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Ashley entity component system utilities for Kotlin LibGDX applications.

There is a newer version: 1.12.1-rc2

package ktx.ashley

import com.badlogic.ashley.core.Component
import com.badlogic.ashley.core.Family
import com.badlogic.ashley.core.Family.Builder
import kotlin.reflect.KClass

/**
 * @param components matches [entities][com.badlogic.ashley.core.Entity] with at least one of the specified components.
 * @return a new [Builder] for a [Family].
 */
fun oneOf(vararg components: KClass): Builder = Family.one(*toJavaClassArray(components))

/**
 * @param components matches [entities][com.badlogic.ashley.core.Entity] with all of the specified components.
 * @return a new [Builder] for a [Family].
 */
fun allOf(vararg components: KClass): Builder = Family.all(*toJavaClassArray(components))

/**
 * @param components does not match [entities][com.badlogic.ashley.core.Entity] with any of the specified components.
 * @return a new [Builder] for a [Family].
 */
fun exclude(vararg components: KClass): Builder = Family.exclude(*toJavaClassArray(components))

/**
 * @receiver the [Builder] for creating a [Family].
 * @param components matches [entities][com.badlogic.ashley.core.Entity] with at least one of the specified components.
 * @return the received [Builder] for the [Family].
 */
fun Builder.oneOf(vararg components: KClass): Builder = one(*toJavaClassArray(components))

/**
 * @receiver the [Builder] for creating a [Family].
 * @param components matches [entities][com.badlogic.ashley.core.Entity] with all of the specified components.
 * @return the received [Builder] for the [Family].
 */
fun Builder.allOf(vararg components: KClass): Builder = all(*toJavaClassArray(components))

/**
 * @receiver the [Builder] for creating a [Family].
 * @param components does not match [entities][com.badlogic.ashley.core.Entity] with any of the specified components.
 * @return the received [Builder] for the [Family].
 */
fun Builder.exclude(vararg components: KClass): Builder = exclude(*toJavaClassArray(components))

private fun toJavaClassArray(components: Array>): Array>
    = Array(components.size) { index -> components[index].java }