Fix constructor tag does not work (#417)

 #300 Fixed

3 files changed, 36 insertions, 5 deletions

diff --git a/core/src/main/kotlin/Kotlin/DescriptorDocumentationParser.kt b/core/src/main/kotlin/Kotlin/DescriptorDocumentationParser.kt
index 7817da18..d1f98184 100644
--- a/core/src/main/kotlin/Kotlin/DescriptorDocumentationParser.kt
+++ b/core/src/main/kotlin/Kotlin/DescriptorDocumentationParser.kt
@@ -19,6 +19,8 @@ import org.jetbrains.kotlin.load.java.descriptors.JavaCallableMemberDescriptor
 import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.psi.KtDeclaration
+import org.jetbrains.kotlin.psi.KtElement
+import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.annotations.argumentValue
 import org.jetbrains.kotlin.resolve.constants.StringValue
@@ -38,10 +40,10 @@ class DescriptorDocumentationParser
         val externalDocumentationLinkResolver: ExternalDocumentationLinkResolver
 )
 {
-    fun parseDocumentation(descriptor: DeclarationDescriptor, inline: Boolean = false): Content =
-            parseDocumentationAndDetails(descriptor, inline).first
+    fun parseDocumentation(descriptor: DeclarationDescriptor, inline: Boolean = false, isDefaultNoArgConstructor: Boolean = false): Content =
+            parseDocumentationAndDetails(descriptor, inline, isDefaultNoArgConstructor).first
 
-    fun parseDocumentationAndDetails(descriptor: DeclarationDescriptor, inline: Boolean = false): Pair<Content, (DocumentationNode) -> Unit> {
+    fun parseDocumentationAndDetails(descriptor: DeclarationDescriptor, inline: Boolean = false, isDefaultNoArgConstructor: Boolean = false): Pair<Content, (DocumentationNode) -> Unit> {
         if (descriptor is JavaClassDescriptor || descriptor is JavaCallableMemberDescriptor) {
             return parseJavadoc(descriptor)
         }
@@ -62,7 +64,10 @@ class DescriptorDocumentationParser
                 ?.resolveToDescriptorIfAny()
                 ?: descriptor
 
-        var kdocText = kdoc.getContent()
+        var kdocText = if (isDefaultNoArgConstructor) {
+            getConstructorTagContent(descriptor) ?: kdoc.getContent()
+        } else kdoc.getContent()
+
         // workaround for code fence parsing problem in IJ markdown parser
         if (kdocText.endsWith("```") || kdocText.endsWith("~~~")) {
             kdocText += "\n"
@@ -90,6 +95,13 @@ class DescriptorDocumentationParser
         return content to { node -> }
     }
 
+    private fun getConstructorTagContent(descriptor: DeclarationDescriptor): String? {
+        return ((DescriptorToSourceUtils.descriptorToDeclaration(descriptor)?.navigationElement as? KtElement) as KtDeclaration).docComment?.findSectionByTag(
+            KDocKnownTag.CONSTRUCTOR
+        )?.getContent()
+    }
+
+
     private fun DeclarationDescriptor.isSuppressWarning() : Boolean {
         val suppressAnnotation = annotations.findAnnotation(FqName(Suppress::class.qualifiedName!!))
         return if (suppressAnnotation != null) {
diff --git a/core/src/main/kotlin/Kotlin/KotlinAsJavaDocumentationBuilder.kt b/core/src/main/kotlin/Kotlin/KotlinAsJavaDocumentationBuilder.kt
index c7ed8292..00a795d0 100644
--- a/core/src/main/kotlin/Kotlin/KotlinAsJavaDocumentationBuilder.kt
+++ b/core/src/main/kotlin/Kotlin/KotlinAsJavaDocumentationBuilder.kt
@@ -6,9 +6,11 @@ import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiNamedElement
 import org.jetbrains.dokka.Kotlin.DescriptorDocumentationParser
 import org.jetbrains.kotlin.asJava.elements.KtLightElement
+import org.jetbrains.kotlin.asJava.elements.KtLightMethod
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.psi.KtClass
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.psi.KtParameter
 import org.jetbrains.kotlin.psi.KtPropertyAccessor
@@ -59,8 +61,9 @@ class KotlinAsJavaDocumentationParser
                 return JavadocParseResult.Empty
             }
         }
+        val isDefaultNoArgConstructor = kotlinLightElement is KtLightMethod && origin is KtClass
         val descriptor = resolutionFacade.resolveToDescriptor(origin)
-        val content = descriptorDocumentationParser.parseDocumentation(descriptor, origin is KtParameter)
+        val content = descriptorDocumentationParser.parseDocumentation(descriptor, origin is KtParameter, isDefaultNoArgConstructor)
         return JavadocParseResult(content, null)
     }
 }
diff --git a/core/src/test/kotlin/javadoc/JavadocTest.kt b/core/src/test/kotlin/javadoc/JavadocTest.kt
index 04f8b920..3e5b5ff8 100644
--- a/core/src/test/kotlin/javadoc/JavadocTest.kt
+++ b/core/src/test/kotlin/javadoc/JavadocTest.kt
@@ -243,6 +243,22 @@ class JavadocTest {
         }
     }
 
+    @Test
+    fun testDefaultNoArgConstructor() {
+        verifyJavadoc("testdata/javadoc/defaultNoArgConstructor.kt") { doc ->
+            val classDoc = doc.classNamed("foo.Peach")!!
+            assertTrue(classDoc.constructors()[0].tags()[2].text() == "print peach")
+        }
+    }
+
+    @Test
+    fun testNoArgConstructor() {
+        verifyJavadoc("testdata/javadoc/noArgConstructor.kt") { doc ->
+            val classDoc = doc.classNamed("foo.Plum")!!
+            assertTrue(classDoc.constructors()[0].tags()[2].text() == "print plum")
+        }
+    }
+
     private fun verifyJavadoc(name: String,
                               withJdk: Boolean = false,
                               withKotlinRuntime: Boolean = false,