 +80,15 @@ trait SignatureBuilder extends ScalaSignatureUtils {
       bdr.text(e.variance).memberName(e.name, e.dri).signature(e.signature)
     }
 
-    def functionParameters(params: Seq[Seq[Parameter]]) =
+    def functionParameters(params: Seq[ParametersList]) =
       if params.isEmpty then this.text("")
-      else if params == List(Nil) then this.text("()")
+      else if params.size == 1 && params(0).parameters == Nil then this.text("()")
       else this.list(params, separator = ""){ (bld, pList) =>
-        bld.list(pList, "(", ")"){ (bld, p) =>
-            bld.annotationsInline(p)
+        bld.list(pList.parameters, s"(${pList.modifiers}", ")"){ (bld, p) =>
+            val annotationsAndModifiers = bld.annotationsInline(p)
               .text(p.modifiers)
-              .memberName(p.name, p.dri)
-              .text(": ")
-              .signature(p.signature)
+            val name = p.name.fold(annotationsAndModifiers)(annotationsAndModifiers.memberName(_, p.dri).text(": "))
+            name.signature(p.signature)
         }
       }
 }