Enhance generated primary constructor signature for html format (#2313)

Fixes #1880 

3 files changed, 54 insertions, 3 deletions

diff --git a/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt b/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
index 3f8c1703..8d97701d 100644
--- a/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
+++ b/plugins/base/src/main/kotlin/signatures/KotlinSignatureProvider.kt
@@ -2,12 +2,12 @@ package org.jetbrains.dokka.base.signatures
 
 import org.jetbrains.dokka.DokkaConfiguration.DokkaSourceSet
 import org.jetbrains.dokka.Platform
+import org.jetbrains.dokka.analysis.DescriptorDocumentableSource
 import org.jetbrains.dokka.base.DokkaBase
 import org.jetbrains.dokka.base.signatures.KotlinSignatureUtils.dri
 import org.jetbrains.dokka.base.signatures.KotlinSignatureUtils.driOrNull
 import org.jetbrains.dokka.base.transformers.pages.comments.CommentsToContentConverter
 import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder
-import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder.DocumentableContentBuilder
 import org.jetbrains.dokka.links.*
 import org.jetbrains.dokka.model.*
 import org.jetbrains.dokka.model.Nullable
@@ -18,6 +18,8 @@ import org.jetbrains.dokka.plugability.DokkaContext
 import org.jetbrains.dokka.plugability.plugin
 import org.jetbrains.dokka.plugability.querySingle
 import org.jetbrains.dokka.utilities.DokkaLogger
+import org.jetbrains.kotlin.js.resolve.diagnostics.findPsi
+import org.jetbrains.kotlin.psi.KtParameter
 import kotlin.text.Typography.nbsp
 
 class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLogger)
@@ -182,12 +184,23 @@ class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLog
                     // should be present only if it has parameters. If there are
                     // no parameters, it should result in `class Example`
                     if (pConstructor.parameters.isNotEmpty()) {
+                        val parameterPropertiesByName = c.properties
+                            .filter { it.isAlsoParameter(sourceSet) }
+                            .associateBy { it.name }
+
                         punctuation("(")
                         parametersBlock(pConstructor) { param ->
                             annotationsInline(param)
+                            parameterPropertiesByName[param.name]?.let { property ->
+                                property.setter?.let { keyword("var ") } ?: keyword("val ")
+                            }
                             text(param.name.orEmpty())
                             operator(": ")
                             signatureForProjection(param.type)
+                            param.extra[DefaultValue]?.let {
+                                operator(" = ")
+                                highlightValue(it.value)
+                            }
                         }
                         punctuation(")")
                     }
@@ -207,6 +220,13 @@ class KotlinSignatureProvider(ctcc: CommentsToContentConverter, logger: DokkaLog
             }
         }
 
+    /**
+     * An example would be a primary constructor `class A(val s: String)`,
+     * where `s` is both a function parameter and a property
+     */
+    private fun DProperty.isAlsoParameter(sourceSet: DokkaSourceSet) =
+        (this.sources[sourceSet] as? DescriptorDocumentableSource)?.descriptor?.findPsi() is KtParameter
+
     private fun propertySignature(p: DProperty) =
         p.sourceSets.map {
             contentBuilder.contentFor(
diff --git a/plugins/base/src/test/kotlin/content/signatures/SkippingParenthesisForConstructorsTest.kt b/plugins/base/src/test/kotlin/content/signatures/SkippingParenthesisForConstructorsTest.kt
index 508a0a36..b6fc4e6b 100644
--- a/plugins/base/src/test/kotlin/content/signatures/SkippingParenthesisForConstructorsTest.kt
+++ b/plugins/base/src/test/kotlin/content/signatures/SkippingParenthesisForConstructorsTest.kt
@@ -122,7 +122,7 @@ class ConstructorsSignaturesTest : BaseAbstractTest() {
             |/src/main/kotlin/test/source.kt
             |package test
             |
-            |class SomeClass(val a: String)
+            |class SomeClass(val a: String, var i: Int)
             |
         """.trimIndent(), testConfiguration
         ) {
@@ -139,8 +139,13 @@ class ConstructorsSignaturesTest : BaseAbstractTest() {
                                 +"("
                                 group {
                                     group {
-                                        +"a: " // TODO: Make sure if we still do not want to have "val" here
+                                        +"val a: "
                                         group { link { +"String" } }
+                                        +", "
+                                    }
+                                    group {
+                                        +"var i: "
+                                        group { link { +"Int" } }
                                     }
                                 }
                                 +")"
diff --git a/plugins/base/src/test/kotlin/signatures/SignatureTest.kt b/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
index 7ab0f663..ddf1c892 100644
--- a/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
+++ b/plugins/base/src/test/kotlin/signatures/SignatureTest.kt
@@ -745,6 +745,32 @@ class SignatureTest : BaseAbstractTest() {
     }
 
     @Test
+    fun `primary constructor with properties check for all tokens`() {
+        val writerPlugin = TestOutputWriterPlugin()
+
+        testInline(
+            """
+                |/src/main/kotlin/common/Test.kt
+                |package example
+                |
+                |class PrimaryConstructorClass<T>(val x: Int, var s: String) { }
+            """.trimMargin(),
+            configuration,
+            pluginOverrides = listOf(writerPlugin)
+        ) {
+            renderingStage = { _, _ ->
+                writerPlugin.writer.renderedContent("root/example/-primary-constructor-class/index.html").firstSignature().match(
+                    // In `<T>` expression, an empty `<span class="token keyword"></span>` is present for some reason
+                    Span("class "), A("PrimaryConstructorClass"), Span("<"), Span(), A("T"), Span(">"), Span("("), Parameters(
+                        Parameter(Span("val "), "x", Span(": "), A("Int"), Span(",")),
+                        Parameter(Span("var "), "s", Span(": "), A("String"))
+                    ), Span(")"), Span(),
+                )
+            }
+        }
+    }
+
+    @Test
     fun `fun with default values`() {
         val source = source("fun simpleFun(int: Int = 1, string: String = \"string\"): String = \"\"")
         val writerPlugin = TestOutputWriterPlugin()