5 files changed, 50 insertions, 5 deletions

diff --git a/core/src/main/kotlin/CoreExtensions.kt b/core/src/main/kotlin/CoreExtensions.kt
index be354bc4..d7b0b285 100644
--- a/core/src/main/kotlin/CoreExtensions.kt
+++ b/core/src/main/kotlin/CoreExtensions.kt
@@ -6,6 +6,7 @@ import org.jetbrains.dokka.transformers.descriptors.DescriptorToDocumentableTran
 import org.jetbrains.dokka.transformers.documentation.DocumentableMerger
 import org.jetbrains.dokka.transformers.documentation.DocumentableToPageTranslator
 import org.jetbrains.dokka.transformers.documentation.DocumentableTransformer
+import org.jetbrains.dokka.transformers.documentation.PreMergeDocumentableTransformer
 import org.jetbrains.dokka.transformers.pages.PageTransformer
 import org.jetbrains.dokka.transformers.psi.PsiToDocumentableTranslator
 import kotlin.reflect.KProperty
@@ -13,6 +14,7 @@ import kotlin.reflect.KProperty
 object CoreExtensions {
     val descriptorToDocumentableTranslator by coreExtension<DescriptorToDocumentableTranslator>()
     val psiToDocumentableTranslator by coreExtension<PsiToDocumentableTranslator>()
+    val preMergeDocumentableTransformer by coreExtension<PreMergeDocumentableTransformer>()
     val documentableMerger by coreExtension<DocumentableMerger>()
     val documentableTransformer by coreExtension<DocumentableTransformer>()
     val documentableToPageTranslator by coreExtension<DocumentableToPageTranslator>()
diff --git a/core/src/main/kotlin/DokkaGenerator.kt b/core/src/main/kotlin/DokkaGenerator.kt
index a260d5ad..d598c773 100644
--- a/core/src/main/kotlin/DokkaGenerator.kt
+++ b/core/src/main/kotlin/DokkaGenerator.kt
@@ -39,11 +39,14 @@ class DokkaGenerator(
         report("Creating documentation models")
         val modulesFromPlatforms = createDocumentationModels(platforms, context)
 
+        report("Transforming documentation model before merging")
+        val transformedDocumentationBeforeMerge = transformDocumentationModelBeforeMerge(modulesFromPlatforms, context)
+
         report("Merging documentation models")
-        val documentationModel = mergeDocumentationModels(modulesFromPlatforms, context)
+        val documentationModel = mergeDocumentationModels(transformedDocumentationBeforeMerge, context)
 
-        report("Transforming documentation model")
-        val transformedDocumentation = transformDocumentationModel(documentationModel, context)
+        report("Transforming documentation model after merging")
+        val transformedDocumentation = transformDocumentationModelAfterMerge(documentationModel, context)
 
         report("Creating pages")
         val pages = createPages(transformedDocumentation, context)
@@ -61,7 +64,7 @@ class DokkaGenerator(
 
     fun setUpAnalysis(configuration: DokkaConfiguration): Map<PlatformData, EnvironmentAndFacade> =
         configuration.passesConfigurations.map {
-            PlatformData(it.moduleName, it.analysisPlatform, it.targets) to createEnvironmentAndFacade(it)
+            it.platformData to createEnvironmentAndFacade(it)
         }.toMap()
 
     fun initializePlugins(
@@ -77,12 +80,17 @@ class DokkaGenerator(
     ) = platforms.map { (pdata, _) -> translateDescriptors(pdata, context) } +
             platforms.map { (pdata, _) -> translatePsi(pdata, context) }
 
+    fun transformDocumentationModelBeforeMerge(
+        modulesFromPlatforms: List<DModule>,
+        context: DokkaContext
+    ) = context[CoreExtensions.preMergeDocumentableTransformer].fold(modulesFromPlatforms) { acc, t -> t(acc, context) }
+
     fun mergeDocumentationModels(
         modulesFromPlatforms: List<DModule>,
         context: DokkaContext
     ) = context.single(CoreExtensions.documentableMerger).invoke(modulesFromPlatforms, context)
 
-    fun transformDocumentationModel(
+    fun transformDocumentationModelAfterMerge(
         documentationModel: DModule,
         context: DokkaContext
     ) = context[CoreExtensions.documentableTransformer].fold(documentationModel) { acc, t -> t(acc, context) }
diff --git a/core/src/main/kotlin/configuration.kt b/core/src/main/kotlin/configuration.kt
index 8c6d35e8..4a6b7d68 100644
--- a/core/src/main/kotlin/configuration.kt
+++ b/core/src/main/kotlin/configuration.kt
@@ -1,5 +1,6 @@
 package org.jetbrains.dokka
 
+import org.jetbrains.dokka.pages.PlatformData
 import java.io.File
 import java.net.URL
 
@@ -57,6 +58,9 @@ interface DokkaConfiguration {
         val analysisPlatform: Platform
         val targets: List<String>
         val sinceKotlin: String?
+
+        val platformData: PlatformData
+        get() = PlatformData(moduleName, analysisPlatform, targets)
     }
 
     interface SourceRoot {
diff --git a/core/src/main/kotlin/model/documentableUtils.kt b/core/src/main/kotlin/model/documentableUtils.kt
new file mode 100644
index 00000000..7f946344
--- /dev/null
+++ b/core/src/main/kotlin/model/documentableUtils.kt
@@ -0,0 +1,23 @@
+package org.jetbrains.dokka.model
+
+import org.jetbrains.dokka.pages.PlatformData
+
+fun <T> PlatformDependent<T>.filtered(platformDataList: List<PlatformData>) = PlatformDependent(
+    map.filter { it.key in platformDataList },
+    expect
+)
+
+fun DTypeParameter.filter(filteredData: List<PlatformData>) =
+    if (filteredData.containsAll(platformData)) this
+    else {
+        val intersection = filteredData.intersect(platformData).toList()
+        if (intersection.isEmpty()) null
+        else DTypeParameter(
+            dri,
+            name,
+            documentation.filtered(intersection),
+            bounds,
+            intersection,
+            extra
+        )
+    }
\ No newline at end of file
diff --git a/core/src/main/kotlin/transformers/documentation/PreMergeDocumentableTransformer.kt b/core/src/main/kotlin/transformers/documentation/PreMergeDocumentableTransformer.kt
new file mode 100644
index 00000000..dfb1f26b
--- /dev/null
+++ b/core/src/main/kotlin/transformers/documentation/PreMergeDocumentableTransformer.kt
@@ -0,0 +1,8 @@
+package org.jetbrains.dokka.transformers.documentation
+
+import org.jetbrains.dokka.model.DModule
+import org.jetbrains.dokka.plugability.DokkaContext
+
+interface PreMergeDocumentableTransformer {
+    operator fun invoke(modules: List<DModule>, context: DokkaContext): List<DModule>
+}
\ No newline at end of file