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package org.jetbrains.dokka.plugability
import org.jetbrains.dokka.DokkaConfiguration
import org.jetbrains.dokka.utilities.DokkaLogger
import java.io.File
import java.net.URLClassLoader
import java.util.*
import kotlin.reflect.KClass
import kotlin.reflect.full.createInstance
interface DokkaContext {
fun <T : DokkaPlugin> plugin(kclass: KClass<T>): T?
operator fun <T, E> get(point: E): List<T>
where T : Any, E : ExtensionPoint<T>
fun <T, E> single(point: E): T where T : Any, E : ExtensionPoint<T>
val logger: DokkaLogger
val configuration: DokkaConfiguration
val unusedPoints: Collection<ExtensionPoint<*>>
companion object {
fun create(
configuration: DokkaConfiguration,
logger: DokkaLogger,
pluginOverrides: List<DokkaPlugin>
): DokkaContext =
DokkaContextConfigurationImpl(logger, configuration).apply {
// File(it.path) is a workaround for an incorrect filesystem in a File instance returned by Gradle.
configuration.pluginsClasspath.map { File(it.path).toURI().toURL() }
.toTypedArray()
.let { URLClassLoader(it, this.javaClass.classLoader) }
.also { checkClasspath(it) }
.let { ServiceLoader.load(DokkaPlugin::class.java, it) }
.let { it + pluginOverrides }
.forEach { install(it) }
topologicallySortAndPrune()
}.also { it.logInitialisationInfo() }
}
}
inline fun <reified T : DokkaPlugin> DokkaContext.plugin(): T = plugin(T::class)
?: throw java.lang.IllegalStateException("Plugin ${T::class.qualifiedName} is not present in context.")
fun interface DokkaContextConfiguration {
fun installExtension(extension: Extension<*, *, *>)
}
private class DokkaContextConfigurationImpl(
override val logger: DokkaLogger,
override val configuration: DokkaConfiguration
) : DokkaContext, DokkaContextConfiguration {
private val plugins = mutableMapOf<KClass<*>, DokkaPlugin>()
private val pluginStubs = mutableMapOf<KClass<*>, DokkaPlugin>()
val extensions = mutableMapOf<ExtensionPoint<*>, MutableList<Extension<*, *, *>>>()
val pointsUsed: MutableSet<ExtensionPoint<*>> = mutableSetOf()
val pointsPopulated: MutableSet<ExtensionPoint<*>> = mutableSetOf()
override val unusedPoints: Set<ExtensionPoint<*>>
get() = pointsPopulated - pointsUsed
private enum class State {
UNVISITED,
VISITING,
VISITED;
}
private sealed class Suppression {
data class ByExtension(val extension: Extension<*, *, *>) : Suppression() {
override fun toString() = extension.toString()
}
data class ByPlugin(val plugin: DokkaPlugin) : Suppression() {
override fun toString() = "Plugin ${plugin::class.qualifiedName}"
}
}
private val rawExtensions = mutableListOf<Extension<*, *, *>>()
private val rawAdjacencyList = mutableMapOf<Extension<*, *, *>, MutableList<Extension<*, *, *>>>()
private val suppressedExtensions = mutableMapOf<Extension<*, *, *>, MutableList<Suppression>>()
fun topologicallySortAndPrune() {
pointsPopulated.clear()
extensions.clear()
val overridesInfo = processOverrides()
val extensionsToSort = overridesInfo.keys
val adjacencyList = translateAdjacencyList(overridesInfo)
val verticesWithState = extensionsToSort.associateWithTo(mutableMapOf()) { State.UNVISITED }
val result: MutableList<Extension<*, *, *>> = mutableListOf()
fun visit(n: Extension<*, *, *>) {
val state = verticesWithState[n]
if (state == State.VISITED)
return
if (state == State.VISITING)
throw Error("Detected cycle in plugins graph")
verticesWithState[n] = State.VISITING
adjacencyList[n]?.forEach { visit(it) }
verticesWithState[n] = State.VISITED
result += n
}
extensionsToSort.forEach(::visit)
val filteredResult = result.asReversed().filterNot { it in suppressedExtensions }
filteredResult.mapTo(pointsPopulated) { it.extensionPoint }
filteredResult.groupByTo(extensions) { it.extensionPoint }
}
private fun processOverrides(): Map<Extension<*, *, *>, Set<Extension<*, *, *>>> {
val buckets = rawExtensions.associateWithTo(mutableMapOf()) { setOf(it) }
suppressedExtensions.forEach { (extension, suppressions) ->
val mergedBucket = suppressions.filterIsInstance<Suppression.ByExtension>()
.map { it.extension }
.plus(extension)
.flatMap { buckets[it].orEmpty() }
.toSet()
mergedBucket.forEach { buckets[it] = mergedBucket }
}
return buckets.values.distinct().associateBy(::findNotOverridden)
}
private fun findNotOverridden(bucket: Set<Extension<*, *, *>>): Extension<*, *, *> {
// Let's filter out all suppressedExtensions that are not only overrides.
// suppressedExtensions can be polluted by suppressions that completely disables the extension, and would break dokka behaviour
// if not filtered out
val suppressedExtensionsByOverrides = suppressedExtensions.filterNot { it.value.any { it !is Suppression.ByExtension } }
val filtered = bucket.filterNot { it in suppressedExtensionsByOverrides }
return filtered.singleOrNull()
?: throw IllegalStateException("Conflicting overrides: $filtered")
}
private fun translateAdjacencyList(
overridesInfo: Map<Extension<*, *, *>, Set<Extension<*, *, *>>>
): Map<Extension<*, *, *>, List<Extension<*, *, *>>> {
val reverseOverrideInfo = overridesInfo.flatMap { (ext, set) -> set.map { it to ext } }.toMap()
return rawAdjacencyList.mapNotNull { (ext, list) ->
reverseOverrideInfo[ext]?.to(list.mapNotNull { reverseOverrideInfo[it] })
}.toMap()
}
@Suppress("UNCHECKED_CAST")
override operator fun <T, E> get(point: E) where T : Any, E : ExtensionPoint<T> =
actions(point).also { pointsUsed += point }.orEmpty() as List<T>
@Suppress("UNCHECKED_CAST")
override fun <T, E> single(point: E): T where T : Any, E : ExtensionPoint<T> {
fun throwBadArity(substitution: String): Nothing = throw IllegalStateException(
"$point was expected to have exactly one extension registered, but $substitution found."
)
pointsUsed += point
val extensions = extensions[point].orEmpty() as List<Extension<T, *, *>>
return when (extensions.size) {
0 -> throwBadArity("none was")
1 -> extensions.single().action.get(this)
else -> throwBadArity("many were")
}
}
private fun <E : ExtensionPoint<*>> actions(point: E) = extensions[point]?.map { it.action.get(this) }
@Suppress("UNCHECKED_CAST")
override fun <T : DokkaPlugin> plugin(kclass: KClass<T>) = (plugins[kclass] ?: pluginStubFor(kclass)) as T
private fun <T : DokkaPlugin> pluginStubFor(kclass: KClass<T>): DokkaPlugin =
pluginStubs.getOrPut(kclass) { kclass.createInstance().also { it.context = this } }
fun install(plugin: DokkaPlugin) {
plugins[plugin::class] = plugin
plugin.context = this
plugin.internalInstall(this, this.configuration)
if (plugin is WithUnsafeExtensionSuppression) {
plugin.extensionsSuppressed.forEach {
suppressedExtensions.listFor(it) += Suppression.ByPlugin(plugin)
}
}
}
override fun installExtension(extension: Extension<*, *, *>) {
rawExtensions += extension
if (extension.ordering is OrderingKind.ByDsl) {
val orderDsl = OrderDsl()
orderDsl.(extension.ordering.block)()
rawAdjacencyList.listFor(extension) += orderDsl.following.toList()
orderDsl.previous.forEach { rawAdjacencyList.listFor(it) += extension }
}
if (extension.override is OverrideKind.Present) {
fun root(ext: Extension<*, *, *>): List<Extension<*, *, *>> = if (ext.override is OverrideKind.Present) ext.override.overriden.flatMap(::root) else listOf(ext)
if (extension.override.overriden.size > 1 && root(extension).distinct().size > 1)
throw IllegalStateException("Extension $extension overrides extensions without common root")
extension.override.overriden.forEach { overriden ->
suppressedExtensions.listFor(overriden) += Suppression.ByExtension(extension)
}
}
}
fun logInitialisationInfo() {
val pluginNames = plugins.values.map { it::class.qualifiedName.toString() }
val loadedListForDebug = extensions.run { keys + values.flatten() }.toList()
.joinToString(prefix = "[\n", separator = ",\n", postfix = "\n]") { "\t$it" }
val suppressedList = suppressedExtensions.asSequence()
.joinToString(prefix = "[\n", separator = ",\n", postfix = "\n]") {
"\t${it.key} by " + (it.value.singleOrNull() ?: it.value)
}
logger.info("Loaded plugins: $pluginNames")
logger.info("Loaded: $loadedListForDebug")
logger.info("Suppressed: $suppressedList")
}
}
private fun checkClasspath(classLoader: URLClassLoader) {
classLoader.findResource(DokkaContext::class.java.name.replace('.', '/') + ".class")?.also {
throw AssertionError(
"Dokka API found on plugins classpath. This will lead to subtle bugs. " +
"Please fix your plugins dependencies or exclude dokka api artifact from plugin classpath"
)
}
}
private fun <K, V> MutableMap<K, MutableList<V>>.listFor(key: K) = getOrPut(key, ::mutableListOf)
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