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package org.jetbrains.dokka.templates
import org.jetbrains.dokka.base.templating.Command
import org.jetbrains.dokka.base.templating.SubstitutionCommand
import org.jetbrains.dokka.plugability.DokkaContext
import org.jetbrains.dokka.plugability.plugin
import org.jetbrains.dokka.plugability.query
import org.jsoup.nodes.DataNode
import org.jsoup.nodes.Element
import org.jsoup.nodes.Node
import org.jsoup.nodes.TextNode
import java.io.File
class SubstitutionCommandHandler(context: DokkaContext) : CommandHandler {
override fun handleCommand(element: Element, command: Command, input: File, output: File) {
command as SubstitutionCommand
substitute(element, TemplatingContext(input, output, element, command))
}
override fun canHandle(command: Command): Boolean = command is SubstitutionCommand
private val substitutors = context.plugin<TemplatingPlugin>().query { substitutor }
private fun findSubstitution(commandContext: TemplatingContext<SubstitutionCommand>, match: MatchResult): String =
substitutors.asSequence().mapNotNull { it.trySubstitute(commandContext, match) }.firstOrNull() ?: match.value
private fun substitute(element: Element, commandContext: TemplatingContext<SubstitutionCommand>) {
val regex = commandContext.command.pattern.toRegex()
element.children().forEach { it.traverseToSubstitute(regex, commandContext) }
val childrenCopy = element.children().toList()
val position = element.elementSiblingIndex()
val parent = element.parent()
element.remove()
parent.insertChildren(position, childrenCopy)
}
private fun Node.traverseToSubstitute(regex: Regex, commandContext: TemplatingContext<SubstitutionCommand>) {
when (this) {
is TextNode -> replaceWith(TextNode(wholeText.substitute(regex, commandContext)))
is DataNode -> replaceWith(DataNode(wholeData.substitute(regex, commandContext)))
is Element -> {
attributes().forEach { attr(it.key, it.value.substitute(regex, commandContext)) }
childNodes().forEach { it.traverseToSubstitute(regex, commandContext) }
}
}
}
private fun String.substitute(regex: Regex, commandContext: TemplatingContext<SubstitutionCommand>) = buildString {
var lastOffset = 0
regex.findAll(this@substitute).forEach { match ->
append(this@substitute, lastOffset, match.range.first)
append(findSubstitution(commandContext, match))
lastOffset = match.range.last + 1
}
append(this@substitute, lastOffset, this@substitute.length)
}
}
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