org.jetbrains.kotlin.util.scopeUtils.kt Maven / Gradle / Ivy

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the Kotlin compiler

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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.util.collectionUtils

import java.util.*

/**
 * Concatenates the contents of this collection with the given collection, avoiding allocations if possible.
 * Can modify `this` if it is a mutable collection.
 */
fun  Collection?.concat(collection: Collection): Collection? {
    if (collection.isEmpty()) {
        return this
    }
    if (this == null) {
        return collection
    }
    if (this is LinkedHashSet) {
        addAll(collection)
        return this
    }

    val result = LinkedHashSet(this)
    result.addAll(collection)
    return result
}

fun  concatInOrder(c1: Collection?, c2: Collection?): Collection {
    val result = if (c1 == null || c1.isEmpty())
        c2
    else if (c2 == null || c2.isEmpty())
        c1
    else {
        val result = LinkedHashSet()
        result.addAll(c1)
        result.addAll(c2)
        result
    }
    return result ?: emptySet()
}

inline fun  getFromAllScopes(scopes: List, callback: (Scope) -> Collection): Collection {
    if (scopes.isEmpty()) return emptySet()
    var result: Collection? = null
    for (scope in scopes) {
        result = result.concat(callback(scope))
    }
    return result ?: emptySet()
}

inline fun  getFirstMatch(scopes: List, callback: (Scope) -> T?): T? {
    // NOTE: This is performance-sensitive; please don't replace with map().firstOrNull()
    for (scope in scopes) {
        val result = callback(scope)
        if (result != null) return result
    }
    return null
}