[AA] provide psiType#asKtType conversion

it's useful for IDE's features such as write UAST or refactorings

^KT-62302 fixed

Merge-request: KT-MR-12414
Merged-by: Anna Kozlova <Anna.Kozlova@jetbrains.com>

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/components/KtPsiTypeProvider.kt

@@ -20,6 +20,11 @@ public abstract class KtPsiTypeProvider : KtAnalysisSessionComponent() {
         isAnnotationMethod: Boolean,
         allowErrorTypes: Boolean
     ): PsiTypeElement?
+
+    public abstract fun asKtType(
+        psiType: PsiType,
+        useSitePosition: PsiElement
+    ): KtType?
 }
 
 public interface KtPsiTypeProviderMixIn : KtAnalysisSessionMixIn {
@@ -68,4 +73,14 @@ public interface KtPsiTypeProviderMixIn : KtAnalysisSessionMixIn {
         isAnnotationMethod: Boolean = false
     ): PsiType? =
         asPsiTypeElement(useSitePosition, allowErrorTypes, mode, isAnnotationMethod)?.type
+
+    /**
+     * Converts given [PsiType] to [KtType].
+     *
+     * @receiver PsiType to be converted.
+     * @return The converted KtType, or null if conversion is not possible e.g., [PsiType] is not resolved
+     */
+    public fun PsiType.asKtType(useSitePosition: PsiElement): KtType? = withValidityAssertion {
+        analysisSession.psiTypeProvider.asKtType(this, useSitePosition)
+    }
 }

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/anonym.kt

@@ -0,0 +1,11 @@
+// FILE: B.kt
+class A<caret_onAirContext>K: A<String>() {
+}
+// FILE: A.java
+class A<T> {
+    A<T> a = new A<>() {
+        T f<caret>oo() {
+
+        }
+    }
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/anonym.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:T
+KtType: T?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/extends.kt

@@ -0,0 +1,8 @@
+// FILE: B.kt
+interface B: A {
+    fun f<caret_onAirContext>oo(): java.util.List<String?>?
+}
+// FILE: A.java
+public interface A {
+    java.util.List<? extends String> fo<caret>o();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/extends.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:List<? extends String>
+KtType: kotlin.collections.List<kotlin.String?>?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/methodTypeParameters.kt

@@ -0,0 +1,10 @@
+// FILE: B.kt
+class B: A<String> {
+    override fun <K : String?> f<caret_onAirContext>oo(): K? {
+        TODO("Not yet implemented")
+    }
+}
+// FILE: A.java
+public interface A<T> {
+    <K extends T> K fo<caret>o();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/methodTypeParameters.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:K
+KtType: K?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/nestedGenerics.kt

@@ -0,0 +1,8 @@
+// FILE: B.kt
+interface B: A {
+    fun fo<caret_onAirContext>o(): java.util.List<String?>?
+}
+// FILE: A.java
+public interface A {
+    java.util.List<String> fo<caret>o();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/nestedGenerics.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:List<String>
+KtType: kotlin.collections.List<kotlin.String?>?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/nullableString.kt

@@ -0,0 +1,8 @@
+// FILE: B.kt
+interface B: A {
+    fun f<caret_onAirContext>oo(): String?
+}
+// FILE: A.java
+public interface A {
+    String fo<caret>o();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/nullableString.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:String
+KtType: kotlin.String?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/primitive.kt

@@ -0,0 +1,8 @@
+// FILE: B.kt
+interface B: A {
+    fun fo<caret_onAirContext>o(): Int
+}
+// FILE: A.java
+public interface A {
+    int fo<caret>o();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/primitive.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:int
+KtType: kotlin.Int

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/typeParameters.kt

@@ -0,0 +1,8 @@
+// FILE: B.kt
+interface B: A<String> {
+    fun f<caret_onAirContext>oo(): String?
+}
+// FILE: A.java
+public interface A<T> {
+    T f<caret>oo();
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/typeParameters.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:T
+KtType: T?

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/typeParameters2.kt

@@ -0,0 +1,13 @@
+// FILE: B.kt
+class AK: A<String>() {
+    inner class BK: B<String>() {
+        override fun <K : String?> f<caret_onAirContext>oo(): K {
+        }
+    }
+}
+// FILE: A.java
+class A<T> {
+    abstract class B<S extends T> {
+        abstract <K extends S> K f<caret>oo();
+    }
+}

analysis/analysis-api/testData/components/psiTypeProvider/psiType/asKtType/typeParameters2.txt

@@ -0,0 +1,2 @@
+PsiType: PsiType:K
+KtType: K?