Generate dedicated pages for typealiases (#3051)

12 files changed, 212 insertions, 23 deletions

diff --git a/plugins/base/api/base.api b/plugins/base/api/base.api
index 7875800e..0af1b46a 100644
--- a/plugins/base/api/base.api
+++ b/plugins/base/api/base.api
@@ -432,6 +432,7 @@ public final class org/jetbrains/dokka/base/renderers/html/NavigationNodeIcon :
 	public static final field INTERFACE Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
 	public static final field INTERFACE_KT Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
 	public static final field OBJECT Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
+	public static final field TYPEALIAS_KT Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
 	public static final field VAL Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
 	public static final field VAR Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
 	public static fun valueOf (Ljava/lang/String;)Lorg/jetbrains/dokka/base/renderers/html/NavigationNodeIcon;
@@ -1464,7 +1465,7 @@ public class org/jetbrains/dokka/base/translators/documentables/DefaultPageCreat
 	public final fun getLogger ()Lorg/jetbrains/dokka/utilities/DokkaLogger;
 	protected final fun getMergeImplicitExpectActualDeclarations ()Z
 	protected final fun getSeparateInheritedMembers ()Z
-	public fun pageForClasslike (Lorg/jetbrains/dokka/model/DClasslike;)Lorg/jetbrains/dokka/pages/ClasslikePageNode;
+	public fun pageForClasslike (Lorg/jetbrains/dokka/model/Documentable;)Lorg/jetbrains/dokka/pages/ClasslikePageNode;
 	public fun pageForClasslikes (Ljava/util/List;)Lorg/jetbrains/dokka/pages/ClasslikePageNode;
 	public fun pageForEnumEntries (Ljava/util/List;)Lorg/jetbrains/dokka/pages/ClasslikePageNode;
 	public fun pageForEnumEntry (Lorg/jetbrains/dokka/model/DEnumEntry;)Lorg/jetbrains/dokka/pages/ClasslikePageNode;
diff --git a/plugins/base/src/main/kotlin/renderers/html/NavigationDataProvider.kt b/plugins/base/src/main/kotlin/renderers/html/NavigationDataProvider.kt
index 4dae21c8..be1b0fcf 100644
--- a/plugins/base/src/main/kotlin/renderers/html/NavigationDataProvider.kt
+++ b/plugins/base/src/main/kotlin/renderers/html/NavigationDataProvider.kt
@@ -41,6 +41,7 @@ abstract class NavigationDataProvider {
             val isJava = documentable?.hasAnyJavaSources() ?: false
 
             when (documentable) {
+                is DTypeAlias -> NavigationNodeIcon.TYPEALIAS_KT
                 is DClass -> when {
                     documentable.isException -> NavigationNodeIcon.EXCEPTION
                     documentable.isAbstract() -> {
diff --git a/plugins/base/src/main/kotlin/renderers/html/NavigationPage.kt b/plugins/base/src/main/kotlin/renderers/html/NavigationPage.kt
index fc17983d..9543c388 100644
--- a/plugins/base/src/main/kotlin/renderers/html/NavigationPage.kt
+++ b/plugins/base/src/main/kotlin/renderers/html/NavigationPage.kt
@@ -109,6 +109,7 @@ enum class NavigationNodeIcon(
     FUNCTION("function"),
     EXCEPTION("exception-class"),
     OBJECT("object"),
+    TYPEALIAS_KT("typealias-kt"),
     VAL("val"),
     VAR("var");
 
diff --git a/plugins/base/src/main/kotlin/renderers/html/htmlPreprocessors.kt b/plugins/base/src/main/kotlin/renderers/html/htmlPreprocessors.kt
index 7ffcd9e3..a213bce9 100644
--- a/plugins/base/src/main/kotlin/renderers/html/htmlPreprocessors.kt
+++ b/plugins/base/src/main/kotlin/renderers/html/htmlPreprocessors.kt
@@ -120,6 +120,7 @@ object AssetsInstaller : PageTransformer {
         "images/nav-icons/interface.svg",
         "images/nav-icons/interface-kotlin.svg",
         "images/nav-icons/object.svg",
+        "images/nav-icons/typealias-kotlin.svg",
     )
 
     override fun invoke(input: RootPageNode) = input.modified(
diff --git a/plugins/base/src/main/kotlin/translators/documentables/DefaultPageCreator.kt b/plugins/base/src/main/kotlin/translators/documentables/DefaultPageCreator.kt
index 1abd3441..ffc7fd85 100644
--- a/plugins/base/src/main/kotlin/translators/documentables/DefaultPageCreator.kt
+++ b/plugins/base/src/main/kotlin/translators/documentables/DefaultPageCreator.kt
@@ -42,21 +42,34 @@ open class DefaultPageCreator(
     open fun pageForModule(m: DModule): ModulePageNode =
         ModulePageNode(m.name.ifEmpty { "<root>" }, contentForModule(m), listOf(m), m.packages.map(::pageForPackage))
 
+    /**
+     * We want to generate separated pages for no-actual typealias.
+     * Actual typealias are displayed on pages for their expect class (trough [ActualTypealias] extra).
+     *
+     * @see ActualTypealias
+     */
+    private fun List<Documentable>.filterOutActualTypeAlias(): List<Documentable> {
+        fun List<Documentable>.hasExpectClass(dri: DRI) = find { it is DClasslike && it.dri == dri && it.expectPresentInSet != null } != null
+        return this.filterNot { it is DTypeAlias && this.hasExpectClass(it.dri) }
+    }
+
     open fun pageForPackage(p: DPackage): PackagePageNode = PackagePageNode(
         p.name, contentForPackage(p), setOf(p.dri), listOf(p),
         if (mergeImplicitExpectActualDeclarations)
-            p.classlikes.mergeClashingDocumentable().map(::pageForClasslikes) +
+            (p.classlikes + p.typealiases).filterOutActualTypeAlias()
+                .mergeClashingDocumentable().map(::pageForClasslikes) +
                     p.functions.mergeClashingDocumentable().map(::pageForFunctions) +
                     p.properties.mergeClashingDocumentable().map(::pageForProperties)
         else
-            p.classlikes.renameClashingDocumentable().map(::pageForClasslike) +
+            (p.classlikes + p.typealiases).filterOutActualTypeAlias()
+                .renameClashingDocumentable().map(::pageForClasslike) +
                     p.functions.renameClashingDocumentable().map(::pageForFunction) +
                     p.properties.mapNotNull(::pageForProperty)
     )
 
     open fun pageForEnumEntry(e: DEnumEntry): ClasslikePageNode = pageForEnumEntries(listOf(e))
 
-    open fun pageForClasslike(c: DClasslike): ClasslikePageNode = pageForClasslikes(listOf(c))
+    open fun pageForClasslike(c: Documentable): ClasslikePageNode = pageForClasslikes(listOf(c))
 
     open fun pageForEnumEntries(documentables: List<DEnumEntry>): ClasslikePageNode {
         val dri = documentables.dri.also {
@@ -83,33 +96,38 @@ open class DefaultPageCreator(
         )
     }
 
-    open fun pageForClasslikes(documentables: List<DClasslike>): ClasslikePageNode {
+    /**
+     * @param documentables a list of [DClasslike] and [DTypeAlias] with the same dri in different sourceSets
+     */
+    open fun pageForClasslikes(documentables: List<Documentable>): ClasslikePageNode {
         val dri = documentables.dri.also {
             if (it.size != 1) {
                 logger.error("Documentable dri should have the same one ${it.first()} inside the one page!")
             }
         }
 
+        val classlikes = documentables.filterIsInstance<DClasslike>()
+
         val constructors =
-            if (documentables.shouldDocumentConstructors()) {
-                documentables.flatMap { (it as? WithConstructors)?.constructors ?: emptyList() }
+            if (classlikes.shouldDocumentConstructors()) {
+                classlikes.flatMap { (it as? WithConstructors)?.constructors ?: emptyList() }
             } else {
                 emptyList()
             }
 
-        val classlikes = documentables.flatMap { it.classlikes }
-        val functions = documentables.flatMap { it.filteredFunctions }
-        val props = documentables.flatMap { it.filteredProperties }
-        val entries = documentables.flatMap { if (it is DEnum) it.entries else emptyList() }
+        val nestedClasslikes = classlikes.flatMap { it.classlikes }
+        val functions = classlikes.flatMap { it.filteredFunctions }
+        val props = classlikes.flatMap { it.filteredProperties }
+        val entries = classlikes.flatMap { if (it is DEnum) it.entries else emptyList() }
 
         val childrenPages = constructors.map(::pageForFunction) +
                 if (mergeImplicitExpectActualDeclarations)
-                    classlikes.mergeClashingDocumentable().map(::pageForClasslikes) +
+                    nestedClasslikes.mergeClashingDocumentable().map(::pageForClasslikes) +
                             functions.mergeClashingDocumentable().map(::pageForFunctions) +
                             props.mergeClashingDocumentable().map(::pageForProperties) +
                             entries.mergeClashingDocumentable().map(::pageForEnumEntries)
                 else
-                    classlikes.renameClashingDocumentable().map(::pageForClasslike) +
+                    nestedClasslikes.renameClashingDocumentable().map(::pageForClasslike) +
                             functions.renameClashingDocumentable().map(::pageForFunction) +
                             props.renameClashingDocumentable().mapNotNull(::pageForProperty) +
                             entries.renameClashingDocumentable().map(::pageForEnumEntry)
@@ -329,7 +347,7 @@ open class DefaultPageCreator(
         sortedWith(compareBy({ it.name }, { it.parameters.size }, { it.dri.toString() }))
 
     /**
-     * @param documentables a list of [DClasslike] and [DEnumEntry] with the same dri in different sourceSets
+     * @param documentables a list of [DClasslike] and [DEnumEntry] and [DTypeAlias] with the same dri in different sourceSets
      */
     protected open fun contentForClasslikesAndEntries(documentables: List<Documentable>): ContentGroup =
         contentBuilder.contentFor(documentables.dri, documentables.sourceSets) {
@@ -477,8 +495,7 @@ open class DefaultPageCreator(
                     .takeIf { documentable is DProperty }
             }?.let {
                 group(sourceSets = setOf(sourceSet), kind = ContentKind.BriefComment) {
-                    if (documentable.hasSeparatePage) createBriefComment(documentable, sourceSet, it)
-                    else comment(it.root)
+                    createBriefComment(documentable, sourceSet, it)
                 }
             }
         }
@@ -689,6 +706,7 @@ open class DefaultPageCreator(
     protected open fun TagWrapper.toHeaderString() = this.javaClass.toGenericString().split('.').last()
 }
 
+
 internal val List<Documentable>.sourceSets: Set<DokkaSourceSet>
     get() = flatMap { it.sourceSets }.toSet()
 
@@ -706,9 +724,6 @@ internal val Documentable.descriptions: SourceSetDependent<Description>
 internal val Documentable.customTags: Map<String, SourceSetDependent<CustomTagWrapper>>
     get() = groupedTags.withTypeNamed()
 
-private val Documentable.hasSeparatePage: Boolean
-    get() = this !is DTypeAlias
-
 /**
  * @see DefaultPageCreator.sortDivergentElementsDeterministically for usage
  */
diff --git a/plugins/base/src/main/resources/dokka/images/nav-icons/typealias-kotlin.svg b/plugins/base/src/main/resources/dokka/images/nav-icons/typealias-kotlin.svg
new file mode 100644
index 00000000..4795069b
--- /dev/null
+++ b/plugins/base/src/main/resources/dokka/images/nav-icons/typealias-kotlin.svg
@@ -0,0 +1,9 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="typeAlias">
+<path id="Vector" fill-rule="evenodd" clip-rule="evenodd" d="M8 15C4.134 15 1 11.866 1 8C1 4.134 4.134 1 8 1C11.866 1 15 4.134 15 8H8V15Z" fill="#B99BF8" fill-opacity="0.6"/>
+<path id="Vector_2" fill-rule="evenodd" clip-rule="evenodd" d="M8.5 8H8V11H7.5V6H5.5V5H10.5V6H8.5V8Z" fill="#231F20" fill-opacity="0.7"/>
+<g id="&#226;&#140;&#152;/modifier/kotlin">
+<path id="&#226;&#140;&#152;/modifier/kotlin_2" d="M16 16H9V9H16L12.4 12.4L16 16Z" fill="#B99BF8"/>
+</g>
+</g>
+</svg>
diff --git a/plugins/base/src/main/resources/dokka/styles/style.css b/plugins/base/src/main/resources/dokka/styles/style.css
index 30f3b176..ab48a7db 100644
--- a/plugins/base/src/main/resources/dokka/styles/style.css
+++ b/plugins/base/src/main/resources/dokka/styles/style.css
@@ -913,6 +913,10 @@ code:not(.block) {
     content: url("../images/nav-icons/object.svg");
 }
 
+.nav-icon.typealias-kt::before {
+    content: url("../images/nav-icons/typealias-kotlin.svg");
+}
+
 .nav-icon.val::before {
     content: url("../images/nav-icons/field-value.svg");
 }
diff --git a/plugins/base/src/test/kotlin/content/functions/ContentForBriefTest.kt b/plugins/base/src/test/kotlin/content/functions/ContentForBriefTest.kt
index f86506af..c09a0e4d 100644
--- a/plugins/base/src/test/kotlin/content/functions/ContentForBriefTest.kt
+++ b/plugins/base/src/test/kotlin/content/functions/ContentForBriefTest.kt
@@ -4,6 +4,7 @@ import org.jetbrains.dokka.base.testApi.testRunner.BaseAbstractTest
 import org.jetbrains.dokka.links.DRI
 import org.jetbrains.dokka.links.TypeConstructor
 import org.jetbrains.dokka.model.DClass
+import org.jetbrains.dokka.model.DPackage
 import org.jetbrains.dokka.model.dfs
 import org.jetbrains.dokka.pages.*
 import org.junit.jupiter.api.Assertions.assertEquals
@@ -132,6 +133,32 @@ class ContentForBriefTest : BaseAbstractTest() {
     }
 
     @Test
+    fun `brief should work for typealias`() {
+        testInline(
+            """
+            |/src/main/kotlin/test/source.kt
+            |package test
+            |
+            |/**
+            |* This is an example <!-- not visible --> of html
+            |*
+            |* This is definitely not a brief
+            |*/
+            |typealias A = Int
+        """.trimIndent(),
+            testConfiguration
+        ) {
+            pagesTransformationStage = { module ->
+                val functionBriefDocs = module.singleTypeAliasesDescription("test")
+
+                assertEquals(
+                    "This is an example <!-- not visible --> of html",
+                    functionBriefDocs.children.joinToString("") { (it as ContentText).text })
+            }
+        }
+    }
+
+    @Test
     fun `brief for functions should work with html`() {
         testInline(
             """
@@ -344,4 +371,14 @@ class ContentForBriefTest : BaseAbstractTest() {
         val function = functionsTable.children.first()
         return function.dfs { it is ContentGroup && it.dci.kind == ContentKind.Comment && it.children.all { it is ContentText } } as ContentGroup
     }
+    private fun RootPageNode.singleTypeAliasesDescription(packageName: String): ContentGroup {
+        val packagePage =
+            dfs { it.name == packageName && (it as WithDocumentables).documentables.firstOrNull() is DPackage } as ContentPage
+        val contentTable =
+            packagePage.content.dfs { it is ContentTable && it.dci.kind == ContentKind.Classlikes } as ContentTable
+
+        assertEquals(1, contentTable.children.size)
+        val row = contentTable.children.first()
+        return row.dfs { it is ContentGroup && it.dci.kind == ContentKind.Comment && it.children.all { it is ContentText } } as ContentGroup
+    }
 }
\ No newline at end of file
diff --git a/plugins/base/src/test/kotlin/content/typealiases/TypealiasTest.kt b/plugins/base/src/test/kotlin/content/typealiases/TypealiasTest.kt
new file mode 100644
index 00000000..c2f58cb9
--- /dev/null
+++ b/plugins/base/src/test/kotlin/content/typealiases/TypealiasTest.kt
@@ -0,0 +1,78 @@
+package content.typealiases
+
+import matchers.content.*
+import org.jetbrains.dokka.base.testApi.testRunner.BaseAbstractTest
+import org.jetbrains.dokka.model.dfs
+import org.jetbrains.dokka.pages.*
+import org.junit.jupiter.api.Test
+import utils.assertNotNull
+
+
+class TypealiasTest : BaseAbstractTest() {
+    private val configuration = dokkaConfiguration {
+        sourceSets {
+            sourceSet {
+                sourceRoots = listOf("src/")
+                classpath = listOf(commonStdlibPath!!)
+                externalDocumentationLinks = listOf(stdlibExternalDocumentationLink)
+            }
+        }
+    }
+
+    @Test
+    fun `typealias should have a dedicated page with full documentation`() {
+        testInline(
+            """
+            |/src/main/kotlin/test/Test.kt
+            |package example
+            |
+            | /**
+            | * Brief text
+            | *
+            | * some text
+            | *
+            | * @see String
+            | * @throws Unit
+            | */
+            | typealias A = String
+            """,
+            configuration
+        ) {
+            pagesTransformationStage = { module ->
+                val content = (module.dfs { it.name == "A" } as ClasslikePageNode).content
+                val platformHinted = content.dfs { it is PlatformHintedContent }
+                platformHinted.assertNotNull("platformHinted").assertNode {
+                    group {
+                        group {
+                            group {
+                                +"typealias "
+                                group { group { link { +"A" } } }
+                                +" = "
+                                group { link { +"String" } }
+                            }
+                        }
+
+                        group {
+                            group {
+                                group {
+                                    group { +"Brief text" }
+                                    group { +"some text" }
+                                }
+                            }
+                        }
+
+                        header { +"See also" }
+                        table {
+                            group { link { +"String" } }
+                        }
+
+                        header { +"Throws" }
+                        table {
+                            group { group { link { +"Unit" } } }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/plugins/base/src/test/kotlin/renderers/html/NavigationIconTest.kt b/plugins/base/src/test/kotlin/renderers/html/NavigationIconTest.kt
index a7a7bacf..e83f70d5 100644
--- a/plugins/base/src/test/kotlin/renderers/html/NavigationIconTest.kt
+++ b/plugins/base/src/test/kotlin/renderers/html/NavigationIconTest.kt
@@ -37,7 +37,7 @@ class NavigationIconTest : BaseAbstractTest() {
                     .filterKeys { it.startsWith("images/nav-icons") }
                     .keys.sorted()
 
-                assertEquals(15, navIconAssets.size)
+                assertEquals(16, navIconAssets.size)
                 assertEquals("images/nav-icons/abstract-class-kotlin.svg", navIconAssets[0])
                 assertEquals("images/nav-icons/abstract-class.svg", navIconAssets[1])
                 assertEquals("images/nav-icons/annotation-kotlin.svg", navIconAssets[2])
@@ -53,6 +53,7 @@ class NavigationIconTest : BaseAbstractTest() {
                 assertEquals("images/nav-icons/interface-kotlin.svg", navIconAssets[12])
                 assertEquals("images/nav-icons/interface.svg", navIconAssets[13])
                 assertEquals("images/nav-icons/object.svg", navIconAssets[14])
+                assertEquals("images/nav-icons/typealias-kotlin.svg", navIconAssets[15])
             }
         }
     }
@@ -100,6 +101,15 @@ class NavigationIconTest : BaseAbstractTest() {
     }
 
     @Test
+    fun `should add icon styles to kotlin typealias navigation item`() {
+        assertNavigationIcon(
+            source = kotlinSource("typealias KotlinTypealias = String"),
+            expectedIconClass = "typealias-kt",
+            expectedNavLinkText = "KotlinTypealias"
+        )
+    }
+
+    @Test
     fun `should add icon styles to kotlin enum navigation item`() {
         assertNavigationIcon(
             source = kotlinSource("enum class KotlinEnum {}"),
diff --git a/plugins/base/src/test/kotlin/signatures/SignatureTest.kt b/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
index 3a263fd0..d271be2e 100644
--- a/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
+++ b/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
@@ -603,7 +603,7 @@ class SignatureTest : BaseAbstractTest() {
             pluginOverrides = listOf(writerPlugin)
         ) {
             renderingStage = { _, _ ->
-                writerPlugin.writer.renderedContent("root/example.html").firstSignature().match(
+                writerPlugin.writer.renderedContent("root/example/index.html").firstSignature().match(
                     "typealias ", A("PlainTypealias"), " = ", A("Int"),
                         ignoreSpanWithTokenStyle = true
                 )
@@ -663,7 +663,7 @@ class SignatureTest : BaseAbstractTest() {
             pluginOverrides = listOf(writerPlugin)
         ) {
             renderingStage = { _, _ ->
-                writerPlugin.writer.renderedContent("root/example.html").firstSignature().match(
+                writerPlugin.writer.renderedContent("root/example/index.html").firstSignature().match(
                     "typealias ", A("PlainTypealias"), " = ", A("Comparable"),
                     "<", A("Int"), ">",
                         ignoreSpanWithTokenStyle = true
@@ -690,7 +690,7 @@ class SignatureTest : BaseAbstractTest() {
             pluginOverrides = listOf(writerPlugin)
         ) {
             renderingStage = { _, _ ->
-                writerPlugin.writer.renderedContent("root/example.html").firstSignature().match(
+                writerPlugin.writer.renderedContent("root/example/index.html").firstSignature().match(
                     "typealias ", A("GenericTypealias"), "<", A("T"), "> = ", A("Comparable"),
                     "<", A("T"), ">",
                         ignoreSpanWithTokenStyle = true
diff --git a/plugins/base/src/test/kotlin/transformers/MergeImplicitExpectActualDeclarationsTest.kt b/plugins/base/src/test/kotlin/transformers/MergeImplicitExpectActualDeclarationsTest.kt
index 5e335209..241fb481 100644
--- a/plugins/base/src/test/kotlin/transformers/MergeImplicitExpectActualDeclarationsTest.kt
+++ b/plugins/base/src/test/kotlin/transformers/MergeImplicitExpectActualDeclarationsTest.kt
@@ -114,6 +114,38 @@ class MergeImplicitExpectActualDeclarationsTest : BaseAbstractTest() {
     }
 
     @Test
+    fun `should merge class and typealias`() {
+        testInline(
+            """
+                |/src/jvmMain/kotlin/pageMerger/Test.kt
+                |package pageMerger
+                |
+                |class A {
+                |   fun method1(): String
+                |}
+                |
+                |/src/jsMain/kotlin/pageMerger/Test.kt
+                |package pageMerger
+                |
+                |typealias A = String
+                |
+        """.trimMargin(),
+            configuration(true),
+            cleanupOutput = true
+        ) {
+            pagesTransformationStage = { root ->
+                val classPage = root.dfs { it.name == "A" } as? ClasslikePageNode
+                assertNotNull(classPage, "Tested class not found!")
+
+                val platformHintedContent = classPage.content.dfs { it is PlatformHintedContent }.assertNotNull("platformHintedContent")
+                assertEquals(2, platformHintedContent.sourceSets.size)
+
+                platformHintedContent.dfs { it is ContentText && it.text == "class " }.assertNotNull("class keyword")
+                platformHintedContent.dfs { it is ContentText && it.text == "typealias " }.assertNotNull("typealias keyword")
+            }
+        }
+    }
+    @Test
     fun `should merge method and prop`() {
         testInline(
             """