org.jetbrains.kotlin.cli.common.repl.KotlinJsr223JvmInvocableScriptEngine.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2017 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.kotlin.cli.common.repl

import org.jetbrains.kotlin.utils.tryCreateCallableMapping
import java.lang.reflect.Proxy
import javax.script.Invocable
import javax.script.ScriptException
import kotlin.reflect.KClass
import kotlin.reflect.KFunction
import kotlin.reflect.KParameter
import kotlin.reflect.full.functions
import kotlin.reflect.full.safeCast

@Suppress("unused") // used externally (kotlin.script.utils)
interface KotlinJsr223JvmInvocableScriptEngine : Invocable {

    val state: IReplStageState<*> // The Invokable interface do not allow Context/Bindings substitution, so state is supplied via property

    private fun prioritizedHistory(receiverClass: KClass<*>?, receiverInstance: Any?): List {
        val evalState = state.asState(GenericReplEvaluatorState::class.java)
        return evalState.history.map { it.item }.filter { it.instance != null }.reversed().ensureNotEmpty("no script ").let { history ->
            if (receiverInstance != null) {
                val receiverKlass = receiverClass ?: receiverInstance::class
                val receiverInHistory = history.find { it.instance == receiverInstance } ?:
                                        EvalClassWithInstanceAndLoader(receiverKlass, receiverInstance, receiverKlass.java.classLoader, history.first().invokeWrapper)
                listOf(receiverInHistory) + history.filterNot { it == receiverInHistory }
            }
            else {
                history
            }
        }
    }

    override fun invokeFunction(name: String?, vararg args: Any?): Any? {
        if (name == null) throw java.lang.NullPointerException("function name cannot be null")
        return invokeImpl(prioritizedHistory(null, null), name, args)
    }

    override fun invokeMethod(thiz: Any?, name: String?, vararg args: Any?): Any? {
        if (name == null) throw java.lang.NullPointerException("method name cannot be null")
        if (thiz == null) throw IllegalArgumentException("cannot invoke method on the null object")
        return invokeImpl(prioritizedHistory(thiz::class, thiz), name, args)
    }

    private fun invokeImpl(prioritizedCallOrder: List, name: String, args: Array): Any? {
        // TODO: cache the method lookups?

        val (fn, mapping, invokeWrapper) = prioritizedCallOrder.asSequence().map { (klass, instance, _, invokeWrapper) ->
            val candidates = klass.functions.filter { it.name == name }
            candidates.findMapping(listOf(instance) + args)?.let {
                Triple(it.first, it.second, invokeWrapper)
            }
        }.filterNotNull().firstOrNull() ?: throw NoSuchMethodException("no suitable function '$name' found")

        val res = try {
            if (invokeWrapper != null) {
                invokeWrapper.invoke {
                    fn.callBy(mapping)
                }
            }
            else {
                fn.callBy(mapping)
            }
        }
        catch (e: Throwable) {
            // ignore everything in the stack trace until this constructor call
            throw ScriptException(renderReplStackTrace(e.cause!!, startFromMethodName = fn.name))
        }
        return if (fn.returnType.classifier == Unit::class) Unit else res
    }


    override fun  getInterface(clasz: Class?): T? {
        return proxyInterface(null, clasz)
    }

    override fun  getInterface(thiz: Any?, clasz: Class?): T? {
        if (thiz == null) throw IllegalArgumentException("object cannot be null")
        return proxyInterface(thiz, clasz)
    }

    private fun  proxyInterface(thiz: Any?, clasz: Class?): T? {
        if (state.history.size == 0) throw IllegalStateException("no script")
        val priority = prioritizedHistory(thiz?.javaClass?.kotlin, thiz)

        if (clasz == null) throw IllegalArgumentException("class object cannot be null")
        if (!clasz.isInterface) throw IllegalArgumentException("expecting interface")

        // TODO: cache the method lookups?

        val proxy = Proxy.newProxyInstance(Thread.currentThread().contextClassLoader, arrayOf(clasz)) { _, method, args ->
            invokeImpl(priority, method.name, args ?: emptyArray())
        }
        return clasz.kotlin.safeCast(proxy)
    }
}

private fun Iterable>.findMapping(args: List): Pair, Map>? {
    for (fn in this) {
        val mapping = tryCreateCallableMapping(fn, args)
        if (mapping != null) return fn to mapping
    }
    return null
}