Hide unused generic type variables in constructor

6 files changed, 29 insertions, 9 deletions

diff --git a/plugins/base/src/main/kotlin/signatures/JvmSignatureUtils.kt b/plugins/base/src/main/kotlin/signatures/JvmSignatureUtils.kt
index 689f6db5..0defc69e 100644
--- a/plugins/base/src/main/kotlin/signatures/JvmSignatureUtils.kt
+++ b/plugins/base/src/main/kotlin/signatures/JvmSignatureUtils.kt
@@ -6,6 +6,8 @@ import org.jetbrains.dokka.model.*
 import org.jetbrains.dokka.model.properties.WithExtraProperties
 import org.jetbrains.dokka.pages.*
 import org.jetbrains.dokka.DokkaConfiguration.DokkaSourceSet
+import org.jetbrains.dokka.base.signatures.KotlinSignatureUtils.driOrNull
+import org.jetbrains.dokka.base.signatures.KotlinSignatureUtils.drisOfAllNestedBounds
 
 interface JvmSignatureUtils {
 
@@ -133,6 +135,10 @@ interface JvmSignatureUtils {
                 it.dri == DRI("kotlin", "Deprecated")
                         || it.dri == DRI("java.lang", "Deprecated")
             } == true) setOf(TextStyle.Strikethrough) else emptySet()
+
+    infix fun DFunction.uses(t: DTypeParameter): Boolean =
+        t.dri in (listOfNotNull(receiver?.type?.drisOfAllNestedBounds, receiver?.dri) +
+                parameters.flatMap { listOf(it.dri) + it.type.drisOfAllNestedBounds })
 }
 
 sealed class AtStrategy
diff --git a/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt b/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
index 16598acd..823e1e8f 100644
--- a/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
+++ b/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
@@ -15,7 +15,6 @@ import org.jetbrains.dokka.pages.ContentKind
 import org.jetbrains.dokka.pages.ContentNode
 import org.jetbrains.dokka.pages.TextStyle
 import org.jetbrains.dokka.utilities.DokkaLogger
-import java.lang.IllegalStateException
 import kotlin.text.Typography.nbsp
 
 class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLogger) : SignatureProvider,
@@ -240,7 +239,8 @@ class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLog
                 )
                 text(f.modifiers()[it]?.toSignatureString() ?: "")
                 text("fun ")
-                list(f.generics, prefix = "<", suffix = "> ") {
+                val usedGenerics = f.generics.filter { f uses it }
+                list(usedGenerics, prefix = "<", suffix = "> ") {
                     +buildSignature(it)
                 }
                 f.receiver?.also {
@@ -317,7 +317,7 @@ class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLog
         p: Projection, showFullyQualifiedName: Boolean = false
     ): Unit =
         when (p) {
-            is TypeParameter -> link(p.name, p.declarationDRI)
+            is TypeParameter -> link(p.name, p.dri)
 
             is TypeConstructor -> if (p.function)
                 +funType(mainDRI.single(), mainSourcesetData, p)
diff --git a/plugins/base/src/main/kotlin/signatures/KotlinSignatureUtils.kt b/plugins/base/src/main/kotlin/signatures/KotlinSignatureUtils.kt
index 193b41e1..e8107177 100644
--- a/plugins/base/src/main/kotlin/signatures/KotlinSignatureUtils.kt
+++ b/plugins/base/src/main/kotlin/signatures/KotlinSignatureUtils.kt
@@ -35,7 +35,7 @@ object KotlinSignatureUtils : JvmSignatureUtils {
     val Bound.driOrNull: DRI?
         get() {
             return when (this) {
-                is TypeParameter -> this.declarationDRI
+                is TypeParameter -> this.dri
                 is TypeConstructor -> this.dri
                 is Nullable -> this.inner.driOrNull
                 is PrimitiveJavaType -> this.dri
@@ -45,4 +45,18 @@ object KotlinSignatureUtils : JvmSignatureUtils {
                 is UnresolvedBound -> null
             }
         }
+
+    val Projection.drisOfAllNestedBounds: List<DRI> get() = when (this) {
+        is TypeParameter -> listOf(dri)
+        is TypeConstructor -> listOf(dri) + projections.flatMap { it.drisOfAllNestedBounds }
+        is Nullable -> inner.drisOfAllNestedBounds
+        is PrimitiveJavaType -> listOf(dri)
+        is Void -> listOf(DriOfUnit)
+        is JavaObject -> listOf(DriOfAny)
+        is Dynamic -> emptyList()
+        is UnresolvedBound -> emptyList()
+        is Variance -> inner.drisOfAllNestedBounds
+        is Star -> emptyList()
+    }
+
 }
diff --git a/plugins/base/src/main/kotlin/transformers/documentables/ExtensionExtractorTransformer.kt b/plugins/base/src/main/kotlin/transformers/documentables/ExtensionExtractorTransformer.kt
index 6ce6e396..af65c205 100644
--- a/plugins/base/src/main/kotlin/transformers/documentables/ExtensionExtractorTransformer.kt
+++ b/plugins/base/src/main/kotlin/transformers/documentables/ExtensionExtractorTransformer.kt
@@ -91,7 +91,7 @@ private fun Callable.asPairsWithReceiverDRIs(): Sequence<Pair<DRI, Callable>> =
 private fun Callable.findReceiverDRIs(bound: Bound): Sequence<DRI> = when (bound) {
     is Nullable -> findReceiverDRIs(bound.inner)
     is TypeParameter ->
-        if (this is DFunction && bound.declarationDRI == this.dri)
+        if (this is DFunction && bound.dri == this.dri)
             generics.find { it.name == bound.name }?.bounds?.asSequence()?.flatMap(::findReceiverDRIs).orEmpty()
         else
             emptySequence()
diff --git a/plugins/base/src/main/kotlin/translators/descriptors/DefaultDescriptorToDocumentableTranslator.kt b/plugins/base/src/main/kotlin/translators/descriptors/DefaultDescriptorToDocumentableTranslator.kt
index 9584d35a..b172cebc 100644
--- a/plugins/base/src/main/kotlin/translators/descriptors/DefaultDescriptorToDocumentableTranslator.kt
+++ b/plugins/base/src/main/kotlin/translators/descriptors/DefaultDescriptorToDocumentableTranslator.kt
@@ -603,11 +603,11 @@ private class DokkaDescriptorVisitor(
         is DynamicType -> Dynamic
         else -> when (val ctor = constructor.declarationDescriptor) {
             is TypeParameterDescriptor -> TypeParameter(
-                declarationDRI = DRI.from(ctor.containingDeclaration).withPackageFallbackTo(fallbackPackageName()),
+                dri = DRI.from(ctor).withPackageFallbackTo(fallbackPackageName()),
                 name = ctor.name.asString()
             )
             else -> TypeConstructor(
-                DRI.from(constructor.declarationDescriptor!!), // TODO: remove '!!'
+                DRI.from(ctor!!), // TODO: remove '!!'
                 arguments.map { it.toProjection() },
                 if (isExtensionFunctionType) FunctionModifiers.EXTENSION
                 else if (isFunctionType) FunctionModifiers.FUNCTION
diff --git a/plugins/base/src/main/kotlin/translators/psi/DefaultPsiToDocumentableTranslator.kt b/plugins/base/src/main/kotlin/translators/psi/DefaultPsiToDocumentableTranslator.kt
index 8dee2478..c9118920 100644
--- a/plugins/base/src/main/kotlin/translators/psi/DefaultPsiToDocumentableTranslator.kt
+++ b/plugins/base/src/main/kotlin/translators/psi/DefaultPsiToDocumentableTranslator.kt
@@ -360,9 +360,9 @@ class DefaultPsiToDocumentableTranslator(
                             ?: return UnresolvedBound(type.presentableText)
                         when {
                             resolved.qualifiedName == "java.lang.Object" -> JavaObject
-                            resolved is PsiTypeParameter && resolved.owner != null ->
+                            resolved is PsiTypeParameter ->
                                 TypeParameter(
-                                    declarationDRI = DRI.from(resolved.owner!!),
+                                    dri = DRI.from(resolved),
                                     name = resolved.name.orEmpty()
                                 )
                             else ->