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/*
* Copyright (C) 2023 Linnea Gräf
*
* This file is part of NotEnoughUpdates.
*
* NotEnoughUpdates is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* NotEnoughUpdates is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
*/
package io.github.moulberry.notenoughupdates.autosubscribe
import com.google.devtools.ksp.getDeclaredFunctions
import com.google.devtools.ksp.getDeclaredProperties
import com.google.devtools.ksp.processing.CodeGenerator
import com.google.devtools.ksp.processing.KSPLogger
import com.google.devtools.ksp.processing.Resolver
import com.google.devtools.ksp.processing.SymbolProcessor
import com.google.devtools.ksp.symbol.ClassKind
import com.google.devtools.ksp.symbol.KSAnnotated
import com.google.devtools.ksp.symbol.KSClassDeclaration
import com.google.devtools.ksp.validate
import com.squareup.kotlinpoet.*
import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.parameterizedBy
import com.squareup.kotlinpoet.ksp.toClassName
import com.squareup.kotlinpoet.ksp.writeTo
import java.util.function.Consumer
import java.util.function.Supplier
internal class NEUAutoSymbolProcessor(val codeGenerator: CodeGenerator, val logger: KSPLogger) : SymbolProcessor {
fun collectSubscribers(elements: List<KSAnnotated>): List<NEUEventSubscriber> = buildList {
for (element in elements) {
if (element !is KSClassDeclaration) {
logger.error("@NEUAutoSubscribe is only valid on class or object declarations", element)
continue
}
if (element.typeParameters.isNotEmpty()) {
logger.error("@NEUAutoSubscribe is not valid on generic classes", element)
continue
}
val name = element.qualifiedName
if (name == null) {
logger.error("@NEUAutoSubscribe could not find name", element)
continue
}
when (element.classKind) {
ClassKind.CLASS -> {
val instanceGetter = element.getDeclaredFunctions().find {
it.simpleName.asString() == "getInstance"
}
val instanceVariable = element.getDeclaredProperties().find {
it.simpleName.asString() == "INSTANCE"
}
if (instanceGetter != null) {
val returnType = instanceGetter.returnType
if (returnType == null || !element.asStarProjectedType()
.isAssignableFrom(returnType.resolve())
) {
logger.error(
"getInstance() does not have the expected return type ${element.asStarProjectedType()}",
instanceGetter
)
continue
}
add(NEUEventSubscriber(InvocationKind.GET_INSTANCE, element))
} else if (instanceVariable != null) {
val variableType = instanceVariable.type
if (!element.asStarProjectedType().isAssignableFrom(variableType.resolve())) {
logger.error(
"INSTANCE does not have expected type ${element.asStarProjectedType()}",
instanceVariable
)
continue
}
add(NEUEventSubscriber(InvocationKind.ACCESS_INSTANCE, element))
} else {
add(NEUEventSubscriber(InvocationKind.DEFAULT_CONSTRUCTOR, element))
}
}
ClassKind.OBJECT -> {
add(NEUEventSubscriber(InvocationKind.OBJECT_INSTANCE, element))
}
else -> {
logger.error(
"@NEUAutoSubscribe is only valid on classes and objects, not on ${element.classKind}",
element
)
continue
}
}
}
}
val subscribers = mutableListOf<NEUEventSubscriber>()
override fun process(resolver: Resolver): List<KSAnnotated> {
val candidates = resolver.getSymbolsWithAnnotation(NEUAutoSubscribe::class.qualifiedName!!).toList()
val valid = candidates.filter { it.validate() }
val invalid = candidates.filter { !it.validate() }
subscribers.addAll(collectSubscribers(valid))
return invalid
}
override fun finish() {
if (subscribers.isEmpty()) return
val deps = subscribers.mapNotNull { it.declaration.containingFile }
logger.info("Dependencies: $deps")
val objectBuilder = TypeSpec.objectBuilder("AutoLoad")
FileSpec.builder("io.github.moulberry.notenoughupdates.autosubscribe", "AutoLoad")
.addFileComment("@generated by ${NEUAutoSymbolProcessor::class.simpleName}")
.addType(
objectBuilder.addFunction(
FunSpec.builder("provide")
.addParameter(
"consumer",
Consumer::class.asTypeName()
.parameterizedBy(Supplier::class.parameterizedBy(Any::class))
)
.apply {
var instanceCounter = 0
subscribers.sortedBy { it.declaration.simpleName.asString() }
.forEach { (invocationKind, declaration) ->
when (invocationKind) {
InvocationKind.GET_INSTANCE -> {
addStatement(
"consumer.accept { %T.getInstance() }",
declaration.toClassName()
)
}
InvocationKind.OBJECT_INSTANCE -> {
addStatement(
"consumer.accept { %T }",
declaration.toClassName()
)
}
InvocationKind.DEFAULT_CONSTRUCTOR -> {
val name = "instance_${instanceCounter++}"
objectBuilder.addProperty(
PropertySpec.builder(name, declaration.toClassName())
.delegate("lazy { %T() }", declaration.toClassName())
.build()
)
addStatement(
"consumer.accept { $name }",
)
}
InvocationKind.ACCESS_INSTANCE -> {
addStatement(
"consumer.accept { %T.INSTANCE }",
declaration.toClassName()
)
}
}
}
}
.build()
).build()
)
.build()
.writeTo(codeGenerator, aggregating = true, originatingKSFiles = deps)
}
}
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