org.jetbrains.jet.asJava.lightClassUtils.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2014 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.jet.asJava

import com.intellij.psi.*
import org.jetbrains.jet.lang.psi.*
import java.util.Collections
import org.jetbrains.jet.lang.psi.psiUtil.getParentByType
import java.util.ArrayList
import org.jetbrains.jet.lang.psi.psiUtil.isExtensionDeclaration
import org.jetbrains.jet.utils.addToStdlib.singletonOrEmptyList

public fun JetClassOrObject.toLightClass(): KotlinLightClass? = LightClassUtil.getPsiClass(this) as KotlinLightClass?

public fun JetDeclaration.toLightElements(): List =
        when (this) {
            is JetClassOrObject -> Collections.singletonList(LightClassUtil.getPsiClass(this))
            is JetNamedFunction -> Collections.singletonList(LightClassUtil.getLightClassMethod(this))
            is JetProperty -> LightClassUtil.getLightClassPropertyMethods(this).toList()
            is JetPropertyAccessor -> Collections.singletonList(LightClassUtil.getLightClassAccessorMethod(this))
            is JetParameter -> ArrayList().let { elements ->
                toPsiParameter()?.let { psiParameter -> elements.add(psiParameter) }
                LightClassUtil.getLightClassPropertyMethods(this).toCollection(elements)

                elements
            }
            is JetTypeParameter -> toPsiTypeParameters()
            else -> listOf()
        }

public fun PsiElement.toLightMethods(): List =
        when (this) {
            is JetNamedFunction -> LightClassUtil.getLightClassMethod(this).singletonOrEmptyList()
            is JetProperty -> LightClassUtil.getLightClassPropertyMethods(this).toList()
            is JetParameter -> LightClassUtil.getLightClassPropertyMethods(this).toList()
            is JetPropertyAccessor -> LightClassUtil.getLightClassAccessorMethod(this).singletonOrEmptyList()
            is JetClass -> Collections.singletonList(LightClassUtil.getPsiClass(this).getConstructors()[0])
            is PsiMethod -> Collections.singletonList(this)
            else -> listOf()
        }

public fun PsiElement.getRepresentativeLightMethod(): PsiMethod? =
        when (this) {
            is JetNamedFunction -> LightClassUtil.getLightClassMethod(this)
            is JetProperty -> LightClassUtil.getLightClassPropertyMethods(this).getGetter()
            is JetParameter -> LightClassUtil.getLightClassPropertyMethods(this).getGetter()
            is JetPropertyAccessor -> LightClassUtil.getLightClassAccessorMethod(this)
            is PsiMethod -> this
            else -> null
        }

public fun JetParameter.toPsiParameter(): PsiParameter? {
    val paramList = getParentByType(javaClass())
    if (paramList == null) return null

    val paramIndex = paramList.getParameters().indexOf(this)
    val owner = paramList.getParent()
    val lightParamIndex = if (owner != null && owner.isExtensionDeclaration()) paramIndex + 1 else paramIndex

    val method: PsiMethod? = when (owner) {
        is JetNamedFunction -> LightClassUtil.getLightClassMethod(owner)
        is JetPropertyAccessor -> LightClassUtil.getLightClassAccessorMethod(owner)
        is JetClass -> LightClassUtil.getPsiClass(owner)?.getConstructors()?.let { constructors ->
            if (constructors.isNotEmpty()) constructors[0] else null
        }
        else -> null
    }
    if (method == null) return null

    return method.getParameterList().getParameters()[lightParamIndex]
}

public fun JetTypeParameter.toPsiTypeParameters(): List {
    val paramList = getParentByType(javaClass())
    if (paramList == null) return listOf()

    val paramIndex = paramList.getParameters().indexOf(this)
    val jetDeclaration = paramList.getParentByType(javaClass()) ?: return listOf()
    val lightOwners = jetDeclaration.toLightElements()

    return lightOwners.map { lightOwner -> (lightOwner as PsiTypeParameterListOwner).getTypeParameters()[paramIndex] }
}

// Returns original declaration if given PsiElement is a Kotlin light element, and element itself otherwise
public val PsiElement.unwrapped: PsiElement?
    get() = if (this is KotlinLightElement<*, *>) origin else this

public val PsiElement.namedUnwrappedElement: PsiNamedElement?
    get() = unwrapped?.getParentByType(javaClass())