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Implement support for generic sealed classes (#152)
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23 changes: 23 additions & 0 deletions
23
compiler/src/main/kotlin/se/ansman/kotshi/MetadataAccessor.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| package se.ansman.kotshi | ||
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| import com.squareup.kotlinpoet.TypeSpec | ||
| import com.squareup.kotlinpoet.metadata.ImmutableKmClass | ||
| import com.squareup.kotlinpoet.metadata.specs.ClassInspector | ||
| import com.squareup.kotlinpoet.metadata.specs.toTypeSpec | ||
| import com.squareup.kotlinpoet.metadata.toImmutableKmClass | ||
| import javax.lang.model.element.Element | ||
|
|
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| class MetadataAccessor(private val classInspector: ClassInspector) { | ||
| private val metadataPerType = mutableMapOf<Element, ImmutableKmClass>() | ||
| private val typeSpecPerType = mutableMapOf<Element, TypeSpec>() | ||
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| fun getMetadata(type: Element): ImmutableKmClass = | ||
| metadataPerType.getOrPut(type) { | ||
| type.metadata.toImmutableKmClass() | ||
| } | ||
|
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| fun getTypeSpec(type: Element): TypeSpec = | ||
| typeSpecPerType.getOrPut(type) { | ||
| getMetadata(type).toTypeSpec(classInspector) | ||
| } | ||
| } |
84 changes: 84 additions & 0 deletions
84
compiler/src/main/kotlin/se/ansman/kotshi/SealedClassSubtype.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package se.ansman.kotshi | ||
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| import com.squareup.kotlinpoet.ClassName | ||
| import com.squareup.kotlinpoet.CodeBlock | ||
| import com.squareup.kotlinpoet.Dynamic | ||
| import com.squareup.kotlinpoet.LambdaTypeName | ||
| import com.squareup.kotlinpoet.ParameterizedTypeName | ||
| import com.squareup.kotlinpoet.TypeName | ||
| import com.squareup.kotlinpoet.TypeVariableName | ||
| import com.squareup.kotlinpoet.WildcardTypeName | ||
| import com.squareup.kotlinpoet.asClassName | ||
| import com.squareup.kotlinpoet.tag | ||
| import se.ansman.kotshi.generators.typesParameter | ||
| import java.lang.reflect.ParameterizedType | ||
| import javax.lang.model.element.TypeElement | ||
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| class SealedClassSubtype( | ||
| metadataAccessor: MetadataAccessor, | ||
| val type: TypeElement, | ||
| val label: String | ||
| ) : TypeRenderer() { | ||
| val className = type.asClassName() | ||
| val typeSpec = metadataAccessor.getTypeSpec(type) | ||
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| override fun renderTypeVariable(typeVariable: TypeVariableName): CodeBlock { | ||
| val superParameters = (typeSpec.superclass as? ParameterizedTypeName) | ||
| ?.typeArguments | ||
| ?: emptyList() | ||
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| fun TypeName.findAccessor(typesIndex: Int): CodeBlock? { | ||
| return when (this) { | ||
| is ClassName, | ||
| Dynamic, | ||
| is LambdaTypeName -> null | ||
| is WildcardTypeName -> { | ||
| for (outType in outTypes) { | ||
| outType.findAccessor(typesIndex)?.let { return it } | ||
| } | ||
| for (inType in inTypes) { | ||
| inType.findAccessor(typesIndex)?.let { return it } | ||
| } | ||
| null | ||
| } | ||
| is TypeVariableName -> { | ||
| if (name.contentEquals(typeVariable.name)) { | ||
| CodeBlock.of("") | ||
| } else { | ||
| for (bound in bounds) { | ||
| bound.findAccessor(typesIndex)?.let { return it } | ||
| } | ||
| null | ||
| } | ||
| } | ||
| is ParameterizedTypeName -> { | ||
| typeArguments.forEachIndexed { index, typeName -> | ||
| val accessor = typeName.findAccessor(typesIndex) ?: return@forEachIndexed | ||
| return CodeBlock.builder() | ||
| .addControlFlow(".let") { | ||
| add("it as? %T\n", ParameterizedType::class.java) | ||
| indent() | ||
| add("?: throw %T(%P)\n", IllegalArgumentException::class.java, "The type \${${typesParameter.name}[$typesIndex]} is not a valid type constraint for the \$this") | ||
| unindent() | ||
| } | ||
| .add(".actualTypeArguments[%L]", index) | ||
| .add(accessor) | ||
| .build() | ||
| } | ||
| null | ||
| } | ||
| } | ||
| } | ||
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| superParameters.forEachIndexed { index, superParameter -> | ||
| val accessor = superParameter.findAccessor(index) ?: return@forEachIndexed | ||
| return CodeBlock.builder() | ||
| .add("%N[%L]\n", typesParameter, index) | ||
| .indent() | ||
| .add(accessor) | ||
| .unindent() | ||
| .build() | ||
| } | ||
| throw ProcessingError("Could not determine type variable type", typeVariable.tag() ?: type) | ||
| } | ||
| } |
114 changes: 114 additions & 0 deletions
114
compiler/src/main/kotlin/se/ansman/kotshi/TypeRenderer.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* | ||
| * Copyright (C) 2018 Square, Inc. | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
|
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| package se.ansman.kotshi | ||
|
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| import com.squareup.kotlinpoet.ARRAY | ||
| import com.squareup.kotlinpoet.ClassName | ||
| import com.squareup.kotlinpoet.CodeBlock | ||
| import com.squareup.kotlinpoet.ParameterizedTypeName | ||
| import com.squareup.kotlinpoet.TypeName | ||
| import com.squareup.kotlinpoet.TypeVariableName | ||
| import com.squareup.kotlinpoet.WildcardTypeName | ||
| import com.squareup.moshi.Types | ||
|
|
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| /** | ||
| * Renders literals like `Types.newParameterizedType(List::class.java, String::class.java)`. | ||
| * Rendering is pluggable so that type variables can either be resolved or emitted as other code | ||
| * blocks. | ||
| */ | ||
| abstract class TypeRenderer { | ||
| abstract fun renderTypeVariable(typeVariable: TypeVariableName): CodeBlock | ||
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| fun render(typeName: TypeName, forceBox: Boolean = false): CodeBlock = | ||
| when { | ||
| typeName.annotations.isNotEmpty() -> render(typeName.copy(annotations = emptyList()), forceBox) | ||
| typeName.isNullable -> renderObjectType(typeName.copy(nullable = false)) | ||
| else -> when (typeName) { | ||
| is ClassName -> { | ||
| if (forceBox) { | ||
| renderObjectType(typeName) | ||
| } else { | ||
| CodeBlock.of("%T::class.java", typeName) | ||
| } | ||
| } | ||
|
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| is ParameterizedTypeName -> { | ||
| // If it's an Array type, we shortcut this to return Types.arrayOf() | ||
| if (typeName.rawType == ARRAY) { | ||
| CodeBlock.of( | ||
| "%T.arrayOf(%L)", | ||
| Types::class, | ||
| renderObjectType(typeName.typeArguments[0]) | ||
| ) | ||
| } else { | ||
| val builder = CodeBlock.builder().apply { | ||
| add("%T.", Types::class) | ||
| val enclosingClassName = typeName.rawType.enclosingClassName() | ||
| if (enclosingClassName != null) { | ||
| add("newParameterizedTypeWithOwner(%L, ", render(enclosingClassName)) | ||
| } else { | ||
| add("newParameterizedType(") | ||
| } | ||
| add("%T::class.java", typeName.rawType) | ||
| for (typeArgument in typeName.typeArguments) { | ||
| add(", %L", renderObjectType(typeArgument)) | ||
| } | ||
| add(")") | ||
| } | ||
| builder.build() | ||
| } | ||
| } | ||
|
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| is WildcardTypeName -> { | ||
| val target: TypeName | ||
| val method: String | ||
| when { | ||
| typeName.inTypes.size == 1 -> { | ||
| target = typeName.inTypes[0] | ||
| method = "supertypeOf" | ||
| } | ||
| typeName.outTypes.size == 1 -> { | ||
| target = typeName.outTypes[0] | ||
| method = "subtypeOf" | ||
| } | ||
| else -> throw IllegalArgumentException( | ||
| "Unrepresentable wildcard type. Cannot have more than one bound: $typeName" | ||
| ) | ||
| } | ||
| CodeBlock.of("%T.%L(%L)", Types::class, method, render(target, forceBox = true)) | ||
| } | ||
|
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| is TypeVariableName -> renderTypeVariable(typeName) | ||
|
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| else -> throw IllegalArgumentException("Unrepresentable type: $typeName") | ||
| } | ||
| } | ||
|
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| private fun renderObjectType(typeName: TypeName): CodeBlock = | ||
| if (typeName.isPrimitive) { | ||
| CodeBlock.of("%T::class.javaObjectType", typeName) | ||
| } else { | ||
| render(typeName) | ||
| } | ||
|
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| companion object { | ||
| operator fun invoke(renderer: (TypeVariableName) -> CodeBlock): TypeRenderer = | ||
| object : TypeRenderer() { | ||
| override fun renderTypeVariable(typeVariable: TypeVariableName): CodeBlock = renderer(typeVariable) | ||
| } | ||
| } | ||
| } |
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