org.jetbrains.kotlin.builtins.functions.FunctionClassScope.kt Maven / Gradle / Ivy

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/*
 * Copyright 2010-2015 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.builtins.functions

import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.resolve.OverridingUtil
import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
import org.jetbrains.kotlin.resolve.scopes.JetScopeImpl
import org.jetbrains.kotlin.storage.StorageManager
import org.jetbrains.kotlin.utils.Printer
import org.jetbrains.kotlin.utils.toReadOnlyList
import java.util.ArrayList

class FunctionClassScope(
        private val storageManager: StorageManager,
        private val functionClass: FunctionClassDescriptor
) : JetScopeImpl() {
    private val allFunctions = storageManager.createLazyValue {
        if (functionClass.functionKind == FunctionClassDescriptor.Kind.Function) {
            val invoke = FunctionInvokeDescriptor.create(functionClass)
            (listOf(invoke) + createFakeOverrides(invoke)).toReadOnlyList()
        }
        else {
            createFakeOverrides(null).toReadOnlyList()
        }
    }

    override fun getContainingDeclaration() = functionClass

    override fun getDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean): Collection {
        if (!kindFilter.acceptsKinds(DescriptorKindFilter.FUNCTIONS_MASK)) return listOf()
        return allFunctions()
    }

    override fun getFunctions(name: Name): Collection {
        return allFunctions().filter { it.getName() == name }
    }

    private fun createFakeOverrides(invoke: FunctionDescriptor?): List {
        val result = ArrayList(3)
        val allSuperDescriptors = functionClass.getTypeConstructor().getSupertypes().flatMap { it.getMemberScope().getAllDescriptors() }
        for ((name, descriptors) in allSuperDescriptors.groupBy { it.getName() }) {
            @suppress("UNCHECKED_CAST")
            OverridingUtil.generateOverridesInFunctionGroup(
                    name,
                    /* membersFromSupertypes = */ descriptors as Collection,
                    /* membersFromCurrent = */ if (name == invoke?.getName()) listOf(invoke) else listOf(),
                    functionClass,
                    object : OverridingUtil.DescriptorSink {
                        override fun addToScope(fakeOverride: CallableMemberDescriptor) {
                            OverridingUtil.resolveUnknownVisibilityForMember(fakeOverride, null)
                            result.add(fakeOverride as FunctionDescriptor)
                        }

                        override fun conflict(fromSuper: CallableMemberDescriptor, fromCurrent: CallableMemberDescriptor) {
                            error("Conflict in scope of ${getContainingDeclaration()}: $fromSuper vs $fromCurrent")
                        }
                    }
            )
        }

        return result
    }

    override fun printScopeStructure(p: Printer) {
        p.println("Scope of function class $functionClass")
    }
}