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package me.bush.illnamethislater
import sun.misc.Unsafe
import java.lang.reflect.Modifier
import kotlin.reflect.*
import kotlin.reflect.full.allSuperclasses
import kotlin.reflect.full.declaredMembers
import kotlin.reflect.full.isSubclassOf
import kotlin.reflect.full.isSubtypeOf
import kotlin.reflect.jvm.javaField
import kotlin.reflect.jvm.javaGetter
// author bush
// since 1.0.0
/**
* Using [KClass.members] only returns public members, and
* using [KClass.declaredMembers] doesn't return inherited
* members. This returns all members, private and inherited.
*/
internal val <T : Any> KClass<T>.allMembers
get() = (declaredMembers + allSuperclasses.flatMap { it.declaredMembers }).asSequence()
/**
* Checks if a [KCallable] is static on the jvm, and handles invocation accordingly.
*
* I am not aware of a better alternative that works with `object` classes.
*/
internal fun <R> KCallable<R>.handleCall(receiver: Any) = if (static) call() else call(receiver)
/**
* Checks if the calling [KCallable] is a static java field.
*
* Because kotlin likes to be funny, properties belonging to
* `object` classes are static, but their getters are not.
*
* If there is a getter (the property is not private),
* we will be accessing it through that, so we can stop checking.
*
* Otherwise, we check if the field is static with java reflection.
*/
internal val KCallable<*>.static
get() = if (this !is KProperty<*> || javaGetter != null) false
else javaField?.let { Modifier.isStatic(it.modifiers) } ?: false
/**
* Finds all listeners in a class. (properties and methods)
*/
@Suppress("UNCHECKED_CAST") // This cannot fail
internal inline val KClass<*>.listeners
get() = allMembers.filter { it.returnType == typeOf<Listener>() } as Sequence<KCallable<Listener>>
internal fun interface CancelledState {
fun isCancelled(event: Any): Boolean
}
private val unsafe = Unsafe::class.java.getDeclaredField("theUnsafe").let {
it.isAccessible = true
it.get(null) as Unsafe
}
private val offsetMap = hashMapOf<KClass<*>, Long>()
private val possibleNames = arrayOf("canceled", "cancelled")
private val NOT_CANCELLABLE = CancelledState { false }
internal fun cancelStateOf(type: KClass<*>) = when {
type.isSubclassOf(Event::class) -> CancelledState { (it as Event).cancelled }
else -> findCancelField(type)?.let {
offsetMap[type] = unsafe.objectFieldOffset(it.javaField)
CancelledState { event -> unsafe.getBoolean(event, offsetMap[type]!!) }
} ?: NOT_CANCELLABLE
}
private fun findCancelField(type: KClass<*>) = type.allMembers
.filter { it.name in possibleNames && it.returnType == typeOf<Boolean>() }
.filterIsInstance<KMutableProperty1<*, *>>().toList().let {
if (it.isEmpty()) null else {
if (it.size != 1) TODO() // warn
it[0]
}
}
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