Add initial version of Kotlin as Java plugin

1 files changed, 112 insertions, 0 deletions

diff --git a/plugins/kotlin-as-java/src/main/kotlin/JavaSignatureProvider.kt b/plugins/kotlin-as-java/src/main/kotlin/JavaSignatureProvider.kt
new file mode 100644
index 00000000..526546f2
--- /dev/null
+++ b/plugins/kotlin-as-java/src/main/kotlin/JavaSignatureProvider.kt
@@ -0,0 +1,112 @@
+package org.jetbrains.dokka.kotlinAsJava
+
+import org.jetbrains.dokka.base.signatures.SignatureProvider
+import org.jetbrains.dokka.base.transformers.pages.comments.CommentsToContentConverter
+import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder
+import org.jetbrains.dokka.links.DRI
+import org.jetbrains.dokka.links.sureClassNames
+import org.jetbrains.dokka.model.*
+import org.jetbrains.dokka.model.Annotation
+import org.jetbrains.dokka.model.Enum
+import org.jetbrains.dokka.model.Function
+import org.jetbrains.dokka.pages.ContentKind
+import org.jetbrains.dokka.pages.ContentNode
+import org.jetbrains.dokka.pages.PlatformData
+import org.jetbrains.dokka.utilities.DokkaLogger
+
+class JavaSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLogger) : SignatureProvider {
+    private val contentBuilder = PageContentBuilder(ctcc, logger)
+
+    override fun signature(documentable: Documentable): List<ContentNode> = when (documentable) {
+        is Function -> signature(documentable)
+        is Classlike -> signature(documentable)
+        else -> throw NotImplementedError(
+            "Cannot generate signature for ${documentable::class.qualifiedName} ${documentable.name}"
+        )
+    }
+
+    private fun signature(f: Function) = f.platformData.map { signature(f, it) }.distinct()
+
+    private fun signature(c: Classlike) = c.platformData.map { signature(c, it) }.distinct()
+
+    private fun signature(c: Classlike, platform: PlatformData) = contentBuilder.contentFor(c, ContentKind.Symbol) {
+        text(c.visibility[platform]?.externalDisplayName ?: "")
+        if (c is Class) {
+            text(c.modifier.toString())
+        }
+        when (c) {
+            is Class -> text(" class ")
+            is Interface -> text(" interface ")
+            is Enum -> text(" enum ")
+            is Object -> text(" class ")
+            is Annotation -> text(" @interface ")
+        }
+        text(c.name!!)
+        if (c is WithSupertypes) {
+            list(c.supertypes.getValue(platform), prefix = " : ") {
+                link(it.sureClassNames, it)
+            }
+        }
+    }
+
+    private fun signature(f: Function, platform: PlatformData) = contentBuilder.contentFor(f, ContentKind.Symbol) {
+        text(f.visibility[platform]?.externalDisplayName ?: "")
+        text(f.modifier.toString())
+        val returnType = f.type
+        if (!f.isConstructor && returnType.constructorFqName != Unit::class.qualifiedName) {
+            text(": ")
+            type(returnType)
+        }
+        text("  ")
+        link(f.name, f.dri)
+        val generics = f.generics.filterOnPlatform(platform)
+        if (generics.isNotEmpty()) {
+            text("<")
+            generics.forEach {
+                signature(it)
+            }
+            text(">")
+        }
+        text("(")
+        list(listOfNotNull(f.receiver) + f.parameters.filterOnPlatform(platform)) {
+            type(it.type)
+            text(" ")
+            link(it.name!!, it.dri)
+            text(", ")
+        }
+        text(")")
+    }
+
+    private fun signature(t: TypeParameter) = contentBuilder.contentFor(t, ContentKind.Symbol) {
+        link(t.name, t.dri)
+        if (t.bounds.isNotEmpty()) {
+            text("<")
+            t.bounds.forEach {
+                signature(it, t.dri, t.platformData)
+            }
+            text(">")
+        }
+    }
+
+    private fun signature(p: Projection, dri: DRI, platforms: List<PlatformData>): List<ContentNode> = when (p) {
+        is OtherParameter -> contentBuilder.contentFor(dri, platforms.toSet()) { text(p.name) }.children
+
+        is TypeConstructor -> contentBuilder.contentFor(dri, platforms.toSet()) {
+            link(p.dri.classNames.orEmpty(), p.dri)
+        }.children + p.projections.flatMap { signature(it, dri, platforms) }
+
+        is Variance -> contentBuilder.contentFor(dri, platforms.toSet()) {
+            text(p.kind.toString() + " ")
+        }.children + signature(p.inner, dri, platforms)
+
+        is Star -> contentBuilder.contentFor(dri, platforms.toSet()) { text("*") }.children
+
+        is Nullable -> signature(p.inner, dri, platforms) + contentBuilder.contentFor(
+            dri,
+            platforms.toSet()
+        ) { text("?") }.children
+    }
+
+    private fun <T : Documentable> Collection<T>.filterOnPlatform(platformData: PlatformData) =
+        this.filter { it.platformData.contains(platformData) }
+}
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