[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

1 files changed, 31 insertions, 0 deletions

diff --git a/core/src/main/kotlin/Kotlin/KotlinElementSignatureProvider.kt b/core/src/main/kotlin/Kotlin/KotlinElementSignatureProvider.kt
new file mode 100644
index 00000000..4f788634
--- /dev/null
+++ b/core/src/main/kotlin/Kotlin/KotlinElementSignatureProvider.kt
@@ -0,0 +1,31 @@
+package org.jetbrains.dokka
+
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiMember
+import com.intellij.psi.PsiNameIdentifierOwner
+import org.jetbrains.kotlin.asJava.elements.KtLightElement
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.resolve.BindingContext
+import javax.inject.Inject
+
+class KotlinElementSignatureProvider @Inject constructor(
+        val resolutionFacade: DokkaResolutionFacade
+) : ElementSignatureProvider {
+    override fun signature(forPsi: PsiElement): String {
+
+        val desc = when (forPsi) {
+            is KtLightElement<*, *> -> return signature(forPsi.kotlinOrigin!!)
+            is PsiMember -> forPsi.getJavaOrKotlinMemberDescriptor(resolutionFacade)
+            else -> resolutionFacade.resolveSession.bindingContext[BindingContext.DECLARATION_TO_DESCRIPTOR, forPsi]
+        }
+
+        if (desc == null && (forPsi as? PsiNameIdentifierOwner)?.name == "remove") {
+            (forPsi as? PsiMember)?.getJavaOrKotlinMemberDescriptor(resolutionFacade)
+        }
+
+        return desc?.let { signature(it) }
+                ?: run { "no desc for $forPsi in ${(forPsi as? PsiMember)?.containingClass}" }
+    }
+
+    override fun signature(forDesc: DeclarationDescriptor): String = forDesc.signature()
+}
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