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package org.jetbrains.dokka.commonmarkrenderer
import org.jetbrains.dokka.CoreExtensions
import org.jetbrains.dokka.pages.*
import org.jetbrains.dokka.plugability.DokkaContext
import org.jetbrains.dokka.plugability.DokkaPlugin
import java.lang.StringBuilder
class CommonmarkRendererPlugin : DokkaPlugin() {
val locationProviderFactory by extensionPoint<LocationProviderFactory>()
val outputWriter by extensionPoint<OutputWriter>()
val renderer by extending {
CoreExtensions.renderer providing { CommonmarkRenderer(it.single(outputWriter), it) }
}
val locationProvider by extending {
locationProviderFactory providing { MarkdownLocationProviderFactory(it) } order {
before(renderer)
}
}
}
class CommonmarkRenderer(
outputWriter: OutputWriter,
context: DokkaContext
) : DefaultRenderer<StringBuilder>(outputWriter, context) {
override fun StringBuilder.buildHeader(level: Int, content: StringBuilder.() -> Unit) {
buildParagraph()
append("#".repeat(level) + " ")
content()
buildNewLine()
}
override fun StringBuilder.buildLink(address: String, content: StringBuilder.() -> Unit) {
append("[")
content()
append("]($address)")
}
override fun StringBuilder.buildList(node: ContentList, pageContext: ContentPage, platformRestriction: PlatformData?) {
buildParagraph()
buildListLevel(node, pageContext)
buildParagraph()
}
private val indent = " ".repeat(4)
private fun StringBuilder.buildListItem(items: List<ContentNode>, pageContext: ContentPage, bullet: String = "*") {
items.forEach {
if (it is ContentList) {
val builder = StringBuilder()
builder.append(indent)
builder.buildListLevel(it, pageContext)
append(builder.toString().replace(Regex(" \n(?!$)"), " \n$indent"))
} else {
append("$bullet ")
it.build(this, pageContext)
buildNewLine()
}
}
}
private fun StringBuilder.buildListLevel(node: ContentList, pageContext: ContentPage) {
if (node.ordered) {
buildListItem(
node.children,
pageContext,
"${node.extra.allOfType<SimpleAttr>().find { it.extraKey == "start" }?.extraValue
?: 1.also { context.logger.error("No starting number specified for ordered list in node ${pageContext.dri.first()}!")}}."
)
} else {
buildListItem(node.children, pageContext, "*")
}
}
override fun StringBuilder.buildNewLine() {
append(" \n")
}
private fun StringBuilder.buildParagraph() {
append("\n\n")
}
override fun StringBuilder.buildResource(node: ContentEmbeddedResource, pageContext: ContentPage) {
append("Resource")
}
override fun StringBuilder.buildTable(node: ContentTable, pageContext: ContentPage, platformRestriction: PlatformData?) {
val size = node.children.firstOrNull()?.children?.size ?: 0
buildParagraph()
if (node.header.size > 0) {
node.header.forEach {
it.children.forEach {
append("| ")
it.build(this, pageContext)
}
append("|\n")
}
} else {
append("| ".repeat(size))
if (size > 0) append("|\n")
}
append("|---".repeat(size))
if (size > 0) append("|\n")
node.children.forEach {
it.children.forEach {
append("| ")
it.build(this, pageContext)
}
append("|\n")
}
}
override fun StringBuilder.buildText(textNode: ContentText) {
val decorators = decorators(textNode.style)
append(decorators)
append(textNode.text.escapeIllegalCharacters())
append(decorators.reversed())
}
override fun StringBuilder.buildNavigation(page: PageNode) {
locationProvider.ancestors(page).asReversed().forEach { node ->
append("/")
if (node.isNavigable) buildLink(node, page)
else append(node.name)
}
buildParagraph()
}
override fun buildPage(page: ContentPage, content: (StringBuilder, ContentPage) -> Unit): String =
StringBuilder().apply {
content(this, page)
}.toString()
override fun buildError(node: ContentNode) {
context.logger.warn("Markdown renderer has encountered problem. The unmatched node is $node")
}
private fun decorators(styles: Set<Style>) = StringBuilder().apply {
styles.forEach {
when (it) {
TextStyle.Bold -> append("**")
TextStyle.Italic -> append("*")
TextStyle.Strong -> append("**")
TextStyle.Strikethrough -> append("~~")
else -> Unit
}
}
}.toString()
private val PageNode.isNavigable: Boolean
get() = this !is RendererSpecificPage || strategy != RenderingStrategy.DoNothing
private fun StringBuilder.buildLink(to: PageNode, from: PageNode) =
buildLink(locationProvider.resolve(to, from)) {
append(to.name)
}
override fun renderPage(page: PageNode) {
val path by lazy { locationProvider.resolve(page, skipExtension = true) }
when (page) {
is ContentPage -> outputWriter.write(path, buildPage(page) { c, p -> buildPageContent(c, p) }, ".md")
is RendererSpecificPage -> when (val strategy = page.strategy) {
is RenderingStrategy.Copy -> outputWriter.writeResources(strategy.from, path)
is RenderingStrategy.Write -> outputWriter.write(path, strategy.text, "")
is RenderingStrategy.Callback -> outputWriter.write(path, strategy.instructions(this, page), ".md")
RenderingStrategy.DoNothing -> Unit
}
else -> throw AssertionError(
"Page ${page.name} cannot be rendered by renderer as it is not renderer specific nor contains content"
)
}
}
}
class MarkdownLocationProviderFactory(val context: DokkaContext) : LocationProviderFactory {
override fun getLocationProvider(pageNode: RootPageNode) = MarkdownLocationProvider(pageNode, context)
}
class MarkdownLocationProvider(
pageGraphRoot: RootPageNode,
dokkaContext: DokkaContext
) : DefaultLocationProvider(
pageGraphRoot,
dokkaContext
) {
override val extension = ".md"
}
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