1 files changed, 83 insertions, 0 deletions
diff --git a/test-utils/src/main/kotlin/com/google/devtools/ksp/processor/ErrorTypeProcessor.kt b/test-utils/src/main/kotlin/com/google/devtools/ksp/processor/ErrorTypeProcessor.kt
new file mode 100644
index 00000000..956aa16d
--- /dev/null
+++ b/test-utils/src/main/kotlin/com/google/devtools/ksp/processor/ErrorTypeProcessor.kt
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2020 Google LLC
+ * Copyright 2010-2020 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.processor
+
+import com.google.devtools.ksp.getClassDeclarationByName
+import com.google.devtools.ksp.processing.Resolver
+import com.google.devtools.ksp.symbol.KSAnnotated
+import com.google.devtools.ksp.symbol.KSPropertyDeclaration
+import com.google.devtools.ksp.symbol.KSType
+
+class ErrorTypeProcessor : AbstractTestProcessor() {
+    val result = mutableListOf<String>()
+
+    override fun toResult(): List<String> {
+        return result
+    }
+
+    override fun process(resolver: Resolver): List<KSAnnotated> {
+        val classC = resolver.getClassDeclarationByName(resolver.getKSNameFromString("C"))!!
+        val errorAtTop = classC.declarations.single { it.simpleName.asString() == "errorAtTop" }
+            as KSPropertyDeclaration
+        val errorInComponent = classC.declarations.single { it.simpleName.asString() == "errorInComponent" }
+            as KSPropertyDeclaration
+        result.add(errorAtTop.type.resolve().print() ?: "")
+        result.add(errorInComponent.type.resolve().print() ?: "")
+        errorInComponent.type.resolve().arguments.forEach { result.add(it.type!!.resolve().print()) }
+        result.add(
+            "errorInComponent is assignable from errorAtTop: ${
+            errorAtTop.type.resolve().isAssignableFrom(errorAtTop.type.resolve())
+            }"
+        )
+        result.add(
+            "errorInComponent is assignable from class C: ${
+            errorAtTop.type.resolve().isAssignableFrom(classC.asStarProjectedType())
+            }"
+        )
+        result.add(
+            "Any is assignable from errorInComponent: ${
+            resolver.builtIns.anyType.isAssignableFrom(errorAtTop.type.resolve())
+            }"
+        )
+        result.add(
+            "class C is assignable from errorInComponent: ${
+            classC.asStarProjectedType().isAssignableFrom(errorAtTop.type.resolve())
+            }"
+        )
+        result.add(
+            "Any is assignable from class C: ${
+            resolver.builtIns.anyType.isAssignableFrom(classC.asStarProjectedType())
+            }"
+        )
+        val Cls = resolver.getClassDeclarationByName("Cls")!!
+        val type = Cls.superTypes.toList()[0].resolve()
+        result.add("Cls's super type is Error type: ${type.isError}")
+        Cls.annotations.forEach {
+            val annotation = it.annotationType.resolve()
+            result.add("Cls's annotation is Error type: ${annotation.isError}")
+        }
+        return emptyList()
+    }
+
+    private fun KSType.print(): String {
+        return if (this.isError) {
+            if (this.declaration.qualifiedName == null) "ERROR TYPE" else
+                throw IllegalStateException("Error type should resolve to KSErrorTypeClassDeclaration")
+        } else this.declaration.qualifiedName!!.asString()
+    }
+}