surface (fix): Fixes #3418 Handle surface of List of generic tuples (#…

…3427)

Again starting with the test, passing in Scala 2

Let us see if I will be able to fix it, this time I am not yet sure
where to start.

airframe-surface/src/main/scala-3/wvlet/airframe/surface/CompileTimeSurfaceFactory.scala

@@ -522,21 +522,29 @@ private[surface] class CompileTimeSurfaceFactory[Q <: Quotes](using quotes: Q):
         .collect { case (s: Symbol, i: Int, v: ValDef) =>
           // E.g. case class Foo(a: String)(implicit b: Int)
           // println(s"=== ${v.show} ${s.flags.show} ${s.flags.is(Flags.Implicit)}")
-          // Substitue type param to actual types
-          val resolved: TypeRepr = v.tpt.tpe match
-            case a: AppliedType =>
-              val resolvedTypeArgs = a.args.map {
-                case p if p.typeSymbol.isTypeParam && typeArgTable.contains(p.typeSymbol.name) =>
-                  typeArgTable(p.typeSymbol.name)
-                case other =>
-                  other
-              }
-              // Need to use the base type of the applied type to replace the type parameters
-              a.tycon.appliedTo(resolvedTypeArgs)
-            case TypeRef(_, name) if typeArgTable.contains(name) =>
-              typeArgTable(name)
-            case other =>
-              other
+          // Substitute type param to actual types
+
+          def resolveType(t: TypeRepr): TypeRepr =
+            t match
+              case a: AppliedType =>
+                // println(s"===  a.args ${a.args}")
+                // println(s"===  typeArgTable ${typeArgTable}")
+                val resolvedTypeArgs = a.args.map {
+                  case p if p.typeSymbol.isTypeParam && typeArgTable.contains(p.typeSymbol.name) =>
+                    typeArgTable(p.typeSymbol.name)
+                  case other =>
+                    resolveType(other)
+                }
+                // println(s"===  resolvedTypeArgs ${resolvedTypeArgs}")
+                // Need to use the base type of the applied type to replace the type parameters
+                a.tycon.appliedTo(resolvedTypeArgs)
+              case TypeRef(_, name) if typeArgTable.contains(name) =>
+                typeArgTable(name)
+              case other =>
+                other
+
+          val resolved: TypeRepr = resolveType(v.tpt.tpe)
+
           val isSecret           = hasSecretAnnotation(s)
           val isRequired         = hasRequiredAnnotation(s)
           val isImplicit         = s.flags.is(Flags.Implicit)

airframe-surface/src/test/scala/wvlet/airframe/surface/i3418.scala

@@ -0,0 +1,47 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package wvlet.airframe.surface
+
+import wvlet.airspec.AirSpec
+
+object i3418 extends AirSpec {
+
+  case class A[P](data: List[(String, P)])
+  case class AA[T, P](data: List[(T, P)])
+
+  case class S(a: A[Int])
+  case class SS(a: AA[String, Long])
+
+  test("Support generic List of tuples") {
+    val s = Surface.of[S]
+    debug(s.params)
+    s.params.size shouldBe 1
+    val p1 = s.params(0)
+    p1.name shouldBe "a"
+    val a1 = p1.surface.params(0)
+    a1.name shouldBe "data"
+    a1.surface.name shouldBe "List[Tuple2[String,Int]]"
+  }
+
+  test("Support generic List of tuples with two type parameters") {
+    val s = Surface.of[SS]
+    debug(s.params)
+    s.params.size shouldBe 1
+    val p1 = s.params(0)
+    p1.name shouldBe "a"
+    val a1 = p1.surface.params(0)
+    a1.name shouldBe "data"
+    a1.surface.name shouldBe "List[Tuple2[String,Long]]"
+  }
+}