Reflection: add KClassifier.createType

#KT-8998 In Progress
2016-07-12 16:38:45 +03:00
parent 153e837a84
commit 1edf3c7809
8 changed files with 301 additions and 0 deletions
@@ -0,0 +1,16 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class A<T1> {
+    inner class B<T2, T3> {
+        inner class C<T4>
+    }
+}
+
+fun foo(): A<Int>.B<Double, Float>.C<Long> = null!!
+
+fun box(): String {
+    assertEquals("A<kotlin.Int>.B<kotlin.Double, kotlin.Float>.C<kotlin.Long>", ::foo.returnType.toString())
+    return "OK"
+}
@@ -0,0 +1,40 @@
+// WITH_REFLECT
+
+import kotlin.reflect.createType
+import kotlin.reflect.KTypeProjection
+import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
+
+class Foo<T>
+
+fun box(): String {
+    assertEquals(String::class.createType(), String::class.createType())
+
+    assertEquals(
+            Foo::class.createType(listOf(KTypeProjection.Star)),
+            Foo::class.createType(listOf(KTypeProjection.Star))
+    )
+
+    val i = Int::class.createType()
+    assertEquals(
+            Foo::class.createType(listOf(KTypeProjection.Invariant(i))),
+            Foo::class.createType(listOf(KTypeProjection.Invariant(i)))
+    )
+
+    assertNotEquals(
+            Foo::class.createType(listOf(KTypeProjection.In(i))),
+            Foo::class.createType(listOf(KTypeProjection.Out(i)))
+    )
+
+    assertNotEquals(
+            Foo::class.createType(listOf(KTypeProjection.Out(Any::class.createType(nullable = true)))),
+            Foo::class.createType(listOf(KTypeProjection.Star))
+    )
+
+    assertNotEquals(
+            Foo::class.createType(listOf(KTypeProjection.Star), nullable = false),
+            Foo::class.createType(listOf(KTypeProjection.Star), nullable = true)
+    )
+
+    return "OK"
+}
@@ -0,0 +1,26 @@
+// WITH_REFLECT
+
+import kotlin.reflect.createType
+import kotlin.reflect.KClass
+import kotlin.reflect.KTypeProjection
+import kotlin.test.assertEquals
+
+class A<T1> {
+    inner class B<T2, T3> {
+        inner class C<T4>
+    }
+    class D
+}
+
+fun foo(): A<Int>.B<Double, Float>.C<Long> = null!!
+
+fun box(): String {
+    fun KClass<*>.inv() = KTypeProjection.Invariant(this.createType())
+
+    val type = A.B.C::class.createType(listOf(Long::class.inv(), Double::class.inv(), Float::class.inv(), Int::class.inv()))
+    assertEquals("A<kotlin.Int>.B<kotlin.Double, kotlin.Float>.C<kotlin.Long>", type.toString())
+
+    assertEquals("A.D", A.D::class.createType().toString())
+
+    return "OK"
+}
@@ -0,0 +1,18 @@
+// WITH_REFLECT
+
+import kotlin.reflect.createType
+import kotlin.reflect.KTypeProjection
+import kotlin.test.assertEquals
+
+class Foo
+class Bar<T>
+
+fun box(): String {
+    assertEquals("Foo", Foo::class.createType().toString())
+    assertEquals("Foo?", Foo::class.createType(nullable = true).toString())
+
+    assertEquals("Bar<kotlin.String>", Bar::class.createType(listOf(KTypeProjection.Invariant(String::class.createType()))).toString())
+    assertEquals("Bar<kotlin.Int>?", Bar::class.createType(listOf(KTypeProjection.Invariant(Int::class.createType())), nullable = true).toString())
+
+    return "OK"
+}
@@ -0,0 +1,29 @@
+// WITH_REFLECT
+
+import kotlin.reflect.createType
+import kotlin.test.assertEquals
+
+class Foo<T> {
+    fun nonNull(): T = null!!
+    fun nullable(): T? = null
+}
+
+fun box(): String {
+    val tp = Foo::class.typeParameters.single()
+    assertEquals(
+            Foo::class.members.single { it.name == "nonNull" }.returnType,
+            tp.createType()
+    )
+    assertEquals(
+            Foo::class.members.single { it.name == "nullable" }.returnType,
+            tp.createType(nullable = true)
+    )
+
+    assertEquals(tp.createType(), tp.createType())
+    assertEquals(tp.createType(nullable = true), tp.createType(nullable = true))
+
+    assertEquals("T", tp.createType().toString())
+    assertEquals("T?", tp.createType(nullable = true).toString())
+
+    return "OK"
+}
@@ -0,0 +1,49 @@
+// WITH_REFLECT
+
+import kotlin.reflect.createType
+import kotlin.reflect.KClassifier
+import kotlin.reflect.KTypeProjection
+
+fun test(classifier: KClassifier, arguments: List<KTypeProjection>) {
+    try {
+        classifier.createType(arguments)
+        throw AssertionError("createType should have thrown IllegalArgumentException")
+    }
+    catch (e: IllegalArgumentException) {
+        // OK
+    }
+}
+
+class Outer<O> {
+    inner class Inner<I>
+    class Nested<N>
+}
+
+fun box(): String {
+    val p = KTypeProjection.Star
+
+    test(String::class, listOf(p))
+    test(String::class, listOf(p, p))
+    test(List::class, listOf())
+    test(List::class, listOf(p, p))
+    test(Map::class, listOf())
+    test(Map::class, listOf(p))
+    test(Map::class, listOf(p, p, p))
+    test(Array<Any>::class, listOf())
+
+    test(Outer::class, listOf())
+    test(Outer::class, listOf(p, p))
+
+    // Outer.Inner takes two arguments: first for O, second for I
+    test(Outer.Inner::class, listOf())
+    test(Outer.Inner::class, listOf(p))
+    test(Outer.Inner::class, listOf(p, p, p))
+
+    // Outer.Nested takes one argument for N
+    test(Outer.Nested::class, listOf())
+    test(Outer.Nested::class, listOf(p, p))
+
+    test(Outer::class.typeParameters.single(), listOf(p))
+
+    return "OK"
+}
@@ -12584,6 +12584,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/methodsFromAny/typeToString.kt");
                doTest(fileName);
            }
+
+            @TestMetadata("typeToStringInnerGeneric.kt")
+            public void testTypeToStringInnerGeneric() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/methodsFromAny/typeToStringInnerGeneric.kt");
+                doTest(fileName);
+            }
        }

        @TestMetadata("compiler/testData/codegen/box/reflection/multifileClasses")
@@ -13049,6 +13055,45 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/useSiteVariance.kt");
                doTest(fileName);
            }
+
+            @TestMetadata("compiler/testData/codegen/box/reflection/types/createType")
+            @TestDataPath("$PROJECT_ROOT")
+            @RunWith(JUnit3RunnerWithInners.class)
+            public static class CreateType extends AbstractBlackBoxCodegenTest {
+                public void testAllFilesPresentInCreateType() throws Exception {
+                    KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/reflection/types/createType"), Pattern.compile("^(.+)\\.kt$"), true);
+                }
+
+                @TestMetadata("equality.kt")
+                public void testEquality() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/createType/equality.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("innerGeneric.kt")
+                public void testInnerGeneric() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/createType/innerGeneric.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("simpleCreateType.kt")
+                public void testSimpleCreateType() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/createType/simpleCreateType.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("typeParameter.kt")
+                public void testTypeParameter() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/createType/typeParameter.kt");
+                    doTest(fileName);
+                }
+
+                @TestMetadata("wrongNumberOfArguments.kt")
+                public void testWrongNumberOfArguments() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/types/createType/wrongNumberOfArguments.kt");
+                    doTest(fileName);
+                }
+            }
        }
    }

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+@file:JvmName("KClassifiers")
+package kotlin.reflect
+
+import org.jetbrains.kotlin.descriptors.annotations.Annotations
+import org.jetbrains.kotlin.types.*
+import kotlin.reflect.jvm.internal.KClassImpl
+import kotlin.reflect.jvm.internal.KClassifierImpl
+import kotlin.reflect.jvm.internal.KTypeImpl
+import kotlin.reflect.jvm.internal.KTypeParameterImpl
+
+/**
+ * Creates a [KType] instance with the given classifier, type arguments, nullability and annotations.
+ * If the number of passed type arguments is not equal to the total number of type parameters of a classifier,
+ * an exception is thrown. If any of the arguments does not satisfy the bounds of the corresponding type parameter,
+ * an exception is thrown.
+ *
+ * For classifiers representing type parameters, the type argument list must always be empty.
+ * For classes, the type argument list should contain arguments for the type parameters of the class. If the class is `inner`,
+ * the list should follow with arguments for the type parameters of its outer class, and so forth until a class is
+ * not `inner`, or is declared on the top level.
+ */
+fun KClassifier.createType(
+        arguments: List<KTypeProjection> = emptyList(),
+        nullable: Boolean = false,
+        annotations: List<Annotation> = emptyList()
+): KType {
+    val descriptor = (this as? KClassifierImpl)?.descriptor
+                     ?: throw KotlinReflectionInternalError("Cannot create type for an unsupported classifier: $this (${this.javaClass})")
+
+    val typeConstructor = descriptor.typeConstructor
+    val parameters = typeConstructor.parameters
+    if (parameters.size != arguments.size) {
+        throw IllegalArgumentException("Class declares ${parameters.size} type parameters, but ${arguments.size} were provided.")
+    }
+
+    // TODO: throw exception if argument does not satisfy bounds
+
+    val typeAnnotations =
+            if (annotations.isEmpty()) Annotations.EMPTY
+            else Annotations.EMPTY // TODO: support type annotations
+
+    val kotlinType = createKotlinType(typeAnnotations, typeConstructor, arguments, nullable)
+
+    return KTypeImpl(kotlinType) {
+        TODO("Java type is not yet supported for types created with createType (classifier = $this)")
+    }
+}
+
+private fun createKotlinType(
+        typeAnnotations: Annotations, typeConstructor: TypeConstructor, arguments: List<KTypeProjection>, nullable: Boolean
+): SimpleType {
+    val parameters = typeConstructor.parameters
+    return KotlinTypeFactory.simpleType(typeAnnotations, typeConstructor, arguments.mapIndexed { index, typeProjection ->
+        val type = (typeProjection.type as KTypeImpl?)?.type
+        when (typeProjection) {
+            is KTypeProjection.Invariant -> TypeProjectionImpl(Variance.INVARIANT, type!!)
+            is KTypeProjection.In -> TypeProjectionImpl(Variance.IN_VARIANCE, type!!)
+            is KTypeProjection.Out -> TypeProjectionImpl(Variance.OUT_VARIANCE, type!!)
+            is KTypeProjection.Star -> StarProjectionImpl(parameters[index])
+        }
+    }, nullable)
+}