[backport] Stabilize signatures to fix linking from Java to Kotlin

Basically there is 2 ways to get signature, from PSI and from
descriptors, and there should be only one way in one session

Original: adc09f2

2 files changed, 133 insertions, 1 deletions

diff --git a/core/src/main/kotlin/Analysis/AnalysisEnvironment.kt b/core/src/main/kotlin/Analysis/AnalysisEnvironment.kt
index b2e4b490..6854b323 100644
--- a/core/src/main/kotlin/Analysis/AnalysisEnvironment.kt
+++ b/core/src/main/kotlin/Analysis/AnalysisEnvironment.kt
@@ -29,6 +29,7 @@ import org.jetbrains.kotlin.cli.jvm.config.*
 import org.jetbrains.kotlin.cli.jvm.index.JavaRoot
 import org.jetbrains.kotlin.config.*
 import org.jetbrains.kotlin.container.getService
+import org.jetbrains.kotlin.container.tryGetService
 import org.jetbrains.kotlin.context.ProjectContext
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
@@ -250,7 +251,7 @@ class DokkaResolutionFacade(override val project: Project,
     }
 
     override fun <T : Any> tryGetFrontendService(element: PsiElement, serviceClass: Class<T>): T? {
-        return null
+        return resolverForModule.componentProvider.tryGetService(serviceClass)
     }
 
     override fun resolveToDescriptor(declaration: KtDeclaration, bodyResolveMode: BodyResolveMode): DeclarationDescriptor {
diff --git a/core/src/main/kotlin/Analysis/JavaResolveExtension.kt b/core/src/main/kotlin/Analysis/JavaResolveExtension.kt
new file mode 100644
index 00000000..f8992d45
--- /dev/null
+++ b/core/src/main/kotlin/Analysis/JavaResolveExtension.kt
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@file:JvmName("JavaResolutionUtils")
+
+package org.jetbrains.dokka
+
+import com.intellij.psi.*
+import org.jetbrains.kotlin.asJava.classes.KtLightClass
+import org.jetbrains.kotlin.asJava.unwrapped
+import org.jetbrains.kotlin.caches.resolve.KotlinCacheService
+import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
+import org.jetbrains.kotlin.incremental.components.NoLookupLocation
+import org.jetbrains.kotlin.load.java.sources.JavaSourceElement
+import org.jetbrains.kotlin.load.java.structure.*
+import org.jetbrains.kotlin.load.java.structure.impl.*
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.psi.KtClassOrObject
+import org.jetbrains.kotlin.psi.KtDeclaration
+import org.jetbrains.kotlin.psi.psiUtil.parameterIndex
+import org.jetbrains.kotlin.resolve.jvm.JavaDescriptorResolver
+import org.jetbrains.kotlin.resolve.jvm.platform.JvmPlatform
+import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
+import org.jetbrains.kotlin.resolve.scopes.MemberScope
+
+// TODO: Remove that file
+
+@JvmOverloads
+fun PsiMethod.getJavaMethodDescriptor(resolutionFacade: ResolutionFacade = javaResolutionFacade()): DeclarationDescriptor? {
+    val method = originalElement as? PsiMethod ?: return null
+    if (method.containingClass == null || !Name.isValidIdentifier(method.name)) return null
+    val resolver = method.getJavaDescriptorResolver(resolutionFacade)
+    return when {
+        method.isConstructor -> resolver?.resolveConstructor(JavaConstructorImpl(method))
+        else -> resolver?.resolveMethod(JavaMethodImpl(method))
+    }
+}
+
+@JvmOverloads
+fun PsiClass.getJavaClassDescriptor(resolutionFacade: ResolutionFacade = javaResolutionFacade()): ClassDescriptor? {
+    val psiClass = originalElement as? PsiClass ?: return null
+    return psiClass.getJavaDescriptorResolver(resolutionFacade)?.resolveClass(JavaClassImpl(psiClass))
+}
+
+@JvmOverloads
+fun PsiField.getJavaFieldDescriptor(resolutionFacade: ResolutionFacade = javaResolutionFacade()): PropertyDescriptor? {
+    val field = originalElement as? PsiField ?: return null
+    return field.getJavaDescriptorResolver(resolutionFacade)?.resolveField(JavaFieldImpl(field))
+}
+
+@JvmOverloads
+fun PsiMember.getJavaMemberDescriptor(resolutionFacade: ResolutionFacade = javaResolutionFacade()): DeclarationDescriptor? {
+    return when (this) {
+        is PsiEnumConstant -> containingClass?.getJavaClassDescriptor(resolutionFacade)
+        is PsiClass -> getJavaClassDescriptor(resolutionFacade)
+        is PsiMethod -> getJavaMethodDescriptor(resolutionFacade)
+        is PsiField -> getJavaFieldDescriptor(resolutionFacade)
+        else -> null
+    }
+}
+
+@JvmOverloads
+fun PsiMember.getJavaOrKotlinMemberDescriptor(resolutionFacade: ResolutionFacade = javaResolutionFacade()): DeclarationDescriptor? {
+    val callable = unwrapped
+    return when (callable) {
+        is PsiMember -> getJavaMemberDescriptor(resolutionFacade)
+        is KtDeclaration -> {
+            val descriptor = resolutionFacade.resolveToDescriptor(callable)
+            if (descriptor is ClassDescriptor && this is PsiMethod) descriptor.unsubstitutedPrimaryConstructor else descriptor
+        }
+        else -> null
+    }
+}
+
+private fun PsiElement.getJavaDescriptorResolver(resolutionFacade: ResolutionFacade): JavaDescriptorResolver? {
+    return resolutionFacade.tryGetFrontendService(this, JavaDescriptorResolver::class.java)
+}
+
+private fun JavaDescriptorResolver.resolveMethod(method: JavaMethod): DeclarationDescriptor? {
+    return getContainingScope(method)
+            ?.getContributedDescriptors(nameFilter = { true }, kindFilter = DescriptorKindFilter.CALLABLES)
+            ?.filterIsInstance<DeclarationDescriptorWithSource>()
+            ?.findByJavaElement(method)
+}
+
+private fun JavaDescriptorResolver.resolveConstructor(constructor: JavaConstructor): ConstructorDescriptor? {
+    return resolveClass(constructor.containingClass)?.constructors?.findByJavaElement(constructor)
+}
+
+private fun JavaDescriptorResolver.resolveField(field: JavaField): PropertyDescriptor? {
+    return getContainingScope(field)?.getContributedVariables(field.name, NoLookupLocation.FROM_IDE)?.findByJavaElement(field)
+}
+
+private fun JavaDescriptorResolver.getContainingScope(member: JavaMember): MemberScope? {
+    val containingClass = resolveClass(member.containingClass)
+    return if (member.isStatic)
+        containingClass?.staticScope
+    else
+        containingClass?.defaultType?.memberScope
+}
+
+private fun <T : DeclarationDescriptorWithSource> Collection<T>.findByJavaElement(javaElement: JavaElement): T? {
+    return firstOrNull { member ->
+        val memberJavaElement = (member.original.source as? JavaSourceElement)?.javaElement
+        when {
+            memberJavaElement == javaElement ->
+                true
+            memberJavaElement is JavaElementImpl<*> && javaElement is JavaElementImpl<*> ->
+                memberJavaElement.psi.isEquivalentTo(javaElement.psi)
+            else ->
+                false
+        }
+    }
+}
+
+fun PsiElement.javaResolutionFacade() =
+    KotlinCacheService.getInstance(project).getResolutionFacadeByFile(this.originalElement.containingFile, JvmPlatform)