1 files changed, 117 insertions, 0 deletions
diff --git a/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/impl/symbol/kotlin/KSAnnotationImpl.kt b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/impl/symbol/kotlin/KSAnnotationImpl.kt
new file mode 100644
index 00000000..6681facc
--- /dev/null
+++ b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/impl/symbol/kotlin/KSAnnotationImpl.kt
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2022 Google LLC
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ *
+ * 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.
+ */
+
+package com.google.devtools.ksp.impl.symbol.kotlin
+
+import com.google.devtools.ksp.KSObjectCache
+import com.google.devtools.ksp.processing.impl.KSNameImpl
+import com.google.devtools.ksp.symbol.*
+import org.jetbrains.kotlin.analysis.api.annotations.KtAnnotationApplication
+import org.jetbrains.kotlin.analysis.api.annotations.KtConstantAnnotationValue
+import org.jetbrains.kotlin.analysis.api.annotations.KtNamedAnnotationValue
+import org.jetbrains.kotlin.analysis.api.base.KtConstantValue
+import org.jetbrains.kotlin.analysis.api.components.KtConstantEvaluationMode
+import org.jetbrains.kotlin.analysis.api.components.buildClassType
+import org.jetbrains.kotlin.analysis.api.symbols.KtValueParameterSymbol
+import org.jetbrains.kotlin.descriptors.annotations.AnnotationUseSiteTarget.*
+import org.jetbrains.kotlin.psi.KtParameter
+
+class KSAnnotationImpl private constructor(private val annotationApplication: KtAnnotationApplication) : KSAnnotation {
+    companion object : KSObjectCache<KtAnnotationApplication, KSAnnotationImpl>() {
+        fun getCached(annotationApplication: KtAnnotationApplication) =
+            cache.getOrPut(annotationApplication) { KSAnnotationImpl(annotationApplication) }
+    }
+
+    override val annotationType: KSTypeReference by lazy {
+        analyze {
+            KSTypeReferenceImpl.getCached(buildClassType(annotationApplication.classId!!))
+        }
+    }
+
+    override val arguments: List<KSValueArgument> by lazy {
+        val presentArgs = annotationApplication.arguments.map { KSValueArgumentImpl.getCached(it) }
+        val presentNames = presentArgs.mapNotNull { it.name?.asString() }
+        val absentArgs = analyze {
+            annotationApplication.classId?.toKtClassSymbol()?.let { symbol ->
+                symbol.getMemberScope().getConstructors().singleOrNull()?.let {
+                    it.valueParameters.filter { valueParameter ->
+                        valueParameter.name.asString() !in presentNames
+                    }.mapNotNull { valueParameterSymbol ->
+                        valueParameterSymbol.getDefaultValue()?.let { constantValue ->
+                            KSValueArgumentImpl.getCached(
+                                KtNamedAnnotationValue(
+                                    valueParameterSymbol.name, KtConstantAnnotationValue(constantValue)
+                                )
+                            )
+                        }
+                    }
+                }
+            } ?: emptyList<KSValueArgument>()
+        }
+        presentArgs + absentArgs
+    }
+
+    override val defaultArguments: List<KSValueArgument>
+        get() = TODO("Not yet implemented")
+
+    override val shortName: KSName by lazy {
+        KSNameImpl.getCached(annotationApplication.classId!!.shortClassName.asString())
+    }
+
+    override val useSiteTarget: AnnotationUseSiteTarget? by lazy {
+        when (annotationApplication.useSiteTarget) {
+            null -> null
+            FILE -> AnnotationUseSiteTarget.FILE
+            PROPERTY -> AnnotationUseSiteTarget.PROPERTY
+            FIELD -> AnnotationUseSiteTarget.FIELD
+            PROPERTY_GETTER -> AnnotationUseSiteTarget.GET
+            PROPERTY_SETTER -> AnnotationUseSiteTarget.SET
+            RECEIVER -> AnnotationUseSiteTarget.RECEIVER
+            CONSTRUCTOR_PARAMETER -> AnnotationUseSiteTarget.PARAM
+            SETTER_PARAMETER -> AnnotationUseSiteTarget.SETPARAM
+            PROPERTY_DELEGATE_FIELD -> AnnotationUseSiteTarget.DELEGATE
+        }
+    }
+
+    override val origin: Origin = Origin.KOTLIN
+
+    override val location: Location by lazy {
+        annotationApplication.psi?.toLocation() ?: NonExistLocation
+    }
+
+    override val parent: KSNode?
+        get() = TODO("Not yet implemented")
+
+    override fun <D, R> accept(visitor: KSVisitor<D, R>, data: D): R {
+        return visitor.visitAnnotation(this, data)
+    }
+
+    override fun toString(): String {
+        return "@${shortName.asString()}"
+    }
+}
+
+internal fun KtValueParameterSymbol.getDefaultValue(): KtConstantValue? {
+    return this.psi?.let {
+        when (it) {
+            is KtParameter -> analyze {
+                it.defaultValue?.evaluate(KtConstantEvaluationMode.CONSTANT_EXPRESSION_EVALUATION)
+            }
+            else -> throw IllegalStateException("Unhandled default value type ${it.javaClass}")
+        }
+    }
+}