/
InjectProcessor.kt
80 lines (73 loc) · 2.96 KB
/
InjectProcessor.kt
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import com.google.devtools.ksp.KspExperimental
import com.google.devtools.ksp.isAnnotationPresent
import com.google.devtools.ksp.processing.*
import com.google.devtools.ksp.symbol.*
import com.google.devtools.ksp.validate
import javax.inject.Inject
import javax.inject.Singleton
class InjectProcessorProvider : SymbolProcessorProvider {
override fun create(
environment: SymbolProcessorEnvironment
): SymbolProcessor {
return InjectProcessor(environment.codeGenerator)
}
}
class InjectProcessor(
val codeGenerator: CodeGenerator
) : SymbolProcessor {
override fun process(resolver: Resolver): List<KSAnnotated> {
val annotatedSymbols = resolver.getSymbolsWithAnnotation(Inject::class.java.name)
val unprocessedSymbols = annotatedSymbols.filter { !it.validate() }.toList()
annotatedSymbols
.filter { it is KSFunctionDeclaration && it.validate() }
.forEach { it.accept(InjectConstructorVisitor(), Unit) }
return unprocessedSymbols
}
@OptIn(KspExperimental::class)
inner class InjectConstructorVisitor : KSVisitorVoid() {
override fun visitFunctionDeclaration(
function: KSFunctionDeclaration,
data: Unit
) {
val injectedClass = function.parentDeclaration as KSClassDeclaration
val injectedClassSimpleName = injectedClass.simpleName.asString()
val packageName = injectedClass.containingFile!!.packageName.asString()
val className = "${injectedClassSimpleName}_Factory"
codeGenerator.createNewFile(
Dependencies(true, function.containingFile!!), packageName, className
).use { ktFile ->
ktFile.appendLine("package $packageName")
ktFile.appendLine()
ktFile.appendLine("import diy.Factory")
ktFile.appendLine("import diy.ObjectGraph")
if (injectedClass.isAnnotationPresent(Singleton::class)) {
ktFile.appendLine("import diy.singleton")
}
if (function.parameters.isNotEmpty()) {
ktFile.appendLine("import diy.get")
}
ktFile.appendLine()
ktFile.appendLine("class $className : Factory<$injectedClassSimpleName> {")
val constructorInvocation =
"${injectedClassSimpleName}(" + function.parameters.joinToString(", ") {
"objectGraph.get()"
} + ")"
if (injectedClass.isAnnotationPresent(Singleton::class)) {
val linkerParameter = if (function.parameters.isNotEmpty()) "objectGraph ->" else ""
ktFile.appendLine(" private val singletonFactory = singleton { $linkerParameter")
ktFile.appendLine(" $constructorInvocation")
ktFile.appendLine(" }")
ktFile.appendLine()
ktFile.appendLine(
" override fun get(objectGraph: ObjectGraph) = singletonFactory.get(objectGraph)"
)
} else {
ktFile.appendLine(
" override fun get(objectGraph: ObjectGraph) = $constructorInvocation"
)
}
ktFile.appendLine("}")
}
}
}
}