InterfaceParser.kt
/*
* Copyright 2022 The Android Open Source Project
*
* 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 androidx.privacysandbox.tools.apicompiler.parser
import androidx.privacysandbox.tools.core.model.AnnotatedInterface
import androidx.privacysandbox.tools.core.model.Method
import androidx.privacysandbox.tools.core.model.Parameter
import androidx.privacysandbox.tools.core.model.Type
import com.google.devtools.ksp.getDeclaredFunctions
import com.google.devtools.ksp.getDeclaredProperties
import com.google.devtools.ksp.isPublic
import com.google.devtools.ksp.processing.KSPLogger
import com.google.devtools.ksp.symbol.ClassKind
import com.google.devtools.ksp.symbol.KSClassDeclaration
import com.google.devtools.ksp.symbol.KSFunctionDeclaration
import com.google.devtools.ksp.symbol.KSType
import com.google.devtools.ksp.symbol.KSValueParameter
import com.google.devtools.ksp.symbol.Modifier
import com.google.devtools.ksp.symbol.Nullability
internal class InterfaceParser(private val logger: KSPLogger) {
private val validInterfaceModifiers = setOf(Modifier.PUBLIC)
private val validMethodModifiers = setOf(Modifier.PUBLIC, Modifier.SUSPEND)
fun parseInterface(interfaceDeclaration: KSClassDeclaration): AnnotatedInterface {
check(interfaceDeclaration.classKind == ClassKind.INTERFACE) {
"${interfaceDeclaration.qualifiedName} is not an interface."
}
val name = interfaceDeclaration.qualifiedName?.getFullName()
?: interfaceDeclaration.simpleName.getFullName()
if (!interfaceDeclaration.isPublic()) {
logger.error("Error in $name: annotated interfaces should be public.")
}
if (interfaceDeclaration.getDeclaredProperties().any()) {
logger.error(
"Error in $name: annotated interfaces cannot declare properties.")
}
if (interfaceDeclaration.declarations.filterIsInstance<KSClassDeclaration>()
.any(KSClassDeclaration::isCompanionObject)
) {
logger.error(
"Error in $name: annotated interfaces cannot declare companion objects.")
}
val invalidModifiers =
interfaceDeclaration.modifiers.filterNot(validInterfaceModifiers::contains)
if (invalidModifiers.isNotEmpty()) {
logger.error(
"Error in $name: annotated interface contains invalid modifiers (${
invalidModifiers.map { it.name.lowercase() }.sorted().joinToString(limit = 3)
})."
)
}
if (interfaceDeclaration.typeParameters.isNotEmpty()) {
logger.error(
"Error in $name: annotated interfaces cannot declare type parameters (${
interfaceDeclaration.typeParameters.map { it.simpleName.getShortName() }
.sorted().joinToString(limit = 3)
})."
)
}
val methods = interfaceDeclaration.getDeclaredFunctions().map(::parseMethod).toList()
return AnnotatedInterface(
type = Converters.typeFromDeclaration(interfaceDeclaration),
methods = methods,
)
}
private fun parseMethod(method: KSFunctionDeclaration): Method {
val name = method.qualifiedName?.getFullName() ?: method.simpleName.getFullName()
if (!method.isAbstract) {
logger.error("Error in $name: method cannot have default implementation.")
}
if (method.typeParameters.isNotEmpty()) {
logger.error("Error in $name: method cannot declare type parameters (<${
method.typeParameters.joinToString(limit = 3) { it.name.getShortName() }
}>).")
}
val invalidModifiers = method.modifiers.filterNot(validMethodModifiers::contains)
if (invalidModifiers.isNotEmpty()) {
logger.error(
"Error in $name: method contains invalid modifiers (${
invalidModifiers.map { it.name.lowercase() }.sorted().joinToString(limit = 3)
})."
)
}
if (method.returnType == null) {
logger.error("Error in $name: failed to resolve return type.")
}
val returnType = parseType(method, method.returnType!!.resolve())
val parameters =
method.parameters.map { parameter -> parseParameter(method, parameter) }.toList()
return Method(
name = method.simpleName.getFullName(),
parameters = parameters,
returnType = returnType,
isSuspend = method.modifiers.contains(Modifier.SUSPEND)
)
}
private fun parseParameter(
method: KSFunctionDeclaration,
parameter: KSValueParameter
): Parameter {
val name = method.qualifiedName?.getFullName() ?: method.simpleName.getFullName()
if (parameter.hasDefault) {
logger.error(
"Error in $name: parameters cannot have default values."
)
}
return Parameter(
name = parameter.name!!.getFullName(),
type = parseType(method, parameter.type.resolve()),
)
}
private fun parseType(method: KSFunctionDeclaration, type: KSType): Type {
val name = method.qualifiedName?.getFullName() ?: method.simpleName.getFullName()
if (type.nullability == Nullability.NULLABLE) {
logger.error("Error in $name: nullable types are not supported.")
}
return Converters.typeFromDeclaration(type.declaration)
}
}