JavaNonNullProcessor.kt

/*
 * 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.processor

import com.google.devtools.ksp.isConstructor
import com.google.devtools.ksp.processing.Resolver
import com.google.devtools.ksp.symbol.KSAnnotated
import com.google.devtools.ksp.symbol.KSFunctionDeclaration
import com.google.devtools.ksp.symbol.KSNode
import com.google.devtools.ksp.symbol.KSPropertyDeclaration
import com.google.devtools.ksp.symbol.KSValueParameter
import com.google.devtools.ksp.visitor.KSTopDownVisitor

class JavaNonNullProcessor : AbstractTestProcessor() {
    val results = mutableListOf<String>()

    override fun toResult(): List<String> {
        return results
    }

    override fun process(resolver: Resolver): List<KSAnnotated> {
        resolver.getNewFiles().forEach {
            it.accept(
                object : KSTopDownVisitor<Unit, Unit>() {
                    override fun defaultHandler(node: KSNode, data: Unit) {
                    }

                    override fun visitFunctionDeclaration(function: KSFunctionDeclaration, data: Unit) {
                        if (function.isConstructor()) {
                            return
                        }
                        results.add("${function.simpleName.asString()}: ${function.returnType?.resolve()?.nullability}")
                        super.visitFunctionDeclaration(function, data)
                    }

                    override fun visitPropertyDeclaration(property: KSPropertyDeclaration, data: Unit) {
                        results.add("${property.simpleName.asString()}: ${property.type.resolve().nullability}")
                    }

                    override fun visitValueParameter(valueParameter: KSValueParameter, data: Unit) {
                        results.add("${valueParameter.name?.asString()}: ${valueParameter.type.resolve().nullability}")
                    }
                },
                Unit
            )
        }
        return emptyList()
    }
}