Support KaDestructuringDeclarationSymbol

(cherry picked from commit 335a998)

Author: ting-yuan

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/impl/symbol/kotlin/KSFunctionDeclarationImpl.kt

@@ -158,9 +158,14 @@ class KSFunctionDeclarationImpl private constructor(internal val ktFunctionSymbo
         if (!psi.hasBlockBody()) {
             emptySequence()
         } else {
-            psi.bodyBlockExpression?.statements?.asSequence()?.filterIsInstance<KtDeclaration>()?.mapNotNull {
+            psi.bodyBlockExpression?.statements?.asSequence()?.filterIsInstance<KtDeclaration>()?.flatMap {
                 analyze {
-                    it.symbol.toKSDeclaration()
+                    when (val symbol = it.symbol) {
+                        is KaDestructuringDeclarationSymbol -> {
+                            symbol.entries.mapNotNull { it.toKSDeclaration() }
+                        }
+                        else -> listOfNotNull(symbol.toKSDeclaration())
+                    }
                 }
             } ?: emptySequence()
         }

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/impl/symbol/kotlin/util.kt

@@ -381,6 +381,7 @@ internal fun KaSymbol.getContainingKSSymbol(): KSDeclaration? {
 
 internal fun KaSymbol.toKSDeclaration(): KSDeclaration? = this.toKSNode() as? KSDeclaration
 
+// For efficiency & simplicity, KaDestructuringDeclarationSymbol is handled by caller.
 internal fun KaSymbol.toKSNode(): KSNode {
     return when (this) {
         is KaPropertySymbol -> KSPropertyDeclarationImpl.getCached(this)

kotlin-analysis-api/testData/getSymbolsFromAnnotation.kt

@@ -38,6 +38,7 @@
 // functionFoo:KSFunctionDeclaration
 // p1:KSValueParameter
 // local:KSPropertyDeclaration
+// a:KSPropertyDeclaration
 // <init>:KSFunctionDeclaration
 // constructorParameterFoo:KSValueParameter
 // param:KSValueParameter
@@ -77,6 +78,7 @@
 // functionFoo:KSFunctionDeclaration
 // p1:KSValueParameter
 // local:KSPropertyDeclaration
+// a:KSPropertyDeclaration
 // <init>:KSFunctionDeclaration
 // constructorParameterFoo:KSValueParameter
 // param:KSValueParameter
@@ -106,6 +108,7 @@
 // functionFoo:KSFunctionDeclaration
 // p1:KSValueParameter
 // local:KSPropertyDeclaration
+// a:KSPropertyDeclaration
 // <init>:KSFunctionDeclaration
 // constructorParameterFoo:KSValueParameter
 // param:KSValueParameter
@@ -147,6 +150,7 @@ class Foo @Anno constructor(@Anno @param:Cnno val constructorParameterFoo: Int,
     @Anno
     fun functionFoo(@Anno p1: Int, @Bnno p2: Int) {
         @Anno val local = 1
+        val (@Anno a, b) = Pair<Int, Int>(17, 42)
     }
 
     @setparam:Cnno