DefaultPageCreator.kt

package org.jetbrains.dokka.base.translators.documentables

import org.jetbrains.dokka.base.signatures.SignatureProvider
import org.jetbrains.dokka.base.transformers.documentables.CallableExtensions
import org.jetbrains.dokka.base.transformers.documentables.InheritorsInfo
import org.jetbrains.dokka.base.transformers.pages.comments.CommentsToContentConverter
import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder.DocumentableContentBuilder
import org.jetbrains.dokka.links.DRI
import org.jetbrains.dokka.model.*
import org.jetbrains.dokka.model.doc.*
import org.jetbrains.dokka.model.properties.PropertyContainer
import org.jetbrains.dokka.model.properties.WithExtraProperties
import org.jetbrains.dokka.pages.*
import org.jetbrains.dokka.utilities.DokkaLogger
import org.jetbrains.kotlin.utils.addToStdlib.safeAs
import kotlin.reflect.KClass
import kotlin.reflect.full.isSubclassOf
import org.jetbrains.dokka.DokkaConfiguration.DokkaSourceSet
import org.jetbrains.dokka.base.DokkaBaseConfiguration
import org.jetbrains.dokka.base.resolvers.anchors.SymbolAnchorHint
import org.jetbrains.dokka.base.transformers.documentables.ClashingDriIdentifier

private typealias GroupedTags = Map<KClass<out TagWrapper>, List<Pair<DokkaSourceSet?, TagWrapper>>>

private val specialTags: Set<KClass<out TagWrapper>> =
    setOf(Property::class, Description::class, Constructor::class, Param::class, See::class)

open class DefaultPageCreator(
    configuration: DokkaBaseConfiguration?,
    commentsToContentConverter: CommentsToContentConverter,
    signatureProvider: SignatureProvider,
    val logger: DokkaLogger
) {
    protected open val contentBuilder = PageContentBuilder(commentsToContentConverter, signatureProvider, logger)

    protected val separateInheritedMembers =
        configuration?.separateInheritedMembers ?: DokkaBaseConfiguration.separateInheritedMembersDefault

    open fun pageForModule(m: DModule) =
        ModulePageNode(m.name.ifEmpty { "<root>" }, contentForModule(m), m, m.packages.map(::pageForPackage))

    open fun pageForPackage(p: DPackage): PackagePageNode = PackagePageNode(
        p.name, contentForPackage(p), setOf(p.dri), p,
        p.classlikes.renameClashingDocumentable().map(::pageForClasslike) +
                p.functions.renameClashingDocumentable()
                    .map(::pageForFunction) + p.properties.mapNotNull(::pageForProperty)
    )

    open fun pageForEnumEntry(e: DEnumEntry): ClasslikePageNode =
        ClasslikePageNode(
            e.nameAfterClash(), contentForEnumEntry(e), setOf(e.dri), e,
            e.classlikes.renameClashingDocumentable().map(::pageForClasslike) +
                    e.filteredFunctions.renameClashingDocumentable().map(::pageForFunction) +
                    e.filteredProperties.renameClashingDocumentable().mapNotNull(::pageForProperty)
        )

    open fun pageForClasslike(c: DClasslike): ClasslikePageNode {
        val constructors = if (c is WithConstructors) c.constructors else emptyList()

        return ClasslikePageNode(
            c.nameAfterClash(), contentForClasslike(c), setOf(c.dri), c,
            constructors.map(::pageForFunction) +
                    c.classlikes.renameClashingDocumentable().map(::pageForClasslike) +
                    c.filteredFunctions.renameClashingDocumentable().map(::pageForFunction) +
                    c.filteredProperties.renameClashingDocumentable().mapNotNull(::pageForProperty) +
                    if (c is DEnum) c.entries.map(::pageForEnumEntry) else emptyList()

        )
    }

    private fun <T> T.toClashedName() where T : Documentable, T : WithExtraProperties<T> =
        (extra[ClashingDriIdentifier]?.value?.joinToString(", ", "[", "]") { it.displayName } ?: "") + name.orEmpty()

    @Suppress("UNCHECKED_CAST")
    private fun <T : Documentable> List<T>.renameClashingDocumentable(): List<T> =
        groupBy { it.dri }.values.flatMap { elements ->
            if (elements.size == 1) elements else elements.mapNotNull { element ->
                when (element) {
                    is DClass -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DObject -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DAnnotation -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DInterface -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DEnum -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DFunction -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DProperty -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    is DTypeAlias -> element.copy(extra = element.extra + DriClashAwareName(element.toClashedName()))
                    else -> null
                } as? T?
            }
        }

    open fun pageForFunction(f: DFunction) = MemberPageNode(f.nameAfterClash(), contentForFunction(f), setOf(f.dri), f)

    open fun pageForProperty(p: DProperty): MemberPageNode? =
        MemberPageNode(p.nameAfterClash(), contentForProperty(p), setOf(p.dri), p)

    private fun <T> T.isInherited(): Boolean where T : Documentable, T : WithExtraProperties<T> =
        sourceSets.all { sourceSet -> extra[InheritedMember]?.isInherited(sourceSet) == true }

    private val WithScope.filteredFunctions: List<DFunction>
        get() = functions.filterNot { it.isInherited() }

    private val WithScope.filteredProperties: List<DProperty>
        get() = properties.filterNot { it.isInherited() }

    private fun <T> Collection<T>.splitInherited(): Pair<List<T>, List<T>> where T : Documentable, T : WithExtraProperties<T> =
        partition { it.isInherited() }

    protected open fun contentForModule(m: DModule) = contentBuilder.contentFor(m) {
        group(kind = ContentKind.Cover) {
            cover(m.name)
            if (contentForDescription(m).isNotEmpty()) {
                sourceSetDependentHint(
                    m.dri,
                    m.sourceSets.toSet(),
                    kind = ContentKind.SourceSetDependentHint,
                    styles = setOf(TextStyle.UnderCoverText)
                ) {
                    +contentForDescription(m)
                }
            }
        }
        +contentForComments(m)

        block(
            "Packages",
            2,
            ContentKind.Packages,
            m.packages,
            m.sourceSets.toSet(),
            needsAnchors = true,
            headers = listOf(
                headers("Name")
            )
        ) {
            val documentations = it.sourceSets.map { platform ->
                it.descriptions[platform]?.also { it.root }
            }
            val haveSameContent =
                documentations.all { it?.root == documentations.firstOrNull()?.root && it?.root != null }

            link(it.name, it.dri)
            if (it.sourceSets.size == 1 || (documentations.isNotEmpty() && haveSameContent)) {
                documentations.first()?.let { firstParagraphComment(kind = ContentKind.Comment, content = it.root) }
            }
        }
    }

    protected open fun contentForPackage(p: DPackage) = contentBuilder.contentFor(p) {
        group(kind = ContentKind.Cover) {
            cover("Package ${p.name}")
            if (contentForDescription(p).isNotEmpty()) {
                sourceSetDependentHint(
                    p.dri,
                    p.sourceSets.toSet(),
                    kind = ContentKind.SourceSetDependentHint,
                    styles = setOf(TextStyle.UnderCoverText)
                ) {
                    +contentForDescription(p)
                }
            }
        }
        group(styles = setOf(ContentStyle.TabbedContent)) {
            +contentForComments(p)
            +contentForScope(p, p.dri, p.sourceSets)
        }
    }

    protected open fun contentForScope(
        s: WithScope,
        dri: DRI,
        sourceSets: Set<DokkaSourceSet>
    ) = contentBuilder.contentFor(s as Documentable) {
        val types = listOf(
            s.classlikes,
            (s as? DPackage)?.typealiases ?: emptyList()
        ).flatten()
        divergentBlock("Types", types, ContentKind.Classlikes, extra = mainExtra + SimpleAttr.header("Types"))
        if (separateInheritedMembers) {
            val (inheritedFunctions, memberFunctions) = s.functions.splitInherited()
            val (inheritedProperties, memberProperties) = s.properties.splitInherited()
            propertiesBlock("Properties", memberProperties, sourceSets)
            propertiesBlock("Inherited properties", inheritedProperties, sourceSets)
            functionsBlock("Functions", memberFunctions)
            functionsBlock("Inherited functions", inheritedFunctions)
        } else {
            functionsBlock("Functions", s.functions)
            propertiesBlock("Properties", s.properties, sourceSets)
        }
        s.safeAs<WithExtraProperties<Documentable>>()?.let { it.extra[InheritorsInfo] }?.let { inheritors ->
            val map = inheritors.value.filter { it.value.isNotEmpty() }
            if (map.values.any()) {
                header(2, "Inheritors") { }
                +ContentTable(
                    header = listOf(contentBuilder.contentFor(mainDRI, mainSourcesetData) {
                        text("Name")
                    }),
                    children = map.entries.flatMap { entry -> entry.value.map { Pair(entry.key, it) } }
                        .groupBy({ it.second }, { it.first }).map { (classlike, platforms) ->
                            val label = classlike.classNames?.substringAfterLast(".") ?: classlike.toString()
                                .also { logger.warn("No class name found for DRI $classlike") }
                            buildGroup(
                                setOf(classlike),
                                platforms.toSet(),
                                ContentKind.Inheritors,
                                extra = mainExtra + SymbolAnchorHint(label, ContentKind.Inheritors)
                            ) {
                                link(label, classlike)
                            }
                        },
                    dci = DCI(setOf(dri), ContentKind.Inheritors),
                    sourceSets = sourceSets.toDisplaySourceSets(),
                    style = emptySet(),
                    extra = mainExtra + SimpleAttr.header("Inheritors")
                )
            }
        }
    }

    private fun Iterable<DFunction>.sorted() =
        sortedWith(compareBy({ it.name }, { it.parameters.size }, { it.dri.toString() }))

    protected open fun contentForEnumEntry(e: DEnumEntry) = contentBuilder.contentFor(e) {
        group(kind = ContentKind.Cover) {
            cover(e.name)
            sourceSetDependentHint(e.dri, e.sourceSets.toSet()) {
                +buildSignature(e)
                +contentForDescription(e)
            }
        }
        group(styles = setOf(ContentStyle.TabbedContent)) {
            +contentForComments(e)
            +contentForScope(e, e.dri, e.sourceSets)
        }
    }

    protected open fun contentForClasslike(c: DClasslike) = contentBuilder.contentFor(c) {
        @Suppress("UNCHECKED_CAST")
        val extensions = (c as WithExtraProperties<DClasslike>)
            .extra[CallableExtensions]?.extensions
            ?.filterIsInstance<Documentable>().orEmpty()
        // Extensions are added to sourceSets since they can be placed outside the sourceSets from classlike
        // Example would be an Interface in common and extension function in jvm
        group(kind = ContentKind.Cover, sourceSets = mainSourcesetData + extensions.sourceSets) {
            cover(c.name.orEmpty())
            sourceSetDependentHint(c.dri, c.sourceSets) {
                +buildSignature(c)
                +contentForDescription(c)
            }
        }

        group(styles = setOf(ContentStyle.TabbedContent), sourceSets = mainSourcesetData + extensions.sourceSets) {
            +contentForComments(c)
            if (c is WithConstructors) {
                block(
                    "Constructors",
                    2,
                    ContentKind.Constructors,
                    c.constructors,
                    c.sourceSets,
                    needsAnchors = true,
                    extra = PropertyContainer.empty<ContentNode>() + SimpleAttr.header("Constructors")
                ) {
                    link(it.name, it.dri, kind = ContentKind.Main)
                    sourceSetDependentHint(
                        it.dri,
                        it.sourceSets.toSet(),
                        kind = ContentKind.SourceSetDependentHint,
                        styles = emptySet(),
                        extra = PropertyContainer.empty<ContentNode>()
                    ) {
                        +buildSignature(it)
                        contentForBrief(it)
                    }
                }
            }
            if (c is DEnum) {
                block(
                    "Entries",
                    2,
                    ContentKind.Classlikes,
                    c.entries,
                    c.sourceSets.toSet(),
                    needsSorting = false,
                    needsAnchors = true,
                    extra = mainExtra + SimpleAttr.header("Entries"),
                    styles = emptySet()
                ) {
                    link(it.name, it.dri)
                    sourceSetDependentHint(
                        it.dri,
                        it.sourceSets.toSet(),
                        kind = ContentKind.SourceSetDependentHint,
                        extra = PropertyContainer.empty<ContentNode>()
                    ) {
                        +buildSignature(it)
                        contentForBrief(it)
                    }
                }
            }
            +contentForScope(c, c.dri, c.sourceSets)

            divergentBlock(
                "Extensions",
                extensions,
                ContentKind.Extensions,
                extra = mainExtra + SimpleAttr.header("Extensions")
            )
        }
    }

    @Suppress("UNCHECKED_CAST")
    private inline fun <reified T : TagWrapper> GroupedTags.withTypeUnnamed(): SourceSetDependent<T> =
        (this[T::class] as List<Pair<DokkaSourceSet, T>>?)?.toMap().orEmpty()

    @Suppress("UNCHECKED_CAST")
    private inline fun <reified T : NamedTagWrapper> GroupedTags.withTypeNamed(): Map<String, SourceSetDependent<T>> =
        (this[T::class] as List<Pair<DokkaSourceSet, T>>?)
            ?.groupByTo(linkedMapOf()) { it.second.name }
            ?.mapValues { (_, v) -> v.toMap() }
            .orEmpty()

    private inline fun <reified T : TagWrapper> GroupedTags.isNotEmptyForTag(): Boolean =
        this[T::class]?.isNotEmpty() ?: false

    protected open fun contentForDescription(
        d: Documentable
    ): List<ContentNode> {
        val tags: GroupedTags = d.groupedTags
        val platforms = d.sourceSets.toSet()

        return contentBuilder.contentFor(d, styles = setOf(TextStyle.Block)) {
            val descriptions = d.descriptions
            if (descriptions.any { it.value.root.children.isNotEmpty() }) {
                platforms.forEach { platform ->
                    descriptions[platform]?.also {
                        group(sourceSets = setOf(platform), styles = emptySet()) {
                            comment(it.root)
                        }
                    }
                }
            }

            val unnamedTags = tags.filterNot { (k, _) -> k.isSubclassOf(NamedTagWrapper::class) || k in specialTags }
                .values.flatten().groupBy { it.first }.mapValues { it.value.map { it.second } }
            if (unnamedTags.isNotEmpty()) {
                platforms.forEach { platform ->
                    unnamedTags[platform]?.let { tags ->
                        if (tags.isNotEmpty()) {
                            tags.groupBy { it::class }.forEach { (_, sameCategoryTags) ->
                                group(sourceSets = setOf(platform), styles = emptySet()) {
                                    header(4, sameCategoryTags.first().toHeaderString())
                                    sameCategoryTags.forEach { comment(it.root) }
                                }
                            }
                        }
                    }
                }
            }

            contentForSinceKotlin(d)
        }.children
    }

    private fun Documentable.getPossibleFallbackSourcesets(sourceSet: DokkaSourceSet) =
        this.sourceSets.filter { it.sourceSetID in sourceSet.dependentSourceSets }

    private fun <V> Map<DokkaSourceSet, V>.fallback(sourceSets: List<DokkaSourceSet>): V? =
        sourceSets.firstOrNull { it in this.keys }.let { this[it] }

    protected open fun contentForComments(
        d: Documentable,
        isPlatformHintedContent: Boolean = true
    ): List<ContentNode> {
        val tags = d.groupedTags

        fun DocumentableContentBuilder.buildContent(
            platforms: Set<DokkaSourceSet>,
            contentBuilder: DocumentableContentBuilder.() -> Unit
        ) = if (isPlatformHintedContent)
            sourceSetDependentHint(
                sourceSets = platforms,
                kind = ContentKind.SourceSetDependentHint,
                block = contentBuilder
            )
        else
            contentBuilder()

        fun DocumentableContentBuilder.contentForParams() {
            if (tags.isNotEmptyForTag<Param>()) {
                val params = tags.withTypeNamed<Param>()
                val availablePlatforms = params.values.flatMap { it.keys }.toSet()

                header(2, "Parameters", kind = ContentKind.Parameters, sourceSets = availablePlatforms)
                group(
                    extra = mainExtra + SimpleAttr.header("Parameters"),
                    styles = setOf(ContentStyle.WithExtraAttributes),
                    sourceSets = availablePlatforms
                ) {
                    buildContent(availablePlatforms) {
                        table(kind = ContentKind.Parameters, sourceSets = availablePlatforms) {
                            availablePlatforms.forEach { platform ->
                                val possibleFallbacks = d.getPossibleFallbackSourcesets(platform)
                                params.mapNotNull { (_, param) ->
                                    (param[platform] ?: param.fallback(possibleFallbacks))?.let {
                                        row(sourceSets = setOf(platform), kind = ContentKind.Parameters) {
                                            text(
                                                it.name,
                                                kind = ContentKind.Parameters,
                                                styles = mainStyles + ContentStyle.RowTitle
                                            )
                                            comment(it.root)
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        fun DocumentableContentBuilder.contentForSeeAlso() {
            if (tags.isNotEmptyForTag<See>()) {
                val seeAlsoTags = tags.withTypeNamed<See>()
                val availablePlatforms = seeAlsoTags.values.flatMap { it.keys }.toSet()

                header(2, "See also", kind = ContentKind.Comment, sourceSets = availablePlatforms)
                group(
                    extra = mainExtra + SimpleAttr.header("See also"),
                    styles = setOf(ContentStyle.WithExtraAttributes),
                    sourceSets = availablePlatforms
                ) {
                    buildContent(availablePlatforms) {
                        table(kind = ContentKind.Sample) {
                            availablePlatforms.forEach { platform ->
                                val possibleFallbacks = d.getPossibleFallbackSourcesets(platform)
                                seeAlsoTags.forEach { (_, see) ->
                                    (see[platform] ?: see.fallback(possibleFallbacks))?.let {
                                        row(
                                            sourceSets = setOf(platform),
                                            kind = ContentKind.Comment,
                                            styles = this@group.mainStyles,
                                        ) {
                                            it.address?.let { dri ->
                                                link(
                                                    it.name,
                                                    dri,
                                                    kind = ContentKind.Comment,
                                                    styles = mainStyles + ContentStyle.RowTitle
                                                )
                                            } ?: text(
                                                it.name,
                                                kind = ContentKind.Comment,
                                                styles = mainStyles + ContentStyle.RowTitle
                                            )
                                            comment(it.root)
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        fun DocumentableContentBuilder.contentForThrows() {
            val throws = tags.withTypeNamed<Throws>()
            if (throws.isNotEmpty()) {
                val availablePlatforms = throws.values.flatMap { it.keys }.toSet()

                header(2, "Throws", sourceSets = availablePlatforms)
                buildContent(availablePlatforms) {
                    availablePlatforms.forEach { sourceset ->
                        table(kind = ContentKind.Main, sourceSets = setOf(sourceset)) {
                            throws.entries.forEach { entry ->
                                entry.value[sourceset]?.let { throws ->
                                    row(sourceSets = setOf(sourceset)) {
                                        group(styles = mainStyles + ContentStyle.RowTitle) {
                                            throws.exceptionAddress?.let {
                                                link(text = entry.key, address = it)
                                            } ?: text(entry.key)
                                        }
                                        comment(throws.root)
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        fun DocumentableContentBuilder.contentForSamples() {
            val samples = tags.withTypeNamed<Sample>()
            if (samples.isNotEmpty()) {
                val availablePlatforms = samples.values.flatMap { it.keys }.toSet()
                header(2, "Samples", kind = ContentKind.Sample, sourceSets = availablePlatforms)
                group(
                    extra = mainExtra + SimpleAttr.header("Samples"),
                    styles = emptySet(),
                    sourceSets = availablePlatforms
                ) {
                    buildContent(availablePlatforms) {
                        availablePlatforms.map { platformData ->
                            val content = samples.filter { it.value.isEmpty() || platformData in it.value }
                            group(
                                sourceSets = setOf(platformData),
                                kind = ContentKind.Sample,
                                styles = setOf(TextStyle.Monospace, ContentStyle.RunnableSample)
                            ) {
                                content.forEach {
                                    text(it.key)
                                }
                            }
                        }
                    }
                }
            }
        }

        return contentBuilder.contentFor(d) {
            if (tags.isNotEmpty()) {
                contentForSamples()
                contentForSeeAlso()
                if (d !is DProperty)
                    contentForParams()
                contentForThrows()
            }
        }.children
    }

    protected open fun DocumentableContentBuilder.contentForBrief(documentable: Documentable) {
        documentable.sourceSets.forEach { sourceSet ->
            documentable.documentation[sourceSet]?.let {
                /*
                    Get description or a tag that holds documentation.
                    This tag can be either property or constructor but constructor tags are handled already in analysis so we
                    only need to keep an eye on property

                    We purposefully ignore all other tags as they should not be visible in brief
                 */
                it.firstMemberOfTypeOrNull<Description>() ?: it.firstMemberOfTypeOrNull<Property>().takeIf { documentable is DProperty }
            }?.let {
                group(sourceSets = setOf(sourceSet), kind = ContentKind.BriefComment) {
                    if (documentable.hasSeparatePage) createBriefComment(documentable, sourceSet, it)
                    else comment(it.root)
                }
            }
        }
    }

    private fun DocumentableContentBuilder.createBriefComment(documentable: Documentable, sourceSet: DokkaSourceSet, tag: TagWrapper){
        (documentable as? WithSources)?.documentableLanguage(sourceSet)?.let {
            when(it){
                DocumentableLanguage.KOTLIN -> firstParagraphComment(tag.root)
                DocumentableLanguage.JAVA -> firstSentenceComment(tag.root)
            }
        } ?: firstParagraphComment(tag.root)
    }

    protected open fun DocumentableContentBuilder.contentForSinceKotlin(documentable: Documentable) {
        documentable.documentation.mapValues {
            it.value.children.find { it is CustomTagWrapper && it.name == "Since Kotlin" } as CustomTagWrapper?
        }.run {
            documentable.sourceSets.forEach { sourceSet ->
                this[sourceSet]?.also { tag ->
                    group(sourceSets = setOf(sourceSet), kind = ContentKind.Comment, styles = setOf(TextStyle.Block)) {
                        header(4, tag.name)
                        comment(tag.root)
                    }
                }
            }
        }
    }

    protected open fun contentForFunction(f: DFunction) = contentForMember(f)

    protected open fun contentForProperty(p: DProperty) = contentForMember(p)

    protected open fun contentForMember(d: Documentable) = contentBuilder.contentFor(d) {
        group(kind = ContentKind.Cover) {
            cover(d.name.orEmpty())
        }
        divergentGroup(ContentDivergentGroup.GroupID("member")) {
            instance(setOf(d.dri), d.sourceSets.toSet()) {
                divergent {
                    +buildSignature(d)
                }
                after {
                    +contentForDescription(d)
                    +contentForComments(d, isPlatformHintedContent = false)
                }
            }
        }
    }

    private fun DocumentableContentBuilder.functionsBlock(name: String, list: Collection<DFunction>) = divergentBlock(
        name,
        list.sorted(),
        ContentKind.Functions,
        extra = mainExtra + SimpleAttr.header(name)
    )

    private fun DocumentableContentBuilder.propertiesBlock(
        name: String,
        list: Collection<DProperty>,
        sourceSets: Set<DokkaSourceSet>
    ) {
        block(
            name,
            2,
            ContentKind.Properties,
            list,
            sourceSets,
            needsAnchors = true,
            extra = mainExtra + SimpleAttr.header(name),
            headers = listOf(
                headers("Name", "Summary")
            )
        ) {
            link(it.name, it.dri, kind = ContentKind.Main)
            sourceSetDependentHint(it.dri, it.sourceSets.toSet(), kind = ContentKind.SourceSetDependentHint) {
                +buildSignature(it)
                contentForBrief(it)
            }
        }
    }

    protected open fun DocumentableContentBuilder.divergentBlock(
        name: String,
        collection: Collection<Documentable>,
        kind: ContentKind,
        extra: PropertyContainer<ContentNode> = mainExtra
    ) {
        if (collection.any()) {
            header(2, name, kind = kind)
            table(kind, extra = extra, styles = emptySet()) {
                header {
                    group { text("Name") }
                    group { text("Summary") }
                }
                collection
                    .groupBy { it.name } // This groupBy should probably use LocationProvider
                    // This hacks displaying actual typealias signatures along classlike ones
                    .mapValues { if (it.value.any { it is DClasslike }) it.value.filter { it !is DTypeAlias } else it.value }
                    .toSortedMap(compareBy(nullsLast(String.CASE_INSENSITIVE_ORDER)) { it })
                    .forEach { (elementName, elements) -> // This groupBy should probably use LocationProvider
                        row(
                            dri = elements.map { it.dri }.toSet(),
                            sourceSets = elements.flatMap { it.sourceSets }.toSet(),
                            kind = kind,
                            styles = emptySet(),
                            extra = elementName?.let { name -> extra + SymbolAnchorHint(name, kind) } ?: extra
                        ) {
                            link(
                                text = elementName.orEmpty(),
                                address = elements.first().dri,
                                kind = kind,
                                styles = setOf(ContentStyle.RowTitle),
                                sourceSets = elements.sourceSets.toSet(),
                                extra = extra
                            )
                            divergentGroup(
                                ContentDivergentGroup.GroupID(name),
                                elements.map { it.dri }.toSet(),
                                kind = kind,
                                extra = extra
                            ) {
                                elements.map {
                                    instance(
                                        setOf(it.dri),
                                        it.sourceSets.toSet(),
                                        extra = PropertyContainer.withAll(SymbolAnchorHint(it.name ?: "", kind))
                                    ) {
                                        divergent(extra = PropertyContainer.empty()) {
                                            group {
                                                +buildSignature(it)
                                            }
                                        }
                                        after(extra = PropertyContainer.empty()) {
                                            contentForBrief(it)
                                            contentForSinceKotlin(it)
                                        }
                                    }
                                }
                            }
                        }
                    }
            }
        }
    }


    protected open fun TagWrapper.toHeaderString() = this.javaClass.toGenericString().split('.').last()

    private val List<Documentable>.sourceSets: Set<DokkaSourceSet>
        get() = flatMap { it.sourceSets }.toSet()

    private val Documentable.groupedTags: GroupedTags
        get() = documentation.flatMap { (pd, doc) ->
            doc.children.asSequence().map { pd to it }.toList()
        }.groupBy { it.second::class }

    private val Documentable.descriptions: SourceSetDependent<Description>
        get() = groupedTags.withTypeUnnamed<Description>()

    private val Documentable.hasSeparatePage: Boolean
        get() = this !is DTypeAlias

    private fun <T : Documentable> T.nameAfterClash(): String =
        ((this as? WithExtraProperties<out Documentable>)?.extra?.get(DriClashAwareName)?.value ?: name).orEmpty()
}