1 files changed, 148 insertions, 0 deletions
diff --git a/src/Languages/JavaLanguageService.kt b/src/Languages/JavaLanguageService.kt
new file mode 100644
index 00000000..8cc185f4
--- /dev/null
+++ b/src/Languages/JavaLanguageService.kt
@@ -0,0 +1,148 @@
+package org.jetbrains.dokka
+
+import org.jetbrains.dokka.DocumentationNode.*
+
+class JavaLanguageService : LanguageService {
+    override fun render(node: DocumentationNode): String {
+        return when (node.kind) {
+            Kind.Package -> renderPackage(node)
+            Kind.Class,
+            Kind.Interface,
+            Kind.Enum,
+            Kind.EnumItem,
+            Kind.Object -> renderClass(node)
+
+            Kind.TypeParameter -> renderTypeParameter(node)
+            Kind.Type,
+            Kind.UpperBound -> renderType(node)
+
+            Kind.Constructor,
+            Kind.Function -> renderFunction(node)
+            Kind.Property -> renderProperty(node)
+            else -> "${node.kind}: ${node.name}"
+        }
+    }
+
+    override fun renderName(node: DocumentationNode): String {
+        return when (node.kind) {
+            Kind.Constructor -> node.owner!!.name
+            else -> node.name
+        }
+    }
+
+    override fun renderPackage(node: DocumentationNode): String {
+        return "package ${node.name}"
+    }
+
+    override fun renderModifier(node: DocumentationNode): String {
+        return when (node.name) {
+            "open" -> ""
+            "internal" -> ""
+            else -> node.name
+        }
+    }
+
+    override fun renderType(node: DocumentationNode): String {
+        return when (node.name) {
+            "Unit" -> "void"
+            "Int" -> "int"
+            "Long" -> "long"
+            "Double" -> "double"
+            "Float" -> "float"
+            "Char" -> "char"
+            "Boolean" -> "bool"
+        // TODO: render arrays
+            else -> node.name
+        }
+    }
+
+    override fun renderTypeParameter(node: DocumentationNode): String {
+        val constraints = node.details(Kind.UpperBound)
+        return if (constraints.none())
+            node.name
+        else {
+            node.name + " extends " + constraints.map { renderType(node) }.join()
+        }
+    }
+
+    override fun renderParameter(node: DocumentationNode): String {
+        return "${renderType(node.detail(Kind.Type))} ${node.name}"
+    }
+
+    override fun renderTypeParametersForNode(node: DocumentationNode): String {
+        return StringBuilder {
+            val typeParameters = node.details(Kind.TypeParameter)
+            if (typeParameters.any()) {
+                append("<")
+                append(typeParameters.map { renderTypeParameter(it) }.join())
+                append("> ")
+            }
+        }.toString()
+    }
+
+    override fun renderModifiersForNode(node: DocumentationNode): String {
+        val modifiers = node.details(Kind.Modifier).map { renderModifier(it) }.filter { it != "" }
+        if (modifiers.none())
+            return ""
+        return modifiers.join(" ", postfix = " ")
+    }
+
+    override fun renderClass(node: DocumentationNode): String {
+        return StringBuilder {
+            when (node.kind) {
+                Kind.Class -> append("class ")
+                Kind.Interface -> append("interface ")
+                Kind.Enum -> append("enum ")
+                Kind.EnumItem -> append("enum value ")
+                Kind.Object -> append("class ")
+                else -> throw IllegalArgumentException("Node $node is not a class-like object")
+            }
+
+            append(node.name)
+            append(renderTypeParametersForNode(node))
+        }.toString()
+    }
+
+    override fun renderFunction(node: DocumentationNode): String {
+        return StringBuilder {
+            when (node.kind) {
+                Kind.Constructor -> append(node.owner?.name)
+                Kind.Function -> {
+                    append(renderTypeParametersForNode(node))
+                    append(renderType(node.detail(Kind.Type)))
+                    append(" ")
+                    append(node.name)
+                }
+                else -> throw IllegalArgumentException("Node $node is not a function-like object")
+            }
+
+            val receiver = node.details(Kind.Receiver).firstOrNull() // TODO: replace with singleOrNull when fixed
+            append("(")
+            if (receiver != null)
+                append((listOf(receiver) + node.details(Kind.Parameter)).map { renderParameter(it) }.join())
+            else
+                append(node.details(Kind.Parameter).map { renderParameter(it) }.join())
+
+            append(")")
+        }.toString()
+    }
+
+    override fun renderProperty(node: DocumentationNode): String {
+        return StringBuilder {
+            when (node.kind) {
+                Kind.Property -> append("val ")
+                else -> throw IllegalArgumentException("Node $node is not a property")
+            }
+            append(renderTypeParametersForNode(node))
+            val receiver = node.details(Kind.Receiver).firstOrNull() // TODO: replace with singleOrNull when fixed
+            if (receiver != null) {
+                append(renderType(receiver.detail(Kind.Type)))
+                append(".")
+            }
+
+            append(node.name)
+            append(": ")
+            append(renderType(node.detail(Kind.Type)))
+        }.toString()
+    }
+}
+\ No newline at end of file