Kotlin compiler plugin that allows class delegation to be dynamic like property delegations

Related tags

Kotlin Projects kotlin-dynamic-delegation
Overview

kotlin-dynamic-delegation

Kotlin compiler plugin that allows class delegation to be dynamic like property delegations.

The plugin is working in progress.

What does this plugin do

It provides a function

public fun <R> dynamicDelegation(value: () -> R): R =
    throw NotImplementedError("Implemented as intrinsic")

This function is implemented by the compiler. You can call this function on class delegation as follows:

interface TestClass {
    fun getResult(): Int
}
object TestObject : TestClass by (dynamicDelegation { getInstanceFromOtherPlaces() })

var called = 0
fun getInstanceFromOtherPlaces(): TestClass {
    val v = called++
    return object : TestClass {
        override fun getResult(): Int = v // static value here!
    }
}

class Test {
    @Test
    fun test() {
        assertEquals(0, TestObject.getResult())
        assertEquals(1, TestObject.getResult())
        assertEquals(2, TestObject.getResult())
    }
}

The compiler generates TestObject.getResult() as follows:

override fun getResult(): Int = getInstanceFromOtherPlaces().getResult()

So the delegated instance can be changed.

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Releases(v0.3.0-170.1)

  • v0.3.0-170.1(May 27, 2022)

  • v0.3.0-162.4(Apr 26, 2022)

  • v0.2.0-160.1(Jan 17, 2022)

    • Support dynamic delegations by property reference with receivers:
    package me.him188.kotlin.dynamic.delegation

/**
 * Creates a dynamic delegation.
 *
 * Type [T] must be the same as, or a supertype of, the class that uses `dynamicDelegation`.
 *
 * Example of usage:
 * ```
 * internal class CombinedMessage(
 *     val element: Message,
 *     val tail: Message
 * ) : MessageChain, List<SingleMessage> by dynamicDelegation(CombinedMessage::refined) {
 *     val refined: List<SingleMessage> by lazy {
 *         // lazily initialize the List<SingleMessage>
 *     }
 * }
 * ```
 */
public fun <T, R> dynamicDelegation(reference: KProperty1<T, R>): R =
    throw NotImplementedError("Implemented as intrinsic")

    This version of the compiler plugin supports Kotlin versions:

    • 1.6.0-M1
    • 1.6.0-RC
    • 1.6.0
    • 1.6.10-RC
    • 1.6.10
    Source code(tar.gz)
    Source code(zip)

  • v0.1.1-160.1(Dec 26, 2021)

  • v0.1.0-160.1(Dec 23, 2021)

Owner
Him188
Undergraduate at Imperial. Kyoani forever.
Him188
GitHub
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