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path: root/core/src/main/kotlin/pages/PageBuilder.kt
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package org.jetbrains.dokka.pages

import model.doc.DocType
import org.jetbrains.dokka.model.*
import org.jetbrains.dokka.model.Function

class DefaultPageBuilder(
    override val rootContentGroup: RootContentBuilder
) : PageBuilder {

    override fun pageForModule(m: Module): ModulePageNode =
        ModulePageNode("root", contentForModule(m), m, m.packages.map { pageForPackage(it) })

    override fun pageForPackage(p: Package) =
        PackagePageNode(p.name, contentForPackage(p), p.dri, p,
            p.classes.map { pageForClass(it) } +
                    p.functions.map { pageForMember(it) } +
                    p.properties.map { pageForMember(it) })

    override fun pageForClass(c: Class): ClassPageNode =
        ClassPageNode(c.name, contentForClass(c), c.dri, c,
            c.constructors.map { pageForMember(it) } +
                    c.classes.map { pageForClass(it) } +
                    c.functions.map { pageForMember(it) })

    override fun pageForMember(m: CallableNode): MemberPageNode =
        when (m) {
            is Function ->
                MemberPageNode(m.name, contentForFunction(m), m.dri, m)
            else -> throw IllegalStateException("$m should not be present here")
        }

    private fun group(node: Documentable, content: PageContentBuilderFunction) =
        rootContentGroup(node, ContentKind.Main, content)

    private fun contentForModule(m: Module) = group(m) {
        header(1) { text("root") }
        block("Packages", 2, ContentKind.Packages, m.packages, m.platformData) {
            link(it.name, it.dri)
        }
        text("Index\n")
        text("Link to allpage here")
    }

    private fun contentForPackage(p: Package) = group(p) {
        header(1) { text("Package ${p.name}") }
        block("Types", 2, ContentKind.Properties, p.classes, p.platformData) {
            link(it.name, it.dri)
            text(it.briefDocstring)
        }
        block("Functions", 2, ContentKind.Functions, p.functions, p.platformData) {
            link(it.name, it.dri)
            signature(it)
            text(it.briefDocstring)
        }
    }

    private fun contentForClass(c: Class) = group(c) {
        header(1) { text(c.name) }
        c.inherited.takeIf { it.isNotEmpty() }?.let {
            header(2) { text("SuperInterfaces") }
            linkTable(it)
        }
        c.commentsData.forEach {
            it.children.forEach {
                header(3) { text(it.toHeaderString()) }
                comment(it.root)
                text("\n")
            }
        }
        block("Constructors", 2, ContentKind.Functions, c.constructors, c.platformData) {
            link(it.name, it.dri)
            signature(it)
            text(it.briefDocstring)
        }
        block("Functions", 2, ContentKind.Functions, c.functions, c.platformData) {
            link(it.name, it.dri)
            signature(it)
            text(it.briefDocstring)
        }
        block("Properties", 2, ContentKind.Properties, c.properties, c.platformData) {
            link(it.name, it.dri)
            text(it.briefDocstring)
        }
    }

    private fun contentForFunction(f: Function) = group(f) {
        header(1) { text(f.name) }
        signature(f)
        f.commentsData.forEach { it.children.forEach { comment(it.root) } }
        block("Parameters", 2, ContentKind.Parameters, f.children, f.platformData) {
            text(it.name ?: "<receiver>")
            it.commentsData.forEach { it.children.forEach { comment(it.root) } }
        }
    }

    private fun DocType.toHeaderString() = this.javaClass.toGenericString().split('.').last()
}

typealias RootContentBuilder = (Documentable, Kind, PageContentBuilderFunction) -> ContentGroup

interface PageBuilder {
    val rootContentGroup: RootContentBuilder
    fun pageForModule(m: Module): ModulePageNode
    fun pageForPackage(p: Package): PackagePageNode
    fun pageForMember(m: CallableNode): MemberPageNode
    fun pageForClass(c: Class): ClassPageNode
}