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package org.jetbrains.dokka
import com.intellij.psi.*
import com.intellij.psi.javadoc.PsiDocTag
import com.intellij.psi.javadoc.PsiDocTagValue
import com.intellij.psi.javadoc.PsiDocToken
import com.intellij.psi.javadoc.PsiInlineDocTag
import org.jsoup.Jsoup
import org.jsoup.nodes.Element
import org.jsoup.nodes.Node
import org.jsoup.nodes.TextNode
data class JavadocParseResult(val content: Content, val deprecatedContent: Content?) {
companion object {
val Empty = JavadocParseResult(Content.Empty, null)
}
}
interface JavaDocumentationParser {
fun parseDocumentation(element: PsiNamedElement): JavadocParseResult
}
class JavadocParser(private val refGraph: NodeReferenceGraph) : JavaDocumentationParser {
override fun parseDocumentation(element: PsiNamedElement): JavadocParseResult {
val docComment = (element as? PsiDocCommentOwner)?.docComment
if (docComment == null) return JavadocParseResult.Empty
val result = MutableContent()
var deprecatedContent: Content? = null
val para = ContentParagraph()
result.append(para)
para.convertJavadocElements(docComment.descriptionElements.dropWhile { it.text.trim().isEmpty() })
docComment.tags.forEach { tag ->
when(tag.name) {
"see" -> result.convertSeeTag(tag)
"deprecated" -> {
deprecatedContent = Content()
deprecatedContent!!.convertJavadocElements(tag.contentElements())
}
else -> {
val subjectName = tag.getSubjectName()
val section = result.addSection(javadocSectionDisplayName(tag.name), subjectName)
section.convertJavadocElements(tag.contentElements())
}
}
}
return JavadocParseResult(result, deprecatedContent)
}
private fun PsiDocTag.contentElements(): Iterable<PsiElement> {
val tagValueElements = children
.dropWhile { it.node?.elementType == JavaDocTokenType.DOC_TAG_NAME }
.dropWhile { it is PsiWhiteSpace }
.filterNot { it.node?.elementType == JavaDocTokenType.DOC_COMMENT_LEADING_ASTERISKS }
return if (getSubjectName() != null) tagValueElements.dropWhile { it is PsiDocTagValue } else tagValueElements
}
private fun ContentBlock.convertJavadocElements(elements: Iterable<PsiElement>) {
val htmlBuilder = StringBuilder()
elements.forEach {
if (it is PsiInlineDocTag) {
htmlBuilder.append(convertInlineDocTag(it))
} else {
htmlBuilder.append(it.text)
}
}
val doc = Jsoup.parse(htmlBuilder.toString().trimStart())
doc.body().childNodes().forEach {
convertHtmlNode(it)
}
}
private fun ContentBlock.convertHtmlNode(node: Node) {
if (node is TextNode) {
append(ContentText(node.text()))
} else if (node is Element) {
val childBlock = createBlock(node)
node.childNodes().forEach {
childBlock.convertHtmlNode(it)
}
append(childBlock)
}
}
private fun createBlock(element: Element): ContentBlock = when(element.tagName()) {
"p" -> ContentParagraph()
"b", "strong" -> ContentStrong()
"i", "em" -> ContentEmphasis()
"s", "del" -> ContentStrikethrough()
"code" -> ContentCode()
"pre" -> ContentBlockCode()
"ul" -> ContentUnorderedList()
"ol" -> ContentOrderedList()
"li" -> ContentListItem()
"a" -> createLink(element)
else -> ContentBlock()
}
private fun createLink(element: Element): ContentBlock {
val docref = element.attr("docref")
if (docref != null) {
return ContentNodeLazyLink(docref, { -> refGraph.lookup(docref)})
}
val href = element.attr("href")
if (href != null) {
return ContentExternalLink(href)
} else {
return ContentBlock()
}
}
private fun MutableContent.convertSeeTag(tag: PsiDocTag) {
val linkElement = tag.linkElement()
if (linkElement == null) {
return
}
val seeSection = findSectionByTag(ContentTags.SeeAlso) ?: addSection(ContentTags.SeeAlso, null)
val linkSignature = resolveLink(linkElement)
val text = ContentText(linkElement.text)
if (linkSignature != null) {
val linkNode = ContentNodeLazyLink(tag.valueElement!!.text, { -> refGraph.lookup(linkSignature)})
linkNode.append(text)
seeSection.append(linkNode)
} else {
seeSection.append(text)
}
}
private fun convertInlineDocTag(tag: PsiInlineDocTag) = when (tag.name) {
"link", "linkplain" -> {
val valueElement = tag.linkElement()
val linkSignature = resolveLink(valueElement)
if (linkSignature != null) {
val labelText = tag.dataElements.firstOrNull { it is PsiDocToken }?.text ?: valueElement!!.text
val link = "<a docref=\"$linkSignature\">${labelText.htmlEscape()}</a>"
if (tag.name == "link") "<code>$link</code>" else link
}
else if (valueElement != null) {
valueElement.text
} else {
""
}
}
"code", "literal" -> {
val text = StringBuilder()
tag.dataElements.forEach { text.append(it.text) }
val escaped = text.toString().trimStart().htmlEscape()
if (tag.name == "code") "<code>$escaped</code>" else escaped
}
else -> tag.text
}
private fun PsiDocTag.linkElement(): PsiElement? =
valueElement ?: dataElements.firstOrNull { it !is PsiWhiteSpace }
private fun resolveLink(valueElement: PsiElement?): String? {
val target = valueElement?.reference?.resolve()
if (target != null) {
return getSignature(target)
}
return null
}
fun PsiDocTag.getSubjectName(): String? {
if (name == "param" || name == "throws" || name == "exception") {
return valueElement?.text
}
return null
}
}
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